Abstract
The corrosion behavior of CrC and Ti-Al-C coatings in lithiated/borated water was studied, and the influence of hydrothermal corrosion on coating chemical stability in pressurized steam was investigated. In lithiated/borated water, CrC coating formed a protective Cr2O3 layer, and the NiAl intermediate layer remained unoxidized. The diffusion degree of O2− differed in the depth direction of the Ti-Al-C coating. O2− penetrated into the NiAl intermediate layer, facilitating oxidation and cracking. CrC coating was found to be more resistant to steam oxidation than Ti-Al-C coating. Oxidation stress led to partial delamination of the oxide scale on CrC coating, while Ti-Al-C coating suffered intergranular oxidation and exhibited microscale facets under the selective attack of steam.
Published Version
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