Objective: This study aimed to determine the effects of copper content on the corrosion resistance of CoCrMoCu alloy and its in vitro antibacterial performance.
Methods: CoCrMoCu specimens with different Cu contents (2%, 3%, 5%, and 7%) were prepared by vacuum melting method. CoCrMo without Cu served as control. The corrosion resistance of the specimens was measured by electrochemistry. The antibacterial effects of the specimens on Staphylococcus aureus and Escherichia coli were analyzed by coating-film method.
Results: Compared with CoCrMo without Cu, the addition of 2%-5% Cu to CoCrMo improved the pitting and uniform corrosion of CoCrMo alloy and decreased the corrosion current density. The antibacterial performance of CoCrMoCu alloy increased with increased Cu content. The antibacterial rate of alloy was 99% when Cu content exceeded 5%.
Conclusions: Cu addition had a statistically significant influence on the corrosion resistance and antibacterial performance of CoCrMoCu. CoCrMoCu has better corrosion resistance and antibacterial performance when Cu content is 5%.
目的 探讨铜含量对钴铬钼铜合金体外抗菌性及耐腐蚀性的影响。方法 真空冶炼法制备4种不同铜含量（质量分数分别为2%、3%、5%、7%）的钴铬钼铜合金试件，不含铜的钴铬钼合金作为对照。采用电化学法测定试件的耐腐蚀性，覆膜法分析试件对金黄色葡萄球菌和大肠埃希菌的抗菌性。结果 与不含铜的钴铬钼合金相比，铜含量为2%~5%时钴铬钼铜合金的自腐蚀电位升高，腐蚀电流密度降低，点蚀电位升高。随着铜含量的增加，合金的杀菌率提高，当铜含量大于5%时，合金的杀菌率高达99%。结论 铜的加入会影响钴铬钼合金的耐腐蚀性和抗菌性，当铜添加量为5%时，钴铬钼铜合金兼具较高的耐腐蚀性和良好的抗菌性。.
Keywords: CoCrMo alloy; antibacterial performance; copper containing alloy; corrosion resistance.