期刊
CORROSION SCIENCE
卷 173, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2020.108755
关键词
Alloy; Oxidation; Chromium-based oxide; Diffusion; Transmission electron microscope
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2019R1A2C1088535]
The high-temperature oxidation behaviour of CoCrNi was investigated over different exposure times (6, 12, 24, and 48 h) at 900-1100 degrees C. The initial phase identification indicated that the tendency of oxide formation at 1100 degrees C was different after each exposure time. Microstructure observation demonstrated that Cr2O3 was mainly present at the interface of the oxide layer/base alloy, whereas CoCr2O4 and NiCr2O4 were identified near the outer oxide layer. The oxidation mechanism and the corresponding activation energy of CoCrNi were explained based on the slow diffusion of the Co, Cr, and Ni elements and the vacancy accumulation near the surface.
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