纯镁表面聚多巴胺膜的制备及表征  

Preparation and Characterization of Polydopamine Films on Pure Magnesium Surface

作　　者：乔丽英[1] 姚艳 王勇[1] 赖宁 王维朗[1] QIAO Liying;YAO Yan;WANG Yong;LAI Ning;WANG Weilang(College of Materials Science and Engineering∥International Joint Laboratory for Light Alloys of the Ministry of Education∥State Magnesium Materials Engineering Technology Research Center,Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆大学材料科学与工程学院∥轻合金材料国际联合实验室(教育部)∥国家镁材料工程技术研究中心,重庆400044

出　　处：《华南理工大学学报（自然科学版）》2018年第7期16-23,共8页Journal of South China University of Technology(Natural Science Edition)

基　　金：重庆市应用开发计划资助项目(ctsc2014yykfc50002);重庆大学中央高校基本科研业务费专项资金资助项目(2018CDJDCL0019)~~

摘　　要：为降低纯镁的腐蚀速率和赋予镁材料较好的细胞亲和力,通过溶液浸泡法在纯镁表面成功制备了单一聚多巴胺(PDA)膜和Mg(OH)2-PDA复合膜,通过单因素实验确定两种膜层制备的最佳工艺,利用场发射扫描电镜和动电位极化法分析了DA质量浓度与成膜时间对膜层形貌和耐蚀性的影响,利用傅立叶反射红外分析研究了两种膜层的化学结构.结果表明:制备PDA膜的最佳工艺条件为DA质量浓度1. 0 g/L、成膜时间12 h,制备Mg(OH)2-PDA复合膜的最佳工艺条件为DA质量浓度1. 5 g/L、成膜时间20 h;最佳工艺参数下基体的耐蚀性能得到显著提高,Mg(OH)2-PDA复合膜的耐蚀性最好;在纯镁上获得的PDA薄膜有明显裂纹缺陷;水热处理得到的Mg(OH)2膜层的微观结构为与聚多巴胺结合提供了更好位点,得到了更均匀的聚多巴胺膜.In order to decrease the corrosion rate of the pure magnesium and improve cell affinity of magnesium materials,polydopamine(PDA)films and Mg(OH)2-PDA composite films are deposited on the pure magnesium surface.The optimum process of two kinds of films is investigated by the single factor experiment.The effects of DA mass concentration and film-forming time on film morphology and corrosion resistance are analyzed by field emission scanning electron microscope and dynamic potential polarization method.The chemical structure of the two films is studied by Fourier transform infrared spectroscopy.The results show that the optimum technological conditions for the preparation of PDA films is DA mass concentration of 1.0 g/L,and the film-forming of 12 h;the optimum technological conditions for the preparation of Mg(OH)2-PDA composite films are the DA mass concentration of 1.5 g/L and the film-forming time of 20 h.The corrosion resistance of the substrate is significantly improved under the optimum process parameters,and the corrosion resistance of Mg(OH)2-PDA composite films is the best.The obtained PDA films on pure magnesium have obvious crack defects.The microstructure of Mg(OH)2 films obtained by water heat treatment can provide a better site for the binding of polydopamines,which results in a more uniform polydopamine film.

关 键 词：纯镁 聚多巴胺 表面改性 膜 耐蚀性 腐蚀速率 

分 类 号：TG178[金属学及工艺—金属表面处理]