JournalTOCs API - articles

Shreirs Corrosion

Shreirs Corrosion

Corrosion Engineering, Science and Technology, Vol. 47, No. 1 () pp. 1 - 2
Article URL: http://www.ingentaconnect.com/content/maney/cest/2012/00000047/00000001/art00001 Citation: Vol 47 No. 1pp 1 2

Corrosion News

Corrosion News

Materials and Corrosion, Vol. , No. () pp. -
Article URL: http://dx.doi.org/10.1002%2Fmaco.201290002

Materials and Corrosion 1/2012

Materials and Corrosion 1/2012

Materials and Corrosion, Vol. , No. () pp. -
Article URL: http://dx.doi.org/10.1002%2Fmaco.201290001

Literature search: Corrosion

Mon, 08 Sep 2008 19:56:40 GMT

Literature search: Corrosion

Surface Coatings International Part B Coatings Transactions, Vol. , No. (2008) pp. -
Journal Title: Surface Coatings International Part B Coatings Transactions Journal HomePage: http://www.springerlink.com/content/120855 Journal TOC RSS feeds: http://www.springerlink.com/content/120855?sortorder=asc&export=rss printISSN: 1476-4865 journaltocID: 12973 Publisher: Springer-Verlag

Lab and field investigations on localized corrosion of casing

Lab and field investigations on localized corrosion of casing

Materials and Corrosion, Vol. , No. () pp. -
Article URL: http://dx.doi.org/10.1002%2Fmaco.201005713

Damage of stainless steel bars due to atmospheric corrosion

Damage of stainless steel bars due to atmospheric corrosion

Materials and Corrosion, Vol. , No. () pp. -
Article URL: http://dx.doi.org/10.1002%2Fmaco.201005701

Corrosion performance of epoxy coatings modified by nanoparticulate SiO2

Corrosion performance of epoxy coatings modified by nanoparticulate SiO2

Materials and Corrosion, Vol. , No. () pp. -
Article URL: http://dx.doi.org/10.1002%2Fmaco.200905620

Electrochemical noise for corrosion detection

reference-global@degruyter.com (Giampiero Montesperelli et al) — Mon, 03 Oct 2011 09:24:39 GMT

Electrochemical noise for corrosion detection
reference-global@degruyter.com (Giampiero Montesperelli et al)
Corrosion Reviews, Vol. , No. (2011) pp. -
Corrosion Reviews, Volume 0, Issue 0, Page -, Ahead of Print.

Electrochemical corrosion behaviour of innovative mould steels in a chloride‐containing environment

Electrochemical corrosion behaviour of innovative mould steels in a chloride‐containing environment

Materials and Corrosion, Vol. , No. () pp. -
Article URL: http://dx.doi.org/10.1002%2Fmaco.201005794

Effect of alternating current on corrosion and effectiveness of cathodic protection of pipelines

Fu A Q; Cheng, Y F

Effect of alternating current on corrosion and effectiveness of cathodic protection of pipelines
Fu A Q; Cheng, Y F
Canadian Metallurgical Quarterly, The, Vol. 51, No. 1 () pp. 81 - 90
Authors: Fu A Q; Cheng, Y F Article URL: http://www.ingentaconnect.com/content/maney/cmq/2012/00000051/00000001/art00010 Citation: Vol 51 No. 1pp 81 90

Influence of corrosion on the interface between zinc phosphate steel fiber and cement

Influence of corrosion on the interface between zinc phosphate steel fiber and cement

Materials and Corrosion, Vol. , No. () pp. -
Article URL: http://dx.doi.org/10.1002%2Fmaco.200905580

Symposium report - World of Corrosion 1996

Mon, 08 Sep 2008 19:56:43 GMT

Symposium report - World of Corrosion 1996

Surface Coatings International Part B Coatings Transactions, Vol. , No. (2008) pp. -
Journal Title: Surface Coatings International Part B Coatings Transactions Journal HomePage: http://www.springerlink.com/content/120855 Journal TOC RSS feeds: http://www.springerlink.com/content/120855?sortorder=asc&export=rss printISSN: 1476-4865 journaltocID: 12973 Publisher: Springer-Verlag

Study of the soil corrosion of Q235 steel ground grid in Weinan Shaanxi

Yan Aijun Hou Juanling ; Chen Yi ; Feng Lajund — Wed, 05 Oct 2011 05:42:44 GMT

Study of the soil corrosion of Q235 steel ground grid in Weinan Shaanxi
Yan Aijun Hou Juanling ; Chen Yi ; Feng Lajund
Materials Science, Vol. , No. (2011) pp. 114 - 119
For the online detection of the corrosion of ground grids, the relationship between the corrosion rate of Q235 steel and electric resistance was studied by the method of accelerated corrosion in the soil taken from the site of construction of a 750 kV high-voltage transformer station. The corrosion products and morphology are characterized by the SEM (scanning electron microscopy) and XRD (X-ray diffraction) methods. The results show that the rusty layer obtained by the accelerated corrosion has the same structure as the layer obtained by the natural corrosion and the corrosion products mainly consist of γ - Fe2O3 and FeO4. The one-year monitoring was realized and the relationship between the corrosion rate (V ) and resistivity ( R) was established. The deviation of the natural corrosion rate from the computed corrosion rate does not exceed 3%.

Foreword: Fatigue and Corrosion Damage in Metallic Materials

Tongguang Zhai Peter Liaw — Thu, 02 Feb 2012 06:55:29 GMT

Foreword: Fatigue and Corrosion Damage in Metallic Materials
Tongguang Zhai Peter Liaw
Metallurgical and Materials Transactions A, Vol. , No. (2012) pp. 1 - 1
Foreword: Fatigue and Corrosion Damage in Metallic Materials

Corrosion in Italy

reference-global@degruyter.com (Luca Magagnin et al) — Tue, 08 Nov 2011 10:33:21 GMT

Corrosion in Italy
reference-global@degruyter.com (Luca Magagnin et al)
Corrosion Reviews, Vol. , No. (2011) pp. -
Corrosion Reviews, Volume 29, Issue 5-6, Page 177, November 2011.

Representing localized corrosion processes through cellular automata

reference-global@degruyter.com (Grabriela Contreras et al) — Mon, 03 Oct 2011 09:24:35 GMT

Representing localized corrosion processes through cellular automata
reference-global@degruyter.com (Grabriela Contreras et al)
Corrosion Reviews, Vol. , No. (2011) pp. -
Corrosion Reviews, Volume 0, Issue 0, Page -, Ahead of Print.

Inhibition of localized corrosion in chromium containing stainless alloys

Tue, 13 Dec 2011 11:22:59 GMT

Inhibition of localized corrosion in chromium containing stainless alloys
reference-global@degruyter.com (Martín A. Rodríguez)
Corrosion Reviews, Vol. , No. (2011) pp. -
Corrosion Reviews, Volume 0, Issue 0, Page -, Ahead of Print.

Effect of microstructure on corrosion resistance of pipelines steels buried in alkaline soil

Souad Brick Chaouche; Azzedine Lounis; Ghania Nezzal — 2011-12-19T23:20:50-05:00

Effect of microstructure on corrosion resistance of pipelines steels buried in alkaline soil
Souad Brick Chaouche; Azzedine Lounis; Ghania Nezzal
International Journal of Microstructure and Materials Properties, Vol. 6, No. 6 (2011) pp. 526 - 542
In this work, we tried to examine the effect of microstructure of low carbon pipeline steels on their behaviour to corrosion when they are buried in alkaline soil. In this environment, the corrosion rate of these steels depends on a number of different parameters. Perhaps the most significant of these parameters, namely, is the formation, evolution and nature of the corrosion products, which are deposited on the metal surface. The laboratory experiments realised from electrochemical measurements and characterisation of corrosion products have shown that the microstructure influences the properties of the corrosion layers, such as morphology, proportion of the various chemical compounds, adherence of the film and the protective properties. The results obtained are striking, not only there was a difference in certain properties of corrosion layers, but also protective power is strongly affected.

A Theoretical Model for Metal Corrosion Degradation

A Theoretical Model for Metal Corrosion Degradation

International Journal of Corrosion, Vol. , No. () pp. -
Many aluminum and stainless steel alloys contain thin oxide layers on the metal surface which greatly reduce the corrosion rate. Pitting corrosion, a result of localized breakdown of such films, results in accelerated dissolution of the underlying metal through pits. Many researchers have studied pitting corrosion for several decades and the exact governing equation for corrosion pit degradation has not been obtained. In this study, the governing equation for corrosion degradation due to pitting corrosion behavior was derived from solid-state physics and some solutions and simulations are presented and discussed.

Investigations on susceptibility to intergranular corrosion of thermo‐mechanically rolled corrosion‐resistant materials 316L and Alloy 825

Investigations on susceptibility to intergranular corrosion of thermo‐mechanically rolled corrosion‐resistant materials 316L and Alloy 825

Materials and Corrosion, Vol. , No. () pp. -
The influence of parameters of a thermo‐mechanical rolling process on corrosion properties of materials 316L and Alloy 825 was studied by means of the DL‐EPR‐method and a conventional corrosion test. Prior to polarization measurements, optimization of the DL‐EPR‐method was conducted. SEM was used to characterize microstructure and type of attack before and after corrosion testing. A strong correlation between annual corrosion rates and DL‐EPR‐test results was obtained. Due to the low tendency of both alloys to form corrosion‐promoting precipitates, the applicable range of process parameters for both alloys is large and the fabrication process in general is not critical.

Corrosion Behaviour of Zn-10Al-1.5Cu Alloy

Corrosion Behaviour of Zn-10Al-1.5Cu Alloy

International Journal of Corrosion, Vol. , No. () pp. -
The corrosion behaviour of Zn-10Al-1.5Cu alloy in NaCl solution was examined. The used NaCl solution concentrations were 1M, 0.3M, and 0.003M for a constant temperature values of 7°C or 25°C or 45°C. The corrosion behaviour of this alloy was investigated under potentiodynamic corrosion conditions. The surface of the corroded alloy specimens was studied with the aid of scanning electron microscopy and X-ray diffraction techniques. It was observed that the increase of NaCl concentration in the corrosion solution for a constant value of temperature led to lower corrosion resistance of the alloy. For a constant value of solution concentration, the increase of solution temperature also led to the decrease of corrosion resistance of the same alloy.

Relationship between the corrosion and Cr-Ni content of stainless steel in borax bath

Junyuan Wang Hongfu Wang ; Huachang Wang ; Peng Qu — Mon, 19 Dec 2011 16:42:39 GMT

Relationship between the corrosion and Cr-Ni content of stainless steel in borax bath
Junyuan Wang Hongfu Wang ; Huachang Wang ; Peng Qu
Journal of Wuhan University of Technology-Mater. Sci. Ed., Vol. , No. (2011) pp. 1137 - 1139
Abstract The corrosion of stainless steel was experimentally investigated and analyzed to improve the service-life of the crucible and fixture clamps. Through the experiment, stainless steel was found to satisfy the crucible and fixture clamps materials. As the chromium element mass percentage of the stainless steel increased, the corrosion decreased rapidly at first and then slowly increased. With the corrosion time prolonging, the corrosion growth rate is generally a downward trend. With Chromium 20%, the corrosive were the least. With Nickel element mass percentage increased, the corrosion increased rapidly at first and then decreased rapidly, flatten at the last. It was special that the corrosion had little relationship with the Chromium and Nickel mass percentage when the Nickel percentage is more than 35%. The most remarkable corrosion is corresponding with the Nickel element 12%, the least corrosion with Nickel element 80%. So Nickel element 35% is the most optional.

Atmospheric corrosion resistance of duplex stainless steels: results of a field exposure program

C. Lojewski; P. Boillot; J. Peultier — 2011-12-01

Atmospheric corrosion resistance of duplex stainless steels: results of a field exposure program
C. Lojewski; P. Boillot; J. Peultier
Revue de Métallurgie, Vol. 108, No. (2011) pp. 191 -
Authors: C. Lojewski, P. Boillot and J. Peultier.
Revue de Métallurgie Vol. 108 , page 191
Published online: 01/12/2011
Keywords: Atmospheric corrosion ; localized corrosion ; duplex stainless steel ; austenitic stainless steel ; supermartensitic stainless steel ; ferrito-martensitic stainless steel ; architecture ; construction ; Corrosion atmosphérique ; corrosion localisée ; acier inoxydable duplex ; acier inoxydable austénitique ; acier inoxydable super martensitique ; acier inoxydable ferrito-martensitique ; architecture ; construction.

Effect of cold deformation on the properties and structure of corrosion-resistant alloy KhN30MDB

T. V. Svistunova — Sun, 09 Nov 2008 10:10:34 GMT

Effect of cold deformation on the properties and structure of corrosion-resistant alloy KhN30MDB
T. V. Svistunova
Protection of Metals, Vol. , No. (2008) pp. -
The effect of the degree of cold deformation on the structure and mechanical and corrosive properties of the corrosion-resistant alloy KhN30MDB have been studied in detail. Deformation regimes that provide for a high level of strength properties and satisfactory plasticity, combined with high corrosion resistance, including general and pitting corrosion and sulfide corrosion cracking in hydrogen sulfide, have been determined.

Prediction of corrosion rate in reinforced concrete structures – a critical review and preliminary results

Prediction of corrosion rate in reinforced concrete structures – a critical review and preliminary results

Materials and Corrosion, Vol. , No. () pp. -
This paper presents a critical review of some of the available corrosion rate prediction models focusing mainly on chloride‐induced corrosion. In addition to the proposals made for the improvement of these models, preliminary results of an ongoing study aimed at developing a chloride‐induced corrosion rate prediction model using both natural and accelerated corrosion results are presented. Even though a reasonable correlation between natural and accelerated icorr is presented here, more data are still required to ascertain the relationship.

Influence of MWCNT dispersion on corrosion behaviour of their Mg composites

Influence of MWCNT dispersion on corrosion behaviour of their Mg composites

Materials and Corrosion, Vol. , No. () pp. -
Carbon nanotubes (CNTs) have been demonstrated as good reinforcements to improve mechanical properties of magnesium alloys. This study reports on the influence of CNT dispersion on corrosion behaviour of their Mg composites. Experiments revealed that the corrosion rate is drastically increased by adding CNTs to the magnesium alloy due to galvanic coupling. Moreover, a homogeneous CNT dispersion leads to reduced corrosion resistivity. Surface pre‐treatment is also found to be critical for the corrosion performance for both 1 and 5 wt% CNT composites.

Influence of the alloying elements on crevice corrosion of stainless steels: a modeling approach

B. Malki; L. Peguet; B. Baroux — 2011-12-01

Influence of the alloying elements on crevice corrosion of stainless steels: a modeling approach
B. Malki; L. Peguet; B. Baroux
Revue de Métallurgie, Vol. 108, No. (2011) pp. 225 -
Authors: B. Malki, L. Peguet and B. Baroux.
Revue de Métallurgie Vol. 108 , page 225
Published online: 01/12/2011
Keywords: Crevice corrosion ; stainless steels ; duplex steels ; modeling ; finite elements ; Corrosion caverneuse ; aciers inoxydables ; duplex ; modélisation ; éléments-finis.

Evaluation of Corrosion Performance of Titanium/Steel Joint Brazed by Cu-Based Filler Metal

A. Elrefaey L. Wojarski ; W. Tillmann — Thu, 26 Jan 2012 06:55:16 GMT

Evaluation of Corrosion Performance of Titanium/Steel Joint Brazed by Cu-Based Filler Metal
A. Elrefaey L. Wojarski ; W. Tillmann
Journal of Materials Engineering and Performance, Vol. , No. (2012) pp. 1 - 7
Abstract Furnace vacuum brazing has been employed to join commercially pure titanium and low carbon steel using copper-based filler metal with the composition of Cu-10.6Mn-1.9Ni, at.%. Three different brazing temperatures 930, 970, and 1000 °C and a holding time of 15 min were studied and evaluated. The corrosion behavior of the joint in 0.1 M sulfuric acid was investigated using immersion and electrochemical tests. Measurements of corrosion potential, corrosion current density, corrosion rate, polarization resistance, weight loss, and morphology of corrosion attack were used in this study. Experimental results showed that severe corrosion attack of the steel side at the interfacial area is clearly observed. Despite the difference in corrosion rate values obtained by electrochemical and weight loss measurements, the trend of results was identical to a large extent. Corrosion resistance of the joint showed a general tendency to increase with rising brazing temperature. The lowest corrosion rate was obtained for the couple bonded at 1000 °C. Meanwhile, at the lowest joining temperature of 930 °C, corrosion rate showed a higher value. The results of joints corrosion resistance were attributed to the difference in microstructure features and chemical analysis.

Corrosion Properties of Light-weight and High-strength 2195 Al-Li Alloy

2011-11-11T23:03:45Z

Corrosion Properties of Light-weight and High-strength 2195 Al-Li Alloy

Chinese Journal of Aeronautics, Vol. , No. (2011) pp. -
Publication year: 2011 Source: Chinese Journal of Aeronautics, Volume 24, Issue 5, October 2011, Pages 681-686 Yue XU, Xiaojing WANG, Zhaotong YAN, Jiaxue LI The intergranular corrosion and exfoliation corrosion of 2195 Al-Li alloy treated by multi-step heating-rate controlled aging (MSRC) are studied. The corrosion features of 2195 Al-Li alloys which are respectively treated by high-temperature nucleation MSRC (H-M) and low-temperature nucleation MSRC (L-M) are contrasted. And the corrosion mechanism of 2195 Al-Li alloy is also discussed from the viewpoint of microstructure (types, distribution, etc.) of the strengthening phase. The results show that 2195 Al-Li alloy after H-M is more susceptible to intergranular corrosion and exfoliation corrosion than that of alloy after L-M. The degree of intergranular corrosion increases with the increase of predeformation amount and the surface parallel to the rolling direction is more prone to exfoliation corrosion. The main reason of intergranular corrosion and exfoliation corrosion is the formation of corrosion galvanic couples among T1 phase, θ′ phase and grain boundary precipitate-free zones (PFZ).

Atmospheric corrosion of metals in regions of cold and extremely cold climate (a review)

A. A. Mikhailov P. V. Strekalov ; Yu. M. Panchenko — Sun, 09 Nov 2008 10:10:32 GMT

Atmospheric corrosion of metals in regions of cold and extremely cold climate (a review)
A. A. Mikhailov P. V. Strekalov ; Yu. M. Panchenko
Protection of Metals, Vol. , No. (2008) pp. -
The results of atmospheric corrosion tests on a series of metals and alloys in marine and industrial atmospheres of the Earth’s regions with cold and very cold climate (Antarctic, sub-Arctic, Russian Far East) are considered. The class of most dangerous corrosive damage includes special types such as pitting, exfoliation corrosion, crevice corrosion and corrosion-induced cracking. Long-term prognosis is made concerning the influence of global warming on the atmospheric corrosion in cold climate regions.

Finite Element Analysis of Reinforced Concrete Beams with Corrosion Subjected to Shear

Finite Element Analysis of Reinforced Concrete Beams with Corrosion Subjected to Shear

Advances in Civil Engineering, Vol. , No. () pp. -
Finite element (FE) modeling techniques were developed to isolate the different contributions of corrosion damage to structural response of experimental reinforced concrete beams with shear-dominated behavior. Corrosion-damage parameters included concrete cover spalling due to the expansion of corrosion products; uniform stirrup cross-sectional loss from corrosion; localized stirrup cross-sectional loss due to pitting; debonding of corrosion-damaged stirrups from the concrete. FE analyses were performed including both individual and combined damages. The FE results matched experimental results well and quantitatively estimated capacity reduction of the experimental specimens.

Effect of Red Mud on the Corrosion of Reinforced Concrete Studied by Electrochemical Impedance Spectroscopy

Effect of Red Mud on the Corrosion of Reinforced Concrete Studied by Electrochemical Impedance Spectroscopy

ISRN Materials Science, Vol. , No. () pp. -
The corrosion of concrete reinforcement is a worldwide problem with serious consequences to humans, including accidental deaths that may occur due to the degradation of this material. Thus, techniques that can measure concrete reinforcement corrosion and provide a reliable prediction of this phenomenon are fundamental for the technological development of these materials. The corrosion of steel bars embedded in concrete containing varying amounts of red mud (up to 30% of the total binder) was tested by electrochemical impedance spectroscopy (EIS), under partial immersion in a sodium chloride solution. The addition of red mud delayed the onset of corrosion and possibly also reduced the corrosion rate.

Effect of sulphate reducing bacteria on corrosion of AlZnInSn sacrificial anodes in marine sediment

Effect of sulphate reducing bacteria on corrosion of AlZnInSn sacrificial anodes in marine sediment

Materials and Corrosion, Vol. , No. () pp. -
Microbiologically influenced corrosion (MIC) of AlZnIn‐Sn sacrificial anodes in marine sediment was investigated by exposing samples to sulphate reducing bacteria (SRB). Samples exposed to the sterile marine sediment were used as control. The results show that pitting corrosion occurs in both the sterile marine sediment and the SRB‐containing marine sediment. However, the corrosion can be increased sharply by the SRB metabolic activity due to the cathodic depolarization effect. In fact, the effect is based on the consumption of hydrogen which probably results in the acceleration of galvanic corrosion between corrosion products and metal substrate.

Focused ion beam and transmission electron microscopy as a powerful tool to understand localized corrosion phenomena

reference-global@degruyter.com (Edoardo Bemporad et al) — Mon, 03 Oct 2011 09:24:39 GMT

Focused ion beam and transmission electron microscopy as a powerful tool to understand localized corrosion phenomena
reference-global@degruyter.com (Edoardo Bemporad et al)
Corrosion Reviews, Vol. , No. (2011) pp. -
Corrosion Reviews, Volume 0, Issue 0, Page -, Ahead of Print.

Improvement of corrosion resistance of austenitic stainless steels by means of glow-discharge nitriding

reference-global@degruyter.com (Alessio Fossati et al) — Thu, 13 Oct 2011 10:45:49 GMT

Improvement of corrosion resistance of austenitic stainless steels by means of glow-discharge nitriding
reference-global@degruyter.com (Alessio Fossati et al)
Corrosion Reviews, Vol. , No. (2011) pp. -
Corrosion Reviews, Volume 0, Issue 0, Page -, Ahead of Print.

Inhibiting action of 1-phenacylmethyl-2-R-quinolinium bromides at steel acid corrosion

R. I. Yurchenko A. V. Dolina ; A. G. Yurchenko — Sat, 24 Dec 2011 16:47:05 GMT

Inhibiting action of 1-phenacylmethyl-2-R-quinolinium bromides at steel acid corrosion
R. I. Yurchenko A. V. Dolina ; A. G. Yurchenko
Russian Journal of Applied Chemistry, Vol. , No. (2011) pp. 2011 - 2012
Abstract Inhibiting action of 1-phenacetylmethyl-2-R-quinolinium bromides at acid corrosion of steel was studied.

Electrochemical techniques for the repair of reinforced concrete suffering carbonation-induced corrosion

reference-global@degruyter.com (Elena Redaelli et al) — Mon, 03 Oct 2011 09:24:38 GMT

Electrochemical techniques for the repair of reinforced concrete suffering carbonation-induced corrosion
reference-global@degruyter.com (Elena Redaelli et al)
Corrosion Reviews, Vol. , No. (2011) pp. -
Corrosion Reviews, Volume 0, Issue 0, Page -, Ahead of Print.

Use of corrosion-resistant steels and alloys in sulfuric acid media

A. S. Zholud A. S. Derbyshev ; Yu. N. Dulepov — Thu, 02 Feb 2012 17:57:56 GMT

Use of corrosion-resistant steels and alloys in sulfuric acid media
A. S. Zholud A. S. Derbyshev ; Yu. N. Dulepov
Chemical and Petroleum Engineering, Vol. , No. (2012) pp. 627 - 631
Within the chemical industry, and also in some other branches, there is extensive use of sulfuric acid solutions of different concentration and corrosiveness, containing metal ions of varied valency (Cu2+, Fe3+, Ni2+, Cr3+, etc.), which appear in a medium, for example, as a result of equipment corrosion, etc. In sulfuric acid media, corrosion can be uniform or local, i.e., pitting, spot corrosion, intercrystalline corrosion (ICC). Whereas uniform corrosion develops as a gradual reduction in the thickness of an original vessel, equipment, and machine component elements, whose corrosion rate may be calculated previously from existing data for the corrosion resistance of structural materials in specific production media, it is almost impossible to predict ICC development, and therefore in many cases it leads to sudden structural breakdown. In order to predict corrosion, it is recommended to use for article manufacture corrosion-resistant steels and alloys with alloying providing in sulfuric acid solutions resistance to uniform and local corrosion with the required heat treatment and monitoring for ICC resistance.

Experimental Investigation on Corrosion of Cast Iron Pipes

Experimental Investigation on Corrosion of Cast Iron Pipes

International Journal of Corrosion, Vol. , No. () pp. -
It is well known that corrosion is the predominant mechanism for the deterioration of cast iron pipes, leading to the reduction of pipe capacity and ultimate collapse of the pipes. In order to assess the remaining service life of corroded cast iron pipes, it is imperative to understand the mechanisms of corrosion over a long term and to develop models for pipe deterioration. Although many studies have been carried out to determine the corrosion behavior of cast iron, little research has been undertaken to understand how cast iron pipes behave over a longer time scale than hours, days, or weeks. The present paper intends to fill the gap regarding the long-term corrosion behaviour of cast iron pipes in the absence of historical data. In this paper, a comprehensive experimental program is presented in which the corrosion behaviour of three exservice pipes was thoroughly examined in three simulated service environments. It has been found in the paper that localised corrosion is the primary form of corrosion of cast iron water pipes. It has also been found that the microstructure of cast irons is a key factor that affects the corrosion behaviour of cast iron pipes. The paper concludes that long-term tests on corrosion behaviour of cast iron pipes can help develop models for corrosion-induced deterioration of the pipes for use in predicting the remaining service life of the pipes.

Efficient design of response surface experiment for corrosion prediction in CO2 environments

Asmara1 Y P; Ismail2, M C

Efficient design of response surface experiment for corrosion prediction in CO2 environments
Asmara1 Y P; Ismail2, M C
Corrosion Engineering, Science and Technology, Vol. 47, No. 1 () pp. 10 - 18
Authors: Asmara1 Y P; Ismail2, M C Article URL: http://www.ingentaconnect.com/content/maney/cest/2012/00000047/00000001/art00004 Citation: Vol 47 No. 1pp 10 18

Influence of Salt Coating on Hot Corrosion Behavior of Co-Cr Alloy

Fu Guangyan; Zhao, Xin; Liu, Qun; Su, Yong

Influence of Salt Coating on Hot Corrosion Behavior of Co-Cr Alloy
Fu Guangyan; Zhao, Xin; Liu, Qun; Su, Yong
Advanced Science Letters, Vol. 4, No. 11-12 () pp. 3633 - 3636
Authors: Fu Guangyan; Zhao, Xin; Liu, Qun; Su, Yong Article URL: http://www.ingentaconnect.com/content/asp/asl/2011/00000004/F0020011/art00056 Citation: Vol 4 No. 11-12pp 3633 3636

The co‐operative effect of chloride ions and some natural extracts in retarding corrosion of steel in neutral media

The co‐operative effect of chloride ions and some natural extracts in retarding corrosion of steel in neutral media

Materials and Corrosion, Vol. , No. () pp. -
Article URL: http://dx.doi.org/10.1002%2Fmaco.201005678

Exfoliation corrosion of Al–Zn–Mg–Cu–Zr alloy containing Sc examined by electrochemical impedance spectroscopy

Exfoliation corrosion of Al–Zn–Mg–Cu–Zr alloy containing Sc examined by electrochemical impedance spectroscopy

Materials and Corrosion, Vol. , No. () pp. -
Article URL: http://dx.doi.org/10.1002%2Fmaco.201005696

Corrosion detection using low-frequency RFID technology

Alamin M.; Tian, G.Y.; Andrews, A.; Jackson, P.

Corrosion detection using low-frequency RFID technology
Alamin M.; Tian, G.Y.; Andrews, A.; Jackson, P.
Insight - Non-Destructive Testing and Condition Monitoring, Vol. 54, No. 2 () pp. 72 - 75
Authors: Alamin M.; Tian, G.Y.; Andrews, A.; Jackson, P. Article URL: http://www.ingentaconnect.com/content/bindt/insight/2012/00000054/00000002/art00005 Citation: Vol 54 No. 2pp 72 75

An Estimate of the Market Potential for Corrosion Protection, Prevention, and Monitoring Systems in Ships

Dhiman Saurav; Datta, Biplab

An Estimate of the Market Potential for Corrosion Protection, Prevention, and Monitoring Systems in Ships
Dhiman Saurav; Datta, Biplab
Journal of Ship Production, Vol. 25, No. 4 () pp. 214 - 220
Authors: Dhiman Saurav; Datta, Biplab Article URL: http://www.ingentaconnect.com/content/sname/jsp/2009/00000025/00000004/art00006 Citation: Vol 25 No. 4pp 214 220

Improvement of corrosion performance of HVOF MMC coatings by laser surface treatment

Rakhes M; Koroleva, E; Liu, Z

Improvement of corrosion performance of HVOF MMC coatings by laser surface treatment
Rakhes M; Koroleva, E; Liu, Z
Surface Engineering, Vol. 27, No. 10 () pp. 729 - 733
Authors: Rakhes M; Koroleva, E; Liu, Z Article URL: http://www.ingentaconnect.com/content/maney/se/2011/00000027/00000010/art00003 Citation: Vol 27 No. 10pp 729 733

Cover cracking in reinforced concrete elements due to corrosion

Wed, 11 Aug 2010 07:00:00 GMT

Cover cracking in reinforced concrete elements due to corrosion

Structure and Infrastructure Engineering: Maintenance, Management, Life-Cycle Design and Performance, Vol. , No. (2010) pp. -
Structure and Infrastructure Engineering, Volume 0, Issue 0, Page 1-13, Ahead of Print.

Estimation of corrosion damages by Bayesian stochastic models

Fri, 17 Dec 2010 08:00:00 GMT

Estimation of corrosion damages by Bayesian stochastic models

Structure and Infrastructure Engineering: Maintenance, Management, Life-Cycle Design and Performance, Vol. , No. (2010) pp. -
Structure and Infrastructure Engineering, Volume 0, Issue 0, Page 1-13, Ahead of Print.

Inversion improvement of a corrosion diagnosis thanks to an inequality constraint

Wed, 19 Oct 2011 15:29:34 GMT

Inversion improvement of a corrosion diagnosis thanks to an inequality constraint

Inverse Problems in Science and Engineering, Vol. , No. (2011) pp. -
Inverse Problems in Science and Engineering, Volume 0, Issue 0, Page 1-18, Ahead of Print.

EIS study on corrosion evolution of chemical quenched rebar in concrete contaminated with chloride

Wei J; Dong, J H; Ke, W

EIS study on corrosion evolution of chemical quenched rebar in concrete contaminated with chloride
Wei J; Dong, J H; Ke, W
Corrosion Engineering, Science and Technology, Vol. 47, No. 1 () pp. 31 - 37
Authors: Wei J; Dong, J H; Ke, W Article URL: http://www.ingentaconnect.com/content/maney/cest/2012/00000047/00000001/art00007 Citation: Vol 47 No. 1pp 31 37

Corrosion of Al + 2.18% Fe alloy doped with gallium

Z. R. Obidov I. N. Ganiev ; I. T. Amonov ; N. I. Ganieva — Sat, 17 Sep 2011 05:54:17 GMT

Corrosion of Al + 2.18% Fe alloy doped with gallium
Z. R. Obidov I. N. Ganiev ; I. T. Amonov ; N. I. Ganieva
Protection of Metals and Physical Chemistry of Surfaces, Vol. , No. (2011) pp. 654 - 657
Abstract Based on the obtained results of investigations of the corrosion-electrochemical behavior and oxidation of Al + 2.18 % Fe alloy doped with gallium, it is possible to recommend this material as a corrosion-resistant structural alloy (the corrosion rate of which is 1.5–2-fold lower than that of the initial alloy) at 0.05–1.0 wt % of doping additive.

Unfolding-based corrector estimates for a reaction–diffusion system predicting concrete corrosion

Fri, 14 Oct 2011 09:58:03 GMT

Unfolding-based corrector estimates for a reaction–diffusion system predicting concrete corrosion

Applicable Analysis: An International Journal, Vol. , No. (2011) pp. -
Applicable Analysis, Volume 0, Issue 0, Page 1-26, Ahead of Print.

Corrosion electrochemical behaviors of silane coating coated magnesium alloy in NaCl solution containing cerium nitrate

Corrosion electrochemical behaviors of silane coating coated magnesium alloy in NaCl solution containing cerium nitrate

Materials and Corrosion, Vol. , No. () pp. -
Article URL: http://dx.doi.org/10.1002%2Fmaco.201005706

Machinability of duplex stainless steels long products: how to deal with the sulphur way'

N. Renaudot; E. Chauveau; M. Mantel — 2011-12-01

Machinability of duplex stainless steels long products: how to deal with the sulphur way'
N. Renaudot; E. Chauveau; M. Mantel
Revue de Métallurgie, Vol. 108, No. (2011) pp. 245 -
Authors: N. Renaudot, E. Chauveau and M. Mantel.
Revue de Métallurgie Vol. 108 , page 245
Published online: 01/12/2011
Keywords: Lean duplex ; machinability ; corrosion resistance ; toughness ; 1.4669 ; Lean duplex ; usinabilité ; résistance à la corrosion ; résilience ; 1.4669.

Comparison of fretting corrosion behaviour of Ti-6Al-4V alloy and CP-Ti in Ringers solution

Sivakumar B; Kumar, S; Narayanan, T S N Sankara

Comparison of fretting corrosion behaviour of Ti-6Al-4V alloy and CP-Ti in Ringers solution
Sivakumar B; Kumar, S; Narayanan, T S N Sankara
Tribology - Materials, Surfaces & Interfaces, Vol. 5, No. 4 () pp. 158 - 164
Authors: Sivakumar B; Kumar, S; Narayanan, T S N Sankara Article URL: http://www.ingentaconnect.com/content/maney/trb/2011/00000005/00000004/art00006 Citation: Vol 5 No. 4pp 158 164

Corrosion of N80 tubing steel in brine at 12 MPa CO2 containing trace amounts of H2S

Huang X B; Yin, Z F; Li, H L; Bai, Z Q; Zhao, W Z

Corrosion of N80 tubing steel in brine at 12 MPa CO2 containing trace amounts of H2S
Huang X B; Yin, Z F; Li, H L; Bai, Z Q; Zhao, W Z
Corrosion Engineering, Science and Technology, Vol. 47, No. 1 () pp. 78 - 83
Authors: Huang X B; Yin, Z F; Li, H L; Bai, Z Q; Zhao, W Z Article URL: http://www.ingentaconnect.com/content/maney/cest/2012/00000047/00000001/art00013 Citation: Vol 47 No. 1pp 78 83

The influence of platinum on the oxidation and sodium sulfate induced hot corrosion of NiAl diffusion coatings

Lai H.; Knutsson, P.; Stiller, K.

The influence of platinum on the oxidation and sodium sulfate induced hot corrosion of NiAl diffusion coatings
Lai H.; Knutsson, P.; Stiller, K.
Materials at High Temperatures, Vol. 28, No. 4 () pp. 302 - 308
Authors: Lai H.; Knutsson, P.; Stiller, K. Article URL: http://www.ingentaconnect.com/content/stl/maht/2011/00000028/00000004/art00009 Citation: Vol 28 No. 4pp 302 308

Corrosion of steel by carbonate‐bicarbonate solution for CO2 capture

Corrosion of steel by carbonate‐bicarbonate solution for CO2 capture

Materials and Corrosion, Vol. , No. () pp. -
Hot alkaline solutions, such as potassium/sodium carbonate solutions, have been used for carbon dioxide removal and capture processes. This survey summarizes the available corrosion data of steels in the solution with carbon dioxide dissolved. Plant operating experiences and laboratory testing results are considered. The corrosion mechanisms, important factors, inhibitor effects, and corrosion cracking are analyzed.

Corrosion of carbon steel feeders during dilute chemical decontamination of primary heat transport system of PHWRs

Corrosion of carbon steel feeders during dilute chemical decontamination of primary heat transport system of PHWRs

Materials and Corrosion, Vol. , No. () pp. -
Article URL: http://dx.doi.org/10.1002%2Fmaco.200905623

Experimental Study on Fatigue Strength of Corroded Bridge Wires

Thu, 05 Jan 2012 09:04:44 GMT

Experimental Study on Fatigue Strength of Corroded Bridge Wires

Journal of Bridge Engineering, Vol. , No. (2012) pp. -
Shunichi Nakamura and Keita Suzumura
Fatigue tests were conducted for corroded galvanized steel wires on three corrosion levels, showing that fatigue strength of corroded wires lowers as corrosion progresses. Corrosion pits were measured on the corroded specimens, showing severer corrosion produced deeper pits in more condensed areas. ... [Journal of Bridge Engineering doi:10.1061/(ASCE)BE.1943-5592.0000366] posted Thu Jan 5, 2012.

Study on Corrosion Resistance of Ni-Co-SiC Nano-Composite Coatings by High Frequency Pulse

Fri, 14 Oct 2011 13:30:36 GMT

Study on Corrosion Resistance of Ni-Co-SiC Nano-Composite Coatings by High Frequency Pulse

Integrated Ferroelectrics: An International Journal, Vol. 1, No. 127 (2011) pp. 71 - 76
Article URL: http://www.tandfonline.com/doi/abs/10.1080/10584587.2011.575647?ai=2q1&mi=3fqos0&af=R Citation: Vol 1 No. 127 (2011) pp 71 76 Publication Date: Fri, 14 Oct 2011 13:30:36 GMT

Polymer Film Selection for Corrosion Protection of Data Storage Magnetic Materials

Chatruprachewin Santi; Supadee, Laddawan; Titiroongruang, Wisut

Polymer Film Selection for Corrosion Protection of Data Storage Magnetic Materials
Chatruprachewin Santi; Supadee, Laddawan; Titiroongruang, Wisut
Journal of Nanoscience and Nanotechnology, Vol. 11, No. 12 () pp. 10579 - 10583
Authors: Chatruprachewin Santi; Supadee, Laddawan; Titiroongruang, Wisut Article URL: http://www.ingentaconnect.com/content/asp/jnn/2011/00000011/00000012/art00054 Citation: Vol 11 No. 12pp 10579 10583

Degradation of austenitic stainless steel caused by the synergic action of hydrogen and stress corrosion

Fri, 14 Oct 2011 15:17:09 GMT

Degradation of austenitic stainless steel caused by the synergic action of hydrogen and stress corrosion

Welding International, Vol. , No. (2011) pp. -
Welding International, Volume 0, Issue 0, Page 1-5, Ahead of Print.

Methodology based on potential measurement for predicting corrosion behaviour of SS 304L in boiling nitric acid containing oxidising ions

Bhise S; Kain, V

Methodology based on potential measurement for predicting corrosion behaviour of SS 304L in boiling nitric acid containing oxidising ions
Bhise S; Kain, V
Corrosion Engineering, Science and Technology, Vol. 47, No. 1 () pp. 61 - 69
Authors: Bhise S; Kain, V Article URL: http://www.ingentaconnect.com/content/maney/cest/2012/00000047/00000001/art00011 Citation: Vol 47 No. 1pp 61 69

Analysis of the Corrosion Behavior of Al Alloy Bipolar Plate for Proton Exchange Membrane Fuel Cell (PEMFC) Under Operating Thermal Conditions

Fri, 13 Jan 2012 14:44:52 GMT

Analysis of the Corrosion Behavior of Al Alloy Bipolar Plate for Proton Exchange Membrane Fuel Cell (PEMFC) Under Operating Thermal Conditions

International Journal of Green Energy, Vol. 1, No. 9 (2012) pp. 71 - 83
Article URL: http://www.tandfonline.com/doi/abs/10.1080/15435075.2011.621474?ai=zo&mi=3fqos0&af=R Citation: Vol 1 No. 9 (2012) pp 71 83 Publication Date: Fri, 13 Jan 2012 14:44:52 GMT

Corrosion effects in the structural design of metal fasteners for timber construction

Fri, 28 Jan 2011 08:00:00 GMT

Corrosion effects in the structural design of metal fasteners for timber construction

Structure and Infrastructure Engineering: Maintenance, Management, Life-Cycle Design and Performance, Vol. , No. (2011) pp. -
Structure and Infrastructure Engineering, Volume 0, Issue 0, Page 1-10, Ahead of Print.

Methods for producing welded joints in transmission pipes with the corrosion resistance similar to that of parent metal

Fri, 04 Nov 2011 16:23:25 GMT

Methods for producing welded joints in transmission pipes with the corrosion resistance similar to that of parent metal

Welding International, Vol. , No. (2011) pp. -
Welding International, Volume 0, Issue 0, Page 1-5, Ahead of Print.

Corrosion resistance of ultrasonic soldered aluminium joint using Zn-based solder alloy

Tue, 18 Oct 2011 08:08:01 GMT

Corrosion resistance of ultrasonic soldered aluminium joint using Zn-based solder alloy

Welding International, Vol. , No. (2011) pp. -
Welding International, Volume 0, Issue 0, Page 1-7, Ahead of Print.

Elsevier Corrosion Series

2009-08-17T19:04:35Z

Elsevier Corrosion Series

Corrosion Series, Vol. 1, No. (2008) pp. -
Publication year: 2008
Source: , Volume 1, 2008, Page ii
[No author name available]

Alternative methods for copper corrosion studies in household plumbing systems

Alternative methods for copper corrosion studies in household plumbing systems

Materials and Corrosion, Vol. , No. () pp. -
Copper corrosion poses a serious challenge to the practice of using copper pipes in household plumbing installations. Copper corrosion can cause health, aesthetic and economic problems. Pipe rig experiments have always been used to study copper corrosion. But the long duration of such experiments, which can last for up to six months, makes them tedious and relatively expensive, thereby limiting the progress of copper corrosion research. The purpose of this study is to establish a laboratory scale experimental setup that takes less time and can be used to study the kinetics of the processes involved in copper corrosion. The developed setup offers a promising alternative to studying copper corrosion using experiments that last for just 24 hours.

Investigation of iron long-term corrosion mechanisms in anoxic media using deuterium tracing

2012-01-25T01:11:31Z

Investigation of iron long-term corrosion mechanisms in anoxic media using deuterium tracing

Journal of Nuclear Materials, Vol. , No. (2012) pp. -
Publication year: 2012 Source: Journal of Nuclear Materials, Available online 24 January 2012 M. Saheb, P. Berger, L. Raimbault, D. Neff, P. Dillmann In the context of the nuclear waste storage and the preservation of metallic artefacts, the long-term corrosion of iron is studied. In an anoxic medium, the cathodic process involves the reduction of water into gaseous hydrogen and hydrogen-containing species that can precipitate with iron. Consequently, to understand the corrosion mechanisms, isotopic deuterium tracing (D2O) has been performed on archaeological artefacts to locate the precipitation zones in the corrosion layer. The presence of deuterium in the metallic matrix of the sample indicates that gaseous hydrogen has been formed and is a clue of the water reduction reaction. Moreover, the precipitation zones in the corrosion layer have been identified on its internal part. This is caused by the iron source location on this part of the corrosion layer. Deuterium concentration quantification made it possible to evaluate an instantaneous corrosion rate below 2 μm/year. Highlights► Corrosion mechanisms in anoxic carbonated media. ► Isotopic deuterium tracing. ► Determination of the precipitation zones in a thick corrosion layer. ► Estimation of the corrosion rate.

Electrochemical corrosion behavior of arc sprayed Zn and Zn15Al coatings in simulated salina soil and neutral meadow soil solutions

Bilan Lin Xinying Lu ; Long Li — Mon, 19 Dec 2011 16:42:22 GMT

Electrochemical corrosion behavior of arc sprayed Zn and Zn15Al coatings in simulated salina soil and neutral meadow soil solutions
Bilan Lin Xinying Lu ; Long Li
Journal of Wuhan University of Technology-Mater. Sci. Ed., Vol. , No. (2011) pp. 1152 - 1156
Abstract Arc sprayed Zn and Zn15Al coatings were chosen to protect the metal ends of prestressed high-strength concrete (PHC) pipe piles against corrosion of salina soil in northern china and neutral meadow soil in northeast China. The corrosion behavior of the coated Q235 steel samples in two simulated soil solutions were investigated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) methods. The experimental results show that the corrosion of the matrix Q235 steel in both simulated solutions is remarkably inhibited by Zn and Zn15Al coatings. The corrosion products on Zn and Zn15Al are thick, compact, firm and protective. The corrosion current density i corr of both Zn and Zn15Al-coated samples is decreased evidently with corrosion time, and the charge transfer resistance R ct is increased greatly. The corrosion resistance indexes of Zn and Zn15Al in simulated neutral meadow soil solution are more outstanding than those in salina soil. The corrosion resistance of Zn15Al in salina soil is slightly superior to that of Zn. When the sprayed coatings are sealed with epoxy resin, the corrosion resistance of the coatings is further enhanced markedly.

Electrochemical corrosion behavior of arc sprayed Zn and Zn15Al coatings in simulated salina soil and neutral meadow soil solutions

Bilan Lin Xinying Lu ; Long Li — Mon, 19 Dec 2011 16:42:22 GMT

Electrochemical corrosion behavior of arc sprayed Zn and Zn15Al coatings in simulated salina soil and neutral meadow soil solutions
Bilan Lin Xinying Lu ; Long Li
Journal of Wuhan University of Technology--Materials Science Edition, Vol. , No. (2011) pp. 1152 - 1156
Abstract Arc sprayed Zn and Zn15Al coatings were chosen to protect the metal ends of prestressed high-strength concrete (PHC) pipe piles against corrosion of salina soil in northern china and neutral meadow soil in northeast China. The corrosion behavior of the coated Q235 steel samples in two simulated soil solutions were investigated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) methods. The experimental results show that the corrosion of the matrix Q235 steel in both simulated solutions is remarkably inhibited by Zn and Zn15Al coatings. The corrosion products on Zn and Zn15Al are thick, compact, firm and protective. The corrosion current density i corr of both Zn and Zn15Al-coated samples is decreased evidently with corrosion time, and the charge transfer resistance R ct is increased greatly. The corrosion resistance indexes of Zn and Zn15Al in simulated neutral meadow soil solution are more outstanding than those in salina soil. The corrosion resistance of Zn15Al in salina soil is slightly superior to that of Zn. When the sprayed coatings are sealed with epoxy resin, the corrosion resistance of the coatings is further enhanced markedly.

Corrosion behavior of carbon steel in the presence of two novel iron-oxidizing bacteria isolated from sewage treatment plants

H. Ashassi-Sorkhabi M. Moradi-Haghighi ; G. Zarrini ; R. Javaherdashti — Tue, 21 Jun 2011 20:56:08 GMT

Corrosion behavior of carbon steel in the presence of two novel iron-oxidizing bacteria isolated from sewage treatment plants
H. Ashassi-Sorkhabi M. Moradi-Haghighi ; G. Zarrini ; R. Javaherdashti
Biodegradation, Vol. , No. (2011) pp. 1 - 11
Abstract In this work, two novel iron oxidizing bacteria (IOB), namely Gordonia sp. MZ-89 and Enterobacter sp. M01101, were isolated from sewage treatment plants and identified by biochemical and molecular methods. Then, microbially influenced corrosion (MIC) of carbon steel in the presence of these bacteria was investigated. The electrochemical techniques such as potentiodynamic polarization measurements and electrochemical impedance spectroscopy (EIS) were used to measure the corrosion rate and observe the corrosion mechanism. The results showed that the existence of these microorganisms decreased the corrosion potential and enhanced the corrosion rate. Scanning electron microscopy (SEM) images revealed the ground boundary attacks and pitting on carbon steel samples in the presence of these bacteria after polarization. Corrosion scales were identified with X-ray diffraction (XRD). It was demonstrated that these bacteria can greatly affect the crystalline phase of corrosion products that also confirmed by SEM results. It was inferred that these bacteria were responsible for the corrosion of carbon steel, especially in the form of localized corrosion.

Anti corrosive electroless Ni-P films for mild steel materials

Venkatesha T V S Ranganatha — 2012-03-17 00:00:00.0

Anti corrosive electroless Ni-P films for mild steel materials
Venkatesha T V S Ranganatha
Anti-Corrosion Methods and Materials, Vol. , No. (2012) pp. -
Abstract

Purpose - The purpose of this paper is to evaluate the corrosion resistance of the electroless Ni-P coatings in two aggressive media 3.5 wt. % NaCl and Synthetic industrial waste water. Also to study the effect of Phosphorous content in the electroless Ni-P deposits on its surface nature, morphology and corrosion resistance. Design/methodology/approach - The corrosion behavior of electroless Ni-P coatings generated on mild steel coupons from an acidic and an alkaline baths and their anti corrosion performance of was compared systematically in 3.5 wt% of NaCl solution and also in synthetic industrial waste water. Microstructure and surface composition of coatings were analyzed using X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy techniques respectively. The Ni-P coated mild steel specimens were subjected to corrosion and the rate of corrosion was studied by chemical and electrochemical methods. The linear sweep voltammetry, Tafel and electrochemical impedance spectroscopy were employed to get corrosion data.Findings - The electroless Ni-P coatings with higher P content possess homogeneous, uniform and amorphous surface nature and exhibited higher corrosion resistance in the aggressive corrosive media chosen. Originality/value - This paper provides corrosion behavior of electroless Ni-P coatings in 3.5 wt. % NaCl and synthetic industrial waste water, and establishes the importance of phosphorous content on nature and properties of the coatings.

Lean duplex stainless steels – The role of molybdenum addition on pitting corrosion of concrete reinforcements

T. Mesquita; E. Chauveau; M. Mantel; N. Kinsman; R.P. Nogueira — 2011-12-01

Lean duplex stainless steels – The role of molybdenum addition on pitting corrosion of concrete reinforcements
T. Mesquita; E. Chauveau; M. Mantel; N. Kinsman; R.P. Nogueira
Revue de Métallurgie, Vol. 108, No. (2011) pp. 203 -
Authors: T. Mesquita, E. Chauveau, M. Mantel, N. Kinsman and R.P. Nogueira.
Revue de Métallurgie Vol. 108 , page 203
Published online: 01/12/2011
Keywords: Duplex stainless steels ; molybdenum ; pitting corrosion ; concrete reinforcement ; Aciers inoxydables duplex ; molybdène ; corrosion par piqûre ; renfort du béton.

Localized corrosion resistance of duplex stainless steels: methodology and properties; a review paper

L. Peguet; A. Gaugain — 2011-12-01

Localized corrosion resistance of duplex stainless steels: methodology and properties; a review paper
L. Peguet; A. Gaugain
Revue de Métallurgie, Vol. 108, No. (2011) pp. 231 -
Authors: L. Peguet and A. Gaugain.
Revue de Métallurgie Vol. 108 , page 231
Published online: 01/12/2011
Keywords: Duplex stainless steels ; corrosion ; electrochemical characterization ; pitting potential ; critical pitting temperature ; Aciers inoxydables duplex ; corrosion ; caractérisation électrochimique ; potentiel de piqûre ; température critique de piqûre.

Corrosion behavior of SRB Desulfobulbus propionicus isolated from an Indian petroleum refinery on mild steel

Corrosion behavior of SRB Desulfobulbus propionicus isolated from an Indian petroleum refinery on mild steel

Materials and Corrosion, Vol. , No. () pp. -
In this study, Desulfobulbus propionicus (D. propionicus), a sulfate reducing bacterium (SRB) was isolated and identified in cooling towers by molecular biologic techniques. This bacterial species has been reported for the first time in the cooling towers of an Indian petroleum refinery. Corrosion behaviors were analyzed by electrochemical and weight loss methods. The high corrosion rate and the enhancement of anodic current in increased chloride environment was noticed in the presence of D. propionicus indicating that this SRB species enhances the pitting corrosion of mild steel. Propionate metabolism in H2S production is discussed as a new pathway of corrosion enhancement.

A Study on the Mechanical and Corrosion Properties of Lead Added Magnesium Alloys

2012-01-25T01:41:28Z

A Study on the Mechanical and Corrosion Properties of Lead Added Magnesium Alloys

Materials & Design, Vol. , No. (2012) pp. -
Publication year: 2012 Source: Materials & Design, Available online 24 January 2012 Bünyamin Cicek, Yavuz Sun The purpose of this study was to investigate the effect adding Pb at different ratios had on the corrosion properties of Mg alloys. Pb, at a rate of 0.2%, 0.5%, and 1%, was added to -10% Al-12Si. The microstructure characterisation, mechanical and corrosion properties of alloys, produced using a casting method was investigated. Light Optical Microscopy (LOM), X-Ray Diffraction (XRD) analyses and a Scanning Electron Microscope (SEM) were used to conduct the microstructure characterisation of investigated alloys. Corrosion tests were performed by suspending the samples of certain sizes into the 3.5% NaCl solutions measuring the weight loss, and also by potentiodynamic polarization measurements in the same solution. According to corrosion experiment results, Ikordecreased with the addition of Pb, causing an increase in the corrosion resistance. Highlights► Mg is the lightest metal used in structural applications. ► The most important disadvantages of Mg alloys are their low strength and corrosion resistance. ► Different ratios of Pb were added to alloys reinforced with Mg2Si particles. ► According to corrosion tests, corrosion resistance increased with the addition of Pb.

Corrosion of aluminium, stainless steels and AISI 680 nickel alloy in nitrogen‐based fuels

Corrosion of aluminium, stainless steels and AISI 680 nickel alloy in nitrogen‐based fuels

Materials and Corrosion, Vol. , No. () pp. -
Nitrogen‐based compounds can potentially be used as alternative non‐carbon or low‐carbon fuels. Nevertheless, the corrosion of construction materials at high temperatures and pressures in the presence of such fuel has not been reported yet. This work is focused on the corrosion of AISI Al 6061, 1005 carbon steel (CS), 304, 316L, 310 austenitic stainless steels (SS) and 680 nickel alloy in highly concentrated water solution of ammonium nitrate and urea (ANU). The corrosion at 50 °C and ambient pressure and at 350 °C and 20 bar was investigated to simulate storage and working conditions. Sodium chloride was added to the fuel (0–5 wt%) to simulate industrial fertilizers and accelerated corrosion environment. Heavy corrosion of CS was observed in ANU solution at 50 °C, while Al 6061, 304 and 316L SS showed high resistance both to uniform and pitting corrosion in ANU containing 1% of sodium chloride. Addition of 5% sodium chloride caused pitting of Al 6061 but had no influence on the corrosion of SS. Tests in ANU at 350 °C and 20 bar showed pitting on SS 304 and 316L and 680 nickel alloy. The highest corrosion resistance was found for SS 310 due to formation of stable oxide film on its surface.

In situ corrosion analysis of Al-Zn-In-Mg-Ti-Ce sacrificial anode alloy

2012-01-11T02:56:22Z

In situ corrosion analysis of Al-Zn-In-Mg-Ti-Ce sacrificial anode alloy

Materials Characterization, Vol. , No. (2012) pp. -
Publication year: 2012 Source: Materials Characterization, Available online 9 January 2012 Jingling Ma, Jiuba Wen, Wenxia Zhai, Quanan Li The corrosion behaviour of Al-5Zn-0.02In-1 Mg-0.05Ti-0.5Ce (wt. %) alloy has been investigated by immersion test, scanning electron microscopy, energy dispersive X-ray detector, electrochemical impedance spectroscopy and electrochemical noise. The results show that there exist different corrosion types of the alloy in 3.5% NaCl solution with the immersion time. At the initial stage of immersion, pitting due to the precipitates predominates the corrosion with a typical inductive loop at low frequencies in electrochemical impedance spectroscopy. The major precipitates of the alloy are MgZn2and Al2CeZn2particles. The corrosion potentials of the bulk MgZn2and Al2CeZn2alloys are negative with respect to that of α-Al, so the MgZn2and Al2CeZn2precipitates can act as activation centre and cause the pitting. In the late corrosion, a relative uniform corrosion predominates the corrosion process controlled by the dissolution/precipitation of the In ions and characterized by a capacitive loop at medium-high frequencies in electrochemical impedance spectroscopy. The potential noise of the pitting shows larger amplitude fluctuation and lower frequency, but the potential noise of the uniform corrosion occurs with smaller amplitude fluctuation and higher frequency.

Durability of asphalt mixture in different corrosion solution

Shuanfa Chen Bowen Guan ; Rui Xiong ; Yanping Sheng ; Rui He — Mon, 19 Dec 2011 16:42:40 GMT

Durability of asphalt mixture in different corrosion solution
Shuanfa Chen Bowen Guan ; Rui Xiong ; Yanping Sheng ; Rui He
Journal of Wuhan University of Technology-Mater. Sci. Ed., Vol. , No. (2011) pp. 1200 - 1204
Abstract The corrosion to asphalt mixture under different kinds of corrosion solution, such as pH=2 solution, pH=12 solution, pH = 12 solution and 10% Na2SO4 solution, was studied. The performance attenuation of asphalt mixture was analyzed under the normal environment and the freeze-thaw environment, and the analysis was given on the sensitivity of the test results to the evaluation index. The experimental results show that the performance of asphalt mixture is attenuated faster under the acidic solution, alkaline solution and sulfate solution. Corrosion factor K c, freeze-thaw corrosion factor K f, and freeze-thaw effect factor K fc are proposed to evaluate asphalt mixture resistance to corrosion in different kinds of corrosion solution. The values of K c and K fc decrease with the increasing of corrosion time. The change rule of K f show that the rate of corrosion is decreased by the action of freeze-thaw in acidic solution and in alkaline solution, but is increased by the action of freeze-thaw in sulfate solution. The microscopic analysis indicates that acid solution reacts with aggregate of asphalt mixture, alkaline solution reacts with asphalt cement of asphalt mixture, the surface tension of sulfate solution and crystallization of sulfate are the main reasons which weak the performance of asphalt mixture.

Durability of asphalt mixture in different corrosion solution

Shuanfa Chen Bowen Guan ; Rui Xiong ; Yanping Sheng ; Rui He — Mon, 19 Dec 2011 16:42:40 GMT

Durability of asphalt mixture in different corrosion solution
Shuanfa Chen Bowen Guan ; Rui Xiong ; Yanping Sheng ; Rui He
Journal of Wuhan University of Technology--Materials Science Edition, Vol. , No. (2011) pp. 1200 - 1204
Abstract The corrosion to asphalt mixture under different kinds of corrosion solution, such as pH=2 solution, pH=12 solution, pH = 12 solution and 10% Na2SO4 solution, was studied. The performance attenuation of asphalt mixture was analyzed under the normal environment and the freeze-thaw environment, and the analysis was given on the sensitivity of the test results to the evaluation index. The experimental results show that the performance of asphalt mixture is attenuated faster under the acidic solution, alkaline solution and sulfate solution. Corrosion factor K c, freeze-thaw corrosion factor K f, and freeze-thaw effect factor K fc are proposed to evaluate asphalt mixture resistance to corrosion in different kinds of corrosion solution. The values of K c and K fc decrease with the increasing of corrosion time. The change rule of K f show that the rate of corrosion is decreased by the action of freeze-thaw in acidic solution and in alkaline solution, but is increased by the action of freeze-thaw in sulfate solution. The microscopic analysis indicates that acid solution reacts with aggregate of asphalt mixture, alkaline solution reacts with asphalt cement of asphalt mixture, the surface tension of sulfate solution and crystallization of sulfate are the main reasons which weak the performance of asphalt mixture.

Influence of microstructure on mechanical properties and corrosion behavior of 3%Cr steel in CO2 environment

Influence of microstructure on mechanical properties and corrosion behavior of 3%Cr steel in CO2 environment

Materials and Corrosion, Vol. , No. () pp. -
Corrosion behavior and mechanical properties of two 3%Cr pipeline steels were studied which have same chemical compositions but different microstructures, bainite‐ferrite and ferrite‐pearlite microstructures. Analysis of chemical compositions and surface morphology of the corrosion scale were performed using X‐ray diffraction and scanning electron microscopy in conjunction with energy dispersive X‐ray spectroscopy. The semi‐passive character of corrosion scale was investigated using polarization curves measurements. The influence of microstructure on the chromium enrichment in the corrosion scale for different test periods was investigated. The microstructure was observed to affect the corrosion behavior even when the steel surface has been covered with corrosion scales and continue to have an effect until the corrosion scale possessing semi‐passive character. Possessing both good strength and corrosion resistance, 3%Cr steel with bainite‐ferrite microstructure was very promising for pipeline steel applications.

Corrosion and self‐healing behaviour of AZ91D magnesium alloy in ethylene glycol/water solutions

Corrosion and self‐healing behaviour of AZ91D magnesium alloy in ethylene glycol/water solutions

Materials and Corrosion, Vol. , No. () pp. -
Corrosion behaviour of magnesium alloy‐based engine parts in cooling system is an urgent fundamental issue in automotive field where magnesium alloys are increasingly used. In the present work, the corrosion behaviour of AZ91D magnesium alloys in various ethylene glycol/water solutions was studied by electrochemical measurements and immersion tests at room temperature. The surfaces of the samples after immersion tests were examined using scanning electron microscope (SEM) and X‐ray diffraction (XRD). The results showed that the corrosion rates of AZ91D magnesium alloys decreased with the increase of ethylene glycol concentration in ethylene glycol/water solutions and the corrosion process was dominated by pitting corrosion. A continuous protective film transferred from corrosion products was formed on the corroded surface after sufficient immersion duration in ethylene glycol/water solutions, which is able to heal the corrosion pits. The self‐healing behaviour inhibited the further corrosion of AZ91D magnesium alloy.

Non‐destructive detection of corrosion applied to steel and galvanized steel coated with organic paints by the pulsed phase thermography

Non‐destructive detection of corrosion applied to steel and galvanized steel coated with organic paints by the pulsed phase thermography

Materials and Corrosion, Vol. , No. () pp. -
Organic coatings in the automobile industry have to resist corrosion and mechanical damage from stone chipping. Currently, no tool is established in industrial non‐destructive applications for analyzing the damage of stone‐impacts and the following corrosion after accelerated corrosion tests. Measurement methods such as the scanning Kelvin probe can analyze the corrosion progress in a detailed manner, but with a long measurement time. The pulsed phase thermography (PPT) is a non‐destructive tool to analyze inhomogeneities and defects in materials, with a huge field of applications existing. The present work shows advances in using the PPT to detect propagation of corrosion under coatings. Physical principles of the mechanism of the corrosion detection under coatings are described. Results of measurements of organic coatings on carbon steel as well as of organic coated galvanized steel show the corrosion propagation. Influencing factors to the measurement such as the thickness of the coatings are investigated, but no significant effect on the quality of the analysis was found. The corrosion progress can be monitored by the PPT fast and reliably. The achieved results correlate with the theoretical basis and the test results after surface characterization and destructive analysis of samples.

Shot noise analysis on corrosion behavior of zinc alloy (ZnAl4Cu1) under dry-wet cycles

2012-01-27T22:09:37Z

Shot noise analysis on corrosion behavior of zinc alloy (ZnAl4Cu1) under dry-wet cycles

Transactions of Nonferrous Metals Society of China, Vol. , No. (2012) pp. -
Publication year: 2012 Source: Transactions of Nonferrous Metals Society of China, Volume 22, Issue 1, January 2012, Pages 228-240 An-na CHEN, Fa-he CAO, Wen-juan LIU, Li-yun ZHENG, Zhao ZHANG, ... The corrosion behaviors of zinc alloy (ZnAl4Cu1) in 3.5% (mass fraction) NaCl, 7.3% (mass fraction) Na2SO4and simulated acid rain solutions were investigated using electrochemical measurements. The potential noise during dry-wet cycle was monitored and analyzed by fast Fourier transform (FFT), fast wavelet transform (FWT), shot noise theory and stochastic theory. Cumulative probability curves of event frequencyfnindicate that the corrosion events in the dry cycles are greater than those in the wet cycles. Uniform corrosion was observed in the NaCl solution compared with more localized corrosion in the Na2SO4solution, which is evidenced by FWT and SEM. Conditional events generation rater(t) for diffusion controlled reactions decreases with increasing the time.r(t) values for uniform corrosion and diffusion controlled process are the largest in the wet cycle in 3.5% NaCl solution. The values ofr(t) for pitting corrosion in Na2SO4solution are observed to become large during spraying periods, andr(t) for pitting corrosion has the largest value in the Na2SO4solution. The intergranular corrosion of zinc is serious in simulated acid rain solution.

Relationship between the corrosion and Cr-Ni content of stainless steel in borax bath

Junyuan Wang Hongfu Wang ; Huachang Wang ; Peng Qu — Mon, 19 Dec 2011 16:42:39 GMT

Relationship between the corrosion and Cr-Ni content of stainless steel in borax bath
Junyuan Wang Hongfu Wang ; Huachang Wang ; Peng Qu
Journal of Wuhan University of Technology--Materials Science Edition, Vol. , No. (2011) pp. 1137 - 1139
Abstract The corrosion of stainless steel was experimentally investigated and analyzed to improve the service-life of the crucible and fixture clamps. Through the experiment, stainless steel was found to satisfy the crucible and fixture clamps materials. As the chromium element mass percentage of the stainless steel increased, the corrosion decreased rapidly at first and then slowly increased. With the corrosion time prolonging, the corrosion growth rate is generally a downward trend. With Chromium 20%, the corrosive were the least. With Nickel element mass percentage increased, the corrosion increased rapidly at first and then decreased rapidly, flatten at the last. It was special that the corrosion had little relationship with the Chromium and Nickel mass percentage when the Nickel percentage is more than 35%. The most remarkable corrosion is corresponding with the Nickel element 12%, the least corrosion with Nickel element 80%. So Nickel element 35% is the most optional.

Effects of Variations in Salt-Spray Conditions on the Corrosion Mechanisms of an AE44 Magnesium Alloy

Effects of Variations in Salt-Spray Conditions on the Corrosion Mechanisms of an AE44 Magnesium Alloy

International Journal of Corrosion, Vol. , No. () pp. -
The understanding of how corrosion affects magnesium alloys is of utmost importance as the automotive and aerospace industries have become interested in the use of these lightweight alloys. However, the standardized salt-spray test does not produce adequate corrosion results when compared with field data, due to the lack of multiple exposure environments. This research explored four test combinations through three sets of cycles to determine how the corrosion mechanisms of pitting, intergranular corrosion, and general corrosion were affected by the environment. Of the four test combinations, Humidity-Drying was the least corrosive, while the most corrosive test condition was Salt Spray-Humidity-Drying. The differences in corrosivity of the test conditions are due to the various reactions needed to cause corrosion, including the presence of chloride ions to cause pit nucleation, the presence of humidity to cause galvanic corrosion, and the drying phase which trapped chloride ions beneath the corrosion by-products.

Acoustic emission monitoring of micro cell corrosion testing in type 304 stainless steels

Fri, 18 Nov 2011 16:47:44 GMT

Acoustic emission monitoring of micro cell corrosion testing in type 304 stainless steels

Strength, Fracture and Complexity, Vol. , No. (2011) pp. -

A new method of acoustic emission (AE) monitoring was proposed to study the corrosion and stress corrosion cracking (SCC) by chloride ion. It is a combination of the small chloride droplet corrosion, SCC testing method and AE waveform measurement system with a high sensitivity AE sensor, all of which have been developed by our group. Three types of corrosion were observed in the corrosion testing, which were the open pitting, the covered pitting and snake-like corrosion, respectively. There were many AE events in the covered pitting and snake-like corrosion. On the contrary, there was no AE event in the open pitting. Meanwhile, the cross section of the snake-like corrosion was analyzed by EBSD. It shows that under the corrosion surface, there were some cracks at the {111} interface of Σ3 coincidence boundary and annealing twins. Based on these experiment results, it indicated that the microstructure generated by the covered pitting and snake-like corrosion during corrosion is the initiation site of stress corrosion cracking. Besides, the micro cell corrosion and SCC testing in thin plate specimens of SUS304 stainless steel by the AE monitoring were effective for evaluation of the progression process of them.

Content Type Journal Article
Pages 71-78
DOI 10.3233/SFC-2011-0125
Authors
- Mitsuharu Shiwa, National Institute for Materials Science, Ibaraki, Japan
- Hiroyuki Masuda, National Institute for Materials Science, Ibaraki, Japan
- Hisasi Yamawaki, National Institute for Materials Science, Ibaraki, Japan
- Kaita Ito, Department of Materials Engineering, School of Engineering, The University of Tokyo, Tokyo, Japan
- Manabu Enoki, Department of Materials Engineering, School of Engineering, The University of Tokyo, Tokyo, Japan

Journal Strength, Fracture and Complexity
Online ISSN 1875-9262
Print ISSN 1567-2069

Journal Volume Volume 7

Journal Issue Volume 7, Number 1 / 2011

Study on the Corrosion Mechanism of Zn-5Al-0.5Mg-0.08Si Coating

Study on the Corrosion Mechanism of Zn-5Al-0.5Mg-0.08Si Coating

Journal of Metallurgy, Vol. , No. () pp. -
A new type of hot-dip Zn-5Al-0.5Mg-0.08Si and Zn-5Al alloy coatings was performed on the cold rolled common steel. The hot-dip process was executed by self-made hot-dip galvanising simulator. SEM and EDS test results demonstrated that Mg was mainly distributed in crystal boundaries. XRD test results showed that the corrosion product of Zn-5Al-0.5Mg-0.08Si alloy coating was almost Zn5(OH)8C12⋅H2O. The features of Zn5(OH)8C12⋅H2O are low electric conductivity, insolubility and good adhesion.The corrosion resistance of alloy-coated steels was detected by neutral salt spray test. The microstructural characterization of the coating surface after neutral salt spray test and removing the corrosion products revealed that the corrosion process of Zn-5Al-0.5Mg-0.08Si coating was uniform and the coating surface was almost flat. As a result, the corrosion resistance of Zn-5Al-0.5Mg-0.08Si coating has a remarkable improvement with a factor of 9.2 compared with that of Zn-5Al coating.

High temperature corrosion behaviour of HVOF-sprayed Ni-20Cr coating on boiler steel in molten salt environment at 900

G. Kaushal; H. Singh; S. Prakash — 2011-12-24T23:20:50-05:00

High temperature corrosion behaviour of HVOF-sprayed Ni-20Cr coating on boiler steel in molten salt environment at 900
G. Kaushal; H. Singh; S. Prakash
International Journal of Surface Science and Engineering, Vol. 5, No. 5/6 (2011) pp. 415 - 433
Ni-20Cr coating was deposited on a commonly used boiler steel ASTM A213 347H by high-velocity oxy-fuel (HVOF) thermal spray process to enhance its high-temperature corrosion resistance. High temperature corrosion behaviour was investigated for the uncoated and HVOF sprayed Ni-20Cr coated boiler steel in a simulated boiler environment (Na<SUB align="right">2SO<SUB align=right>4-60%V<SUB align="right">2O<SUB align="right">5) at 900

Hot Corrosion of (Sm1−xYbx)2Zr2O7 (x=0, 0.5, 1.0) Ceramics Against V2O5 Molten Salt in Air at 800°C

Hot Corrosion of (Sm1−xYbx)2Zr2O7 (x=0, 0.5, 1.0) Ceramics Against V2O5 Molten Salt in Air at 800°C

International Journal of Applied Ceramic Technology, Vol. , No. () pp. -
(Sm1−xYbx)2Zr2O7 (x=0, 0.5, 1.0) powders synthesized by chemical‐coprecipitation and calcination method were pressureless‐sintered at 1700°C for 10 h in air. Molten V2O5 reacts with (Sm1−xYbx)2Zr2O7 to form m‐ZrO2 and rare‐earth vanadates at 800°C. The thickness of corrosion scales was investigated to evaluate the hot corrosion resistance of (Sm1−xYbx)2Zr2O7. The hot corrosion resistance of (Sm1−xYbx)2Zr2O7 against molten V2O5 increases with increasing Yb content. The hot corrosion mechanisms were proposed based on phase diagrams and the difference in hot corrosion resistance was discussed on terms of basicity of (Sm1−xYbx)2Zr2O7 ceramics.

Analysis of the Possibility to Assess the Occurrence of Hidden Corrosion in Lap Joints Using Active Thermography

Thu, 25 Aug 2011 21:27:46 GMT

Analysis of the Possibility to Assess the Occurrence of Hidden Corrosion in Lap Joints Using Active Thermography

Fatigue of Aircraft Structures, Vol. , No. (2011) pp. -

The article details the NDT technique of pulse thermography used for objective diagnosis of riveted lap joints construction. The degradation of materials manifesting in corrosion is inherent in the process of aircraft operation. One type of corrosion is galvanic corrosion occurring in the overlap joints (known as hidden corrosion). As a result of the potential difference between the two layers of the aluminum alloy skin, there occurs the phenomenon of oxidation of the material, producing corrosion products in the form of oxide compounds characterized by heat properties different than those of the base material. Active thermography techniques allow observing infrared energy, which changes due to the difference of thermal properties of the tested materials.

Content Type Journal Article
Pages 53-56
DOI 10.2478/v10164-010-0037-3
Authors
- Lukasz Kornas, Air Force Institute of Technology, Warsaw, Poland
- Krzysztof Dragan, Air Force Institute of Technology, Warsaw, Poland

Journal Fatigue of Aircraft Structures
Print ISSN 2081-7738

Journal Volume Volume 1

Journal Issue Volume 1, Number 3 / August 2011

Corrosion behavior of CuCrFeNiMn high entropy alloy system in 1 M sulfuric acid solution

Corrosion behavior of CuCrFeNiMn high entropy alloy system in 1 M sulfuric acid solution

Materials and Corrosion, Vol. , No. () pp. -
Immersion tests and potentiodynamic polarization measurements were conducted in 1 M sulfuric acid solution (H2SO4) at ambient temperature (∼25 °C) to investigate the corrosion behavior of CuCrFeNiMn alloy system. The results show that the alloys display a good general corrosion resistance that is mainly influenced by the Cu content and elemental segregation degree. The corrosion resistance degrades when increasing Cu content and elemental segregation degree. Among the tested alloys, the CuCr2Fe2Ni2Mn2 alloy with low Cu content and elemental segregation degree displays a better general corrosion resistance. On the contrary, the Cu2CrFe2NiMn2 alloy with high Cu content and elemental segregation degree exhibits the worst general corrosion resistance.

Electrochemical and analytical characterization of three corrosion inhibitors of steel in simulated concrete pore solutions

Jin-jie Shi Wei Sun — Thu, 12 Jan 2012 17:00:25 GMT

Electrochemical and analytical characterization of three corrosion inhibitors of steel in simulated concrete pore solutions
Jin-jie Shi Wei Sun
International Journal of Minerals, Metallurgy, and Materials, Vol. , No. (2012) pp. 38 - 47
Abstract Corrosion inhibitors for steel, such as sodium phosphate (Na3PO4), sodium nitrite (NaNO2), and benzotriazole (BTA), in simulated concrete pore solutions (saturated Ca(OH)2) were investigated. Corrosion behaviors of steel in different solutions were studied by means of corrosion potential (E corr), linear polarization resistance (LPR), electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization (PDP). A field emission scanning electron microscope (FESEM) equipped with energy dispersive X-ray analysis (EDXA) was used for observing the microstructures and morphology of corrosion products of steel. The results indicate that, compared with the commonly used nitrite-based inhibitors, Na3PO4 is not a good inhibitor, while BTA may be a potentially effective inhibitor to prevent steel from corrosion in simulated concrete pore solutions.

Electrochemical and analytical characterization of three corrosion inhibitors of steel in simulated concrete pore solutions

Jin-jie Shi Wei Sun — Thu, 12 Jan 2012 17:00:25 GMT

Electrochemical and analytical characterization of three corrosion inhibitors of steel in simulated concrete pore solutions
Jin-jie Shi Wei Sun
International Journal of Minerals, Metallurgy and Materials, Vol. , No. (2012) pp. 38 - 47
Abstract Corrosion inhibitors for steel, such as sodium phosphate (Na3PO4), sodium nitrite (NaNO2), and benzotriazole (BTA), in simulated concrete pore solutions (saturated Ca(OH)2) were investigated. Corrosion behaviors of steel in different solutions were studied by means of corrosion potential (E corr), linear polarization resistance (LPR), electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization (PDP). A field emission scanning electron microscope (FESEM) equipped with energy dispersive X-ray analysis (EDXA) was used for observing the microstructures and morphology of corrosion products of steel. The results indicate that, compared with the commonly used nitrite-based inhibitors, Na3PO4 is not a good inhibitor, while BTA may be a potentially effective inhibitor to prevent steel from corrosion in simulated concrete pore solutions.

Corrosion behavior of Ti–6Al–4V alloy weldment in hydrochloric acid

Corrosion behavior of Ti–6Al–4V alloy weldment in hydrochloric acid

Materials and Corrosion, Vol. , No. () pp. -
The corrosion behavior of a thin sheet of Ti–6Al–4V alloy was investigated in hydrochloric acid solution after welding by gas tungsten arc welding. The resulting microstructure of the weld metal (WM) consisted of coarse prior β grains containing fine acicular α platelets. It was found that both base metal (BM) and WM exhibited active–passive behavior after surface activation in open circuit potential experiments. The corrosion resistance of the BM and WM was found to decrease with increasing the temperature and acid concentration. However, the WM exhibited higher corrosion rate than the BM in all examined conditions. These results were also corroborated by electrochemical impedance spectroscopy measurements. Furthermore, it was revealed that the activation energy of the corrosion process for the WM was lower as compared to the BM, which confirmed the inferior corrosion behavior of the WM.

Influence of temperature and hydrodynamic conditions on the corrosion behavior of AISI 316L stainless steel in pure and polluted H3PO4: Application of the response surface methodology

2012-02-03T23:21:12Z

Influence of temperature and hydrodynamic conditions on the corrosion behavior of AISI 316L stainless steel in pure and polluted H3PO4: Application of the response surface methodology

Materials Chemistry and Physics, Vol. , No. (2012) pp. -
Publication year: 2012 Source: Materials Chemistry and Physics, Available online 2 February 2012 R. Sánchez-Tovar, M.T. Montañés, J. García-Antón, A. Guenbour Phosphoric acid is mainly produced by the wet acid process, where corrosion problems could be intensified due to the presence of impurities in the phosphate ores. Operating temperatures and flowing conditions aggravate the aforementioned problems. This work studies the influence of temperature (25–60 °C) and hydrodynamic conditions (Reynolds numbers from 1456 to 5066) on the corrosion of AISI 316L stainless steel in pure and polluted phosphoric acid solutions, by means of cyclic potentiodynamic polarization curves in a hydrodynamic circuit. The effect of temperature is the same as that caused by impurities, that is, higher corrosion rates and hindered passivation and repassivation resistance of the alloy. Statistical analysis by means of surface response methodology proved that the effect of temperature on the corrosion parameters of AISI 316L is more influential than the Reynolds number effect. The Reynolds number seems to have no significant influence on the corrosion behavior of stainless steel. Furthermore, the influence of temperature on the corrosion rate is much higher than on the rest of the corrosion parameters analyzed, especially in polluted phosphoric acid solutions. AISI 316L stainless steel has a clear interest for the phosphoric acid industry as a component material of some equipment due to its good corrosion properties at the different temperatures and Reynolds numbers studied even in polluted media. Highlights► Impurities increase corrosion rates and hinder passivation and repassivation resistance of AISI 316L SS. ► Temperature increases corrosion rate according to Arrhenius plot. ► Reynolds number seems to have no influence on the corrosion rate and repassivation parameters. ► RSM proved that the effect of temperature on the corrosion rate is enhanced by the impurities. ► AISI 316L SS has proved to be an excellent component material of some equipment in the phosphoric acid industry.

Corrosion Resistance Enhancement of Ti–47Al–2Cr by Thermal Treatment in a Controlled Atmosphere

Ehsan Saebnoori Taghi Shahrabi, Alireza Sabour Rouhaghdam, Majid Jafarian — 2012-03-17 00:00:00.0

Corrosion Resistance Enhancement of Ti–47Al–2Cr by Thermal Treatment in a Controlled Atmosphere
Ehsan Saebnoori Taghi Shahrabi, Alireza Sabour Rouhaghdam, Majid Jafarian
Anti-Corrosion Methods and Materials, Vol. , No. (2012) pp. -
Abstract

Purpose - The purpose of this study was to investigate the effect of thermal treatment at low partial pressure of oxygen on electrochemical corrosion resistance of Ti–47Al–2Cr (at %) intermetallic, known as '-TiAl alloy. Design/methodology/approach - The surfaces of the samples were modified by thermal treatment at different temperatures in N2 gas flow for an hour. Characterization of the modified surface layers was carried out by microscopic examinations, hardness and roughness tests, and X-ray diffraction analyses. Potentiodynamic polarization was used to evaluate the corrosion performance of '-TiAl in Ringer's solution.Findings - The results indicated that the alloy treated at 950°C had the optimum corrosion resistance, which can be attributed to the formation of an oxide layer by the surface thermal treatment and increasing of the passive layer thickness. Practical implications - Low corrosion rate (CR), high pitting potential (Epit), and more noble corrosion potential (Ecorr) gives the possibility to '-TiAl to be considered as a candidate for biomedical applications.Originality/value - This treatment is a novel method for surface modification of this type of alloy and results showed that it was an effective treatment and the corrosion resistance improved remarkably.

Exfoliation Corrosion and Pitting Corrosion and Their Role in Fatigue Predictive Modeling: State-of-the-Art Review

Exfoliation Corrosion and Pitting Corrosion and Their Role in Fatigue Predictive Modeling: State-of-the-Art Review

International Journal of Aerospace Engineering, Vol. , No. () pp. -
Intergranular attack (IG) and exfoliation corrosion (EC) have a detrimental impact on the structural integrity of aircraft structures of all types. Understanding the mechanisms and methods for dealing with these processes and with corrosion in general has been and is critical to the safety of critical components of aircraft. Discussion of cases where IG attack and exfoliation caused issues in structural integrity in aircraft in operational fleets is presented herein along with a much more detailed presentation of the issues involved in dealing with corrosion of aircraft. Issues of corrosion and fatigue related to the structural integrity of aging aircraft are introduced herein. Mechanisms of pitting nucleation are discussed which include adsorption-induced, ion migration-penetration, and chemicomechanical film breakdown theories. In addition, pitting corrosion (PC) fatigue models are presented as well as a critical assessment of their application to aircraft structures and materials. Finally environmental effects on short crack behavior of materials are discussed, and a compilation of definitions related to corrosion and fatigue are presented.

Comparative effect of N-decyl- and N-phenacylmethylpyridinium bromides in acid corrosion of steel

R. I. Yurchenko A. V. Dolina ; A. G. Yurchenko — Sat, 24 Dec 2011 16:47:01 GMT

Comparative effect of N-decyl- and N-phenacylmethylpyridinium bromides in acid corrosion of steel
R. I. Yurchenko A. V. Dolina ; A. G. Yurchenko
Russian Journal of Applied Chemistry, Vol. , No. (2011) pp. 2008 - 2010
Abstract Comparative analysis of inhibitory effect of N-decyl and N-phenacylmethylpyridinium bromides and their mixtures with potassium chloride, bromide, and iodide, and also with urotropin and paraform was carried out at corrosion of steel 08 KP in 3 M H2SO4 solutions.

Prediction of cover crack propagation in RC structures caused by corrosion

Prediction of cover crack propagation in RC structures caused by corrosion

Magazine of Concrete Research, Vol. , No. () pp. -

The paper proposes a model relating the level of reinforcement corrosion (in terms of loss of rebar radius) with the width of corrosion-induced cracks. The model is developed using a simulation of the process of corrosion-induced crack opening by means of finite-element (FE) modelling. Concrete is treated as a linear elastic material, a vertical crack is introduced above a reinforcing bar and expansive behaviour of corrosion products is modelled using a thermal analogy. Corrosion products are divided into those that penetrate (dissipate) into cracks (no crack propagation) and those that cause crack opening. The amount of corrosion products penetrating into cracks at a specified crack width is evaluated using FE modelling and analyses of experimental results. It was found that a corrosion loss of 0·1–0·4 mm dissipated into the cracks when the crack width was 1·0 mm. The influence of geometric parameters such as rebar diameter, spacing and location, and thickness of top and edge concrete covers were investigated. The limits of applicability of the proposed relationships were established using non-linear FE modelling.

Microbiologically influenced corrosion of X60 carbon steel in CO2‐saturated oilfield flooding water

Microbiologically influenced corrosion of X60 carbon steel in CO2‐saturated oilfield flooding water

Materials and Corrosion, Vol. , No. () pp. -
The corrosion behavior of X60 carbon steel in CO2‐saturated oilfield flooding water inoculated with sulfate‐reducing bacteria (SRB) was investigated using polarization curves and electrochemical impedance spectroscopy (EIS). With the propagation of SRB in the flooding water, the pH values of flooding water increased quickly in the initial 2 days and remained relatively steady during the later stage. Polarization curves showed that the corrosion current density decreased during the first 10 days due to the protection of corrosion products and SRB‐biofilms, and then increased possibly due to the partial detachment of the corrosion products and the biofilms. EIS analysis also showed that the charge transfer resistance increased initially and then decreased with exposure time. In the beginning of corrosion, the anodic dissolution of X60 steel was dominated by CO2. After the formation of SRB‐biofilms, part of FeCO3 corrosion products was converted to incompact FeS precipitates by SRB bio‐mineralization. Thus, the dispersed iron sulfide in SRB‐biofilms and X60 steel base may constitute a galvanic couple, accelerating the localized corrosion of the steel base in the flooding water.

The synergistic effect of Na3PO4 and benzotriazole on the inhibition of copper corrosion in tetra‐n‐butylammonium bromide aerated aqueous solution

The synergistic effect of Na3PO4 and benzotriazole on the inhibition of copper corrosion in tetra‐n‐butylammonium bromide aerated aqueous solution

Materials and Corrosion, Vol. , No. () pp. -
The effect of Na3PO4 and the mixture of benzotriazole (BTA) and Na3PO4 (SP) on the corrosion of copper in 17 wt% (0.534 mol/L) tetra‐n‐butylammonium bromide (TBAB) aerated aqueous solution has been investigated by means of weight‐loss test, potentiodynamic polarization test, electrochemical impedance spectroscopy (EIS), and scanning electron microscopy/energy dispersive X‐ray techniques. The experimental results showed that a dosage of Na3PO4 stimulated the copper corrosion, and the corrosion rate increased with increasing Na3PO4 concentration, whereas the mixture of BTA and Na3PO4 could protect copper in aqueous TBAB solution. The inhibition action of the mixture of BTA and Na3PO4 on the corrosion of copper is mainly due to the inhibition of the anodic process of corrosion. The inhibition efficiency of a mixture consisting of 2 g/L BTA and 1 g/L Na3PO4 was about 96%. The mixture of BTA and Na3PO4 inhibits the corrosion of copper better than BTA by itself, indicating that Na3PO4 has a synergistic role with BTA on the corrosion inhibition of copper in TBAB aqueous solution.

A new steel with good low‐temperature sulfuric acid dew point corrosion resistance

A new steel with good low‐temperature sulfuric acid dew point corrosion resistance

Materials and Corrosion, Vol. , No. () pp. -
In this work, new steels (1#, 2#, and 3#) were developed for low‐temperature sulfuric acid dew point corrosion. The mass loss rate, macro‐ and micro‐morphologies and compositions of corrosion products of new steels in 10, 30, and 50% H2SO4 solutions at its corresponding dew points were investigated by immersion test, scanning electron microscopy (SEM) and energy‐dispersive spectrometry (EDS). The results indicated that mass loss rate of all the tested steels first strongly increased and then decreased as H2SO4 concentration increased, which reached maximum at 30%. Corrosion resistance of 2# steel is the best among all specimens due to its fine and homogeneous morphologies of corrosion products. The electrochemical corrosion properties of new steels in 10 and 30% H2SO4 solutions at its corresponding dew points were studied by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The results demonstrated that corrosion resistance of 2# steel is the best among all the experimental samples due to its lowest corrosion current density and highest charge transfer resistance, which is consistent with the results obtained from immersion tests.

The classification of acoustic emission signals of 304 stainless steel during stress corrosion process based on K-means clustering

Jian Li Gang Du, Chen Jiang, Shijiu Jin — 2012-03-17 00:00:00.0

The classification of acoustic emission signals of 304 stainless steel during stress corrosion process based on K-means clustering
Jian Li Gang Du, Chen Jiang, Shijiu Jin
Anti-Corrosion Methods and Materials, Vol. , No. (2012) pp. -
Abstract

Purpose - The purpose of this paper is to classify and identify the acoustic emission (AE) signals of 304 stainless steel during stress corrosion process.Design/methodology/approach - The corrosion behavior of specimen during slow strain rate testing (SSRT) in acidic NaCl solution was studied. The AE signals during corrosion process were classified based on K-means cluster algorithms, meanwhile, the characteristics of different AE sources were analyzed.Findings - The results indicated that the AE characteristics of different AE sources, such as pitting, cracking, and bubble break-up, differ significantly. The 304 stainless steel was prone to the occurrence of stress corrosion cracking (SCC) under the SSRT condition in acidic NaCl solution.Originality/value - The characteristics of different AE sources during corrosion process were gained for the first time, which could be of much help in analyzing and judging the corrosion situation.

Issue 75 - The corrosion zone [Book Review]

Wed, 4 Jan 2012 09:42:32 GMT

Issue 75 - The corrosion zone [Book Review]

English in Aotearoa, Vol. , No. (2012) pp. -
Orange, Aleishia Review(s) of: Indexer please enter the following minimum information (where available): TITLE, AUTHOR(S) and ISBN for each book reviewed.The corrosion zone, by Barbara Strang, Headworx: Wellington, RRP $24.99.

Square concrete filled steel tubular (CFST) members under loading and chloride corrosion: Experiments

2011-12-29T01:16:21Z

Square concrete filled steel tubular (CFST) members under loading and chloride corrosion: Experiments

Journal of Constructional Steel Research, Vol. , No. (2011) pp. -
Publication year: 2011 Source: Journal of Constructional Steel Research, Available online 27 December 2011 Lin-Hai Han, Chao Hou, Qing-Li Wang This paper is an attempt to study the performance of concrete filled steel tubular (CFST) members with square sections under both loading and chloride corrosion. A total of 28 specimens, including 17 stub columns and 11 beams, were tested. The main parameters were loading ratio (from 0 to 0.75) during corrosion, as well as corrosion condition (no corrosion, and fully or half immersed into corrosive solution, respectively). According to the test, the effects of both loading and corrosion on the behaviour of CFST and reference hollow steel tubular members were analyzed. Comparisons between the predicted ultimate strength by using the existing codes of DBJ/T13-51-2010 and EC4-2004 and the testing results were proposed. Highlights► Studies of CFST members under both loading and chloride corrosion. ► CFST stub columns and beams tests. ► Effects of loading ratio and corrosion conditions.

Assessing corrosion mechanisms in Brazilian reinforced concrete bridges: Considerations on inspection procedures and detection techniques

Assessing corrosion mechanisms in Brazilian reinforced concrete bridges: Considerations on inspection procedures and detection techniques
Líbia da Costa Lourenço; João Cassim Jordy; Luiz Carlos Mendes
Journal of Building Appraisal, Vol. , No. () pp. -
Authors: Líbia da Costa Lourenço; João Cassim Jordy; Luiz Carlos Mendes Article URL: http://feeds.palgrave-journals.com/~r/jba/rss/current/~3/ElPaJfFnIL0/jba.2011.2 Citation: Journal of Building Appraisal 6, 249 (January 2011)

Inhibiting action of N-phenacylmethylheterylazolium bromides under conditions of acid steel corrosion

R. I. Yurchenko A. V. Dolina ; A. G. Yurchenko — Sat, 24 Dec 2011 16:47:04 GMT

Inhibiting action of N-phenacylmethylheterylazolium bromides under conditions of acid steel corrosion
R. I. Yurchenko A. V. Dolina ; A. G. Yurchenko
Russian Journal of Applied Chemistry, Vol. , No. (2011) pp. 2015 - 2017
Abstract Inhibiting action of N-phenacylmethylheterylazolium bromides based on imidazole, benzimidazole, benzthiazole, and their mixtures with potassium iodide, urotropin, or paraform on the steel corrosion in 3 M H2SO4 solutions was studied.

Processing thermography images for pitting corrosion quantification on small diameter ductile iron pipe

Zheng Liu, Marc Genest, Dennis Krys — 2012-01-15T02:57:31Z

Processing thermography images for pitting corrosion quantification on small diameter ductile iron pipe

NDT & E International, Vol. , No. (2012) pp. -
Publication year: 2012 Source: NDT & E International, Available online 13 January 2012 Zheng Liu, Marc Genest, Dennis Krys The condition of a metallic pipe is determined mainly by the extent to which it is corroded. Thus, the quantification of pitting corrosion in terms of metal loss is required for the understanding of pipe condition. There are different ways to quantify corrosion pit geometry. Direct methods measure the pit depth of pipe samples, which are sand/grit blasted to remove corrosion products, and are often adopted in laboratory. Indirect methods employ non-destructive inspection techniques to detect and quantify the corrosion without sandblasting, which is preferred for field test. In this study, the pulsed thermography is considered for fast quantification of pitting corrosion in a ductile iron pipe, which is sandblasted. The thermography testing generates a sequence of infrared images, which reflect the diffusion process of heat through pipe wall. This paper proposes a processing procedure to extract the corrosion information from the thermography images with phase congruency measurement and local binary fitting. The extracted feature is further related to the corrosion damage. Among all the features, the second principal component demonstrates a reasonably good linear relationship with metal loss of the pipe. The application potential is demonstrated by the experimental results.

Pitting corrosion susceptibility of ultrafine grains commercially pure aluminium produced by accumulative roll bonding process

Pitting corrosion susceptibility of ultrafine grains commercially pure aluminium produced by accumulative roll bonding process
Eizadjou M; Fattahi, H; Talachi, A K; Manesh, H D; Janghorban, K; Shariat, M H
Corrosion Engineering, Science and Technology, Vol. 47, No. 1 () pp. 19 - 24
Authors: Eizadjou M; Fattahi, H; Talachi, A K; Manesh, H D; Janghorban, K; Shariat, M H Article URL: http://www.ingentaconnect.com/content/maney/cest/2012/00000047/00000001/art00005 Citation: Vol 47 No. 1pp 19 24

Investigation of corrosion behavior of silver coated brass in acidic solutions

S. Zor H. İ. Ãœnal ; H. M. GÃ¶kergil — Fri, 18 Nov 2011 17:26:53 GMT

Investigation of corrosion behavior of silver coated brass in acidic solutions
S. Zor H. İ. Ünal ; H. M. Gökergil
Protection of Metals and Physical Chemistry of Surfaces, Vol. , No. (2011) pp. 813 - 820
Abstract The corrosion behavior of uncoated brass and electrolytically silver coated brass in cyanide solutions such as 0.1 M HCl, 0.1 M H2SO4 and 0.1 M H3PO4 was investigated by Tafel polarization curves and cyclic voltammetry curves at 1., 24., 48., 72., 96. and 168. hours. The coating efficiency was calculated by current density of corrosion determined from Tafel polarization curves. Surface analysis of coated brass immersed into acidic solution by 168 hours was done. It is concluded that silver coating is very effective to protect the corrosion of brass for a long time.

Mid-range corrosion resistant pumps

2011-12-31T22:01:31Z

Mid-range corrosion resistant pumps

World Pumps, Vol. , No. (2011) pp. -
Publication year: 2012 Source: World Pumps, Volume 2012, Issue 1, January 2012, Pages 8 [No author name available]

Electrochemical behavior of steel bar in electrolytes: Influence of pH value and cations

Qi Pu Linhua Jiang ; Hongqiang Chu ; Jinxia Xu ; Yi Xu — Mon, 19 Dec 2011 16:42:32 GMT

Electrochemical behavior of steel bar in electrolytes: Influence of pH value and cations
Qi Pu Linhua Jiang ; Hongqiang Chu ; Jinxia Xu ; Yi Xu
Journal of Wuhan University of Technology--Materials Science Edition, Vol. , No. (2011) pp. 1133 - 1136
Abstract Steel bar corrosion on electrolytes and the influence of cation were investigated. Three electrolytes of Ca(OH)2, NaOH and KOH with pH levels of 12.5, 11.5, 10.5, 9.5, 8.5 were prepared, meanwhile, the methods of free corrosion potential and electrochemical impedance spectra (EIS) were used to evaluate the influence of cations on the depassivation of the steel bar in electrolytes. The experimental results indicate that the initial corrosion pH value of the steel bar is influenced by the cation in electrolyte and the influence of K+ in electrolyte is the most remarkable, followed by Na+ and Ca2+. The initial corrosion pH values are 10.5 in KOH electrolyte, 9.5 in NaOH electrolyte and lower than 8.5 in Ca(OH)2 electrolyte.

Novel molecular approach using triazine inhibitor to control corrosion and limit chloride ion penetration in steel reinforced concrete

Satyanarayana M G V; Kalpana, Y; Himabindu, V; Kumar, K

Novel molecular approach using triazine inhibitor to control corrosion and limit chloride ion penetration in steel reinforced concrete
Satyanarayana M G V; Kalpana, Y; Himabindu, V; Kumar, K
Corrosion Engineering, Science and Technology, Vol. 47, No. 1 () pp. 38 - 44
Authors: Satyanarayana M G V; Kalpana, Y; Himabindu, V; Kumar, K Article URL: http://www.ingentaconnect.com/content/maney/cest/2012/00000047/00000001/art00008 Citation: Vol 47 No. 1pp 38 44

Acid corrosion of aluminum under conditions of contact plating of antimony

V. V. Bartenev O. I. Barteneva — Sun, 09 Nov 2008 10:10:30 GMT

Acid corrosion of aluminum under conditions of contact plating of antimony
V. V. Bartenev O. I. Barteneva
Protection of Metals, Vol. , No. (2008) pp. -
Abstract Specific features of the corrosion behavior of aluminum is studied in NaCl solutions with addition of antimony iodide under contact exchange conditions. It was found that the corrosion rate depends non-monotonously on the additive concentration. By varying the exposure time, the conditions for the inhibitive action of the additive are found. The analysis of the time dependences of the inhibition coefficient and partial inhibition coefficients that characterize the changes in the free corrosion potential of aluminum and the blocking of its surface with the antimony deposit demonstrates the dominating effect of the latter factor.

The electrochemical aspects of the influence of different binders on tne corrosion protection afforded by zinc-rich paints

M. Selvaraj S. Guruviah — Mon, 08 Sep 2008 19:56:32 GMT

The electrochemical aspects of the influence of different binders on tne corrosion protection afforded by zinc-rich paints
M. Selvaraj S. Guruviah
Surface Coatings International Part B Coatings Transactions, Vol. , No. (2008) pp. -
Journal Title: Surface Coatings International Part B Coatings Transactions Journal HomePage: http://www.springerlink.com/content/120855 Journal TOC RSS feeds: http://www.springerlink.com/content/120855?sortorder=asc&export=rss printISSN: 1476-4865 journaltocID: 12973 Publisher: Springer-Verlag

Effect of aluminum on the corrosion resistance of low‐alloy steel in 10 wt% sulfuric acid solution

Effect of aluminum on the corrosion resistance of low‐alloy steel in 10 wt% sulfuric acid solution

Materials and Corrosion, Vol. , No. () pp. -
The aqueous corrosion behavior of low‐alloy steel with aluminum contents was examined in a 10 wt% H2SO4 (pH 0.13) solution using electrochemical techniques and surface analyses. The corrosion resistance of the new alloy steel was evaluated in terms of electrochemical parameters, such as passive current density, film, and charge transfer resistances. The results showed that a high Al content in the steel imparted better passivation behavior resulting in a lower corrosion rate. It related to the enrichment of iron carbonate and hydrocarbon by the dissolution of the carbide phase.

Editorial Board

2012-02-03T23:21:24Z

Editorial Board

Corrosion Science, Vol. , No. (2012) pp. -
Publication year: 2012 Source: Building and Environment, Volume 52, June 2012, Pages IFC [No author name available]

Chapter 8 Corrosion by Sulfur

John, Young — 2009-08-17T19:04:35Z

Chapter 8 Corrosion by Sulfur
John, Young
Corrosion Series, Vol. 1, No. (2008) pp. 361 - 396
Publication year: 2008
Source: , Volume 1, 2008, Pages 361-396
John, Young

Fretting corrosion of electrolytic NiP coatings

I. R. Aslanyan J. -P. Celis ; L. Sh. Schuster — Thu, 22 Dec 2011 12:53:08 GMT

Fretting corrosion of electrolytic NiP coatings
I. R. Aslanyan J. -P. Celis ; L. Sh. Schuster
Journal of Friction and Wear, Vol. , No. (2011) pp. 419 - 423
Abstract The work considers the effect of additives of hardening submicron silicon carbides and heat treatment on the fretting corrosion in NaCl solution of nickel-phosphorus (NiP) coatings produced by electrolytic deposition. Tests are performed at amplitudes 100 and 500 μm. Pitting reveals the abrasive nature of the wear of all of the studied coatings. Introduction of silicon carbides into NiP coatings increases the number of pits in fretting corrosion. The pitting of NiP coatings is distributed regularly over the subsurface and pits are not so numerous. As the loading grows, fretting corrosion intensifies, though the friction coefficient declines in the majority of cases.

Electrochemical behavior of steel bar in electrolytes: Influence of pH value and cations

Qi Pu Linhua Jiang ; Hongqiang Chu ; Jinxia Xu ; Yi Xu — Mon, 19 Dec 2011 16:42:32 GMT

Electrochemical behavior of steel bar in electrolytes: Influence of pH value and cations
Qi Pu Linhua Jiang ; Hongqiang Chu ; Jinxia Xu ; Yi Xu
Journal of Wuhan University of Technology-Mater. Sci. Ed., Vol. , No. (2011) pp. 1133 - 1136
Abstract Steel bar corrosion on electrolytes and the influence of cation were investigated. Three electrolytes of Ca(OH)2, NaOH and KOH with pH levels of 12.5, 11.5, 10.5, 9.5, 8.5 were prepared, meanwhile, the methods of free corrosion potential and electrochemical impedance spectra (EIS) were used to evaluate the influence of cations on the depassivation of the steel bar in electrolytes. The experimental results indicate that the initial corrosion pH value of the steel bar is influenced by the cation in electrolyte and the influence of K+ in electrolyte is the most remarkable, followed by Na+ and Ca2+. The initial corrosion pH values are 10.5 in KOH electrolyte, 9.5 in NaOH electrolyte and lower than 8.5 in Ca(OH)2 electrolyte.

Physicochemical properties of steel surfaces with titanium nitride ion-plasma sprayed coating

A. I. Kostrzhitskii T. V. Cheban ; R. A. Podolyan — Sun, 09 Nov 2008 10:10:30 GMT

Physicochemical properties of steel surfaces with titanium nitride ion-plasma sprayed coating
A. I. Kostrzhitskii T. V. Cheban ; R. A. Podolyan
Protection of Metals, Vol. , No. (2008) pp. -
Abstract In nutral media, the regularities of the electrochemical corrosion of a steel, that had been sprayed by ionic plasma with titanium nitride, are studied. It is shown that the coating porosity is the principal factor determining its protective properties. Quantitative data on the effect of operation conditions on the coating porosity and corrosion-electrochemical behavior in liquids are given. Empirical formulas describing the kinetics of increasing the number of corrosion craters are obtained. Guidelines concerning the using of the ion-plasma coatings in the protecting of lean alloy steels against corrosion are formulated.

Analysis of reinforced concrete beams with corrosion damaged stirrups for shear capacity

Wed, 11 Aug 2010 07:00:00 GMT

Analysis of reinforced concrete beams with corrosion damaged stirrups for shear capacity

Structure and Infrastructure Engineering: Maintenance, Management, Life-Cycle Design and Performance, Vol. , No. (2010) pp. -
Structure and Infrastructure Engineering, Volume 0, Issue 0, Page 1-13, Ahead of Print.

Corrosion behaviour of Cr13 steel in CO2 saturated brine with high chloride concentration

Corrosion behaviour of Cr13 steel in CO2 saturated brine with high chloride concentration

Materials and Corrosion, Vol. , No. () pp. -
The corrosion behaviour of martensitic stainless injection‐pipeline steel X46Cr13 exposed to CO2 saturated artificial saline brine with high chloride concentration similar to onshore CCS‐site at Ketzin, Germany has been investigated by means of electrochemical technique and microscopic observations at short exposure times (up to 24 h) and by mass loss and metallographic observations at exposure times up to 17520 h. Pitting corrosion kinetics has been characterised and the predictions about the corrosion mechanism are made.

High temperature oxidation and corrosion of gas turbine component materials in burner rig exposures

Sumner Joy; Encinas-Oropesa, Adriana; Simms, Nigel J.; Oakey, John E.

High temperature oxidation and corrosion of gas turbine component materials in burner rig exposures
Sumner Joy; Encinas-Oropesa, Adriana; Simms, Nigel J.; Oakey, John E.
Materials at High Temperatures, Vol. 28, No. 4 () pp. 369 - 376
Authors: Sumner Joy; Encinas-Oropesa, Adriana; Simms, Nigel J.; Oakey, John E. Article URL: http://www.ingentaconnect.com/content/stl/maht/2011/00000028/00000004/art00018 Citation: Vol 28 No. 4pp 369 376

Chapter 9 Corrosion by Carbon

John, Young — 2009-08-17T19:04:35Z

Chapter 9 Corrosion by Carbon
John, Young
Corrosion Series, Vol. 1, No. (2008) pp. 397 - 453
Publication year: 2008
Source: , Volume 1, 2008, Pages 397-453
John, Young

Atomic layer deposition: state-of-the-art and research/industrial perspectives

reference-global@degruyter.com (Elia Marin et al) — Thu, 13 Oct 2011 10:45:50 GMT

Atomic layer deposition: state-of-the-art and research/industrial perspectives
reference-global@degruyter.com (Elia Marin et al)
Corrosion Reviews, Vol. , No. (2011) pp. -
Corrosion Reviews, Volume 0, Issue 0, Page -, Ahead of Print.

Cl-, SO42-, and PO43- Distribution in Concrete Slabs Ponded by Corrosion-Inhibitor-Added Deicing Salts

Jang J.-W.; Hagen M.G.; Engstrom G.M.; Iwasaki I.

Cl-, SO42-, and PO43- Distribution in Concrete Slabs Ponded by Corrosion-Inhibitor-Added Deicing Salts
Jang J.-W.; Hagen M.G.; Engstrom G.M.; Iwasaki I.
Advanced Cement Based Materials, Vol. 8, No. 3 () pp. 101 - 107
Authors: Jang J.-W.; Hagen M.G.; Engstrom G.M.; Iwasaki I. Article URL: http://www.ingentaconnect.com/content/els/10657355/1998/00000008/00000003/art00012 Citation: Vol 8 No. 3pp 101 107

Corrosion behavior of low‐alloy steel in the presence of Desulfovibrio caledoniensis

Corrosion behavior of low‐alloy steel in the presence of Desulfovibrio caledoniensis

Materials and Corrosion, Vol. , No. () pp. -
Sulfate‐reducing bacteria (SRB) are shown to be common inhabitants of oil reservoirs. Desulfovibrio caledoniensis isolated from a production well was used in this study. After an incubation period of 1 month with the SRB culture, two layers of corrosion products with different compositions were detected on the test coupons. The Tafel plots showed that the corrosion potential exhibited a cathodic shift and the corrosion rates increased with the incubation time. The analysis of the Nyquist diagrams revealed that the diffusion process begins to dominate with time in bacteria containing medium. These results are in good accordance with the Tafel data.

Mechanical and corrosion behaviours of Al/SiC and Al/Al2O3 metal matrix nanocomposites fabricated using powder metallurgy route

Mahmoud T S; El-Kady, E Y; Al-Shihri, A

Mechanical and corrosion behaviours of Al/SiC and Al/Al2O3 metal matrix nanocomposites fabricated using powder metallurgy route
Mahmoud T S; El-Kady, E Y; Al-Shihri, A
Corrosion Engineering, Science and Technology, Vol. 47, No. 1 () pp. 45 - 53
Authors: Mahmoud T S; El-Kady, E Y; Al-Shihri, A Article URL: http://www.ingentaconnect.com/content/maney/cest/2012/00000047/00000001/art00009 Citation: Vol 47 No. 1pp 45 53

Inhibitive and adsorption properties of ethanol extract of Hibiscus sabdariffa calyx for the corrosion of mild steel in 0.1 M HCl

Thu, 09 Jun 2011 07:00:00 GMT

Inhibitive and adsorption properties of ethanol extract of Hibiscus sabdariffa calyx for the corrosion of mild steel in 0.1 M HCl

Green Chemistry Letters and Reviews, Vol. , No. (2011) pp. -
Green Chemistry Letters and Reviews, Volume 0, Issue 0, Page 1-11, Ahead of Print.

Spatial and time-dependent reliability modelling of corrosion damage, safety and maintenance for reinforced concrete structures

Mon, 16 Aug 2010 07:00:00 GMT

Spatial and time-dependent reliability modelling of corrosion damage, safety and maintenance for reinforced concrete structures

Structure and Infrastructure Engineering: Maintenance, Management, Life-Cycle Design and Performance, Vol. , No. (2010) pp. -
Structure and Infrastructure Engineering, Volume 0, Issue 0, Page 1-13, Ahead of Print.

Effect of anchoring schemes for beams aged by accelerated corrosion and strengthened with carbon fibre-reinforced polymer

Tue, 04 Jan 2011 08:00:00 GMT

Effect of anchoring schemes for beams aged by accelerated corrosion and strengthened with carbon fibre-reinforced polymer

Structure and Infrastructure Engineering: Maintenance, Management, Life-Cycle Design and Performance, Vol. , No. (2011) pp. -
Structure and Infrastructure Engineering, Volume 0, Issue 0, Page 1-13, Ahead of Print.

Mechanical Properties and Corrosion Behavior of Carbon Nanotubes Reinforced AA 4032 Nanocomposites

Mechanical Properties and Corrosion Behavior of Carbon Nanotubes Reinforced AA 4032 Nanocomposites

Experimental Techniques, Vol. , No. () pp. -
Carbon nanotubes (CNTs) reinforced aluminum matrix composites were fabricated using powder metallurgy technique. The effect of nanotubes content on mechanical properties of the composites was investigated. Experimental results showed that nanotubes are homogeneously distributed in the composites. The corrosion of AA 4032 alloy based nanocomposite with CNTs was investigated by electrochemical polarization studies. CNTs‐reinforced composites have shown a better corrosion resistance than parent alloy. The nanotubes content significantly affect mechanical and corrosion properties of composite.

IFC - Ed. Board

2012-01-16T02:03:01Z

IFC - Ed. Board

Corrosion Science, Vol. , No. (2012) pp. -
Publication year: 2012 Source: Building and Environment, Volume 51, May 2012, Pages IFC [No author name available]

Electrochemical corrosion behaviour of Mg–Al alloys with thermal spray Al/SiCp composite coatings

Tue, 01 Nov 2011 14:31:46 GMT

Electrochemical corrosion behaviour of Mg–Al alloys with thermal spray Al/SiCp composite coatings

Welding International, Vol. , No. (2011) pp. -
Welding International, Volume 0, Issue 0, Page 1-11, Ahead of Print.

High Temperature Oxidation and Corrosion of Metals

2009-08-17T19:04:35Z

High Temperature Oxidation and Corrosion of Metals

Corrosion Series, Vol. 1, No. (2008) pp. -
Publication year: 2008
Source: , Volume 1, 2008, Page iii
[No author name available]

Life cycle cost management of concrete structures relative to chloride-induced reinforcement corrosion

Fri, 13 Aug 2010 07:00:00 GMT

Life cycle cost management of concrete structures relative to chloride-induced reinforcement corrosion

Structure and Infrastructure Engineering: Maintenance, Management, Life-Cycle Design and Performance, Vol. , No. (2010) pp. -
Structure and Infrastructure Engineering, Volume 0, Issue 0, Page 1-15, Ahead of Print.

Initial stages of local corrosion destruction of pipe steel in solutions imitating underfilm electrolyte

M. A. Petrunin L. B. Makseva ; T. A. Yurasova ; A. I. Marshakov — Sat, 26 Nov 2011 06:43:11 GMT

Initial stages of local corrosion destruction of pipe steel in solutions imitating underfilm electrolyte
M. A. Petrunin L. B. Makseva ; T. A. Yurasova ; A. I. Marshakov
Protection of Metals and Physical Chemistry of Surfaces, Vol. , No. (2011) pp. 856 - 862
Abstract Using the method of scanning reflectometry, it was determined that the pipe steel dissolves non-uniformly with a high rate of the appearance of local corrosion defects (pittings) in neutral solution imitating electrolyte. The parameters of individual pittings were determined, along with the fact that they propagate mainly at a depth that may cause corrosion cracking under cyclic mechanical stresses. Factors of stress intensity that cause local corrosion defects were calculated.

Chapter 4 Mixed Gas Corrosion of Pure Metals

John, Young — 2009-08-17T19:04:35Z

Chapter 4 Mixed Gas Corrosion of Pure Metals
John, Young
Corrosion Series, Vol. 1, No. (2008) pp. 139 - 183
Publication year: 2008
Source: , Volume 1, 2008, Pages 139-183
John, Young

Method to reduce corrosion losses in antibiotic production

K. R. Tarantseva N. V. Firsova ; O. V. Firsova — Sat, 26 Nov 2011 06:43:16 GMT

Method to reduce corrosion losses in antibiotic production
K. R. Tarantseva N. V. Firsova ; O. V. Firsova
Protection of Metals and Physical Chemistry of Surfaces, Vol. , No. (2011) pp. 863 - 865
Abstract Methods of improving the equipment corrosion resistance at the main stages of antibiotic production are considered from the perspective of the peculiarities of industry technological processes. The means suggested will enable the reduction of corrosion losses, as well as the improvement of the safety of drugs and their competitive capacity in the international market.

On a special feature of optimal design of structures operating in aggressive environment

G. V. Filatov — Tue, 26 Jul 2011 15:45:46 GMT

On a special feature of optimal design of structures operating in aggressive environment
G. V. Filatov
Strength of Materials, Vol. , No. (2011) pp. 259 - 267
Extensive numerical studies of the dependence of the stress-strain state influence function on corrosion process speed with regard to the stiffness of the optimized structure have been performed. For the optimum design of structures interacting with an aggressive environment, application of the method of repeated identification of mathematical models of corrosion fracture is proposed. Theoretical aspects of the problem are discussed. The procedure of definition of parameters of the mathematical model of the corrosion fracture providing evolutionary transition of the structure into the optimum state is provided.

Estimation of aggressiveness of seawater corrosion using indicators of microbiological activity of fouling communities formed on metals

U. V. Kharchenko I. A. Beleneva ; Yu. L. Kovalchuk ; V. A. Karpov — Sat, 26 Nov 2011 06:43:15 GMT

Estimation of aggressiveness of seawater corrosion using indicators of microbiological activity of fouling communities formed on metals
U. V. Kharchenko I. A. Beleneva ; Yu. L. Kovalchuk ; V. A. Karpov
Protection of Metals and Physical Chemistry of Surfaces, Vol. , No. (2011) pp. 907 - 910
Abstract Based on the quantitative characteristics of the fermentative activity of microorganisms that compose fouling communities formed on metals, the corrosion aggressiveness of seawater in the South China Sea and Sea of Japan was estimated. The regression relationship between the characteristics of the activity and main physical and chemical factors of the marine environment and the rate of corrosion in metal samples were established.

Corrosive activity of natural microbial associations at various conditions of cultivation

Sat, 29 Oct 2011 05:45:25 GMT

Corrosive activity of natural microbial associations at various conditions of cultivation
V. B. Rodin S. K. Zhigletsova ; N. A. Zhirkova ; N. V. Aleksandrova ; V. A. Chugunov ; V. P. Kholodenko
Applied Biochemistry and Microbiology, Vol. , No. (2011) pp. 615 - 620
Abstract Influence of microbial associations isolated from different ecological niches on corrosion of mild steel was changed depending on composition of medium and aeration regime. Both decrease and increase in corrosion losses were observed, which indicated that the subdivision of microorganisms into destructors and passivators of corrosion is merely conventional.

On the relation between corrosion resistance and electrophysical properties of oxide films on zirconium alloy

N. E. Nekrasova S. S. Kruglikov — Fri, 18 Nov 2011 17:26:58 GMT

On the relation between corrosion resistance and electrophysical properties of oxide films on zirconium alloy
N. E. Nekrasova S. S. Kruglikov
Protection of Metals and Physical Chemistry of Surfaces, Vol. , No. (2011) pp. 793 - 796
Abstract The electrophysical properties of oxide films formed on E-635 zirconium alloy upon corrosion testing at different variants of the finishing surface treatment are considered. An equivalent scheme that satisfactorily describes the electrophysical properties of the barrier layer of corrosion films is proposed at a supposition about the electrochemical heterogeneity of the films. The part of intermetallic compounds that shunt the dielectric ZrO2 layer is estimated.

Increasing the corrosion resistance of oil production equipment and pipelines

R. K. Vagapov — Sun, 09 Nov 2008 10:10:34 GMT

Increasing the corrosion resistance of oil production equipment and pipelines
R. K. Vagapov
Protection of Metals, Vol. , No. (2008) pp. -
The protective properties of corrosion inhibitors have been studied in stratal waters of some oil fields located in the Perm region and the Timano-Pechorsk oil and gas bearing province, which are characterized by a high level of mineralization and contain corrosion-aggressive components. The ability of inhibitors to produce protective aftereffect is evaluated. The dependence of the anodic and cathodic processes on steel on the composition of medium, corrosive agents, temperature, and inhibitors has been studied by electrochemical techniques.

Hydrogenation-induced corrosion cracking of Kh18N10T steel in a 1 N solution of hydrochloric acid at room temperature

V. N. Malyshev — Thu, 05 Jan 2012 06:44:13 GMT

Hydrogenation-induced corrosion cracking of Kh18N10T steel in a 1 N solution of hydrochloric acid at room temperature
V. N. Malyshev
Inorganic Materials: Applied Research, Vol. , No. (2012) pp. 618 - 623
Abstract This study concerns the estimation of the effect of metal hydrogenation on corrosion cracking of Kh18N10T steel induced by the action of a 1N solution of hydrochloric acid (HCl) at room temperature. The effect of the corrosion rate and temperature on efficiency of hydrogenation of surface layers of a metal is considered.

Effects of Cr3C2addition on the corrosion behavior of Ti(C, N)-based cermets

2011-11-05T21:02:15Z

Effects of Cr3C2addition on the corrosion behavior of Ti(C, N)-based cermets

International Journal of Refractory Metals and Hard Materials, Vol. , No. (2011) pp. -
Publication year: 2011 Source: International Journal of Refractory Metals and Hard Materials, Available online 4 November 2011 Weicai Wan, Ji Xiong, Mei Yang, Zhixing Guo, Guangbiao Dong, ... The Ti(C, N)-based cermets with different Cr3C2addition were prepared and the effects of Cr3C2addition on the microstructure and properties of cermets were discussed. The corrosion behavior of the cermets with different Cr3C2addition was investigated emphatically in 2 mol/L HNO3solution. The results indicate that there is no obvious effect of Cr3C2addition on the densification of the cermets, and all cermets are almost fully densified during sintering. The thickness of rim phase is reduced and the core size is increased remarkably in the cermets with 1 wt% and 3 wt% Cr3C2addition; the grains are refined significantly in the cermets with the increase of Cr3C2addition to 5 wt%. The hardness and transverse rapture strength of the cermets are improved with Cr3C2added properly. In HNO3solution, the corrosion resistance of cermets is improved remarkably by Cr3C2addition. The corrosion of binder phase is predominant in the cermets in which the Ni binder phase without Cr has lower corrosion resistance than the rim phase; whereas the corrosion resistance of binder phase with high Cr content is better compared to the rim phase, so that the degradation of rim phase is predominant and a reticulate binder phase forms. With the increase of Cr3C2addition, the Mo content in rim increases, and it is bad for the corrosion resistance of rim phase. Additionally, the inner rim phase has lower corrosion resistance than the outer rim phase owing to the higher Mo content. Highlights► Corrosion rates of cermets decreased with Cr3C2addition. ► Corrosion behavior of cermets with Cr3C2addition was classified to CCB, CCD and CCR. ► Corrosion resistance of binder was improved by Cr3C2to form a reticulate phase. ► Mo content in rim phase increased with Cr3C2addition. ► Corrosion resistance of rim was worsened by Cr3C2due to the increase of Mo in rim.

Corrosion behavior of titania films coated by liquid phase deposition on AISI304 stainless steel substrates

Corrosion behavior of titania films coated by liquid phase deposition on AISI304 stainless steel substrates

AIChE Journal, Vol. , No. () pp. -
Fouling deposition and localized corrosion on the heat transfer surfaces of the stainless steel equipments often simultaneously exist, which can introduce additional thermal resistance to heat transfer and damage heat transfer surfaces. It is a good anticorrosion way to coat a barrier layer of certain materials on the metal surface. In this paper, the TiO2 coatings with nano‐scale thicknesses were obtained by liquid phase deposition method on the substrates of AISI304 stainless steel. The coating thickness, surface roughness, surface morphology, crystal phase, chemical element were characterized with the film thickness measuring instrument, roughmeter, atomic force microscopy, the field emission scanning electron microscopy, X‐ray diffraction and the energy dispersive X‐ray spectroscopy analyzer, respectively. Corrosion behavior of the TiO2 coatings was evaluated by potentiodynamic polarization, cyclic voltammograms scanning, and electrochemical impedance spectroscopy tests with the mixed corrosion solution composed of 3.5 wt.% NaCl and 0.05M NaOH. It is shown that the TiO2 coating is composed of the nano‐particles with smooth, crack‐free, dense and uniform surface topography; the roughness of coating surface increases slightly compared with that of the polished AISI304 stainless steel substrate. The anatase phase TiO2 coatings are obtained when sintering temperature being varied from 573.15K to 923.15K and exhibit better anticorrosion behavior compared with AISI304 stainless steel surfaces. The corrosion current density decreases and the polarization resistance increases with the increase of the coating thickness. The corrosion resistance of the TiO2 coatings deteriorates with the increase of the corrosion time. The capacitance and the resistance of the corrosion product layer from the interface of the ASS substrate and the TiO2 coating is found after the corrosion time of 240h. A corrosion model was introduced and a possible new explanation on the anticorrosion mechanisms of the TiO2 coating was also analyzed. The corrosion mechanism of the TiO2 coating might comply with the multi‐stage corrosion process. © 2011 American Institute of Chemical Engineers AIChE J, 2011.

A practical application of thermal desorption mass spectrometry for studying inhibitors and corrosion products

A. K. Buryak T. M. Serdyuk ; A. V. Ul’yanov — Sun, 09 Nov 2008 10:10:33 GMT

A practical application of thermal desorption mass spectrometry for studying inhibitors and corrosion products
A. K. Buryak T. M. Serdyuk ; A. V. Ul’yanov
Protection of Metals, Vol. , No. (2008) pp. -
In the present review, examples of the practicality of applying thermal desorption mass spectrometry (TDMS) to study inhibitors and corrosion products are given. It is shown that the highly informative aspect of the method allows regularities of the processes occurring in volume, on surfaces, and in near-surface layers of steels and alloys to be established. The TDMS method makes it possible to identify adsorbed and chemisorbed inhibitors and corrosion products, as well as products of their destruction.

Determination of the corrosion rate of powder materials by electrochemical methods

Sat, 26 Nov 2011 06:43:11 GMT

Determination of the corrosion rate of powder materials by electrochemical methods
V. I. Kichigin O. M. Perel’man ; A. I. Rabinovich ; N. V. Bezmaternykh ; O. P. Koshcheev
Protection of Metals and Physical Chemistry of Surfaces, Vol. , No. (2011) pp. 921 - 925
Abstract The application of polarization and impedance measurements to determine the corrosion rate of porous materials and those infiltrated with copper, produced by powder metallurgy, in neutral chloride electrolyte is examined. The determination of the corrosion rate of porous powder materials per true surface area in view of their heterogeneity is described.

The effect of absorbed hydrogen on the corrosion behavior of sintered NdFeB magnet

The effect of absorbed hydrogen on the corrosion behavior of sintered NdFeB magnet

Materials and Corrosion, Vol. , No. () pp. -
The absorption of hydrogen by NdFeB magnet has been investigated by using the electrochemical charging technique at constant cathodic current density Ic ranging from 0 to 4 mA/cm2. Open circuit potential measurements (OCP) and polarization curves were carried out to study the corrosion behavior of the charged NdFeB magnet in 0.01 mol/L NaCl solution. The results showed that hydrogen had a strong influence on the corrosion of NdFeB magnet. The open circuit potential became gradually negative due to the hydrogen incorporation into the NdFeB magnet. The corrosion resistance was reduced gradually with the increasing cathodic current density Ic. The surface structure and the morphology of the charged NdFeB magnet were examined by XRD and SEM. The results revealed that the effect of the absorbed hydrogen focused mostly on accelerating the exfoliation corrosion of Nd2Fe14B matrix grain.

An efficient inverse analysis considering observation error to detect corrosion in concrete structures containing multilayered rebar

Koichi Minagawa Kazuhiro Suga ; Masanori Kikuchi ; Shigeru Aoki — Mon, 30 Jan 2012 16:05:00 GMT

An efficient inverse analysis considering observation error to detect corrosion in concrete structures containing multilayered rebar
Koichi Minagawa Kazuhiro Suga ; Masanori Kikuchi ; Shigeru Aoki
International Journal of Mechanics and Materials in Design, Vol. , No. (2012) pp. 1 - 7
Abstract The present paper proposes an efficient inverse analysis to detect corrosion in concrete structures including multilayered rebar using the observation accuracy as prior information. The proposed method can efficiently detect the corrosion profile, including factors such as the number, shape, and location of multiple corroded areas from a potential distribution on a concrete surface using the boundary element method and a genetic algorithm. The detectable are of rebar corrosion is estimated for each rebar layer. The estimation can effectively limit a solution space to detect corrosion. Numerical simulations are performed in order to demonstrate the validity and efficiency of the proposed method.

Influence of tensile stress on corrosion behaviour of high‐strength galvanized steel bridge wires in simulated acid rain

Influence of tensile stress on corrosion behaviour of high‐strength galvanized steel bridge wires in simulated acid rain

Materials and Corrosion, Vol. , No. () pp. -
Corrosion behaviour of the high‐strength galvanized steel wires under tensile stress was researched by electrochemical polarization and salt spray test (SST) using simulated acid rain as electrolyte. Electrochemical polarization and SST results showed corrosion rate rose significantly with increasing tensile stress; white grains were observed by SEM after polarization, while cellular and dendritic crystals appeared on the rust layer after SST. XRD and TG‐DTA results revealed (Zn(OH)2)3 · ZnSO4 · 5H2O was the main corrosion product, and traces of Fe2(SO4)2O · 7H2O, Fe2(SO4)3, Fe2O3 · H2O were also detected. A three‐stage corrosion process for the galvanized steel wires during SST was proposed.

Materials and Corrosion 1/2012

Materials and Corrosion 1/2012

Materials and Corrosion, Vol. , No. () pp. -
Cover: Hydrogen blistering, which was induced by the interaction of galvanic corrosion and crevice corrosion within the 0.5mm gap between titanium tube and carbon steel tube sheet, occurred at 35∼40°C on the outside wall of the tube used in the RCW (recirculating cooling water) heat exchanger of Qinshan Nuclear Power Plant in China. Afterwards, the tube wall was bulged inwards to the inside wall, and then localizedly thinned by oriented eddy erosion from the seawater containing sediment particles inside the tube until being ruptured.More detailed information can be found in: Z.‐G. Yang, Y. Gong, J.‐Z. Yuan, Failure analysis of leakage on titanium tubes within heat exchangers in a nuclear power plant. Part I: Electrochemical corrosion, Materials and Corrosion 2012, 63, page 7.

Corrosion mechanism of aluminum alloy by ethylene glycol‐based solution

Corrosion mechanism of aluminum alloy by ethylene glycol‐based solution

Materials and Corrosion, Vol. , No. () pp. -
Corrosion and failure mechanisms on an aluminum (Al) alloy by ethylene glycol base solution have been studied. Extensive crevice corrosion damage and localized scale deposition are clearly observed between the failed Al alloy surface and the rubber hose, in which the leakage of ethylene glycol‐based solution occurred under an actual operating. In addition, many micro‐cracks are found at the rubber hose which is clamped with the Al alloy. The scales on the Al surface appear to be due to the occurrence of Al corrosion, followed by the precipitation of additives of ethylene glycol‐based solution in the crevice between Al alloy and rubber hose. The mechanisms that can account for the crevice corrosion and solution leakage on the Al alloy surface are discussed.

Effect of surface treatments based on self‐assembling molecules and cerium coatings on the AA3003 alloy corrosion resistance

Effect of surface treatments based on self‐assembling molecules and cerium coatings on the AA3003 alloy corrosion resistance

Materials and Corrosion, Vol. , No. () pp. -
This work presents the effects of a cerium conversion coating, self‐assembling molecules (SAM) treatment, and a combination of these two treatments on the corrosion resistance of the AA3003 alloy. The results were compared to that of a conversion coating treatment with hexavalent chromium (Cr VI). The corrosion resistance of the surface‐treated AA3003 alloy samples was investigated by electrochemical impedance spectroscopy and anodic polarization curves in 0.5 mol/L sodium sulfate solution with pH adjusted to 4.0. The results showed that the SAM treatment offered better corrosion protection for the AA3003 alloy than that provided by cerium conversion coating. The combination of cerium conversion and SAM treatments improved the corrosion resistance of the AA3003 alloy due to SAM adsorption on the alloy substrate exposed at the defects in the cerium conversion layer.

Corrosion behavior of twinning‐induced plasticity (TWIP) steel

Corrosion behavior of twinning‐induced plasticity (TWIP) steel

Materials and Corrosion, Vol. , No. () pp. -
In this study, the corrosion behavior of twinning‐induced plasticity (TWIP) steel i.e. Fe‐Mn‐Al‐Si steel subjected to cold‐working (0, 20, and 35%), was examined in acidic (0.1 M H2SO4), alkaline (0.1 M NaOH) and chloride‐containing (3.5% NaCl) environments, using potentiodynamic polarization experiments. Interestingly, cold‐working did not show any significant change in the corrosion susceptibility of TWIP steel in all the three environments. However, TWIP steel showed the highest corrosion susceptibility in acidic environment and the lowest in alkaline environment. Scanning electron microscope analysis of the corroded TWIP steel samples revealed high‐localized attack in acidic environment and some pitting corrosion in chloride‐containing solution.

Corrosion Study of Steel API 5A, 5L and AISI 1080, 1020 in Drill-Mud Environment of Iranian Hydrocarbon Fields

Corrosion Study of Steel API 5A, 5L and AISI 1080, 1020 in Drill-Mud Environment of Iranian Hydrocarbon Fields

ISRN Materials Science, Vol. , No. () pp. -
API 5A and 5L (grades J55, H40, N80, and K55) are used in making drill pipe and well casing. In this paper after studying the rheological and chemical properties of the mud, the effective corrosion parameters were reviewed and studied. The drill pipe corrosion management, with reference to NACE PRO 502-2002 was made and showed that for 50 drilling rigs 120 million dollars is to be spent in 21 years for corrosion damage. Potentiodynamic polarization tests were made to study the drill-pipe (API 5A), well casing (API 5L), a connecting tube (AISI 1020), and drill cable (AISI 1080) corrosion behavior in different pH and mud chemistry; following these tests, the pitting potential at which wash-out of drill pipe occurs was determined.

Corrosion behavior of 6061/Al-15 vol. pct. SiC(p)composite and the base alloy in sodium hydroxide solution

2011-12-31T21:56:35Z

Corrosion behavior of 6061/Al-15 vol. pct. SiC(p)composite and the base alloy in sodium hydroxide solution

Arabian Journal of Chemistry, Vol. , No. (2011) pp. -
Publication year: 2011 Source: Arabian Journal of Chemistry, Available online 30 December 2011 P.D. Reena Kumari, Jagannath Nayak, A. Nityananda Shetty The corrosion behavior of 6061/Al-15 vol. pct. SiC(p)composite and 6061 Al base alloy was investigated in a sodium hydroxide solution. The electrochemical parameters were derived from potentiodynamic polarization and electrochemical impedance spectroscopic (EIS) techniques. The results showed that the corrosion resistance of the composite was lower than that of the base alloy in selected corrosion media. The corrosion rates of both the composite and the base alloy increased with the increase in the concentration of sodium hydroxide and also with the increase in temperature. The surface morphology of the metal surface was investigated using scanning electron microscope (SEM). Activation energy was evaluated using Arrhenius equation, and enthalpy of activation and entropy of activation values were calculated using transition state equation.

Corrosion Behavior of Mg-Al/TiC Composites in NaCl Solution

Corrosion Behavior of Mg-Al/TiC Composites in NaCl Solution

International Journal of Corrosion, Vol. , No. () pp. -
The corrosion behavior of TiC particles reinforced Mg-Al alloy in 3.5% NaCl solution has been evaluated using electrochemical techniques. Tested alloys included an Mg-9Al (Mg AZ91E) alloy with and without 56 wt. % TiC particles. Electrochemical techniques included potentiodynamic polarization curves, linear polarization resistance, electrochemical noise, and electrochemical impedance spectroscopy measurements. All techniques showed that the composite exhibited a lower corrosion rate than the base alloy. Evidence of galvanic effects that increased the composite corrosion rate was found between the matrix and the TiC particles. Additionally, the tendency to suffer from pitting corrosion was higher for the base alloy than that for the composite. Electrochemical impedance results showed the importance of adsorption/diffusion phenomena in both materials.

Corrosion behavior of 2A12 aluminum alloy in neutral salt spray environment with different Al‐clad removing processes

Corrosion behavior of 2A12 aluminum alloy in neutral salt spray environment with different Al‐clad removing processes

Materials and Corrosion, Vol. , No. () pp. -
In the process of assembling and machining, the aluminum alloy components will directly expose to aggressive environment once Al‐clad is destroyed. As such, it is meaningful to investigate the corrosion behavior of 2A12 aluminum alloy in neutral salt spray environment after removing Al‐clad coating with different processes. In this work, the corrosion behaviors of the aluminum alloy were evaluated by the changes in morphology, composition, and maximum mean corrosion depth. The results show that the corrosion rate of 2A12 aluminum alloy was very high in the first 24 h, and then decreased with test duration. Among all the Al‐clad removing processes, the one at higher temperature (90–100 °C) for shorter time (3–4 min) exhibit the best performance in the presence of inhibitor and sanding. The three possible reasons include effect of inhibitor adsorbing, role of sanding, impact of higher temperature, and shorter time.

Effects of chromium (VI) reducing agents in cement on corrosion of reinforcing steel

2011-09-11T07:54:30Z

Effects of chromium (VI) reducing agents in cement on corrosion of reinforcing steel
Ruzica Roskovic, Irina Stipanovic Oslakovic Jure Radic, Marijana Serdar
Biomembranes: A Multi-Volume Treatise, Vol. , No. (2011) pp. -
During the production of cement it is necessary to add a reducing agent that converts soluble hexavalent chromium into trivalent chromium. This paper explores effects of iron (II) sulphate reducing agents, namely monosulphate and heptahydrate, as cement admixtures, on corrosion of concrete reinforcement. Accelerated corrosion tests of reinforcing steel have been performed in pore solutions simulating concrete prepared using either CEM I or CEM II type cement, with addition of various concentrations of iron (II) sulphate reducing agent. All of the test results indicate corresponding tendencies and point towards the potential for iron (II) sulphate to foster or accelerate corrosion of the reinforcement. The results of this study indicate an immediate need for a more detailed research, especially in concrete as a more realistic corrosion environment, of the application of iron (II) sulphate as a reducing agent in cement.

Reactivation of metallic corrosion processes sustained by Iron-Reducing Bacteria: implication on long-term stability of protective layers

2011-10-30T20:44:42Z

Reactivation of metallic corrosion processes sustained by Iron-Reducing Bacteria: implication on long-term stability of protective layers

Physics and Chemistry of the Earth, Parts A/B/C, Vol. , No. (2011) pp. -
Publication year: 2011 Source: Physics and Chemistry of the Earth, Parts A/B/C, Available online 29 October 2011 L. Esnault, M. Jullien, C. Mustin, O. Bildstein, M. Libert In deep geological environments foreseen for the disposal of radioactive waste, metallic containers will undergo anaerobic corrosion. In this context, the formation of corrosion products such as magnetite may reduce the rate of these corrosion processes through the formation of a protective layer. This study aims at determining the direct impact of Iron-Reducing Bacteria (IRB) activity on the stability of corrosion protective layers. Batch experiments investigating iron corrosion processes including the formation of secondary magnetite and its subsequent alteration in the presence of IRB shows the bacteria ability to use structural Fe(III) for respiration which leads to the sustainment of a high corrosion rate. With the bio-reduction of corrosion products such as magnetite, and H2as electron donor, IRB promote the reactivation of corrosion processes in corrosive environments by altering the protective layer. This phenomenon could have a major impact on the long-term stability of metallic compounds involved in multi-barrier system for high-level nuclear waste containment. Highlights► We investigated the activity of Iron-Reducing Bacteria (IRB) on the stability of magnetite. ► Batch experiments evidenced that in the presence of H2as electron donor, IRB promote the reactivation of corrosion processes in corrosive environments by altering the canister protective layer. ► Bio-reduction of corrosion products could have a major impact on the long-term stability of metallic compounds in high-level nuclear waste repository conditions.

Corrosion detection with piezoelectric wafer active sensors using pitch-catch waves and cross-time-frequency analysis

Yu, L Giurgiutiu, V, Wang, J, Shin, Y.-J. — 2012-01-09T22:32:15-08:00

Corrosion detection with piezoelectric wafer active sensors using pitch-catch waves and cross-time-frequency analysis
Yu, L Giurgiutiu, V, Wang, J, Shin, Y.-J.
Structural Health Monitoring, Vol. 11, No. 1 (2012) pp. 83 - 93
A time–frequency analysis-based signal processing study for detecting active corrosion in aluminum plate-like structure utilizing the broadband piezoelectric wafer active sensors is presented in this article. Tests were conducted on an aluminum plate with a network of sensors installed on one side of the plate for Lamb wave generation and reception. The corrosion was emulated as material loss of an area of 50 x 38 mm2 on the opposite side of the plate. The corroded area resulted in a thickness loss on the plate and a change in wave propagation as well. The experimental data were first evaluated by a statistical damage index (DI) based on root mean square values and then the Cohen’s class motivated cross-time–frequency analysis. The cross-time–frequency analysis was found more reliable and precise for detecting the corrosion progression when compared to the DI method. Not only can the proposed metric correctly evaluate the phase difference of specific frequency and time, it also carries useful information of phase difference, which is strongly correlated to the physics of corrosion detection using Lamb waves. Novel aspects of this study include a sensing approach that can sense corrosion damage on both external and internal surfaces of a given structure, the employment of effective tuning in corrosion detection, and using cross-time–frequency analysis to quantitatively evaluate thickness loss. Though the corrosion studied herein is an idealized and simplified situation, the subject work on phase difference and cross-time–frequency analysis is useful first-step effort and opens a new way to perform Lamb wave-based corrosion detection. The results presented in this article combine easy-to-examine corrosion assumptions together with low-frequency antisymmetric Lamb wave analysis to provide a stepping stone for more complicated analysis needed for further real life corrosion assessment.

TBM testing in ITER: Requirements for the development of predictive tools to describe corrosion-related phenomena in HCLL blankets towards DEMO

2011-12-14T22:14:57Z

TBM testing in ITER: Requirements for the development of predictive tools to describe corrosion-related phenomena in HCLL blankets towards DEMO

Fusion Engineering and Design, Vol. , No. (2011) pp. -
Publication year: 2011 Source: Fusion Engineering and Design, Available online 14 December 2011 W. Krauss, J. Konys, A. Li-Puma Compatibility testing of RAFM-steels in Pb–15.7Li environment has shown that liquid metal corrosion is always present and dissolution of steel elements in hot areas of non-isothermal systems takes place whereas a transport of the corrosion products and formed precipitates has to be considered in the TBM design.It is clear that for the design of a HCLL breeding blanket system for DEMO and to ensure the safety over a fusion power plant lifetime, a good knowledge of the corrosion behavior including the dominating mechanisms is required. Simulation tools predicting the corrosion behavior of bare and coated Eurofer in Pb–15.7Li must be implemented and validated in a real fusion environment where numerous physical phenomena are additionally present, compared to the state of the art corrosion knowledge, such as neutron flux, H, T permeation, MHD effects, temperature field with steep gradients.The state of the art will be shown and discussed using some of the main fundamental corrosion data selected from own testing campaigns and published literature regarding corrosion behavior of TBMs.On this basis a test matrix for TBM testing in ITER is presented in the paper and the deficits in present knowledge are outlined deviating future development needs in corrosion. Highlights► To collect corrosion data relevant for TBM operation in updated facilities. ► To develop predictive tools (corrosion, transport, precipitation, impurity effects). ► To perform validation of predictive tools. ► To develop/qualify components for TBM tests in ITER.

Materials, Vol. 4, Pages 1144-1167: In Vivo Corrosion of Two Novel Magnesium Alloys ZEK100 and AX30 and Their Mechanical Suitability as Biodegradable Implants

2011-06-21

Materials, Vol. 4, Pages 1144-1167: In Vivo Corrosion of Two Novel Magnesium Alloys ZEK100 and AX30 and Their Mechanical Suitability as Biodegradable Implants
Tim Andreas Huehnerschulte; Nina Angrisani; Dina Rittershaus; Dirk Bormann; Henning Windhagen; Andrea Meyer-Lindenberg
Materials, Vol. 4, No. 6 (2011) pp. 1144 - 1167
In magnesium alloys, the components used modify the alloy properties. For magnesium implants in contact with bone, rare earths alloys are commonly examined. These were shown to have a higher corrosion resistance than other alloys and a high mechanical strength, but their exact composition is hard to predict. Therefore a reduction of their content could be favorable. The alloys ZEK100 and AX30 have a reduced content or contain no rare earths at all. The aim of the study was to investigate their in vivo degradation and to assess the suitability of the in vivo µCT for the examination of their corrosion. Implants were inserted in rabbit tibiae. Clinical examinations, X-rays and in vivo µCT scans were done regularly. Afterwards implants were analyzed with REM, electron dispersive X-ray (EDX), weighing and mechanical testing. The in vivo µCT is of great advantage, because it allows a quantification of the corrosion rate and qualitative 3D assessment of the corrosion morphology. The location of the implant has a remarkable effect on the corrosion rate. Due to its mechanical characteristics and its corrosion behavior, ZEK100 was judged to be suitable, while AX30, which displays favorable degradation behavior, has too little mechanical strength for applications in weight bearing bones.

The corrosion inhibitory property of N,N‐bis(2‐benzimidazolylmethyl)amine for Q235 steel

The corrosion inhibitory property of N,N‐bis(2‐benzimidazolylmethyl)amine for Q235 steel

Materials and Corrosion, Vol. , No. () pp. -
The main purpose of this paper is to systematically evaluate the anti‐corrosion property of N,N‐bis(2‐benzimidazolylmethyl)amine (IDB), which is a novel good thermal stabilized inhibitor in acidic medium. Results obtained from electrochemical tests and corrosion surface morphology analyses reveal that IDB performs excellently as corrosion inhibitor for Q235 steel in 1 mol/L hydrochloric acid corrosive solution. Potentiodynamic polarization measurements show that IDB inhibits both the anodic and cathodic processes of corrosion and exhibits as a mixed‐type inhibitor. Besides, the inhibiting efficiency (IE%) and consequently the degree of surface coverage (θ) increase with the inhibitor concentration rising. And when the concentration is 20 × 10−5 mol/L, the corrosion inhibition effect is best to reach 96.39%. The adsorption of inhibitor on Q235 steel is found to obey the Langmuir adsorption isotherm, and the calculated Gibbs free energy demonstrates that IDB spontaneously adsorbs and forms a protective chemisorbed film on Q235 steel to restrain its corrosion. Hereby, IDB will become a promising corrosion inhibitor in further.

A corrosion map of Abu Dhabi

A corrosion map of Abu Dhabi

Materials and Corrosion, Vol. , No. () pp. -
This paper outlines how a corrosion map of zinc was developed for Abu‐Dhabi. It presents inputs into the model being databases of RH, rainfall, salt deposition and time of wetness and explains how these inputs are combined to product the corrosion map of Abu Dhabi. It is found that although the corrosion rate generally falls with distance from the Arabian Gulf, corrosion rates in the hinterland of the central coast and in the Hajar Mountains are higher than would be expected from a simple dependence on distance from the coast. The higher corrosion rates around the central coast are associated with the extremely low rainfall while those in the Hajar Mountains may be associated with the transport of airborne salinity from the Gulf of Oman. In general, the corrosion rates in Abu Dhabi are much higher than observed at sites in Australia and South East Asia with similar levels of airborne salinity which is attributed to the much higher quantities of salt that are retained on metal surfaces in Abu Dhabi (relative to Australia) due to the fact that rain washing events, which are frequent and effective in Australia, are very infrequent in Abu Dhabi.

Corrosion behaviour of CrN/Cr multilayers on stainless steel deposited by unbalanced magnetron sputtering

2012-01-29T02:06:40Z

Corrosion behaviour of CrN/Cr multilayers on stainless steel deposited by unbalanced magnetron sputtering

Vacuum, Vol. , No. (2012) pp. -
Publication year: 2012 Source: Vacuum, Available online 28 January 2012 Y.L. Chipatecua, J.J. Olaya, Diego F. Arias This paper reports the results of the influence of bilayer period (Λ) and total thickness (f) on the corrosion resistance of magnetron-sputtered CrN/Cr multilayers. Corrosion tests were carried out by potentiodynamic polarization with 0.5M H2SO4+ 0.05M KSCN solution and electrochemical impedance spectroscopy (EIS) with 3% NaCl solution. Measurements were also taken on the uncoated substrate and hard chromium coatings for comparison. Multilayer microstructure and morphology were studied by X-ray diffraction (XRD), atomic force microscopy (AFM) and scanning electron microscopy (SEM) and chemical composition was studied by energy dispersive X-ray analysis (EDX).The experiments showed that CrN/Cr coatings having lower bilayer period and lower thickness increased their efficiency as a barrier and improved the corrosion resistance of all coatings evaluated. Highlights► We studied the influence of bilayer period on CrN/Cr multilayers corrosion resistance. ► CrN/Cr multilayers were produced by using unbalanced magnetron. ► The CrN/Cr multilayers have better corrosion resistance than AISI 304 substrate. ► Decreasing the bilayer period will increase corrosion resistance

Corrosion properties of S-phase layers formed on medical grade austenitic stainless steel

Joseph Buhagiar Hanshan Dong — Mon, 12 Dec 2011 17:13:11 GMT

Corrosion properties of S-phase layers formed on medical grade austenitic stainless steel
Joseph Buhagiar Hanshan Dong
Journal of Materials Science: Materials in Medicine, Vol. , No. (2011) pp. 1 - 11
Abstract The corrosion properties of S-phase surface layers formed in AISI 316LVM (ASTM F138) and High-N (ASTM F1586) medical grade austenitic stainless steels by plasma surface alloying with nitrogen (at 430°C), carbon (at 500°C) and both carbon and nitrogen (at 430°C) has been investigated. The corrosion behaviour of the S-phase layers in Ringer’s solutions was evaluated using potentiodynamic and immersion corrosion tests. The corrosion damage was evaluated using microscopy, hardness testing, inductive coupled plasma mass spectroscopy and X-ray diffraction. The experimental results have demonstrated that low-temperature nitriding, carburising and carbonitriding can improve the localised corrosion resistance of both industrial and medical grade austenitic stainless steels as long as the threshold sensitisation temperature is not reached. Carburising at 500°C has proved to be the best hardening treatment with the least effect on the corrosion resistance of the parent alloy.

Preparation and Characterization of the Solid-State Ag/AgCl Reference Electrode for RC Structures

Guofu Qiao Huigang Xiao, Yi Hong, Yuelan Qiu — 2012-03-23 00:00:00.0

Preparation and Characterization of the Solid-State Ag/AgCl Reference Electrode for RC Structures
Guofu Qiao Huigang Xiao, Yi Hong, Yuelan Qiu
Sensor Review, Vol. , No. (2012) pp. -
Abstract

Purpose - Corrosion sensors and networks are the most effective techniques to obtain the corrosion information and recognize the corrosion status of the reinforcing concrete structures. However, reference electrode is the key element to provide the baseline for potential control of the corrosion monitoring sensors during corrosion measurement process. Therefore, this paper aims to provide the novel solid-state reference electrode for the corrosion sensors.Design/methodology/approach - A solid-state Ag/AgCl reference electrode has been prepared. Furthermore, the performance of the reference electrode, such as stability, temperature response, anti-polarization and influence of the concrete admixture, has been investigated.Findings - The results indicate that the balance potential and the temperature coefficient of the reference electrode are 3.64 mv±1mv (vs. SCE) at 25' and -0.51 mv/'±0.03mv/', respectively. Furthermore, the polarization curve exhibits characteristics of three stages as the polarization current is in [-10µA/cm2, +10µA/cm2]. Additionally, the reference electrode is insensitive to the concrete admixtures which include Na2SO4, NaCl, NaNO3 and NaNO2.Originality/value - The research provides the key element for the corrosion monitoring sensors to integrate structural health monitoring system in future.

Measuring the corrosion rate of steel in concrete – effect of measurement technique, polarisation time and current

Measuring the corrosion rate of steel in concrete – effect of measurement technique, polarisation time and current

Materials and Corrosion, Vol. , No. () pp. -
Both on‐site investigations and laboratory studies have shown that different corrosion rates are obtained when different commercially available corrosion rate instruments are used. The different electrochemical techniques and the measurement parameters used, i.e. polarisation current and time, are in some studies considered the main reasons for the variations. This paper presents an experimental study on the quantitative effect of polarisation time and current on the measured polarisation resistance – and thus the corrosion current density – of passively and actively corroding steel. Two electrochemical techniques often used in instruments for on‐site corrosion rate measurements are investigated. On passively corroding reinforcement the measured polarisation resistance was for both techniques found to be highly affected by the polarisation time and current and no plateaus at either short or long polarisation times, or low or high polarisation currents were identified. On actively corroding reinforcement a large effect of the polarisation time was also found, but only a minor effect of the polarisation current. The effect of the polarisation time was, however, practically independent of the corrosion rate for actively corroding steel. For both techniques guidelines for polarisation times and currents are given for (on‐site) non‐destructive corrosion rate measurements on reinforcement steel in concrete.

Corrosion at the urea injection in SCR‐system during component test

Corrosion at the urea injection in SCR‐system during component test

Materials and Corrosion, Vol. , No. () pp. -
The corrosion behaviour of the austenitic stainless steels 304L and 904L was investigated after component testing in diesel exhaust urea environment. Cross‐sectional analyses and depth profiling of corrosion products were performed with Auger electron spectroscopy (AES) and X‐ray photoelectron spectroscopy (XPS). The samples of both materials displayed high amounts of silicon oxide on their surfaces, though this did not appear to have an active role in the corrosion. The higher alloyed 904L exhibited only small signs of corrosion and the inner oxide below the silicon oxide was chromium rich. Substantial nitrogen uptake was detected, presumably due to the presence of NH3, cyanates and similar species. The lower alloyed 304L showed more severe corrosion. The oxide on the 304L samples mainly consisted of iron oxide apart from the silicon oxide present. The nitrogen uptake was less pronounced and possibly connected to presence of nitride precipitates. The most pronounced corrosion was detected at sites where deposits frequently form and decompose. Those deposits are a probable nitrogen source and may also form compounds enabling the breakdown of the oxide.

A critical consideration for the use of Al-cladding for protecting aircraft aluminum alloy 2024 against corrosion

Sp.G. Pantelakis, A.N. Chamos, Al.Th. Kermanidis — 2011-12-31T22:01:21Z

A critical consideration for the use of Al-cladding for protecting aircraft aluminum alloy 2024 against corrosion

Theoretical and Applied Fracture Mechanics, Vol. , No. (2011) pp. -
Publication year: 2011 Source: Theoretical and Applied Fracture Mechanics, Available online 30 December 2011 Sp.G. Pantelakis, A.N. Chamos, Al.Th. Kermanidis The necessity of involving Al cladding as a means of protecting the aircraft aluminum alloy 2024 against corrosion has been assessed experimentally. Bare as well as Al-clad protected 2024 specimens were pre-corroded and then subjected to mechanical tests. By recognizing the lack on validated concepts for the laboratory simulation of the corrosion damage expected in the service conditions of an aircraft structure, in the present work two different laboratory corrosion tests, namely the immersion of the alloy in a 3.5% NaCl solution, and the exfoliation corrosion test have been employed for pre-corroding the specimens. For the case of the aggressive exfoliation corrosion environment the protective role of Al-cladding is essential for ensuring the good tensile and fatigue behavior of the 2024 alloy. On the other hand, the results have shown that for the case of the mild 3.5% NaCl solution environment, the use of a cladding layer downgrades the fatigue behavior of the material, thus giving raise to doubt on the need of involving cladding. The results demonstrate the need for systematic efforts for the development of concepts which will allow the laboratory simulation of corrosion accumulated in service.

Corrosion properties of S-phase layers formed on medical grade austenitic stainless steel

Joseph Buhagiar Hanshan Dong — Mon, 12 Dec 2011 17:13:11 GMT

Corrosion properties of S-phase layers formed on medical grade austenitic stainless steel
Joseph Buhagiar Hanshan Dong
Journal of Materials Science Materials in Medicine, Vol. , No. (2011) pp. 1 - 11
Abstract The corrosion properties of S-phase surface layers formed in AISI 316LVM (ASTM F138) and High-N (ASTM F1586) medical grade austenitic stainless steels by plasma surface alloying with nitrogen (at 430°C), carbon (at 500°C) and both carbon and nitrogen (at 430°C) has been investigated. The corrosion behaviour of the S-phase layers in Ringer’s solutions was evaluated using potentiodynamic and immersion corrosion tests. The corrosion damage was evaluated using microscopy, hardness testing, inductive coupled plasma mass spectroscopy and X-ray diffraction. The experimental results have demonstrated that low-temperature nitriding, carburising and carbonitriding can improve the localised corrosion resistance of both industrial and medical grade austenitic stainless steels as long as the threshold sensitisation temperature is not reached. Carburising at 500°C has proved to be the best hardening treatment with the least effect on the corrosion resistance of the parent alloy.

Galvanostatic Anodic Polarization Curves and Galvanic Corrosion of AZ31B in 0.01 M Na2SO4 Saturated with Mg(OH)2

Galvanostatic Anodic Polarization Curves and Galvanic Corrosion of AZ31B in 0.01 M Na2SO4 Saturated with Mg(OH)2

Advanced Engineering Materials, Vol. , No. () pp. -
Measured polarization curves were used in a BEM model of the galvanic corrosion of the Mg alloy AZ31B. The AZ31B galvanostatic anodic polarization curves indicated: (i) the existence of the uni‐positive Mg+ ion, (ii) some hydrogen dissolved in the AZ31B metal, and (iii) self corrosion was more important than the applied current density in causing weight loss. Galvanic corrosion of the AZ31B consisted of: (i) corrosion that decreased in depth from the 2024–AZ31B interface, and (ii) heterogeneous corrosion that was denser closer to the 2024–AZ31B interface. There was good agreement between the BEM model and the experimental measurements.The AZ31B galvanostatic anodic polarization curves indicated: (i) the existence of the uni‐positive Mg+ ion, (ii) some hydrogen dissolved in the AZ31B metal, and (iii) self corrosion was more important than the applied current density in causing weight loss. There was good agreement between the BEM model and the experimental measurements

Corrosion behavior of nanostructured Ni‐Si3N4 composite films: A study of electrochemical impedance spectroscopy

Corrosion behavior of nanostructured Ni‐Si3N4 composite films: A study of electrochemical impedance spectroscopy

Materials and Corrosion, Vol. , No. () pp. -
Ni‐Si3N4 nanocomposite films with both the consecutive Ni crystallites and dispersed Si3N4 particles in the nanometer range have been fabricated using DC electroplating technique, and characterized by scanning electron microscopy (SEM), transmission electron microscope (TEM), and X‐ray diffraction (XRD). The corrosion resistance of the Ni‐Si3N4 nanocomposite film has been compared to that of pure Ni coating through polarization. Meanwhile, the corrosion process of Ni‐Si3N4 nanocomposite film in neutral 3.5% NaCl solution has been investigated using electrochemical impedance spectroscopy (EIS). The results show that the Ni‐Si3N4 nanocomposite film is more resistant to corrosion than the pure Ni coating. The corrosion of Ni‐Si3N4 nanocomposite film is controlled by electrochemical step, and the whole corrosion process is divided into two sequential stages. The main corrosion type of Ni‐Si3N4 nanocomposite films in neutral 3.5% NaCl solution is pitting.

Corrosion rate of construction materials in hot phosphoric acid with the contribution of anodic polarization

Corrosion rate of construction materials in hot phosphoric acid with the contribution of anodic polarization

Materials and Corrosion, Vol. , No. () pp. -
The paper is focused on selection of a proper material for construction elements of water electrolysers, which make use of a 85% phosphoric acid as an electrolyte at temperature of 150 °C and which might be loaded with anodic polarization up to 2.5 V versus a saturated Ag/AgCl electrode (SSCE). Several grades of stainless steels were tested as well as tantalum, niobium, titanium, nickel alloys and silicon carbide. The corrosion rate was evaluated by means of mass loss at free corrosion potential as well as under various levels of polarization. The only corrosion resistant material in 85% phosphoric acid at 150 °C and at polarization of 2.5 V/SSCE is tantalum. In that case, even a gentle cathodic polarization is harmful in such an acidic environment. Hydrogen reduction leads to tantalum hydride formation, to loss of mechanical properties and to complete disintegration of the metal. Contrary to tantalum, titanium is free of any corrosion resistance in hot phosphoric acid. Its corrosion rate ranges from tens of millimetres to metres per year depending on temperature of the acid. Alloy bonded tantalum coating was recognized as an effective corrosion protection for both titanium and stainless steel. Its serviceability might be limited by slow dissolution of tantalum that is in order of units of mm/year.

Femoral Stem Fracture and In Vivo Corrosion of Retrieved Modular Femoral Hips

2011-12-30T02:45:12Z

Femoral Stem Fracture and In Vivo Corrosion of Retrieved Modular Femoral Hips

The Journal of Arthroplasty, Vol. , No. (2011) pp. -
Publication year: 2011 Source: The Journal of Arthroplasty, Available online 28 December 2011 J. Caitlin Huot Carlson, Douglas W. Van Citters, John H. Currier, Amber M. Bryant, Michael B. Mayor, ... A series of 78 retrieved modular hip devices were assessed for fretting and corrosion. Damage was common at both the head-neck junction (54% showing corrosion; 88% showing fretting) and at the stem-sleeve junction (88% corrosion; 65% fretting). Corrosion correlated to in vivo duration, patient activity, and metal (vs ceramic) femoral heads but did not correlate to head carbon content. Femoral stem fatigue fracture was observed in seven retrievals; all had severe corrosion, were under increased stress, and were in vivo longer than the non-fractured cohort. This study emphasizes the potential for stem fracture when small diameter femoral stems with large offsets are used in heavy and active patients. Designs which reduce fretting and corrosion in modular implants is warranted as patients demand longer lasting implants.

Effects of silty sand on CO2 corrosion behavior of low-Cr tubing steel

Fri, 06 Jan 2012 16:47:21 GMT

Effects of silty sand on CO2 corrosion behavior of low-Cr tubing steel

Chinese Science Bulletin, Vol. , No. (2012) pp. -

Abstract

An experimental study was carried out to assess the effects of silty sand on the CO₂ corrosion behavior of 1 wt% Cr (1Cr) and 3 wt% Cr (3Cr) tubing steel under 0.5 MPa CO₂ at 100°C and 1.5 m/s flow velocity. The 1Cr and 3Cr specimens both suffered general corrosion, but the surface was coarser in the pure CO₂ corrosion environment. Under silty sand conditions, severe pitting corrosion occurred on the 1Cr specimens and some acicular pitting appeared on the 3Cr specimens. The average corrosion rates of 1Cr and 3Cr steels increased by factors of 3 and 1.6, respectively. The corrosion products were analyzed by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and electrical impedance spectroscopy (EIS). The results show that silty sand acts as an inclusion in corrosion product films and reduces the homogeneity and density of the products, rather than abrading the corrosion film. Ion-diffusion channels may build up around the irregular silty sand; this would degrade the protective capabilities of the product films and aggravate corrosion.

Content Type Journal Article
Category Article
Pages 1-8
DOI 10.1007/s11434-011-4947-4
Authors
- Wei Yan, State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing, 102249 China
- JinGen Deng, State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing, 102249 China
- XiaoRong Li, State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing, 102249 China
- XingLiang Dong, China National Offshore Oil Company, Beijing, 100600 China
- ChunYang Zhang, China National Offshore Oil Company, Beijing, 100600 China

Journal Chinese Science Bulletin
Online ISSN 1861-9541
Print ISSN 1001-6538

The effect of 0.4 wt.% Mn addition on the localized corrosion behaviour of zinc in a long-term experiment

2012-02-03T23:21:28Z

The effect of 0.4 wt.% Mn addition on the localized corrosion behaviour of zinc in a long-term experiment

Journal of Manufacturing Processes, Vol. , No. (2012) pp. -
Publication year: 2012 Source: Electrochimica Acta, Available online 1 February 2012 Xiu-Ling Shang, Bo Zhang, En-Hou Han, Wei Ke The corrosion performances of pure Zn and Zn-0.4Mn alloy exposed in marine environment (Qingdao, east of China) have been studied after exposure for three years. Pitting corrosion occurs on both pure Zn and Zn-0.4Mn with fewer and smaller pits on Zn-0.4Mn alloy as revealed by confocal scanning laser microscope (CSLM), which indicates that the addition of Mn can reduce the localized corrosion of Zn. Corrosion products formed on pure Zn and Zn-0.4Mn have been characterized by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), scanning electron microscopy (SEM) and electron probe micro-analyzer (EPMA). The main crystalline phases identified by XRD are Zn5(CO3)2(OH)6, Zn4SO4(OH)6and NaZn4Cl(OH)6SO4·6H2O, respectively. Small amounts of ZnO and Zn(OH)2are also found which mainly present on top surface of corrosion films as revealed by XPS. Combined results of XRD and EPMA disclose that Zn4SO4(OH)6and NaZn4Cl(OH)6SO4·6H2O are the main compounds inside the pits with Zn4SO4(OH)6locating at the pit bottom. The formation mechanism of corrosion products inside pits and the role of small Mn addition on localized corrosion of Zn have been discussed. Highlights► Addition of 0.4 wt.% Mn can significantly reduce localized corrosion of Zn after exposure in marine environment for three years. ► The mechanism of Mn addition to improve the atmospheric corrosion performance of zinc is that Mn can reduce the acidity inside droplets and pits. ► Zn4SO4(OH)6and NaZn4Cl(OH)6SO4·6H2O are the main compounds inside the pit with Zn4SO4(OH)6locating at the pit bottom.