Journal article
Influence of Preoxidation on High-Temperature Corrosion of a FeCrAl Alloy Under Conditions Relevant to Biomass Firing
Department of Chemical and Biochemical Engineering, Technical University of Denmark1
Department of Mechanical Engineering, Technical University of Denmark2
Materials and Surface Engineering, Department of Mechanical Engineering, Technical University of Denmark3
CHEC Research Centre, Department of Chemical and Biochemical Engineering, Technical University of Denmark4
Preoxidation of a commercial FeCrAl alloy (Kanthal APM) was evaluated as a surface modification approach to reduce alkali chloride-induced corrosion during biomass firing in power plants. Samples of the alloy preoxidized at 900 °C in O2 or O2 + 10 vol% H2O, and at 1100 °C in O2, were coated with KCl and exposed at 560 °C to a gas mixture comprising of 12 vol% CO2, 6 vol% O2, 3 vol% H2O, 400 ppmv HCl and 60 ppmv SO2.
The oxide formed at 1100 °C showed no reactivity with the corrosive species. By contrast, all samples preoxidized at 900 °C suffered severe attack, resulting in formation of Fe-, Cr- and Al-containing corrosion products in a heterogeneous morphology, similar to non-preoxidized samples. The observed differences with respect to the degree of corrosion attack on the preoxidized samples are discussed in terms of the composition and thickness of the different types of Al2O3 layers obtained by the preoxidation treatment.
Language: | English |
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Publisher: | Springer US |
Year: | 2018 |
Pages: | 99-122 |
ISSN: | 15734889 and 0030770x |
Types: | Journal article |
DOI: | 10.1007/s11085-017-9794-5 |
ORCIDs: | Okoro, Sunday Chukwudi , Montgomery, Melanie , Jappe Frandsen, Flemming and Pantleon, Karen |