利用静态高压釜腐蚀实验研究了 Zr-0.7Sn-0.35Nb-0.3Fe-xGe (x=0.05,0.1,0.2,质量分数,％)系列合金在360℃/18.6 MPa/0.01 mol/L LiOH水溶液中的耐腐蚀性能；利用TEM和SEM分别观察了合金基体的显微组织和氧化膜的显微组织.结果表明:Ge可以显著改善Zr-0.7Sn-0.35Nb-0.3Fe合金在高温高压LiOH水溶液中的耐腐蚀性能,当Ge含量为0.1％时,合金的耐腐蚀性能最佳.在Zr-0.7Sn-0.35Nb-0.3Fe-xGe系列合金中发现尺寸较小的hcp结构的Zr(Fe,Cr,Nb)2型、Zr(Fe,Cr,Nb,Ge)2型第二相和尺寸较大的四方结构的Zr3Ge型第二相.腐蚀220 d的Zr-0.7Sn-0.35Nb-0.3Fe-0.1Ge合金氧化膜致密,厚度较薄,几乎没有微孔隙和微裂纹,ZrO2柱状晶较多.这说明添加适量的Ge不仅可以有效延缓氧化膜中空位扩散凝聚形成微孔隙和微孔隙发展形成微裂纹的过程,还可以延迟ZrO2由柱状晶向等轴晶的演化,从而改善合金的耐腐蚀性能.
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