Patent ID: 8153199

Claim:
A coating on a metal or oxidic metal surface for preventing scaling and corrosion on said surface, wherein the coating comprises at least one polysilazane selected from the group consisting of a perhydropolysilazane the formula 1, a polysilazane of the formula 2 and mixtures thereof, n being an integer and being dimensioned such that the at least one polysilazane has a number-average molecular weight of 150 to 150 000 g/mol, a solvent, and a catalyst, and, at least one cobinder, wherein the at least one cobinder is an organopolysilazane of the formula 3 —(SiR′R″—NR′″) n2 — (3) where R′, R″, and R′″ are identical or different and the radicals are either hydrogen or unsubstituted or substituted organic radicals, with the proviso that R′, R″, and R′″ must not simultaneously be hydrogen, n2 being dimensioned such that the organopolysilazane has a number-average molecular weight of 150 to 150 000 g/mol, with the proviso that the mass fraction of the organopolysilazane, based on the perhydropolysilazane of formula (1) or the polysilazane of formula 2, is at least 1% and not more than 100%.