Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Forming nonelectrolytic coating after forming nonmetal...
Patent
1993-10-01
1994-12-20
Silverberg, Sam
Electrolysis: processes, compositions used therein, and methods
Electrolytic coating
Forming nonelectrolytic coating after forming nonmetal...
148276, 148267, 427343, 205201, C23C 2256
Patent
active
053743474
ABSTRACT:
Corrosion resistant seal-coatings are formed on anodized aluminum by immeon in aqueous solutions containing trivalent chromic compounds with an alkali added near or slightly beyond the precipitation of insoluble basic compounds. Trivalent chromium seals formed on the anodized aluminum when tested in 5% NaCl salt spray chamber showed improved corrosion resistance. After a post-treatment in a peroxide or permanganate solution, the corrosion resistance for the anodized aluminum showed even greater improvement in the salt chamber.
REFERENCES:
patent: 4171231 (1979-10-01), Bishop
patent: 4359346 (1982-11-01), Da Fonte
patent: 5304257 (1991-04-01), Pearlstein
Agarwala Vinod S.
Pearlstein Fred
Bechtel James B.
Silverberg Sam
The United States of America as represented by the Secretary of
Tura James V.
Verona Susan E.
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