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Sn含量对Zr-Sn-Nb合金在蒸汽中腐蚀性能的影响

Effect of Sn Content on Corrosion Resistance of Zr-Sn-Nb Alloys in Steam

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【作者】 杨忠波赵文金苗志陈亮

【Author】 YANG Zhong-bo,ZHAO Wen-jin,MIAO Zhi,CHEN Liang Science and Technology on Reactor Fuel and Materials Laboratory,Nuclear Power Institute of China,Chengdu,610041,China

【机构】 中国核动力研究设计院反应堆燃料及材料重点实验室

【摘要】 研究了同Sn含量质量分数的Zr-xSn-1Nb-0.3Fe(x=0%~1.5%)合金在400℃/10.3 MPa过热蒸汽中的耐腐蚀性能。270 d腐蚀结果表明:Sn质量分数从1.5%降低至0.8%时,合金试样腐蚀增重明显降低,进一步降低Sn含量对合金的耐腐蚀性能没有明显的影响;采用金相显微镜(OM)和扫描电镜(SEM)分别表征合金试样的晶粒组织及第二相大小分布时发现,一定量的Sn可以使合金的再结晶程度增加,合金试样中第二相的面密度随着Sn含量的增加而减少,Sn对第二相的析出具有抑制作用;X射线衍射仪(XRD)分析表明,腐蚀增重较低的合金试样氧化膜中的t-ZrO2分数较多,氧化膜中存在的四方相对合金的抗腐蚀性能有利。

【Abstract】 The corrosion behaviors of Zr-xSn-1Nb-0.3Fe(x=0~1.5wt%) alloys have been investigated in the superheated steam of 400℃/10.3 MPa for 270 days.Results show that the corrosion weight distinctly de-creased with the decreasing of Sn content from 1.5wt% to 0.8wt%.However,the corrosion weight was hardly changed when the Sn content was 0 ~ 0.8wt%.The characteristics of grains and second phase particles were analyzed by optical microscope(OM) and scanning electron microscope(SEM),respectively,and the crystal structure of oxide films formed on specimens after corrosion test were characterized by X-ray diffraction(XRD) method.The microstructural characteristics indicated that some Sn promoted the recrystallization of Zr-1Nb-0.3Fe alloy,and the area fraction of precipitates in the alloy was increased with the Sn content de-creased when all the samples were the same heat treatment condition.It was found that,the higher the fraction of the tetragonal ZrO2 in the oxide films was,the lower the corrosion rate of specimens,and it can be con-cluded that the tetragonal ZrO2 in the oxide films makes for the corrosion resistance.

【关键词】 锆合金腐蚀显微组织氧化膜
【Key words】 Zirconium alloysCorrosionMicrostructureOxide films
  • 【文献出处】 核动力工程 ,Nuclear Power Engineering , 编辑部邮箱 ,2012年S2期
  • 【分类号】TG146.414
  • 【被引频次】2
  • 【下载频次】91
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