本文選題：石墨烯 + 氧化石墨烯��； 參考：《深圳大學(xué)》2017年碩士論文

【摘要】：碳納米材料自發(fā)現(xiàn)以來,由于其獨特的結(jié)構(gòu)特性,引起了眾多領(lǐng)域的研究者的廣泛研究。近幾年來,許多人將碳納米材料應(yīng)用到防腐涂料中以增強(qiáng)涂料的防腐性能。本論文研究了不同結(jié)構(gòu)形態(tài)的碳材料對水性涂料防腐性能的影響,實驗主要內(nèi)容有:1、碳納米材料的制備與修飾:采用Hummers法制備單層氧化石墨烯,在混酸的條件下對工業(yè)生產(chǎn)的碳納米管和碳納米洋蔥進(jìn)行氧化修飾以改善其水分散性。利用掃描電子顯微鏡、原子力顯微鏡、X射線衍射,以及拉曼光譜等表征方法對碳納米材料進(jìn)行形貌和結(jié)構(gòu)表征。結(jié)果表明:實驗所用的石墨烯呈片狀結(jié)構(gòu),為多層石墨烯;制備出的單層氧化石墨烯的片層厚度約為1 nm;實驗所用的多壁碳納米管長度達(dá)到微米級別,經(jīng)過混酸處理后的碳納米管缺陷增加,引入含氧基團(tuán),提高了碳納米管在水中的分散穩(wěn)定性;實驗所用的碳納米洋蔥直徑在50~200 nm之間,層間距與石墨的一樣,為0.334 nm,通過混酸處理后的碳納米洋蔥結(jié)構(gòu)沒有變化,在水中的分散性顯著改善。2、采用簡單的溶液共混法將六種納米碳納米填料添加到工業(yè)水性涂料中,經(jīng)過高速攪拌和超聲分散,制備出復(fù)合涂料。采用紅外光譜對所用的工業(yè)涂料進(jìn)行成分分析。對成膜的涂層進(jìn)行表面和斷面形貌表征。親水角測試表征涂層潤濕性表明碳納米填料的添加對涂層表面的潤濕性沒有太大影響。3、采用交流阻抗法、極化曲線和鹽水浸泡法對涂層的防腐性能進(jìn)行測試,結(jié)果表明隨著碳納米填料的添加量逐漸增大,復(fù)合涂層的防腐性能先增大后減小。添加少量的碳納米填料能夠在一定程度上提高涂層的防腐性能,當(dāng)填料含量添加到一定含量,碳納米填料可能會產(chǎn)生少量團(tuán)聚,涂層的防腐性能降低。添加不同結(jié)構(gòu)的碳納米填料,防腐效果不一樣,具有較高長徑比的填料防腐性能較好。本實驗中,電化學(xué)阻抗測試表明添加氧化后的碳納米管的復(fù)合涂層的耐腐蝕性最好。鹽水浸泡試驗表明,涂層在鹽水中浸泡20天后,添加碳納米填料的復(fù)合涂層表面的的腐蝕產(chǎn)物相比于空白涂層明顯較少,防腐性能提高,但是可能由于腐蝕環(huán)境不同,測試結(jié)果與阻抗譜測試結(jié)果有差異。
[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.
【學(xué)位授予單位】：深圳大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TQ637

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