UV-catalytic fillers with hydrophilic groups encapsulating hydrophobic groups enhance the corrosion resistance of epoxy coatings in harsh environments

Abstract

In recent years, the impact of filler surface groups on the protective qualities of epoxy resin coatings has garnered significant attention. This study has centered on the hydrophobic modification of mica fillers using fluorosilane (PFDTMS). Subsequently, the photocatalytic properties of titanium black (B-TiO₂) and Cobalt tetroxide (Co₃O₄) were utilized to deposit hydroxyl radicals onto the fluorosilane surface, resulting in a configuration where hydrophilic groups encapsulate hydrophobic groups on the exterior of the filler. Furthermore, the study aimed to evaluate the anti-corrosion and wear resistance of these composite coatings under high-pressure CO₂ conditions. After undergoing a 72-hour high-pressure CO₂ corrosion test, the EP/UV-F/B-TiO₂/Mica/Co₃O₄ composite coating retained a substantial impedance modulus value of 3.648 × 10⁹ Ω/cm² at 0.01 Hz, whereas the pure epoxy resin coating exhibited detachment and cracking from the substrate. These observations indicate that the epoxy composite coating, featuring its distinctive hydrophilic-hydrophobic configuration, possesses exceptional long-term corrosion resistance. In conclusion, this research presents encouraging prospects for the development of mica-based, resilient anti-corrosive fillers.