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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(英文),2020,49(10):3445~3451.[Peng Liting,Li Qiang,Lian Aojie,Zhang Ge,Peng Jianchao,Li Yifeng,Liang Xue and 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.]
Corrosion Behavior of Zr-1.0Fe-0.2Cu alloy in 400 ℃/10.3 MPa Steam
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Received:September 13, 2019  Revised:January 15, 2020
Key words: zirconium alloy  second phase particles  corrosion behavior  microstructure
Foundation item:国家自然科学基金资助(项目号51871141)
Author NameAffiliation
Peng Liting,Li Qiang,Lian Aojie,Zhang Ge,Peng Jianchao,Li Yifeng,Liang Xue and Yao Meiyi  
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      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.