Process for forming colorless chromate coating film on bright al

Details Process for forming colorless chromate coating film on bright al Process for forming colorless chromate coating film on bright al

1992-12-16

1993-11-09

Niebling, John

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Coating predominantly single metal or alloy substrate of...

205196, 205286, 205319, C25D 500

Patent

active

052599370

ABSTRACT:
A colorless chromate coating film is formed on a bright aluminum wheel by subjecting the surface of an aluminum wheel to a cathodic electrolytic treatment in an acidic aqueous solution containing not less than 2 g/l of hexavalent chromium ions, 20 to 2,000 ppm of sulfate ions, 10 to 400 ppm of fluorine (F) as fluoride and not less than 20 ppm of zirconium ions at a pH of 0.6 to 1.7 at a current density of 0.5 to 15 A/dm.sup.2 for at least 30 seconds, thereby forming a coating film with a chromium coating amount of 50 to 250 mg/m.sup.2.

REFERENCES:
patent: 3475295 (1969-10-01), Smith et al.
patent: 3479162 (1969-11-01), Yanabu et al.
patent: 3943040 (1976-03-01), Willson
patent: 4206019 (1980-06-01), Classic
patent: 4432845 (1984-02-01), Ogata et al.
patent: 4545867 (1985-10-01), Ballarihi et al.

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