A Microstructural and Kinetic Investigation of the KCl-Induced Corrosion of an FeCrAl Alloy at 600 °C

Israelsson, Niklas; Unocic, Kinga A.; Hellström, K.; Jonsson, T.; Norell, M.; Svensson, J. -E.; Johansson, L. -G.

doi:10.1007/s11085-015-9546-3

Title: A Microstructural and Kinetic Investigation of the KCl-Induced Corrosion of an FeCrAl Alloy at 600 °C

Journal Article · Wed Mar 18 00:00:00 EDT 2015 · Oxidation of Metals

DOI:https://doi.org/10.1007/s11085-015-9546-3· OSTI ID:1286716

Israelsson, Niklas ^[1]; Unocic, Kinga A. ^[2]; Hellström, K. ^[1]; Jonsson, T. ^[1]; Norell, M. ^[3]; Svensson, J. -E. ^[1]; Johansson, L. -G. ^[1]

Chalmers Univ. of Technology, Gothenburg (Sweden). The Swedish Competence Centre for High Temperature Corrosion
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
Chalmers Univ. of Technology, Gothenburg (Sweden). Dept. of Materials and Manufacturing Technology

In this paper, the corrosion behaviour of a FeCrAl alloy was investigated at 600 °C in O₂ + H₂O with solid KCl applied. A kinetics and microstructural investigation showed that KCl accelerates corrosion and that potassium chromate formation depletes the protective scale in Cr, thus triggering the formation of a fast-growing iron-rich scale. Iron oxide was found to grow both inward and outward, on either side of the initial oxide. A chromia layer is formed with time underneath the iron oxide. Finally, it was found that although the alloy does not form a continuous pure alumina scale at the investigated temperature, aluminium is, however, always enriched at the oxide/alloy interface.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1286716

Journal Information:: Oxidation of Metals, Vol. 84, Issue 1; ISSN 0030-770X

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 42 works

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Field exposure of FeCrAl model alloys in a waste‐fired boiler at 600°C: The influence of Cr and Si on the corrosion behaviour Eklund, Johan; Paz, Maria Dolores; Jönsson, Bo Materials and Corrosion, Vol. 70, Issue 8 https://doi.org/10.1002/maco.201810618	journal	April 2019
Laser Clad and HVOF-Sprayed Stellite 6 Coating in Chlorine-Rich Environment with KCl at 700 °C Pala, Zdenek; Bai, Mingwen; Lukac, Frantisek Oxidation of Metals, Vol. 88, Issue 5-6 https://doi.org/10.1007/s11085-017-9776-7	journal	April 2017

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36 MATERIALS SCIENCE
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Title: A Microstructural and Kinetic Investigation of the KCl-Induced Corrosion of an FeCrAl Alloy at 600 °C

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