Journal
CORROSION SCIENCE
Volume 192, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2021.109805
Keywords
ATF cladding; Cr coating; High-temperature steam oxidation; Hydrogen release; Microstructural evolution; Failure behavior
Funding
- China Scholarship Council, China [201906280379]
- HGF program NUSAFE in Karlsruher Institut fur Technologie, Germany
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This study investigated the transient oxidation behavior of magnetron-sputtered chromium-coated Zircaloy-4 in steam up to 1600 degrees C, revealing that coating failure and rapid oxidation occurred at 1300-1400 degrees C due to various factors such as thickness decrease of the outer dense Cr2O3 scale and phase transformation of ZrO2-x to cubic ZrO2-y.
The transient oxidation behavior of magnetron-sputtered chromium-coated Zircaloy-4 was studied in steam up to 1600 degrees C, and the microstructural evolution of the coating-substrate system after oxidation was investigated. Coating failure and corresponding rapid oxidation of coating and substrate occurred at 1300-1400 degrees C. It was mainly caused by the thickness decrease of the outer dense Cr2O3 scale, the Zr-Cr eutectic reaction, the Zr-Cr interdiffusion, and the precipitation of ZrO2 along unoxidized Cr grain boundaries. The phase transformation of tetragonal ZrO2-x to cubic ZrO2-y increased the oxidation rate of the Zircaloy-4 substrate at similar to 1500 degrees C through the higher oxygen diffusion coefficient in the cubic phase.
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