▎ 摘　　要

NOVELTY - Preparation of doped graphene self-assembled composite film on aluminum alloy surface involves removing an aluminum layer on the surface of the aluminum alloy using sodium hydroxide solution, smoothly polishing with abrasive paper, ultrasonically cleaning with analytically pure ethanol, ultrasonically shaking in deionized water, etching with a hydrofluoric acid solution, washing, drying to obtain treated aluminum alloy, preparing a solution containing absolute ethanol, (( gamma )-triethoxysilylpropyl) tetrasulfide, polyethylene glycol 200 and potassium sulfide aqueous solution, adjusting the pH of the solution with acetic acid, stirring the solution in a magnetic stirrer, adding reduced graphene, ultrasonically dispersing to prepare a mixed solution, immersing the treated aluminum alloy in the mixed solution, taking out, ultrasonically cleaning in deionized water to remove unreacted small molecules and solvents on the aluminum alloy, and solidifying in a vacuum oven. USE - Preparation of doped graphene self-assembled composite film on aluminum alloy surface. ADVANTAGE - The film has high electrochemical impedance and low corrosion current density. DETAILED DESCRIPTION - Preparation of doped graphene self-assembled composite film on aluminum alloy surface involves removing an aluminum layer on the surface of the aluminum alloy using sodium hydroxide solution with the concentration of 30-60 g/L, smoothly polishing with 600#, 1000# and 1200# abrasive paper, ultrasonically cleaning with analytically pure ethanol for 5-15 minutes, ultrasonically shaking for 5-30 minutes in deionized water, etching for 5-30 minutes with a hydrofluoric acid solution having a concentration of 2-6 mol/L, again etching for 10-30 minutes in a hydrochloric acid solution having a concentration of 2-10 mol/L, washing 2-3 times with deionized water, drying at 80-120 degrees C to obtain treated aluminum alloy, preparing a solution with a total volume of 23-100 mL containing 20-65 mL absolute ethanol, 1-5 mL bis(( gamma )-triethoxysilylpropyl) tetrasulfide, 1-10 mL polyethylene glycol 200 and 1-20 mL potassium sulfide aqueous solution with a concentration of 100 g/L, adjusting the pH of the solution to 2-6 with acetic acid, stirring the solution in a magnetic stirrer at 20-50 degrees C for 1-5 hours, adding 1-80 mg reduced graphene, ultrasonically dispersing for 20-120 minutes to prepare a mixed solution, immersing the treated aluminum alloy in the mixed solution for 30-120 minutes, taking out, ultrasonically cleaning in deionized water to remove unreacted small molecules and solvents on the surface of the aluminum alloy, and solidifying in a vacuum oven at 80-120 degrees C for 1-3 hours.