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| Oxidation Behavior of Ternary Alloys Co-20Ni-3Al and Co-20Ni-5Al in 105 Pa O2 Atmosphere at 800-1000 ℃ |
REN Yanjie1, LV Yunlei1, DAI Ting1, GUO Xiaohui2, CHEN Jian1, ZHOU Libo1, QIU Wei1, NIU Yan1( ) |
1. Department of Energy and Power Engineering, Changsha University of Science and Technology, Changsha 410076, China
2. School of Materials & Engineering, University of Science & Technology of China, Shenyang 110016, China |
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Cite this article:
REN Yanjie, LV Yunlei, DAI Ting, GUO Xiaohui, CHEN Jian, ZHOU Libo, QIU Wei, NIU Yan. Oxidation Behavior of Ternary Alloys Co-20Ni-3Al and Co-20Ni-5Al in 105 Pa O2 Atmosphere at 800-1000 ℃. Journal of Chinese Society for Corrosion and protection, 2022, 42(6): 995-1001.
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Abstract The oxidation behavior of two ternary alloys Co-20Ni-xAl (x=3, 5, mass fraction, %) was studied in 105 Pa O2 at 800-1000 ℃ for 20 h. After oxidation, the two alloys all formed double-layered external scales composed of an outer layer of CoO (with a small amount of NiO) and an inner layer of mixtures CoO and spinels, usually followed by a region of internal oxidation of Al. The oxidation rate of the alloys increases with the increasing temperature. When the increase of Al content from 3% to 5%, the oxidation rate of Co-Ni-Al alloys is reduced, however, the Al content of 5% is not yet sufficient to ensure the formation of a protective external alumina scale on the alloy. In fact, the experimental results may be well interpreted by the prediction according to the theoretical mode related to the reaction of binary alloy with single oxidant by simplifying the ternary Co-Ni-Al alloys as binary (Co-Ni)-Al alloys.
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Received: 29 September 2021
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| Fund: National Natural Science Foundation of China(51771034);National Natural Science Foundation of China(52171066);Natural Science Foundation of Hunan Province(2020JJ4610);Graduate Scientific Research Innovation Project of Hunan Province(CX20200871);Graduate Scientific Research Innovation Project of CSUST(CX2020SS66) |
About author: NIU Yan, E-mail: yniu@csust.edu.cn
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