Purpose Of Coatings

It is significant to note that surface of engineering parts and product play vital role. In case of products the surface provides appearance and might need decoration. Surface is exposed to atmosphere and handling and therefore subjected to scratches and corrosion and hence needs protection. The different kinds of coating and treatment that have been explained are capable of providing protection and appearance. The machine parts are always loaded on surface, along with maximum stress taking place on the surface as well and surface is inherently weaker than the bulk material. Just a few coatings are capable of developing strength except by ignoring corrosion or atmospheric attack. In several cases the surface coatings, though, are capable of developing wear resistance that are more likely to occur on rubbing surfaces. There is no unique solution to decorative, protective or strengthening coating. Each problem required individual consideration. Likewise, while each of surface needs thorough cleaning before applying coating, each surface and possible cleaning media and method require special consideration.