Every concrete and steel structure in a sulphuric acid plant is constantly being exposed to immensely corrosive stresses. To assure the safety required for plant and production, the use of corrosion protection materials is imperative. Besides the huge chemical stresses caused by the effects of sulphuric acid, the action of which increases at high temperatures, some over 1000°C, and/or during temperature fluctuations, the focus also has to be on mechanical stresses in the form of high pressures or even abrasive influences. To protect structural components from corrosion, however, both acid-resistant, i.e. chemically resistant, materials and high-temperature resistant materials, so-called refractory materials, have been in use for a long time now. When work is being done during the shutdown of a sulphuric acid plant, the wide variety of areas in use and the problems encountered there should first be indicated. Then the various corrosion protection alternatives should be compared in their different behaviours.
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