Method for electrically coloring aluminum material and gray-colo

Electrolysis: processes – compositions used therein – and methods – Product produced by electrolysis involving electrolytic...

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205173, 4284722, C25D 1122

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active

058491694

ABSTRACT:
Disclosed are a method for electrolytically coloring an aluminum material which is capable of coloring an anodic oxide film in a gray color and a gray-colored aluminum material obtained thereby. In a method for electrolytically coloring an aluminum material having the anodic oxide film formed on the surface thereof in an electrolytic coloring solution containing an inorganic metal salt, a strongly acidic electrolytic coloring solution containing sulfuric acid, stannous sulfate, nickel sulfate, and ammonium sulfate and having a pH of not more than 2.5 is used as the electrolytic coloring solution. Preferably the electrolytic coloring solution contains sulfuric acid at a concentration in the range of 3 to 30 g/liter, stannous sulfate at a concentration in the range of 0.1 to 3.0 g/liter, nickel sulfate at a concentration in the range of 10 to 100 g/liter, and ammonium sulfate at a concentration in the range of 20 to 100 g/liter. By this method, a gray-colored aluminum material possessed of an anodic oxide film colored in an achromatic or substantially achromatic gray color is obtained.

REFERENCES:
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patent: 4066816 (1978-01-01), Sheasby
Database WPI, Section CH, Week 9519, No date available Derwent Publications Ltd., London, GB; Class M11, AN 95-145297. XP-002058461 & JP 07 070 791 A (Metarex KK).
Database WPI, Section Ch, Week 8843, No date available Derwent Publications Ltd., London, GB; Class M11, AN 88-303843, XP-002058462 & JP 63 223 199 A (Korona Kogyo KK).
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Chemical Abstracts, vol. 86, No. 18, 2 May 1977, Columbus, Ohio, US; Abstract No. 129964, Suzuki, Ryoji: "Rapid coloring of anodized aluminum", XP-002058460 & JP 51 122 637 A (Japan).

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