碳钢表面石墨烯复合防腐涂层的制备及性能研究

发布时间：2018-11-02 11:14

【摘要】：近年来,碳钢的腐蚀成为钢材在使用过程中面临的主要问题,其中有机涂层通过对金属材料的屏蔽、缓蚀、和电化学保护作用已成为一种简单有效的防腐手段。由于石墨烯特殊的片层结构和优异的物理和化学性能,使石墨烯在防腐方面具有非常广泛的应用前景。本论文利用高分子表面活性剂辅助电化学法制备稳定的高分子功能化石墨烯水分散液,并以高分子功能化石墨烯为稳定剂,通过原位聚合的方法制备出水分散性良好的石墨烯/聚吡咯复合材料,再以水溶性有机硅氧烷改性树脂为成膜物质,通过溶液共混的方法分别制备石墨烯/有机硅氧烷改性树脂复合防腐处理液和石墨烯/聚吡咯/有机硅氧烷改性树脂复合防腐处理液,并将其应用于Q235碳钢板的腐蚀防护。同时,考察了缓蚀剂种类及含量、膜层厚度对石墨烯复合防腐涂层性能的影响。采用SEM、TEM、AFM、XRD、FTIR及Raman等测试方法对石墨烯和石墨烯/聚吡咯复合材料进行表征,测试结果表明:在苯乙烯-马来酸酐共聚物水解液中,石墨电极被成功剥离成单层石墨烯,且苯乙烯-马来酸酐共聚物吸附在石墨烯表面,赋予了功能化石墨烯优异的水分散稳定性;高分子功能化石墨烯与聚吡咯成功复合,并具有优异的水分散稳定性。采用电化学交流阻抗、极化曲线、硫酸铜点滴及盐水浸泡等测试方法,对石墨烯复合防腐涂层的防腐蚀性能进行了研究。结果表明:石墨烯/有机硅氧烷改性树脂复合防腐涂层中,石墨烯的加入显著提高了复合涂层的防腐性能,当石墨烯含量为0.10%时,石墨烯/有机硅氧烷改性树脂防腐涂层得防腐性能最佳,同时,膜层越厚,涂层的防腐性能越好。缓蚀剂钼酸钠及磷酸对提高复合涂层的防腐能力效果不明显,偏钒酸钠及植酸可以显著提高涂层的防腐能力,当偏钒酸钠含量为0.06%,植酸含量为0.4%时,涂层的防腐效果最佳。对于加入缓蚀剂植酸及偏钒酸钠后,改变石墨烯含量,当石墨烯的含量分别为0.15%和0.10%时,复合涂层的抗蚀性能最好;石墨烯/聚吡咯/有机硅氧烷改性树脂复合防腐涂层中,石墨烯/聚吡咯的加入极大地提高了石墨烯复合涂层的防腐性能,当石墨烯/聚吡咯含量为0.4%时,复合涂层防腐效果最好。缓蚀剂磷酸和钼酸钠含量分别低于0.2%和0.02%时,对石墨烯/聚吡咯/有机硅氧烷改性树脂复合涂层的防腐能力有一定提高,而少量的偏钒酸钠对石墨烯/聚吡咯/有机硅氧烷改性树脂复合涂层的防腐性能影响不大,但是植酸的加入会减小复合涂层的防腐性能,并且随着各种缓蚀剂含量的增多,石墨烯/聚吡咯/有机硅氧烷改性树脂复合涂层的抗蚀性能均有所下降。
[Abstract]:In recent years, the corrosion of carbon steel has become a major problem in the process of steel application. Organic coating has become a simple and effective anticorrosion method through shielding, corrosion inhibition and electrochemical protection to metal materials. Graphene is widely used in anticorrosion due to its special lamellar structure and excellent physical and chemical properties. In this paper, the polymer functionalized graphene aqueous dispersion was prepared by using polymer surfactant assisted electrochemical method, and the polymer functionalized graphene was used as stabilizer. Graphene / polypyrrole composites with good dispersion in effluent were prepared by in-situ polymerization, and then water-soluble organosiloxane modified resin was used as film-forming material. Graphene / organosiloxane modified resin composite anticorrosion solution and graphene / polypyrrole / organosiloxane modified resin composite anticorrosion solution were prepared by solution blending method, and were applied to the corrosion protection of Q235 carbon steel plate. At the same time, the effects of kinds and contents of corrosion inhibitor and thickness of film on the performance of graphene composite anticorrosive coating were investigated. Graphene and graphene / polypyrrole composites were characterized by SEM,TEM,AFM,XRD,FTIR and Raman. Graphite electrode was successfully stripped into monolayer graphene and styrene-maleic anhydride copolymer was adsorbed on the surface of graphene which gave functionalized graphene excellent water dispersion stability. Polymer functionalized graphene and polypyrrole have been successfully combined and have excellent water dispersion stability. The corrosion resistance of graphene composite anticorrosive coating was studied by electrochemical impedance, polarization curve, copper sulfate drop and brine immersion. The results show that graphene / organosiloxane modified resin can improve the anticorrosion performance of the composite coating, when the content of graphene is 0.10. The anticorrosive property of graphene / organosiloxane modified resin is the best, and the thicker the coating is, the better the anticorrosive property of the coating is. The corrosion inhibitor sodium molybdate and phosphoric acid have no obvious effect on improving the anticorrosion ability of the composite coating. Sodium metavanadate and phytic acid can significantly improve the anticorrosion ability of the coating. When the content of sodium metavanadate is 0.06 and the content of phytic acid is 0.4, The coating has the best anticorrosion effect. When the corrosion inhibitor phytic acid and sodium metavanadate were added to change the content of graphene the composite coating had the best corrosion resistance when the content of graphene was 0.15% and 0.10% respectively. In graphene / polypyrrole modified resin composite anticorrosive coating, graphene / polypyrrole is added to improve the anticorrosive performance of graphene / polypyrrole composite coating greatly, when the content of graphene / polypyrrole is 0.4, The composite coating has the best anticorrosion effect. When the contents of corrosion inhibitor phosphoric acid and sodium molybdate were lower than 0.2% and 0.02%, respectively, the anticorrosion ability of graphene / polypyrrole / organosiloxane modified resin composite coating was improved. However, a small amount of sodium metavanadate had little effect on the anticorrosion performance of graphene / polypyrrole / organosiloxane modified resin composite coating, but the addition of phytic acid would reduce the anticorrosion performance of the composite coating, and with the increase of the content of various corrosion inhibitors, The corrosion resistance of graphene / polypyrrole / organosiloxane modified resin composite coating decreased.
【学位授予单位】：安徽工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG174.45

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