Hot Corrosion on NiCrFeNbMoTiAl Coating for Aeronautical Applications

The Application of coatings on turbine blades looking for reduces corrosion due to molten salts is relevant. Molten salts of Na₂SO_4, V₂O₅ and K₂SO₄ were deposited by non-transfer arc plasma-assisted thermal spraying (APS) at a temperature of 700°C. Corrosion rate was determinate by electrochemical techniques as linear polarization resistance and electrochemical impedance spectroscopy (EIS). The results showed that the coating deposited by APS was attacked by molten salts of V₂O₅ and Na₂SO₄ more than V₂O₅ and K₂SO_4.