2001•Corrsion Science and Technology ProtectionRequires access
OXIDATION OF Cu-20Ni-20Cr ALLOY IN PURE O 2 AT 700℃
Yanqing Niu
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Abstract
The oxidation behavior of Cu-20Ni-20Cr alloy was studied at 700℃ in pure oxygen. The oxidation kinetics deviates from the parabolic rate law and its instantaneous rate decreases continuously with time more rapidly than required by the parabolic rate law. Cu-20Ni-20Cr alloy is not able to form a continuous Cr 2O 3 layer on the surface of alloy or within the alloy, but produces complex scales containing mixtures of the oxides of various components as well as double oxides because the simultaneous presence of three phases prevents significant diffusion of chromium from the alloy outwards to the surface.