Bio-inspired ZIF-8-based composite coating with anti-corrosion and anti-UV performance: The methods of combining experiments with theoretical calculations

作者：Chengbin Guo, Hua Shen, Miao Dou, Zhenyu Chen · 发表于：Surface and Coatings Technology · 年份：2025 · DOI：10.1016/j.surfcoat.2025.132502 · 被引用次数：6 · 研究领域：Magnesium Oxide Properties and Applications、Silicone and Siloxane Chemistry、Advanced Photocatalysis Techniques

Enhancing the service life of epoxy coating in marine environments can be effectively achieved through multifunctional coatings that combine anti-UV and active protection. In this study, we developed a smart release system based on a zeolitic imidazolate framework-8 (ZIF-8) loaded with benzotriazole (BTA) and O-nitrobenzaldehyde (O-NBA), and subsequently coated with a metal–polyphenol network (MPN). This system, denoted as ZBOM (ZIF-8@BTA@O-NBA@MPN), exhibits free radical scavenging capabilities along with pH- and UV-responsive release behavior. Incorporating 1 wt% ZBOM into the epoxy matrix resulted in uniform nanoparticle dispersion and significantly improved mechanical performance, yielding a tensile strength of 26.90 MPa. Density functional theory (DFT) calculations have confirmed the presence of intermolecular interactions between ZBOM and epoxy resin units. After 90 days of immersion, the EP/ZBOM exhibited a superior anti-corrosion performance (1.7 × 10 9 Ω·cm 2 ) compared to the pure EP coating (3.5 × 10 6 Ω·cm 2 ). Furthermore, molecular dynamics simulations indicated that ZBOM nanofillers enhance the diffusion resistance of corrosive ions within the coatings. The pH/UV-triggered active protective capability of the composite coating was further corroborated by localized electrochemical impedance spectroscopy (LEIS) and SEM/EDS measurements. Following 300 h of UV aging treatment, the resistance value of the composite coating (1.7 × 10 8 Ω·cm 2 ) was found to be approxi...