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

Zhaohe Gao; Justyna Kulczyk-Malecka; Han Liu; Peter Kelly; Ping Xiao; Yu-Lung Chiu

doi:10.1016/j.corsci.2022.110321

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

Zhaohe Gao, Justyna Kulczyk-Malecka, Han Liu, Peter Kelly, Ping Xiao, Yu-Lung Chiu

Metallurgy and Materials

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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.

Original language	English
Article number	110321
Number of pages	12
Journal	Corrosion Science
Volume	203
Early online date	21 Apr 2022
DOIs	https://doi.org/10.1016/j.corsci.2022.110321
Publication status	Published - 15 Jul 2022

Bibliographical note

Funding Information:
PX would like to acknowledge support from Royal Academy of Engineering and Rolls-Royce for the appointment of Rolls-Royce/Royal Academy of Engineering Research Chair in Advanced Coating Technology.

Publisher Copyright:
© 2022 Elsevier Ltd

Keywords

Amorphous SiAlN
NaCl attack
Sodium Silicate
Degradation

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering
General Materials Science

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GaoZ2022amorphousAccepted author manuscript, 3.69 MBLicence: Creative Commons: Attribution-NonCommercial-NoDerivs (CC BY-NC-ND)

Cite this

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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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AU - Gao, Zhaohe

AU - Kulczyk-Malecka, Justyna

AU - Liu, Han

AU - Kelly, Peter

AU - Xiao, Ping

AU - Chiu, Yu-Lung

N1 - Funding Information: PX would like to acknowledge support from Royal Academy of Engineering and Rolls-Royce for the appointment of Rolls-Royce/Royal Academy of Engineering Research Chair in Advanced Coating Technology. Publisher Copyright: © 2022 Elsevier Ltd

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

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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