An interesting oxidation phenomenon of Cr coatings on Zry-4 substrates in high temperature steam environment

被引:149
作者
Han, Xiaochun [1 ]
Xue, Jiaxiang [2 ]
Peng, Shuming [1 ]
Zhang, Haibin [1 ]
机构
[1] China Acad Engn Phys, Inst Nucl Phys & Chem, Innovat Res Team Adv Ceram, Mianyang 621900, Sichuan, Peoples R China
[2] China Nucl Power Technol Res Inst Co Ltd, Dept ATF R&D, Shenzhen, Peoples R China
基金
中国国家自然科学基金;
关键词
Cr coatings; High temperature steam oxidation; Reduction of Cr2O3; BEHAVIOR;
D O I
10.1016/j.corsci.2019.05.017
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Cr coatings deposited on zircaloy-4 substrates have been oxidized in high temperature steam environment from 1000 degrees C to 1200 degrees C in this study. It has been reported by many authors that Cr coatings have exhibited excellent oxidation resistance in steam environment because of the formation of a dense and adherent Cr2O3 layer on the surface. However, we have found that in the stage when the Cr coating has completely been oxidized and approached the coating-substrate interface, it is reduced by the Zr substrate and mostly transformed into a metallic Cr layer. The mechanisms of oxidation in this stage is therefore more interesting than generally assumed and we have proposed a new model based on the diffusion and redox reaction between Zr and Cr layers in high temperature steam environment.
引用
收藏
页码:117 / 124
页数:8
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