Electrochemical Corrosion of Nano-multilayered Ti/TiN Films on 316L Stainless Steel in the Simulated Bodily Fluid

Nano-multilayered Ti/TiN films were synthesized on biomedical 316L stainless steel through the Bulat-6 arc ion plating system. The anti-corrosion performances of different films were studied elementarily in Troyde's simulated bodily fluid. The results show that it is about 5 and 2 times, for the breakdown potential of 316L+Ti/TiN in neutral and acidic Troyde's simulated bodily fluid, higher than that of 316L stainless steel, and one eighth and one third of the corrosion current density of the substrate, respectively, which indicates that the sensitivity of local corrosion for the substrate is depressed greatly. However, the delay in reverse cathodic scanning is caused by the worse self-repairable property of Ti/TiN film. The anti-corrosion performance of 316L+Ti/TiN, in Troyde's simulated bodily fluid, is improved effectively by the existence of the nano-multilayered structure and pure titanium layer.