發(fā)布時間：2018-11-02 11:14

【摘要】：近年來,碳鋼的腐蝕成為鋼材在使用過程中面臨的主要問題,其中有機涂層通過對金屬材料的屏蔽、緩蝕、和電化學保護作用已成為一種簡單有效的防腐手段。由于石墨烯特殊的片層結(jié)構(gòu)和優(yōu)異的物理和化學性能,使石墨烯在防腐方面具有非常廣泛的應用前景。本論文利用高分子表面活性劑輔助電化學法制備穩(wěn)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為穩(wěn)定劑,通過原位聚合的方法制備出水分散性良好的石墨烯/聚吡咯復合材料,再以水溶性有機硅氧烷改性樹脂為成膜物質(zhì),通過溶液共混的方法分別制備石墨烯/有機硅氧烷改性樹脂復合防腐處理液和石墨烯/聚吡咯/有機硅氧烷改性樹脂復合防腐處理液,并將其應用于Q235碳鋼板的腐蝕防護。同時,考察了緩蝕劑種類及含量、膜層厚度對石墨烯復合防腐涂層性能的影響。采用SEM、TEM、AFM、XRD、FTIR及Raman等測試方法對石墨烯和石墨烯/聚吡咯復合材料進行表征,測試結(jié)果表明:在苯乙烯-馬來酸酐共聚物水解液中,石墨電極被成功剝離成單層石墨烯,且苯乙烯-馬來酸酐共聚物吸附在石墨烯表面,賦予了功能化石墨烯優(yōu)異的水分散穩(wěn)定性;高分子功能化石墨烯與聚吡咯成功復合,并具有優(yōu)異的水分散穩(wěn)定性。采用電化學交流阻抗、極化曲線、硫酸銅點滴及鹽水浸泡等測試方法,對石墨烯復合防腐涂層的防腐蝕性能進行了研究。結(jié)果表明:石墨烯/有機硅氧烷改性樹脂復合防腐涂層中,石墨烯的加入顯著提高了復合涂層的防腐性能,當石墨烯含量為0.10%時,石墨烯/有機硅氧烷改性樹脂防腐涂層得防腐性能最佳,同時,膜層越厚,涂層的防腐性能越好。緩蝕劑鉬酸鈉及磷酸對提高復合涂層的防腐能力效果不明顯,偏釩酸鈉及植酸可以顯著提高涂層的防腐能力,當偏釩酸鈉含量為0.06%,植酸含量為0.4%時,涂層的防腐效果最佳。對于加入緩蝕劑植酸及偏釩酸鈉后,改變石墨烯含量,當石墨烯的含量分別為0.15%和0.10%時,復合涂層的抗蝕性能最好;石墨烯/聚吡咯/有機硅氧烷改性樹脂復合防腐涂層中,石墨烯/聚吡咯的加入極大地提高了石墨烯復合涂層的防腐性能,當石墨烯/聚吡咯含量為0.4%時,復合涂層防腐效果最好。緩蝕劑磷酸和鉬酸鈉含量分別低于0.2%和0.02%時,對石墨烯/聚吡咯/有機硅氧烷改性樹脂復合涂層的防腐能力有一定提高,而少量的偏釩酸鈉對石墨烯/聚吡咯/有機硅氧烷改性樹脂復合涂層的防腐性能影響不大,但是植酸的加入會減小復合涂層的防腐性能,并且隨著各種緩蝕劑含量的增多,石墨烯/聚吡咯/有機硅氧烷改性樹脂復合涂層的抗蝕性能均有所下降。
[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.
【學位授予單位】：安徽工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG174.45

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