Electroplating is divided into rack plating, barrel plating, continuous plating and brush plating, which are mainly related to the size and batch of parts to be plated. Applicable objects of rack plating, barrel plating, continuous plating and brush plating: Rack plating is a process where the workpiece is clamped on the hanger, suitable for large parts, the number of products that can be plated in each batch is small, and the plating thickness is more than 10μm. Such as car bumpers, bicycle handlebars, etc. The rack plating production line can be divided into manual line and automatic line. Barrel plating is usually applied to small parts. Barrel plating is called drum electroplating in the strict sense. It puts a certain number of small parts in a special drum, and indirectly conducts electricity in the rolling state to deposit various metal or alloy coatings on the surface of the parts to achieve surface protection and decoration. And a plating processing method for various functional purposes. According to the different rollers used, the common barrel plating methods in electroplating production are divided into three categories: horizontal barrel plating, tilted barrel plating and vibration barrel plating. Continuous plating is suitable for mass-produced wires and strips. Brush plating is suitable for partial plating or repair.