Enhanced Anti‐Corrosion Performance of Carbon Steels via CeO2@BNNSs/Epoxy Resin Composite Coatings

Abstract

AbstractDue to its excellent physical barrier behavior and high physicochemical stability, hexagonal boron nitride (h‐BN) can improve the anti‐corrosion capacity of a favorite protective coating onto metals. However, the poor dispersion of h‐BN filler in the formation of polymer composites does not promote its further wide application in the field of corrosion protection. In this work, a new CeO2@BNNSs filler is highly dispersed into aqueous epoxy (EP) to make nice coatings onto steels. As a result, after immersing them into an NaCl solution of 3.5 wt% for 20 days, the as‐prepared CeO2@BNNSs/EP composite coatings can keep an impedance modulus (|Z|f = 0.01 Hz) value of 9.61 × 107 Ω cm2, which is larger than those of the blank EP and the EP filled with the h‐BN and BNNSs fillers. In addition, compared to the EP, h‐BN/EP, and BNNSs/EP coatings, the higher corrosion potential, the properties of larger polarization resistance, and lower corrosion current density for the CeO2@BNNSs/EP coatings indicate CeO2@BNNSs/EP's excellent protective ability to the steel from corrosion. It is believed that this kind of CeO2@BNNSs/EP composite materials and its coatings would be highly promising for application in future advanced anti‐corrosion environments and devices.