Anodic Growth Of Titanium Oxide: Electrochemical Behaviour And Morphological Evolution
- A. Mazzarolo, M. Curioni, A. Vicenzo, P. Skeldon, G. E. Thompson
- Electrochimica Acta
Anodizing is an electrolytic passivation process used to increase the thickness of the natural oxide layer on the surface of metal parts. Aluminum is ideally suited to anodizing, although other nonferrous metals, such as tantalum and titanium, can also be anodized. Titanium is used as a biocompatible material in human implants due to its excellent corrosion and wears resistance. Stable, continuous, highly adherent, and protective oxide films can be developed on titanium using various acid or alkaline baths. Anodizing of titanium generates a spectrum of different color without use of dyes. This spectrum of color dependent on the thickness of the oxide, interference of light reflecting off the oxide surface and reflecting off the underlying metal surface. The anodized film of Titanium is mainly consists of TiO2 or mixtures of TiO2 & Ti2O3 etc. In the present work, Pure Titanium plate has been anodized using bath of KOH at different voltage ranges. The anodized film is characterized by visual observation, SEM & EDAX analysis & A.C impedance spectroscopy, while the corrosion studies were performed using salt spray test & potentiodynamic studies. Result of various studies shows that Anodized film was mainly consisting of TiO2 and Ti2O3, having spectrum of colors from BlueYellow-Purple-Green. The film is more compact, adherent and more uniform due to which it exhibits good corrosion resistance.