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Mo,W电极在MgCl_2-KCl-NaCl-CaCl_2熔盐中电解镁的钝化行为
Passivation Behaviors of Mo,W Electrodes in MgCl_2-KCl-NaCl-CaCl_2 Molten Salt for Electrolysis of Magnesium

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发布日期
2008-05-28
作者
陈野
叶克
CHEN Ye
YE Ke
所在专题
  • 2008年第14卷 [90]
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摘要
应用循环伏安法和计时电流法研究了Mg(Ⅱ)在MgCl2-KCl-NaCl-CaCl2四元熔盐体系中于(Mo、W)阴极上的放电过程及其钝化行为.结果表明,W电极放电反应的可逆性比Mo电极的好.后者的计时电流曲线偏离线性特征,且其阴极钝化比W严重.
 
The discharge process and passivation behaviors of Mg(Ⅱ) on cathode(Mo、W) in MgCl2-KCl-NaCl-CaCl2 molten salt system had been investigated by means of cyclic voltammetry and chronoamperometry.The composition of molten salt was MgCl(10%)+CaCl(20%)+NaCl(60%)+KCl(10%)(by mass) and the temperature of electrolysis was 725 ℃.The deposition potential of Mo was 37 mV more negative than that of W,while the peak current was sharper than Mo according to the voltammograms at 0.05 V/s,indicating that the passivation on Mo cathode is easier than W.The formation of MgO impurities during the electrolysis could cause the cathode passiration.However,the reversibility on the discharge reaction of W cathode was better than Mo electrode,and the reduction peak potential of W electrode almost unchanged with the scan rate.The I~t-1/2 curves demonstrated a positive linear relationship on W electrode,but deviated from the linear characteristics on Mo electrode due to the passivation.
 
出处
电化学,2008,14(02):197-199.
本条目访问地址(URI)
https://dspace.xmu.edu.cn/handle/2288/58167

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