AZ31B镁合金表面Mg–Cu-MOF涂层的制备及性能

Preparation and properties of Mg–Cu-MOF coating on AZ31B magnesium alloy

通过水热合成法在AZ31B镁合金表面原位生成了Mg–Cu-MOF-74双金属有机骨架涂层。采用扫描电镜(SEM)、能谱(EDS)及X射线衍射(XRD)分析了涂层的表面形貌和组织结构,通过水接触角测量、电化学测试及抗菌试验研究了涂层的亲水性、耐蚀性和抗菌性。结果表明,相比于Mg-MOF-74涂层,Mg–Cu-MOF-74涂层的结构更致密,水接触角更高,耐蚀性更好。这说明Cu元素的掺杂能够在保持涂层较好亲水性的同时,有效提高其耐蚀性。Mg-MOF-74涂层和Mg–Cu-MOF-74涂层的抗菌率分别为90%和99%,说明Cu元素的掺杂有利于提高涂层的抗菌能力。

A Mg–Cu-MOF-74 bimetal–organic framework coating was prepared in-situ on AZ31B magnesium alloy by hydrothermal synthesis. The surface morphology and microstructure of the coating were analyzed by scanning electron microscopy(SEM), energy-dispersive spectroscopy(EDS), and X-ray diffraction(XRD). The hydrophilicity, corrosion resistance, and antibacterial property of the coating were studied through water contact angle measurement, electrochemical test, and antibacterial test, respectively. The results showed that Mg–Cu-MOF-74 coating had more compact structure, higher water contact angle, and better corrosion resistance as compared with Mg-MOF-74 coating, indicating that the doping of Cu can effectively improve the corrosion resistance of the coating while maintain its good hydrophilicity. The antibacterial efficiency was 90% for Mg-MOF-74 coating and 99% for Mg–Cu-MOF-74 coating, indicating that the doping of Cu is also beneficial to improving the antibacterial property of the coating.