Erosion-corrosion resistance of Ni-Al layered double hydroxides/graphene oxide composite coatings

In present study, the layered double hydroxides (LDHs) coatings on aluminum alloys were prepared by a gentle hydrothermal reaction and modified with graphene oxides (GO) for the corrosion mitigation of aluminum alloys under flowing conditions in marine environments. SEM, XRD, FT-IR, and XPS analysis results indicate that the LDHs/GO coatings have been successfully fabricated. The polarization resistance experiences oscillation with no obvious distinction on bare aluminum alloys under static and flowing conditions. Instead, it is rapidly reduced on the specimen surface with LDHs coating during the testing period. The incorporation of GO could considerably enhance the corrosion resistance under stagnant and flowing conditions, with slight drop of polarization resistance in dynamic environments during the testing duration. The disruption and shearing effect of turbulent flow along with the violent impingements of sands expedites the degradation of LDHs/GO coatings. Our work could provide the insight into the erosion-corrosion resistance ability of LDHs/GO coatings in practical marine application equipments.