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The Role of Nd in Corrosion Properties of Mg-12Gd-2Zn-0.4Zr Alloys

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Abstract

To reveal the effect of Nd addition on corrosion properties of Mg-Gd-Zn-Zr alloys, the corrosion behavior of the as-cast Mg-12Gd-2Zn-xNd-0.4Zr (x = 0, 0.5, and 1 wt.%) alloys was investigated by using immersion and electrochemical measurements. The results show that the addition of Nd apparently refines and homogenizes the microstructure of the alloys. The corrosion resistance of the three alloys is improved in the initial 24 h corrosion process with increasing Nd addition according to hydrogen evolution results, later followed by an acceleration of corrosion with prolonging immersion time. During the 60 h immersion tests, the alloy without the addition of Nd exhibits the best corrosion resistance and the alloy with 0.5 wt.% Nd shows the highest corrosion rate, which are consistent with the electrochemical test results. The refined microstructure and increased fraction of the eutectic phase compromise the corrosion resistance of the alloys with Nd addition.

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Acknowledgments

This project was supported by the National Natural Science Foundation of China (52071175), the Natural Science Foundation of Higher Education Institutions of Jiangsu Province - Key Project (18KJA430008), and the Key Research & Development Plan (Social Development) of Jiangsu Province (BE2020702).

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  1. School of Materials Science and Engineering, Nan**g Institute of Technology, Nan**g, 211167, China

    Lixin Hong, Rongxiang Wang & **aobo Zhang

  2. Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology, Nan**g, 211167, China

    Lixin Hong, Rongxiang Wang & **aobo Zhang

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  1. Lixin Hong
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Hong, L., Wang, R. & Zhang, X. The Role of Nd in Corrosion Properties of Mg-12Gd-2Zn-0.4Zr Alloys. J. of Materi Eng and Perform 30, 6000–6008 (2021). https://doi.org/10.1007/s11665-021-05782-5

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