(江苏科技大学 理学院，镇江 212003)
摘 要: 锆合金腐蚀动力学转变现象对锆合金燃料包壳管的使用寿命起决定性作用，而横向裂纹的产生是发生腐蚀动力学转变现象的主要原因之一。迄今为止，对锆合金氧化膜中横向裂纹产生影响因素仍没有系统的研究。从横向裂纹产生的本质出发，讨论锆合金的基体力学性能、第二相粒子、氧化膜中的四方相氧化锆以及合金元素4个因素对锆合金氧化膜中横向裂纹产生的影响，揭示横向裂纹产生的驱动力以及裂纹形核的原因。同时指出对这4个因素的深入研究，有助于减少氧化膜中横向裂纹的产生，进一步增强锆合金的耐腐蚀性能。
关键字: 锆合金；耐腐蚀性能；氧化锆；合金元素；横向裂纹
（School of Science, Jiangsu University of Science and Technology, Zhenjiang 212003, China）
Abstract:The corrosion kinetics transition phenomenon of zirconium alloys has decisive effect on the service life of nuclear zirconium fuel tubes. The lateral cracks in the oxide of zirconium alloy are the principal cause of corrosion kinetics transition. By far, there is no systematical study on the factors which affecting the production of lateral cracks. Based on the nature of formation of lateral cracks, the influences of mechanical properties of matrix, second phase particles, tetragonal zirconia in oxide and alloying elements on corrosion transition phenomenon were discussed, and the driving force for the formation of lateral cracks and the reasons for nucleation regions of cracks were revealed. It is pointed out that deeply investigate on these four factors could contribute to decrease the production of lateral cracks in oxide and enhance the corrosion resistance of zirconium alloys.
Key words: zirconium alloy; corrosion resistance; zirconia; alloying element; lateral crack
