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

N. Israelsson; K. A. Unocic; K. Hellström; J. E. Svensson; L. G. Johansson

doi:10.1007/s11085-015-9554-3

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

N. Israelsson, K. A. Unocic, K. Hellström, J. E. Svensson, L. G. Johansson

Materials MicroAnalysis

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24 Scopus citations

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.

Original language	English
Pages (from-to)	269-290
Number of pages	22
Journal	Oxidation of Metals
Volume	84
Issue number	3-4
DOIs	https://doi.org/10.1007/s11085-015-9554-3
State	Published - Oct 10 2015

Funding

TEM research was supported by the Center for Nanophase Materials Sciences (CNMS), which is sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. The authors would like to thank D.W. Coffey for assistance with sample preparations.

Funders	Funder number
Center for Nanophase Materials Sciences
Scientific User Facilities Division
U.S. Department of Energy
Basic Energy Sciences

Keywords

FeCrAl
High temperature corrosion
KCl
Pre-oxidation
Water vapour

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10.1007/s11085-015-9554-3

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title = "Cyclic Corrosion and Chlorination of an FeCrAl Alloy in the Presence of KCl",

abstract = "The KCl-induced corrosion of the FeCrAl alloy Kanthal{\textregistered} 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.",

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AU - Israelsson, N.

AU - Unocic, K. A.

AU - Hellström, K.

AU - Svensson, J. E.

AU - Johansson, L. G.

PY - 2015/10/10

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N2 - 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.

AB - 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.

KW - FeCrAl

KW - High temperature corrosion

KW - KCl

KW - Pre-oxidation

KW - Water vapour

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ER -

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

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Keywords

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