Abstract: Described herein is an improved process for anticorrosion pretreatment of a metallic surface including steel, galvanized steel, aluminum, an aluminum alloy, magnesium and/or a zinc-magnesium alloy, wherein the metallic surface is brought into contact with i) an acidic aqueous composition A which includes a1) at least one compound selected from the group consisting of titanium, zirconium and hafnium compounds, and with ii) an aqueous composition B which includes b1) at least one (meth)acrylate resin and b2) at least one phenol resin, where the metallic surface is brought into contact firstly with the composition A and then with the composition B and/or firstly with the composition B and then with the composition A and/or simultaneously with the composition A and the composition B.

Abstract: Described herein is an improved process for an anticorrosion pretreatment of a metallic surface including steel, galvanized steel, aluminum, magnesium and/or a zinc-magnesium alloy, wherein the metallic surface is brought into contact with an aqueous composition A including a) from 0.01 to 0.5 g/l of a copolymer and the metallic surface is brought into contact with an acidic aqueous composition B including b1) a compound selected from the group consisting of titanium, zirconium and hafnium compounds, wherein the metallic surface is brought into contact i) firstly with the composition A and then with the composition B, ii) firstly with the composition B and then with the composition A and/or iii) simultaneously with the composition A and the composition B. Also described herein is a corresponding aqueous composition A, an aqueous concentrate for producing this composition, a correspondingly coated metallic surface and a method of using a correspondingly coated metallic substrate.

Abstract: Described herein is a method for treatment of a metallic surface, including the step of contacting the metallic surface with an acidic aqueous composition. Also described herein is an acidic aqueous composition used in the method for treatment, a master batch to produce such acidic aqueous composition, a method of using the acidic aqueous composition to treat metallic surfaces and substrates including the thus treated metallic surfaces.

Abstract: Described herein is a method for treatment of a metallic surface, including the step of (A) contacting the metallic surface with a first aqueous composition, and a subsequent step of (B) contacting the metallic surface subsequent to step (A) with a second aqueous composition. Also described herein is a kit-of-parts including the first and second aqueaous compostition and a kit-of-parts including master-batches of the first and second aqueous compostions. Also descibed is a method of using the kit-of-parts for treating a metallic surface and substrates including the thus treated metallic surfaces.

Abstract: Described herein is an improved process for an anticorrosion pretreatment of a metallic surface including steel, galvanized steel, aluminum, magnesium and/or a zinc-magnesium alloy, wherein the metallic surface is brought into contact with an aqueous composition A including a) from 0.01 to 0.5 g/l of a copolymer and the metallic surface is brought into contact with an acidic aqueous composition B including b1) a compound selected from the group consisting of titanium, zirconium and hafnium compounds, wherein the metallic surface is brought into contact i) firstly with the composition A and then with the composition B, ii) firstly with the composition B and then with the composition A and/or iii) simultaneously with the composition A and the composition B. Also described herein is a corresponding aqueous composition A, an aqueous concentrate for producing this composition, a correspondingly coated metallic surface and a method of using a correspondingly coated metallic substrate.

Abstract: Described herein is an improved process for anticorrosion pretreatment of a metallic surface including steel, galvanized steel, aluminum, an aluminum alloy, magnesium and/or a zinc-magnesium alloy, wherein the metallic surface is brought into contact with i) an acidic aqueous composition A which includes a1) at least one compound selected from the group consisting of titanium, zirconium and hafnium compounds, and with ii) an aqueous composition B which includes b1) at least one (meth)acrylate resin and b2) at least one phenol resin, where the metallic surface is brought into contact firstly with the composition A and then with the composition B and/or firstly with the composition B and then with the composition A and/or simultaneously with the composition A and the composition B.