Preparation and characterization of corrosion resistance of epoxy polysiloxane hybrid coatings cured by polyetheramines

The organic-inorganic hybrid coatings based on epoxy polysiloxane resin were prepared by using three different polyetheramines (Jeffamine D230, D400, T403). The mechanical, adhesion and anti-corrosion properties were compared with the hybrid coating cured by 3-aminopropyltriethoxysilane (APTES). Compared with the hybrid coatings cured by APTES, the impact resistance property, initial adhesion and “wet adhesion” of the hybrid coatings cured by polyetheramines were promoted, comparable hardness of the hybrid coatings cured by D230 and T403 were attained, while the hardness of hybrid coating cured by D400 was decreased. The corrosion resistance behavior of the hybrid coatings was thoroughly examined by electrochemical impedance spectroscopy (EIS) and salt spray tests. It was found that the cracking and corrosion resistance of the hybrid coatings cured by APTES were improved greatly by using polyetheramines hardeners.