NDLI: Corrosion and Stress Corrosion Cracking Behavior of X70 Pipeline Steel in a CO$

Content Provider	Springer Nature Link
Author	Zhang, L. Li, X.G. Du, C.W. Cheng, Y.F.
Copyright Year	2008
Abstract	The electrochemical corrosion and stress corrosion cracking (SCC) behaviors of X70 pipeline steel in CO$_{2}$-containing solution were studied by electrochemical measurements, slow strain rate tensile tests, and surface characterization. The results found that the electrochemical corrosion of X70 steel in aerated, alkaline solution is an activation-controlled process, and a stable passivity cannot develop on steel. Corrosion rate of the steel increases with the CO$_{2}$ partial pressure. The enhanced anodic dissolution due to the additional cathodic reaction in the presence of CO$_{2}$, rather than the film-formation reaction, dominates the corrosion process. The mass-transfer step through FeCO$_{3}$ deposit is the rate-controlling step in corrosion of the steel. The susceptibility of steel to SCC and the fracture brittleness increase with the CO$_{2}$ partial pressure. The enhanced fracture brittleness is attributed to the evolution and penetration of hydrogen atoms into the steel, contributing to crack propagation. The formed deposit layer is not effective in reducing hydrogen permeation due to the loose, porous structure.
Starting Page	319
Ending Page	323
Page Count	5
File Format	PDF
ISSN	10599495
Journal	Journal of Materials Engineering and Performance
Volume Number	18
Issue Number	3
e-ISSN	15441024
Language	English
Publisher	Springer US
Publisher Date	2008-08-25
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	CO$_{2}$ corrosion pipeline steel stress corrosion cracking Engineering Design Quality Control, Reliability, Safety and Risk Tribology, Corrosion and Coatings Materials Science Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science Mechanical Engineering

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