Abstract
Abstract The corrosion behavior of oxidized and vacuum annealed Zr-1%Nb alloy was investigated at 450 C (842 F) in air and pressurized steam. The corrosion resistance of partially dissolved oxide films was found to decrease with the increase in the vacuum annealing temperature up to 600 C (1112 F). A linear relationship between the logarithm of the oxidation rate and the annealing temperature was obtained from which an activation energy of 39.5 K.cal/mole was calculated. The activation energy was found to be independent of the corrosive medium. The increase in corrosion rate is explained on the fact that oxygen ion vacancy gradient increases with the increase in the annealing temperature. The decrease of the corrosion rate in steam after vacuum annealing is attributed to the release of H2 and H during the treatment process.
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