PCB plating is a process of plating a thin layer of other metals or alloys on certain metal surfaces by electrolysis. It is a process of attaching a metal film to the surface of metal or other materials by electrolysis to prevent metal oxidation. (such as rust), improve wear resistance, electrical conductivity, light reflectivity, corrosion resistance (copper sulfate, etc.) and enhance the appearance of beauty.

When the PCB is plated, the plated metal or other insoluble material is used as the anode, and the workpiece to be plated is used as the cathode, and the cation of the plated metal is reduced on the surface of the workpiece to be plated to form a plating layer. In order to eliminate the interference of other cations and make the plating layer uniform and firm, it is necessary to use a solution containing a plating metal cation as a plating solution to keep the concentration of the metal cation of the plating layer unchanged. The purpose of PCB plating is to plate a metal coating on the substrate to change the surface properties or dimensions of the substrate. PCB plating can enhance the corrosion resistance of metals (the corrosion-resistant metal is mostly used for plating metals), increase hardness, prevent wear, improve electrical conductivity, smoothness, heat resistance and surface appearance.

A technique of depositing a good metal coating with different properties and matrix material on a mechanical article by means of an electrolytic cell principle. The electroplated layer is more uniform than the hot dip layer and is generally thin, ranging from a few microns to tens of microns. Through electroplating, it is possible to obtain decorative protective and various functional surface layers on mechanical products, as well as to repair worn and machined workpieces.