This investigation was designed to study whether strain aging could assist localized corrosion of pipeline steels under realistic conditions, which is an unsolved problem in the evaluation of strain-aging-induced stress corrosion cracking of pipeline steels in the field. It was found that the corrosion severity was significantly aggravated after strain aging because of the increase in yield strength and the transformation of oxide scales on the steel surface. These variations caused by strain aging lead to lesser exfoliation and longer life of the oxide scales under cyclic loading in air and during subsequent corrosion exposure, which enhances the galvanic corrosion between oxide scales and the steel substrate. The composition of oxide scales, mechanical properties of steels, and magnitude of the stress cycles, which could all impact localized corrosion, were studied. The findings of this investigation suggest that the severe localized corrosion leading to crack initiation is a vital factor for the higher SCC susceptibility of pipeline steels associated with strain aging, in addition to the enhanced hydrogen embrittlement as usually believed.
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Research Article|
March 23 2021
Strain-aging-assisted localized corrosion of a mill-scaled X-65 pipeline steel
Shidong Wang
;
S Wang Department of Chemical and Materials Engineering,
University of Alberta
, Edmonton, Alberta, T6G 2R3, Canada
Correspondence: Shidong Wang, Email: shidong@ualberta.ca
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Lyndon Lamborn
;
Lyndon Lamborn
L Lamborn
Enbridge Pipelines Inc
, Edmonton, Alberta, Canada
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Karina Chevil
;
Karina Chevil
Chevil
TC Energy Corporation
, Calgary, Alberta, Canada
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Erwin Gamboa
;
Erwin Gamboa
E Gamboa
TC Energy Corporation
, Calgary, Alberta, Canada
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Weixing Chen
Weixing Chen
W Chen
University of Alberta
, Edmonton, Alberta, Canada
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CORROSION 3721:.
Article history
Received:
October 22 2020
Revision Received:
January 26 2021
Accepted:
March 23 2021
Citation
Shidong Wang, Lyndon Lamborn, Karina Chevil, Erwin Gamboa, Weixing Chen; Strain-aging-assisted localized corrosion of a mill-scaled X-65 pipeline steel. CORROSION 2021; 3721:. doi: https://doi.org/10.5006/3721
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