The purpose of this study is to synthesize and characterize nano-sized Titania (TiO 2 ), Zinc Oxide (ZnO) and its composite coating on Ti-6Al-4V to enhance its corrosion protection behaviour in Ringer's solution. Nano-sized powders of TiO 2 and ZnO was characterized by FTIR, powder XRD, EDAX and SEM analysis. As a result of antibacterial activity, both ZnO and TiO 2 /ZnO have produce remarkable inhibition zone on E.coli. The anti-bacterial activity of composites are due to the combined effect of ZnO on TiO 2 . The adherence and surface uniformity of TiO 2 /ZnO composite film on Titanium implant was examined by optical microscopy and Vickers microhardness test. Corrosion resistant behaviour of the coating on Titanium implant was investigated by tafel Polarization and Impedance analysis. The composite coating on Ti-6Al-4V have produced improved corrosion resistance with a pronounced shift in the anodic corrosion potential (E corr ) with a corresponding less corrosion current density (I corr ) compared to monophase coating. Similar results have been obtained for impedance analysis which indicated an reduction in double layer capacitance (C dl ) and with enhancement in charge Downloaded by [UNSW Library] at 23:33 11 August 2015 2 transfer resistance (R ct ). These observations suggest improved corrosion resistance property of TiO 2 /ZnO composite coating on Ti-6Al-4V.
Synthesized composite powders (ZrO 2 /TiO 2 , SiO 2 /TiO 2 , and SiO 2 /ZrO 2) were successfully deposited on Ti-6Al-4V by electrophoretic deposition method (EPD) to improve its electrochemical characteristics for better biomedical applications. In the present investigation, the three composite powders were prepared by sol-gel synthesis and its phase purity was analyzed by Powder X-ray diffraction (XRD) method. Further, the performance of the deposited coatings was assessed by scanning electron microscopy (SEM) coupled with energy dispersive X-ray analysis (EDAX), scratch resistance test. The electrochemical properties of the composite coatings were analyzed by Potentiodynamic (Tafel) polarization and electrochemical impedance spectroscopy (EIS) studies. From the results, we observed that the corrosion resistance behavior of the different composite coated metallic substrate exhibited divergent corrosion resistance nature than blank Ti-6Al-4V. Of all these coatings on Ti-6Al-4V, the composite made up of, ZrO 2 /TiO 2 has pronounced corrosion resistance behavior in Ringer's solution when compared to others. This behavior is due to the presence of strong adherent coating owing to the existence of uniform deposition on Ti-6Al-4V.
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