Oxidation of Metals

, Volume 6, Issue 3, pp 181–196 | Cite as

High-temperature corrosion of low Cr-Fe alloys in sulfur vapor

  • Toshio Narita
  • Keizo Nishida


The sulfidation behavior of low Cr-Fe alloys was studied over the range of 700–900°C under 1 atm of pure sulfur vapor. Sulfidation of alloys with 3.7 and 7.4 wt.% Cr does not follow the parabolic rate law at 750–800° C, although for other alloy compositions and temperatures it obeys that law. Sulfide scales consisted of a three-layer structure. The outer layer was FeS, but the inner and intermediate layers contained FeS, FeCr2S4, and Cr3S4, their relative amounts and morphologies depending on the corrosion temperature and alloy composition. Increasing Cr contents resulted in a change in the morphology of FeCr2S4 from dispersed particles to a thick layer. Ultimately, FeCr2S4 was displaced by Cr3S4. The formation of FeCr2S4 and the scale growth mechanism are discussed also.


Sulfide Disperse Particle Outer Layer Alloy Composition Growth Mechanism 
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Copyright information

© Plenum Publishing Corporation 1973

Authors and Affiliations

  • Toshio Narita
    • 1
  • Keizo Nishida
    • 1
  1. 1.Metals Research Institute, Faculty of EngineeringHokkaido UniversitySapporoJapan

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