Method for surface-treating substrate and substrate surface-trea

Details Method for surface-treating substrate and substrate surface-trea Method for surface-treating substrate and substrate surface-trea

1996-12-20

1998-09-01

Gorgos, Kathryn L.

Electrolysis: processes, compositions used therein, and methods

Product produced by electrolysis involving electrolytic...

205321, 428469, C25D 1130

Patent

active

058006931

ABSTRACT:
A method for surface-treating a substrate made of a magnesium-based metal material is disclosed, which includes immersing the substrate in an electrolyte composed of an aqueous solution containing at least one component selected from the group consisting of hydroxides, carbonates and bicarbonates of alkali metals or alkali earth metals, and a film-forming stabilizer, and conducting an electrolysis to form an anodic oxide film on a surface of the substrate. The film-forming stabilizer includes one component selected from salts of mineral acids, fluorides, silicates and silicofluorides and an additional component selected from ethylene glycol, trihydroxypropane, dihydroxyethyl ether and sodium hydroxybenzoate. Further, in accordance with the present invention, there is provided the substrate which is surface-treated by the method.

REFERENCES:
patent: Re29739 (1978-08-01), Kessler
patent: 2497036 (1950-02-01), Simpson et al.
patent: 3620939 (1971-11-01), Fruchtnicht
patent: 4744872 (1988-05-01), Kobayashi et al.
patent: 4976830 (1990-12-01), Schmeling et al.
Patent Abstracts of Japan, vol. 12, No. 344 (C-528), 16 Sep. 1988 and JP 63100195 A, (Ube Ind Ltd), 2 May 1988.

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