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Chronopotentiometric Investigation of the Oxidation of Aluminum in Chloroaluminate Melts

By E. Lamy, L. Nadjo, J. M. Saveant, J. Electro, J. W. Ross, R. D. Demars, I. Shain, Anal Chem, B. Gilbert, D. L. Brotherton and G. Mamantov


Oxidation of an aluminum electrode in molten A1Cls-MC1 (63-37 mole per cent, M = Na or Li) has been investigated by chronopotentiometry. Wel l-defined and reproducible transit ion times, caused by the formation of a poorly conducting A]2C16 layer at the electrode surface and the depletion of cur-rent-carry ing alkal i metal ions, were observed. The observations are in very good agreement with the theoretical predictions imilar to those of Braunstein and co-workers. In the range of current densities employed (up to 300 mA/cm 2 at 140 ~ the aluminum electrode behaves reversibly. It has been very recently shown by Braunstein and co-workers (1) that in molten alkal i metal f luoride-beryl l ium fluoride mixtures, the chronopotentiometric oxidation of a beryl l ium anode results in a layer of near ly pure, almost nonconductive BeF2 as the mobi le alkal i metal ions are swept away, and, as the result

Year: 1768
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