| MATERIALS AND SUSTAINABLE DEVELOPMENT:GREEN MANUFACTURING AND PROCESSING OF MATERIALS |
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| Characterization and Preparation of Ni-Yb Alloy by Molten Salt Electrolysis in Fluoride Melt |
| WANG Xu, LIAO Chunfa, WANG Ruixiang, SUN Qiangcao
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| School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000 |
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Abstract Ni-Yb alloy was prepared by electrolysis of fluorine salt-oxide system with LiF-CaF2 as medium and Yb2O3 as raw material. Cyclic voltammetry was adopted to analyze the electrochemical behavior of Yb (Ⅲ) ions, and X-ray diffraction, scanning electron microscope and energy dispersive spectroscope were employed to characterize the components and phase composition of the Ni-Yb alloys. It can be found from the results that the Ni-Yb alloy was successfully prepared by 3 hours’ electrolysis in the LiF-CaF2-Yb2O3 (n(LiF)∶n(CaF2)=77∶23) eutectic system with self-consumed Ni as cathode at a temperature of 1 523 K and cell voltage of 4.0 V. The implementation of Yb (Ⅲ) reduction includes two steps. Firstly, Yb (Ⅲ) obtained an electron, and was reduced to Yb (Ⅱ). Secondly, the Yb (Ⅱ) ion was reduced to Yb on the surface of Ni cathode. Consequently, the Ni-Yb alloy composed of basic phase Ni, Ni5Yb, Ni17Yb2 was formed through electrochemical reduction and alloyed process. It is fully demonstrated that the depolarization on active nickel electrode will lead to a positive shift of reduction potential of Yb (Ⅱ), which breaks through the limitation that the variable valence rare earth Yb (Ⅱ) ion can not be reduced to Yb on the surface of the inert electrode in fluorine salt medium.
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Published: 12 March 2019
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2019, Vol. 33 
