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The short-term reaction of Ni–36Al (at. %) and Ni–36Al–5Cr alloys with Na2SO4 in O2-0.1% SO2 at 700°C was studied by SEM and TEM. Local failure of the protective scale on NiAl led to nodule development via internal oxidation. Conversely, NiAlCr underwent a uniform attack involving internal sulfidation, porous scale growth, and NiO and Al2O3 dissolution into the sulfate. The roles of gas and sulfate...
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