METHOD FOR PRODUCING A PERMANENT PROTECTIVE LAYER ON PRECIOUS METAL SURFACES BY COATING WITH SOLUTIONS BASED ON POLYSILAZANE

摘要

The invention relates to a method which is used to produce a permanent support layer on precious metal surfaces by coating solutions which are based on polysilazane. Said method is used to coat surfaces made of precious metal or precious metal alloys with a solution containing a polysilazane of formula (1), wherein n is measured in such a manner that the polysilazane has an average molecular weight from 150 - 150.000 g/mol, in addition to a solvent and a catalyst. The invention is characterised in that a silane based primer which contains sulphur and which is used to improve adherence, is applied to the object which is to be coated prior to the coating with the polysilazane solution. The invention also relates to coatings which are produced according to the inventive method.