Effect of Double-claw Silane Pretreatment on Properties of Epoxy Coating with Low Surface Treatment
In order to solve the problem of low adhesion and poor corrosion resistance of epoxy coating on the surface of low surface treated substrate,a bis(3-(triethoxysilyl)propyl)amine coupling agent solution with 6 different concentrations was used to pretreat the surface of St2 polished steel plate and equipped with epoxy coating.The reaction process was analyzed by FT-IR and XPS,while the interfacial adhesion and electrochemical properties of the coating system were tested.The experimental results revealed that the formation of Si—O—Fe bonds,which occur through the reaction between silanol groups generated by the hydrolysis of bis-(3-triethoxysilylpropyl)silane and the active hydroxyl groups on the steel plate surface,is crucial for enhancing coating adhesion and corrosion resistance.Notably,a silane concentration of 7.5％achieved optimal pretreatment outcomes,with the coating adhesion improving 1.5 times to 18.2 MPa compared to the untreated coating.Additionally,the coating system immersed in seawater for 1 000 hours exhibited a more positive open-circuit potential and an electrochemical impedance value of 1011 Ω·cm2,demonstrating a single capacitive arc feature and superior corrosion medium barrier properties.
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