Thermally oxidized titania nanotubes enhance the corrosion resistance of Ti6Al4V.
作者： Sweetu Patel , Dmitry Royhman , Tolou Shokuhfar , Cortino Sukotjo , Christos Takoudis
DOI: 10.1016/J.MSEC.2015.10.056
关键词: Chemical engineering 、 Metallurgy 、 Thermal oxidation 、 Corrosion 、 Passivation 、 Anatase 、 Anodizing 、 Oxide 、 Materials science 、 Polarization (electrochemistry) 、 Titanium
摘要: The negative impact of in vivo corrosion metallic biomedical implants remains a complex problem the medical field. We aimed to determine effects electrochemical anodization (60V, 2h) and thermal oxidation (600°C) on corrosive behavior Ti-6Al-4V, with serum proteins, at physiological temperature. Anodization produced mixture anatase amorphous TiO2 nanopores nanotubes, while annealing process yielded an anatase/rutile nanotubes. surface area was analyzed by Brunauer-Emmett-Teller method estimated be 3 orders magnitude higher than that polished control samples. Corrosion resistance evaluated parameters open circuit potential, current density, passivation polarization equivalent modeling. Samples both anodized thermally oxidized exhibited shifts potential noble direction, indicating more stable nanoporous/nanotube layer, as well lower densities smooth control. They also showed increased diffusion limited charge transfer within bulk oxide layer. treatment groups studied can ordered from greatest least Anodized+Thermally Oxidized > Anodized Smooth Thermally for conditions investigated. This study concludes has prevent long term implant failure due in-vivo environment.
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