Investigation of the evolution of an iron carbonate layer and its effect on localized corrosion of X65 carbon steel in CO2 corrosion environments

The general and localized corrosion of X65 carbon steel in CO2-saturated environments conducive to iron carbonate (FeCO3) formation has been studied using electrochemical measurements, together with post-test surface analysis. This research offers new insights into the evolution of FeCO3 layer and i...

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Bibliographic Details
Published in:Corrosion science 2021-11, Vol.192, p.109849, Article 109849
Main Authors: Lazareva, Anastasija, Owen, Joshua, Vargas, Silvia, Barker, Richard, Neville, Anne
Format: Article
Language:English
Subjects:
A. carbon steel
A. mild steel
B. SEM
B. XRD
C. crevice corrosion
C. pitting corrosion
Carbon dioxide
Carbon steel
Carbon steels
Corrosion
Corrosion effects
Corrosion environments
Crevice corrosion
Evolution
High strength low alloy steels
Iron carbonate
Localized corrosion
Pitting (corrosion)
Surface analysis (chemical)
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Summary:The general and localized corrosion of X65 carbon steel in CO2-saturated environments conducive to iron carbonate (FeCO3) formation has been studied using electrochemical measurements, together with post-test surface analysis. This research offers new insights into the evolution of FeCO3 layer and its link to the subsequent initiation and propagation of localized corrosion. We identify crevice-like regions forming at boundaries/edges of the FeCO3 crystals, which constitute the crystalline layer, where small cavities filled with electrolyte are restricted between developing crystals. It is apparent that such crevice-like features act as precursors to the localized/pitting corrosion on carbon steel over longer durations. The raw/processed data required to reproduce these findings cannot be shared at this time as the data also forms part of an ongoing study. [Display omitted] •Crevice-like features at early stages of FeCO3 evolution.•Preferential corrosion around FeCO3 crystals.•Initiation of localized corrosion took place without chemical and/or mechanical dissolution of the FeCO3 layer.•Electrolyte pockets trapped between/below FeCO3 crystals.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2021.109849