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

Gao, Z, Kulczyk-Malecka, J, Liu, H, Kelly, P ORCID logoORCID: 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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File will be available on: 21 April 2023.

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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.

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