Anodizing of Ti and Ti Alloys for Different Applications: A Review

Titanium has low density, high strength to weight ratio and excellent corrosion and wear resistance. When titanium is suspended in an electrolytic bath as an anode and a current is passed through the bath, oxygen is produced at the anode surface. This oxygen combines with the titanium to form titanium oxide. The interference taking place between the oxide and light results in the appearance of colors on the metal surface and oxides with different thickness generate different colors. This passive oxide film formed on titanium surface is responsible for its high corrosion resistance. Thus it has wide range of applications in aerospace, automotive and biomedical industries. This paper presents a review of pure anodized titanium and its alloy, to evaluate optimum conditions of anodizing treatment for different application that is when various parameters of anodizing process are changed such as time of anodizing, bath composition and voltage are changed.