改性氧化铈/水性环氧复合涂层制备及防腐性能分析  

Preparation and Corrosion Resistance Analysis of Modified Cerium Oxide/Waterborne Epoxy Composite Coatings

作　　者：肖垚 贺小燕 万涛 白秀琴 XIAO Yao;HE Xiaoyan;WAN Tao;BAI Xiuqin(Hubei Longzhong Laboratory,Hubei Xiangyang 441000,China;State Key Laboratory of Maritime Technology and Safety,Wuhan University of Technology,Wuhan 430063,China;School of Transportation and Logistics Engineering,Wuhan University of Technology,Wuhan 430063,China;Hubei Swan Coatings Co.,Ltd.,Hubei Xiangyang 441000,China)

机构地区：[1]湖北隆中实验室,湖北襄阳441000 [2]武汉理工大学水路交通控制全国重点实验室,武汉430063 [3]武汉理工大学交通与物流工程学院,武汉430063 [4]湖北天鹅涂料股份有限公司,湖北襄阳441000

出　　处：《表面技术》2024年第14期96-105,189,共11页Surface Technology

基　　金：湖北省自然科学基金创新发展联合基金重点项目(2022CFD029);2023年湖北省重大攻关项目(JD)(2023BAA003)。

摘　　要：目的利用改性氧化铈掺杂水性环氧制备水性复合涂层,提高水性涂层的防腐性能。方法通过硅烷偶联剂接枝纳米氧化铈(CeO_(2)-K),然后原位聚合聚苯胺(PANI),合成了质量比为1︰1、4︰1、7︰1的聚苯胺/氧化铈复合颗粒(PA@CeO_(2)(1︰1)、PA@CeO_(2)(4︰1)及PA@CeO_(2)(7︰1)),制备了硅烷改性氧化铈复合水性环氧涂层(CeO_(2)-K/WEP)、PANI@CeO_(2)复合水性环氧涂层(PA@CeO_(2)(1︰1)/WEP、PA@CeO_(2)(4︰1)/WEP及PA@CeO_(2)(7︰1)/WEP);通过扫描电镜、吸水率试验、电化学测试、中性盐雾试验等探讨改性氧化铈/水性环氧复合涂层的防腐性能。结果改性后CeO_(2)-K颗粒间的团聚作用减弱,PA@CeO_(2)复合粒子呈现“球状+纤维状”纳米复合结构。与水性环氧树脂涂层(WEP)相比,纳米复合涂层的致密性增强,PA@CeO_(2)复合粒子的引入提高了CeO_(2)与环氧树脂间的相容性,并增强了涂层与基体的结合力。PA@CeO_(2)(4︰1)/WEP浸泡30 d后,在最低频率0.01 Hz下表现出最高的阻抗模值,是CeO_(2)-K/WEP的2.4倍,比WEP提高了2个数量级。经过336 h的盐雾试验,WEP和CeO_(2)-K/WEP出现了明显的锈蚀和剥落,而PA@CeO_(2)/WEP涂层剥离区域未发生扩展,表现出更好的耐盐雾性能。结论PA@CeO_(2)/WEP复合涂层的防腐性能优于WEP和CeO_(2)-K/WEP的,其中PA@CeO_(2)(4︰1)/WEP复合涂层的性能最佳。The work aims to prepare waterborne composite coatings with modified cerium oxide nanoparticles to improve their corrosion resistance.The cerium oxide was modified by the coupling agentγ-Glycidoxypropyltrimethoxysilane(KH560)to obtain the silanized cerium oxide(CeO_(2)-K),and then aniline was polymerized in-situ on the surface of CeO_(2)-K particles to obtain the polyaniline/cerium oxide composite particles,with mass ratios of aniline to cerium oxide of 1∶1,4∶1,7∶1,respectively,and were named as PA@CeO_(2)(1∶1),PA@CeO_(2)(4∶1),and PA@CeO_(2)(7∶1).CeO_(2)-K composite waterborne epoxy coatings(CeO2-K/WEP)and PANI@CeO2 composite waterborne epoxy coatings(PA@CeO_(2)(1:1)/WEP,PA@CeO_(2)(4∶1)/WEP and PA@CeO_(2)(7∶1)/WEP)were prepared.The structure and morphology of the modified nanoparticles were characterized by SEM,EDS,and FTIR.The SEM morphology analysis showed that the agglomeration of the CeO_(2)-K particles was attenuated after modification,and the PA@CeO2 composite particles exhibited a'spherical+fibrous'nanocomposite structure,and polyaniline was grafted and coated on the surface of CeO_(2)-K particles.The EDS and FTIR analysis revealed that KH560 and polyaniline successfully grafted onto cerium oxide nanoparticles.The corrosion resistance of modified cerium oxide/waterborne epoxy composite coatings was investigated from different aspects including SEM morphology analysis from surfaces and cross sections,EDS analysis,and LSCM morphology analysis,scratch test,water absorption test,electrochemical test and neutral salt spray test.SEM and LSCM morphology analysis indicated that the nanocomposite coating exhibited enhanced densification without any discernible voids compared with waterborne epoxy coatings,indicating effective hole-filling by nanoparticles.The densification and impermeability of PA@CeO_(2)(4∶1)/WEP coatings was further confirmed through a water absorption test,revealing its exceptionally low water penetration rate of 1.72%.Additionally,the scratch test results,with a grade of 0,in

关 键 词：氧化铈 聚苯胺 水性环氧 复合涂层 防腐性能 

分 类 号：TG172[金属学及工艺—金属表面处理]