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

• 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.

Ämnesord

NATURVETENSKAP  -- Kemi (hsv//swe)

NATURAL SCIENCES  -- Chemical Sciences (hsv//eng)

Nyckelord

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

fe

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