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 MgCl2 and 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.
WEI Shu-Quan
,
ZHANG Mi-Lin
,
HAN Wei
,
YAN Yong-De
,
ZHANG Bin
. STUDY ON ELECTROCHEMICAL CODEPOSITION OF Mg-Li-Gd ALLOYS FROM CHLORIDE MELTS[J]. Acta Metall Sin, 2011
, 47(2)
: 173
-178
.
DOI: 10.3724/SP.J.1037.2010.00367
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