Study On Electroless Nickel Plating Process And Waste Liquid Treatment With Carbon Fiber Mesh Catalytic Method

Carbon fiber composite materials are increasingly widely used, is gradually eroding the status of traditional metal materials. Carbon fiber reinforced metal matrix composites have excellent properties. However, the bond between carbon fiber and metal matrix is poor. Interfacial bonding problems often affect the properties of composites. A transition metal is usually deposited on the surface of carbon fiber to solve the bonding problem. In this paper, electroless nickel plating on carbon fiber was studied. The electroless plating was used to modify the surface of carbon fiber. In this paper, mesh wire catalytic method was used to induce the carbon fiber from plating. The pretreatment process of electroless plating, the bath ratio and the plating process were optimized.The results show that the best way to remove the adhesive is to burn at 400℃ for 20min. The best dispersing method is the worst when the dispersing method is dispersed and there are still sticking together after CMC dispersion. Carbon fiber, carbon fiber dispersed completely after ultrasonic dispersion; coarsening time is best in 15min. The orthogonal experiment was used to optimize the ratio of plating solution and the single factor method was used to study the catalytic time, temperature and pH value. The experimental results were analyzed by weight gain rate, coating morphology and plating time. The optimum formulation and processing conditions were as follows:nickel sulfate 35g/L, sodium hypophosphite 25g/L, sodium citrate 15g/L, ammonium sulfate 35g/L, thiourea 2mg/L, reaction temperature 60℃, PH value of 9, the catalytic time 20min. The binding strength of the nickel-plated carbon fiber prepared by the iron net catalytic method was tested by the hot and cold cycle method. The composition of the coating prepared by the palladium activation method and the mesh wire catalytic method were compared by EDS.The harm and treatment method of electroless nickel plating waste liquid are introduced, and the waste solution is treated by precipitation method. The process conditions of removal of nickel and phosphorus were studied by a large number of experiments. The ion concentration was determined by titration and spectrophotometry, and the technological conditions of waste liquid treatment were optimized. Finally, the nickel and phosphorus in the effluent after the optimization of the process conditions meet the national emission standards.