ABSTRACT Polyaniline/graphene oxide (GON-An) composites were synthesized by chemically grafting p-phenylenediamine (PPDA)-modified graphene oxide (GO) with polyaniline (PANI), which was confirmed by FT-IR, XRD, SEM, TEM, Raman spectroscopy, and XPS analyses. The electrochemical impedance spectroscopy test, brine immersion, and Tafel slopes analysis revealed that compared with GO and PPDA-modified GO (GON), GON-An composites which combined the unique corrosion resistance of both PANI and GO exhibited relatively obvious superiority in improving the corrosion resistance of epoxy coating with the same contents. After being immersed in brine for 35 days, the composite epoxy coating containing 1 wt-% of GON-An(1:2) composites in which the mass ratio of GO and PANI was 1:2, possessed a high impedance of 4×109 Ω cm2, a high corrosion potential of −0.25 V, and a low corrosion current of 4.119×10−11 A cm−2. Furthermore, the anti-corrosive mechanisms of PANI/GO epoxy coatings were discussed.

中文翻译：

---

基于GON-An复合材料的优异防腐环氧涂层的制备

摘要 通过对苯二胺 (PPDA) 改性的氧化石墨烯 (GO) 与聚苯胺 (PANI) 进行化学接枝，合成了聚苯胺/氧化石墨烯 (GON-An) 复合材料，经 FT-IR、XRD、SEM、TEM、拉曼光谱证实光谱和 XPS 分析。电化学阻抗谱测试、盐水浸泡和塔菲尔斜率分析表明，与 GO 和 PPDA 改性的 GO（GON）相比，结合了 PANI 和 GO 独特耐腐蚀性能的 GON-An 复合材料在改善腐蚀方面表现出相对明显的优势。相同含量的环氧涂层的电阻。在盐水中浸泡 35 天后，含有 1 wt-% GON-An(1:2) 复合材料的复合环氧涂层，其中 GO 和 PANI 的质量比为 1:2，具有 4×109 的高阻抗Ω cm2，-0.25 V的高腐蚀电位，和 4.119×10-11 A cm-2 的低腐蚀电流。此外，还讨论了 PANI/GO 环氧涂层的防腐机制。