Coating for metal surfaces, method for the production thereof and use thereof as a self-cleaning protective layer, particularly for the rims of automobiles

A process for producing a self-cleaning coating for a metal surface comprising in a first step

• a.) applying a perhydropolysilazane solution comprising a catalyst and, and optionally one or more cobinders, in a solvent is to the metal surface as a base coat and in a second step
• b.) applying a protective coat to the base coat or to the metal surface directly, the protective coat comprising at least one perhydropolysilazane of the formula (1) and photocatalytic titanium dioxide
• where n is an integer such that the perhydropolysilazane has a number-average molecular weight of from 150 to 150 000 g/mol.

A coating for metal surfaces consisting essentially of

• a.) a scratch-resistant perhydropolysilazane base coat and
• b.) an upper protective coat comprising at least one perhydropolysilazane of the formula (1) and photocatalytic titanium dioxide
• where n is an integer such that the perhydropolysilazane has a number-average molecular weight of from 150 to 150 000 g/mol.

A coating for metal surfaces comprising:

• a.) a scratch-resistant perhydropolysilazane base coat and
• b.) an upper protective coat comprising at least one perhydropolysilazane of the formula (1) and photocatalytic titanium dioxide
• where n is an integer such that the perhydropolysilazane has a number-average molecular weight of from 150 to 150 000 g/mol.