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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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| Authors: | E Airiskallio E Nurmi MH Heinonen IJ Väyrynen K Kokko M Ropo MPJ Punkkinen H Pitkänen J Kollár L Vitos |
| Affiliation: | a Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland b Turku University Centre for Materials and Surfaces (MatSurf), Turku, Finland c Graduate School of Materials Research, Turku, Finland d Department of Information Technology, Åbo Akademi, FI-20500 Turku, Finland e Fritz-Haber-Institut der Max-Planck-Gesellschaft, D-14195 Berlin, Germany f Applied Materials Physics, Department of Materials Science and Engineering, Royal Institute of Technology, SE-10044 Stockholm, Sweden g Department of Mathematics and Physics, Lappeenranta University of Technology, P.O. Box 20, FI-53851 Lappeenranta, Finland h Research Institute for Solid State Physics and Optics, P.O. Box 49, Budapest H-1525, Hungary i Department of Physics and Materials Science, Uppsala University, SE-75121 Uppsala, Sweden |
| Abstract: | Good high-temperature corrosion resistance of Fe-Al alloys in oxidizing environments is due to the α-Al2O3 film which is formed on the surface provided temperature is above 900 °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. |
| Keywords: | A Alloy A Steel B AES C Oxidation C Passive films |
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