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The effect of impurities on the formation of the inner porous layer in the Cu2O scale during copper oxidation was examined using 99.99 (4N), 99.9999% (6N) and floating-zone-refined (FZR, >99.9999) copper specimens at 800° C. Oxidation for 240 min shows that an inner porous layer was formed in the Cu2O scale near the Cu2O/Cu interface for 4N copper, but not for 6N and FZR copper. The results support...
In order to study the influence of small amount of impurities on the copper oxidation kinetics, the oxidation was examined at 600–1050°C in 0.1 MPa oxygen atmosphere using 99.5% (2N) and 99.9999% (6N) pure copper specimens. The influence of impurities has been discussed considering the roles of the nonprotective CuO layer, the impurity layer at the Cu2O–Cu interface, and the diffusion of copper in...
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