Ag含量对Zn-Mg-Ag合金组织和性能的影响

采用粉末冶金法制备Zn-Mg-Ag合金，研究Ag含量对合金显微组织、抗压强度、耐腐蚀性能和抗菌性能的影响。结果表明，当Ag质量分数从0.5%增加2.0%时，Zn-Mg-Ag三元合金中MgZn2相含量增加，烧结密度降低，抗压强度先提高而后降低。随Ag含量增加，合金自腐蚀电位略有降低，但是维钝电流密度明显增高，表现出较大的降解速率和失重；在人工模拟体液中腐蚀浸泡14天后，合金表面有明显的腐蚀坑存在。当Ag质量分数从0.5%增加2.0%时，合金对金黄色葡萄球菌和大肠杆菌的抑菌圈直径分别增加15.0和5.8 mm，抗菌效果提高。

Effect of Ag contents on microstructure and properties of Zn-Mg-Ag alloys

In this study, Zn-Mg-Ag alloys were prepared by powder metallurgy method. The effect of Ag contents on microstructure, compressive strength, corrosion resistance and antibacterial properties of Zn-Mg-Ag alloys were studied. The results show the contents of MgZn2 phase increase, sintering density decreases and compressive strength first increases and then decreases after the addition of Ag element from 0.5% to 2.0%. By increasing the Ag contents, the self-corrosion potentials of the Zn-Mg-Ag alloys decrease slightly, but the passivation current density, corrosion rate and weight loss significantly increase. After immersed in the artificial simulated body fluid for 14 days, obvious corrosion pits appear on the surface of the Zn-Mg-Ag alloys. The diameter of inhibition ring of Zn-Mg-Ag alloy for Staphylococcus aureus and Escherichia coli has increase of 15.0 and 5.8 mm when changing Ag contents from 0.5% to 2.0%. The antibacterial effect of Zn-Mg-Ag alloys are improved.