Plating bath for electrodeposition of aluminum and plating proce

Chemistry: electrical and wave energy – Processes and products

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C25D 344

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049043552

ABSTRACT:
In the plating for electrodeposition of aluminum using a mixed molten salt bath comprising an aluminum halide and a quaternary ammonium salt, the mixed molten salt bath comprises from 20 to 80 mol % of the aluminum halide and from 20 to 80 mol % of a 1-alkyl- or 1,3-dialkylimidazolium halide, provided that the alkyl group has 1 to 12 carbon atoms, by the use of which the plating can be carried out at a high current density of not less than 30 A/dm.sup.2 without generation of burnt deposits, which has been difficult to carry out using the conventional molten salt bath. Addition of a halide of an alkali metal or alkaline earth metal, or an organic solvent, to the above plating bath can improve conductivity and also enhance uniform electrodeposition performance.

REFERENCES:
patent: 2446331 (1948-08-01), Hurley
patent: 2446349 (1948-08-01), Wier et al.
patent: 2446350 (1948-08-01), Wier
patent: 4071415 (1978-01-01), Wong
patent: 4747916 (1988-05-01), Kato et al.
J. J. Auborn, et al, "An Ambient Temperature Secondary Aluminum Electrode: Its Cycling Rates and Its Cycling Efficiencies", J. Electrochem, Soc., vol. 132, No. 3, 1985, pp. 598-601.

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