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Oxidation of Two Ternary Fe–Cu–5 at.% Al Alloys in 1 atm of Pure O2 at 800°C

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Abstract

The oxidation of two two-phase ternary Fe–Cu–Al alloys containing about 5 at.% aluminium, one Fe-rich and one Cu-rich, has been studied at 800°C under 1 atm O2. The Fe-rich alloy (Fe–15Cu–5Al) shows two parabolic stages, with a large decrease of the parabolic rate constant after about 2 hr. The presence of 5 at.% Al reduces significantly the oxidation rate of this alloy with respect to a binary Fe-Cu alloy of similar composition by forming an external alumina scale. Moreover, the addition of 15 at.% Cu is able to reduce the critical aluminium content needed to form alumina scales with respect to binary Fe–Al alloys. On the contrary, the Cu-rich Fe–85Cu–5 Al alloy presents a single parabolic stage and forms a thick and porous external scale composed of an outermost layer of copper oxides and an inner region containing a mixture of copper and Fe–Al oxides, coupled to the internal oxidation of iron and aluminium. As a result, the oxidation of the Cu-rich ternary alloy at 800°C is much faster than that of the Fe-rich ternary alloy.

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Authors and Affiliations

  1. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Wencui Rd 62, 110016, Shenyang, China

    J.H. Xiang, Y. Niu & F. Gesmundo

  2. Universitá di Genova, Fiera del Mare, Pad. D, 16129, Genova, Italy

    F. Gesmundo

Authors
  1. J.H. Xiang
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  2. Y. Niu
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  3. F. Gesmundo
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Correspondence to Y. Niu.

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Xiang, J., Niu, Y. & Gesmundo, F. Oxidation of Two Ternary Fe–Cu–5 at.% Al Alloys in 1 atm of Pure O2 at 800°C. Oxidation of Metals 61, 403–421 (2004). https://doi.org/10.1023/B:OXID.0000032331.52524.6f

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  • DOI: https://doi.org/10.1023/B:OXID.0000032331.52524.6f

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