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The service lives of nickel superalloys are often limited by environmentaldegradation. The present study compares oxidation, sulfidation and hotcorrosion at 750C of three variants of a polycrystalline superalloy: a baselinealloy, a variant containing 1wt% Mn and one containing 0.5wt% Si. Mn reducedthe oxidation rate without changing the scale morphology. The MnCr2O4 scaleformed proved more protective against sulfidation and hot corrosion, butinternal sulfides extended the damage depth. Si modified the oxide morphologyto a continuous Cr2O3-Al2O3 dual layer. This provided improved protection,reducing the sulfidation depth by 2/3 and the hot corrosion depth by 1/2.

The effect of manganese and silicon additions on the corrosion resistance of a polycrystalline nickel-based superalloy