Electrolytic coloring process for non anodized aluminum and its

Details Electrolytic coloring process for non anodized aluminum and its Electrolytic coloring process for non anodized aluminum and its

1978-02-09

1978-09-19

Mack, John H.

Chemistry: electrical and wave energy

Processes and products

204 35N, C25D 530, C25D 548

Patent

active

041152123

ABSTRACT:
Electrolytic coloring process for the surface of aluminum or aluminum alloy objects such as designed for the interior or exterior of buildings or even simpler objects such as ski poles, etc., characterized in that the object, without having been previously anodized, is directly subjected to the action of an alternating current at a voltage below the anodization voltage of the aluminum in an aqueous bath consisting of sulfuric acid and boric acid or only sulfamic acid, at least one salt of copper, tin, silver, nickel or gold; the resultant colored film is then coated with a colorless varnish.

REFERENCES:
patent: 3382160 (1968-05-01), Asada
patent: 3717555 (1973-02-01), Chakravarti et al.
patent: 4024039 (1977-05-01), Yoshida et al.

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