Sulfidation kinetics of titanium and Ti-6Al-4V with elemental sulfur

Abstract

The sulfidation kinetics of titanium and Ti-6Al-4V (Ti64) using elemental sulfur were studied by measuring the amount of metal consumed instead of the change in mass or scale thickness. This metal consumption approach combines the parabolic oxidation law, Arrhenius equation, and Pilling-Bedworth ratio to determine the apparent activation energy and the pre-exponential factor of consumption of Ti64 during sulfidation. The estimations of apparent activation energy and preexponential factor were 110.4 kJ•mol −1 and 1.3 × 10 −9 m 2 s −1 for the titanium-sulfur, and 116.2 kJ•mol −1 and 1.2 × 10 −9 m 2 s −1 for the Ti64-sulfur system. Finally, a material removal predictor was developed to predict the amount of Ti64 consumed for a given sulfidation temperature and time.