The role of Ca2+ ions on Ca/Fe carbonate products on X65 carbon steel in CO2 corrosion environments at 80 and 150 °C

Abstract

The role of Ca2+ ions on the corrosion behaviour of carbon steel in CO2-corrosion environments was evaluated at 80 °C and 150 °C. In the presence of Ca2+ ions there was a more significant effect on the general corrosion rate at the lower temperature of 80 °C where the protection afforded by the corrosion product layer was reduced. The extent of localised/pitting corrosion increased through the addition of Ca2+ ions indicating that Ca2+ plays a role in promoting localised corrosion. XRD based calculations, along with focused ion beam EDX-line scans confirmed that the mixed Ca/Fe carbonates precipitated with concentration gradients across their thicknesses.

Metadata

Authors/Creators:	Shamsa, A Barker, R https://orcid.org/0000-0002-5106-6929 Hua, Y Barmatov, E Hughes, TL Neville, A https://orcid.org/0000-0002-6479-1871
Copyright, Publisher and Additional Information:	© 2019 Elsevier Ltd. All rights reserved. This is an author produced version of a paper published in Corrosion Science. Uploaded in accordance with the publisher's self-archiving policy.
Keywords:	CO2 corrosion; High temperature; Iron carbonate; Calcium carbonate; Mixed carbonate
Dates:	Accepted: 10 May 2019 Published (online): 15 May 2019 Published: 1 August 2019
Institution:	The University of Leeds
Academic Units:	The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Mechanical Engineering (Leeds) > Institute of Functional Surfaces (Leeds)
Depositing User:	Symplectic Publications
Date Deposited:	16 May 2019 13:31
Last Modified:	15 May 2020 00:38
Status:	Published
Publisher:	Elsevier
Identification Number:	https://doi.org/10.1016/j.corsci.2019.05.006