the key to the PVD coatings firstly is the quantity for each coating,
secondly the thickness requested.
TiN or TiNC must be most cost effective.
compare to the other processes, based on your requirement, I do think PVD coatings is quite a good way.
well, if possible, I would like to help you.
PVD coatings would be a good choice for your project.
the cost effective coatings might be
TiN- bright golden (recommended)
TiNC-mauve
CrN- bright white
TiC-gray-light-dark-black
the substrate should be polished if you need a good finish
excellent hardness, abrasion and scrach resistance.
I found the corrosion resistance of PVD coatings TiN is highly affected the features of underlay itself, film thickness and component
3Cr13 cuttings by column arc PVD coating TiN 50 min,thickness about 1 u,
Salt Water marinate resistance for 6 hours, some rusted.
with pure Ti 15 minute below...