Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Microstructural Investigations of $Al_2O_3$ Scale Formed on FeCrAl Steel during High Temperature Oxidation in $SO_2$

  • Homa, M. (Department of Inorganic Chemistry and Technology, Cracow University of Technology) ;
  • Zurek, Z. (Department of Inorganic Chemistry and Technology, Cracow University of Technology) ;
  • Morgiel, B. (lnstitute of Metallurgy and Materials Science, Polish Academy of Sciences) ;
  • Zieba, P. (lnstitute of Metallurgy and Materials Science, Polish Academy of Sciences) ;
  • Wojewoda, J. (lnstitute of Metallurgy and Materials Science, Polish Academy of Sciences)
  • Published : 2008.06.01
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Abstract

The results of microstructure observations of the $Al_2O_3$ scale formed on a Fe-Cr-Al steel during high temperature oxidation in the $SO_2$ atmosphere are presented. Morphology of the scale has been studied by SEM and TEM techniques. Phase and chemical compositions have been studied by EDX and XRD techniques. The alumina oxide is a primary component of the scale. TEM observations showed that the scale was multilayer. The entire surface of the scale is covered with "whiskers", which look like very thin platelets and have random orientation. The cross section of a sample shows, that the "whiskers" are approximately $2{\mu}m$ high, however the compact scale layer on which they reside is $0.2{\mu}m$ thick. The scale layer was composed mainly of small equiaxial grains and a residual amount of small columnar grains. EDX analysis of the scale surface showed that the any sulfides were found in the formed outer and thin inner scale layer. A phase analysis of the scale formed revealed that it is composed mainly of the $\theta-Al_2O_3$ phase and a residual amount of $\alpha-Al_2O_3$.

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References

  1. Li Meishuan, S. R. J Saunders, and D. D Gohil, High Temperature Corrosion and Protection Materials, p. 209 (2000)
  2. J. Balamin, M. K Loudjani, and A. M Huntz, Materials Science and Engineering, A224, 87 (1997)
  3. C. Badini, F. Laurella, Surface and Coatings Technology, 135, 291 (2001) https://doi.org/10.1016/S0257-8972(00)00989-0
  4. B. A. Pint, J. R. Martin, and L. W. Hobbs, Solid State Ionics, 78, 99 (1995) https://doi.org/10.1016/0167-2738(95)00013-V
  5. K. Messaoudi, A. M. Huntz, and B. Lesage, Materials Science and Engineering, A247, 248 (1998)
  6. M. Boualam, G. Beranger, and M. Lambertin, Microscopy of Oxidation 2, p. 243, Cambridge (1993)
  7. M. Homa, Z. Zurek, A. Stawiarski, J. Zurek, A. Jaron, and A. Gil, Czasopismo Techniczne PK, Z. 2, p. 1
  8. E. Adrieu, A. Germidis, and R. Molins, Materials Science Forum, 251-254, 357 (1997) https://doi.org/10.4028/www.scientific.net/MSF.251-254.357
  9. A. Andoh, S. Taniguchi, and T. Shibata, Symposium on High-Temperature Corrosion and Protection 2000, p. 297, Hokkaido (2000)
  10. I. Barin and O. Knacke, Thermochemical Properties of Inorganic Substances Sprinter Verlag, Berlin (1977)
  11. M. Homa, Z. Zurek, A. Stawiarski, J. Zurek, A. Gil, A. Rakowska, and J. Jedliński, Materials Science Forum, 461-464, 131 (2004) https://doi.org/10.4028/www.scientific.net/MSF.461-464.131
  12. Z. Zurek, J. Jedlinski, J. Gilewicz-Wolter, M. Homa, and A. Bernasik, Defect and Diffusion Forum, 237-240, 971 (2005) https://doi.org/10.4028/www.scientific.net/DDF.237-240.971
  13. T. F. An, H. R. Guan, X. F. Sun, and Z. Q. Hu, Oxidation of Metals, 54 (2000)