电解法制备Mg-Zn-Si三元合金的热力学分析及过程参数的研究

Thermodynamic analysis and process parameters of Mg-Zn-Si ternary alloy prepared by electrolysis

研究了电解法生产Mg-Zn-Si三元合金过程的提取效率,并采用连续脉冲-示波器法监控电解过程中的分解电压、槽电压等过程参数的计时变化。结果表明,在Mg存在的情况下,Zn并不会参加Si的还原反应;实际分解电压随电流强度的增大而升高,且随着温度的升高,实际分解电压整体呈下降趋势;随着电流密度的升高,提取效率先升高,达到最大值65.1%后下降;提取效率随着电解时间的延长先升高而后降低,1h时获得最大提取效率70.1%;在900℃、电流强度为4A时,电解2.5h成功制备出硅含量为8.6%的Mg-Zn-Si合金。

The extraction efficiency of Mg-Zn-Si alloy prepared by molten salt electrolysis method was studied. The time variation of the process parameters such as decomposition voltage and cell voltage was monitored by continuous pulse oscillograph method. The results show that Zn does not participate in the reduction reaction of Si in the presence of Mg. The actual decomposition voltage increases with the increase of the current intensity,and the actual decomposition voltage decreases as the temperature increases. With the increase of current density,the extraction efficiency first increases to 65. 1% and then decreases. The extraction efficiency increases first and then decreases with the extension of the electrolysis time,and the maximum of extraction efficiency is 70. 1% when the electrolysis time is 1 h. Finally,the Mg-Zn-Si alloy with the silicon content of 8. 6% can be obtained by electrolyzing for 2. 5 h at 4 A and 900℃.