발간논문

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Vol.38, No.10, 1381 ~ 1389, 2000
Title
Effects of Annealing Parameter on Corrosion Mechanism in Zr-Sn-Nb Alloys
백종혁Jong Hyuk Baek,정용환Yong Hwan Jeong,김인섭In Sup Kim
Abstract
To investigate the effects of Nb content and annealing parameter on corrosion resistance in Zr 0.8Sn-xNb(x = 0.2, 0.4, 0.8%) alloys, corrosion tests have been carried out under 400℃ steam and 360℃ LiOH water conditions. As the annealing parameter increased, the corrosion resistance was rapidly increased in Zr-0.8Sn-0.2Nb alloys but decreased in Zr-0.8Sn-0.4Nb and Zr-0.8Sn-0.8Nb alloys in both corrosion conditions. The degradation of corrosion resistance in Zr-0.8Sn-0.4Nb was resulted from the decrease of Nb concentration in matrix and the increase of Nb concentration in precipitates due to the formation of Nb-containing precipitates when the annealing parameter increased. The increase of tetragonal ZrO₂ in the oxide of Zr-0.8Sn-0.4Nb gave rise to increase the corrosion resistance with decreasing the annealing parameter. And it was thought that the corrosion resistance of Zr-0.8Sn-0.8Nb increased with the decrease of super-saturated Nb content in matrix caused by the formation of β-Nb.
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