中文摘要：

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℃，10．3MPa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（2000h）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500-1000h内由近似立方规律向直线规律转变．

英文摘要：

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.