Molecular mechanism of the sulfide corrosion of α-iron

Murowchick, J.B., Oldroyd, A. and Rickard, D. ORCID: https://orcid.org/0000-0002-4632-5711 2024. Molecular mechanism of the sulfide corrosion of α-iron. Corrosion Science 231 , 111949. 10.1016/j.corsci.2024.111949 Item availability restricted.

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Abstract

The reaction between aqueous sulfide and α-iron at ambient temperatures produces a ferrous monosulfide with a tetragonal mackinawite structure, FeSm. The reaction is epitactic with the Fe structure in FeSm being similar, but not identical, to the Fe structure in α-iron. The strain induced by these small structural differences results in spallation of the FeSm product. This causes the exposure of new α-iron sites and determines the rate of sulfide corrosion of α-iron. The results provide a fundamental explanation for the real-world observation that pitting of steel pipes in sulfide environments is a major source of corrosion and pipe failure.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Earth and Environmental Sciences
Publisher:	Elsevier
ISSN:	0010-938X
Date of First Compliant Deposit:	3 April 2024
Date of Acceptance:	23 February 2024
Last Modified:	10 Nov 2024 20:30
URI:	https://orca.cardiff.ac.uk/id/eprint/167671

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