对添加微量合金元素Ge的Zr-1Nb-0.7Sn-0.03Fe-xGe (x=0,0.05,0.1,0.2,质量分数,％)合金在360℃,18.6 MPa和0.01 mol/L LiOH水溶液中进行静态高压釜腐蚀实验.利用TEM和SEM研究了合金和氧化膜的显微组织.结果表明:添加适量Ge可以显著提高Zr-1Nb-0.7Sn-0.03Fe合金在360℃,18.6 MPa和0.01 mol/L LiOH水溶液中的耐腐蚀性能；在Zr-1Nb-0.7Sn-0.03Fe-xGe合金中,除了存在bcc结构的β-Nb型第二相和四方结构的Zr-Nb-Fe-Cr第二相,还存在四方结构的Zr-Nb-Fe-Cr-Ge和四方结构的Zr3Ge型第二相；这些第二相的氧化速率比α-Zr基体慢.腐蚀190 d后,Zr-1Nb-0.7Sn-0.03Fe-0.1Ge合金氧化膜中微裂纹较少,并且存在较多的Zr2O柱状晶；添加Ge既可以有效延缓氧化膜中的缺陷形成微孔隙和微裂纹的过程,又可以延迟Zr2O柱状晶向等轴晶的演化,因而可以提高合金的耐腐蚀性能.
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