2-6二氨基吡啶改性氧化石墨烯复合涂层的制备及防腐性能  

Preparation and Anticorrosion Performance of 2-6 Diaminopyridine Modified Graphene Oxide Composite Coating

作　　者：郭洪飞 赵增祺 朝宝 楠顶 刘景顺[6] GUO Hongfei;ZHAO Zengqi;CHAO Bao;NAN Ding;LIU Jingshun(Institute of Physical Internet,Jinan University,Zhuhai 519070,China;College of Intelligent Systems Science and Engineering,Jinan University,Zhuhai 519070,China;Baotou Research Institute of Rare Earths,Baotou 014030,China;College of Mechanical Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;College of Chemistry and Chemical Engineering,Inner Mongolia University,Hohhot 010021,China;College of Materials Science and Engineering,Inner Mongolia University of Technology,Hohhot 010051,China)

机构地区：[1]暨南大学物联网与物流工程研究院,珠海519070 [2]暨南大学智能科学与工程学院,珠海519070 [3]包头稀土研究院,包头014030 [4]华中科技大学机械科学与工程学院,武汉430074 [5]内蒙古大学化学化工学院,呼和浩特010021 [6]内蒙古工业大学材料学科与工程学院,呼和浩特010051

出　　处：《中国表面工程》2022年第2期126-139,共14页China Surface Engineering

基　　金：广州市科技计划(202002030321);内蒙古自治区科技计划(2019GG238);广东省学位与研究生教育改革研究(2019JGXM15);广东省高等教育教学研究和改革(2020059);广东省研究生教育创新计划(82620516);广州市创新领军团队(201909010006)资助项目。

摘　　要：石墨烯材料作为填料加入到聚合物涂层中可以有效提高涂层防腐性能。以提高GO分散性获取高防腐性能复合涂层为切入点,采用2-6二氨基吡啶为改性剂制备改性氧化石墨烯复合材料(BGO),分析改性温度、改性剂配比量对BGO制备及防腐性能影响。再将BGO添加到环氧树脂中制备改性氧化石墨烯复合涂层(BGO/EP),探究BGO添加量对复合涂层防腐性能的影响,并揭示涂层防腐机理。XRD、Raman、FT-IR、SEM、AFM、TEM等系列表征结果表明2-6二氨基吡啶成功接枝到GO表面。当反应温度为80℃,改性剂与GO配比量为1∶5时,对GO的改性效果最佳。电化学试验、盐雾试验和附着力试验结果证明,BGO的添加对环氧树脂防腐性能有明显提升作用,且当添加量为0.1 wt.%时效果最佳。在3.5%NaCl溶液中浸泡10 d后BGO/EP的涂层电阻仍达到1.03 GΩ·cm^(2),比纯环氧树脂涂层的38.9 kΩ·cm^(2)提高了5个数量级,比改性前的GO/EP复合涂层的262 kΩ·cm^(2)提高了4个数量级,防腐性能显著提高。研究成果可为进一步优化石墨烯基防腐涂层制备工艺,探究氨基改性氧化石墨烯复合材料在环氧树脂中的分散效果,挖掘其在涂层体系中的作用机理奠定基础。The addition of graphene materials as fillers to polymer coatings can effectively improve the anticorrosion properties of coatings. To improve the dispersion of graphene oxide and obtain a composite coating with high anticorrosion performance, 2-6 diaminopyridine is used as a modifier to prepare the modified GO composite(BGO). The effects of modification temperature and the proportion of modifiers on the preparation and anticorrosion performance of BGO are analyzed. The modified GO composite coating(BGO/EP) is prepared by adding BGO to epoxy resin. The influence of the addition amount of BGO on the anticorrosion performance of the composite coating is investigated, and the anticorrosion mechanism of the coating is revealed. The results of XRD,Raman, FT-IR, SEM, AFM and TEM show that 2-6 diaminopyridine is successfully grafted onto GO surface. The best modification effect of GO is obtained when the reaction temperature is 80 ℃ and the ratio of modifier to GO is 1∶5. The results of electrochemical test, salt spray test and adhesion test show that the addition of BGO significantly improves the corrosion resistance of epoxy resin, and the best effect is obtained when the addition amount is 0.1 wt.%. After soaking in 3.5% NaCl solution for 10 d, the coating resistance of BGO/EP still reaches 1.03 GΩ·m^(2), which is 5 orders of magnitude higher than the 38.9 kΩ·m^(2) of pure epoxy resin coating, 4 orders of magnitude higher than the 262 kΩ·m^(2) of GO/EP composite coating, the anticorrosion performance of coating is significantly improved. The research results can lay a foundation for further optimizing the preparation process of graphene-based anticorrosion coatings, exploring the dispersion effect of amino modified graphene oxide composites in epoxy resin, and exploring its mechanism of action in the coating system.

关 键 词：2-6二氨基吡啶 氧化石墨烯 氨基改性 防腐涂层 

分 类 号：TG174[金属学及工艺—金属表面处理]