Water vapour effects on Fe-Cr alloy oxidation

Norinsan Kamil Othman, Jianqiang Zhang, David J. Young

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

Isothermal oxidation at 700 °C of binary Fe-Cr alloys containing 9, 17 and 25 wt% chromium was measured using continuous thermogravimetric analysis. All alloys developed thin, protective chromia scales in Ar-20O 2 (vol%). Chromia scale growth on the 17 and 25 Cr alloys was faster in Ar-20O 2-5H 2O and Ar-5O 2-20H 2O. In these gases, the Fe-9Cr failed to form a chromia scale and suffered rapid breakaway oxidation, growing iron-rich oxides instead. A low oxygen potential gas, Ar-10H 2-5H 2O caused chromia scaling on Fe-17Cr and Fe-25Cr, but internal oxidation of Fe-9Cr. Application of Wagner's criterion for sustaining external scale growth is shown to account satisfactorily for these observations.

Original languageEnglish
Pages (from-to)337-352
Number of pages16
JournalOxidation of Metals
Volume73
Issue number1-2
DOIs
Publication statusPublished - Feb 2010

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Steam
Water vapor
Oxidation
Gases
Internal oxidation
Chromium
Oxides
Thermogravimetric analysis
Iron
Oxygen

Keywords

  • Alloy depletion
  • Diffusion
  • Parabolic kinetics
  • Scale-alloy interface

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Materials Chemistry
  • Metals and Alloys

Cite this

Water vapour effects on Fe-Cr alloy oxidation. / Othman, Norinsan Kamil; Zhang, Jianqiang; Young, David J.

In: Oxidation of Metals, Vol. 73, No. 1-2, 02.2010, p. 337-352.

Research output: Contribution to journalArticle

Othman, Norinsan Kamil ; Zhang, Jianqiang ; Young, David J. / Water vapour effects on Fe-Cr alloy oxidation. In: Oxidation of Metals. 2010 ; Vol. 73, No. 1-2. pp. 337-352.
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