Abstract
A Ni-20Cr alloy has been reacted in SO 2 at 600–900°C. Reaction kinetics have been studied as a function of temperature, pressure and experimental procedure. Reaction products have been characterized by X-ray diffraction, scanning electron microscopy, and differential thermal analyses. Depending upon the reaction conditions, the primary reaction products are NiO and Ni 3S 2, and Cr 2O 3 and (Ni-S) hq. Under conditions where Ni 3S 2 is formed, reactions are rapid, while the formation of (NiS) liq (>800°C) leads to slow reactions. The molten sulfide phase facilitates transport of chromium to the scale-gas interface where a protective layer of Cr 2O 3 is formed. Reaction mechanisms are discussed in terms of thermodynamic stability of the reaction products.
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