Preparation of graphene oxide modified epoxy resin coating and research on its anti-corrosive performance

doi:10.16085/j.issn.1000-6613.2020-1790

Abstract

Abstract:

Epoxy resin is easy to produce micropore during the process of solvent evaporation, which can impact its corrosion resistance performance. In order to improve the corrosion resistance of epoxy resin, the closed oxidation method was applied to prepare grapheme oxide. Graphene oxide/epoxy resin anti-corrosion coatings were prepared by dispersing the grapheme oxide aqueous solution into epoxy resin using wet transfer method. The structure change of graphene oxide was characterized by infrared spectroscopy (FTIR), X-ray diffraction (XRD) and Raman spectroscopy (Raman). The anti-corrosion performance of graphene oxide/epoxy resin coating was analyzed by origination potential (OCP), water contact angle, corrosion morphology and gas permeation rate. The results showed that in comparison with EP coatings, the open circuit potential and water contact angle of GO/EP were 0.181V and 86.12°, which were increased by 0.066V and 10.5°, respectively. When GO/EP was immersed in 3.5% NaCl solution and corroded for 20 days, the surface only had roughness. The coating had good stability and strong barrier performance. Compared with EP coating, the O₂ and H₂O permeability of GO/EP coating were decreased by 51.2% and 65.5%, respectively.

Key words: corrosion, epoxy resin, graphene oxide, composites, anti-corrosion performance, mechanical properties

摘要：

环氧树脂在溶剂蒸发过程中容易产生微孔，影响其防腐蚀性能。为了提高其对腐蚀介质的阻碍能力，本文采用密闭氧化法制备氧化石墨烯，再利用湿式转移法将氧化石墨烯水溶液分散在环氧树脂中，制备氧化石墨烯/环氧树脂防腐涂料。通过红外光谱（FTIR）、X射线衍射（XRD）和拉曼光谱（Raman）分析氧化石墨烯的结构变化，利用开路电位测试（OCP）、水接触角、腐蚀形貌和气体透过率分析氧化石墨烯/环氧树脂涂料的防腐性能。结果表明，氧化石墨烯/环氧树脂（GO/EP）涂料的开路电位和水接触角分别为0.181V和86.12°，与纯环氧树脂涂料相比，分别提高了0.066V和10.5°；当GO/EP浸泡在3.5%NaCl溶液中腐蚀20天后，表面仅产生了粗糙化，涂层稳定性好，屏障性能强；与EP涂层相比，GO/EP涂层的O₂和H₂O渗透率分别降低了51.2%和65.5%。

关键词: 腐蚀, 环氧树脂, 氧化石墨烯, 复合材料, 防腐性能, 机械性能

CLC Number:

TQ0312

MA Jun, SUN Dong, ZHANG Mingshuang, ZHANG Lanhe, CHEN Zicheng. Preparation of graphene oxide modified epoxy resin coating and research on its anti-corrosive performance[J]. Chemical Industry and Engineering Progress, 2021, 40(8): 4456-4462.

马骏, 孙冬, 张明爽, 张兰河, 陈子成. 氧化石墨烯改性环氧树脂涂料的制备及防腐性能[J]. 化工进展, 2021, 40(8): 4456-4462.

Figures/Tables 8

涂料	$P_{O_{2}}$ /g·m^-2·h^-1	$P_{H_{2} O}$ /g·m^-2·h^-1
EP	0.9653	238.45
GO/EP	0.4713	82.17

涂料	$P_{O_{2}}$ /g·m^-2·h^-1	$P_{H_{2} O}$ /g·m^-2·h^-1
EP	0.9653	238.45
GO/EP	0.4713	82.17

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