Cyclic Corrosion and Chlorination of an FeCrAl Alloy in the Presence of KCl

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

doi:10.1007/s11085-015-9554-3

Cyclic Corrosion and Chlorination of an FeCrAl Alloy in the Presence of KCl

Journal Article · Sat May 30 00:00:00 EDT 2015 · Oxidation of Metals

DOI:https://doi.org/10.1007/s11085-015-9554-3· OSTI ID:1265764

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

Chalmers Univ. of Tech., Goteborg (Sweden)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

The KCl-induced corrosion of the FeCrAl alloy Kanthal® APMT in an O² + N² + H₂O environment was studied at 600 °C. The samples were pre-oxidized prior to exposure in order to investigate the protective nature of alumina scales in the present environment. The microstructure and composition of the corroded surface was investigated in detail. Corrosion started at flaws in the pre-formed α-alumina scales, i.e. α-alumina was protective in itself. Consequently, KCl-induced corrosion started locally and, subsequently, spread laterally. An electrochemical mechanism is proposed here by which a transition metal chloride forms in the alloy and K₂CrO₄ forms at the scale/gas interface. Scale de-cohesion is attributed to the formation of a sub-scale transition metal chloride.

View Accepted Manuscript (DOE)

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)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1265764

Journal Information:: Oxidation of Metals, Journal Name: Oxidation of Metals Journal Issue: 3-4 Vol. 84; ISSN 0030-770X

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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