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

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

• PROCESS AND PRODUCT TECHNOLOGY • Previous Articles Next Articles

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)

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

通讯作者: XU Chunchun,E-mail:chunchunxu@263.net
基金资助:
China Petroleum & Chemical Corporation(306021)

Abstract

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

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

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.

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.

References

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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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