The stability of anodic films potentiodynamically grown on titanium, titanium-grade 2, and Ti6Al4V alloy was studied in a\nsimulated physiological electrolyte, up to 8.0V, and at room temperature to determine the corrosion resistance levels of dental\nimplants. In PBS (phosphate buffer saline) solution, thin titanium oxide films protect the surface of the Ti6%Al4%V alloy up\nto 6.0V, pure Ti up to 8.0V, and Ti-grade 2 up to 1.5 V. At more positive potentials, localized corrosion starts to occur possibly\ndue to the alloy elements (Ti6Al4V-V and Al) and variable levels of interstitials (Ti-grade 2: C, N, and Fe, mainly). When the\nbiomaterials were submitted to open-circuit conditions, in artificial saliva, the worst corrosion resistance was observed in dental\nimplant (Ti-grade 2), according to the open-circuit potential values and reconstruction rate analysis of these oxide films. The XPS\nspectra revealed TiO2 oxide as the main phase in the barrier oxide film coating the dental implant.
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