Abstract
Corrosion of high-temperature alloys has been a problem in power plants. Ash and salts are deposited on the surface of boiler tubes in certain temperature ranges and cause accelerated corrosion of the material. Rapid corrosion is often associated with the presence of molten salts on the surface. Although spectrochemical analysis shows a number of chemical elements in the accumulated deposits, the corrosion problem is concerned mainly with the sulphates of sodium and potassium. Under suitable conditions the sulphates of these alkali metals absorb SO3, forming pyrosulphates according to
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