HIGH TEMPERATURE CORROSION OF COMMERCIAL FeCrAl ALLOYS (KANTHAL AF) IN NITROGEN GAS

  • Stojana Vesković-Bukudur Hidria d.d.
  • Janez Kovač Institute Josef Stefan
  • Blaž Karpe University of Ljubljana
  • Polona Umek Institute Josef Stefan
  • Aleš Nagode University of Ljubljana
  • Romana Cerc-Korošec University of Ljubljana
  • Milan Bizjak University of Ljubljana

Abstract


In the present study, the corrosion mechanism of commercial FeCrAl alloy (Kanthal AF) during annealing in nitrogen gas (4.6) at 900 °C and 1200 °C is outlined. Isothermal and thermo-cyclic tests with varying total exposure times, heating rates, and annealing temperatures were performed. Oxidation test in air and nitrogen gas were carried out by thermogravimetric analysis. The microstructure is characterized by scanning electron microscopy (SEM-EDX), Auger electron spectroscopy (AES), and focused ion beam (FIB-EDX) analysis. Our results show that the progression of corrosion takes place through the formation of localized subsurface nitridation regions, composed of AlN phase particles, which reduces the aluminum activity and causes embrittlement and spallation. The processes of Al-nitride formation and Al-oxide scale growth depend on annealing temperature and heating rate. We found that nitridation of the FeCrAl alloy is a faster process than oxidation during annealing in a nitrogen gas with low oxygen partial pressure and represents the main cause of alloy degradation.

Author Biographies

Janez Kovač, Institute Josef Stefan

LAPTP

assist.profesor

Blaž Karpe, University of Ljubljana

Faculty of Natural Sciences and Engineering

Department of materials and metallurgy

assist.profesor

Aleš Nagode, University of Ljubljana

Faculty of Natural Sciences and Engineering

Department of materials and metallurgy

assoc. profesor

Romana Cerc-Korošec, University of Ljubljana

Faculty of Chemisty and Chemical Technology

profesor

Milan Bizjak, University of Ljubljana

Faculty of Natural Sciences and Engineering

Department of materials and metallurgy

profesor

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Published
2019/04/17
How to Cite
Vesković-Bukudur, S., Kovač, J., Karpe, B., Umek, P., Nagode, A., Cerc-Korošec, R., & Bizjak, M. (2019). HIGH TEMPERATURE CORROSION OF COMMERCIAL FeCrAl ALLOYS (KANTHAL AF) IN NITROGEN GAS. Journal of Mining and Metallurgy, Section B: Metallurgy, 55(1), 55. Retrieved from https://aseestant.ceon.rs/index.php/jmm/article/view/19610
Issue
Vol. 55 No. 1 (2019)
Section
Original Scientific Paper

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