Corrosion resistance of TiN coatings produced by various dry processes

The corrosion resistance of a titanium nitride surface prepared by plasma-based ion implantation (PBII) was compared with that of titanium nitride coating films prepared by sputtering deposition, plasma spraying, and shielded vacuum arc deposition. The corrosion test with the potentiodynamic polarization curve shows that the PBII sample had the best corrosion resistance. The SEM observation indicates that there was no pinhole on the titanium nitride surface prepared by PBII. However, a lot of pinholes were observed in the titanium nitride coating films prepared by the other dry coating processes.