17Al12 phase. Moreover, the content of beta phase increases with the increase of Al content. As a result, the corrosion resistance of the three alloys was enhanced with the increase of the β phase. The Mg-15%Al alloy has the best corrosion resistance, and Mg-9%Al is the worst. The oxide film formed on the all as cast Mg-Al alloys surface after hydrogen evolution testing for 72 h in 3.5 wt.% NaCl. Furthermore, the stability of the film increased with the increase of Al content."/>

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Investigation on the microstructure and corrosion behavior of the as-cast Mg-xAl(x=9, 12, 15) alloys
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College of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan,Shanxi,College of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan,Shanxi,College of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan,Shanxi,College of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan,Shanxi,College of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan,Shanxi,College of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan,Shanxi,College of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan,Shanxi

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TG146.22

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    Abstract:

    The Mg-xAl(x=9, 12, 15) alloys were prepared by meaning of semi-continuous casting. The effects of Al contents on evolution of microstructure of Mg-Al alloy were investigated used X-ray diffraction(XRD), optical microscopy(OM) and scanning electron microscopy(SEM). Meanwhile, the corrosion behaviors of Mg-xAl(x=9, 12, 15) alloys were studied by both hydrogen evolution and Potentiodynamic polarization curves. Moreover, the corrosion mechanism of Mg-xAl(x=9, 12, 15) alloys was also discussed in details based on the SEM corrosion morphologies of as-cast Mg-Al alloys after hydrogen evolution testing for 72 h in 3.5 wt.% NaCl without corrosion products. The results indicated that the microstructure of three alloys is composed of α-Mg phase and β-Mg17Al12 phase. Moreover, the content of beta phase increases with the increase of Al content. As a result, the corrosion resistance of the three alloys was enhanced with the increase of the β phase. The Mg-15%Al alloy has the best corrosion resistance, and Mg-9%Al is the worst. The oxide film formed on the all as cast Mg-Al alloys surface after hydrogen evolution testing for 72 h in 3.5 wt.% NaCl. Furthermore, the stability of the film increased with the increase of Al content.

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[Guo Yanping, Wang Yaning, Wang Quanle, Wang lin, Dong Zhaobo, Fang Daqing, Liu Baosheng. Investigation on the microstructure and corrosion behavior of the as-cast Mg-xAl(x=9, 12, 15) alloys[J]. Rare Metal Materials and Engineering,2018,47(8):2531~2536.]
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History
  • Received:August 18,2017
  • Revised:October 18,2017
  • Adopted:November 22,2017
  • Online: October 17,2018
  • Published: