Investigation of corrosion behavior of Ti/TiN multilayer coatings created by High Vacuum Magnetron Sputtering on 7075 Aluminum Alloy

Nitride multilayer coatings created by Physical Vapor Deposition (PVD) method has shown a good trend in improving corrosion resistance. In this research, corrosion performance of Ti/TiN multilayer coatings with 1.5 µm in thickness which created by High Vacuum Magnetron Sputtering on 7075 Aluminum Alloy substrate was investigate.  Presence of TiN, TiOxNy and TiO2 phase in the cross-section of multilayer coatings was confirmed by XPS analysis. Creation of uniform coatings with tough surface with smooth grains by FESEM microscope and surface roughness of 142Å by AFM microscope was confirmed. Electrochemical Impedance Spectroscopy (EIS) results was proved desirable corrosion behavior of the Ti/TiN coatings. Resistance changes for coated samples was in range of 1984-808.5  witch in comparison with uncoated sample with 84.3 in resistance was shown remarkable increase in corrosion resistance between 9.6-23 times.