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首页> 外文期刊>Electrochimica Acta >Cathodic overvoltage and the contents of sodium and lithium in molten aluminium during electrolysis of cryolite-based melts
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Cathodic overvoltage and the contents of sodium and lithium in molten aluminium during electrolysis of cryolite-based melts

机译：冰晶石基熔体电解过程中阴极过电压以及铝熔液中钠和锂的含量

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摘要

The cathodic concentration overvoltage in Na_3AIF_6-AIF_3-Al_2O_3(sat.) melts was investigated at the temperature of 1000°C. The melts contained 10 and 20 wt.% of AlF_3. Experimental data on the cathodic overvoltage agreed well with values calculated from the content of sodium in aluminium. The dependence of the cathodic overvoltage on 'temperature was studied as well. It was shown that the addition of 5 wt.% CaF2 or 5 wt.% MgF_2 does not influence the overvoltage significantly, while the addition of 2 wt.% LiF decreases the overvoltage by 20 mY at a cathodic current density of 0.25 A cm -2 and by 50 mY at 0.75 A cm -2. These results are consistent with the influence of these additions on the content of sodium in aluminium.
机译：在1000°C的温度下研究了Na_3AIF_6-AIF_3-Al_2O_3（sat。）熔体中的阴极浓度过电压。熔体包含10和20重量％的AlF 3。阴极过电压的实验数据与从铝中钠含量计算得出的值非常吻合。还研究了阴极过电压对温度的依赖性。结果表明，添加5 wt。％的CaF2或5 wt。％的MgF_2不会显着影响过电压，而添加2 wt。％的LiF在0.25 A cm-的阴极电流密度下将过电压降低20 mY。 2和0.75 A cm -2的50 mY。这些结果与这些添加对铝中钠含量的影响是一致的。

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