How does surface finish affect coatings?
Metal surface finish also will affect coating performance. A finer surface finish will allow a more uniform layer of coating to be applied. In general, you should specify a slightly better surface finish than usual. This will ensure maximal coating adhesion, toughness, and lubricity. An exception to this would be applications that require friction, such as thread rolling dies. In these cases, talk to a Phygen coating expert about strategies for increasing friction while improving toughness.
