仿生多巴胺原位聚合改性氟化石墨烯对水性环氧树脂涂层耐腐蚀性能的影响  

Effects of Biomimetic Dopamine In Situ Polymerization Modified Fluorinated Graphenee on Corrosion Resistance of Waterborne Epoxy Resin Coatings

作　　者：朱建康 李茂东 王良旺 张双红 翟伟 李爽 熊磊 王维科 ZHU Jiankang;LI Maodong;WANG Liangwang;ZHANG Shuanghong;ZHAI Wei;LI Shuang;XIONG Lei;WANG Weike(Guangzhou Academy of Special Equipment Inspection&Testing,Guangzhou 510030,China;National Quality Inspection and Testing Center of Graphene Products(Guangdong),Guangzhou 510030,China;School of Material Science and Engineering,Shaanxi University of Science&Technology,Xi'an 710021,China)

机构地区：[1]广州特种设备检测研究院,广州510030 [2]国家石墨烯产品质量检验检测中心(广东),广州510030 [3]陕西科技大学材料科学与工程学院,西安710021

出　　处：《表面技术》2025年第4期110-121,共12页Surface Technology

基　　金：国家市场监督管理总局科技计划项目(2023MK147);广东省市场监督管理局科技项目(2021CT05,2022CT08);广州市市场监督管理局科技项目(2023KJ11,2024KJ23,2024KJ16)。

摘　　要：目的改善氟化石墨烯在水性环氧树脂涂层中的分散性,增强涂层的耐腐蚀性能。方法受贻贝黏附蛋白的启发,以多巴胺为修饰单体,通过原位聚合生长在氟化石墨烯(FG)表面形成聚多巴胺(PDA)层,从而对FG进行功能化修饰。随后,将FG@PDA作为填料添加到水性环氧树脂(WEP)涂层中,制备了FG@PDA/WEP复合涂层。利用傅里叶变换红外光谱仪(FT-IR)、X-射线衍射仪(XRD)、X-射线光电子能谱仪(XPS)、透射电子显微镜(TEM)和高分辨扫描电子显微镜(SEM)对FG@PDA的化学组成和微观结构等进行了表征分析,并通过电化学阻抗谱(EIS)测试等评估了涂层的耐腐蚀性能。结果多巴胺通过自聚合均匀生长在FG片层表面形成聚多巴胺纳米颗粒,明显提高了FG在乙醇溶剂中的分散稳定性。添加0.5%~1%(质量分数)FG@PDA复合材料的FG@PDA/WEP复合涂层在浸泡10 d后,其低频阻抗模量(|Z|f=0.01 Hz)显著高于纯WEP涂层,保持在108Ω·cm^(2)以上。结论聚多巴胺的引入提供了丰富的反应活性位点,增强了FG与树脂基质的界面相互作用,从而显著提高了涂层的防护性能。Fluorinated graphene,a novel member of the graphene family,retains the characteristic two-dimensional layered structure of graphene and exhibits distinctive properties such as hydrophobicity,wear resistance,and electrical insulation.These attributes make it an excellent candidate for enhancing the corrosion and wear resistance of organic coatings.However,improving its dispersibility within resin matrices poses a significant challenge,given that fluorinated graphene often exhibits poor dispersion and a propensity to agglomerate and stack in organic matrices.Achieving a uniform and stable dispersion is crucial for maximizing its anticorrosion effectiveness.Inspired by the adhesion mechanisms of mussel proteins,the dopamine has been leveraged as a modifying monomer to initiate in situ polymerization,successfully yielding polydopamine(PDA)nanoparticles on the surface of fluorinated graphene flakes.By this innovative approach,a polydopamine-modified fluorinated graphene(FG@PDA)composite material has been prepared,significantly enhancing the dispersibility and consequently boosting the corrosion resistance of coatings.The chemical composition,crystal structure,and micromorphology of FG@PDA were characterized with a range of analytical techniques,including Fourier-transform infrared spectroscopy(FTIR),X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),transmission electron microscopy(TEM),and high-resolution scanning electron microscopy(SEM).The FG@PDA/WEP composite coatings were formulated by incorporating FG@PDA as a nanofiller into aqueous waterborne epoxy resin(WEP).The dispersion of FG@PDA within the coatings was assessed with scanning electron microscopy.The anticorrosion performance of the composite coatings was evaluated through polarization curves(Tafel),electrochemical impedance spectroscopy(EIS)and neutral salt spray test(NSST)supplemented by an analysis of the underlying corrosion protection mechanisms.The results showed that dopamine molecules uniformly adhered to the surface of fluorinated graphe

关 键 词：聚多巴胺 氟化石墨烯 分散 水性环氧涂层 防腐 

分 类 号：TG174[金属学及工艺—金属表面处理]