Anodic corrosion behavior of nanostructured TiN, TiO2 single layer and TiN/TiO2 multilayer coated 316L SS

Single and multi layer TiN, TiO₂ thin films were deposited by DC magnetron sputtering technique using a mixture of Ar as sputtering gas O₂, N₂ as a reactive gases. The hard coatings deposited by PVD methods can have different phases and grain structures which is generally composed of columnar crystals from the transition layer to the coating surfaces. Results from the electrochemical polarization and impedance studies showed the favorable behavior of the TiN, which have improved the corrosion resistance property followed by TiN/TiO₂ multilayer, TiO₂ and uncoated 316L SS in presence of artificial blood plasma with and without addition of amino acids. Hemocompatibility was performed to analyze the materials biocompatibility. Coated thin films showed better compatibility than uncoated films. TiO₂ exhibited highly hydrophilic in nature than other films. These nanostructure coatings were confirmed by XRD and AFM.