Electrochemical characterization of the superelastic (Ti‐Zr)‐Mo‐Sn biomedical alloy displaying a large recovery strain

In this work, the new (Ti‐Zr)‐1.5Mo‐3Sn biomedical alloy showing a large superelastic recovery strain of 7% and Young's modulus of 60 GPa was characterized and compared with CP Ti and Ti‐6Al‐4V alloys currently used in medicine. The microstructure of the new (Ti‐Zr)‐1.5Mo‐3Sn alloy consists of single β phase (XRD and optical microscopy results). The new alloy has a relatively thick (7.0 nm) native passive film mainly formed by protective TiO2, ZrO2, MoO2, and SnO2 oxides (XPS data). The electrochemical parameters for the new alloy have more favorable values than those of CP Ti, and Ti‐6A‐4V alloy, namely a nobler electrochemical behavior. The corrosion current density and rate of the (Ti‐Zr)‐1.5Mo‐3Sn alloy are about 7 times lower and the polarization resistance is about 5 times higher than those obtained for the comparing metallic biomedical materials. Electrochemical impedance spectra proved that the new alloy presents the most insulating and protective passive film out of the three studied materials. The new (Ti‐Zr)‐1.5Mo‐3Sn biomedical alloy showing large superelastic recovery strain of 7% and Young's modulus of 60 GPa was characterized and compared with CP Ti and Ti‐6Al‐4V alloys currently used in medicine.