TY - JOUR
T1 - Complementary Methods for the Characterization of Corrosion Products on a Plant-Exposed Superheater Tube
AU - Okoro, Sunday Chukwudi
AU - Nießen, Frank
AU - Villa, Matteo
AU - Apel, Daniel
AU - Montgomery, Melanie
AU - Jappe Frandsen, Flemming
AU - Pantleon, Karen
PY - 2017
Y1 - 2017
N2 - 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.
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
U2 - 10.1007/s13632-016-0325-6
DO - 10.1007/s13632-016-0325-6
M3 - Journal article
SN - 2192-9262
VL - 6
SP - 22
EP - 35
JO - Metallography, Microstructure, and Analysis
JF - Metallography, Microstructure, and Analysis
IS - 1
ER -