Abstract
The effect of Zr partially replacing Pt on the hot corrosion resistance of β-(Ni, Pt)Al coating at 900 ℃ has been studied due to the high cost of Pt. The Zr replacing Pt coatings with substitutions up to 17 at% and 24 at% show remarkably better hot corrosion resistance than pure (Ni, Pt)Al coating. Zr ions segregation at the oxide grain boundaries reduces the oxidation rate and Zr inhibits the development of Al2O3 intrusions through the fixation effect of Zr on S. However, the growth of ZrO2 particles in the oxide scale induced by over-doping leads to local scale spallation.
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