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Abstract
Abstract The crystal structure of the oxide film of NZ8 alloy, corroded by static autoclave test in 360 °C Li water and 400 °C steam was investigated by Raman spectroscopy method in this paper. The results indicate that the oxide film of NZ8 alloy is mainly composed of monoclinic ZrO 2 , including a small amount of distorted tetragonal ZrO 2 . With the prolongation of corrosion time, the average content of the distorted tetragonal ZrO 2 in the oxide film decreases, that of monoclinic ZrO 2 increases, and tetragonal ZrO 2 transforms into monoclinic ZrO 2 . From the oxide/metal interface to the surface of the oxide film, the content of tetragonal ZrO 2 reduces gradually and it is the highest at the interface. At the same time, the tetragonal ZrO 2 content at the interface of NZ8 alloy oxide film, gained in 360 °C Li water for 98 d, is much higher than that in 400 °C steam for 70 d, and tetragonal ZrO 2 is not observed at the surface of the oxide film exposed to 400 °C steam. The transformation from tetragonal ZrO 2 to monoclinic ZrO 2 decides the corrosion properties of NZ8 alloy. Corrosion resistance is improved when the content of tetragonal ZrO 2 in oxide film increases.
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