Corrosion Behaviors with the Variation of the Accumulated Annealing Parameters in New Zr-alloy for the Nuclear Fuel Claddings

摘要

The effect of the accumulated annealing parameters on corrosion was investigated for the Zr-based alloy, whose Nb content was more than its solubility limit. From the corrosion tests, the corrosion resistance of the alloy decreased with the increase of the accumulated annealing parameter in all corrosion conditions. And it was observed that the size of the precipitates and the hydrogen pick-up fraction increased with increasing the accumulated parameter. The large precipitates induced the high corrosion rate because the large precipitates resulted in the early transformation of the oxide structure from t-ZrO_2 to m-ZrO_2 and oxide micro structure from columnar to equiaxed structure.