No abstract

No abstract

In this study, DBNs‐aminated layered double hydroxide (ALDH) was prepared by connecting ALDH with hydroxylated boron nitride nanosheet (OH–BNs) which was obtained by high‐temperature steam method from hexagonal boron nitride nanosheet (h‐BNs) through the polydopamine. DBNs‐ALDH was characterized by fourier‐transform infrared spectroscopy, x‐ray diffraction, scanning electron microscope, energy dispersive spectrometer, transmission electron microscope, Raman, and x‐ray photoelectron spectroscopy analyses to prove the success of the synthesis. Change of chloride ion concentration was chosen to evaluate the ion exchange function of DBNs‐ALDH. Then, the epoxy resin (EP) mixed with DBNs‐ALDH was coated on the Q215 steel to form a composite epoxy coating. The electrochemical impedance spectroscopy test and brine immersion test were used to characterize the anticorrosion performance of composite EP coating. The results revealed that the DBNs‐ALDH reinforced the anticorrosion performance of the EP coating.

Polyurethane is a promising topcoat in anticorrosive coating system. As a topcoat, the study on improving its weathering resistance is significative. In this work, we present an anticorrosive filler, named GOFA based on p‐fluoroaniline chemical modified graphene oxide, and explored the potential of GOFA to improve the weatherability and corrosion resistance of polyurethane coatings. The results of the comprehensive experimental studies showed that the addition of 0.5 wt.% GOFA leaded to an improvement in the hydrophobicity of the polyurethane coating and the composite coating exhibits an excellent shielding effect against corrosive media. At the same time, the ultraviolet aging resistance the GOFA modified polyurethane composite coating also showed satisfactory results. It is inspired that adding a small amount of GOFA can make the composite polyurethane coating have excellent anti‐corrosion performance and weather resistance.

No abstract