芳基磷酸酯盐改性石墨烯/水性环氧涂层的耐腐蚀性能研究  

Study on Anti-corrosion Performance of Aryl Phosphate Salt Modified Graphene/Waterborne Epoxy Composite Coating

作　　者：黄志雄 胡新军 田建平 陈满骄 马小燕 江雪莲 唐诗应 HUANG Zhixiong;HU Xinjun;TIAN Jianping;CHEN Manjiao;MA Xiaoyan;JIANG Xuelian;TANG Shiying(School of Mechanical Engineering,Sichuan University of Science&Engineering,Zigong 643000,Sichuan,China;Material Corrosion and Protection Key Laboratory of Sichuan Province,Sichuan University of Science&Engineering,Zigong 643000,Sichuan,China)

机构地区：[1]四川轻化工大学机械工程学院,四川自贡643000 [2]四川轻化工大学材料腐蚀与防护四川省重点实验室,四川自贡643000

出　　处：《材料导报》2023年第13期223-229,共7页Materials Reports

基　　金：四川省科技计划(2022YFG0275);四川轻化工大学研究生创新基金(y2020013)。

摘　　要：为了提高石墨烯在水性环氧树脂(EP)中的分散性和相容性,通过2,2′-亚甲基-双(4,6-二叔丁基苯酚)磷酸钠(NA-11)对石墨烯进行改性处理,改性后的石墨烯分散在环氧树脂中,加入固化剂制得石墨烯/环氧涂层。采用扫描电子显微镜(SEM)、X射线衍射(XRD)、红外光谱(FTIR)、交流阻抗谱(EIS)和动电位极化曲线(Tafel)对复合涂层的结构和防腐性能进行测试分析。结果表明,NA-11改性石墨烯在水和环氧树脂中具有良好的分散性。改性后的石墨烯能显著提高复合涂层的防腐性能,其初始阻抗模量(|Z|_(0.01 Hz))从445.7 kΩ·cm^(2)提高至5047 kΩ·cm^(2),自腐蚀电流密度(i corr)从0.2023μA·cm^(-2)降低至0.006441μA·cm^(-2),石墨烯的物理阻隔性和“迷宫效应”使得涂层对基体的长期防护效果显著提升。In this work,in order to improve the dispersion and compatibility of graphene in aqueous epoxy resin(EP),graphene is modified by 2,2′-methylene bis(4,6-di-tert-butylphenol)sodium phosphate(NA-11).The modified graphene was dispersed in epoxy resin,and the curing agent was added to prepare graphene/epoxy coating.The scanning electron microscopy(SEM),X-ray diffraction(XRD),infrared spectroscopy(FTIR),AC impedance spectroscopy(EIS)and potentiodynamic polarization curve(Tafel)were used to analyze the structure and corrosion resistance of the composite coating.The obtained results show that NA-11 modified graphene has a high dispersibility in water and epoxy resin.The modified graphene can significantly improve the corrosion resistance of the composite coating,the initial impedance modulus(|Z|_(0.01 Hz))increased from 445.7 kΩ·cm^(2)to 5047 kΩ·cm^(2),and the self-corrosion current density(i corr)decreased from 0.2023μA·cm^(-2)to 0.006441μA·cm^(-2).Finally,the physical barrier property and‘labyrinth effect’of graphene significantly improve the long-term protective effect of the coating on the substrate.

关 键 词：石墨烯 环氧树脂 涂层 防腐性能 长期防护 

分 类 号：TB304[一般工业技术—材料科学与工程]