Sulphidation/oxidation behaviour of TiAlCr and Al2Au coated Ti45Al8Nb alloy at 750°C

Dudziak, Tomasz, Du, Hu, Datta, Psantu, Wilson, Alasdair, Ross, Ian and Moser, Martin (2009) Sulphidation/oxidation behaviour of TiAlCr and Al2Au coated Ti45Al8Nb alloy at 750°C. Corrosion Science, 51 (5). pp. 1189-1196. ISSN 0010-938X

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Official URL: http://dx.doi.org/10.1016/j.corsci.2009.02.015

Abstract

In this paper, we present the sulphidation/oxidation behaviour of a Ti45Al8Nb (at%) alloy coated with different protective surface films. Two intermetallic coatings are considered; TiAlCr and Al2Au deposited by physical vapour deposition. The coated alloy was subjected to a H2/H2S/H2O yielding pS2 – 10?1 Pa and pO2 – 10?18 Pa potentials at 750 °C for up to 1000 h. The corrosion kinetics were determined by means of discontinuous gravimetry and the as-received and exposed samples were characterised using scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and X-ray diffraction analysis (XRD). The materials showed the development of a multilayered structure. In the case of the TiAlCr coated Ti45Al8Nb – base alloy, Al2O3, TiO2 and Cr2S3 developed. For the Al2Au coated Ti45Al8Nb samples an Al2O3 scale containing TiO2 nodules was observed at the surface.

Item Type: Article
Uncontrolled Keywords: titanium alloys, sulfidation, oxidation
Subjects: H800 Chemical, Process and Energy Engineering
J500 Materials Technology not otherwise specified
Department: Faculties > Engineering and Environment > Physics and Electrical Engineering
Depositing User: EPrint Services
Date Deposited: 19 Aug 2009 14:03
Last Modified: 10 Aug 2015 11:26
URI: http://nrl.northumbria.ac.uk/id/eprint/902

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