Patent ID: 6306226
Filing Date: 2001-10-23
Classification: B05D,C23C,C23F,C23G,F28D,F28F

Abstract:
A process for surface-treating an aluminum-containing metal material, comprising the steps of:chemically etching at least a portion of a surface of an aluminum-containing metal material to an extent such that the material exhibits a reduction in weight of 0.02 to 20 g/m.sup.2 ;applying a chemical conversion treatment to the chemically etched surface of the aluminum-containing metal material with a chemical conversion treating liquid containing at least one member selected from the group consisting of zirconium phosphate and titanium phosphate, to form a first protective layer; andforming a second protective layer containing a hydrophilic resin cross-linked with a cross-linking agent on the first protective layer,wherein the cross-linking agent comprises at least one member selected from chromium compounds, zirconium compounds and titanium compounds; the cross-linked hydrophilic resin contained in the second protective layer comprises (a) non-cross-linked hydrophilic functional groups selected from the group consisting of primary amino groups, secondary amino groups, tertiary amino groups, quaternary ammonium salt groups, an amide group, a carboxyl group, a sulfonic acid group, phosphoric acid group and a hydroxyl group, and being non-reactive to the cross-linking agent; and (b) reactive functional groups being reactive to the cross-linking agent, selected from the group consisting of an amide group, a hydroxyl group and a carboxyl group, and being different from the hydrophilic functional groups (a); and at least a portion of the reactive functional groups (b) is cross-linked with the cross-linking agent.