Abstract
The electrochemical formation of Mg-Al-Y alloys was studied in the LiCl-NaCl-MgCl2 melts by the addition of AlF3 and YCl3 on a molybdenum electrode at 973 K (700 °C). In order to reduce the volatilization of salt solvent in the electrolysis process, the volatile loss of LiCl-NaCl-MgCl2 and LiCl-KCl-MgCl2 melts was first measured in the temperature range from 873 K to 1023 K (600 °C to 750 °C). Then, the electrochemical behaviors of Mg(II), Al(III), Y(III) ions and alloy formation processes were investigated by cyclic voltammetry, chronopotentiometry, and open circuit chronopotentiometry. The cyclic voltammograms indicate that the under-potential deposition of magnesium and yttrium on pre-deposited Al leads to formation of Mg-Al and Al-Y intermetallic compounds. The Mg-Al-Y alloys were prepared by galvanostatic electrolysis in the LiCl-NaCl-MgCl2-AlF3-YCl3 melts and characterized by X-ray diffraction and scanning electron microscopy with energy dispersive spectrometry. Composition of the alloys was analyzed by inductively coupled plasma-atomic emission spectrometer, and current efficiency was also determined by the alloy composition.
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Acknowledgments
The work was financially supported by Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, the National Natural Science foundation of China (21271054 and 21173060), the Major Research plan of the National Natural Science Foundation of China (91326113 and 91226201) and the Fundamental Research funds for the Central Universities (HEUCF201403001).
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Li, M., Liu, Y., Han, W. et al. The Electrochemical Co-reduction of Mg-Al-Y Alloys in the LiCl-NaCl-MgCl2-AlF3-YCl3 Melts. Metall Mater Trans B 46, 644–652 (2015). https://doi.org/10.1007/s11663-014-0222-9
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DOI: https://doi.org/10.1007/s11663-014-0222-9