Hot corrosion behavior of FGH96 powder metallurgy (P/M) superalloy in 25 ％ NaCl + 75 ％ Na2SO4 molten salts at 650,700,and 750 ℃ was investigated in this paper.The methods of mass loss measurement,X-ray diffraction (XRD),scanning electron microscopy (SEM),and energy-dispersive spectroscopy (EDS) were used here.The experimental results show that hot corrosion kinetics follows a square power law at 650 ℃,while a linear one at 700 and 750 ℃.The corrosion layer is detected to be composed of Cr2O3,NiO,and Ni2S3 at each temperature.The cross-sectional morphologies and corresponding elemental maps indicate that the corrosion layer is a stratified structure of oxide and sulfide.The results and analyses confirm that the hot corrosion mechanism of FGH96 P/M superalloy is a cooperate process of oxidation and sulfidation.Furthermore,the relatively higher concentrations of Cr,Co,and Ti provide better corrosion resistance to the attack of S and Cl-.