Mechanism of low temperature hot corrosion: Burner rig studies☆

Abstract The unexpectedly rapid corrosion induced by Na 2 SO 4 , which has been observed in recent years on gas turbine components operating in the range 600–730°C, has been studied in burner rig tests. The microstructural features and kinetics of this mode of attack are shown to occur on nickel or cobalt base superalloys and coatings only when the gaseous environment contains sufficient SO 3 to form a liquid eutectic between Na 2 SO 4 and CoSO 4 .