Anodic Dissolution Behavior of the Crack Tip of X70 Pipeline Steel in Near-Neutral pH Environment

被引：6

作者：

Cui, Zhongyu ^{[1
,2
]}

Wang, Liwei ^{[3
]}

Liu, Zhiyong ^{[1
,2
]}

Du, Cuiwei ^{[1
]}

Li, Xiaogang ^{[1
]}

Wang, Xin ^{[2
]}

机构：

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

[2] Ocean Univ China, Inst Mat Sci & Engn, Qingdao 266100, Peoples R China

[3] Qingdao Univ, Coll Elect Engn, Qingdao 266071, Peoples R China

来源：

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2016年 / 25卷 / 12期

基金：

中国国家自然科学基金;

关键词：

anodic dissolution; crack growth rate; crack tip; near-neutral pH; X70 pipeline steel; STRESS-CORROSION CRACKING; CARBONATE-BICARBONATE SOLUTION; GROWTH BEHAVIOR; STRAIN-RATE; STAINLESS-STEELS; HYDROGEN; MODEL; PROPAGATION; KINETICS; METALS;

D O I：

10.1007/s11665-016-2394-8

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this work, the anodic dissolution behavior of the fresh metal surface at crack tip of X70 steel in near-neutral pH environment was investigated using galvanic corrosion simulation method. The solution environment, strain, strain rate, hydrogen enrichment, and fresh metal surface at the crack tip were considered. Corrosion current of the specimen during fast stretching increased linearly with plastic strain. The increment and increase rate of the corrosion current during plastic deformation stage were dependent on the strain rate. Combining Faraday's law and crack tip strain rate equation, the crack growth rate (CGR) induced by the anodic dissolution of the fresh metal surface was calculated. Results show that CGR caused by anodic dissolution was roughly one order lower than that measured on the compact tensile specimen under cyclic load. This finding indicated that hydrogen embrittlement may play a dominate role in stress corrosion crack propagation of pipeline steels in near-neutral pH environment.

引用

页码：5468 / 5476

页数：9

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