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Corrosion Resistance of Zr-1Nb-xGe Alloys in Superheated Steam at 400 ℃ |
ZHANG Jinlong1, 2, TU Liming1, 2, XIE Xingfei1, 2, YAO Meiyi1, 2, ZHOU Bangxin1, 2 |
1. Laboratory for Microstructures, Shanghai University, Shanghai 200444, China; 2. Institute of Materials, Shanghai University, Shanghai 200072, China |
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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 scales 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 may be enhanced 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 solubility of Ge in the α-Zr matrix of Zr-1Nb alloy is 0.05%~0.1%. It is noted that the Ge solid soluted in the α-Zr matrix can effectively slow down the microstructural evolution of oxide scale, thereby enhancing the corrosion resistance of the alloy. When the Ge content exceeds its 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.
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Received: 21 May 2013
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