Corrosion Behaviour of TiAl, Ti3Al and TiAl3 Intermetallics in Alkaline H2O2 Solution

Electrochemical and corrosion behavior of Ti-Al stable intermetallics (TiAl, Ti3Al and TiAl3) in H2O2 solution at different concentrations with constant pH of 12.5 was studied in this paper. As-casted alloys were fabricated under vacuum arc remelting (VAR) process. Then the samples were examined in H2O2 solution using different electrochemical analysis containing potential-time, potentiodynamic polarization and electrochemical impedance. The results showed that the concentration of the electrolyte had a considerable effect on the corrosion of the specimens. At higher concentrations an inductive element was also observed in the EIS curves. Anodic polarization behavior of titanium aluminide specimens in H2O2 was relatively similar, all showing passivity. However, the passive current density increased by increasing Al content in the intermetallic.