Metal finishes

Details Metal finishes Metal finishes

2006-01-24

2006-01-24

Zimmerman, John J. (Department: 1775)

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Forming multiple superposed electrolytic coatings

C205S179000, C205S220000, C205S287000, C428S673000, C428S666000, C428S935000, C428S626000

Reexamination Certificate

active

06989087

ABSTRACT:
A method of forming a surface finish of trivalent chromium on metal or plastics substrates by electrodeposition from an aqueous plating solution of trivalent chromium ions in which the trivalent chromium is deposited on a layer of silver or silver alloy whereby the color and/or corrosion resistance of the trivalent chromium is comparable to surface finishes of hexavalent chromium. The invention avoids the health and safety risks associated with the electrodeposition of hexavalent chromium surface finishes.

REFERENCES:
patent: 2714088 (1955-07-01), Karash
patent: 2928169 (1960-03-01), Beach et al.
patent: 3298802 (1967-01-01), Odekerken
patent: 4159230 (1979-06-01), Barnes et al.
patent: 4169022 (1979-09-01), Ward et al.
patent: 4477318 (1984-10-01), Tomaszewski
patent: 1120420 (1982-03-01), None
patent: 48-21638 (1973-03-01), None

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