Abstract
The effect of oxygen partial pressure on the oxidation of Zr and Zr-2.5wt% Nb alloy was investigated in the oxygen partial pressure range from 1 to 10 5 Pa and at the temperature range from 673 to 973K. The oxidation of zirconium obeyed the parabolic rate law, and the parabolic rate constants obtained were independent of the oxygen partial pressure at constant temperature between 673 and 973K. The activation energy for the oxidation of zirconium was about 130 kJ/mol which may correspond to the diffusion of oxygen in α-Zr. The oxidation rate of Zr-2.5wt% Nb alloy at higher temperatures and in higher oxygen partial pressures obeyed the parabolic rate law at first, and then changed to linear rate law, probably due to propagation of some cracks formed in the oxide during the oxidation. The linear rate depended on the oxygen partial pressure, suggesting that the rate determining step of the oxidation of alloy was adsorption-dissociation of oxygen molecules on the surface of the alloy.
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