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Title: The Corrosion of Cu–Al Binary Alloys in H2/H2S/H2O Atmospheres at 400–900◦C
Authors: W. Kai
G. W. Fan
P. C. Chen
Y. T. Lin
Contributors: 國立臺灣海洋大學:材料工程所
Keywords: corrosion
Cu–Al alloys
Date: 2004-06
Issue Date: 2018-10-26T01:36:47Z
Publisher: Oxidation of Metals
Abstract: Abstract: The corrosion behavior of pure Cu and of three Cu–Al alloys containing 1,
5, and 10 wt.% Al was studied at 400–900◦C in a H2/H2S/H2O gas mixture.
Both Cu–1Al and Cu–5Al alloys had the single-phase structure of α-Cu,
while Cu–10Al was the intermetallic compound Cu3Al. In general, the corrosion
behavior of all the alloys followed the parabolic rate law, and the
corrosion rate constants generally increased with increasing temperature but
decreased with increasing Al content. The scale formed on pure Cu was an
exclusive single layer of Cu2S, while the scales formed on Cu–Al alloys were
heterophasic and duplex, consisting of an outer layer of Cu2S and an inner
layer of Cu2S and CuAlS2. X-ray diffraction results showed no evidence of
oxides and the amount of CuAlS2 increased with increasing Al content. The
formation of Cu2S and CuAlS2 on higher Al-content alloys resulted in a subsurface
phase transformation from α-Cu (for Cu–5Al) or from Cu3Al (for
Cu–10Al) to Cu3Al + Cu9Al4. The formation of CuAlS2 in the inner layer
of Cu–Al alloys was responsible for the reduction of corrosion rates, as compared
to those of pure Cu.
Relation: 61(516)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50815
Appears in Collections:[材料工程研究所] 期刊論文

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