Corrosion resistant aluminum and aluminum coating

Details Corrosion resistant aluminum and aluminum coating Corrosion resistant aluminum and aluminum coating

1994-10-13

1995-08-01

Silverberg, Sam

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

106 1421, C23C 2256

Patent

active

054377404

ABSTRACT:
A non-chromium aluminum conversion coating composition for coating aluminum or an aluminum alloy which has as the essential ingredients an alkaline metal permanganate and aluminum nitrate and a pH of about 2.5 to about 4.0. The composition is effective in protecting aluminum and aluminum alloys for more than 168 hours in salt fog at 95.degree. F. according to standard ASTM method B-117. The process, of coating the aluminum or aluminum alloy is generally carried out by cleaning the aluminum or aluminum alloy with sodium hydroxide, and nitric acid-hydrofluoric acid mixture, and then coating with the permanganate-nitrate composition. There is also provided an anodized aluminum or aluminum alloy coated with a non-chromium permanganate composition.

REFERENCES:
patent: 4755224 (1988-07-01), Bibber
patent: 4988396 (1991-01-01), Bibber

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