Nonchromated, primer-free, surface preparation for painting, pow

Details Nonchromated, primer-free, surface preparation for painting, pow Nonchromated, primer-free, surface preparation for painting, pow

1995-05-23

2000-09-26

Sheehan, John

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

C23C 2256

Patent

active

061237825

ABSTRACT:
An improved method of providing a protective coating on the surface of aluminum or aluminum alloys comprising: alkaline-cleaning the surface using a nonchromated and nonsilicated alkaline cleaner, following by a rinse in hot water; (b) deoxidizing the surface by immersion thereof in a nonchromated deoxidizer at room temperature, followed by a rinse in hot water; and (c) immersing the surface in boiling water for a period of time. Following the immersion step, the aluminum-containing part may be painted, powder-coated, or adhesive-bonded without requiring any wash primers to activate the substrate. Further, the part may be stored indefinitely in an acid-free paper that does not leave any residues. The only treatment required before painting, powder-coating, or adhesive bonding is a removal of any fingerprints in a suitable solvent such as acetone or iso-propyl alcohol.

REFERENCES:
patent: 3380860 (1968-04-01), Lipinsk
patent: 3544391 (1970-12-01), Scott
patent: 4451304 (1984-05-01), Batick
patent: 4711667 (1987-12-01), Bibber
patent: 4759805 (1988-07-01), Saruwatari
patent: 5052421 (1991-10-01), McMiller
patent: 5192374 (1993-03-01), Kindler
"Cerium Conversion Coatings for the Corrosion Protection of Aluminum", Materials Forum, vol. 9, No. 3, pp. 162-173 (1986).

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