Electrodeposition of aluminum from molten AlCl3-NaCl-KCl mixture

被引：56

作者：

Jafarian, M. ^{[1
]}

Mahjani, M. G.

Gobal, F.

Danaee, I.

机构：

[1] KN Toosi Univ Technol, Dept Chem, Tehran 158754416, Iran

[2] Sharif Univ Technol, Dept Chem, Tehran 113659516, Iran

来源：

JOURNAL OF APPLIED ELECTROCHEMISTRY | 2006年 / 36卷 / 10期

关键词：

aluminum; diffusion coefficient; electrodeposition; KI; molten salt;

D O I：

10.1007/s10800-006-9192-1

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Electrochemical deposition of aluminum from basic and acidic molten NaCl-KCl-AlCl3 mixture on a graphite electrode at 140 degrees 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 Al2Cl-(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 AlCl3 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.

引用

页码：1169 / 1173

页数：5

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