Electrochemical corrosion of novel beta titanium alloys

Electrochemical corrosion behaviors of novel beta titanium alloys, Ti-30Ta-10Nb-10Zr,T1-40Ta-10Nb-10Zr and Ti40Ta-10Nb-4Sn were characterized in naturally aerated Hank's solution at 37 degrees C compared with currently used biomedical titanium alloys. Ti-30Ta-10Nb-10Zr and Ti-40Ta-10Nb-Zr exhibited comparable corrosion resistance to CP Ti or Ti-6A1-4V, while the corrosion resistance of Ti-40Ta-10Nb-4Sn was greatly inferior to the other alloys. An EIS data analysis confirmed that the resistance of passive film for Ti-30Ta-10Nb-10Zr and Ti-40Ta-10Nb-10Zr was comparable to CP Ti or Ti-6A1-4V. Ti-30Ta-10Nb-10Zr and Ti-40Ta-10Nb-10Zr alloys are promising metallic biomaterials for the future, owing to their very low elastic modulus and good corrosion resistance capabilities.