Study of anodic oxide films of titanium fabricated by voltammetric technique in phosphate buffer media

The corrosion process is one of the main factors affecting the biocompatibility and mechanical integrity of an implant material. This study examined the anodic oxide films produced on titanium metal using cyclic voltammetric method. The oxide films were produced potentiodynamically at room temperature from a potential ranging from -1.0 to +5.0 V, at a scan rate of 50mVs^-1 in a phosphate buffer solution at pH 2, 7, and 12. After oxide growth, the films were subjected to different repetitive potentiodynamic cycles at 50mVs^-1 between the pre-set cathodic and anodic potentials. The changes in the electrochemical behaviour of the passive electrode, particularly the corrosion of the metal were followed as a function of the electrolyte pH and the number of potentiodynamic cycles. The corrosion of metal surface was severe at pH 2 and increases with increasing number of cycles whereas invariable at pH 7 and in decreasing order at pH 12 as the number of cycle increased. In addition, the surface roughness of modified surfaces was varied as like corrosion of metal as the number of cycles increased.