Stress corrosion cracking of X80 pipeline steel exposed to high pH solutions with different concentrations of bicarbonate

被引：0

作者：

Lin Fan ^{[1
]}

Cui-wei Du ^{[1
]}

Zhi-yong Liu ^{[1
]}

Xiao-gang Li ^{[1
]}

机构：

[1] School of Materials Science and Engineering, University of Science and Technology Beijing

来源：

International Journal of Minerals Metallurgy and Materials | 2013年 / 20卷 / 07期

关键词：

pipeline steel; stress corrosion cracking; bicarbonate; passive films;

D O I：

暂无

中图分类号：

TG172.9 [其他腐蚀];

学科分类号：

080503 ;

摘要：

Susceptibilities to stress corrosion cracking (SCC) of X80 pipeline steel in high pH solutions with various concentrations of HCO3- at a passive potential of -0.2 V vs. SCE were investigated by slow strain rate tensile (SSRT) test. The SCC mechanism and the effect of HCO3- were discussed with the aid of electrochemical techniques. It is indicated that X80 steel shows enhanced susceptibility to SCC with the concentration of HCO3- increasing from 0.15 to 1.00 mol/L, and the susceptibility can be evaluated in terms of current density at -0.2 V vs. SCE. The SCC behavior is controlled by the dissolution-based mechanism in these circumstances. Increasing the concentration of HCO3- not only increases the risk of rupture of passive films but also promotes the anodic dissolution of crack tips. Besides, little susceptibility to SCC is found in dilute solution containing 0.05 mol/L HCO3- for X80 steel. This can be attributed to the inhibited repassivation of passive films, manifesting as a more intensive dissolution in the non-crack tip areas than at the crack tips.

引用

页码：645 / 652

页数：8

共 15 条

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