Abstract
The Ti-48Al-2Nb-0.7Cr-0.3Si alloy comprising of α2-Ti3Al and γ-TiAl phases was successfully fabricated using vacuum arc melting. To study its hot corrosion behaviour, the alloy was subjected to cyclic thermal loading under a Na2SO4 + 25wt.%NaCl molten salt mixture at 900 °C for up to 60 h. Mass change per unit surface was measured to determine the corrosion kinetics of the alloy. The alloy experienced severe hot corrosion attacks up to -50.94 mg/cm2. SEM indicated the formation of a mixture of TiO2/Al2O3 scales on the alloy's surface. XRD confirmed the presence of hot corrosion products such as Na2Ti3O7, TiO2, Al2O3, and Cr2O3. The presence of chlorine gas in the hot corrosion environment resulted in the delamination of the protective scale on the surface, indicating its detrimental effect.
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