Multi-Step Method for Electrodeposition

A method of anticorrosion coating of surfaces of a metal component, comprising:

• a) subjecting a surface of a metal component to a conversion treatment by contacting the surfaces of the metal component with an acidic aqueous composition containing water-soluble compounds of the elements zirconium and/or titanium, thereby forming a conversion-treated surface of the metal component comprising a zirconium and/or titanium layer density of at least 10 mg/m2 created directly on the surface of the metal component;
• b) performing a reaction rinse following the conversion treatment, with or without an intermediate rinsing and/or drying step, by contacting the conversion-treated surface of the metal component with an aqueous composition, having a pH no lower than 8 and no higher than 10, and comprising at least one surface-active substance comprising at least one nonionic surfactant selected from alkoxylated alkyl alcohols, said at least one surface-active substance optionally further comprising at least one alkoxylated fatty amine;
• and
• c) following the reaction rinse of b), with or without an intermediate rinsing and/or drying step, treating the conversion-treated surface of the metal component by electro-dip coating.