Microstructure refinement is known to have a significant effect on the electrochemical properties of the metallic alloys. The current research investigated the electrochemical properties of Zn–0.5 wt% Al alloy as influenced by the microstructure changes due to Mg addition. Magnesium was added as alloying element during the melting process in amounts that ranged between 0.1 and 0.9 wt%. Some specimens (0.2, 0.5, 0.7, 0.8, 0.9 wt% Mg) with obvious microstructure changes were selected to evaluate their electrochemical properties. The samples were immersed in 3.5% NaCl solution for 3, 8 and 30 days, and the corrosion rate was then calculated based on the weight loss after removing the corrosion products. Polarization tests were also performed, and both of Tafel curves and impedance circles were recorded. It was observed that Mg additions refined Zn dendrites and significantly reduced their size from 165 μm without Mg down to 20 μm with 0.7 wt% Mg where the dendritic morphology changed to the polygonal shape. However, the dendritic morphology was retained with further increase in Mg content. As a result of microstructure refinement and the observed uniform distribution of Al in the interdendritic regions with Mg addition, the corrosion resistance of (Zn–0.5Al) alloy increased and the corrosion rate was reduced from (~ 0.00099 mm/year) without Mg down to (~ 0.0005 mm/year) at 0.7 wt% Mg. Increasing the amount of Mg to 0.8 wt% raised the corrosion rate to (~ 0.0015 mm/year) and affected negatively the corrosion resistance of the alloy.

已知微观结构细化对金属合金的电化学性能具有显着影响。目前的研究调查了 Zn-0.5 wt% Al 合金的电化学性能，其受由于添加 Mg 引起的微观结构变化的影响。镁作为合金元素在熔化过程中以 0.1 至 0.9 重量％的范围添加。选择了一些具有明显微观结构变化的试样（0.2、0.5、0.7、0.8、0.9 wt% Mg）来评估它们的电化学性能。将样品在 3.5% NaCl 溶液中浸泡 3、8 和 30 天，然后根据去除腐蚀产物后的重量损失计算腐蚀速率。还进行了极化测试，并记录了 Tafel 曲线和阻抗圆。观察到 Mg 的添加细化了 Zn 枝晶，并将它们的尺寸从没有 Mg 的 165 μm 显着减小到含有 0.7 wt% Mg 的 20 μm，其中枝晶形态变为多边形。然而，随着镁含量的进一步增加，枝晶形态得以保留。由于微观结构的细化和观察到的铝在枝晶间区域的均匀分布，添加了镁，（Zn-0.5Al）合金的耐腐蚀性能增加，腐蚀速率从（~0.00099 毫米/年）降低，没有镁下降到（~ 0.0005 毫米/年）在 0.7 wt% Mg。将 Mg 的量增加到 0.8 wt% 将腐蚀速率提高到 (~ 0.0015 mm/year) 并对合金的耐腐蚀性产生负面影响。7 wt% Mg，其中枝晶形态变为多边形。然而，随着镁含量的进一步增加，枝晶形态得以保留。由于微观结构的细化和观察到的铝在枝晶间区域的均匀分布，添加了镁，（Zn-0.5Al）合金的耐腐蚀性能增加，腐蚀速率从（~0.00099 毫米/年）降低，没有镁下降到（~ 0.0005 毫米/年）在 0.7 wt% Mg。将 Mg 的量增加到 0.8 wt% 将腐蚀速率提高到 (~ 0.0015 mm/year) 并对合金的耐腐蚀性产生负面影响。7 wt% Mg，其中枝晶形态变为多边形。然而，随着镁含量的进一步增加，枝晶形态得以保留。由于微观结构的细化和观察到的铝在枝晶间区域的均匀分布，添加了镁，（Zn-0.5Al）合金的耐腐蚀性能增加，腐蚀速率从（~0.00099 毫米/年）降低，没有镁下降到（~ 0.0005 毫米/年）在 0.7 wt% Mg。将 Mg 的量增加到 0.8 wt% 将腐蚀速率提高到 (~ 0.0015 mm/year) 并对合金的耐腐蚀性产生负面影响。由于微观结构的细化和观察到的铝在枝晶间区域的均匀分布，添加了镁，（Zn-0.5Al）合金的耐腐蚀性能增加，腐蚀速率从（~0.00099 毫米/年）降低，没有镁下降到（~ 0.0005 毫米/年）在 0.7 wt% Mg。将 Mg 的量增加到 0.8 wt% 将腐蚀速率提高到 (~ 0.0015 mm/year) 并对合金的耐腐蚀性产生负面影响。由于微观结构的细化和观察到的铝在枝晶间区域的均匀分布，添加了镁，（Zn-0.5Al）合金的耐腐蚀性能增加，腐蚀速率从（~0.00099 毫米/年）降低，没有镁下降到（~ 0.0005 毫米/年）在 0.7 wt% Mg。将 Mg 的量增加到 0.8 wt% 将腐蚀速率提高到 (~ 0.0015 mm/year) 并对合金的耐腐蚀性产生负面影响。