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张欣,姚美意,彭剑超,周邦新.Zr-1Nb-xCu合金在400℃过热蒸汽中的耐腐蚀性能[J].稀有金属材料与工程(英文),2017,46(12):3910~3915.[zhangxin,yaomeiyi,pengjianchao and zhoubangxin.Corrosion Resistance of Zr-1Nb-xCu Alloys in Super-Heated Steam at 400 ℃[J].Rare Metal Materials and Engineering,2017,46(12):3910~3915.]
Corrosion Resistance of Zr-1Nb-xCu Alloys in Super-Heated Steam at 400 ℃
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Received:September 25, 2015  Revised:October 21, 2015
DOI:
Key words: zirconium  alloy, alloying  element Cu, corrosion  resistance, microstructure, nodular  corrosion
Foundation item:国家自然科学50871064和50971084,上海市重点学科建设项目S30107.
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zhangxin,yaomeiyi,pengjianchao and zhoubangxin  
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Abstract:
      The effect of Cu content on the corrosion resistance of Zr-1Nb-xCu alloys (x=0~0.5, mass fraction, %) was investigated in superheated steam at 400 ℃ and 10.3 MPa by autoclave tests. The microstructure of the alloys and the fracture surface of oxide films on the corroded specimens were observed by TEM and SEM, respectively. The results show that when the addition of Cu in the Zr-1Nb alloys is below 0.2%, the main second phase particles (SPPs) are β-Nb in smaller size, and Cu mainly dissolved in the α-Zr matrix, the corrosion resistance of the alloys is improved markedly with the increase of Cu content. When the addition of Cu is above 0.2%, the SPPs of Zr2Cu are precipitated. The size and amount of Zr2Cu particles become larger with the increase of Cu content. The Zr-1Nb-0.35Cu alloy, in which the SPPs of Zr2Cu are moderate in size and amount, shows the best corrosion resistance. However, the Zr-1Nb-0.5Cu alloy, in which the SPPs of Zr2Cu are larger and more, shows the worst corrosion resistance and nodular corrosion appeares during the autoclave tests in superheated steam at 400 ℃.