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Development of an active/barrier bi-functional anti-corrosion system based on the epoxy nanocomposite loaded with highly-coordinated functionalized zirconium-based nanoporous metal-organic framework (Zr-MOF)

Ramezanzadeh, M ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1016/j.cej.2020.127361
  3. Publisher: Elsevier B.V , 2021
  4. Abstract:
  5. For the first time, the UIO-66, NH2-UIO, and NH2-UIO particles covalently functionalized by Glycidyl Methacrylate (GMA@NH2-UIO), were utilized as the novel functional anti-corrosive fillers. The functionality, high surface area, phase composition, excellent thermal properties as well as chemical stability of the Zr-MOFs were proved by FT-IR, BET, XRD, TGA, and water stability tests, respectively. The smart pH-sensitive controlled-release activity of the corrosion inhibitors (i.e., Zr ions and organic compounds) from the prepared Zr-MOFs was proved by the water stability test of the Zr-MOFs particles in the acidic (pH = 2), neutral (pH = 7.5), and alkaline (pH = 12) solutions containing 3.5 wt% sodium chloride. The active inhibition properties of the Zr-MOFs were obtained in saline solution by two methods of (i) the solution phase and (ii) scratched epoxy coated samples containing Zr-MOFs by Tafel polarization method and EIS analysis. According to the EIS data, the excellent barrier (passive) properties of the composite film filled with GMA@NH2-UIO particles (G-UIN/EP) were proved by the highest impedance level at the lowest f (frequency) (log (|Z|10 mHz = 9.86 Ω.cm2), the lowest value of the breakpoint frequency (log (fb) = −1.42 Hz) and the highest coating undamaged index (85.93%) after 120 h of immersion. The salt spray (accelerated corrosion test) test (SST), pull-off (testing the strength of adhesion), and cathodic disbonding test (CDT) experiments showed excellent interfacial-adhesion properties of the G-UIN/EP sample in two dry (unexposed) and wet conditions. The hardness test showed that through the incorporation of the UIO, UIN, and G-UIN particles into the epoxy coating, the hardness, and scratch-resistance of the coating were notably improved. © 2020 Elsevier B.V
  6. Keywords:
  7. Acrylic monomers ; Adhesion ; Alkalinity ; Atmospheric corrosion ; Chemical stability ; Coatings ; Composite films ; Electrochemical corrosion ; Epoxy resins ; Gas metal arc welding ; Hardness ; Metal-Organic Frameworks ; Organometallics ; Scratch resistance ; Seawater corrosion ; Sodium chloride ; Zirconium metallography ; Accelerated corrosion tests ; Anti-corrosion systems ; Cathodic disbonding ; Epoxy nanocomposites ; Glycidyl methacrylate ; Inhibition property ; Interfacial adhesions ; Tafel polarization ; Zirconium compounds
  8. Source: Chemical Engineering Journal ; Volume 408 , 2021 ; 13858947 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S1385894720334859