Pre-treatment of aluminum plating on the preparation of work, you can enter the aluminum plating process.

Whichever type of pretreatment is used, the first step in the electroplating after finishing the pre-treatment is flash copper plating.

(1) flashing copper

It is now suitable for flash plating copper plating solution is mainly cyanide copper plating process. After the completion of flash copper plating, to be fully cleaned and activated treatment, activation with 1% to 3% sulfuric acid solution, if the subsequent plating is acidic copper or nickel, after activation without washing can be directly into the slot plating. If it is plated other alkaline plating solution, especially cyanide bath, the activation must be carried out after two times to wash into the tank plating.

(2) intermediate plating

After the flash copper plating, according to the product design or process requirements of the middle plating plating, in fact, the middle coating can also be said that the bottom plating, flash copper is only to ensure the dispersion and binding force to take a technical coating , To achieve the product on the coating requirements, according to the surface of the final coating to use the middle coating.

Such as copper plating, nickel plating or other plating or processes that can be used as intermediate or bottom plating. If the surface coating is silver, it is necessary to flash copper and then the appropriate thickening of the coating, such as the use of acid bright copper, etc., and must be smelted silver (or silver plating) before entering the surface of the final coating Plating. In this chapter, the general process, copper, nickel and other processes can be used as aluminum plating on the middle plating.

(3) surface coating

The surface coating is also the target coating required for electroplating on aluminum, either as a decorative coating or as a functional coating. For electroplating, the majority of aluminum plating is a functional coating, a small number of exterior parts both functional and decorative role. Pure decorative coating is limited to the handle on the frame, knobs, signs and so on.