Chromium-free method and composition to protect aluminum

Details Chromium-free method and composition to protect aluminum Chromium-free method and composition to protect aluminum

1991-09-27

1993-03-09

Beck, Shrive

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148273, 148275, C23C 2256

Patent

active

051923742

ABSTRACT:
An method of providing a protective coating on the surface of aluminum or aluminum alloys, comprising: removing contaminants from the surface; exposing the surface to water at 50.degree. to 100.degree. C. to form a porous boehmite coating on the surface; and exposing the boehmite-coated surface to an aqueous solution comprising a cerium salt and a metal nitrate at a temperature of 70.degree. to 100.degree. C. Oxides and hydroxides of cerium are formed within the pores of the boehmite to provide the protective coating, which provides corrosion resistance and improved paint adhesion.

REFERENCES:
patent: 2512493 (1950-06-01), Gide
patent: 4711667 (1987-12-01), Bibber
patent: 4878963 (1989-11-01), Bibber
patent: 4988396 (1991-01-01), Bibber
patent: 4992115 (1991-02-01), Ikeda
Hinton et al., "Cerium Conversion Coatings for Corrosion Protection of Aluminium", Materials Forum, vol. 9, No. 3 (1986), pp. 162-173.

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