Effect of Strain and Chloride Concentration on Pitting Susceptibility for Type 304 Austenitic Stainless Steel

›› 2008, Vol. 16 ›› Issue (2): 314-319.

Effect of Strain and Chloride Concentration on Pitting Susceptibility for Type 304 Austenitic Stainless Steel

吕国诚¹, 程海东¹, 许淳淳¹, 何宗虎²

1. College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
2. Department of Chemical, Biomedical, and Materials Engineering, Stevens Institute of Technology, Hoboken, New Jersey 07030, USA

收稿日期:2007-10-19 修回日期:2008-01-11 出版日期:2008-04-28 发布日期:2008-04-28
通讯作者: XU Chunchun,E-mail:chunchunxu@263.net
基金资助:
China Petroleum & Chemical Corporation(306021)

Effect of Strain and Chloride Concentration on Pitting Susceptibility for Type 304 Austenitic Stainless Steel

LÜ Guocheng¹, CHENG Haidong¹, XU Chunchun¹, HE Zonghu²

1. College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
2. Department of Chemical, Biomedical, and Materials Engineering, Stevens Institute of Technology, Hoboken, New Jersey 07030, USA

Received:2007-10-19 Revised:2008-01-11 Online:2008-04-28 Published:2008-04-28
Supported by:
China Petroleum & Chemical Corporation(306021)

摘要/Abstract

摘要： The effects of strain and chloride concentration on pitting susceptibility for type 304 stainless steel were studied in situ using the electrochemical technology under constant strain.The impact factor f_ε was brought forward to value the effect of strain on pitting.The pitting behaviors of type 304 stainless steel in various chloride concentrations under the strain levels 0%,10%,and 30%were investigated.Potentiostatic polarization technology was used to study how the chloride concentration affected corrosion current density.The results indicated that f_ε increased substantially and pitting potential varied remarkably when chloride concentration was over 90 mg·L^-1. Un-der the three levels of strain mentioned above,when chloride concentration was below 463 mg·L^-1,121 mg·L^-1,and 98 mg·L^-1,respectively,the pitting potential shifted towards positivity and,the passive film became more stable. When the strain was below 10%,the pitting susceptibility of type 304 stainless steel varied greatly as strain increased,whereas the susceptibility only changed a little when the strain was over 10%

关键词: 304 stainless steel, strain, pitting corrosion, chloride concentration

Abstract: The effects of strain and chloride concentration on pitting susceptibility for type 304 stainless steel were studied in situ using the electrochemical technology under constant strain.The impact factor f_ε was brought forward to value the effect of strain on pitting.The pitting behaviors of type 304 stainless steel in various chloride concentrations under the strain levels 0%,10%,and 30%were investigated.Potentiostatic polarization technology was used to study how the chloride concentration affected corrosion current density.The results indicated that f_ε increased substantially and pitting potential varied remarkably when chloride concentration was over 90 mg·L^-1. Un-der the three levels of strain mentioned above,when chloride concentration was below 463 mg·L^-1,121 mg·L^-1,and 98 mg·L^-1,respectively,the pitting potential shifted towards positivity and,the passive film became more stable. When the strain was below 10%,the pitting susceptibility of type 304 stainless steel varied greatly as strain increased,whereas the susceptibility only changed a little when the strain was over 10%

Key words: 304 stainless steel, strain, pitting corrosion, chloride concentration

吕国诚, 程海东, 许淳淳, 何宗虎. Effect of Strain and Chloride Concentration on Pitting Susceptibility for Type 304 Austenitic Stainless Steel[J]. , 2008, 16(2): 314-319.

LÜ Guocheng, CHENG Haidong, XU Chunchun, HE Zonghu. Effect of Strain and Chloride Concentration on Pitting Susceptibility for Type 304 Austenitic Stainless Steel[J]. , 2008, 16(2): 314-319.

参考文献

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Effect of Strain and Chloride Concentration on Pitting Susceptibility for Type 304 Austenitic Stainless Steel

Effect of Strain and Chloride Concentration on Pitting Susceptibility for Type 304 Austenitic Stainless Steel

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