On the stability of thin-anodic-oxide films of titanium in acid phosphoric media

Evaluation of bone-implant interfaces on iso5832-9 and ti6al4v alloys after thin-anodic oxide film growth

“…Thus, the titanium oxide formed on the surface of the Ti6Al4V alloy was stable and not to reduces due to the absence of a peak in the cathodic region. The oxide grown up to 5.0 V showed a thickness around 12.5 nm, as also described in the literature (Marino et al, 2001). However, the natural oxide grown spontaneously on the Ti alloys was around 2.0 nm in thickness (Marino et al, 2001).…”

“…Some studies have shown that thicker oxide films are formed on the Ti and Ti alloys by applying a steady potential or current (Novaes et al, 2010;Lin et al, 2013;Szesz et al, 2013). Nevertheless, using the potentiodynamic method, it is possible to obtain anodic oxides with thin layers, improving their electrochemical parameters and also enhancing their stability properties (Marino & Mascaro, 2004;Marino et al, 2001). It has been shown that the composition, structure and thickness of the films determine their stability and bioactivity (Villamil et al, 2002).…”

Effects of plasma immersion ion implantation (PIII) of nitrogen on hardness, composition and corrosion resistance of Ti-6Al-4V alloy

“…2-4), the polarization curves showed an apparent active/passive region. Ramires et al [10] inferred that this process is associated with the increase of the oxide layer thickness on the surface, while Marino et al [11] related it to the formation of the secondary oxide or a phase transformation induced during the potentiodynamic scan. Anyway, a second passive region above 1.6 V was only evidenced for the PIII-treated samples while for the untreated specimen the corrosion current density increased rapidly above 2.5V.…”

Growth and Electrochemical Stability of Compact Tantalum Oxides Obtained in Different Electrolytes for Biomedical Applications

“…Although the potential was applied for one hour in potentiostatic condition, the results indicated that time have no effect on the measured equilibrium potential. Thus, the anodic oxide growth on tantalum surfaces follows the High Field Model and its growth rate is mainly function of the applied potential and constants that are typical to every oxide 20 . As described in Marino's research 20 with anodic charges of the Ti-oxide growth, the anodization rate was determined by electrochemical methods and was found to be 2.5 nm/V.…”