Some aspects of the performance of rare earth modified nickel‐base alloys in hot corrosion conditions

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Abstract
Rare earth additions have shown improvements to corrosion behaviour of nickel and cobalt base superalloys in simulated fuel combustion corrosion situations. “Hot corrosion”tests, at various levels of severity, have been conducted on nickel‐base alloys in the range of 870 to 1200°C with sulfur supplied from molten sodium sulfate or from low concentrations of sulfur dioxide in argon (0.2% SO2). The results show, that rare earth as oxide is essential for corrosion resistance in sulfurous environments.