The oxidation of two ternary Fe-Cu-10 at.% Al alloys in 1 atm of pure O2 at 800-900 °C |
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Authors: | JH Xiang F Gesmundo |
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Affiliation: | a State Key Laboratory for Corrosion & Protection, Institute of Metal Research, The Chinese Academy of Sciences, Wencui Rd 62, 110016 Shenyang, China b DICheP, Università di Genova, Fiera del Mare, Pad. D, 16129 Genova, Italy |
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Abstract: | The oxidation of two ternary Fe-Cu-Al alloys containing 10 at.% Al (Fe-65Cu-10Al and Fe-30Cu-10Al) has been studied at 800-900 °C under 1 atm O2. Under all conditions both alloys show an initial faster stage during which Fe-65Cu-10Al corrodes more rapidly at 800 °C than at 900 °C, while Fe-30Cu-10Al follows nearly identical kinetics at both temperatures. As oxidation proceeds, a continuous alumina layer is eventually established on the surface of the two alloys, thus decreasing significantly their oxidation rates. Altogether, the Fe-rich alloy Fe-30Cu-10Al oxidizes slightly faster than the Cu-rich alloy Fe-65Cu-10Al at both temperatures. The possible reasons for the decrease in the critical Al content needed to form external alumina scales for the Cu-rich alloy in comparison with binary Cu-Al alloys are examined. |
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Keywords: | Ternary alloys Iron-copper base Oxidation Aluminum effect |
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