负载缓蚀剂埃洛石纳米管/含硅聚氨酯复合涂层的防腐性能研究  

Research on anti-corrosion performance of elonite nanotubes/silicon-containing polyurethane composite coating

作　　者：刘成[1] 雷永林[1] 朱雪梅 罗茜 梁瑶 LIU Cheng;LEI Yong-lin;ZHU Xue-mei;LUO Qian;LIANG Yao(School of Materials and Chemistry,Southwest University of Science and Technology,Mianyang 621010,China)

机构地区：[1]西南科技大学材料与化学学院,四川绵阳621010

出　　处：《现代化工》2024年第7期169-174,179,共7页Modern Chemical Industry

基　　金：玄武岩纤维及复合材料四川省重点实验室开放课题(XXKFJJ202304);西南科技大学博士基金(zx7114)

摘　　要：利用二价铜离子将缓蚀剂8-羟基喹啉封装在埃洛石纳米管内,将其加入含硅聚氨酯涂层(PU)中制备复合防腐涂层并涂覆在Q235碳钢表面。利用傅里叶变换红外光谱、热重分析和透射电镜对封装缓蚀剂的埃洛石纳米管(HNTs/8-HQ/Cu^(2+))形貌和结构进行表征。在3.5%NaCl溶液中,通过电化学阻抗谱和Tafel极化曲线表征质量分数分别为0%、0.5%、1%、1.5%、2%和2.5%HNTs/8-HQ/Cu^(2+)的负载缓蚀剂埃洛石纳米管/含硅聚氨酯复合涂层(PU/HNTs)的耐腐蚀性。结果表明,PU/HNTs涂层相对PU涂层的耐腐蚀性能有显著提升,其中含PU/1.5%HNTs涂层的阻抗值达到8.0×10^(5)Ω·cm^(2),腐蚀电流密度降至(0.117±0.007)μA/cm^(2),缓蚀效率达到99.22%,浸泡30 d后涂层的阻抗值依然达到9×10^(4)Ω·cm^(2)。8-Hydroxyquinoline,a corrosion inhibitor,is encapsulated in elonite nanotubes by divalent copper ions,forming HNTs/8-HQ/Cu^(2+)which is added into a silicon-containing polyurethane coating(PU)to prepare a composite anti-corrosion coating that is coated on the surface of Q235 carbon steel.The morphology and structure of HNTs/8-HQ/Cu^(2+)are characterized through using Fourier transform infrared spectroscopy,thermogravimetric analysis,and transmission electron microscopy.In a 3.5%NaCl solution,the corrosion resistance of PU/HNTs containing 0%,0.5%,1%,1.5%,2%,and 2.5%of HNTs/8-HQ/Cu^(2+)is characterized by means of electrochemical impedance spectroscopy and Tafel polarization curves.Characterization results show that PU/HNTs coating has a significantly higher corrosion resistance than PU coating,of which PU/1.5%HNTs coating shows an impedance value of 8.0×10^(5)Ω·cm^(2),a corrosion current density of 0·117±0·007μA·cm^(-2),and a corrosion inhibition efficiency of 99·22%.The impedance value of the coating still reaches 9×10^(4)Ω·cm^(2)after 30 days of immersion.

关 键 词：防腐 埃洛石 缓蚀剂 含硅聚氨酯 复合涂层 

分 类 号：TG174.4[金属学及工艺—金属表面处理]