The effect of Cl, Br, and F on high-temperature corrosion of heat-transfer alloys

Thumbnail Image
Access rights
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Degree programme
Fuel, Volume 348
The impact of small alkali halide additions on the melting behavior and corrosivity of a synthetic sulfate deposit at 500, 550, and 600 °C was investigated. Three differently alloyed commercial heat-transfer materials; low-alloyed 10CrMo9-10, stainless AISI 347, and high-alloyed Sanicro 28, were studied. The samples were exposed for 168 h in a tube furnace to a K2SO4 + Na2SO4 mixture containing 0.85 mol% KCl, KBr, or KF. The extent of material degradation was determined by weight loss measurements, while the morphology, thickness, and composition of the formed oxide scale were characterized with SEM-EDS. Additionally, the melting behavior of the mixtures was studied with TG-DTA. It could be concluded that already small amounts of reactive alkali halides in an otherwise inert K2SO4 + Na2SO4 mixture change significantly the corrosion and melting behavior of the mixture.
Funding Information: This work was conducted within the Academy of Finland project “Initiation and propagation of high-temperature corrosion reactions in complex oxygen-containing environments” (Decision no. 348963). This work was partly supported by the project Clean and efficient utilization of demanding fuels (CLUE 2 ), with support from the industrial partners: ANDRITZ Oy, Valmet Technologies Oy, UPM-Kymmene Oyj, Metsä Fibre Oy, and International Paper Inc., as part of the activities of the Åbo Akademi University Johan Gadolin Process Chemistry Centre. Publisher Copyright: © 2023 The Author(s)
Alkali halides, Heat-transfer materials, High-temperature corrosion, Melt formation, Waste combustion
Other note
Eriksson , J E , Lehmusto , J , Dirbeba , M , Silvander , L , Lindberg , D & Hupa , L 2023 , ' The effect of Cl, Br, and F on high-temperature corrosion of heat-transfer alloys ' , Fuel , vol. 348 , 128516 .