Effect of sodium-ion implantation on the corrosion resistance and bioactivity of titanium

The corrosion resistance and bioactivity of titanium after sodium-ion implantation were examined. Polished samples were implanted with a dose of 1017 Na+/cm2 at a beam energy of 25 keV. The chemical composition of the surface layer formed during the implantation was determined by X-ray photoelectron spectroscopy (XPS) and secondary ion mass spectrometry (SIMS). The bioactivity of the samples was evaluated by soaking them in a simulated body fluid (SBF) at 37 °C for 168 and 720 h. The corrosion resistance in SBF at 37 °C was determined by electrochemical methods after exposure in SBF for various times. The results obtained indicate that sodium-ion implantation improve the corrosion resistance after short-term exposures. During an exposure in SBF, calcium phosphates precipitate on the sample surface but they do not form a continuous layer.