Engineering Functional Surfaces through Anodic Oxidation

Anodic oxidation of titanium is an electrochemical surface treatment that enables controlled growth of a titanium dioxide (TiO₂) layer through anodic polarization in an electrolytic environment. The resulting oxide film enhances surface performance by improving corrosion resistance, biocompatibility, and optical response, thereby extending the applicability of titanium across aerospace, biomedical, architectural, and advanced design sectors.

A distinctive feature of anodically oxidized titanium is the formation of interference colors, originating from nanometric variations in oxide thickness and light–matter interaction. These effects allow precise and reproducible tuning of surface appearance without the use of pigments or coatings, offering a robust strategy for functional surface modification.

This work examines the relationship between anodizing parameters, oxide growth behavior, and resulting surface properties, with particular attention to the role of surface condition and processing routes. Experimental investigations were conducted by integrating laboratory-scale anodizing with engineering manufacturing techniques, including additive manufacturing and mechanical surface finishing, in order to evaluate their influence on oxide formation and color uniformity.

The results demonstrate that anodic oxidation can be effectively combined with advanced manufacturing processes to produce titanium surfaces with tailored functional and optical characteristics. This approach highlights the potential of electrochemical surface engineering as a versatile tool for controlling titanium surface properties.