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Fresenius' Journal of Analytical Chemistry

, Volume 341, Issue 1–2, pp 79–82 | Cite as

AES and CEMS analysis of the formation of layers on Si steel under thermal treatment in a flux of H2/water vapour

  • T. Ternes
  • W. Meisel
  • P. Griesbach
  • D. Hanžel
  • P. Gütlich
Part I Electron Spectroscopy

Summary

The near surface diffusion and reaction processes in iron-silicon steel (3.1 wt.%Si) during 10 min decarburization in water vapour/hydrogen have been studied. The decarburization temperature has been varied between 506 and 714°C for the fixed partial pressure ratio pH2O/pH2=0.017. An outer layer of SiO2 forms on the surface with its thickness increasing with temperature. From 600°C upwards, the decarburization process is hindered and a cementite layer is formed below the SiO2 layer. The formation of fayalite at the surface has been studied at a fixed decarburization temperature with pH2O/pH2 ranging from 0.017 to 0.49. The scale thickness reduces abruptly just before the ratio pH2O/pH2 necessary for the wüstite formation is reached. Obviously, a new layer is formed which reduces the oxygen diffusion that much that a transition from internal to external oxidation occurs.

Keywords

SiO2 Cementite Pressure Ratio Decarburization Fayalite 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1991

Authors and Affiliations

  • T. Ternes
    • 1
  • W. Meisel
    • 1
  • P. Griesbach
    • 1
  • D. Hanžel
    • 1
  • P. Gütlich
    • 1
  1. 1.Institut für Anorganische und Analytische ChemieUniversität MainzMainzFederal Republic of Germany

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