Electrochemical Behavior and Stress Corrosion Sensitivity of X70 Steel Under Disbonded Coatings in Korla Soil Solution

被引：12

作者：

Qian, Hongchang ^{[1
]}

Wang, Luntao ^{[1
]}

Wang, Huiru ^{[1
]}

Zheng, Wenru ^{[1
]}

Zhang, Dawei ^{[1
]}

Du, Cuiwei ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, Ctr Corros & Protect, Beijing 100083, Peoples R China

来源：

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2016年 / 25卷 / 11期

基金：

中国国家自然科学基金;

关键词：

disbonded coating; EIS; pipeline steel; stress corrosion cracking; SCANNING KELVIN PROBE; PIPELINE STEEL; CATHODIC PROTECTION; CARBONATE/BICARBONATE SOLUTION; MECHANISM; CRACKING; POLARIZATION; ENVIRONMENT;

D O I：

10.1007/s11665-016-2319-6

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The corrosion of X70 pipeline steel under a model disbonded coating was studied in a simulated solution of Korla soil by combining in situ electrochemical measurements at different locations in the crevice and stress corrosion cracking (SCC) sensitivity analyses in the corresponding simulated environments. The results from electrochemical impedance spectroscopy showed that the corrosion product resistance R (t) and charge transfer resistance R (ct) of X70 steel first increased and then decreased with increasing distance from the opening of the crevice in the disbonded coating. Scanning electron micrographs showed that pitting in the crevice became more severe at deeper locations in the crevice. Slow strain rate tests showed that the lowest SCC sensitivity of X70 steel was found at 15 cm away from the opening, and the highest SCC sensitivity was at the end of the crevice.

引用

页码：4657 / 4665

页数：9

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