Air oxidation of Cu-50Ni and Cu-70Ni alloys at 800℃
(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)
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; hightemperature oxidation