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Abstract
A series of Fe-Ni-Cr, Fe-Cr-AI, and Fe-Ni-Cr-Al alloys has been exposed at 1200 °C in atmospheres of controlled oxygen and sulfur potentials, after preoxidation in air or in impure argon. The corrosion behavior has been interpreted on the basis of phase-stability diagrams. The presence of iron and nickel-rich spinel particles in the outer layers of the initial oxide scales plays an essential role in the resistance to sulfur attack. When the oxygen potential is sufficiently low, these spinels are reduced to a mixture of chromium oxide and an Fe-Ni alloy. The latter can then form sulfides which are liquid at high temperatures and which accelerate the penetration of sulfur into the underlying metal.
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