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Navid Keshmiri,Parisa Najmi,Mohammad Ramezanzadeh,Bahram Ramezanzadeh 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.117 No.-
The control over the in-situ growth of metal-organic framework (MOF) thin films on a metal surface isstill challenging. As an interesting subdivision of MOFs, the zeolite imidazole framework (ZIF) has beenthe research hotspot in various research areas, from separation to sensing in the form of nanocrystals,thin films, and membranes. Continuous thin films of ZIF crystals need binding sites for desirable heterogeneousnucleation. This study proposed a novel and facile surface treatment at room temperature basedon zinc-phosphate conversion coating to provide nucleation sites for the intergrown ZIF-8 crystals onmild steel as a corrosion protective layer. The successful growth of ZIF-8 crystals on the modified carbonsteel was characterized using FT-IR, Raman, GIXRD, XPS, and FE-SEM tests. This thin layer led to a superprotective barrier film for up to 10 days in a harsh corrosive environment of salt spray. On the other hand,EIS reported almost 100 kO.cm2 total resistance after 72 h immersion in 3.5% wt. NaCl solution which is agreat achievement compared to conventional primer coatings. The total resistance of an epoxy coatingwith the proposed primer was improved by 135% when there was a deep mechanical scratch in the coating. The ZIF-8 thin film could significantly improve the epoxy coating’s anti-corrosion ability. The goodnews is that this concept is transferable to other ZIF-based MOFs.
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