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Effect of heat treatment on the microstructure and corrosion behaviour of Mg–Zn alloys

Authors

  • H. R. Bakhsheshi-Rad,

    Corresponding author
    1. Faculty of Mechanical Engineering, Department of Materials, Manufacturing and Industrial Engineering, Universiti Teknologi Malaysia, Johor Bahru, Johor, (Malaysia)
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  • E. Hamzah,

    1. Faculty of Mechanical Engineering, Department of Materials, Manufacturing and Industrial Engineering, Universiti Teknologi Malaysia, Johor Bahru, Johor, (Malaysia)
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  • M. Medraj,

    1. Department of Mechanical Engineering, Concordia University, Montreal, (Canada)
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  • M. H. Idris,

    1. Faculty of Mechanical Engineering, Department of Materials, Manufacturing and Industrial Engineering, Universiti Teknologi Malaysia, Johor Bahru, Johor, (Malaysia)
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  • A. F. Lotfabadi,

    1. Faculty of Mechanical Engineering, Department of Materials, Manufacturing and Industrial Engineering, Universiti Teknologi Malaysia, Johor Bahru, Johor, (Malaysia)
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  • M. Daroonparvar,

    1. Faculty of Mechanical Engineering, Department of Materials, Manufacturing and Industrial Engineering, Universiti Teknologi Malaysia, Johor Bahru, Johor, (Malaysia)
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  • M. A. M. Yajid

    1. Faculty of Mechanical Engineering, Department of Materials, Manufacturing and Industrial Engineering, Universiti Teknologi Malaysia, Johor Bahru, Johor, (Malaysia)
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Abstract

Microstructure and corrosion behaviour in simulated body fluid of as-cast and heat treated Mg–xZn (x = 3 and 6) alloys for different heat treatment times were studied. The results revealed that as-cast Mg–3Zn alloys consist of Mg12Zn13 phase and α-Mg matrix, while Mg–6Zn is composed of Mg51Zn20, Mg12Zn13 compounds and α-Mg matrix. After heat treatment of Mg–6Zn alloy at 340 °C, the Mg51Zn20 phase decomposed to the matrix and Mg12Zn13 while, the microstructure of Mg–3Zn remained unchanged. The results also indicated that heat treatment at 340 °C has little influence on the corrosion behaviour of Mg–3Zn. In contrast, heat treatment improved the corrosion resistance of the Mg–6Zn alloy as the decomposition of the Mg51Zn20 phase decreased micro-galvanic corrosion. The corrosion resistance of both as-cast Mg–3Zn and Mg–6Zn alloys marginally improved with increasing heat treatment times.

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