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利用高压釜腐蚀实验研究了Zr-1Nb-xGe(x=0,0.05,0.1,0.2,质量分数,%)合金在400℃,10.3 MPa过热蒸汽中的耐腐蚀性能;利用SEM和TEM分别观察了合金和氧化膜的显微组织。结果表明:添加Ge可以改善Zr-1Nb合金的耐腐蚀性能,当Ge含量为0.05%时效果最佳。在Zr-1Nb-xGe合金中存在4种第二相,分别是β-Nb,Zr(Nb,Fe,Cr)2,Zr(Nb,Fe,Cr,Ge)2和尺寸较大的Zr3Ge。Ge在Zr-1Nb合金α-Zr基体中的最大固溶含量在0.05%~0.1%之间,固溶的Ge可以有效延缓氧化膜中显微组织的演化,从而改善合金的耐腐蚀性能;当Ge含量超过合金的固溶含量时,会形成Zr(Nb,Fe,Cr,Ge)2以及尺寸较大的Zr3Ge第二相,Zr3Ge会使耐腐蚀性能降低。
The corrosion resistance of Zr-1Nb-xGe (x = 0,0.05,0.1,0.2, mass fraction,%) alloy in superheated steam at 400 ℃ and 10.3 MPa was studied by autoclave corrosion test. The corrosion resistance of Zr- Alloy and oxide film microstructure. The results show that adding Ge can improve the corrosion resistance of Zr-1Nb alloy, and the best effect is obtained when the content of Ge is 0.05%. There are four kinds of second phases in Zr-1Nb-xGe alloy, which are β-Nb, Zr (Nb, Fe, Cr) 2, Zr (Nb, Fe, Cr, Ge) 2 and larger size Zr3Ge. The maximum content of Ge in the α-Zr matrix of Zr-1Nb alloy is between 0.05% and 0.1%. The dissolved Ge can effectively retard the evolution of the microstructure in the oxide film to improve the corrosion resistance of the alloy. When the content of Ge exceeds the solid solution content of the alloy, Zr (Nb, Fe, Cr, Ge) 2 and the larger second phase of Zr3Ge are formed, and Zr3Ge deteriorates the corrosion resistance.