Improved oxidation and hot corrosion resistance of Ta‐doped NiAlY alloy at 750°C

Abstract

AbstractThe oxidation and hot corrosion behaviors of the NiCrAlY, NiAlY, and Ni–xTa–Al–Y alloys (x = 1, 3, 5, and 10 wt%) were investigated at 750°C. The doped Ta promoted the formation of the protective α‐Al2O3 scales. The NiTaAlY alloys exhibited an improved oxidation resistance compared with the NiAlY alloy. Under the NaCl‐induced hot corrosion test, the addition of Ta reduced the consumption of Al and inhibited the internal corrosion of the alloys. The Ni–xTa–Al–Y alloys (x = 1, 3, 5, and 10 wt%) showed better resistance to the NaCl‐induced hot corrosion. Moreover, the hot corrosion mechanism of the tested alloys was also discussed.