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Surface preparation effects on anodization and corrosion resistance of pure titanium grade 2

Abstract A layer of TiO2 nanotubes is widely used as a surface application on Titanium (Ti) implants because the nanotubes help promote cell adhesion and provide better cell response than the metal surface. Although several studies have reported the relationship between TiO2 nanotubes and cell osseointegration rate, the corrosion rate of the TiO2 nanotube layer under the circumstance of usage has yet to be fully evaluated. In this work, we have studied the effect of surface preparation conditions on the corrosion behavior of a TiO2 nanotube layer on a pure Ti substrate. The surface of the titanium substrate was prepared by different methods, followed by one-step anodization to obtain a TiO2 nanotube array. A surface roughness non-contact tester and field emission scanning electron microscope were used to characterize the surface roughness and surface morphology of the as-received, mechanically polished, and chemically polished substrate both pre and post anodization. The corrosion behavior of the prepared substrates was also investigated in Phosphate Buffered Saline solution using potentiodynamic polarization technique. The results suggest that surface roughness at the nanoscale of the prepared surfaces has no relationship with corrosion resistance. However, after anodization, the corrosion rate has a good relationship with the standard deviation of inner tube/pore diameter.