[Article] - Investigation of the hot corrosion of a superalloy for improved durability of aeronautical engines.
Type-II hot corrosion behavior was investigated on the Ni-based superalloys DS200+Hf, precoated with Na2SO4, in a flowing O2–SO2–SO3 atmosphere. Corrosion products were characterized as an outer oxide layer rich in Ni and Co, and a complex inner layer including S and O. Investigations at the nanoscale of the propagation front revealed the formation of a partially crystallized WS2 network, ordered along the c-axis with the γ/γ’ microstructure. Statistical measurement of the affected depths showed that the corrosion rate followed a parabolic law as a function of time from 550 °C to 700 °C.
Autors
G. Dufour, D. Texier, T. Sanviemvongsak, T. Perez, S. Knittel, J. Bonnal, J. Ghanbaja, M. Emo, S. Migot, M. Vilasi, S. Mathieu
References
Corrosion Science 255 (2025) 113095
