Corrosion Analysis and Apatite Forming Ability of Ti and Ti-Alloys in SBF Solution

Abstract

Ti and Ti alloys are known to have excellent corrosion properties, which is an important aspect for biocompability of these implants in human body. In our study, four types of samples (Cp-Ti, Ti-6Al-4V, <TEX>$0.5wt.\%$</TEX> Fe-Ti and ECAP Ti) were tested for their apatite forming ability and corrosion properties. The micropolished samples were treated with 5M NaOH solution at <TEX>$60^{\circ}C$</TEX> for 24 hours. Each samples was gently washed with distilled water and heat-treated at 600"C for 1 hour. The heat-treated samples were soaked in Simulated Body Fluid (SBF) solution at <TEX>$36.5^{\circ}C$</TEX> in an incubator for different period of time. The test revealed that <TEX>$0.5 wt.\%$</TEX> Fe-Ti showing faster apatite growth on the surface (7th day) compared to other samples. Polarization curve test (PCT) was also carried out to determine the corrosion resistance of each samples in SBF solution. ECAP-Ti showed highest corrosion resistance compared to any other samples. <TEX>$0.5wt.\%Fe-Ti$</TEX> showed higher corrosion potential and corrosion current compared to other samples.