Résumé
This paper reports on the hot corrosion behavior of the nickel-based single crystal superalloyTROPEA exposed to a deposit of Na2SO4in air and in SO2-containing atmospheres at 700 °Cand 900 °C for 24 hours. In the absence of SO2, TROPEA simply oxidizes at 700 °C despite theNa2SO4deposit but the latter induces basic fluxing of protective oxides at 900 °C by developingNaTaO3and Na2CrO4phases. Yet, no specific role of Pt is found. In the presence of SO2,Ptisshown to enhance hot corrosion at low temperatures through a potential catalytic effect.However, Pt doe s not seem to exert any specific role at high temperature under the same gasatmosphere. Instead, Cr and Ta develop sulfides that foster the ingress of S into the material.Overall, TROPEA seems to behave similar to other SX sup eralloys except at low temperaturewhere Pt appears to be particularly detrimental.