Corrosion behavior of NiTi alloys coated with diamond-like carbon (DLC) fabricated by plasma immersion ion implantation and deposition

A dense and well-adhered diamond-like carbon (DLC) coating was prepared on NiTi alloys by plasma immersion ion implantation and deposition (PIIID). Electrochemical impedance spectroscopy and potentiodynamic polarization tests indicated the corrosion resistance of the NiTi alloys was markedly improved by DLC coating.