Role of tantalum in the hot corrosion of a Ni-base single crystal superalloy

Hot corrosion behaviour of a Ni-base single crystal superalloy with low Cr, Ti and high Ta contents in molten sodium sulphate (Na2SO4) at 900 °C in static air was investigated using the “deposit recoat” method. The corrosion scale was composed of an outer NiO layer, an inner Al2O3-dominant oxide network layer and a (CrSx(1.000