- Sep 14, 2018 -
The choice of these two processes depends on the material of the workpiece being plated and the geometry of the workpiece. In addition to materials such as cast iron and carburized steel, the process used for workpieces made of other metal materials (mainly carbon steel) will depend on the geometry of the workpiece. The principle of selection is: high current of the workpiece during plating. The alkaline process is used for the difference between the density and the current density in the low current density region of the workpiece, and vice versa. For example, a workpiece with a blind hole or a workpiece with a far distance from the center of the workpiece (such as an impeller), the current density of the workpiece in the high current density region of the workpiece and the low current density region of the workpiece during electroplating The current density is very different. In this case, if an acidic process is employed, the difference between the thickness of the coating in the low current density region and the high current density region of the workpiece and the nickel content in the plating layer is much larger by the alkaline process. When the workpiece is simply shaped, such as cylinders of various types of cylinders, pistons, fasteners, etc., since the current density of the surface of the workpiece is relatively uniform, in this case, the acidic process should be selected because of the alkaline process. The second big point is not very meaningful, but its own shortcomings are quite prominent.