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Hydrogen Permeation Properties of Alumina Coating on 316L Stainless Steel

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Author(s): LI Shuai, HE Di, LIU Xiao-Peng, ZHANG Chao, WANG Shu-Mao, YU Qing-He, QIU Hao-Chen, JIANG Li-Jun

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 28;
Issue: 7;
Start page: 775;
Date: 2013;
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Keywords: alumina; MOCVD; hydrogen permeation; 316L stainless steel

ABSTRACT
Alumina coatings were deposited on 316L stainless steel by metal organic chemical vapor deposition (MOCVD). The phase and microstructure of coatings were examined by XRD and SEM, and the hydrogen permeation behavior of coating was measured by a gas-phase hydrogen permeation apparatus. The results show that the alumina coating is amorphous after thermal annealing at 973 K, and the coating is smooth, intact and 190 nm of thickness. The hydrogen permeation pressure exponents of the coating are 0.56£­0.78, which indicates the hydrogen permeation of coating is surface and diffusion limited. The apparent hydrogen permeability of the coating isP = 1.99×10-6 exp(-117×103/RT) mol/(m·s·Pa1/2). The permeation activation energy of the coating is 117 kJ/mol, which is much higher than that of 316L stainless steel with value of 66.6 kJ/mol. Thus, the alumina coating effectively suppresses the hydrogen permeation in 316L. Furthermore, the hydrogen permeation reduction factors (PRF) of the alumina coating on 316L are 59–119 at temperatures 873–973 K, and the alumina coating offers excellent hydrogen permeation suppression performance.
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