▎ 摘　　要

NOVELTY - A coating composition comprises nickel-copper-cerium-lanthanum-phosphorus-graphene composite, where the nickel-copper-cerium-lanthanum-phosphorus-graphene composite comprises 35-65 mass% nickel, 10-30 mass% copper, 0.6-12 mass% cerium, 0.1-16 mass% lanthanum, 5-18 mass% phosphorus and 0.01-2 mass% graphene. USE - Coating composition for use in bio-oil of vehicle engine. ADVANTAGE - The coating composition is easy to realize industrial production and widely applied to metal protection, surface processing machinery, energy-saving and environmentally-friendly vehicle, and can be prepared simply, and has better anti-corrosion and wear resistance property, and provides coated product with high density. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for processing vehicle engine cylinder, which involves preprocessing engine cylinder by removing oil and rust with lye at 65-80 degrees C for not greater than 6 minutes, where the lye comprises 2-4 g/l sodium hydroxide, 6-8 g/l sodium bicarbonate, 1-1.2 g/l sodium phosphate dodecahydrate, 6-7.5 g/l sodium silicate, and 0.3-0.5 g/l OP-20, descaling the engine cylinder with acid solution at 65-80 degrees C, where the acid solution comprises 0.1-0.2 mol/l sulfuric acid and 0.2-0.4 mol/l hydrochloric acid in volume ratio of 1:1, washing the engine cylinder with deionized water, setting the engine cylinder in jar containing liquid for gradient chemical plating coating process, setting temperature of liquid, stirring speed and pH, washing the engine cylinder with deionized water, where the jar liquid comprises 5-10 g/l nickel sulfate, 5-10 g/l copper sulfate, 10-16 g/l cerium nitrate, 8-12 g/l lanthanum nitrate, 10-12 g/l sodium citrate dihydrate and 10-12 g/l lactic acid, adding continuous liquid phase solution into the cylinder for 30 minutes, where the continuous liquid phase solution comprises 1.2-2 mass% graphene and 50-60 g/l sodium hypophosphite monohydrate in volume ratio of 1:1, regulating pH of the engine cylinder with 40 mass% sodium hydroxide solution at 4.4-4.6, maintaining pH at 8.4-8.6 for 10 minutes, plating liquid temperature at 88-92 degrees C and stirring speed at 300-500 revolutions/minute, washing the coated engine cylinder with hot water, drying the engine cylinder with sodium citrate dihydrate and lactic acid, annealing the engine cylinder in muffle furnace at 400-450 degrees C at a heating speed of 2-8 degrees C/minute, and cooling the engine cylinder to room temperature to obtain the product.