Enhancement of the anti-corrosion performance of composite epoxy coatings in presence of BTA-loaded copper-based metal-organic frameworks

Abstract

This study reports a new strategy for enhancing anti-corrosion properties of epoxy coatings. For this purpose, copper-based metal-organic frameworks (Cu-MOF) were applied as hosts of corrosion inhibitor (benzotriazole, BTA). The BTA-Cu-MOF was characterized using Infrared spectroscopy (FTIR), Thermogravimetric analysis (TG) and X-ray diffraction (XRD). Furthermore, the BTA loading in MOFs was determined by UV-vis and TGA. And MOFs were well dispersed in epoxy resin which was confirmed by SEM and XRD. Compared to the pure epoxy coatings, epoxy coating including BTA-Cu-MOF had greater radius of impedance arc via the electrochemical impedance spectroscopy (EIS) and higher water contact angle, which revealed the samples enhanced corrosion resistance of pure epoxy coatings. At the same time, the corrosion protection performance of epoxy coating with 2 wt% BTA-Cu-MOF were preferable than other coatings.