Degradation mechanism of Ti-6Al-2Sn-4Zr-2Mo-Si alloy exposed to solid NaCl deposit at high temperature

•NaCl deposit strongly increases the corrosion rate of Ti-6Al-2Sn-4Zr-2Mo-Si alloy.•An active oxidation mechanism involving metal chlorides is thought to be responsible for the material degradation.•Role of the alloying elements is related to the active oxidation mechanism.•New insights on the nature of the internal oxidation area that forms in presence of NaCl.