Electrolytic coloring process

Details Electrolytic coloring process Electrolytic coloring process

1981-04-16

1983-12-20

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

204 42, 204 58, 204DIG9, C25D 1122

Patent

active

044216106

ABSTRACT:
An electrolytic coloring process for aluminum or aluminum alloy is disclosed in which the aluminum is subjected to electrolytic treatment, in the absence of metal salts, in a low disolution electrolyte having a chemical activity equivalent to less than an H.sub.2 SO.sub.4 concentration of 4gm/liter, by applying an alternating current having a peak voltage of between 55 and 85 volts and a current density of less than 0.3 amp/dm.sup.2 and then treating the aluminum in an acid electrolyte containing a metal salt, again using alternating current of the same peak voltage range.

REFERENCES:
patent: 3634208 (1972-01-01), Kuroda
patent: 3929593 (1975-12-01), Sugiyama et al.
patent: 3959090 (1976-05-01), Hollrigl et al.
patent: 4021315 (1977-05-01), Yanagida
patent: 4022671 (1977-05-01), Asada
patent: 4042468 (1977-08-01), Hasegawa et al.

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