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 shu

Preparation of Mg-Zr Alloys in KCl-MgCl₂-K₂ZrF₆-ZrO₂ Molten System

JIANG Tao ^1, ,
TIAN Jie ¹ ,
WANG Ning ¹ ,
PENG Shu-Ming ¹ ,
LI Mei ² ,
HAN Wei ² ,
ZHANG Mi-Lin ²

1.
Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621999, Sichuan Province, P. R. China;
2.
Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, P. R. China

Received Date: 21 March 2016
Revised Date: 3 June 2016

Fund Project: The project was supported by the Major Research Plan of the National Natural Science Foundation of China (91426302) and National Natural Science Foundation of China (21301163).

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.
- LiCl-KCl- K₂ZrF₆,
- ZrO₂,
- Mg-Zr alloy,
- Preparation
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Preparation of Mg-Zr Alloys in KCl-MgCl₂-K₂ZrF₆-ZrO₂ Molten System