Method for surface treatment of aluminum alloy...

Metal treatment – Process of modifying or maintaining internal physical... – Processes of coating utilizing a reactive composition which...

Reexamination Certificate

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C148S264000, C148S285000, C205S213000

Reexamination Certificate

active

06849138

ABSTRACT:
The surface of an aluminum alloy high-temperature processed article containing Mg is heated at a high temperature of 200° C. or above, thereafter the surface is etched with an aqueous solution containing a chelating agent, and then at least one surface treatment selected from hydration oxidation treatment, coating type chromating, coating, anodizing, and alternating current electrolysis in an aqueous alkali solution is further carried out.This method can provide a surface-treated aluminum alloy high-temperature processed article having superior anticorrosion and adhesion of coatings and a good surface appearance, and is effective as a pretreatment for further surface treatment.

REFERENCES:
patent: 3655467 (1972-04-01), Sopp, Jr.
patent: 4476658 (1984-10-01), Johnstone
patent: 4778533 (1988-10-01), Gregory et al.
patent: 5055257 (1991-10-01), Chakrabarti et al.
patent: 5104465 (1992-04-01), McAuliffe et al.
patent: 5086540 (1975-11-01), None
patent: 58-187258 (1983-11-01), None
patent: 6434731 (1989-02-01), None
patent: 1212775 (1989-08-01), None
patent: 297700 (1990-10-01), None
F. A. Lowenheim, Electroplating, McGraw-Hill Book Co., New York, 1978, pp 89.*
Julius Grant, editor, Hackh's Chemical Dictionary, fourth edition, MrGraw-Hill, Book Co., New York, 1969, pp 31.*
F.A. Lowenheim,Electroplating,McGraw-Hill Book Co., New York, 1978, pp 74-77, 89-91 and 463-467.

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