Metal part used in vehicles has a bearing surface with a phosphate layer and a silicate layer

摘要

Metal part has a bearing surface for a further component. The bearing surface has a coating made of a first layer of a phosphate and a second layer made of a silicate. An independent claim is also included for a process for coating the surface of metal parts comprising cleaning the surface; applying the first layer of phosphate and applying a second layer of silicate. Preferred Features: The metal part is used in a friction coupling. The first layer is made of zinc phosphate and the second layer contains sodium and/or potassium silicate.