碳材料基复合水性涂料的制备及其防腐性能的研究

发布时间：2018-04-27 06:20

本文选题：石墨烯 + 氧化石墨烯　；参考：《深圳大学》2017年硕士论文

【摘要】：碳纳米材料自发现以来,由于其独特的结构特性,引起了众多领域的研究者的广泛研究。近几年来,许多人将碳纳米材料应用到防腐涂料中以增强涂料的防腐性能。本论文研究了不同结构形态的碳材料对水性涂料防腐性能的影响,实验主要内容有:1、碳纳米材料的制备与修饰:采用Hummers法制备单层氧化石墨烯,在混酸的条件下对工业生产的碳纳米管和碳纳米洋葱进行氧化修饰以改善其水分散性。利用扫描电子显微镜、原子力显微镜、X射线衍射,以及拉曼光谱等表征方法对碳纳米材料进行形貌和结构表征。结果表明:实验所用的石墨烯呈片状结构,为多层石墨烯;制备出的单层氧化石墨烯的片层厚度约为1 nm;实验所用的多壁碳纳米管长度达到微米级别,经过混酸处理后的碳纳米管缺陷增加,引入含氧基团,提高了碳纳米管在水中的分散稳定性;实验所用的碳纳米洋葱直径在50~200 nm之间,层间距与石墨的一样,为0.334 nm,通过混酸处理后的碳纳米洋葱结构没有变化,在水中的分散性显著改善。2、采用简单的溶液共混法将六种纳米碳纳米填料添加到工业水性涂料中,经过高速搅拌和超声分散,制备出复合涂料。采用红外光谱对所用的工业涂料进行成分分析。对成膜的涂层进行表面和断面形貌表征。亲水角测试表征涂层润湿性表明碳纳米填料的添加对涂层表面的润湿性没有太大影响。3、采用交流阻抗法、极化曲线和盐水浸泡法对涂层的防腐性能进行测试,结果表明随着碳纳米填料的添加量逐渐增大,复合涂层的防腐性能先增大后减小。添加少量的碳纳米填料能够在一定程度上提高涂层的防腐性能,当填料含量添加到一定含量,碳纳米填料可能会产生少量团聚,涂层的防腐性能降低。添加不同结构的碳纳米填料,防腐效果不一样,具有较高长径比的填料防腐性能较好。本实验中,电化学阻抗测试表明添加氧化后的碳纳米管的复合涂层的耐腐蚀性最好。盐水浸泡试验表明,涂层在盐水中浸泡20天后,添加碳纳米填料的复合涂层表面的的腐蚀产物相比于空白涂层明显较少,防腐性能提高,但是可能由于腐蚀环境不同,测试结果与阻抗谱测试结果有差异。
[Abstract]:Since the discovery of carbon nanomaterials, due to their unique structural properties, they have attracted extensive research in many fields. In recent years, many people applied carbon nano-materials to anticorrosive coatings to enhance their anticorrosive properties. In this paper, the effect of carbon materials with different structure on the anticorrosion properties of waterborne coatings was studied. The main contents of the experiments were: the preparation and modification of carbon nanomaterials: preparation of graphene oxide monolayers by Hummers method, Carbon nanotubes (CNTs) and carbon nanoscale onions (CNTs) were modified with mixed acid to improve their water dispersion. The morphology and structure of carbon nanomaterials were characterized by scanning electron microscopy, atomic force microscopy and Raman spectroscopy. The results show that the graphene used in the experiment is flake and multilayer graphene; the thickness of the monolayer graphene oxide is about 1 nm; the length of the multiwalled carbon nanotubes used in the experiment reaches the micron level. After mixed acid treatment, the defects of carbon nanotubes increased, oxygen groups were introduced, and the dispersion stability of carbon nanotubes in water was improved. The diameter of carbon nanotubes used in the experiment was between 50nm and 200nm, and the interlayer spacing was the same as that of graphite. For 0.334 nm, the structure of carbon nano-onion treated by mixed acid has no change, and the dispersion of carbon nano-onion in water has been improved significantly. Six kinds of nano-carbon nano-fillers were added to industrial water-based coatings by simple solution blending method. The composite coating was prepared by high speed agitation and ultrasonic dispersion. The composition of industrial coatings was analyzed by infrared spectrum. The surface and cross section morphology of the coating were characterized. The wettability of the coating was characterized by hydrophilic angle test. It showed that the addition of carbon nano-filler had little effect on the wettability of the coating surface. The corrosion resistance of the coating was tested by AC impedance method, polarization curve and salt water immersion method. The results show that the anticorrosive property of the composite coating increases first and then decreases with the increase of the content of carbon nano-filler. The anticorrosive property of the coating can be improved to some extent by adding a small amount of carbon nano-filler. When the filler content is added to a certain content, the carbon nano-filler may produce a small amount of agglomeration, and the anticorrosive property of the coating will be reduced. The anticorrosive effect of carbon nano-filler with different structure is different, and the packing with higher aspect ratio has better anticorrosive performance. In this experiment, the electrochemical impedance test showed that the composite coating with oxidized carbon nanotubes had the best corrosion resistance. After immersion in brine for 20 days, the corrosion products on the surface of the composite coating with carbon nano-filler were obviously less than those of the blank coating, but the corrosion resistance of the coating was improved, but the corrosion environment was different. The results are different from the results of impedance spectroscopy.
【学位授予单位】：深圳大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ637

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