Early stages of the oxidation of a FeCrAlRE alloy (Kanthal AF) at 900°C: A detailed microstructural investigation

Liu, Fang; Götlind, Helena; Svensson, Jan‐Erik; Johansson, Lars‐Gunnar; Halvarsson, Mats

doi:10.1016/j.corsci.2008.05.019

Cited by 62 publications

(65 citation statements)

References 29 publications

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“…In contrast to the present study, where the only crystalline compound identified was Cr 2 O 3 , c-and a-alumina were identified by Liu et al [21]. Similar to Liu et al [21], it is suggested that Cr and Fe enter the oxide film during transient oxidation, i.e., during sample heat-up. The evidence from SEM/EDX, XRD and IC clearly shows that KCl reacts to form K 2 CrO 4 on the alloy surface.…”

Section: Discussioncontrasting

confidence: 54%

“…H 2 O at 600°C consists of a top corundum-type layer and a bottom layer made up of non-crystalline alumina. A TEM investigation by Liu et al [21] of the oxide film formed on Kanthal Ò AF after 1 h in dry O 2 at 900°C showed that the oxide film (\100 nm) exhibited a central, chromium enriched band and an outer Fe enriched zone. In contrast to the present study, where the only crystalline compound identified was Cr 2 O 3 , c-and a-alumina were identified by Liu et al [21].…”

Section: Discussionmentioning

confidence: 99%

“…A TEM investigation by Liu et al [21] of the oxide film formed on Kanthal Ò AF after 1 h in dry O 2 at 900°C showed that the oxide film (\100 nm) exhibited a central, chromium enriched band and an outer Fe enriched zone. In contrast to the present study, where the only crystalline compound identified was Cr 2 O 3 , c-and a-alumina were identified by Liu et al [21]. Similar to Liu et al [21], it is suggested that Cr and Fe enter the oxide film during transient oxidation, i.e., during sample heat-up.…”

Section: Discussionmentioning

confidence: 99%

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KCl-Induced Corrosion of the FeCrAl Alloy Kanthal ® AF at 600 °C and the Effect of H2O

et al. 2014

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The present study investigates the influence of H 2 O and KCl on the high-temperature corrosion of the FeCrAl alloy Kanthal Ò AF. Polished samples, with and without applied KCl, were exposed isothermally to O 2 or O 2 ? H 2 O at 600°C. The samples were investigated using TGA, XRD, SEM/EDX, AES and IC. It was found that KCl accelerates corrosion and that a rapidly growing iron, chromium-rich oxide forms in both environments. Chromate formation and alloy chlorination are shown to initiate the formation of non-protective oxide scales. In addition, aluminium nitrides form in the alloy substrate in both environments.

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Section: Discussioncontrasting

confidence: 54%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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KCl-Induced Corrosion of the FeCrAl Alloy Kanthal ® AF at 600 °C and the Effect of H2O

et al. 2014

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“…In accordanc with Liu et al [24] (working at 900°C), it is proposed that the iron and chromium in the alumina film enters the film during transient oxidation, i.e., during and immediately after heat-up of the sample. The observation that the oxide film grows both inward and outward (see Fig.…”

Section: µMsupporting

confidence: 56%

KCl-Induced Corrosion of an FeCrAl Alloy at 600 °C in O2 + H2O Environment: The Effect of Pre-oxidation

et al. 2014

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The present study investigates the influence of H 2 O and KCl on the high temperature corrosion of an FeCrAl alloy at 600°C. Polished samples were exposed to O 2 or O 2 ? H 2 O and to O 2 ? H 2 O with KCl applied. The samples were investigated using SEM/EDX, XRD, IC, AES and SIMS. It was found that KCl accelerates corrosion and that a rapidly growing iron-rich oxide forms with time. Chromate formation is shown to initiate the formation of a non-protective oxide scale. Pre-oxidising the alloy before exposure in the presence of KCl had a strongly beneficial effect on the corrosion.

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“…These types of alloys have better mechanical properties than the ferritic ones and are of interest in many high-temperature applications, including biomass-and waste-fired boilers. Even though there have been several studies concern long term oxidation resistance of alumina-forming alloys, 16,[19][20][21] only a few investigations have been devoted to the very initial stages of the oxidation process 22 and attempts to pursue dynamic experiments at low temperature are scarce.…”

Section: In Situ Esem Investigation Of Kcl-induced Corrosion Of a Fecmentioning

confidence: 99%

In Situ ESEM Investigation of KCl-Induced Corrosion of a FeCrAl and a Model FeNiCrAl Alloy in Lab Air at 450°C

Mortazavi

Intiso

Israelsson

et al. 2015

J. Electrochem. Soc.

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The very early stages of KCl-induced corrosion of a FeCrAl and a FeNiCrAl alloy in an O 2 /H 2 O environment were studied using in-situ Environmental Scanning Electron Microscopy (ESEM). The samples were KCl contaminated and then exposed to lab air at a total pressure of 4.8 Torr at 450 • C. After exposure, the samples were analyzed using SEM-EDX, FIB and STEM-EDX. For both alloys, fast oxide growth occurred at the KCl particles. Far away from the KCl particles, a thin base oxide formed with potassium chromate nodules on top. The base oxide was layered, consisting of iron-chromium oxide on top and alumina in the bottom part. The FeCrAl alloy suffered internal oxidation while the FeNiCrAl did not. Both alloys formed sub-scale chlorides. A mechanism is proposed for the reaction of KCl on the surface and for the formation of different surface features at the KCl particles.

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Early stages of the oxidation of a FeCrAlRE alloy (Kanthal AF) at 900°C: A detailed microstructural investigation

Cited by 62 publications

References 29 publications

KCl-Induced Corrosion of the FeCrAl Alloy Kanthal ® AF at 600 °C and the Effect of H2O

KCl-Induced Corrosion of the FeCrAl Alloy Kanthal ® AF at 600 °C and the Effect of H2O

KCl-Induced Corrosion of an FeCrAl Alloy at 600 °C in O2 + H2O Environment: The Effect of Pre-oxidation

In Situ ESEM Investigation of KCl-Induced Corrosion of a FeCrAl and a Model FeNiCrAl Alloy in Lab Air at 450°C

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