▎ 摘　　要

NOVELTY - Preparation dopamine-based gallium-graphene oxide composite coating on zinc surface comprises (i) sequentially pretreating the surface of the zinc substrate and then subjecting to alkali heat treatment, (ii) soaking the alkali-heat-treated zinc substrate in the gallium nitrate solution to obtain gallium-loaded coating sample marked with zinc/gallium, (iii) dissolving dopamine hydrochloride in trihydroxyaminomethane solution, making the concentration of the solution to 1-3 g/l, adjusting pH to 8.5, magnetically stirring under aerobic room temperature conditions and protection of light, soaking for 24 hours to form polydopamine film, soaking the obtained gallium-bearing zinc sheet in the dopamine solution to obtain gallium-dopamine coated samples marked with zinc/gallium/ polydopamine, and (iv) adding the gallium-dopamine coating sample at 37 degrees C into 1-6 g/l graphene oxide solution, and soaking for 24 hours to obtain final product. USE - The method is useful for preparing dopamine-based gallium-graphene oxide composite coating on zinc surface. ADVANTAGE - The method has improved comprehensive performance, synergistically high efficiency and antibacterial effect and reduced infection of zinc in human body; slows down the degradation rate of zinc flakes and reduces the degradation rate of zinc.