An epoxy resin composites with excellent thermal stability and acid corrosion resistance modified by glass flake and polyurethane

Purpose The purpose of this study is to develop an organic coating to mitigate the corrosion of exhaust gas fans in acid regeneration processes. Design/methodology/approach In this research, a composite modified epoxy resin (F-GF/EP-PU) coating was prepared using epoxy resin (EP) as the base material, polyurethane prepolymer (PU) as the modifier and functionalized glass flake (F-GF) as the filler. The modification effect, thermal stability and mechanical properties of F-GF/EP-PU composites were evaluated by Fourier transform infrared, thermogravimetric analysis and tensile testing, respectively. The corrosion resistance of F-GF/EP-PU coating was evaluated by electrochemical impedance spectroscopy. Findings The combination of PU and F-GF enhances the mechanical properties, thermal stability and acid corrosion resistance of the F-GF/EP-PU coating. After 21 days of immersion in an 80°C solution containing 1 Wt.% HCl and 3.5 Wt.% NaCl, the low-frequency impedance of the coating remains above 10¹° O·cm2, indicating its excellent protective capabilities. Originality/value This study simulates harsh conditions in actual working environments, and the coating exhibits excellent protective capabilities in harsh environments.