STUDY ON ELECTROCHEMICAL CODEPOSITION OF Mg-Li-Gd ALLOYS FROM CHLORIDE MELTS

doi:10.3724/SP.J.1037.2010.00367

Acta Metall Sin

2011, Vol. 47

Issue (2): 173-178 DOI: 10.3724/SP.J.1037.2010.00367

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STUDY ON ELECTROCHEMICAL CODEPOSITION OF Mg-Li-Gd ALLOYS FROM CHLORIDE MELTS

WEI Shuquan^{1, 2)}, ZHANG Milin¹, HAN Wei¹⁾, YAN Yongde¹, ZHANG Bin^{1, 3)}

1) Key Laboratory of Superlight Materials and Surface Technology (Ministry of Education), College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001
2) College of Chemistry & Chemical Engineering, Harbin Normal University, Harbin 150025
3) Institute of Petrochemistry, HLJ Academy of Sciences, Harbin 150040

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WEI Shuquan ZHANG Milin HAN Wei YAN Yongde ZHANG Bin. STUDY ON ELECTROCHEMICAL CODEPOSITION OF Mg-Li-Gd ALLOYS FROM CHLORIDE MELTS. Acta Metall Sin, 2011, 47(2): 173-178.

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Abstract Mg-Li-Gd alloys were obtained by electrochemical codeposition method in LiCl-KCl-MgCl₂-Gd₂O₃ molten salt on molybdenum electrode at 1073 K. Transient electrochemical techniques, such as cyclic voltammetry and chronopotentiometry, were used in order to study the reaction mechanism. XRD, SEM, EDS and OM were employed to characterize Mg-Li-Gd alloys. The results suggested that Gd₂O₃ could dissolve in LiCl-KCl-MgCl₂ molten salt while it could not in LiCl-KCl melt. Cyclic voltammograms and chronopotentiometry measurements indicated that the potential of Li metal deposition, after the addition of MgCl₂and Gd₂O₃, was more positive than the one of Li metal deposition before the addition. The codeposition of Mg, Li and Gd occurred when applied potentials were more negative than -2.30 V (vs. Ag/AgCl) or current densities were higher than 0.776 A/cm² in LiCl-KCl-MgCl₂-Gd₂O₃. Electrolysis temperature exerted a great influence on current efficiency, 78.87% current efficiency was obtained when electrolysis temperature was 873 K. Li content in Mg-Li-Gd alloys increased with the high current densities. XRD results showed that Mg₃Gd intermetallic compounds formed in Mg-Li-Gd alloys. Grain size became smaller as the Gd metal content increased in the alloy. The analysis of SEM and EDS demonstrated that the element of Gd was mainly distributed at grain boundaries.

Key words: electrochemical codeposition Mg-Li-Gd alloy Gd₂O₃ chloride melt

Received: 21 July 2010

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Supported by National High Technology Research and Development Program of China (No.2009AA050702), National Natural Science Foundation of China (No.50871033}), Fundamental Research Funds for the Central Universities (No.HEUCF101002) and Scientific Technology Project of Heilongjiang Province (No.GC06A212)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2010.00367 OR https://www.ams.org.cn/EN/Y2011/V47/I2/173

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