Abstract
Sulfur segregation to the free metal surface of a Ni-20(wt.%)Cr-12(wt.%)Al alloy has been documented by high-temperature scanning Auger electron microscopy. Preferential enrichment of sulfur occurs to the surface of the chromium-rich γ phase in the two-phase y nickel-β (NiAl) alloy. Electron spectroscopy for chemical analysis (ESCA) studies have indicated that for a free metal surface, i.e., metal without an overlying thermally grown oxide scale, the surface segregated sulfur correlated with both S−2 and elemental sulfur. Energy-dispersive X-ray analysis (EDAX) characterization of fractured oxide films thermally grown on the Ni-Cr-Al alloy indicated that both a labile, i.e., relatively volatile, and a refractory sulfur species exist at the scale-metal interface. Elemental sulfur as detected by ESCA has the volatility characteristics found for the labile sulfur species found in the scanning electron microscopy (SEM)-EDAX studies.
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Smeggil, J.G., Peterson, G.G. Nature of indigenous sulfur segregated to the free metal surface and to the scale-metal interface. Oxid Met 29, 103–119 (1988). https://doi.org/10.1007/BF00656351
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DOI: https://doi.org/10.1007/BF00656351