Rigid-flexible coupled 3D cross-linked network structure functional coating for corrosion resistance in harsh HPHT-CO2 environments

A novel three-dimensional cross-linked network structure is constructed in epoxy coatings through numerous chemical reactions within fillers and between filler and resin. The organic combination between fillers, resins and curing agents improves the coating compactness, the dense and stable "3D network" can effectively shield the CO 2 corrosion. Additionally, the excellent toughness of flexible Polyamide modified with polydopamine and the outstanding strength of rigid MoS 2 modified with KH560 significantly improve the wear resistance, impact resistance and thermal stability of coating. The EIS results obtain under CO 2 environments indicated the mixed coating impedance is approximately 1000 times higher than ordinary coating.