| KCl-NaCl-MgCl2熔盐中镁在铂电极上的阴极还原 |
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| 引用本文： | 刘江宁,孙泽,晋心文,李冰,宋兴福,于建国.KCl-NaCl-MgCl2熔盐中镁在铂电极上的阴极还原[J].有色金属(冶炼部分),2007(6):35-38. |
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| 作者姓名： | 刘江宁 孙泽 晋心文 李冰 宋兴福 于建国 |
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| 作者单位： | 华东理工大学盐湖工业技术研究中心,上海,200237 |
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| 摘 要： | 采用循环伏安法、计时电流法和计时电位法研究了KCl-NaCl-MgCl2熔盐中镁在Pt电极上电解沉积的电化学还原机理及其控制步骤。结果表明:镁在Pt电极上析出,先与Pt形成合金,然后才以纯镁的形式存在;镁的析出过程是包含两个电子的受扩散过程控制的准可逆反应;并测定了不同温度下镁离子在熔盐中的扩散系数,结果表明扩散系数与反应温度之间的关系服从Arrhenius方程,即D=D0exp(-E/RT),其中E=36.1 kJ/mol,D0=0.0041 cm2/s。
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| 关 键 词： | 氯化镁 熔盐 循环伏安法 计时电位法 扩散控制 |
| 文章编号： | 1007-7545（2007）06-0035-04 |
The Cathodic Reduction of Magnesium in KCl-NaCl-MgCl2 Melts on a Platinum Electrode |
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| LIU Jiang-ning,SUN Ze,JIN Xin-wen,LI Bing,SONG Xing-fu,YU Jian-guo.The Cathodic Reduction of Magnesium in KCl-NaCl-MgCl2 Melts on a Platinum Electrode[J].Nonferrous Metals(Extractive Metallurgy),2007(6):35-38. |
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| Authors: | LIU Jiang-ning SUN Ze JIN Xin-wen LI Bing SONG Xing-fu YU Jian-guo |
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| Abstract: | Cyclic voltammetry,chronopotentiometry and chronoamperometry were used to study the electroreduction mechanism and controlling step of magnesium electrodepositing on Pt electrode from KCl-NaCl-MgCl2 molten salts.It was found that magnesium deposited on Pt cathode formed boundary alloy with Pt firstly,then existing in pure magnesium.The electroreduction process of magnesium depositing is a quasi-reversible diffusion controlled reaction including two electrons transfer.The relation between diffusion coefficient of magnesium ion in molten salts and temperature is expressed by the Arrhenius equation: D=D0exp(-E/RT),where E=36.1 kJ/mol,D0=0.0041 cm2/s. |
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| Keywords: | Magnesium chloride Molten salts Cyclic voltammetry Chronopotentiometry Diffusion controlled |
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