比较了N36(Zr-1Sn-1Nb-0.3Fe)及低锡N36 (Zr-0.8Sn-1Nb-0.3Fe)锆合金样品在360℃/18.6 MPa/0.03 mol/LLiOH水溶液中的耐腐蚀性能,发现N36提前发生腐蚀转折,转折后腐蚀增重远高于低锡N36.观察了腐蚀转折后合金样品氧化膜形貌及物相特征,发现在氧化膜断面上形成平行于氧化膜/金属界面的裂纹,而界面氧化膜呈“菜花”状生长；与N36相比,低锡N36氧化膜形貌显示断面裂纹相对较少,界面生长的氧化膜较为平整；随腐蚀速率的增加,断面裂纹增多,界面膜呈“菜花”状凸起越严重；氧化膜中产生的裂纹与四方相的转变有关.讨论了Sn对N36合金耐腐蚀性能影响的机理,认为固溶在α-Zr中的Sn含量是引起耐腐蚀性能差别的主要原因.
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