中文摘要：

描述了用单片试样法研究合金成分对Zr．Sn．Nb．Fe．Cr系锆合金在350℃，LiOH水溶液和400℃蒸汽中耐腐蚀性能影响的结果。这种单片试样，类似于成分梯度材料，是用真空电子束焊接方法将成分不同的锆合金小条交替焊接而成。研究结果表明：在合金成分最优化的地方，经400℃过热蒸汽腐蚀120d的增重与Zr-4相当；而经350℃，LiOH水溶液中腐蚀110d后，耐腐蚀性能优于Zr-4，也略优于ZIRLO，E635等Zr-Sn-Nb-Fe系合金，与N18的耐腐蚀性能相当。这种合金的成分为Zr-1．1-1．4Sn-0．2-0．3Nb-0．12-0．2Fe-0．02～0．03Cr。在LiOH水溶液中腐蚀时，成分对锆合金耐腐蚀性能影响的规律显得更为复杂，合金成分的微小变化就可能引起耐腐蚀性能的明显差别，这或许还包含着合金元素过饱和固溶在α-Zr中产生的影响。用单片试样法研究成分对锆合金耐腐蚀性能的影响可以得到非常丰富的信息，便于发现耐腐蚀性能更优良的新锆合金。

英文摘要：

The effect of alloying composition on the corrosion resistance of zirconium alloys with Zr-Sn-Nb-Fe-Cr system tested in 350℃, LiOH solution and 400℃ steam was investigated using Single-Specimen-Method. The Single-Specimen with composition gradient was prepared using zirconium alloy strips with different compositions by vacuum electron beam welding alternately. Experimental results show that, tested in 400℃ steam for 110 days, the corrosion resistance of the zirconium alloy with optimum composition is comparable to that of Zr-4, and tested in LiOH solution for 120 days, it is superior to that of Zr-4, E635 and ZIRLO alloys, and is comparable to that of Nl8 alloy The optimum composition is Zr-1.1-1.4Sn-0.2-0.3Nb-0.12-0.2Fe-0.02-0.03Cr. Moreover, tested in LiOH solution, a slight variation of composition may result in significant difference in corrosion resistance. This shows that the effect of alloying composition on the corrosion behavior of zirconium alloys tested in LiOH solution is relatively complicated. At the same time, the effect of different supersaturated solid solution of alloy elements in α-Zr maybe also involved. Abundant information can be obtained by Single-Specimen-Method for investigation of the effect of alloying composition on the corrosion resistance of zirconium alloys. Such method might be helpful to find new zirconium alloys with excellent corrosion resistance.