Corrosion resistant aluminum coating composition

Details Corrosion resistant aluminum coating composition Corrosion resistant aluminum coating composition

1989-04-26

1991-01-29

Silverberg, Sam

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148273, 148275, C23C 2256

Patent

active

049883968

ABSTRACT:
This invention provides an aluminum alloy conversion coating composition and a process for protecting aluminum alloys, especially the alloys having greater than 1.0% Cu with a conversion coating. The coating is placed on the aluminum alloy in a multi-step process. In a first step the alloy is treated with a composition having as essential ingredients aluminum nitrate and an alkali metal nitrate, in a second step the nitrate treated alloy is treated with an alkali metal permanganate composition and in the final step the alloy is treated with an alkali metal silicate composition.
The aluminum conversion coatings of this invention are provided without the need for using toxic chromium compounds.

REFERENCES:
patent: 2127206 (1938-08-01), Curtin
patent: 3516877 (1970-06-01), Papafingos et al.
patent: 4504324 (1989-03-01), Forumo
patent: 4711667 (1987-12-01), Bibber

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