Three coatings (Al-Si coating

Al coating and Co-Al coating) were prepared on the surface of nickel-based superalloy DSM11. The hot corrosion behaviors in the salt of 5%NaCl+95%Na2SO4 (mass fraction) at 900℃ and the fatigue property at 800℃ were investigated. The coatings after corrosion for 200h at 900℃

Al-Si and Co-Al coatings had excellent hot corrosion resistance to further hot corrosion because of a continuous and dense Al2O3 protective layer on the surface. Al coating had poorer hot corrosion resistance for a mixed oxidation layer in the corrosion area

which could not prevent hot corrosion. After fatigue test of the coatings at 800℃

the alloy samples were prone to rapid fracture that a lot of micro cracks appeared on the surface of Al coating. Co-Al and Al coatings showed better high-temperature fatigue performance. In order to select the most suitable protective coating of nickel-based superalloy

service environment and integrated performance should be fully considered.