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首页> 外文期刊>Journal of Applied Electrochemistry >Electrodeposition of aluminum from molten AlCl_3-NaCl-KCl mixture
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Electrodeposition of aluminum from molten AlCl_3-NaCl-KCl mixture

机译：从熔融的AlCl_3-NaCl-KCl混合物中电解沉积铝

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摘要

Electrochemical deposition of aluminum from basic and acidic molten NaCl-KCl-AlCl_3 mixture on a graphite electrode at 140 deg C was studied by voltammetry, chronopotentiometry and constant current deposition. The deposition of aluminum was found to proceed via a nucleation/growth mechanism in basic melt, while it was found to be diffusion controlled in acidic melt. The diffusion coefficient calculated for Al_2Cl_7~- ions in acidic melt by voltammetry was in agreement with the deductions of voltammetry. The morphology of the aluminum deposits was examined using a metallographic microscope and by SEM. It was shown that, depending on the current density (c.d.) and AlCl_3 concentration (acidic or basic melt) different aluminum morphologies were evident but a silver-bright, compact, and very stable metallic form of aluminum deposit was obtained in acidic melt with KI addition as surfactant.
机译：通过伏安法，计时电位法和恒流沉积法研究了碱性和酸性熔融NaCl-KCl-AlCl_3混合物在140℃下在石墨电极上的电化学沉积。发现铝的沉积通过成核/生长机理在基本熔体中进行，而发现其在酸性熔体中受到扩散控制。用伏安法计算的Al_2Cl_7〜-离子在酸性熔体中的扩散系数与伏安法的推导相符。使用金相显微镜和SEM检查铝沉积物的形态。结果表明，取决于电流密度（cd）和AlCl_3浓度（酸性或碱性熔体），可以看到不同的铝形态，但在含KI的酸性熔体中可获得银亮，致密且非常稳定的金属形式的铝沉积物另外作为表面活性剂。

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