Bifunctional oxygen-vacancy abundant perovskite nanosheets for improving protective performance of epoxy coatings

Reasonable design, preparation and application of efficient additives with controllable morphology are of the topical challenge for significantly improving their protective performance. Herein, bifunctional oxygen-vacancy abundant perovskite nanosheets, an efficient additive for improving coating’s protective performance, were prepared and used to develop the high performance protective coating. Bifunctional oxygen-vacancy abundant perovskite nanosheets transport oxygen to the metal surface through oxygen vacancies to promote the formation of a passivation layer, and the sheet structure hinders the penetration of other corrosive media. Meanwhile, the prepared coatings with the high protective performance were evaluated by immersion the samples in 12 wt% NaCl solution at 95 °C and characterized by electrochemical impedance spectroscopy (EIS). The experimental results demonstrate that the coatings containing 1 wt% perovskite nanosheets have the protection capability over 80 days, which impedance value exceeds 10 10 Ω cm 2 . The proposed strategy should be a universal pathway to improve the protective performance of coatings.