Painting nitride surface
Painting nitride surface
(OP)
Need advice on prepping for paint a small metal part that has been through a nitride process. Also, any suggestions on paint type and curing method? Painted area is only .10" diameter dot, but subjected to heat and recoil motion.





RE: Painting nitride surface
RE: Painting nitride surface
We are painting the nitride part now, and the primer paint is falling during use of the part. We are using same paint as past ten years, only difference is prior parts were black oxide instead of nitride.
RE: Painting nitride surface
RE: Painting nitride surface
Are you prepping the nitrided surface properly for paint? It may be necessary to mask the surrounding area and mechanically abrade (light grit blast or similar) the .10" dia surface to get best paint adhesion. You might also consider laser engraving a shallow depression (~.001" deep) for the paint dot, provided the dot is not located in a sensitive area. This will help protect the edge of the paint dot from peeling.
As for other coating options, there are some very durable mil-spec epoxy ink compounds designed specifically for part marking on metal surfaces.
Hope that helps.
Terry