熔盐电解制备铝锂合金中阳极过程动力学参数的分析与计算  

Analysis and calculation of anodic kinetic parameters for process of preparation of Al- Li alloys by molten salt electrolysis

作　　者：李继东[1] 张保国[1] 张明杰[2] 张廷安[2] 

机构地区：[1]辽宁科技大学材料与冶金学院,辽宁鞍山114051 [2]东北大学材料与冶金学院,沈阳110819

出　　处：《材料与冶金学报》2014年第3期225-228,共4页Journal of Materials and Metallurgy

基　　金：国家自然科学基金资助项目(51204094);辽宁省教育厅一般项目(L2012092)

摘　　要：680℃下,在LiCl-LiF-KF体系中分别以LiCl和Li2CO3为原料电解制备铝锂合金,采用连续脉冲-计算机法测量阳极过电压并研究极化曲线的变化,根据电极过程动力学的理论计算并分析了CO2-3放电机理和反应速度控制步骤.研究表明：在电流密度为0.1-0.3 A·cm-2的Tafel区内,LiCl电解电极反应受电化学极化控制,Li2CO3电解电极反应受化学极化控制;电解Li2CO3时整个电极反应速率是由炭阳极上配合氧离子的缓慢放电引起的电化学控制步骤决定的.Al- Li alloys were prepared through molten salt electrolysis by using LiCl and Li2CO3as raw materials respectively in a mixture fused salt of LiCl- LiF at 680 ℃. The anodic overvoltage was measured by continuous pulse oscillograph method and the polarization curve was studied. According the electrode process theory,anode reaction mechanism and reaction rate- determining step were calculated and analyzed. The results indicated that when the overvoltage is in the Tafel zone with current density of 0. 1 to 0. 3 A·cm- 2,electrode reaction of LiCl is controlled by electrochemical polarization while that of Li2CO3is controlled by chemical polarization. In Li2CO3electrolysis,the entire process slow is controlled by the electrochemical step caused by the oxygen ions discharging on carbon anode.

关 键 词：极化曲线 熔盐电解 铝锂合金 动力学参数 

分 类 号：TF826.13[冶金工程—有色金属冶金] TF803.131