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1. (WO2018050506) IMPROVED PROCESS FOR CORROSION-PROTECTING PRETREATMENT OF A METALLIC SURFACE CONTAINING STEEL, GALVANIZED STEEL, ALUMINUM, AN ALUMINUM ALLOY, MAGNESIUM AND/OR A ZINC-MAGNESIUM ALLOY

Pub. No.:    WO/2018/050506    International Application No.:    PCT/EP2017/072316
Publication Date: Fri Mar 23 00:59:59 CET 2018 International Filing Date: Thu Sep 07 01:59:59 CEST 2017
IPC: C23C 22/34
C23C 22/44
C23C 22/78
C23C 22/83
B05D 7/16
C09D 5/08
Applicants: CHEMETALL GMBH
Inventors: BIRKENHEUER, Stefan
CHMIELEWSKI, Dietmar
HECKER, Carina
SAUER, Oliver
SCHATZ, Daniel
Title: IMPROVED PROCESS FOR CORROSION-PROTECTING PRETREATMENT OF A METALLIC SURFACE CONTAINING STEEL, GALVANIZED STEEL, ALUMINUM, AN ALUMINUM ALLOY, MAGNESIUM AND/OR A ZINC-MAGNESIUM ALLOY
Abstract:
The present invention relates to an improved process for corrosion-protecting pretreatment of a metallic surface containing steel, galvanized steel, aluminum, an aluminum alloy, magnesium and/or a zinc-magnesium alloy in which the metallic surface is contacted i) with an acidic aqueous composition A comprising a1) at least one compound selected from the group consisting of titanium, zirconium and hafnium compounds and ii) with an aqueous composition B comprising b1) at least one (meth)acrylate resin and b2) at least one phenol resin, wherein the metallic surface is contacted first with the composition A and then with the composition B and/or first with the composition B and then with the composition A and/or simultaneously with the composition A and the composition B. The invention further relates to a corresponding aqueous composition B, to a nonaqueous concentrate for producing this composition, to a correspondingly coated metallic surface and to the use of a correspondingly coated metallic substrate.