摘要
采用水热法合成了Mg-MOF-74粉末,通过化学转化法及浸涂法在AZ31B镁合金表面制备了MgF_(2)/Mg-MOF-74@壳聚糖复合涂层。采用X射线衍射和扫描电镜分析了Mg-MOF-74粉末及复合涂层的微观结构和表面形貌;通过电化学实验以及析氢实验等方法探究了复合涂层的耐腐蚀性;通过抗菌实验测试了复合涂层的抗菌性能。实验结果表明:相比于MgF_(2)/壳聚糖涂层镁合金,由于Mg-MOF-74粉末的掺杂,MgF_(2)/Mg-MOF-74@壳聚糖复合涂层镁合金的两个容抗弧曲率半径均明显增大,腐蚀电流降低了1个数量级,腐蚀电位增加了0.131 V,在模拟体液中浸泡7 d后的析氢量也相对减少约一半,改善了镁合金的耐腐蚀性能;MgF_(2)/Mg-MOF-74@壳聚糖涂层镁合金相比MgF_(2)/壳聚糖涂层镁合金,抗菌率从78%提高到94%,说明Mg-MOF-74粉末能进一步提高镁合金的抗菌性能。
Mg-MOF-74 powder was synthesized by hydrothermal method,and MgF_(2)/Mg-MOF-74@chitosan composite coating was prepared on the surface of AZ31B magnesium alloy by chemical conversion and dipping method.The microstructure and surface morphology of Mg-MOF-74 powder and composite coating were analyzed by X-ray diffraction and scanning electron microscopy.The corrosion resistance of composite coatings was explored by electrochemical experiments and hydrogen evolution experiments.The antibacterial properties of the composite coating were tested by antimicrobial experiments.The experimental results show that compared with MgF_(2)/chitosan-coated magnesium alloy,due to the doping of Mg-MOF-74 powder,the two capacitive arc radii of MgF_(2)/Mg-MOF-74@chitosan composite coated magnesium alloy are significantly increased,the corrosion current is reduced by 1 order of magnitude,the corrosion potential is increased by 0.131 V,and the amount of hydrogen evolution after immersion in the simulated body fluid for 7 d is relatively reduced by about 50%,which has a better effect on the corrosion resistance of the magnesium alloy.Compared with MgF_(2)/chitosan-coated magnesium alloy,the antibacterial rate of MgF_(2)/Mg-MOF-74@chitosan-coated magnesium alloy increased from 78%to 94%,indicating that the addition of Mg-MOF-74 powder can further improve the antibacterial performance of magnesium alloy.
作者
纪茜
刘伟
肖天铸
李耀辉
Ji Qian;Liu Wei;Xiao Tianzhu;Li Yaohui(School of Mechanical and Electrical Engineering,Henan University of Technology,Zhengzhou 450001,China)
出处
《电镀与精饰》
CAS
北大核心
2023年第11期32-39,共8页
Plating & Finishing
基金
国家自然科学基金(U1504504)
河南工业大学自科创新基金(2020ZKCJ28)。
关键词
医用镁合金
金属有机骨架材料
壳聚糖
耐腐蚀性
抗菌性
medical magnesium alloy
metal organic framework materials
chitosan,corrosion resistance
antimicrobial property
