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电流密度对镁电解的电流效率和镁在钢阴极上的湿润性的影响已在710±10℃的条件下,在道屋化学公司专有的富氯化钠的 NaCl-MgCl_2电解质中进行了研究。在氩气覆盖的电解质中,钢制小电极的电流反向计时电位图表明,除了在最小电流密度的情况下,当将电流密度增加到0.7A/cm~2,电流效率随电流密度的增大而直线上升。在0.7～1.2A/cm~2的范围内,电流效率稳定在94％。进一步提高电流密度,将使电流效率降低。有趣的是,在模拟试验电解槽中观察到,随着电流密度增加到最高值1.2A/cm~2,电流效率仍呈直线增加。熔融镁对钢的湿润程度随阴极电流密度的减小而降低,低于0.4A/cm~2时湿润性很差。研究结果表明,镁电解槽可以用比现行工业电解槽平均操作电流密度0.3～0.5A/cm~2更大的电流密度进行作业,以使电流效率,产率和单位产量达到最佳值。在生产实践中电解生产的其他变量可能使得高电流密度操作发生困难。
The effect of current density on the current efficiency of magnesium electrolysis and the wettability of magnesium on the steel cathode has been studied at Dawn Chemical’s proprietary sodium chloride-rich NaCl-MgCl 2 electrolyte at 710 ± 10 ° C . In Argon-covered electrolytes, the current reversal chronopotentiogram of the small steel electrodes shows that, with increasing current density to 0.7 A / cm ~ 2 at current densities, the current efficiency increases with increasing current density Big and straight up. In the range of 0.7 ~ 1.2A / cm ~ 2, the current efficiency stabilized at 94%. Further increasing the current density will reduce the current efficiency. Interestingly, it was observed in the simulated test cell that the current efficiency still increased linearly as the current density increased to a maximum value of 1.2 A / cm ~ 2. The wettability of molten magnesium to steel decreases with the decrease of cathodic current density, and the wettability is poor when the melting temperature is below 0.4 A / cm 2. The results show that the magnesium electrolyzer can be operated at a current density higher than the average operating current density of 0.3-0.5 A / cm ~ 2 in current industrial electrolyzers to achieve the best current efficiency, yield and unit output. Other variables that are produced electrolytically in production may make high current density operation difficult.