The corrosion of titanium aluminides in H2/H2S/H2O atmospheres at 800-1000°C

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

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)191-214
Journal / PublicationOxidation of Metals
Volume56
Issue number3-4
Publication statusPublished - 2001
Externally publishedYes

Abstract

The corrosion behavior of three Ti-Al intermetallics containing 20, 30, and 40 wt.% Al was studied over the temperature range 800-1000°C in a H2/H2S/ H2O gas mixture. Ti-20Al and Ti-40Al alloys had the single-phase structure of Ti3Al and TiAl, respectively, while Ti-30Al was a two-phase mixture of Ti3 Al + TiAl. The corrosion kinetics followed the parabolic rate law in all cases, regardless of temperature and alloy composition. The parabolic rate constants increased with increasing temperature, but decreased with increasing Al content. The Ti-40Al alloy exhibited the best corrosion resistance among all alloys studied. The scales formed on Ti-Al intermetallics were heterophasic and duplex, consisting of an outer-scale layer of pure α-TiO2 and an inner layer of α-TiO2 with minor amounts of α-Al2O3 and Ti1-xS. The amount of α-Al2O3, which increased with increasing Al content, is responsible for the reduction of the corrosion rates as compared with those of pure Ti oxides. © 2001 Plenum Publishing Corporation.

Research Area(s)

  • α-Al2O3, α-TiO2, Corrosion, Ti1-xS, Titanium aluminides

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 corrosion of titanium aluminides in H2/H2S/H2O atmospheres at 800-1000°C. / Kai, W.; Chang, M. T.; Bai, C. Y.

In: Oxidation of Metals, Vol. 56, No. 3-4, 2001, p. 191-214.

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