▎ 摘　　要

NOVELTY - Magnesium alloy chemical conversion composite film comprises molybdate layer, rare earth layer and graphene layer. The molybdate layer is composed of magnesium oxide and magnesium molybdate, and is connected with substrate, and is the bottom layer of the chemical conversion composite membrane. The rare earth layer is composed of magnesium oxide, magnesium molybdate, lanthanum oxide and neodymium(III) oxide, and is an intermediate layer of the chemical conversion composite film. The graphene layer is composed of gamma-aminopropyltriethoxysilane KH-550 and graphene oxide, which is the outer layer of a chemical-transformation composite film. USE - The magnesium alloy chemical conversion composite film is useful for preparing magnesium alloy component surface protective layer, and in aerospace, automobile, electronics and military industries. ADVANTAGE - The magnesium alloy chemical conversion composite film meets the green environment requirement, and has excellent combination with the substrate, and strong anti-corrosion ability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for method for preparing magnesium alloy chemical conversion composite film. The method utilizes sodium hydroxide, sodium carbonate, water, magnesium alloy, alkaline solution, molybdate conversion solution, sodium dodecylbenzenesulfonate aqueous solution, rare earth conversion liquid, aqueous lanthanum(III) nitrate solution, aqueous lanthanum(III) nitrate solution, aqueous neodymium nitrate solution, molybdate conversion solution stock solution, ethanol, graphene oxide-ethanol aqueous solution, the water is distilled water or deionized water, the molybdate conversion solution is composed of sodium dodecylbenzensulfonate, sodium molybdate , citric acid monohydrate and water, the rare earth conversion liquid is composed of sodium dodecylbenzensulfonate, sodium molybdate, citric acid monohydrate, lanthanum(III) nitrate, neodymium nitrate and water.