▎ 摘　　要

NOVELTY - Chemical composite nickel-phosphorus-graphene plating solution comprises 25-35 g nickel sulfate, 26-36 g sodium hypophosphite, 15-25 g citric acid, 5-15 ml lactic acid, 10-15 g sodium acetate, 60-120 mg first stabilizer, 5-10 mg second stabilizer, 20-80 mg sodium dodecyl benzene sulfonate, 40-140 mg graphene, 200-250 ml distilled water and ammonia water (remaining amount). USE - The plating solution is useful for forming a nickel-phosphorus-graphene composite plating layer by chemical plating on the surface of aluminum alloy parts (when the plating temperature is 84-88 degrees C, and 88 degrees C) (claimed). ADVANTAGE - The plating solution: adopts graphene, which is uniformly dispersed in the composite plating solution, and in the field of aluminum alloy plating; has high processing efficiency, fine crystallization of the coating, and good appearance and adhesion of the coating; adopts the composite coating, which has high hardness and good salt spray resistance; preparation method: is simple to process, easy to maintain, ensures stable composite plating solution, moderate complexing ability of the complexing agent; and utilizes in sewage treatment to break the network well, which can reduce production costs and wastewater treatment costs. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the plating solution, comprising (i) dissolving the nickel salt in the distilled water, then adding sodium hypophosphite and stirring until it is completely dissolved, then adding sodium acetate and stirring until it is completely dissolved, obtaining solution A; (ii) dissolving the citric acid in the distilled water, then adding lactic acid to completely dissolve, and then adding the first stabilizer and a second stabilizer, obtaining B solution; (iii) adding solution B into A solution, stirring uniformly to obtain solution C; (iv) adding graphene into distilled water, stirring, then subjecting surfactant sodium dodecyl benzene sulfonate to ultrasonic vibration to obtain the solution D; (v) adding the solution D into C solution, stirring uniformly to obtain the solution E; and (vi) adjusting the solution E pH to 4.4-5.