The high-temperature corrosion of Fe-Nb alloys in a H2/H2O/H2S gas mixture

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • W. Kai
  • D. L. Douglass
  • F. Gesmundo

Detail(s)

Original languageEnglish
Pages (from-to)189-215
Journal / PublicationOxidation of Metals
Volume37
Issue number3-4
Publication statusPublished - Apr 1992
Externally publishedYes

Abstract

The corrosion of Fe-Nb alloys containing up to 40 wt.% Nb has been studied over the temperature range 600-980°C in a mixed gas of constant composition having sulfur and oxygen pressures ranging from 10-8 to 10-4 atm. and from 10-27 to 10-18 atm., respectively. All alloys were two-phase, consisting of an Fe-rich solid solution and an intermetallic compound, Fe2Nb. The scales formed on the Fe-Nb alloys were duplex, consisting of an outer layer of iron sulfide (FeS) and an inner complex layer of FexNbS2(FeNb2S4 or FeNb3S6), FeS and unreacted Fe2Nb. No oxides were detected at any temperature. The addition of Nb reduced the corrosion rate. The corrosion kinetics of Fe-Nb alloys followed the parabolic rate law, regardless of alloy composition and temperature. Platinum markers, attached to the original alloy surfaces, were always located at the interface between the inner and outer scales. © 1992 Plenum Publishing Corporation.

Research Area(s)

  • corrosion kinetics, Fe-Nb alloys, FexNbS2, sulfidation

Bibliographic Note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to lbscholars@cityu.edu.hk.

Citation Format(s)

The high-temperature corrosion of Fe-Nb alloys in a H2/H2O/H2S gas mixture. / Kai, W.; Douglass, D. L.; Gesmundo, F.

In: Oxidation of Metals, Vol. 37, No. 3-4, 04.1992, p. 189-215.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review