The corrosion behavior of the HVOF-sprayed NiCoCrAlYTa coating upon exposure to molten V₂O₅ and molten mixture of 50 wt.% V₂O₅ + 50 wt.% Na₂SO₄ at 800–1000 °C was discussed. The hardness, elastic modulus and contact stiffness of the coating were determined by nano-indentation test. Results indicate that the coating exhibits good corrosion resistance, which is ascribed to the formation of Al and Cr oxide protective film. The generation of hard phases Al₂O₃ and Cr₂O₃ with loose structure and Laves phase Cr₂Ta lead to the increase of the hardness and elastic modulus of the corroded coatings and the decrease of contact stiffness.