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Effect of Different Scale Precipitates on Corrosion Behavior of Mg–10Gd–3Y–0.4Zr Alloy

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

A large amount of directional and willow-like β′ phase was precipitated in Mg–10Gd–3Y–0.4Zr (GW103K) alloy after solution treatment and subsequently aged treatment (T6). In order to explore the effect of the precipitates on the corrosion behavior of the GW103K alloy, the alloy was subjected to solution treatment (T4) at 773 K for 4 h at first, subsequently aged at 498 K for 193 h (T6). The microstructure evolution of the GW103K alloy after this treatment was investigated by scanning electron microscopy and transmission electron microscopy. The high-angle annular detector dark-field scanning transmission electron microscopy was used to observe the typical corrosion morphologies of the nanoscale precipitation phases (β′) in the T6-treated alloy. The corrosion rate was measured by potentiodynamic polarization test. Combining with the potential measurement results by scanning Kelvin probe force microscopy, the effects of the skeleton-like Mg24(Gd, Y)5 and β′ precipitates on the corrosion behavior of GW103K alloy were explored. The results showed that the corrosion rate of the GW103K alloy in different conditions was ranked as: as-cast alloy> T4-treated alloy> T6-treated alloy, attributing to the fact that the relative potential differences of skeleton-like Mg24(Gd, Y)5 were lower than those of the matrix, therefore Mg24(Gd, Y)5 phase formed micro-galvanic coupling with the matrix and corrosion dissolution occurred. The nanoscale β′ precipitates in T6-treated alloy can retard the cathodic process.

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Acknowledgements

This work was supported financially by the National Natural Science Foundation of China (No. 51531007), the Natural Science Foundation of Inner Mongolia (No. 2016MS0538) and the Research Fund of State Key Laboratory for Marine Corrosion and Protection of Luoyang Ship Material Research Institute (LSMRI) (No. KF160408). The authors are grateful to Dr. Ping Qiu for modification in English.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot, 010051, China

    Shuang Yu & Rui-Ling Jia

  2. School of Materials Science and Engineering, Northeast University, Shenyang, 110819, China

    Tao Zhang & Fu-Hui Wang

  3. State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute (LSMRI), Qingdao, 266101, China

    Shuang Yu, Jian Hou & Hui-Xia Zhang

Authors
  1. Shuang Yu
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  2. Rui-Ling Jia
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  3. Tao Zhang
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  4. Fu-Hui Wang
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  5. Jian Hou
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  6. Hui-Xia Zhang
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Correspondence to Rui-Ling Jia.

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Yu, S., Jia, RL., Zhang, T. et al. Effect of Different Scale Precipitates on Corrosion Behavior of Mg–10Gd–3Y–0.4Zr Alloy. Acta Metall. Sin. (Engl. Lett.) 32, 433–442 (2019). https://doi.org/10.1007/s40195-018-0792-7

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  • DOI: https://doi.org/10.1007/s40195-018-0792-7

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