▎ 摘 要
Graphene oxide (GO) easily aggregates due to the cross-linking between divalent cations in the plating baths, and the presence of reduced GO in metal coatings promotes corrosion. This paper aims to improve the corrosion and wear resistance of Ni-W coatings by embedding graphene oxide modified with nano-Al2O3 nanoparticles (Al2O3@GO). Carboxylic acid groups were removed to eliminate cross-linking with divalent cations. Moreover, the increased number of hydroxyl groups ensured that Al2O3@GO was highly dispersed in the plating bath. Then, Ni-W-Al2O3@GO coatings were fabricated by pulse electrodeposition with different Al2O3@GO concentrations in the plating solution. The grain refinement, low number of defects, and low conductivity (1.31 Sm-1) of the reduced Al2O3@GO in the coating gave it anti-corrosion properties. The coating with 1 g L-1 of GO addition (Icorr = 0.195 mu A) displayed better corrosion and wear resistance properties than Ni-W coating (Icorr = 6.66 mu A), Ni-W-GO coating (Icorr = 0.706 mu A), and other Ni-W-Al2O3@GO coatings. The uniform distribution of Al2O3@GO in the coatings allowed it to serve as a physical barrier which eliminated electron pathways and prevented the infiltration of corrosive media. Moreover, the self-lubrication and similar "rolling" of Al2O3@GO increased the wear resistance of the coatings.