Anodic oxidation of titanium in a H
3PO
4/H
2O
2 solution using alternating current was investigated. Treated titanium specimens served as both an anode and a cathode, and potential was applied up to 130 V. Surface films with different interference colors were formed on titanium as a function of the applied voltage. Adhesion of the surface film to the parent titanium metal was excellent. XPS analysis suggested that titanium phosphate with bound water was formed in the outermost surface, and titanium oxide (TiO
2) was formed in the following outer surface. The thickness of the surface oxide film was approximately 3,000 Å at AC 100 V. X-ray diffractory analysis revealed that amorphous anatase (Ti0
2) was formed by anodic oxidation which was crystallized after heat treatment.
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