Hydrogen interaction characteristics of a Cr2O3Y2O3 coating formed on stainless steel in an ultra-low oxygen environment |
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| Affiliation: | 1. The Key Laboratory of Advanced Materials, School of Materials Science and Engineering, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Tsinghua University, Beijing 100084, China;2. School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China;3. Department of Mechanical Systems Engineering, Faculty of Engineering, Hiroshima Institute of Technology, 2-1-1 Miyake, Saeki-ku, Hiroshima 731-5193, Japan;1. Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China;2. Chinese Academy of Engineering Physics, P.O. Box 919-71, Mianyang, Sichuan 621907, China;3. Department of Chemistry, Tsinghua University, Beijing 100084, China;1. China Academy of Engineering Physics, Mianyang 621900, China;2. College of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230031, China;1. Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China;2. Chinese Academy of Engineering Physics, P.O. Box 919-71, Mianyang, Sichuan, 621907, China;1. Lab of Advanced Materials, School of Materials Sciences and Engineering, Tsinghua University, Beijing 100084, China;2. Institute of Nuclear Fuel and Materials, State Power Investment Corporation Central Research Institute, Beijing 102209, China;3. Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang 621900, China |
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| Abstract: | Ceramics are the most promising candidates for tritium permeation barriers for fusion reactors due to their high thermal and chemical stabilities and low hydrogen isotope permeation reduction factors. However, hydrogen embrittlement and a large number of defects in ceramic coatings are new challenges for first wall materials in nuclear reactors. To address this issue, a new Cr2O3 Y2O3 coating with a thickness of about 100 nm was synthesized and placed in an ultra-low oxygen partial pressure (8 × 10−20 Pa) environment, in which a compact CrY alloy coating was successfully deposited on the stainless-steel substrate by pulsed electrochemical deposition. The interactions between the coating and hydrogen plasma were comprehensively analyzed and compared via surface analysis techniques, including TEM, XPS and electrochemical impedance spectroscopy (EIS). The mechanical properties of the coating before and after hydrogen permeation were studied by tensile testing. It was found that this ceramic coating effectively reduced the defect concentration and retained a high protective performance upon hydrogen exposure. Therefore, this new Cr2O3Y2O3 coating has potential as a promising hydrogen permeation barrier. |
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| Keywords: | Hydrogen permeation barrier Defect Tensile testing |
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