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Raman Spectroscopy Analysis of Oxide Film of NZ8 Alloy Corroded in 360 °C Li Water and 400 °C Steam
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Raman Spectroscopy Analysis of Oxide Film of NZ8 Alloy Corroded in 360 °C Li Water and 400 °C Steam
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Shanxi Province Foundation for Returness(2011-031)

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    摘要:

    通過拉曼光譜法研究NZ8合金在360 ℃鋰水和400 ℃蒸汽的靜態(tài)高壓釜中腐蝕后氧化膜的晶體結(jié)構(gòu)。結(jié)果表明，NZ8合金的氧化膜主要由單斜氧化鋯組成，其中包括少量畸變的四方氧化鋯。隨著腐蝕時(shí)間的延長，氧化膜中平均四方氧化鋯含量不斷減少，單斜氧化鋯含量不斷增加，四方氧化鋯在向單斜氧化鋯轉(zhuǎn)變。從氧化膜/基體界面到氧化膜外表面，四方氧化鋯含量不斷減少，界面處四方氧化鋯含量最高。NZ8合金在360 ℃鋰水中腐蝕98 d后所得氧化膜/金屬界面處四方氧化鋯含量較其在400 ℃蒸汽中腐蝕70 d所得氧化膜/金屬界面處四方氧化鋯含量高，而且在400 ℃蒸汽中腐蝕后氧化膜外表面沒有四方氧化鋯形成。四方氧化鋯向單斜氧化鋯的轉(zhuǎn)變決定了NZ8合金的耐腐蝕性能。氧化膜中四方氧化鋯含量越高，則鋯合金的耐腐蝕性能越好。

    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 ZrO2, including a small amount of distorted tetragonal ZrO2. With the prolongation of corrosion time, the average content of the distorted tetragonal ZrO2 in the oxide film decreases, that of monoclinic ZrO2 increases, and tetragonal ZrO2 transforms into monoclinic ZrO2. From the oxide/metal interface to the surface of the oxide film, the content of tetragonal ZrO2 reduces gradually and it is the highest at the interface. At the same time, the tetragonal ZrO2 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 ZrO2 is not observed at the surface of the oxide film exposed to 400 °C steam. The transformation from tetragonal ZrO2 to monoclinic ZrO2 decides the corrosion properties of NZ8 alloy. Corrosion resistance is improved when the content of tetragonal ZrO2 in oxide film increases.

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章海霞,許并社,李中奎,Fruchart Daniel, Hlil Ei Kébir,周 廉. Raman Spectroscopy Analysis of Oxide Film of NZ8 Alloy Corroded in 360 °C Li Water and 400 °C Steam[J].稀有金屬材料與工程,2012,41(5):776~780.[Zhang Haixia, Xu Bingshe, Li Zhongkui, Fruchart Daniel, Hlil Ei Kébir.,Zhou Lian. Raman Spectroscopy Analysis of Oxide Film of NZ8 Alloy Corroded in 360 °C Li Water and 400 °C Steam[J]. Rare Metal Materials and Engineering,2012,41(5):776~780.]
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  • 收稿日期:2011-05-10
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