Zr-0.4Fe-1.0Cr-xMo合金在500℃和10.3 MPa水蒸汽中的腐蚀行为  

CORROSION BEHAVIOR OF Zr-0.4Fe-1.0Cr-xMo ALLOYS IN 500℃and 10.3 MPa STEAM

作　　者：韦天国[1] 龙冲生[1] 苗志[1] 刘云明[1] 栾佰峰[2] 

机构地区：[1]中国核动力研究设计院反应堆燃料及材料重点实验室,成都610041 [2]重庆大学材料科学与工程学院,重庆400044

出　　处：《金属学报》2013年第6期717-724,共8页Acta Metallurgica Sinica

基　　金：国家自然科学基金资助项目51171175~~

摘　　要：采用真空非自耗电弧熔炼方法制备了4种不同Mo含量的Zr-0.4Fe-1.0Cr-xMo(x=0,0.2,0.4,0.6,质量分数,%)合金材料,研究了其在500℃,10.3 MPa过热水蒸汽中的耐腐蚀性能以及添加Mo对合金耐腐蚀性能的影响.结果表明,Zr-0.4Fe-1.0Cr-xMo合金中含有大量细小的第二相粒子,其腐蚀速率远远低于Zr-4,N18和M5合金.Mo的添加促进了氧化膜生长过程中的演变,降低了耐腐蚀性能.不含Mo合金的氧化膜生长动力学在整个腐蚀周期(2000 h)内一直保持近似立方规律,而含Mo合金的氧化膜生长动力学在500-1000 h内由近似立方规律向直线规律转变.The possibility of using Mo as an alloying element in zirconium alloys was considered in terms of its strengthening effect and microstructure refinement effect. However, the impact of Mo addition on the corrosion resistance was not fully understood. In this work, Zr-0.4Fe-1.0Cr-xMo （x=0, 0.2, 0.4, 0.6, mass fraction, %） alloys with addition of different Mo contents were prepared by vacuum arc melting method and their corrosion resistance in 500 X2, 10.3 MPa steam was investigated. Compared with Zr-4, N18 and M5 alloys, the corrosion rate of Zr-0.4Fe-l.0Cr-xMo alloys was much lower, which was attributed to the large numbers of fine second phase particles in the matrix. Addition of Mo improved the evolution of the oxide film during growth and resulted in the degradation of corrosion resistance. The growth of the oxides remained cubic kinetics in the whole corrosion period （2000 h） for the Mo free alloy, whereas changed from cubic to linear kinetics after a corrosion time of 500-1000 h for the Mo containing alloys.

关 键 词：锆合金 MO 耐腐蚀性能 第二相粒子 氧化膜 

分 类 号：TG172.82[金属学及工艺—金属表面处理]