Patent ID: 6338876
Filing Date: 2002-01-15
Classification: B05D,F28F

Abstract:
A process for hydrophilic treatment of an aluminum material which comprises a step for priming wherein a primer containing 3.5 to 22.5 g/l as solids concentration of water-soluble acrylic acid-based polymers, 1.0 to 5.0 g/l of a hydrofluoric acid-based compound as elemental fluorine, 5 to 30 g/l of an organic reducing agent, and a nitrate or related compound of a metal selected from aluminum, zirconium, cerium, chromium, and iron is applied to the surface of an aluminum material so that the amount of adhering metal becomes 1.0 mM/M2 or more and then the primer is baked by heating at 100 to 300Â° C. to form a film of the primer and a step for coating wherein a hydrophilic coating is applied to the film of the primer formed in said step for priming and then baked by heating at 200 to 300Â° C. to form a hydrophilic film.