聚邻氯苯胺-纳米SiC/环氧树脂复合材料的制备与防腐性能

导电聚合物在金属腐蚀领域存在着潜在的应用前景。为获得防腐性能良好的聚邻氯苯胺(POCl)-nano SiC/环氧树脂复合材料,利用原位聚合法制备了盐酸掺杂态POCl-nano SiC复合改性材料。通过FTIR、UV-vis、XRD、TGA、XPS和SEM等分析手段对其结构、组成和形貌进行了表征。以POCl-nano SiC复合改性材料为填料,环氧树脂为成膜物质,在碳钢表面制备了POCl-nano SiC含量为3wt%、5wt%和8wt%的POCl-nano SiC/环氧树脂复合涂层,并通过SEM对涂层的断面形貌进行了观察。利用Tafel极化曲线和电化学交流阻抗谱研究了涂层在3.5%NaCl溶液中的防腐性能。结果表明,POCl-nano SiC填充量为5wt%的POCl-nano SiC/环氧树脂复合涂层表现出较好的抗腐蚀性能,其腐蚀速率为2.78×10-3 mm/y,腐蚀保护效率高达90.45%。表明适量的POClnano SiC作为环氧树脂涂层的增强相,降低了涂层的孔隙缺陷,在腐蚀介质刺激下,能够在碳钢表面形成钝化保护层。Nano SiC粒子在涂层中充当着类似栅栏结构的屏障,从空间结构上阻止了气体分子和腐蚀溶液向金属基底的渗透。

Preparation and anticorrosion performance of poly(o-chloroaniline)-nano SiC/epoxy resin composite

Conducting polymers represent a promising application prospect in the field of metal corrosion control.In order to obtain a poly(o-chloroaniline) (POCl)-nano SiC/epoxy resin composite with good anticorrosion performance,hydrochloric acid doped POCl-nano SiC composite modified material was prepared by in situ polymerization method.The structure,composition and morphology of the POCl-nano SiC composite were characterized by FTIR,UV-vis,XRD,TGA,XPS and SEM.The POCl-nano SiC composite modified material was used as the filler,and epoxy resin was used as the film forming substance,hydrochloric acid doped POCl-nano SiC/epoxy resin composite coatings with 3wt%,5wt% and 8wt% POCl-nano SiC contents were prepared on the carbon steel substrates,and the fracture surface morphologies of the coatings were observed by SEM.Its anticorrosion performances were studied by Tafel polarization curve and electrochemical impedance spectroscopy in 3.5% NaCl solution.The results demonstrates that the POCl-nano SiC/epoxy resin composite coatings whose POCl-nano SiC content is 5wt% shows better anticorrosion performance,with a corrosion rate of 2.78×10-3 mm/y and the corrosion protection efficiency up to 90.45%.It indicates that the proper amount of POCl-nano SiC as the reinforcing phase of the epoxy resin coating would reduce the pinhole defects of the coating,under the infiltration of corrosion medium,a passivation layer formed on the surface of carbon steel.Nano SiC particles act as a barrier,which was analogous to the fence structure and blocked the penetration of gas molecules and corrosion solution toward metal substrate spatial structurally.