Abstract
The kinetics, phase composition, and morphology of scales growing on chromium in SO2 atmospheres were studied over the temperature range 1073–1273 K and SO2pressures of 3×104 Pa and 105 Pa. It was found that the scales consist mainly of Cr2O3, with only small amounts of sulfur (probably CrS) detected next to the metallic substrate. Oxidation proceeds according to the linear rate law at 105 Pa SO2 whereas at 1173 and 1273 K at 3×104 Pa SO2 the parabolic rate law is followed. The transport phenomena were studied by means of radiotracer techniques as well as marker techniques. The oxide–sulfide scales grew mainly by outward diffusion of metal; however, inward transport of S2 or SO2 molecules was also observed. The mechanisms of sulfide and oxide formation are discussed on the basis of the experimental results.
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