High-temperature corrosion of weld overlay coating/bulk FeCrAl exposed in O2 + H2O + KCl(s) at 600 °C – A microstructural investigation

Imran Hanif; Vicent Ssenteza; Johan Eklund; Johanna Nockert Olovsjö; Torbjörn Jonsson

Journal of Materials Research and Technology (Jul 2023)

High-temperature corrosion of weld overlay coating/bulk FeCrAl exposed in O2 + H2O + KCl(s) at 600 °C – A microstructural investigation

Imran Hanif,
Vicent Ssenteza,
Johan Eklund,
Johanna Nockert Olovsjö,
Torbjörn Jonsson

Affiliations

Imran Hanif: Environmental Inorganic Chemistry, Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-412 96, Göteborg, Sweden; Energy Technology Center, RISE Research Institutes of Sweden; Corresponding author. Environmental Inorganic Chemistry, Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-412 96, Göteborg, Sweden.
Vicent Ssenteza: Environmental Inorganic Chemistry, Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-412 96, Göteborg, Sweden
Johan Eklund: Environmental Inorganic Chemistry, Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-412 96, Göteborg, Sweden
Johanna Nockert Olovsjö: Kanthal AB, Hallstahammar, Sweden
Torbjörn Jonsson: Environmental Inorganic Chemistry, Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-412 96, Göteborg, Sweden

Journal volume & issue: Vol. 25
pp. 7008 – 7023

Abstract

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This work investigates the impact of high-temperature corrosion behavior of the newly developed FeCrAl alloy Kanthal® EF101 bulk material and weld overlay coating in the presence of KCl(g)/KCl(s) at 600 °C. The oxide scale formed within the secondary corrosion regime after exposure and the impact of alloy microstructure on corrosion behavior was investigated using scanning transmission electron microscopy. The findings indicated the key microstructural differences is the alloy grain size which influences the formation of a protective scale. In addition, It is indicated that coating exhibited inferior performance than the bulk material, primarily attributed to the microstructural differences.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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