Effect of Sn addition on the corrosion behavior of Ti-Ta alloy

In the present paper, the effect of Sn addition on phase constitution and corrosion behavior of Ti65Ta(35-x)Snx (x=0, 1, 3, 5at%) alloys has been investigated using X-ray diffraction and electrochemical measurements. The results show that the beta phase is stabilized when quenching after the addition of Sn into Ti65Ta35 alloy, with Ti65Ta30Sn5 alloy consisting of single beta phase at room temperature. The corrosion resistance is enhanced with increase in the Sn content. When the Sn content increases up to 5%, the addition of Sn results in a decrease of corrosion current density from 0.690 mu A/cm2 of the Ti65Ta35 alloy to 0.098 mu A/cm2, and corresponding passive current density decreased from 37.7 mu A/cm2 of the Ti65Ta35 alloy to 9.30 mu A/cm2.