The Growth Mechanism And Simulation Research Of Ni-Co-SiC Nano-composite Coatings

With the development of machinery,chemical industry,petroleum and other industries,the use conditions of equipment in related industries are gradually improving.It is necessary to study the technology of surface strengthening and protection of mechanical products in manufacturing industry,the reliability and service life of mechanical parts,and the quality and performance of mechanical manufacturing equipment.However,it is an effective way to protect metal materials with various composite coatings.Therefore,it is of great significance to study the growth mechanism,process parameters,properties,simulation and other aspects of Ni-Co-SiC nano composite coating in this paper.Because the different growth mode of nano-composite coating can cause the difference of the combination between the coating and the substrate and the coating performance,the study of the growth mode of the coating has a very important guiding role in controlling the plating process and obtaining excellent coating.In order to study the formation mechanism of the morphology of the coating and control the parameters of the morphology better,it is imperative to study the nucleation and growth mechanism of the nano-composite coating.In this paper,the deposition model and mechanism of Ni-Co-SiC nano-composite coating were studied firstly,including strong adsorption and weak adsorption,and the two-step adsorption mechanism of Guglielmi model was conformed.Then,the microhardness and wear amount of Ni-Co-SiC nano-composite coating prepared under three process parameters of different cathode current density,different temperature and different electrode spacing were synthetically analyzed.Under the same test conditions,the cathode current density is more suitable for the parameter range of 1.5 to 2.5 A/dm~2,and the performance is the best when the current density is 2 A/dm~2.When the temperature is 50℃,the hardness and wear resistance are the best,and the suitable temperature range is 45℃to 55℃.The results show that when the electrode spacing is between 30 mm and 50 mm,and the parameter is 40 mm,the coating performance is the best.Through the observation of surface morphology,XRD analysis,wear resistance test to analyze the quality of the coating,further proved that under the same test conditions,the best performance of the coating is in the current density of 2 A/dm~2,temperature of 50℃,electrode spacing of 40 mm,which shows that the appropriate process parameters will affect the performance of the coating.COMSOL Multiphysics finite element analysis software uses finite element analysis principles to perform numerical simulation and computational analysis on many scientific and engineering problems.In this paper,the actual value of the thickness of the Ni-Co-SiC nano-composite coating is obtained through experiments.The simulation value of the Ni-Co-SiC nano-composite coating is obtained through the simulation software.The simulated coating thickness value of the nano-coating with different process parameters and the actual coating obtained by the experiment are obtained.Comparing the thickness values,the results show that the minimum value of the relative error of the thickness value is only1.66%,and the results show that the coatings appear to be thin on both sides in the middle in both experiments and simulations.By analyzing the current density and the distribution of electrolyte potential during the electrodeposition process,the reliability of COMSOL Multiphysics software for coating thickness simulation is verified,which will lay a foundation for future improvement and further research of nano-coatings.