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Passivation of the aluminium cathode during deposition of aluminium from aluminium chloride-sodium chloride melts

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

Publisher
Elsevier Science
Year
1984
Tongue
English
Weight
296 KB
Volume
29
Category
Article
ISSN
0013-4686

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✦ Synopsis

The kinetics of aluminium deposition from NaCI-AICl, melts (c,,,,, < 10 mol%) contained in alumina crucibles was studied by linear sweep voltammetry and potential step amperometry at temperatures around 820°C. At low concentrations (r,,,, I c 0.4 mol %) the reduction of AlCl, on iiquid aluminium has been found to bediffusion controlled. At higher concentrations a passivation of the aluminium electrode was observed during the deposition reaction. The passivation appears to be caused by precipitation of alumina from supersaturated melt in the diffusion layer at the aluminium cathode.

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