Citation: JIANG Tao, TIAN Jie, WANG Ning, PENG Shu-Ming, LI Mei, HAN Wei, ZHANG Mi-Lin. Preparation of Mg-Zr Alloys in KCl-MgCl2-K2ZrF6-ZrO2 Molten System[J]. Acta Physico-Chimica Sinica, ;2016, 32(9): 2301-2308. doi: 10.3866/PKU.WHXB201606032
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To investigate the electrochemical co-reduction mechanism associated with the formation of Mg- Zr alloys, the electrochemical behaviors of Zr(IV) in KCl-MgCl2-K2ZrF6 and KCl-MgCl2-K2ZrF6-ZrO2 melts were studied on a molybdenum electrode at 1023 K. Cyclic voltammograms (CVs) and square-wave voltammograms (SWVs) showed that Zr(IV) was reduced to Zr metal by a two-step mechanism consisting of the Zr(IV)/Zr(II) and Zr(II)/Zr(0) pairs in the KCl-MgCl2-K2ZrF6 melt. The dissolution of ZrO2 in the KCl-MgCl2-K2ZrF6 melt was ascertained from CVs, while the Zr(IV) concentration in the melt was assessed by inductively coupled plasma atomic emission spectrometry (ICP-AES). Mg-Zr alloys were obtained by galvanostatic electrolysis in KCl-MgCl2- K2ZrF6- KF- ZrO2 melts and subsequently characterized by X- ray diffraction (XRD) and scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS). The Zr concentrations in the alloys as determined by ICP-AES were as high as 7.2% (w). The formation of Mg-Zr alloys could be controlled by varying both the reaction time and the melt composition. These results confirm the feasibility of the direct electrolysis of ZrO2 to obtain Mg-Zr alloys in KCl-MgCl2-K2ZrF6-ZrO2 melts.
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Keywords:
- LiCl-KCl- K2ZrF6,
- ZrO2,
- Mg-Zr alloy,
- Preparation
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