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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。
Conductive polymers have potential applications in the field of metal corrosion. In order to obtain poly-o-chloroaniline (POCl) -nano SiC / epoxy composite with good corrosion resistance, a POCl-nano SiC composite modified by hydrochloric acid was prepared by in-situ polymerization. Its structure, composition and morphology were characterized by FTIR, UV-vis, XRD, TGA, XPS and SEM. Using POCl-nano SiC composite modified materials as filler and epoxy resin as film-forming materials, POCl-nano SiC / epoxy composite with POCl-nano SiC content of 3wt%, 5wt% and 8wt% The coating was observed and the cross-sectional morphology of the coating was observed by SEM. The corrosion resistance of the coating in 3.5% NaCl solution was studied by Tafel polarization curve and electrochemical impedance spectroscopy. The results show that POCl-nano SiC / epoxy composite coating with POCl-nano SiC loading of 5wt% shows good corrosion resistance with corrosion rate of 2.78 × 10-3 mm / y and corrosion protection efficiency up to 90.45%. It shows that the proper amount of POClnano SiC as reinforcing phase for epoxy coating reduces the porosity defects of the coating and can form a passivation layer on the surface of the carbon steel under the stimulation of corrosive medium. Nano SiC particles act as a barrier to fence-like structures in the coating, preventing spatial and structural infiltration of gas molecules and etching solutions into the metal substrate.