期刊
JOURNAL OF NUCLEAR MATERIALS
卷 505, 期 -, 页码 7-14出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnucmat.2018.03.053
关键词
Alumina-forming alloys; Electron microscopy; High temperature corrosion; Oxidation; Supercritical water
资金
- Atomic Energy Council of Taiwan [10511053L]
- Ministry of Science and Technology of Taiwan [105-2221-E-007-024-MY3]
Corrosion of cladding materials in supercritical water (SCW) environment is a key reliability issue for the safety of nuclear power plant. In this study, we propose to use the pre-oxidized treatment to provide better corrosion resistance of cladding materials in the SCW environment. The nickel-based superalloy HR-224 was first pre-oxidized in flowing air at 982 degrees C for 100 h to establish a continuous and dense scales and then exposed in the SCW environment with high oxygen content (8.3 ppm) at 700 degrees C and 24.8 MPa for cyclic oxidation testing up to 1300 h. The pre-oxidized samples exhibit better corrosion resistance than as-received samples in the SCW environment. After pre-oxidizing process, triple scales, Ni(Cr, Fe)(2)O-4 spinel/Cr2O3/alpha-Al2O3 were observed, and the growth of inner alpha-Al2O3 layer is predominant in the SCW environment. The a-Al2O3 layer in pre-oxidized samples was found to effectively decrease outward migration of metal ions in Alloy HR-224 and thus provides better corrosion resistance than as-received samples in SCW environment. (C) 2018 Elsevier B.V. All rights reserved.
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