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

N. Israelsson; K. A. Unocic; K. Hellström; T. Jonsson; M. Norell; J. E. Svensson; L. G. Johansson

doi:10.1007/s11085-015-9546-3

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

N. Israelsson, K. A. Unocic, K. Hellström, T. Jonsson, M. Norell, J. E. Svensson, L. G. Johansson

Materials MicroAnalysis

Research output: Contribution to journal › Article › peer-review

52 Scopus citations

Abstract

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. 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.

Original language	English
Pages (from-to)	105-127
Number of pages	23
Journal	Oxidation of Metals
Volume	84
Issue number	1-2
DOIs	https://doi.org/10.1007/s11085-015-9546-3
State	Published - Aug 1 2015

Funding

The Microscopy 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 TEM sample preparations.

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

Keywords

FeCrAl
High-temperature corrosion
KCl
Water vapour

Access to Document

10.1007/s11085-015-9546-3

Cite this

@article{6156d6c810a84409ba24090f0d4e83cc,

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

abstract = "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. 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.",

keywords = "FeCrAl, High-temperature corrosion, KCl, Water vapour",

author = "N. Israelsson and Unocic, {K. A.} and K. Hellstr{\"o}m and T. Jonsson and M. Norell and Svensson, {J. E.} and Johansson, {L. G.}",

note = "Publisher Copyright: {\textcopyright} 2015, The Author(s).",

year = "2015",

month = aug,

day = "1",

doi = "10.1007/s11085-015-9546-3",

language = "English",

volume = "84",

pages = "105--127",

journal = "Oxidation of Metals",

issn = "0030-770X",

number = "1-2",

}

TY - JOUR

T1 - A Microstructural and Kinetic Investigation of the KCl-Induced Corrosion of an FeCrAl Alloy at 600 °C

AU - Israelsson, N.

AU - Unocic, K. A.

AU - Hellström, K.

AU - Jonsson, T.

AU - Norell, M.

AU - Svensson, J. E.

AU - Johansson, L. G.

PY - 2015/8/1

Y1 - 2015/8/1

N2 - 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. 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.

AB - 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. 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.

KW - FeCrAl

KW - High-temperature corrosion

KW - KCl

KW - Water vapour

UR - http://www.scopus.com/inward/record.url?scp=84946471023&partnerID=8YFLogxK

U2 - 10.1007/s11085-015-9546-3

DO - 10.1007/s11085-015-9546-3

M3 - Article

AN - SCOPUS:84946471023

SN - 0030-770X

VL - 84

SP - 105

EP - 127

JO - Oxidation of Metals

JF - Oxidation of Metals

IS - 1-2

ER -