硅烷改性纳米TiO_2-Zn-Al/水性环氧涂层的防腐性能  

Anticorrosion performance of silane modified nano TiO_2-Zn-Al/waterborne epoxy coatings

作　　者：贾涉 姚正军[1,2] 张莎莎 杜文博 JIA She;YAO Zhengjun;ZHANG Shasha;DU Wenbo(College of Material Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China;Key Laboratory of Materials Preparation and Protection for Harsh Environment,Ministry of Industry and Information Technology,Nanjing 211106,China)

机构地区：[1]南京航空航天大学材料科学与技术学院,南京211106 [2]面向苛刻环境的材料制备与防护技术工业和信息化部重点实验室,南京211106

出　　处：《复合材料学报》2018年第9期2405-2413,共9页Acta Materiae Compositae Sinica

基　　金：江苏省"六大人才高峰"第十二批高层次人才资助项目(YPC16005-PT);江苏高校优势学科建设工程资助项目;国家自然科学基金(5170010394)

摘　　要：为实现纳米TiO_2颗粒的均匀分散,首先对纳米TiO_2进行硅烷改性,再通过溶液共混法制备出不同纳米TiO_2添加量的硅烷改性纳米TiO_2-Zn-Al/水性环氧复合涂层。研究了纳米TiO_2与Zn-Al片层粉在涂层中的综合作用。利用XRD和FTIR分析涂层的物相组成和组织结构,SEM和EDS表征涂层表面的微观形貌和元素组成,采用极化曲线和电化学阻抗谱(EIS)研究涂层的耐腐蚀性能。EDS和FTIR表明,经改性的纳米TiO_2均匀分散于涂层中,纳米TiO_2与环氧树脂的枝联作用使涂层更加致密。EIS结果显示,由于Zn-Al片层粉与纳米TiO_2的枝联和填充作用,使添加纳米TiO_2的硅烷改性纳米TiO_2-Zn-Al/水性环氧涂层腐蚀行为较未添加纳米TiO_2时有所减缓。当纳米TiO_2添加量增加到4wt%时,硅烷改性纳米TiO_2-Zn-Al/水性环氧涂层的腐蚀电流密度为9.86×10^(-6) A/cm^2,比未添加纳米TiO_2的涂层高一个量级。In order to achieve homodisperse of nano TiO2,nano TiO2 was treated by the silane coupling agent and the ZnAl/waterborne epoxy composited coatings containing silane modified nano TiO2 were prepared by incorporating different mass fraction of TiO2 nanoparticles in the epoxy resin and ZnAl powders via solution blended process.The combination action of the nano TiO2 and ZnAl flake powder in the coating was explored.The XRD and FTIR were used to analyze the phase composition and structure of the coating.The micro morphology and elementary composition of the coating surface were representated by the SEM and EDS.The corrosion resistance of coatings was investigated by polarization curves and electrochemical impedance spectroscopy（EIS）tests.EDS and FTIR results suggest that the modified nano TiO2 is symmetrical dispersion in the coating,the crosslinking reaction of nano TiO2 and epoxy resin makes the coating more pyknoticly.The EIS tests show that due to the filling effects of ZnAl flake powder and nano TiO2,the corrosion behavior of the silane modified nano TiO2ZnAl/waterborne epoxy coatings is more slower than that of nano TiO2,when the content of nano TiO2 increases to 4 wt%,the corrosion current density of the silane modified nano TiO2ZnAl/waterborne epoxy coatings is 9.86×10^6 A/cm^2,the corrosion current density is higher one rank than none nano TiO2.

关 键 词：纳米TIO2 硅烷改性 防腐 ZN-AL 环氧涂料 

分 类 号：TG178[金属学及工艺—金属表面处理]