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Effect of KCl on high-temperature corrosion of low-alloyed steel under low oxygen partial pressure
RISE Research Institutes of Sweden, Materials and Production, Corrosion.ORCID iD: 0000-0001-6256-7123
RISE Research Institutes of Sweden, Materials and Production, Corrosion.ORCID iD: 0000-0002-2339-9443
2024 (English)In: Materials and corrosion - Werkstoffe und Korrosion, ISSN 0947-5117, E-ISSN 1521-4176Article in journal (Refereed) Epub ahead of print
Abstract [en]

Low oxygen environments in biomass gasification and the presence of chlorine in feedstocks can influence the corrosion rate of steel by affecting the formation of protective oxide scales. The effect of KCl on the high-temperature corrosion of low-alloyed steel (13CrMo4-5) under low oxygen partial pressure is investigated by KCl salt spray (0.1 mg·cm−2) and exposure to 3 vol% H2 + 30 vol% H2O + Ar (balance) at 500°C for up to 168 h. Specimens without KCl salt are exposed for reference. Specimens are characterized after exposure by mass change, SEM/EDS, and XRD. KCl-deposited specimens exhibit about 30% lower mass gain after exposure compared to non-sprayed specimens. Their scale shows a porous innermost layer and a denser layer on top. No Fe or Cr chlorides are identified. The specimens without salt exhibit a similar two-layered scale, with a porous inner Fe-Cr oxide, followed by a denser and thicker Fe-oxide above. KCl could potentially protect the surface from further degradation by physically covering the specimen, altering the scale morphology, and forming a less permeable barrier, hindering the transport of species through the scale. 

Place, publisher, year, edition, pages
John Wiley and Sons Inc , 2024.
Keywords [en]
Alloy steel; Atmospheric temperature; Chromium alloys; Chromium compounds; Corrosion protection; Corrosion rate; Gasification; Iron oxides; Morphology; Oxygen; Potash; Potassium chloride; Scale (deposits); Steel corrosion; Biomass Gasification; High temperature corrosions; Low alloyed steels; Low oxygen; Low oxygen partial pressure; Mass change; Oxide scale; Protective oxides; Reducing atmosphere; Salt spray; High temperature corrosion
National Category
Corrosion Engineering
Identifiers
URN: urn:nbn:se:ri:diva-73234DOI: 10.1002/maco.202414314Scopus ID: 2-s2.0-85193030266OAI: oai:DiVA.org:ri-73234DiVA, id: diva2:1860596
Note

Eric Börjesson is gratefully acknowledged for performing valuable laboratory work. The work was performed within the Swedish High Temperature Corrosion Centre (HTC) and it was funded by the Swedish Energy Agency. Alleima (formerly Sandvik), Cortus Energy, Kanthal, and Phoenix Biopower are acknowledged as valuable project partners. Alleima (formerly Sandvik) and Kanthal are acknowledged for providing the test materials.

Available from: 2024-05-24 Created: 2024-05-24 Last updated: 2024-05-24Bibliographically approved

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Moya Nunez, AliceNorling, Rikard

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