The influence of chromium on early high temperature corrosion of ferritic alloys under SO<sub>2</sub> atmosphere

Nützmann, Kathrin; Kranzmann, Axel; Stephan-Scherb, Christiane

doi:10.1080/09603409.2018.1446705

Cited by 19 publications

(15 citation statements)

References 20 publications

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“…The amount of hematite is not that high, assuming the entire proportion of Fe 3+ can be divided between hematite and the observed magnetite. The oxidation–sulfidation mechanism for Fe2Cr exposed to 0.5% SO 2 proceeds similar as previously reported for pure iron …”

Section: Discussionsupporting

confidence: 81%

“…A thinner scale for the higher‐alloyed material is expected, since the formation of Cr‐rich oxides, acting protective and preventing a thick scale growth is anticipated for 13% of weight chromium within the alloy. The scale spalls off during the aging process (see Figure a) and the details of the scale growth mechanism were reported by Nützmann et al in a previous study. Nevertheless, the porous chromium‐ and sulfur‐rich part corresponds to the inner corrosion zone, whereas the iron‐ and oxygen‐rich part refers to the external grown corrosion area.…”

Section: Resultssupporting

confidence: 75%

“…In all studied materials, the sulfides occur at the alloy interface. The detailed mechanism for this observation was already reported in previous studies …”

Section: Discussionsupporting

confidence: 67%

“…The sulfides are strongly localized at the alloy interface, illustrated clearly by the sharp compositional depth profile regarding the Fe 2+ and Fe 3+ cation distribution through the scale as observed by µ‐XANES. The detailed scale structure on Fe–Cr model alloys with 13% of weight chromium exposed to oxidizing/sulfurizing atmosphere was already described in a previous publication …”

Section: Discussionmentioning

confidence: 99%

“…Fe–Cr model alloys with 0%, 2%, 9%, and 13% chromium in weight were commercially purchased (HMW‐HAUNER) and exposed to 0.5% SO 2 in volume (argon balance) at 650°C using a tubular furnace. Details of the experimental setup, gas flow rates, and sample pretreatment can be found elsewhere …”

Section: Methodsmentioning

confidence: 99%

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A µ‐XANES study of the combined oxidation/sulfidation of Fe–Cr model alloys

Weber

Buzanich

Radtke

et al. 2019

Materials & Corrosion

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The precise analysis of cation diffusion profiles through corrosion scales is an important aspect to evaluate corrosion phenomena under multicomponent chemical load, as during high‐temperature corrosion under deposits and salts. The present study shows a comprehensive analysis of cation diffusion profiles by electron microprobe analysis and microbeam X‐ray absorption near edge structure (µ‐XANES) spectroscopy in mixed oxide/sulfide scales grown on Fe–Cr model alloys after exposing them to 0.5% SO2. The results presented here correspond to depth‐dependent phase identification of oxides and sulfides in the corrosion scales by µ‐XANES and the description of oxidation‐state‐dependent diffusion profiles. Scales grown on low‐ and high‐alloyed materials show both a well‐pronounced diffusion profile with a high concentration of Fe3+ at the gas and a high concentration of Fe2+ at the alloy interface. The distribution of the cations within a close‐packed oxide lattice is strongly influencing the lattice diffusion phenomena due to their different oxidation states and therefore different crystal‐field preference energies. This issue is discussed based on the results obtained by µ‐XANES analysis.

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Section: Discussionsupporting

confidence: 81%

Section: Resultssupporting

confidence: 75%

“…In all studied materials, the sulfides occur at the alloy interface. The detailed mechanism for this observation was already reported in previous studies …”

Section: Discussionsupporting

confidence: 67%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

A µ‐XANES study of the combined oxidation/sulfidation of Fe–Cr model alloys

Weber

Buzanich

Radtke

et al. 2019

Materials & Corrosion

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Early Material Damage in Equimolar CrMnFeCoNi in Mixed Oxidizing/Sulfiding Hot Gas Atmosphere

et al. 2022

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The challenges to use more varied fuels at medium and high temperatures above 500 °C need to be addressed by tuning the materials toward a better resistance against increased corrosion. As a first step the corrosion processes need to be better understood, especially in the case of the unavoidable and highly corrosive sulfur‐based gases. Herein, oxidation/sulfidation of an equimolar CrMnFeCoNi high‐entropy alloy is studied at an early stage after hot gas exposure at 600 °C for 6 h in 0.5% SO2 and 99.5% Ar. The oxidation process is studied by means of X‐ray diffraction, scanning and transmission electron microscopy, and supported by thermodynamic calculations. It is found that the sulfur does not enter the bulk material but interacts mainly with the fast‐diffusing manganese at grain boundary triple junctions at the alloy surface. Submicrometer scaled Cr–S–O‐rich phases close to the grain boundaries complete the sulfur‐based phase formation. The grains are covered in different Fe‐, Mn‐, and Cr‐based spinels and other oxides.

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Investigation on High Temperature Corrosion Characteristic of Super304H, TP347H, and HR3C Steel in an Ultra‐supercritical Coal‐fired Boiler^▴

Wang

Liang

et al. 2020

Fuel Cells

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The high temperature corrosion characteristic of Super304H, TP347H, and HR3C steel in an ultra‐supercritical coal‐fired boiler with service time of 17,973 h was investigated. The samples were analyzed by XRD, SEM, and EDS. The results showed that corrosion scales were composed and could be divided into three layers, including outer layer with composite reaction of alkalis and sulfate, middle layer with oxidation, and penetrated inner layer with oxidation and sulfidation. In addition, spalling of corrosion scales in the Super304H and TP347H samples was observed with the reasons of low Cr content and thermal expansion difference between different corrosion layers.

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The influence of chromium on early high temperature corrosion of ferritic alloys under SO₂ atmosphere

Cited by 19 publications

References 20 publications

A µ‐XANES study of the combined oxidation/sulfidation of Fe–Cr model alloys

A µ‐XANES study of the combined oxidation/sulfidation of Fe–Cr model alloys

Early Material Damage in Equimolar CrMnFeCoNi in Mixed Oxidizing/Sulfiding Hot Gas Atmosphere

Investigation on High Temperature Corrosion Characteristic of Super304H, TP347H, and HR3C Steel in an Ultra‐supercritical Coal‐fired Boiler^▴

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The influence of chromium on early high temperature corrosion of ferritic alloys under SO2 atmosphere

Cited by 19 publications

References 20 publications

A µ‐XANES study of the combined oxidation/sulfidation of Fe–Cr model alloys

A µ‐XANES study of the combined oxidation/sulfidation of Fe–Cr model alloys

Early Material Damage in Equimolar CrMnFeCoNi in Mixed Oxidizing/Sulfiding Hot Gas Atmosphere

Investigation on High Temperature Corrosion Characteristic of Super304H, TP347H, and HR3C Steel in an Ultra‐supercritical Coal‐fired Boiler▴

Contact Info

Product

Resources

About

The influence of chromium on early high temperature corrosion of ferritic alloys under SO₂ atmosphere

Investigation on High Temperature Corrosion Characteristic of Super304H, TP347H, and HR3C Steel in an Ultra‐supercritical Coal‐fired Boiler^▴