Electrochemical Formation of Mg–Li–Sm Alloys by Codeposition from LiCl–KCl–MgCl2–SmCl3 Molten Salts
Electrochemical Formation of Mg–Li–Sm Alloys by Codeposition from LiCl–KCl–MgCl2–SmCl3 Molten Salts
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DOI：
10.1007/s11663-011-9550-1
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发表时间：
2011-07
期刊：
影响因子：
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通讯作者：
W. Han;Fengli Wang;Yang Tian;Milin Zhang;Yongde Yan
中科院分区：
文献类型：
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作者：
W. Han;Fengli Wang;Yang Tian;Milin Zhang;Yongde Yan
本文研究了在LiCl-KCl-MgCl2-SmCl3熔体中共沉积制备Mg-Li-Sm合金的电化学方法。采用循环伏安法、计时电位法和计时电流法等暂态电化学技术研究了Mg-Li-Sm合金的电化学形成过程。计时电位图表明，当电流密度大于−0.31A/cm−2时，镁、锂和Sm发生共沉积。计时电流图显示，镁、锂和Sm共沉积的起始电位为−2.40nV，当外加电压大于−2.40nV时，形成镁、锂和Sm共沉积。电感耦合等离子体(ICP)分析表明，Mg-Li-Sm合金中锂和Sm的含量可以通过控制MgCl2和SmCl3的浓度来控制。结果表明，Sm能显著细化铸态组织。当Sm含量为0.8wt/%时，晶粒度最细。
In this article, the electrochemical method of preparing Mg–Li–Sm alloys by codeposition in LiCl–KCl–MgCl2–SmCl3melts was investigated. Transient electrochemical techniques, such as cyclic voltammetry, chronopotentiometry, and chronoamperometry were used to explore the electrochemical formation of Mg–Li–Sm alloys. Chronopotentiograms demonstrated that the codepositon of Mg, Li, and Sm occurred when current densities were more negative than −0.31 A cm−2. Chronoamperograms indicated that the onset potential for the codeposition of Mg, Li, and Sm was −2.40 V, and the codeposition of Mg, Li, and Sm was formed when the applied potentials were more negative than −2.40 V. The different phases of Mg–Li–Sm alloys were prepared by galvanostatic electrolysis and characterized by X–ray diffraction (XRD), optical microscope (OM), and scanning electron microscopy (SEM). An inductively coupled plasma (ICP) analysis showed that the lithium and samarium contents in Mg–Li–Sm alloys could be controlled by the concentrations of MgCl2and SmCl3. The results demonstrated that Sm could refine the grains dramatically. When the Sm content was 0.8 wt pct, the grain size was the finest.