Multi-layered Ti/TiN films

single layer TiN films and gradient TiN films were deposited on uranium substrates by arc ion plating.The anodic polarization experiments in 50 μg/g Cl- solution indicate that E corr of the sample at a pulse bias of ?800 V increases to about 714 mV

with an I corr decrease of about two orders of magnitude.Studying on electrochemical corrosion mechanisms indicates that single layer films and gradient films become inactive by defect penetration through the substrate

hence decreased corrosion-resistance;while the inactivation of multi-layer films is due to layer malfunction

which makes it difficult for corrosive substances to reach the substrate.In this way the corrosion resistance is enhanced.