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金属学报  2013 

Zr-1Nb-0.7Sn-0.03Fe-xGe合金在360℃LiOH水溶液中耐腐蚀性能的研究

DOI: 10.3724/SP.J.1037.2012.00638, PP. 443-450

Keywords: 锆合金,Ge,耐腐蚀性能,显微组织,氧化膜

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Abstract:

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℃,18.6MPa和0.01mol/LLiOH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℃,18.6MPa和0.01mol/LLiOH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190d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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