Abstract: In order to prepare epoxy coatings with high performance a conductive polyani-line was chosen as anticorrosive filler and coatings formulations were optimized via orthogonal experiment. Dynamic potential polarization curves and electrochemical impedance techniques were adopted to discuss the effects of immersion temperature, immersion time and carbon diox-depressure, etc. on the electrochemical properties of the film. Experimental results showed that the optimized formulation of epoxy coatings comprised epoxy coatings 36. 90wt %, polyan-iline 0. 37wt %, polyamide 29. 52wt %, and other fillers 33.21wt%. The cured film showed the adhesion 1 grade, hardness 6H and impact resistance 41 cm. With the increase of immer-sion time, the corrosion rate of the film firstly increased and then decreased. In addition,the immersion temperature rising from 35℃ to 80 ℃ could result in a faster corrosion rate. At the presence of 1 g/L sodium sulfide and carbon dioxide with 7 Mpa, the sulfide corosion on sur-face of the coated sample occurred primarily.

Key words: polyaniline, epoxy resin, modification, coatings, anticorrosion

摘要： 为了制备性能优异的环氧涂料，选择导电聚苯胺（PANI）作为防腐填料，通过正交实验筛选了涂料配方；运用交流阻抗讨论了浸泡温度、时间和 CO₂ 分压等因素对涂层电化学性能的影响。 实验结果表明：筛选出的涂料配方为环氧树脂含量 36.90%（质量分数，下同）、聚苯胺含量为 0.37%、聚酰胺含量为 29.52%、其他填料含量为 33.21%时所制得的涂层附着力为 1 级、硬度为 6h、耐冲击性为45cm；随着浸泡时间的增加，涂层的腐蚀速率先增加后减小；浸泡温度从 35 ℃ 升高到 80 ℃ 时，涂层的腐蚀加剧；在 7 MPa CO₂ 和 1 g/L 硫化钠条件下，涂层主要发生的是硫离子腐蚀。

关键词: 聚苯胺, 环氧树脂, 改性, 涂料, 耐腐蚀性