Designing sandwich-structured IBP nanosheets with superior antioxidant property to enhance corrosion resistance, flame retardancy, and wear resistance for polymeric coatings

The rapid development of industrialization requires the advancement of multifunctional coatings. In this study, successful self-assembly of iron porphyrin on BP nanosheets resulted in the synthesis of IBP nanosheets with a sandwich structure. Characterization tests including SEM, XPS, SPM, and XRD confirmed the successful preparation of IBP nanosheets with robust structural stability and antioxidation. Subsequently, a water-based epoxy resin (WEP) coating containing IBP nanosheets was prepared. Test results revealed that the composite coating containing 0.4 wt.% IBP nanosheets exhibited outstanding anti-corrosion, wear-resistant, and flame-retardant properties. After 42 days of immersion in a 3.5 wt.% NaCl solution, the R_ct value of the 4-IBP/WEP coating was 1.79 × 10⁹ Ω cm², surpassing the Pure WEP coating by more than 3 orders of magnitude. Additionally, the peak heat release rate (PHRR) and wear rate of the 4-IBP/WEP coating decreased by 19.29% and 90.97% compared to the Pure WEP coating. This research presents a novel idea for the utilization of BP nanosheets in multifunctional coatings.