Corrosion resistant Ti alloy for sulphuric acid medium: Suitability of Ti–Mo alloys

Abstract

The corrosion resistance of Ti–Mo (5, 10, 15 and 25wt% molybdenum) alloys in 5–25% sulphuric acid was evaluated.The Ti–Mo alloys offered a better corrosion resistance than commercially pure titanium (CP-Ti). The higher impedance values, higher phase angle maximum, ability to reach the phase angle maximum at relatively lower frequencies, ability to exhibit a constant phase angle maximum over a wider range of frequencies, higher phase angle values at 0.01 Hz, have confirmed the formation of a stable passive oxide film on Ti–Mo alloys. The study recommends the use of Ti–Mo alloys, particularly Ti–25Mo alloy, as a suitable material of construction for sulphuric acid medium.