Abstract
This chapter presents that Metal Dusting (MD) is a high-temperature corrosion process, a disintegration of metals into a dust of fine metal particles and graphite, which occurs in strongly carburizing atmospheres at carbon activities a C >> 1 in the temperature range 400–1000 °C. Metal dusting attacks iron, low- and high-alloy steels, nickel, and cobalt-based alloys. In the case of iron and steels, during metal dusting, cementite (Fe 3 C) forms as an intermediate phase, which decomposes into graphite and iron, whereas nickel disintegrates by direct inward growth of graphite. The chapter provides an overview of the effect of H 2 S on metal dusting of iron. It further discusses effect of H 2 S on carburization kinetics and graphite formation, carbon diffusion in cementite and Hägg carbide (Fe 5 C 2 ), thermodynamics of Hägg carbide formation, decomposition of Fe 3 C and Fe 5 C 2 , iron sulfide formation in atmospheres containing H 2 S and practical aspects of sulfur adsorption.
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