Synergistic Contribution of Chloride and Bicarbonate Ions to Pitting Corrosion Behavior of Carbon Steel

被引：26

作者：

Zhang, Shaohua ^{[1
]}

Hou, Lifeng ^{[1
]}

Du, Huayun ^{[1
]}

Wei, Huan ^{[1
]}

Liu, Baosheng ^{[2
]}

Wei, Yinghui ^{[1
,2
]}

机构：

[1] Taiyuan Univ Technol, Coll Mat Sci & Engn, Taiyuan 030024, Shanxi, Peoples R China

[2] Taiyuan Univ Sci & Technol, Coll Mat Sci & Engn, Taiyuan 030024, Shanxi, Peoples R China

来源：

CORROSION | 2019年 / 75卷 / 09期

关键词：

carbon steel; Cl-; HCO3-; electrochemical characterizations; pitting corrosion; X70 PIPELINE STEEL; CO2; CORROSION; MILD-STEEL; ELECTROCHEMICAL NOISE; PASSIVITY BREAKDOWN; INTERNAL CORROSION; SCALE FORMATION; GAS-PIPELINES; IN-SITU; IRON;

D O I：

10.5006/3195

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Pitting corrosion behavior of AISI 1020 carbon steel exposed to natural aeration and solutions containing Cl- or/and HCO3- was investigated using electrochemical and surface characterizations. The results reveal a synergistic effect of HCO3- and Cl- on pitting corrosion behavior of carbon steel. HCO3- serves as the main source of hydrogen and acts as a reactant to promote the formation of FeCO3/Fe2O3/Fe3O4 films as corrosion product, which are a prerequisite for pitting initiation and propagation. Cl- contributes to the catalytic dissolution of the Fe matrix, film breakdown, and diffusion within the occluded cavity, thereby significantly enhancing the pitting corrosion of carbon steel.

引用

页码：1034 / 1043

页数：10

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