The electrochemical anodization of titanium has received a lot of attention in recent years, especially for its application for biomedical purposes, offering a biocompatible titanium oxide with architecture of a large energy surface, and highly controllable nanoscale characteristics.In this work, TiO2 layers were synthesized on a well-polished titanium surface, by the anodizing technique, under a voltage of 20 V, for 15, 30 and 45 minutes respectively, using as specific electrolyte: 1M CH3COOH /1M Na2SO4/0.5 Wt% NaF.Interfacial integrity and variation of elemental composition along the interface were studied by scanning electron microscopy (SEM), equipped with an energy dispersive X-ray analyzer (EDX). Electrochemical behaviour was studied both by measuring the evolution of open circuit potential (OCP), by electrochemical impedance spectroscopy (EIS), and by linear polarization (LP) in Hank's solution as a physiological environment. The nature of the crystalline phase formed during the annealing treatment was demonstrated by Raman spectroscopy and X-ray diffraction (XRD) technique. SEM characterization reveals uniform and vertically aligned networks of TiO2 nanotubes (TiO2-NT) on titanium substrates, without a significant effect of anodization time on the diameter of the nanotubes. On the other hand, the EIS measurements show a significant improvement in corrosion behaviour.Keywords: Anodic oxidation, EIS, Ti6A4V, DRX, biocompatibility
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