| KCl-LiCl-MgCl2熔盐体系中共电沉积制备Mg-Li合金及理论分析 | |
| Prepartion and Theory Analysis of Mg-Li Alloys via Codeposition in KCl-LiCl-MgCl2 Melts | |
| 摘要: 在670 ℃的KCl-LiCl-MgCl2熔盐体系中通过共电沉积方法制备了Mg-Li合金，并进行了理论分析。循环伏安表明：670 ℃时，锂在镁上(镁预先沉积到钼丝上)的欠电位沉积形成了液态的Mg-Li合金；当MgCl2质量分数为10%时，出现了Mg-Li合金成核。极化曲线表明：在含有5% MgCl2的熔盐中，MgCl2的极限电流密度为0.35 A·cm-2，超过此值时，Mg和Li就能产生共电沉积。对沉积物进行X射线衍射和电感耦合等离子体发射光谱(ICP)分析表明：通过恒电流电解得到了3种不同相的Mg-Li合金。在电流密度为6.21 A·cm-2电解2 h条件下，只有当MgCl2质量分数小于10%时，才能得到Mg-Li合金。并通过Nernst和浓差极化方程讨论了MgCl2浓度对于Mg-Li合金形成的影响。Mg-Li合金中锂的含量能够通过熔盐中的MgCl2浓度配比和电解参数来控制。实验证明这种直接从原料入手，通过共电沉积制备Mg-Li合金的新方法是可行的。 | |
| 关键词: 镁锂合金 KCl-LiCl-MgCl2 熔盐 共沉积 循环伏安 | |
| 基金项目: | |
| Abstract: Preparation and theory analysis of Mg-Li alloys are discussed by codeposition from KCl-LiCl-MgCl2 melts at 670 ℃. Underpotential deposition (UPD) of lithium on pre-deposited magnesium leads to a formation of liquid Mg-Li alloys at 670 ℃, and nucleation of Mg-Li alloys is involved in the electrodeposition process in KCl-LiCl with 10wt% MgCl2 from cyclic voltammograms. Polarization curve shows that the codepositon of Mg and Li happens when the current indensity exceeds about 0.35 A·cm-2 (value of limited current density of MgCl2) in KCl-LiCl melts containing 5wt% MgCl2. X-ray diffraction and inductively coupled plasma analysis of the deposits indicate three kinds of phases Mg-Li alloys are obtained via galvanostatic electrolysis. Under the electrolytic condition of 6.21 A·cm-2 for 2 h, only when MgCl2 concentration is lower than 10wt%, can Mg-Li alloys be obtained. The effects of MgCl2 concentration on formation of Mg-Li alloys were discussed via Nernst and concentration polarization equations. And the lithium contents of Mg-Li alloys could be controlled by MgCl2 concentration and the electrochemical parameters. The method in this work for the preparation of Mg-Li alloy by co-deposition Mg and Li directly from raw materials was proved to be feasible. | |
| Keywords: Mg-Li alloys KCl-LiCl-MgCl2 Molten salt codeposition cyclic voltammetry | |
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| 颜永得,张密林,韩 伟,薛 云,何立义,陈 增,唐定骧.KCl-LiCl-MgCl2熔盐体系中共电沉积制备Mg-Li合金及理论分析[J].无机化学学报,2008,24(6):902-906. | |
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