CrO2(OH)2 volatilization rate and oxidation behavior prediction of the NiCr coating in air-H2O environment at 650

•4000 h oxidation kinetic and lifetime prediction of NiCr coating is established.•Kinetic parameters and volatilization rate of CrO2(OH)2 is calculated.•Actual oxidation kinetic considering the volatilization of CrO2(OH)2 is built. The volatilization rate and lifetime prediction of the NiCr coatings...

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Bibliographic Details
Published in:Corrosion science 2021-04, Vol.182, p.109303, Article 109303
Main Authors: Huang, Wenlang, Huang, Taihong, Song, Peng, Chen, Rong, Zheng, Biju, Wang, Chengxi, Li, Chao, Lu, Jiansheng
Format: Article
Language:English
Subjects:
A. Coating
B. Kinetic parameters
B. Weight loss
C. Oxidation
Coatings
Gas transport
Oxidation
Transport theory
Vaporization
Viscous flow
Water vapor
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Summary:•4000 h oxidation kinetic and lifetime prediction of NiCr coating is established.•Kinetic parameters and volatilization rate of CrO2(OH)2 is calculated.•Actual oxidation kinetic considering the volatilization of CrO2(OH)2 is built. The volatilization rate and lifetime prediction of the NiCr coatings produced by high-velocity oxygen-fuel were investigated at 650 °C in air containing 20 % water vapor. Water vapor could significantly accelerate the consumption of Cr which reduced the service time of the coatings. Oxidation kinetic rate of the NiCr coating and volatilization rate of the CrO2(OH)2 were calculated using classical gas transport theory in the viscous-flow regime. According to the practical oxidation kinetic rate, we built a relationship to predict the lifetime of the NiCr coating.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2021.109303