The formation of pitting under dynamic DC interference: Corrosion product film defects or passive film induction

被引：9

作者：

Yu, Xin ^{[1
,2
]}

Liu, Jianguo ^{[1
,2
]}

Jiang, Hailei ^{[3
]}

Cui, Gan ^{[1
,2
]}

Luo, Xiaoming ^{[1
,2
]}

机构：

[1] China Univ Petr East China, Coll Pipeline & Civil Engn, 66 Changjiang West Rd, Qingdao 266580, Peoples R China

[2] Shandong Key Lab Oil & Gas Storage & Transportat S, Qingdao 266580, Peoples R China

[3] Huangdao Natl Oil Reserve Ctr Co Ltd, 577 Qingshui River, Qingdao 266426, Peoples R China

来源：

CORROSION SCIENCE | 2024年 / 231卷

基金：

中国国家自然科学基金;

关键词：

Dynamic DC interference; Corrosion product film; Passive film; Pitting mechanism; Pipeline steel; X80 PIPELINE STEEL; STRAY CURRENT; X70; STEEL; X65; ALTERNATING-CURRENT; ALKALINE-SOLUTIONS; STAINLESS-STEEL; NACL SOLUTION; CARBON-STEEL; PH;

D O I：

10.1016/j.corsci.2024.111961

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The cause of pitting under dynamic DC interference is unclear. This paper studies the mechanisms of pitting in simulated solutions under neutral and alkaline conditions using weight loss, electrochemical testing, and microscopic characterization. The results indicate that the metal mainly undergoes active corrosion in the neutral solution, and the formation of millimeter-scale pits is due to local defects in corrosion products. Metals in the alkaline solution undergo passive corrosion, resulting in micro-scale pits. Initially, stable pits form at damaged areas of the passivation film. Then, pits can grow rapidly under self-catalysis, with the growth rate surpassing other surface locations.

引用

页数：13

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