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

Research output: Contribution to journal › Article › peer-review

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	E-pub ahead of print - 21 Apr 2022

Keywords

Amorphous SiAlN
NaCl attack
Sodium Silicate
Degradation

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GaoZ2022amorphous
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title = "An amorphous SiAlN barrier coating against NaCl attack in humid air at elevated temperature",

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.",

keywords = "Amorphous SiAlN, NaCl attack, Sodium Silicate, Degradation",

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

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T1 - An amorphous SiAlN barrier coating against NaCl attack in humid air at elevated temperature

AU - Gao, Zhaohe

AU - Kulczyk-Malecka, Justyna

AU - Liu, Han

AU - Kelly, Peter

AU - Xiao, Ping

AU - Chiu, Yu-Lung

PY - 2022/4/21

Y1 - 2022/4/21

N2 - 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.

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.

KW - Amorphous SiAlN

KW - NaCl attack

KW - Sodium Silicate

KW - Degradation

U2 - 10.1016/j.corsci.2022.110321

DO - 10.1016/j.corsci.2022.110321

M3 - Article

VL - 203

JO - Corrosion Science

JF - Corrosion Science

SN - 0010-938X

M1 - 110321

ER -

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

Abstract

Keywords

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