L-谷氨酸改性氧化石墨烯复合环氧树脂涂层的制备及防腐性能  

Preparation and anti-corrosion research of graphene oxide modified by L-glutamic acid composite epoxy resin coating

作　　者：丁伟 杜伟 郭铁滨 关潇卓 王铁铮 高健桐 张楠 李达 张兰河[2] DING Wei;DU Wei;GUO Tiebin;GUAN Xiaozhuo;WANG Tiezheng;GAO Jiantong;ZHANG Nan;LI Da;ZHANG Lanhe(Jilin Power Supply Company,State Grid Jilin Electric Power Limited Company,Jilin 132011,Jilin,China;School of Chemical Engineering,Northeast Electric Power University,Jilin 132012,Jilin,China)

机构地区：[1]国网吉林省电力有限公司吉林供电公司,吉林吉林132011 [2]东北电力大学化学工程学院,吉林吉林132012

出　　处：《化工进展》2025年第1期424-435,共12页Chemical Industry and Engineering Progress

基　　金：国网吉林省电力有限公司科技项目(2023-08);吉林省发改委产业技术研究与开发项目(2020C028-5)。

摘　　要：采用L-谷氨酸(L-Glu)对氧化石墨烯(GO)进行改性以提高GO的分散性,改性后的氧化石墨烯(L-GO)作为填料掺杂至环氧树脂(EP)中,制备L-GO/EP涂层。采用X射线衍射仪(XRD)、傅里叶红外光谱仪(FTIR)和扫描电镜(SEM)等分析改性前后GO的形貌结构和表面特性;识别涂层的硬度、耐磨性和附着力等指标的变化,评价涂层的物理性能;利用热重分析仪(TG)、电化学交流阻抗(EIS)和极化曲线(Tafel)考察L-GO/EP的热稳定性和防腐性能。结果表明:与GO相比,改性后的L-GO纳米片层间距增加0.115nm,ID/IG由0.98增加至1.01,L-GO具有更高的无序水平;L-Glu附着于GO表面,增加了GO在环氧树脂中的分散性,解决了GO的团聚问题,提高了涂层的稳定性。与EP和GO/EP相比,L-GO/EP涂层具有最高的硬度(5H)、耐磨性(0.9L/μm)、柔韧性(3mm)、耐冲击强度(50cm)和附着力(1级)。与EP相比,L-GO/EP涂层的腐蚀电流密度由2.85×10^(−6)A/cm^(2)下降到7.65×10^(-8)A/cm^(2),极化电阻由2.06×10^(4)Ω·cm^(2)增加到5.79×10^(5)Ω·cm^(2)。L-GO/EP涂层的防腐性能提高与L-GO分散性和物理阻隔性能增加紧密相关。Graphene oxide(GO)was modified with L-glutamic acid(L-Glu)to improve the dispersibility of GO,and the modified graphene oxide(L-GO)was used as a filler doped into epoxy resin(EP)to prepare L-GO/EP coating.X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR)and scanning electron microscopy(SEM)were used to analyze the morphology and surface properties of GO before and after the modification.The hardness and adhesion of the coatings were identified,and the physical properties of the coatings were evaluated.The thermal stability and anticorrosion properties of L-GO/EP were investigated by using thermogravimetric analyzer(TG),electrochemical alternating impedance(EIS)and polarization curve(Tafel).The results showed that compared with GO,the modified L-GO nanosheet layer spacing increased by 0.115nm,the ID/IG value increased from 0.98 to 1.01 and L-GO had a higher level of disorder.L-Glu attached to the surface of GO,which increased the dispersion of GO in the epoxy resin.The agglomeration problem of GO was solved and the stability of the coating was improved.Compared with EP and GO/EP coatings,L-GO/EP coating offered the highest hardness(5 H),abrasion resistance(0.9L/μm),flexibility(3mm),impact strength(50cm)and adhesion(Class 1).Compared with EP,the corrosion current density of L-GO/EP coating decreased from 2.85×10^(−6)A/cm^(2)to 7.65×10^(-8)A/cm^(2)and the polarization resistance increased from 2.06×10^(4)Ω·cm^(2)to 5.79×10^(5)Ω·cm^(2),respectively.The improvement of anticorrosive properties of L-GO/EP coating were closely related to the increase of dispersion and physical barrier properties of L-GO.

关 键 词：腐蚀 氧化石墨烯 环氧树脂涂料 复合涂层 分散性 物理性能 

分 类 号：TQ633.9[化学工程—精细化工]