Laboratory studies of potassium-halide-induced high-temperature corrosion of superheater steels. Part 1: Exposures in dry air

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In recent years, some concerns about halogen (Cl, Br, and F)-related high-temp. corrosion in biomass- or waste-fired boilers have been raised. The presence of alkali chlorides in the deposits is believed to play a major role in high-temp. corrosion of the superheater steel materials in biomass- or waste-fired boilers. Available data are very scarce regarding alkali-bromide- or -fluoride-induced corrosion. This work has carried out using lab-scale high-temp. corrosion tests with three different superheater tube materials (10CrMo9-10, AISI 347, and Sanicro 28) exposed to KBr or KF at different temps. (400-600 °C). At relatively low temps. (≤550 °C), KBr and KF showed corrosivity similar to that of KCl. At 600 °C, KF showed much stronger corrosivity than either KBr or KCl, esp. in the cases with the low-alloy steel 10CrMo9-10 and the austenitic steel AISI 347. At 550 °C and above, the oxide layers formed on the three steels were generally thicker and more uneven when exposed to KF compared to the results of the tests with KBr.
Original languageUndefined/Unknown
Pages (from-to)1186–1195
JournalEnergy and Fuels
Issue number2
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed

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