The effect of eutectic structure and long period stacking ordered (LPSO) structure on the corrosion resistance of Mg 95.5 Gd 3.5 Zn 1 alloy has been investigated. The eutectic structure and LPSO phase were obtained by different heat treatments and their corrosion behavior and microstructures were examined by immersion test, electrochemical measurement, and SEM. It is suggested that the Mg 95.5 Gd 3.5 Zn 1 alloy containing LPSO phase has a better corrosion resistance than that without LPSO phase. This is due to the smaller accelerating corrosion effect, which is caused by the contact between a-Mg and LPSO phase. Figure 4. Cross-sectional SEM images of corroded surface after immersed in 0.17 M NaCl solution for 18 h: (a) aged Mg 95.5 Gd 3.5 Zn 1 alloy with LPSO phase and (b) as-cast Mg 95.5 Gd 3.5 Zn 1 alloy with eutectic structureFigure 5. Polarization curves of the as-cast and aged Mg 95.5 Gd 3.5 Zn 1 alloys in 0.17 M NaCl solution at room temperature www.matcorr.com

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