摘要
目的通过简单共混的方式在聚合物涂层中引入苯胺四聚体/碳纳米管(TC)复合材料,依靠复合材料本身的电化学活性,在金属表面形成钝化层,以此来改善涂层防腐性能。方法以甲基丙烯酸二甲氨乙酯(DMAEMA)、N-羟甲基丙烯酰胺(NMA)、甲基丙烯酸羟乙酯(HEMA)、丙烯酸异辛酯(EHA)和苯乙烯(St)为原料,制备阴极电泳涂料。同时依靠π—π等相互作用,制备苯胺四聚体/碳纳米管复合材料,并将其引入上述电泳涂料中,通过电沉积在金属表面制备涂层。结果电化学测试结果表明,当碳纳米管(CNTs)的添加量为苯胺四聚体(TANI)的0.5倍时,复合材料电化学活性最佳。当pH˃4时,TANI电化学活性消失,而TC依旧保持一定的电化学活性。超景深显微镜照片表明,随着复合材料的添加量增多,团聚现象明显,当添加量为树脂质量的3%时,分散性最佳。极化曲线也表明,复合材料添加量为树脂的3%时所得涂层防腐性能最优。结论制备的复合材料在宽的pH条件下均存在氧化还原活性。将其加入电泳涂料后,提升了涂料的防腐蚀性能,所得的涂层光滑平整。
The work aims to introduce tetraaniline/carbon nanotubes composites(TC)into the polymer coating to form a passive layer on the surface of the metal by virtue of electrochemical activity of the composite material to improve the corrosion resistance of the coating.A cathodic electrophoretic coating was prepared from 2-(dimethylamino)ethyl methacrylate(DMAEMA),N-(hydroxymethyl)acrylamide(NMA),2-hydroxyethyl methacrylate(HEMA),2-ethylhexyl acrylate(EHA),and styrene(St).Tetraaniline/carbon nanotubes composites(TC)was prepared byπ—πinteractions,and introduced into the above cathodic electrophoretic coating,which was prepared on the metal surface by electrodeposition.The electrochemical test results indicated that the electrochemical activity of the composite was optimal when the amount of carbon nanotubes added was 50%of the aniline tetramer.The electrochemical activity of TANI disappeared when pH>4,while TC still maintained some electrochemical activity.And optical micrographs showed that as the amount of composite added increased,the phenomenon of agglomeration was obvious.The dispersibility of TC in the resin matrix was the best when the mass ratio of TC was 3wt%.The polarization curves also showed that the anticorrosion of the coating was optimal when the mass ratio of TC was 3wt%.The prepared composites have redox activity at a wide pH.Adding it to the electrophoretic coating improves the corrosion resistance of the coating and the resulting coating was smooth and flat.
作者
赵明昕
季磊
魏玮
李小杰
刘晓亚
ZHAO Ming-xin;JI Lei;WEI Wei;LI Xiao-jie;LIU Xiao-ya(School of Chemical and Material Engineering,Jiangnan University,Wuxi 214122,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2020年第10期260-267,共8页
Surface Technology
关键词
苯胺四聚体
碳纳米管
电泳涂料
氧化还原活性
复合涂层
tetraaniline
carbon nanotube
electrophoretic coating
redox activity
composite coating
