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。
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=Doexp（-E/RT）, where E=36.1 kJ/mol, Do=0. 0041 cm2/s.
出处
《有色金属（冶炼部分）》
CAS
北大核心
2007年第6期35-38,共4页
Nonferrous Metals（Extractive Metallurgy)
关键词
氯化镁
熔盐
循环伏安法
计时电位法
扩散控制
Magnesium chloride
Molten salts
Cyclic voltammetry
Chronopotentiometry
Diffusion controlled
作者简介
刘江宁（1979-），男，博士生
