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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%。
Aniline monomer as raw material, ammonium persulfate as oxidant, prepared by chemical oxidation of the intrinsic state of polyaniline, and its nano-CaCO3 by solution blending prepared polyaniline / CaCO3 composite. The morphology and structure of polyaniline / CaCO3 composite were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), UV-Vis and infrared spectroscopy (IR) Polyaniline and polyaniline / CaCO3 composite as filler, respectively, were added to the epoxy resin (EP) / polyamide curing agent system, prepared on the surface of carbon steel EP / polyaniline and EP / polyaniline / CaCO3 composite coating , The carbon steel specimens of EP steel, EP / polyaniline coating and EP / polyaniline / CaCO3 composite coating were comparatively studied by electrochemical methods such as open circuit potential, polarization curve and AC impedance spectroscopy in 3.5 % NaCl solution immersed in different times of corrosion behavior. The results show that the polyaniline film is better coated on the surface of CaCO3 nanoparticles. The addition of CaCO3 enhances the densification of the coating and enhances the adhesion of polyaniline molecules to the metal matrix. Epoxy coating containing polyaniline / nano-CaCO3 composite has the strongest corrosion resistance, followed by the epoxy / polyaniline coating; the corrosion potential of EP / polyaniline / CaCO3 composite coatings is positive At 59 mV, the corrosion current density was reduced by 63%.