Complementary Methods for the Characterization of Corrosion Products on a Plant-Exposed Superheater Tube

Sunday Chukwudi Okoro; Frank Nießen; Matteo Villa; Daniel Apel; Melanie Montgomery; Flemming Jappe Frandsen; Karen Pantleon

doi:10.1007/s13632-016-0325-6

Complementary Methods for the Characterization of Corrosion Products on a Plant-Exposed Superheater Tube

Sunday Chukwudi Okoro, Frank Nießen, Matteo Villa, Daniel Apel, Melanie Montgomery, Flemming Jappe Frandsen, Karen Pantleon

Research output: Contribution to journal › Journal article › Research › peer-review

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Abstract

In this work, complex corrosion products on a superheater tube exposed to biomass firing were characterized by the complementary use of energy-dispersive synchrotron diffraction, electron microscopy, and energy-dispersive X-ray spectroscopy. Non-destructive synchrotron diffraction in transmission geometry measuring with a small gauge volume from the sample surface through the corrosion product allowed depth-resolved phase identification and revealed the presence of (Fe,Cr)2O3 and FeCr2O4. This was supplemented by microstructural and elemental analysis correlating the additional presence of a Ni-rich austenite phase to selective removal of Fe and Cr from the alloy, via a KCl-induced corrosion mechanism. Compositional variations were related to diffraction results and revealed a qualitative influence of the spinel cation concentration on the observed diffraction lines.

Original language	English
Journal	Metallography, Microstructure, and Analysis
Volume	6
Issue number	1
Pages (from-to)	22–35
Number of pages	14
ISSN	2192-9262
DOIs	https://doi.org/10.1007/s13632-016-0325-6
Publication status	Published - 2017

Keywords

Stainless steel
(Synchrotron) X-ray diffraction
SEM
High-temperature corrosion
Chlorination
Spinel

Access to Document

10.1007/s13632-016-0325-6

Okoro et alAccepted author manuscript, 1.63 MB

Cite this

Okoro, S. C., Nießen, F., Villa, M., Apel, D., Montgomery, M., Jappe Frandsen, F., & Pantleon, K. (2017). Complementary Methods for the Characterization of Corrosion Products on a Plant-Exposed Superheater Tube. Metallography, Microstructure, and Analysis, 6(1), 22–35. https://doi.org/10.1007/s13632-016-0325-6

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abstract = "In this work, complex corrosion products on a superheater tube exposed to biomass firing were characterized by the complementary use of energy-dispersive synchrotron diffraction, electron microscopy, and energy-dispersive X-ray spectroscopy. Non-destructive synchrotron diffraction in transmission geometry measuring with a small gauge volume from the sample surface through the corrosion product allowed depth-resolved phase identification and revealed the presence of (Fe,Cr)2O3 and FeCr2O4. This was supplemented by microstructural and elemental analysis correlating the additional presence of a Ni-rich austenite phase to selective removal of Fe and Cr from the alloy, via a KCl-induced corrosion mechanism. Compositional variations were related to diffraction results and revealed a qualitative influence of the spinel cation concentration on the observed diffraction lines. ",

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Complementary Methods for the Characterization of Corrosion Products on a Plant-Exposed Superheater Tube. / Okoro, Sunday Chukwudi; Nießen, Frank; Villa, Matteo; Apel, Daniel; Montgomery, Melanie; Jappe Frandsen, Flemming ; Pantleon, Karen.

In: Metallography, Microstructure, and Analysis, Vol. 6, No. 1, 2017, p. 22–35.

Research output: Contribution to journal › Journal article › Research › peer-review

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AU - Okoro, Sunday Chukwudi

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AU - Jappe Frandsen, Flemming

AU - Pantleon, Karen

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AB - In this work, complex corrosion products on a superheater tube exposed to biomass firing were characterized by the complementary use of energy-dispersive synchrotron diffraction, electron microscopy, and energy-dispersive X-ray spectroscopy. Non-destructive synchrotron diffraction in transmission geometry measuring with a small gauge volume from the sample surface through the corrosion product allowed depth-resolved phase identification and revealed the presence of (Fe,Cr)2O3 and FeCr2O4. This was supplemented by microstructural and elemental analysis correlating the additional presence of a Ni-rich austenite phase to selective removal of Fe and Cr from the alloy, via a KCl-induced corrosion mechanism. Compositional variations were related to diffraction results and revealed a qualitative influence of the spinel cation concentration on the observed diffraction lines.

KW - Stainless steel

KW - (Synchrotron) X-ray diffraction

KW - SEM

KW - High-temperature corrosion

KW - Chlorination

KW - Spinel

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