《Table 1 EIS fitting results of the AZ31 samples measured in neutral 3.5 wt%Na Cl solution》

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《织构对基于Mg-3Al-1Zn合金的镁空气电池性能的影响（英文）》

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Fig.2 shows the optical microscopic images of the RS and CS surfaces.It can be found that the RS and CS surface exhibit an almost identical grain size distribution，with an average grain size of 25.0 and 25.1μm，respectively.Thus，the grain size difference is not responsible for the corrosion and discharge performance difference in this study.Fig.3 displays the EIS plots of the RS and CS surfaces.Both of the plots consist of a capacitive loop at high frequency and a relatively-small capacitive loop at low frequency.The high frequency capacitive loop is resulted from charge transfer and a film effect，and the low frequency capacitive loop is resulted from a mass transport relaxation in the surface layer[17，18].The equivalent circuits of the EIS plots are shown in Fig.4.A constant-phase element representing a shift from an ideal capacitor was used instead of the capacitance itself，for simplicity.In Fig.4，Rs represents the solution resistance，CPEdl represents the electric double layer capacity，Rt represents the charge transfer resistance，CPEf represents the film capacity and Rf represents the film resistance.The EIS fitting results are listed in Table 1.The reciprocal of Rt reflects the corrosion resistance of the RS and CS samples，which is 180.5 and 242.4Ω·cm2，respectively.The results demonstrate that the CS surface has a higher corrosion resistance compared with the RS surface.