Oxidation of Metals

, Volume 28, Issue 3–4, pp 165–181 | Cite as

Morphological development of oxide-sulfide scales on iron and iron-manganese alloys

  • G. McAdam
  • D. J. Young


Pure iron and alloys containing 2, 15, 25, and 50 wt. % manganese have been reacted at 1073 K in controlled gas atmospheres of SO2-CO2-CO-N2.Equilibrium gas compositions were such that (1) FeS was stable but not FeO, or (2) both FeS and FeO were stable, or (3) FeO was stable but not FeS; in all cases, both MnS and MnO were stable. Under all reaction conditions, pure iron corroded to produce both sulfide and oxide. The resultant scale morphologies were consistent with local solid-gas equilibrium for the case in which both oxide and sulfide were stable but in the other cases indicated that equilibrium was not achieved and that direct reaction with SO2(g) was responsible for corrosion. Additions of manganese did not greatly alter the scale morphologies. Under reaction conditions that were oxidizing and sulfidizing, very high levels of manganese were required to reduce the corrosion rate. On the other hand, relatively low levels had a beneficial effect both when FeO but not FeS was thermodynamically stable and similarly when FeS but not FeO was stable.

Key words

Iron iron-manganese alloys oxidation-sulfidation scale morphology 


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Copyright information

© Plenum Publishing Corporation 1987

Authors and Affiliations

  • G. McAdam
    • 1
  • D. J. Young
    • 1
  1. 1.School of Chemical Engineering and Industrial ChemistryThe University of New South WalesKensingtonAustralia

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