▎ 摘　　要

NOVELTY - Graphene oxide nickel phosphorus composite plating liquid comprises (per L) 0.5-1 g nickel sulfate, 25-40 g sodium hypophosphite, 15-20 g sodium acetate, 15 g citric acid, 8-10 g lactic acid, 4 ml composite stabilizer, 41 mg steam and balance distilled water. The composite stabilizer comprises thiourea, potassium iodate and potassium iodide at 1:20:20 mass ratio. USE - Graphene oxide nickel phosphorus composite plating liquid used for providing preprocessed steel alloy surface with graphene oxide nickel phosphorus composite plating layer (claimed). ADVANTAGE - The graphene oxide nickel phosphorus composite plating liquid provides graphene oxide nickel phosphorus composite plating layer with thickness uniformity and clean and smooth surface. It has simple preparation and is suitable for continuous production. DETAILED DESCRIPTION - Graphene oxide nickel phosphorus composite plating liquid comprises (per L) 0.5-1 g nickel sulfate, 25-40 g sodium hypophosphite, 15-20 g sodium acetate, 15 g citric acid, 8-10 g lactic acid, 4 ml composite stabilizer, 41 mg steam and balance distilled water. The composite stabilizer comprises thiourea, potassium iodate and potassium iodide at 1:20:20 mass ratio. Reduction treatment of graphene oxide comprises adding graphene oxide in cleaning liquid for cleaning, where cleaning liquid comprises 10-40 mass% sodium hydroxide water solution or 10-40 mass% potassium hydroxide water solution, ultrasonically dispersing at 40 degrees C for 5-30 minutes, obtaining filter cake, washing the filter cake with deionized water for greater than or equal to 3 times, sensitizing at room temperature using sensitizing liquid i.e. aqueous solution containing 10-30 ml/L hydrochloric acid (HCl) and 10-40 g/L tin chloride (SnCl2), ultrasonically dispersing for 15-30 minutes, obtaining filter cake, washing with deionized water for greater than or equal to 3 times, obtaining sensitized graphene oxide, activating at room temperature using activating liquid i.e. water solution containing 10-30 ml/L HCl and 0.1-0.5 g/L palladium chloride (PdCl2), ultrasonically dispersing for 10-60 minutes, obtaining filter cake, washing with deionized water for greater than or equal to 3 times, obtaining activated graphene oxide, conducting reduction at room temperature by adding activated graphene oxide in 20-50 g/L water solution reducing agent, ultrasonically processing for 20-40 minutes, obtaining filter cake, washing with deionized water until neutral and vacuum drying at 20-60 degrees C, where reducing agent is sodium phosphate, sodium borohydride, and/or diethylamine borane. INDEPENDENT CLAIMS are included for: (1) preparation of graphene oxide nickel phosphorus composite plating liquid comprising subjecting graphene oxide to reduction treatment, mixing nickel sulfate, sodium hypophosphite, sodium acetate, citric acid, lactic acid, composite stabilizer, and distilled water, dissolving, adding 10 mass% sodium hydroxide aqueous solution to regulate the pH at 4-6, controlling the temperature at 50-70 degrees C, adding graphene oxide, which is subjected to reduction treatment and ultrasonically dispersing for 10 minutes to obtain graphene oxide nickel phosphorus composite plating liquid; and (2) application of graphene oxide nickel phosphorus composite plating liquid for providing preprocessed steel alloy surface with graphene oxide nickel phosphorus composite plating layer comprising subjecting pre-plated steel alloy workpiece surface to number 320 and number 280 sand paper polishing, heating at 80-100 degrees C, washing with 20 mass% sodium hydroxide solution for 15-20 minutes, washing with distilled water for 1 minute, washing with 10 mass% hydrochloric acid aqueous solution for 30 seconds, washing with distilled water for 1 minute, activating with 5 mass% hydrochloric acid aqueous solution for 30 seconds, washing with distilled water for 1 minute, placing the preprocessed steel alloy workpiece in graphene oxide nickel phosphorus composite plating liquid, stirring at 50-70 degrees C, heat preserving for 30-90 minutes, taking out, washing with deionized water and ethyl alcohol (1:3 volume ratio) mixed liquid until washing effluent is neutral and drying at 105 degrees C to provide the steel alloy surface with graphene oxide nickel phosphorus composite plating layer.