新型石墨烯/聚吡咯水性防腐涂料的制备及性能

摘要

Inherent shortcomings of the traditional grapheme anticorrosive coatings include inhomogeneous packing components,low anticorrosion performance,and unstable paintcoat. To improve the anticorrosion performance and dispersibility of the graphene anticorrosive coating,an innovative grapheme(rGO)/polypyrrole(PPy)/waterborne epoxy resin(EP)was prepared using rGO/PPy and EP as fillers and film forming material,respectively. The modifiedin situpolymerization method was applied to prepare rGO/PPy complex. The structure of the coating composition was characterized by X-ray diffractometer(XRD),fourier infrared spectrum(FTIR),raman spectra (Raman),scanning electron microscope(SEM)and transmission electron microscopy(TEM), respectively. The anticorrosive performance of rGO/PPy/EP coating on Q235 carbon steel was determined by Tafel polarization curves(Tafel),impedance spectra(EIS)and corrosion morphology. The results showed that the rGO/PPy coating prepared by modifiedin situ polymerization method had excellent dispersibility and compact structure. The corrosion potentialEcorr,the corrosion current density Icorr and the protection of bare steelPi of the 1% rGO/PPy/EP coating were –613mV,46.42μA/cm2 and 91.02%,respectively. Compared with rGO/EP anti-corrosive coating,the corrosion current density of rGO/PPy/EP coating was decreased by 38.62μA/cm2. Furthermore,the rGO/PPy/EP coating possessed excellent barrier properties to O2 and H2O. In conclusion,the rGO/PPy/EP anticorrosive coating prepared byin situ polymerization method was promising as it was environment-friendly,excellent in dispersibility,stable in structure and outstanding in anticorrosion.%传统的石墨烯防腐涂料存在填料成分不均一、防腐性能低、涂层不稳定等问题.为了提高石墨烯防腐涂料的分散性能和防腐性能,本文采用改进原位聚合法合成的石墨烯(rGO)/聚吡咯(PPy)复合物为填料,水性环氧树脂(EP)为成膜物质,制备新型石墨烯/聚吡咯水性防腐涂料(rGO/PPy/EP).采用X射线衍射(XRD)、傅里叶红外光谱(FTIR)、拉曼光谱(Raman)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)对涂料进行结构分析,通过塔菲尔极化曲线(Tafel)、交流阻抗谱图(EIS)和腐蚀形貌分析测试rGO/PPy/EP对Q235碳钢的防腐性能.结果表明:采用改进原位聚合法制备的rGO/PPy/EP涂料分散性好,结构致密.质量分数为1%rGO/PPy/EP涂料的腐蚀电位Ecorr=–613mV,腐蚀电流密度Icorr=46.42μA/cm2,对裸钢的保护度Pi=91.02%.与rGO/EP涂料相比,rGO/PPy/EP涂料的腐蚀电流密度降低了38.62μA/cm2,对O2和H2O腐蚀介质具有较高的屏蔽性能.因此,原位聚合法制备的rGO/PPy水性涂料具有环境友好、分散性能强、结构稳定和防腐性能优异等优点,具有广阔的应用前景.