A polyurethane coating using CoMOF-BTA metal-organic framework for active protection of AA2024-T3

CoMOF-BTA, a new metal-organic framework with inherent corrosion inhibition ability was prepared via a one-step solvothermal process and characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and thermal analyses. Immersion and polarization tests were conducted to evaluate the ability of CoMOF-BTA to resist corrosion on AA2024-T3 alloy in NaCl solution. In addition, CoMOF-BTA particles were incorporated into polyurethane coatings to produce active anti-corrosion coatings, whose corrosion protection capabilities were assessed using electrochemical methods and salt spray analysis.

Event Tip: Anticorrosive Coatings

What principles determine the corrosion of metals and how can protective coatings help to prevent corrosion? In this tutorial, the basics of electrochemical processes will be explained, and typical ingredients and formulation features of corrosion protection coatings will be presented and discussed. We will answer these questions online on 05 Sep 2024 in the EC Short Course “Introduction to Anticorrosive Coatings”.

The impedance results show that polyurethane coatings containing CoMOF-BTA have coating resistances (Rcoat) that are around two orders of magnitude higher than that without the CoMOF-BTA particles. The salt spray analysis also indicates the corrosion protection ability of coatings containing CoMOF-BTA particles after a long period of exposure. The results demonstrate that CoMOF-BTA improved the ability of AA2024-T3 to resist corrosion and confirm the anti-corrosion properties of CoMOF-BTA-laden coatings by the controlled release of BTA molecules in NaCl solution. This study offers a new anti-corrosion MOF material and active coating for the protection of aluminum alloys against corrosion.

Journal of Coatings Technology and Research, Volume 21, pages 521–535, (2024)