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Zr-1.0Fe-0.2Cu合金在400 ℃/10.3 MPa过热蒸汽中的腐蚀行为
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上海大学 微结构重点实验室

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TG341

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国家自然科学基金资助(项目号51871141)


Corrosion Behavior of Zr-1.0Fe-0.2Cu alloy in 400 ℃/10.3 MPa Steam
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Laboratory for Microstructures,Shanghai University

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    摘要:

    以高纯锆为母材制备Zr-1.0Fe-0.2Cu合金,并在400 ℃/10.3 MPa过热蒸汽中进行腐蚀实验。用SEM和TEM对合金基体及其腐蚀后生成氧化膜的显微组织进行研究。结果表明:Zr-1.0Fe-0.2Cu合金中只存在底心正交的Zr3Fe第二相,Cu元素易偏聚在Zr3Fe相内,使其不易以Zr2Cu相的形式析出,Cu元素的添加能够细化合金中Zr3Fe第二相。Zr-1.0Fe-0.2Cu合金在 400 ℃/10.3 MPa过热蒸汽中腐蚀100 d后,耐腐蚀性能优于Zr-1.0Fe以及Zr-4重熔合金,表明添加少量的Cu元素有利于改善合金的耐腐蚀性能。在腐蚀氧化过程中,含Cu的Zr3Fe相会滞后于合金基体α-Zr相氧化而进入氧化膜。随着氧化进程的加深,第二相中的Zr元素氧化后会以t-ZrO2的形式存在,Fe元素则氧化成m-Fe3O4。伴随着第二相的氧化进程,合金元素Cu和Fe会在氧化膜中扩散流失,不再呈现聚集状态。

    Abstract:

    High purity zirconium was used as the base material to fabricate Zr-1.0Fe-0.2Cu alloy. The microstructure and corrosion behavior in 400 ℃/10.3 MPa superheated steam of this alloy were investigated using SEM and TEM. The results show that the Zr3Fe phase with orthogonal center structure is the typical second phase in the Zr-1.0Fe-0.2Cu alloy. Cu is prone to segregate to the Zr3Fe phase, rather than to form Zr2Cu phase. The addition of Cu element can refine the Zr3Fe phase in the alloy. When exposed to the superheated steam for 100 days, the corrosion resistance of Zr-1.0Fe-0.2Cu alloy is better than Zr-1.0Fe alloy and Zr-4 remelting alloy, which indicates that adding a small amount of Cu element is beneficial. In the oxidation process, Cu-containing Zr3Fe phase is oxidized behind the α-Zr matrix and is thus surrounded by the oxide film. As the oxidation progresses, Zr in the second phase is oxidized into tetragonal zirconia. Fe is oxidized into Fe3O4 phase with monoclinic structure. Further, the original aggregation state of Cu and Fe in the Zr3Fe phase has disappeared due to the diffusion and oxidation in the oxide film of these elements.

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彭丽婷,李强,连奥杰,张革,彭剑超,李毅丰,梁雪,姚美意. Zr-1.0Fe-0.2Cu合金在400 ℃/10.3 MPa过热蒸汽中的腐蚀行为[J].稀有金属材料与工程,2020,49(10):3445~3451.[Peng Liting, Li Qiang, Lian Aojie, Zhang Ge, Peng Jianchao, Li Yifeng, Liang Xue, Yao Meiyi. Corrosion Behavior of Zr-1.0Fe-0.2Cu alloy in 400 ℃/10.3 MPa Steam[J]. Rare Metal Materials and Engineering,2020,49(10):3445~3451.]
DOI:10.12442/j. issn.1002-185X.20190750

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  • 收稿日期:2019-09-13
  • 最后修改日期:2020-01-15
  • 录用日期:2020-01-19
  • 在线发布日期: 2020-11-04
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