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Highlights
CrN single-layer coating and CrN/Cu multilayer nanostructured coating were successfully applied on AISI 304 stainless steel using by CAE-PVD.
SEM images showed that in both CrN and CrN/Cu coatings there are pinholes and macro-particles from melted cathode.
Nanoindentation test showed that hardness and elastic modulus of CrN and CrN/Cu coatings were 19.5 ± 2.1, 248 ± 18, 16.1 ± 0.84, and 287 ± 3 GPa.
Polarization resistance of both coatings in the Ringer solution was improved.
Antibacterial tests showed that both coatings have antibacterial behavior and CrN/Cu coating compared to CrN coating reduces the bacterial number even more after 3 h owing to the presence of Cu.