二氧化硅改性环氧涂层的制备及其对钢筋的防护性能研究OA

To enhance the comprehensive performance of epoxy resin(EP)coatings in steel reinforcement protection,this study addressed issues such as high brittleness,high porosity,and weak interfacial bonding.Nano-SiO2(NH2-SiO2)was modified by γ-aminopropyl triethoxysilane(γ-APS)to prepare amino functional nano-SiO2,which was introduced into epoxy resin to prepare NH2-SiO2/EP composite coating.FTIR,TGA,and XPS analyses confirm successful modification:amino functional groups are successfully grafted on the surface of SiO2 by chemical bonding,improving dispersion and interfacial compatibility of nanoparticles in epoxy matrix.SEM and EDS analysis reveal optimal coating density with uniform particle distribution at 3%(mass fraction)NH2-SiO2 content.Research indicates that the 3%-NH2-SiO2/EP composite coating exhibits approximately 75%higher tensile strength than pure epoxy resin,and the maximum load is 2.2 kN;while reducing coefficient of friction from 0.97 to 0.77,demonstrating significant wear resistance improvement.Electrochemical impedance spectroscopy(EIS)results indicate that the coating maintained impedance modulus is still above 1×1011 Ω·cm² after 3 d immersion in 3.5%NaCl concrete simulated corrosion solution,showing excellent corrosion resistance.This study provides a theoretical basis for design and application of anti-corrosion coating for high performance steel bars.