Influence of inclusions on initiation of pitting corrosion and stress corrosion cracking of X70 steel in near-neutral pH environment

被引：176

作者：

Wang, Liwei ^{[1
]}

Xin, Juncheng ^{[2
]}

Cheng, Lianjun ^{[1
]}

Zhao, Kang ^{[1
]}

Sun, Baozhuang ^{[3
]}

Li, Junru ^{[1
]}

Wang, Xin ^{[2
]}

Cui, Zhongyu ^{[2
]}

机构：

[1] Qingdao Univ, Coll Electromech Engn, Qingdao 266071, Peoples R China

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

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

来源：

CORROSION SCIENCE | 2019年 / 147卷

基金：

中国国家自然科学基金;

关键词：

low alloy steel; SEM; pitting corrosion; stress corrosion; HYDROGEN-INDUCED CRACKING; PIPELINE STEEL; STAINLESS-STEEL; NONMETALLIC INCLUSIONS; IN-SITU; METALLURGICAL FACTORS; SULFIDE INCLUSIONS; CREVICE CORROSION; GRAIN-BOUNDARY; MNS INCLUSIONS;

D O I：

10.1016/j.corsci.2018.11.007

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In-situ 2D and 3D microscopic technologies are used to analyze the influence of inclusions on pitting and stress corrosion cracking initiation of X70 steel in near-neutral pH solution. The chemical dissolution of complex oxide inclusions or part of them induces corrosion pits. Circular protected region forms around Ds inclusions due to dissolution of CaS. The Si-enriched inclusions remain intact, but interstice forms at the inclusion/matrix interface due to the dissolution of the matrix. Both complex oxide inclusions and Si-enriched inclusions can induce initiation of SCC micro-cracks, but most of the micro-cracks are generated inside the ferrite grains.

引用

页码：108 / 127

页数：20