US 11,761,092 B2 · Method for corrosion-protective and cleaning pretreatment of metallic components

Abstract

The present invention relates to a method for the corrosion-protective and cleaning pretreatment of metallic components, produced at least partially from metallic materials from the elements iron, zinc and/or aluminum, with the use of an acid aqueous composition containing, in addition to the water-soluble compounds of the elements Zr and/or Ti causing the conversion of the metal surface, a mixture of an aliphatic diol and an aliphatic saturated polyhydroxy compound. It also comprises a chrome(VI)-free aqueous composition based on the constituents mentioned above which delivers outstanding results in cleaning and simultaneous corrosion-protective conversion of technical metal surfaces in one method step.

Claims31

Dependent claims

A method for cleaning and anti-corrosion pretreatment of a metal component which is at least partially composed of a material that consists predominantly of one or more of the metals iron, zinc and/or aluminum, comprising contacting the metal component with an acidic aqueous composition containing components:

a) at least 0.003 wt. % of aliphatic diols having at least 4 carbon atoms but no more than 10 carbon atoms;
b) at least 0.01 wt. % of aliphatic saturated polyhydroxy compounds having at least 4 but no more than 8 carbon atoms;
c) at least one water-soluble compound of Zr and/or Ti;
d) at least one water-soluble source of fluoride ions.

1 more element

Dependencies are inferred from the claim text.

Method for corrosion-protective and cleaning pretreatment of metallic components

Life of this patent

Method for corrosion-protective and cleaning pretreatment of metallic components

Life of this patent

Abstract

Claims31