▎ 摘　　要

A new N-(hydroxymethyl)acrylamide (HAM) cross-linked graphene oxide (NGO) has been fabricated through in situ polymerization of HAM in nano-graphene oxide (GO) sheets in order to improve the dispersibility in the matrix. NGO/epoxy resin composite coatings were successfully coated on magnesium alloy AZ31. The morphological characteristics of the GO sheets were detected by field-emission scanning electron microscopy. FTIR, XRD, and XPS tests provided a valuable support of the successful grafting of poly(N-(hydroxymethyl)acrylamide). The corrosion resistance of the NGO/epoxy composite coating has been evaluated, showing that its efficiency increased more than orders of magnitude, compared to that of the uncoated substrate. NGO could effectively improve the performance of film-forming of coatings, and formed a compact and smooth surface. The excellent super-hydrogen bonded structure in coatings and an outstanding barrier effect of the NGO sheets further facilitated the resistance to corrosion media.