期刊
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
卷 24, 期 11, 页码 4400-4408出版社
SPRINGER
DOI: 10.1007/s11665-015-1697-5
关键词
electrochemical; pH; stress corrosion cracking; X70 pipeline steel
资金
- National Natural Science Foundation of China [51471034, 51131001]
- National Basic Research Program of China [2014CB643300]
In this work, effects of pH value on the electrochemical and stress corrosion cracking (SCC) behavior of X70 pipeline steel in the dilute bicarbonate solutions were investigated using electrochemical measurements, slow strain rate tensile tests and surface analysis techniques. Decrease of the solution pH from 6.8 to 6.0 promotes the anodic dissolution and cathodic reduction simultaneously. Further decrease of the pH value mainly accelerates the cathodic reduction of X70 pipeline steel. As a result, when the solution pH decreases form 6.8 to 5.5, SCC susceptibility decreases because of the enhancement of the anodic dissolution. When the solution pH decreases from 5.5 to 4.0, SCC susceptibility increases gradually because of the acceleration of cathodic reactions.
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