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Kinetics of aluminium deposition from aluminium chloride—alkali chloride melts

✍ Scribed by R. Ødegard; A. Bjørgum; Å. Sterten; J. Thonstad; R. Tunold

Publisher
Elsevier Science
Year
1982
Tongue
English
Weight
363 KB
Volume
27
Category
Article
ISSN
0013-4686

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✦ Synopsis

The kinetics of aluminium deposition from NaCI-AICl, and NaCl-KCI-AlCI, melts (cata, -=z 0.4 mol %) was studied by linear sweep ~oltammetry and potential step ampero.nctry. The reduction of AK& on tungsten and aluminium elcctrodcs was found to be diffusion controlled. The diffusion coefficients of AICI, wet-c: 3.5 x lo-' cm2 s-t at 82O'C in NaCI-AICI,. 2.7 x lo-' cm' s-r at 825"C,and 2.1 Y 10-5cmrs-' at 705°C in KCI-NaCl-AlCI,.

The rate wnstant for AlCl, reduction at these conditions was found to be in the order of 0.2 cm s-*, in good agreement with extrapolated literature data.

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