Influence of technology of high-speed galvanization on roughness and micromorphology of coating

Simulation gravity high-speed plating bath was used to study the technology of high-speed galvanization. The influence of three chief process parameters on the surface roughness was evaluated. These parameters include cathode current density, flow velocity of plating solution and thickness of galvanization coating. It is found that the surface roughness initially decreases and then increases with the increasing of current density (30-70 A/dm²); and decreases constantly as the flow velocity(0.8-2.0 m/s) of plating solution increases; however it increases monotonously along with the thickness of the galvanization coating(20-90 g/m²). On the basis of analysis of the data and figures, the relationship among the parameters was discussed, and the reason for influencing the roughness was illustrated. And the influence of three parameters on the micromorphology of coating was studied. It is found that the parameters have a great influence on the micromorphology of galvanization coating.