In this study, the ferrocene modified polyaniline [P(FcA-co-ANI)] with tunable electrical conductivity was prepared by introducing ferrocene groups into the main chain of polyaniline (PANI) with a hydrochloric acid dopant. The ¹H NMR, SEM, XRD and FT-IR results proved the successful preparation of the copolymers P(FcA-co-ANI). The corrosion resistance of the coatings on Q215 steel was investigated by EIS. The results showed that the P(FcA-co-ANI)/EP coatings and PANI/EP coatings all improved the long-term corrosion resistance by more than 2 orders of magnitude with comparison of EP coatings. Both coatings showed excellent corrosion inhibition. Furthermore, the |Z|_{0.01 Hz} values of the P(FcA-co-ANI)/EP coating started to recover in a shorter period of time and returned to higher values compared to the PANI/EP coating, and did not drop as sharply as the PANI/EP coating in the later stages of immersion. Besides, the results of R_c and R_ct values also show that the P(FcA-co-ANI)/EP coatings provide faster and better corrosion inhibition. This is due to the greater conductivity P(FcA-co-ANI) being more sensitive to the electrons generated by metal corrosion and so generating the passivation layer faster. The impact and peel tests show excellent mechanical properties and adhesion of the coating. This work offers some theoretical help for understanding the anticorrosion mechanism of PANI.

在这项研究中，通过将二茂铁基团引入具有盐酸掺杂剂的聚苯胺（PANI）的主链中，制备了具有可调电导率的二茂铁改性聚苯胺[P（FcA- co -ANI）]。1 H NMR、SEM、XRD和FT ^- IR结果证明了共聚物P(FcA-co-ANI)的成功制备。采用 EIS 研究了 Q215 钢上涂层的耐腐蚀性能。结果表明，与EP涂层相比，P(FcA-co-ANI)/EP涂层和PANI/EP涂层的长期耐腐蚀性能均提高了2个数量级以上。两种涂层都表现出优异的缓蚀性。此外，|Z| _0.01赫兹与 PANI/EP 涂层相比，P(FcA-co-ANI)/EP 涂层的值在更短的时间内开始恢复并恢复到更高的值，并且没有像 PANI/EP 涂层那样急剧下降沉浸的后期。此外，R _c和R _ct值的结果还表明，P(FcA-co-ANI)/EP 涂层提供更快更好的缓蚀性。这是由于更大的电导率 P(FcA-co-ANI) 对金属腐蚀产生的电子更敏感，因此更快地生成钝化层。冲击和剥离试验表明涂层具有优异的机械性能和附着力。该工作为理解PANI的防腐机理提供了一定的理论帮助。