High temperature oxidation of Fe-Al and Fe-Cr-Al alloys: The role of Cr as a 
chemically active element

Airiskallio , E.; Nurmi , E.; Heinonen , M.H.; Väyrynen , I.J.; Kokko , K.; Ropo, Matti; Punkkinen , M.P.J.; Pitkänen  , H.; Alatalo  , M.; Kollár , J.; Johansson , B.; Vitos , L

doi:10.1016/j.corsci.2010.06.019

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High temperature oxidation of Fe-Al and Fe-Cr-Al alloys: The role of Cr as a chemically active element

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Ropo, Matti
Abo Akad Univ, Dept Informat Technol;
Fritz Haber Institute, Max Planck Society;

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Airiskallio, E., Nurmi, E., Heinonen, M., Väyrynen, I., Kokko, K., Ropo, M., et al. (2010). High temperature oxidation of Fe-Al and Fe-Cr-Al alloys: The role of Cr as a chemically active element. Corrosion Science, 52(10), 3394-3404. doi:10.1016/j.corsci.2010.06.019.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-29C2-7

Abstract

Good high-temperature corrosion resistance of Fe-Al alloys in oxidizing environments is due to the alpha-Al2O3 film which is formed on the surface provided temperature is above 900 degrees C and the Al-content of the alloy exceeds the critical value. Ab initio calculations combined with experiments on Fe-13Al, Fe-18Al, Fe-23Al and Fe-10Cr-10Al alloys show that the beneficial effect of Cr on the oxidation resistance is significantly related to bulk effects. The comparison of experimental and calculated results indicates a clear correlation between the Fe-Cr chemical potential difference and the formation of the protective oxide scales. (C) 2010 Elsevier Ltd. All rights reserved