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Microstructural Characteristics of Oxide Films Grown on Zr–0.7Sn–1Nb–0.03Fe–0.2Ge Alloy Corroded in Lithiated Water at 360 °C

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Abstract

The corrosion resistance of a Zr–0.7Sn–1Nb–0.03Fe–0.2Ge (wt%) alloy was investigated by autoclave test in lithiated water with 0.01 M LiOH at 360 °C under a pressure of 18.6 MPa. The microstructure of the oxide film which formed was examined by TEM and SEM. The results revealed that there were a few micro-cracks and more ZrO2 columnar grains in the oxide film formed after exposure for 190 days. The oxidation of second-phase particles (SPPs) was slower than that of α-Zr matrix. The c-ZrO2 was observed around the [Zr–Nb–Fe–Cr–Ge]O SPPs. The amorphous phase produced around the [Zr–Nb–Fe–Cr–Ge]O SPPs could relax the stress in the oxide film. The addition of Ge can reduce micro-pores and micro-cracks formed in oxide film, and delay the microstructural evolution from columnar grains to equiaxed grains. Therefore, the addition of Ge can improve the corrosion resistance of the Zr–0.7Sn–1Nb–0.03Fe alloy.

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Acknowledgments

The authors would like to thank Mr. Weijun Yu, Mr. Yuliang Chu, Mr. Xue Liang and Dr. Pengfei Hu for their helping in the microstructure analysis. This study is partly supported by National Natural Science Foundation of China (No. 51171102) and National Advanced Pressurized Water Reactor Project of China (No. 2011ZX06004-023).

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Authors and Affiliations

  1. Laboratory for Microstructures, Shanghai University, Shanghai, 200444, People’s Republic of China

    Jinlong Zhang, Xingfei Xie, Meiyi Yao, Bangxin Zhou & Jianchao Peng

  2. Institute of Materials, Shanghai University, Shanghai, 200072, People’s Republic of China

    Jinlong Zhang, Xingfei Xie, Meiyi Yao, Bangxin Zhou & Jianchao Peng

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  1. Jinlong Zhang
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  2. Xingfei Xie
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Correspondence to Jinlong Zhang.

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Zhang, J., Xie, X., Yao, M. et al. Microstructural Characteristics of Oxide Films Grown on Zr–0.7Sn–1Nb–0.03Fe–0.2Ge Alloy Corroded in Lithiated Water at 360 °C. Oxid Met 82, 383–393 (2014). https://doi.org/10.1007/s11085-014-9497-0

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  • DOI: https://doi.org/10.1007/s11085-014-9497-0

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