GO/Si_(3)N_4改性环氧树脂涂层防腐透波性能研究  

Anticorrosion and Wave Transmission Properties of GO/Si_(3)N_(4) Modified Epoxy Resin Coatings

作　　者：王贤明 李文 李航 陈守刚[2] 刘盈[2] 肖锋[3] WANG Xian-ming;LI Wen;LI Hang;CHEN Shou-gang;LIU Ying;XIAO Feng(State Key Laboratory of Marine Coatings,Qingdao 266071,China;School of Materials Science and Engineering,Ocean University of China,Qingdao 266100,China;PLA Naval Submarine Academy,Qingdao 266199,China)

机构地区：[1]海洋涂料国家重点试验室,山东青岛266071 [2]中国海洋大学材料科学与工程学院,山东青岛266100 [3]海军潜艇学院,山东青岛266199

出　　处：《表面技术》2021年第5期303-314,共12页Surface Technology

基　　金：海洋涂料国家重点试验室开放课题基金(GZ-19-0004);中央高校基本科研业务费专项(202065001)。

摘　　要：目的设计并制备集透波、耐蚀一体化天线罩防护涂层。方法利用KH550与KH560硅烷偶联剂分别对GO与Si_(3)N_(4)进行改性,分别得到改性的f-GO与f-Si_(3)N_(4),然后将两者进行复合,制得了不同配比的f-GO/f-Si_(3)N_(4)纳米复合材料,将所得纳米复合物填料对环氧树脂涂层进行改性。通过扫描电子显微镜解析改性填料在涂层中的分布状态,利用电化学交流阻抗、极化曲线、吸水试验等方法,分别评价改性涂层的吸水率、耐蚀性,利用介电常数与介电损耗正切值,评价涂层透波性能。结果借助两种硅烷改性,实现了f-GO与f-Si_(3)N_(4)的化学键合复合。随着f-GO在复合填料中比例的增加,复合填料在环氧树脂涂层中的分散性先升高后下降。涂层极化曲线表明,GS-15改性的环氧树脂涂层具有最小的腐蚀电流密度(1.62×10^(–11) A/cm^(2))和最高的腐蚀电位(–0.462 V)。涂层电化学阻抗测试表明,当涂层浸泡至3000 h后,GS-15涂层的|Z|0.01 Hz值为9.2×10^(10)Ω·cm^(2),比GS-0涂层的低频阻抗模量高约2个数量级。涂层吸水率测试表明,GS-15改性环氧树脂涂层具有最小的吸水率。涂层介电性能测试表明,GS-15改性环氧树脂涂层的介电稳定性更高,同时具有最低的介电常数和介电损耗。结论在环氧树脂中当复合填料的添加量为5%时,f-Si_(3)N_(4)与f-GO配比为7∶3时,复合材料在环氧树脂涂层中的分散性最佳,涂层具有最好的耐腐蚀和透波性能。This paper is intended to design and prepare a radome protective coating with integrated excellent wave transmission and corrosion resistance.Firstly,silane coupling agents of 3-aminopropyl triethoxysilane(KH550)andγ-(2,3-epoxypropoxy)propyltrimethoxysilane(KH-560)were used to modify graphene oxide(GO)and silicon nitride(Si3N4)to prepare f-GO and f-Si3N4,respectively.Then,f-GO and f-Si3N4 were combined by covalent bond due to the reaction between the epoxy group and amino group in the modified KH560 and KH550,respectively.Five kinds of f-GO/f-Si3N4 composite materials were prepared by regulating the contents of f-GO in the composite materials.After that,the f-GO/f-Si3N4 composite materials with mass fraction of 5wt.%were added into the epoxy based composite coatings which were used as nanofiller.The dispersion states of the f-GO/f-Si3N4 composite materials were studied by SEM images of coating surface and fracture surface.The anticorrosion performances of the composite coatings were estimated by polarization curves,electrochemical impedances and water absorption.Moreover,the wave transmission performances of the coatings were measured by dielectric constant and dielectric loss tangent.The properties and structure of f-GO and f-Si3N4 were confirmed by FT-IR spectra,XPS spectra,TEM images,and TG curves.The results also showed that the dispersion of the f-GO/f-Si3N4 composite materials increased at first and then decreased as the content of f-GO in above composite materials increasing.From the polarization curves,the epoxy coating modified by GS-15 obtained the minimum corrosion current density(1.62×10^(–11) A/cm^(2))and much more positive corrosion potential(–0.462 V)among the title coating compositions.Electrochemical impedance spectroscopy showed that the|Z|0.01 Hz of the GS-15 modified epoxy coating after 3000 h immersion was 9.2×10^(10)Ωcm^(2),which was two orders of magnitude higher than the low frequency impedance of GS-0 modified epoxy coating.The GS-15 modified epoxy coating also showed the lowest w

关 键 词：透波防腐 防护涂料 制备 复合纳米填料 氧化石墨烯 氮化硅 环氧树脂 

分 类 号：TG174.4[金属学及工艺—金属表面处理]