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Oxidation of Metals

, Volume 17, Issue 5–6, pp 299–314 | Cite as

Sulfidation properties of Fe-Cr alloys at 1073 K in H2S-H2 atmospheres of sulfur pressures 10−2 and 10−5 Pa

  • T. Narita
  • W. W. Smeltzer
  • K. Nishida
Article

Abstract

An investigation is reported on the sulfidation properties of Fe-Cr alloys over their complete compositional range in H 2 S -H 2 atmospheres at 1073 K. Sulfidation of alloys containing less than 60 at. % Cr obeyed parabolic kinetics and alloys of larger chromium content and chromium followed linear kinetics. Scales were composed of two distinct layers: an outer columnar grained sulfide and an inner equiaxed grained sulfide layer of increased relative thickness and porosity at larger alloy chromium contents. The scales on quenched specimens were composed of either (CrFe) 5 S 6 or (FeCr)S plus small amounts of (FeCr) 3 S 4 at\(P_{S_2 }\) =10 −2 Pa and of (CrFe) 5 S 6 at\(P_{S_2 }\) =10 −5 Pa. Internal sulfidation was most pronounced in the high chromium content alloys and at the low sulfur pressure. The parabolic sulfidation rate at\(P_{S_2 }\) =10 −2 Pa was large and of practically constant value irrespective of alloy composition. These kinetics at\(P_{S_2 }\) =10 −5 Pa, however, increased from a very low value by three orders of magnitude as the alloy chromium content was increased from 5–60 at.%.

Key words

Sulfidation Fe-Cr alloys reaction mechanism 

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References

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Copyright information

© Plenum Publishing Corporation 1982

Authors and Affiliations

  • T. Narita
    • 1
  • W. W. Smeltzer
    • 2
  • K. Nishida
    • 1
  1. 1.Metals Research Institute, Faculty of EngineeringHokkaido UniversitySapporoJapan
  2. 2.Institute of Materials ResearchMcMaster UniversityHamiltonCanada

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