US 8,557,096 B2 · Multistage method for treating metal surfaces prior to dip painting

Abstract

The present invention relates to a multistage method for the corrosion-protective and adhesion-promoting treatment of metal surfaces, comprising a first method step for passivating pretreatment using an acidic aqueous composition (A) containing water-soluble compounds of Zr and/or Ti and fluoride ions, a subsequent method step for post-treatment using an aqueous composition (B) containing at least one organic compound having at least one aromatic heterocyclic compound, wherein the aromatic heterocyclic compound has at least one nitrogen atom. The invention further relates to a metal surface treated according to the method according to the invention and the use of said treated metal surface for subsequent coating with an organic binding agent system.

Claims10

Dependent claims

A method for corrosion-protective treatment of a metal surface, in which method at least the following steps are carried out successively:

i) optionally, cleaning and degreasing the metal surface;
ii) passivating pre-treating the metal surface by bringing it into contact with an acidic aqueous composition (A) containing
a) water-soluble organic compounds of Zr and/or Ti, and
b) water-soluble inorganic fluorine compounds that release fluoride ions;
iii) post-treating the pretreated metal surface by bringing it into contact with an aqueous composition (B), containing
at least one organic compound having at least one aromatic heterocycle, the aromatic heterocycle comprising at least one nitrogen atom and selected from the group consisting of triazole, benzotriazole, imidazole, quinoline, and indole.

3 more elements

Dependencies are inferred from the claim text.

Multistage method for treating metal surfaces prior to dip painting

Life of this patent

Multistage method for treating metal surfaces prior to dip painting

Life of this patent

Abstract

Claims10