Derivation of the mechanistic relationship of pit initiation on pipelines resulting from cathodic protection potential fluctuations

被引：15

作者：

Dai, Mingjie ^{[1
]}

Liu, Jing ^{[1
]}

Huang, Feng ^{[1
]}

Hu, Qian ^{[1
]}

Cao, Chengsi ^{[1
]}

Cheng, Y. Frank ^{[2
]}

机构：

[1] Wuhan Univ Sci & Technol, State Key Lab Refractories & Met, Wuhan 430081, Hubei, Peoples R China

[2] Univ Calgary, Dept Mech Engn, Calgary, AB T2N 1N4, Canada

来源：

CORROSION SCIENCE | 2020年 / 163卷 / 163期

基金：

中国国家自然科学基金;

关键词：

Carbon steel; Polarization; SEM; Cathodic protection; PITTING CORROSION; STEEL;

D O I：

10.1016/j.corsci.2019.108226

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this work, a square wave polarization (SWP) technique was used to simulate the cathodic protection (CP) potential fluctuations on an API X100 pipeline steel to investigate the effect of potential fluctuations on pit initiation. The derived numerical relationship between the potential of the double-charge layer at the steel/solution interface and the CP potential fluctuation is consistent with the testing results. When the upper potential of the SWP potential is shifted positively (or negatively) while the lower potential is fixed, the potential of the double-charge layer linearly increases (or decreases), causing the increase (or decrease) of the pit density.

引用

页数：6

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