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MM: Fachverband Metall- und Materialphysik
MM 18: Poster Session I
MM 18.30: Poster
Montag, 16. März 2020, 18:15–20:00, P4
Calorimetric Study of Low Melting Eutectics in Chlorine-induced High Temperature Corrosion Environment — •Sophie Winkler, Sebastian Pentz, and Ferdinand Haider — Chair of Experimental Physics I, University of Augsburg, 86135 Augsburg
Waste incineration power plants provide an energetic usage of the produced heat by thermal composition. Complex systems in the exhaust stream are used for the heat extraction at prevalent temperatures of 400–600 ∘C. These steel pipes are exposed to the flue gas and therefore subject to a high degree of corrosion. The main damage is caused by the chlorine induced high temperature corrosion. Sulfation reactions of the sulfur dioxide with solid alkali chlorides in the flue steam occur which results in a release of chlorine or chlorine compounds in close proximity of the metallic components like superheaters or boiler walls. The released Cl2 or HCl attack the iron under formation of FeCl2 or FeCl3 leading to a massive removal of the steel material.
The resulting deposits of the steel pipes are then subjected to different methods of thermal and elemental analysis to determine the composition and chemical reactions happening in the corrosion process. Using Differential Scanning Calorimetry, it is possible to construct the phase diagrams of the participating sulfates (CaSO4, K2SO4, Na2SO4) and to analyse the occurring low melting eutectics that accelerate the corrosion process.