Abstract
Ti-6.5Al-3.4Mo-1.7Zr was cast as rods in a graphite mold using vacuum induction furnace. The cast rods were hot swaged then heat treated by using two regimes which resulted in fine and coarse lamella structures. The influence of these different structures on the corrosion behavior of α+β Ti-alloy samples was investigated. Potentiodynamic polarization in 3.5%NaCl solution showed that the swaged condition exhibited the highest corrosion resistance compared to the others. After isothermal oxidation for different times (2, 4, 8 and 16h), maximum weight gain was obtained after 8 h and the corrosion resistance of the swaged material was significantly higher than the other conditions. Thereby, isothermal oxidation enhanced markedly the corrosion resistance of the studied Ti-alloy. Among various conditions of the isothermally oxidized samples, the as-cast condition showed the highest value of pitting potential.