《Table 1 Chemical compositions of Mg-Al-Pb (A) and Mg-Al-Pb-Zn (B) alloys/mass fraction》

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《Mg-Al-Pb及Mg-Al-Pb-Zn合金在3.5% NaCl溶液中的腐蚀行为（英文）》

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Mg-Al-Pb（denoted as A）and Mg-Al-Pb-Zn（denoted as B）alloys with nominal compositions of6%Al，5%Pb，1%Zn（mass fraction）and balance Mg were prepared from ingots of pure magnesium（99.99%），pure aluminum（99.99%），pure lead（99.99%）and pure zinc（99.99%）by induction melting at 750℃with argon protection.The chemical compositions determined by the atomic absorption spectrometry are listed in Table 1.Solution treatments（T4）were carried out at 400℃for 24 hin argon atmosphere followed by water quench.The fraction of argon was 0.1 m3/h.The as-cast and T4treated specimens were successively ground to 1200grit by SiC paper，polished using 0.5μm diamond paste，ultrasonically cleaned in acetone，and finally dried in cold air.The metallographic specimen was etched with 1%natal solution（HNO3in ethanol）.The microstructure was examined by optical microscopy.The phase structure was measured by D/Max 2550 X-ray diffraction（XRD）with Cu Kαradiation.The scan rang of 2θwas from10°to 80°at a scan rate of 2（°）/min.