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李强,马帅,杨艳平,梁雪,彭剑超,姚美意,周邦新.Zr-Nb-Cu合金在500℃/10.3MPa过热蒸汽中的腐蚀行为[J].稀有金属材料与工程(英文),2018,47(9):2761~2766.[Li Qiang,Ma Shuai,Yang Yanping,Liang Xue,Peng Jianchao,Yao Meiyi and Zhou Bangxin.Corrosion Behavior of Zr-Nb-Cu Alloys in 500℃/10.3MPa Steam[J].Rare Metal Materials and Engineering,2018,47(9):2761~2766.]
Corrosion Behavior of Zr-Nb-Cu Alloys in 500℃/10.3MPa Steam
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Received:November 10, 2016  Revised:April 28, 2017
Key words: zirconium alloys  Nb  Cu  corrosion behavior
Foundation item:国家自然科学基金资助(项目号51271104,51171102)
Author NameAffiliation
Li Qiang,Ma Shuai,Yang Yanping,Liang Xue,Peng Jianchao,Yao Meiyi and Zhou Bangxin  
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      The corrosion behavior of Zr-Nb-Cu alloys in 500 ℃/10.3 MPa superheated steam were investigated in the present work. Severe non-uniform corrosion was occured in Zr-Nb-Cu alloys with low content of Nb or Cu elements, while Zr-0.2Nb-0.2Cu and Zr-0.2Nb-1.0Cu alloys demonstrated relative good corrosion resistance. It was found that the non-uniform corrosion behavior has been fully inhibited in Zr-0.2Nb-0.2Cu alloy, and further increase of amount of Cu element showed slight effect on the corrosion resistant behavior. The microstructure of zirconium alloys (especially the micro-pores, micro-cracks) is strongly related to the oxidation of alloying elements and precipitates. The presence of Nb in zirconium alloys would delay the oxidation of Zr2Cu phase and the corresponding diffusion of the oxidation products. Moreover, Nb element could also inhabit the formation of the cracks in the oxide film and the delay the transformation from columnar to equiaxed crystal morphology. Therefore, the addition of Nb element could improve the corrosion resistance of the zirconium alloys containing Cu elements.