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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|
|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|
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.