Zr－Nb系合金耐蚀性能研究

The Corrosion Behaviour of Zirconium-Niobum Alloys

结合核动力堆用燃料包壳对锆合金耐蚀性能的要求，大范围考察了Ｎｂ含量为０．５％，１．０％，２．６％（ｗｔ％）的Ｚｒ—Ｎｂ二元合金及含Ｃｒ、Ｍｏ、Ｓｎ、Ｂｉ、Ｆｅ、Ｃｅ和Ｓｉ的Ｚｒ－１Ｎｂ及多元合金，共１７种成分的Ｚｒ－Ｎｂ系合金在４００℃，１０．３ＭＰａ水蒸汽中的长期腐蚀规律（达１８２天）。在腐蚀转折前，Ｚｒ－Ｎｂ系合金的腐蚀动力学曲线均近似于抛物线规律，而在转折之后存在与线性规律偏离现象。长期腐蚀增重的分析说明：通过合理的多元合金化，即增加或降低Ｎｂ含量，并主加Ｆｅ、Ｂｉ、Ｓｎ和Ｎｉ而辅加少量的Ｃｒ、Ｍｏ、Ｔｅ和Ｓｉ，Ｚｒ－１Ｎｂ合金的耐蚀性大有潜力可挖。

ased on the requirement of corrosion resistance of Zirconium alloys for fuel cladding in nuclear reactors,the long term corrosion behaviour of Zr-Nb binary alloys containing 0.5,1.0 and 2.6Wt% Nb and Zr-1 Nb alloys with Cr,Mo,Sn,Bi,Fe,Te,Ce and Si additives have been examined in 400℃,10.3 MPa Steam.The kinetic curves of all Zr-Nb alloys are close to parabolical law before break-away corrosion.Diviations from linear law are also found in some alloys after break-away cormsion.Analysis of long term corrosion weight gain shows that the corrosion resistance of Zr-1 Nb alloy may be greatly improved by rationally alloying,e·g·increasing or decreasing the content of Nb and adding Fe,Bi,Sn and Ni with the supplement of a little Cr,Mo,Te,and Si.