Study Of Ni-SiC Nano-Composite Plating Process

Composite plating is a direct and effective way to optimize the surface of common metal material with the characters of high hardness, high wearable and high erode-resistant. The emergence of nanometer material brings a new development to composite plating. Nanometer material is superior to common materials in its physical and chemical characters. A better coating can be got by substitute nanometer grain for micrometer grain in the composite plating bath. As the weight of nanometer grain is less than micrometer grain, so it is not only enhance the coating properties but also economize the material.In this paper author prepared a Ni-SiC nano-composite Plating coating on the copper substrate using composite Plating technology by adding nano-SiC in the watt bath. Studied and solved the key problem of making the nanometer grain stable and uniform in the composite plating process. A feasible technology route and the best plating process parameters were ascertained by orthogonal test. The properties of the coating were tested and put forward the conception that in order to obtain an excellent composite coating the nanometer grain should be dispersed uniformly. So the main researches and results were as follows:1. Choosing a proper disperse method, the machine whisk, pH adjust, ultrasonic and surfactant method were analyzed separately. The influence of different types of surfactant to the stability and uniformity of the nano-SiC disperse in the plating bath was chiefly studied. Mixing the anion and non-ion surfactant in the proportion of 2:1 can get the best effect, and the optimized dosage is 0.4%g/L.2. The parameters of pH, temperature, cathode electricity density and dosage of nano-SiC in the plating bath as well as their applying scopes were analyzed using single factor test. Then the best process parameters were determined using orthogonal test. The optimized process parameters are SiC 4g/L, current density: 3A/dm2, temperature:30℃, whisk speed:120r/min, pH:4.3. The thickness, hardness, porosity, corrode-resistant, combines intensity and wearability of the composite plating coating were tested. The result shows that the composite plating coating which was made by the best process parameters had an excellent integration speciality. The hardness, corrode-resistant andwearability of the composite plating coating were more than 3 times of pure nickel plating coating. The surface of the coating was observed by optics microscope and scan electron microscope and the result shows that the surface is flat and finer grain size can be observed. The composite plating coating contains SiC 10.89wt%.