Achieving a high‐performance anti‐corrosive polyvinyl ester based on bisphenol a coating by addition of polyaniline‐Cu‐based metal organic framework composite

Abstract Corrosion of steel is one of the challenging issues that researchers has focused on it. Among corrosion control methods, organic coatings with suitable lifetime and efficiency are a great of interest. In the present research, polyaniline‐ copper‐based metal organic framework (PANI‐Cu‐MOF) is synthesized using in‐situ oxidation polymerization method and successfully characterized with different techniques. Then, 0.5, 1, and 1.5 wt. % of PANI‐Cu‐MOF composite are added to vinyl ester (VE) resin based on bisphenol A and coated on ST37 steel. The performance of the as‐prepared coatings on ST37 is evaluated using electrochemical impedance spectroscopy (EIS) for 360 h. The EIS results showed that loading of PANI‐Cu‐MOF (0.5 wt. %) in VE led to the highest protective properties against aggressive species with |Z| _{0.01 Hz} = 6.76 × 10 ⁷ Ωcm ² after 360 h. The uniform distribution of PANI‐Cu‐MOF composite in VE and its hydrophobic property causes a delay in the penetration of the corrosive species into the coating, thus increasing the corrosion resistance. Highlights PANI‐Cu‐MOF composite is embedded to VE resin as novel anti‐corrosive pigment. The highest R _coat are achieved for VE‐PANI‐Cu‐MOF 0.5 wt. %. In the presence of PANI‐Cu‐MOF, the corrosive species penetrations decreased.