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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50810

Title: The Corrosion of Titanium Aluminides in H2/H2S/H2O Atmospheres at 800–1000°C
Authors: W. Kai
M. T. Chang
C. Y. Bai
Contributors: 國立臺灣海洋大學:材料工程研究所
Keywords: Corrosion
titanium aluminides
Date: 2001-03
Issue Date: 2018-10-26T01:04:06Z
Publisher: Oxidation of Metals
Abstract: 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 Ti3Al+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 Til-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.
Relation: 56(3-4) pp.191-214
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50810
Appears in Collections:[材料工程研究所] 期刊論文

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