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

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.

Description

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)

Keywords

Alkali halides, Heat-transfer materials, High-temperature corrosion, Melt formation, Waste combustion

DOI

10.1016/j.fuel.2023.128516

Citation

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 . https://doi.org/10.1016/j.fuel.2023.128516

Permanent link to this item

https://urn.fi/URN:NBN:fi:aalto-202305103038

Collections

[article-cris] Kemian tekniikan korkeakoulu / CHEM

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