The stress corrosion cracking (SCC) of pipeline steels in coating disbondment chemistry (near neutral pH solution) was studied by using slow strain rate tests (SSRT), polarization techniques, SEM and SIMS (secondary ion mass spectroscope). It was found that SCC susceptibility increased as the applied electrochemical potential and strain rates decreased. Hydrogen (H) precharging or addition of CO2 facilitated the process of SCC, suggesting that dissolution and hydrogen ingress are involved in the cracking process. SIMS analysis showed that hydrogen could diffuse into steels around the crack tip during the SCC process, which would facilitate the dissolution rate of the steel and increase SCC susceptibility. A mechanism was proposed which shows that hydrogen enhances anodic dissolution type of SCC in dilute aqueous solution. A thermodynamic analysis of the SCC process was carried out, and was found to be consistent with the experimental results.
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1998 2nd International Pipeline Conference
June 7–11, 1998
Calgary, Alberta, Canada
Conference Sponsors:
- Pipeline Division
ISBN:
978-0-7918-4022-1
PROCEEDINGS PAPER
Hydrogen Facilitated Anodic Dissolution Type Stress Corrosion Cracking of Pipeline Steels in Coating Disbondment Chemistry
W. Yu
W. Yu
The University of Calgary
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Scott X. Mao
The University of Calgary
J. L. Luo
University of Albert
B. Gu
The University of Calgary
W. Yu
The University of Calgary
Paper No:
IPC1998-2056, pp. 485-492; 8 pages
Published Online:
October 21, 2016
Citation
Mao, SX, Luo, JL, Gu, B, & Yu, W. "Hydrogen Facilitated Anodic Dissolution Type Stress Corrosion Cracking of Pipeline Steels in Coating Disbondment Chemistry." Proceedings of the 1998 2nd International Pipeline Conference. Volume 1: Risk Assessment and Management; Emerging Issues and Innovative Projects; Operations and Maintenance; Corrosion and Integrity Management. Calgary, Alberta, Canada. June 7–11, 1998. pp. 485-492. ASME. https://doi.org/10.1115/IPC1998-2056
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