Cyclic Corrosion and Chlorination of an FeCrAl Alloy in the Presence of KCl
Abstract
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.
- Authors:
-
- Chalmers Univ. of Tech., Goteborg (Sweden)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1265764
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Oxidation of Metals
- Additional Journal Information:
- Journal Volume: 84; Journal Issue: 3-4; Journal ID: ISSN 0030-770X
- Publisher:
- Springer
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; FeCrAl; Pre-oxidation; High temperature corrosion; Water vapour; KCl
Citation Formats
Israelsson, Niklas, Unocic, Kinga A., Hellström, K., Svensson, J-E, and Johansson, L-G. Cyclic Corrosion and Chlorination of an FeCrAl Alloy in the Presence of KCl. United States: N. p., 2015.
Web. doi:10.1007/s11085-015-9554-3.
Israelsson, Niklas, Unocic, Kinga A., Hellström, K., Svensson, J-E, & Johansson, L-G. Cyclic Corrosion and Chlorination of an FeCrAl Alloy in the Presence of KCl. United States. https://doi.org/10.1007/s11085-015-9554-3
Israelsson, Niklas, Unocic, Kinga A., Hellström, K., Svensson, J-E, and Johansson, L-G. Sat .
"Cyclic Corrosion and Chlorination of an FeCrAl Alloy in the Presence of KCl". United States. https://doi.org/10.1007/s11085-015-9554-3. https://www.osti.gov/servlets/purl/1265764.
@article{osti_1265764,
title = {Cyclic Corrosion and Chlorination of an FeCrAl Alloy in the Presence of KCl},
author = {Israelsson, Niklas and Unocic, Kinga A. and Hellström, K. and Svensson, J-E and Johansson, L-G},
abstractNote = {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.},
doi = {10.1007/s11085-015-9554-3},
journal = {Oxidation of Metals},
number = 3-4,
volume = 84,
place = {United States},
year = {Sat May 30 00:00:00 EDT 2015},
month = {Sat May 30 00:00:00 EDT 2015}
}
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Works referencing / citing this record:
Corrosion of welds in biomass power plants
journal, October 2018
- Montgomery, Melanie; Dahl, Kristian V.; Hald, John
- Materials and Corrosion, Vol. 70, Issue 4