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Ingeniare. Revista chilena de ingeniería

versión On-line ISSN 0718-3305

Resumen

MUNOZ-MIZUNO, Andrea et al. Effect on thermal oxidation in TiO2 nanostructures on nanohardness and corrosion resistance. Ingeniare. Rev. chil. ing. [online]. 2020, vol.28, n.3, pp.362-372. ISSN 0718-3305.  http://dx.doi.org/10.4067/S0718-33052020000300362.

This article aimed to analyze the effect of the thermal oxidation in the corrosion resistance and the hardness properties of TiO2 nanostructures obtained by the anodizing process in the HF/H3PO4 solution TiO2 nanostructures on Ti6Al4V obtained by anodizing processes were subjected to thermal oxidation (TO) treatments over a temperature range from 500 °C to 620 °C for 2 hours. Surface morphology was evaluated by using scanning electron microscopy; the hardness properties of TiO2 nanostructures were obtained by Nanoindentation measurements using a Berkovich probe with a tip radius of 150 mm. The corrosion behavior of the samples was studied using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The results showed that TiO2 nanostructures, modified by thermal oxidation, increased the surface properties of hardness and corrosion resistance, compared to the substrate, maintaining its mixed or tubular structure. On the other hand, a transformation of nanotubes to nanopores after 600°C was evidenced, generating significant changes in the mechanical properties of these structures.

Palabras clave : Nanostructures; TiO2; nanohardness; EIS; thermal oxidation.

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