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Effects of minor Zn content on microstructure and corrosion properties of Al−Mg alloy

  • Materials, Metallurgy, Chemical and Environmental Engineering
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Abstract

The effects of different Zn contents in Al−Mg alloy on the microstructure characterizations were observed by advanced electron microscopy and the corrosion properties were investigated by the inter-granular corrosion tests, the exfoliation corrosion tests, and the Potentiodynamic polarizaion tests. The τ phase (Mg32 (Al, Zn)49) forms on the pre-existing Mn-rich particles and at the grain boundaries. According to the theory of binding energy, the formation of τ phase is much easier than that of β phase (Al3Mg2), somehow replacing β phase and reducing the possibility of β phase precipitation. This change dramatically decreases the susceptibility of corrosion. The Zn addition increases the corrosion resistance of Al−Mg alloy with an optimal value of 0.31%. When the Zn addition is increased to 0.78%, however, the corrosion resistance of alloy decreases once again but it is still better than that of the alloy without Zn addition.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Central South University, Changsha, 410083, China

    Jing-wei Zhao  (赵经纬), Bing-hui Luo  (罗兵辉), Zhen-hai Bai  (柏振海), Bin Li  (李彬) & Wei Chen  (陈维)

  2. Advanced Research Centre, Central South University, Changsha, 410083, China

    Ke-jian He  (何克坚)

Authors
  1. Jing-wei Zhao  (赵经纬)
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  2. Bing-hui Luo  (罗兵辉)
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  3. Ke-jian He  (何克坚)
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  4. Zhen-hai Bai  (柏振海)
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  5. Bin Li  (李彬)
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  6. Wei Chen  (陈维)
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Correspondence to Bing-hui Luo  (罗兵辉).

Additional information

Foundation item: Project(2011-006) supported by the State Administration of Science, Technology and Industry for National Defence, China

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Zhao, Jw., Luo, Bh., He, Kj. et al. Effects of minor Zn content on microstructure and corrosion properties of Al−Mg alloy. J. Cent. South Univ. 23, 3051–3059 (2016). https://doi.org/10.1007/s11771-016-3368-6

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  • DOI: https://doi.org/10.1007/s11771-016-3368-6

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