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研究论文

Mo,W电极在MgCl_2-KCl-NaCl-CaCl_2熔盐中电解镁的钝化行为

  • 陈野 ,
  • 叶克
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  • 哈尔滨工程大学超轻材料与表面技术教育部重点实验室,哈尔滨工程大学超轻材料与表面技术教育部重点实验室 黑龙江哈尔滨150001,黑龙江哈尔滨150001

收稿日期: 2008-05-28

  修回日期: 2008-05-28

  网络出版日期: 2008-05-28

Passivation Behaviors of Mo,W Electrodes in MgCl_2-KCl-NaCl-CaCl_2 Molten Salt for Electrolysis of Magnesium

  • CHEN Ye ,
  • YE Ke
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  • (Key Laboratory of Superlight Materials and Surface Technology,Ministry of Education,Harbin Engineering University,Harbin 150001,China

Received date: 2008-05-28

  Revised date: 2008-05-28

  Online published: 2008-05-28

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.

关键词: 熔盐; ; 阴极放电; 钝化

本文引用格式

陈野 , 叶克 . Mo,W电极在MgCl_2-KCl-NaCl-CaCl_2熔盐中电解镁的钝化行为[J]. 电化学, 2008 , 14(2) : 197 -199 . DOI: 10.61558/2993-074X.1890

Abstract

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.

参考文献

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