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 journal › peer-review
Author(s)
Detail(s)
| Original language | English |
|---|---|
| Pages (from-to) | 523-547 |
| Journal / Publication | Oxidation of Metals |
| Volume | 57 |
| Issue number | 5-6 |
| Publication status | Published - Jun 2002 |
| Externally published | Yes |
Link(s)
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 journal › peer-review
