Novel Zinc Phosphate Assembled Metal-Organic Frameworks Thin Films With Superior Interfacial Bonding and Anti-Corrosion Properties

Metal-organic frameworks (mofs), with unique crystallinity and porosity, have fascinated much notice in many applications. the metallic ions, coordination chemistry, and accessible porosities have made them excellent candidates for anti-corrosion polymer nanocomposites either as corrosion inhibitors or nanocontainers. however, in corrosion science, mofs have not been employed as thin films yet. thus, in this study, we introduced a novel synthesis method for applying a ph-responsive thin film of zif-8 on carbon steel for the first time. the carbon steel was modified using a zinc phosphate conversion coating to provide a rough surface and a zinc-rich source as binding sites for well-intergrown mof particles. the successful synthesis of zif8 crystals on the modified carbon steel was characterized using ft-ir, raman, gixrd, and fe-sem-edx tests. the thin layer of zif8 crystals led to a super protective barrier film with more than 300 kω.cm2 resistance at the first hours of immersion in saline media. the polarization test reported 97.2% corrosion inhibition performance of zif8 thin film compared with the zinc phosphate coating. plus, the zif8 layer was coated with an epoxy coating, and an artificial defect was made for active protection evaluation. the eis and salt spray outcomes showed superior active corrosion protection of the zif8 thin film as a primer. the total resistance of zph-zif8/ep was improved 135% relative to the blank/ep sample.

Novel Zinc Phosphate Assembled Metal-Organic Frameworks Thin Films with Superior Interfacial Bonding and Anti-corrosion Properties

Metal-Organic Frameworks (MOFs), with unique crystallinity and porosity, have fascinated much notice in many applications. The metallic ions, coordination chemistry, and accessible porosities have made them excellent candidates for anti-corrosion polymer nanocomposites either as corrosion inhibitors or nanocontainers. However, in corrosion science, MOFs have not been employed as thin films yet. Thus, in this study, we introduced a novel synthesis method for applying a pH-responsive thin film of ZIF-8 on carbon steel for the first time. The carbon steel was modified using a zinc phosphate conversion coating to provide a rough surface and a zinc-rich source as binding sites for well-intergrown MOF particles. The successful synthesis of ZIF8 crystals on the modified carbon steel was characterized using FT-IR, Raman, GIXRD, and FE-SEM-EDX tests. The thin layer of ZIF8 crystals led to a super protective barrier film with more than 300 kΩ.cm2 resistance at the first hours of immersion in saline media. The polarization test reported 97.2% corrosion inhibition performance of ZIF8 thin film compared with the zinc phosphate coating. Plus, the ZIF8 layer was coated with an epoxy coating, and an artificial defect was made for active protection evaluation. The EIS and salt spray outcomes showed superior active corrosion protection of the ZIF8 thin film as a primer. The total resistance of ZPH-ZIF8/EP was improved 135% relative to the Blank/EP sample.