Corrosion behavior of Y-Al alloys in a H2/H2S/H2O gas mixture at 800-950°C

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

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Author(s)

  • W. Kai
  • M. T. Chang
  • C. D. Liu
  • T. W. Lee

Detail(s)

Original languageEnglish
Pages (from-to)523-547
Journal / PublicationOxidation of Metals
Volume57
Issue number5-6
Publication statusPublished - Jun 2002
Externally publishedYes

Abstract

The corrosion behavior of pure Y and two Y-Al alloys containing 5 and 10 wt.% Al was studied over the temperature range 800-950°C in a H2/H2S H2O gas mixture. Both alloys had the two-phase structure of Y + Y2Al With the exception of Y-10Al, for which a kinetics inversion was observed between 800°C and higher temperatures (T≥850°C), the parabolic rate constants generally increased with increasing temperature, but decreased with increasing Al content. The scales formed on pure Y and the Y-Al alloys were single but heterophasic, consisting of mostly Y2O3 and minor Y2O2S. XRD results showed no evidence of A12O3 and pure sulfides. The formation of Y2O3 and Y2O2S on Y-10Al at 800°C resulted in a subsurface phase transformation from Y + Y2Al to YAl2 and broke the structural integrity of the scale, being responsible for the fast corrosion rate.

Research Area(s)

  • Corrosion, Y-A1 alloys, Y2O2S, Y2O3

Bibliographic Note

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Citation Format(s)

Corrosion behavior of Y-Al alloys in a H2/H2S/H2O gas mixture at 800-950°C. / Kai, W.; Chang, M. T.; Liu, C. D.; Lee, T. W.

In: Oxidation of Metals, Vol. 57, No. 5-6, 06.2002, p. 523-547.

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