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High-Temperature Corrosion by Sulfidation

The major constituent in flue-gas corrosion that differentiates it from common high-temperature atmospheric corrosion is the sulfur content. In general, oxidation by sulfur, or sulfidation, is a considerably more destructive form of high-temperature corrosion than oxidation by oxygen. Sulfide scales tend to crack and spall more readily than oxides, which can remain continuous and provide some degree of corrosion protection. In some cases, depending on the form in which sulfur is present in the atmosphere, continuous sulfide scales cannot form, so attack will proceed linearly; that is, the scale will afford no protection. The melting points of metallic sulfides usually are lower than those of the corresponding oxides.

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