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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 11    No. 4    August 2001

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Air oxidation of Cu-50Ni and Cu-70Ni alloys at 800℃
CAO Zhong-qiu(曹中秋)1, NIU Yan(牛 焱)1, F.Gesmundo2

1. State Key Laboratory for Corrosion and Protection,Institute of Metal Research,
Chinese Academy of Sciences, Shenyang 110015, P.R.China;
2. Istituto di Chimica, Facolt di Ingegneria, Universita di Genova,
Fiera delMare, Pad.D, 16129 Genova, Italy

Abstract:The air oxidation of Cu-Ni alloys with 50% and 70% nickel (mole fraction) at  800℃ was studied. The kinetic curves for the oxidation of the two alloys are complex and deviate from the parabolic rate law. Typical double-layered scales are produced, which consist of a CuO outer layer and an inner layer containing a mixture of Cu2O and NiO with many pores. Cu-50Ni presents a small degree of internal oxidation of nickel, which is observed in many binary doublephase systems, but is quite rare in single phase systems.

 

Key words: copper-nickel alloy; single-phase; hightemperature oxidation

ISSN 1672-7029
CN 43-1423/U

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