Zr-1Nb-xGe合金在400℃过热蒸汽中耐腐蚀性能的研究

中国腐蚀与防护学报

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张金龙,屠礼明,谢兴飞,姚美意,周邦新

上海大学

Study On The Corrsion resistance Of Zr-1Nb-xGe alloy In Superheated Steam At 400℃

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摘要: 摘要: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℃/10.3MPa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第二相，和尺寸较大的Zr3Ge第二相. Zr-1Nb-xGe合金α-Zr基体中的最大固溶含量在0.05%---0.1%之间，固溶在α-Zr基体中的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，当添加Ge含量超过合金的固溶含量，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。

Abstract：Abstract：The corrosion resistance of Zr-1Nb-xGe(x=0, 0.05, 0.1, 0.2, mass fraction,%) alloys was investigated in superheated steam at 400 ℃/10.3 MPa by autoclave tests. The microstructures of the alloys and oxide films on the corroded specimens were observed by SEM and TEM. The results show that the corrosion resistance of the Zr-1Nb alloy in superheated steam at 400 ℃/10.3 MPa is improved by Ge addition. The alloy with 0.05% Ge shows the best corrosion resistance. In Zr-1Nb-xGe alloys , there are four types of second phase particles(SPPs), including β-Nb，Zr(Nb,Fe,Cr)2, Zr(Nb,Fe,Cr,Ge)2 and coarse Zr3Ge SPPs, and the maximum solid solution of Ge in α-Zr matrix of Zr-1Nb alloy is 0.05%---0.1%. The results show that Ge solid solution in the α-Zr matrix can effectively slow down the microstructural evolution of oxide film, thereby improving the corrosion resistance of the alloy. When the Ge content is more than the solid solubility, Ge was precipitated as Zr(Nb,Fe,Cr,Ge)2 and Zr3Ge SPPs. The coarse Zr3Ge SPPs will decrease the corrosion resistance of the alloys.

收稿日期: 2013-04-17

基金资助:国家自然科学基金项目;国家先进压水堆重大专项

通讯作者: 张金龙

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张金龙屠礼明谢兴飞姚美意周邦新. Zr-1Nb-xGe合金在400℃过热蒸汽中耐腐蚀性能的研究[J]. 中国腐蚀与防护学报, .

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https://www.amse.org.cn/Jwk3_jss_new/zgfs/CN/Y0/V0/I0/0

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