| The effects of Sn on the corrosion behavior of the Zr0.8NbxSn (x = 0.2, 0.4, 0.6, 0.8 and 1.0) alloys in 360℃ water, 400℃ steam and 360℃ LiOH solution were investigated. The specimen was annealed at three different conditions of 470℃, 490℃ and 510℃. The microstructures and the oxide characteristics were analysed by using TEM and XRD, respectively. Hydrogen absorption test was performed to find the correlation between corrosion and hydrogen pick-up fraction. Tensile tests were additionally performed. The corrosion rate in 360℃ water test was increased with addition of Sn, while in LiOH solution the corrosion rate was decreased. As the corrosion rate was increased, the fraction of tetragonal-ZrO₂ in oxide was decreased. The opposite result of corrosion behavior would be results from the different role of Sn on the corrosion mechanism in water and LiOH solution. The tensile strength was increased with the addition of Sn due to the solid solution hardening and precipitate hardening. |
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