改性Ce-MOF/环氧纳米复合涂层的制备和性能研究OA

To enhance the protective performance of epoxy coatings on steel,a cerium-based metal-organic framework(Ce-MOF)was synthesized.The as-prepared Ce-MOF was sequentially treated with benzotriazole(BTA)and cationic polyacrylamide(CPAM)to yield a modified Ce-MOF(BTA@Ce-MOF@CPAM).Incorporation of this hybrid into an epoxy resin afforded a BTA@Ce-MOF@CPAM/epoxy nanocomposite coating.The pristine and modified Ce-MOFs were characterized by scanning electron microscopy,transmission electron microscopy,zeta-potential measurements and X-ray diffraction,while nitrogen adsorption was employed to analyze their pore structure.Electrochemical impedance spectroscopy revealed that the addition of 3%modified Ce-MOF significantly improved the self-healing capability of mechanically damaged epoxy films.After immersion in 3.5%NaCl aqueous solution for 48 h,the impedance modulus(|Z|0.01 Hz)at 0.01 Hz of the modified Ce-MOF/epoxy nanocomposite coating increased from 2.4×103 Ω·cm2 for the pure epoxy coating to 3.4×104 Ω·cm2.The coating hardness and friction-wear performance test results indicated that CPAM encapsulation facilitated the improvement of physical barrier performance against corrosive media and anti-mechanical damage performance of the nanocomposite coating.