Method for providing coating systems with corrosion-protective properties

A method for providing corrosion-protective properties to a metal surface,

• wherein the method comprises a step of applying a coating system to a metal surface to be provided with corrosion protection;
• wherein the coating system comprises a copolymer comprising moieties (i), (ii) and (iii) according to the following definition and each being different from one another:
• (i) a moiety derived from a first ethylenically unsaturated monomer, the homopolymer of which has a glass transition temperature Tg(i) ranging from 30° C. to 200° C.,
• (ii) a moiety derived from a second ethylenically unsaturated monomer, the homopolymer of which has a glass transition temperature Tg(ii) ranging from −100° C. to −10° C., and
• (iii) a moiety derived from a phosphate-group containing methacrylic monomer (PAM), wherein the phosphate-group containing methacrylic monomer (PAM) is selected from phosphates and phosphate esters of polyalkylene glycol monomethacrylates and corresponds to the following general formula (III):
• in which formula (III)
• R1 and R2, independently from each other, represent hydrogen or alkyl,
• represents a propylene radical;
• “n” is a positive integer in the range of from 2 to 200;
• wherein (iii) the phosphate-group containing methacrylic monomer (PAM), which is selected from phosphates and phosphate esters of polyalkylene glycol monomethacrylates, is a mixture of monoalkylphosphate esters of polypropylene glycol monomethacrylate and dialkylphosphate esters of polypropylene glycol monomethacrylate according to formula (III).