The Research Of B₄C Particulate Reinforced Iron-Based Composite Coating

Iron-based composite coating prepared by electro-deposition on a substrate. By orthogonal experiment to optimize the pH value,FeCl₂ concentration, current density plating process parameters on the morphology and mechanical properties, and obtained the main factor in the performance and best combination of technology; Meanwhile electrodeposited iron has a faster deposition rate which is conducted to the adsorption and deposition of hard particles, iron-based composite coating were prepared by adding B₄C.Through orthogonal experimental study the effect of Fe-B₄C complex deposition process mixing cycle, the particle concentration and particle size, current density on the coating surface morphology, structure, hardness, wear resistance and corrosion resistance. Determined the optimum combination of primary and secondary factors and the best technology.Based on Fe-B₄C composite coating, by adding CrO₃, forming Cr-Fe-B₄C composite coating to improve the corrosion resistance of the coating.The results showed that surface hardness was improved, pH0.5, FeCl₂ at a concentration of 400g/L, the current density of 15A/dm2 reach maximum hardness values, the maximum value is 661.2HV0.2; The added of boron carbide improve the wear resistance of the coating. When B₄C content is 50g/L, B₄C particle size of 40?m, current density of 20A/dm2, FeCl₂ at a concentration of 600g/L the wear resistance of the composite coating reach best; F-test results show that, B₄C content abrasion effect on composite coating significantly; The added of CrO₃ improve corrosion resistance of the composite coating greatly. With the deposition amount of the plating solution CrO₃ increase the corrosion rate of the deposited layer is reduced, increasing the corrosion resistance, the minimum corrosion rate 0.0218mg/h·dm-2.