Patent ID: 6436475
Filing Date: 2002-08-20
Classification: C23C

Abstract:
A process of treating of zinc, magnesium or aluminum or of the alloys of zinc, magnesium or aluminum surfaces for application of lacquers, plastic coatings, paints, sealing compounds or adhesives comprising the steps of:subjecting a metallic surface comprising at least one metal selected from the group consisting of zinc, zinc alloy, magnesium, magnesium alloy, aluminum and aluminum alloy to at least one of an alkaline pickling bath or an acid pickling bath; rinsing the pickled metallic surface with water; applying a film to said metallic surface by treating the metallic surfaces at 10 to 100Â° C. by at least one of dipping, spraying and rolling with an aqueous solution having a pH from 2 to 13, said solution comprising 10âˆ’5 to 1 mol/l of at least one compound of the formula XYZ, wherein Y is a straight-chain organic group of 2 to 50 carbon atoms; X is a COOHâ€”, HSO3â€”, HSO4â€”, (OH)2POâ€”, (OH2)PO2â€”, (OH)(ORâ€²)POâ€” or (OH)(ORâ€²)PO2; and Z is OHâ€”, SHâ€”, NH2â€”, NHRâ€²â€”, CNâ€”, CH&boxH;CH2â€”, OCNâ€”, CH2&boxH;CRâ€³â€”COOâ€”, acrylamide, (OH)2POâ€”, (OH)2PO2â€”, (OH)(ORâ€²)POâ€” or (OH)(ORâ€²)PO2; Râ€² is a C1 to C4 alkyl group; Râ€³ is a hydrogen atom or an alkyl group with 1 to 4 carbon atoms; wherein groups X and Z are each bound to the group Y in their terminal position; wherein said at least one compound of formula XYZ comprises at least one of a phosphoric acid group, a phosphonic acid group, an amino group and a thiol group and bonds to said metallic surface to form said film.