An ESEM in situ investigation of initial stages of the KCl induced high temperature corrosion of a Fe-2.25Cr-1Mo steel at 400 degrees C
Journal article, 2011
The initial oxidation of a low-alloyed steel (Fe-2.25Cr-1Mo) in the presence of small amounts of KCl(s) have been investigated through ESEM in situ exposure and analysis at 400 degrees C. The samples were also characterized by XRD, SEM/EDX and FIB. The present study shows the corrosive nature of KCl towards the low alloyed steel. It is concluded that the initial KCl distribution is important and that a KCl/FeCl2 liquid phase film forms on large parts of the oxide surface in the presence of KCl. It is proposed that Cl increases the oxidation rate (by decorating oxide grain boundaries) and decreases the oxide scale adhesion. (C) 2011 Elsevier Ltd. All rights reserved.
biomass
Low alloy steel
chromium
600-degrees-c
fired boilers
SEM
Chlorination
alloy sanicro 28
XRD
High temperature corrosion
diffusion
nickel
oxidizing atmospheres
iron oxidation
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Author
Torbjörn Jonsson
Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry
Nicklas Folkeson
Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry
Jan-Erik Svensson
Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry
Lars-Gunnar Johansson
Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry
Mats Halvarsson
Chalmers, Applied Physics, Microscopy and Microanalysis
Corrosion Science
0010-938X (ISSN)
Vol. 53 6 2233-2246Subject Categories
Chemical Sciences
DOI
10.1016/j.corsci.2011.03.007