Cerchier P, Pezzato L, Brunelli K, Dolcet P, Bartolozzi A, Bertani R, Dabalà M
Department of Industrial Engineering, University of Padua, Via Marzolo 9, 35131 Padova, Italy.
Department of Industrial Engineering, University of Padua, Via Marzolo 9, 35131 Padova, Italy.
Mater Sci Eng C Mater Biol Appl. 2017 Jun 1;75:554-564. doi: 10.1016/j.msec.2017.02.084. Epub 2017 Feb 21.
In this work, plasma electrolytic oxidation (PEO) coatings were produced on AA7075 using alkaline solution containing silicates compounds and silver micrometric particles in order to give to the coating an antimicrobial effect. In the optic of circular economy, silver chloride derived from the acid pre-treatment of electronic scraps was used as raw material and successively silver powders were synthesized from silver chloride solution using glucose syrup as reducing agent. The coatings were characterized by scanning electron microscope (SEM), X-ray diffraction analysis (XRD), X-ray photoelectron spectroscopy (XPS), potentiodynamic polarization test and antimicrobial tests. The results evidenced that the obtained coatings were homogenous and give to the samples higher corrosion resistance than untreated alloy. The silver particles, found both inside and outside of the pores that characterize the PEO layer, produced an efficacious antimicrobial effect both against E. coli and S. aureus.
在这项工作中，采用含有硅酸盐化合物和微米级银颗粒的碱性溶液在AA7075上制备了等离子体电解氧化（PEO）涂层，以使涂层具有抗菌效果。从循环经济的角度出发，将电子废料酸预处理得到的氯化银用作原料，随后以葡萄糖糖浆为还原剂从氯化银溶液中合成银粉。通过扫描电子显微镜（SEM）、X射线衍射分析（XRD）、X射线光电子能谱（XPS）、动电位极化测试和抗菌测试对涂层进行了表征。结果表明，所获得的涂层是均匀的，并且赋予样品比未处理合金更高的耐腐蚀性。在表征PEO层的孔隙内外均发现的银颗粒，对大肠杆菌和金黄色葡萄球菌均产生了有效的抗菌作用。
