An amorphous SiAlN barrier coating against NaCl attack in humid air at elevated temperature

Gao, Z, Kulczyk-Malecka, J, Liu, H, Kelly, P ORCID: https://orcid.org/0000-0003-1008-4941, Xiao, P and Chiu, YL (2022) An amorphous SiAlN barrier coating against NaCl attack in humid air at elevated temperature. Corrosion Science, 203. p. 110321. ISSN 0010-938X

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Abstract

Amorphous magnetron sputtered SiAlN films have been designed to prevent NaCl attack of Ti alloy substrates in high temperature humid air environments. Uncoated Ti alloys suffer severe degradation after exposure to NaCl deposits in humid air at 700 °C for 100 h, whereas SiAlN coating forms protective scale mainly consisting of sodium silicate in identical conditions. Amorphous sodium silicate exhibits fast Na+ diffusion rate and extremely slow O2- diffusion rate, but degradation of SiAlN takes place in presence of both O2- and Na+ species. Sodium silicate scale provides good protection for SiAlN due to slow diffusion of O2- through sodium silicate.

Item Type:	Article
Peer-reviewed:	Yes
Date Deposited:	28 Jun 2022 08:41
Publisher:	Elsevier
Additional Information:	This is an Author Accepted Manuscript of an article published in Corrosion Science by Elsevier.
Divisions:	Faculties > Science and Engineering Research Centres > Advanced Materials and Surface Engineering
Subject terms:	0905 Civil Engineering, 0912 Materials Engineering, 0913 Mechanical Engineering, Energy
URI:	https://e-space.mmu.ac.uk/id/eprint/629954
DOI:	https://doi.org/10.1016/j.corsci.2022.110321
ISSN	0010-938X

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