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A study on biocompatibility of TiN thin films deposited by dual-energy ion beam assisted deposition

Titanium nitride thin films were deposited on 317L stainless steel (SS317L) substrate by dual-energy Ion Beam Assisted Deposition (IBAD). The composition of the TiN films was investigated by Auger Electron Spectroscopy (AES), while the structural characteristics of the films were determined by X-ray diffraction (XRD). A Micro Scratch Tester (MST) was employed to measure the film adhesion. The results show that TiN thin films cause significant changes in the structural and mechanical properties of the substrate surface. The corrosion resistance analysis performed using the electrochemical corrosion method in Hanks' simulated human plasma showed that free corrosion potential (E corr) and breakthrough potential for pitting corrosion (E b) for TiN thin films were increased as compared to those of the control SS317L. The results of the fibroblast and marrow cell cultures in vitro showed that TiN coatings exhibited a higher degree of cytocompatibility than that of the control SS317L.