以苯胺单体为原料、过硫酸铵为氧化剂，采用化学氧化法制备了本征态聚苯胺，将其与纳米CaCO3通过溶液共混法制备了聚苯胺/CaCO3复合物。采用扫描电镜(SEM)、X射线衍射(XRD)、紫外-可见光谱(UV-Vis)和红外光谱(IR)对聚苯胺/CaCO3复合物进行了形貌观察和结构表征。分别以聚苯胺、聚苯胺/CaCO3复合物为填料，加入到环氧树脂(EP)/聚酰胺固化剂体系中，在碳钢表面制备了EP/聚苯胺和EP/聚苯胺/CaCO3复合涂层，通过开路电位、极化曲线和交流阻抗谱等电化学方法对比研究了裸钢以及含 EP 涂层、EP/聚苯胺涂层、EP/聚苯胺/CaCO3复合涂层的碳钢试片在3.5% NaCl溶液中浸泡不同时间的腐蚀行为。结果表明，聚苯胺膜较好地包覆在CaCO3纳米粒子表面；CaCO3的加入增强了涂层的致密性，提高了聚苯胺分子对金属基体的粘附力。含有聚苯胺/纳米CaCO3复合物的环氧涂层具有最强的抗腐蚀能力，其次为环氧/聚苯胺涂层；两者相比，EP/聚苯胺/CaCO3复合涂层的腐蚀电位正移了59 mV，腐蚀电流密度降低了63%。
The eigenstate polyaniline (PANI) was prepared by chemical oxidation method using aniline monomer as raw material and ammonium persulfate as oxidant, and then mixed with nano-CaCO3 in solution to prepare a PANI/CaCO3 composite. The morphology and structure of the polyaniline/CaCO3 composite were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), ultraviolet-visible (UV-Vis) spectroscopy, and infrared (IR) spectroscopy. The epoxy (EP)/PANI and EP/PANI/CaCO3 composite coatings were prepared on the surface of carbon steel by adding PANI and PANI/CaCO3 as filler respectively to epoxy resin with polyamide curing agent.The corrosion behaviors of the carbon steel uncoated and coated with EP, EP/PANI, and EP/PANI/CaCO3 coatings respectively in 3.5% NaCl solution for different time were comparatively studied by electrochemical methods such as open circuit potential measurement, polarization curve measurement, and alternating current impedance spectroscopy. The results indicated that the surface of CaCO3 nano particles is well coated by PANI film. The addition of nano-CaCO3 improves the compactness of coating and the adhesion of PANI molecular to metal substrate. The epoxy coating containing PANI/CaCO3 composite has the best anticorrosion performance, followed by the EP/PANI coating. The EP/PANI/CaCO3 composite coating has a corrosion potential shifted positively by 59 mV, and a corrosion current density decreased by 63%as compared with the EP/PANI coating.
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