Journal
CORROSION SCIENCE
Volume 53, Issue 11, Pages 3643-3650Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2011.07.008
Keywords
Mild steel; Polarization; EIS; Rust; Pitting corrosion; Oxygen reduction
Funding
- University of Western Ontario
- Canadian Natural Sciences and Engineering Research Council (NSERC, Ottawa)
Ask authors/readers for more resources
A corrosion mechanism has been developed to describe tubercle formation along pipeline steels during successive anaerobic-aerobic cycles. Small concentrations of O(2) under nominally anaerobic conditions can lead to the separation of anodes and cathodes. Under subsequent aerobic conditions localized corrosion is then promoted by O(2) reduction on the general magnetite-covered surface. Subsequently, the conversion of magnetite to maghemite passivates the general surface, and focuses corrosion within one major tubercle-covered pit. On switching from aerobic to anaerobic conditions, corrosion is temporarily supported by the galvanic coupling of lepidocrocite (gamma-FeOOH) reduction (to gamma-Fe-OH center dot OH) to steel dissolution primarily within the tubercle-covered pit. (C) 2011 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available