Oxidation of FeCrAl foils at 500–900°C in dry O2and O2with 40% H2O

Engkvist, Josefin; Canovic, Sead; Liu, Fang; Götlind, Helena; Svensson, Jan‐Erik; Johansson, Lars‐Gunnar; Olsson, Mikael; Halvarsson, Mats

doi:10.3184/096034009x464311

Cited by 32 publications

(14 citation statements)

References 1 publication

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“…A sputter rate of 19 nm/min was obtained when calibrated against Ta 2 O 5 standards. The sputter rate in polycrystalline alumina is approximately half the rate obtained in the Ta 2 O 5 standards as determined in our earlier studies …”

Section: Methodssupporting

confidence: 71%

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The initial effect of KCl deposit on alumina scales characterized by ToF‐SIMS and AES

Engkvist

Israelsson

Bexell

2012

Surface & Interface Analysis

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A FeCrAl alloy was preoxidized to form a protective alumina scale, and the effect of KCl deposits on the alumina scale was investigated while exposed during 1 and 24 h at 600 C. However, impurity concentrations in the alumina scale change the ion conductivity and hence affect its protective properties. Therefore, Auger electron spectroscopy and time-of-flight secondary ion mass spectrometry were used to characterize the alumina scales and detect traces of K and Cl. The results showed that K and Cl existed as large sharp-edged crystals surrounded by a dendritic network after 1 h. However, after 24 h, those were dissolved, and K together with Cl was detected only in the outer layer of the duplex alumina scale, which was formed during preoxidation.

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Section: Methodssupporting

confidence: 71%

“…One way to solve that problem may be to replace chromia forming steels with alumina forming FeCrAl alloys. These types of alloys form protective alumina scales that do not as easily suffer from this kind of degradation even at higher temperatures . Alumina scales are relatively slow growing and electrically insulating type of oxides.…”

Section: Introductionmentioning

confidence: 99%

The initial effect of KCl deposit on alumina scales characterized by ToF‐SIMS and AES

Engkvist

Israelsson

Bexell

2012

Surface & Interface Analysis

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“…2, 3, 4 and 5). The oxide scale microstructure is similar to that reported in studies of the early oxidation of commercial FeCrAl alloys at 900 °C [13,19,20]. Those studies report that the inner dense oxide consists of inward-grown α-alumina while the outer layer is outward-grown and it was concluded that the interface between the inner and outer layers corresponds to the original alloy surface.…”

Section: Discussionsupporting

confidence: 82%

Exploring the Effect of Silicon on the High Temperature Corrosion of Lean FeCrAl Alloys in Humid Air

et al. 2021

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A new approach to reduce the chromium and aluminium concentrations in FeCrAl alloys without significantly impairing corrosion resistance is to alloy with 1–2 wt.% silicon. This paper investigates the “silicon effect” on oxidation by comparing the oxidation behavior and scale microstructure of two FeCrAl alloys, one alloyed with silicon and the other not, in dry and wet air at 600 °C and 800 °C. Both alloys formed thin protective oxide scales and the Cr-evaporation rates were small. In wet air at 800 °C the Si-alloyed FeCrAl formed an oxide scale containing mullite and tridymite together with α- and γ-alumina. It is suggested that the reported improvement of the corrosion resistance of Al- and Cr-lean FeCrAl’s by silicon alloying is caused by the appearance of Si-rich phases in the scale.

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“…[34,42,57,[37][38][39][40] The transient alumina layer has been shown to be protective and limits the propagation of the oxidation process. [34,42,57,58] However, the oxide microstructure of the thin protective scales is not well characterized. Reference 59 showed presence of small amount of Al in the protective scale formed on the surface of the FeCrAl alloys at 600 C. The kinetics of the transient alumina or a Cr-rich oxide has properties similar to the scale found on stainless steels.…”

Section: Experimental Observations Of High-temperature Corrosionmentioning

confidence: 99%

Strategies for High-Temperature Corrosion Simulations of Fe-Based Alloys Using the Calphad Approach: Part I

Bigdeli

Kjellqvist²,

Naraghi³

et al. 2021

J. Phase Equilib. Diffus.

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The environmental degradation of materials at high temperatures limits the useful life of different industrial components and hinders the development of more economical and environmentally friendly processes for the energy production. Despite the importance of this phenomena, a model to predict lifetime of materials that degrade due to high-temperature corrosion has up till now been lacking due to limitations of the computational possibilities and the complex nature of oxidation. In the present work we develop some strategies to model high-temperature corrosion in Fe-based alloys using the Calphad (Calculation of Phase Diagrams) approach. It is proposed that kinetic-based simulations for oxidation of Al and Cr can accurately represent the lifetime of the protective layers in FeCrAl and FeCr alloys at different temperatures in air. The oxide systems are in addition investigated by equilibrium calculations. The corrosion mechanisms of FeCr and FeCrAl alloys are discussed based on theoretical and experimental knowledge.

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Oxidation of FeCrAl foils at 500–900°C in dry O₂and O₂with 40% H₂O

Cited by 32 publications

References 1 publication

The initial effect of KCl deposit on alumina scales characterized by ToF‐SIMS and AES

The initial effect of KCl deposit on alumina scales characterized by ToF‐SIMS and AES

Exploring the Effect of Silicon on the High Temperature Corrosion of Lean FeCrAl Alloys in Humid Air

Strategies for High-Temperature Corrosion Simulations of Fe-Based Alloys Using the Calphad Approach: Part I

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