When designing the hanger, do the following:

1) According to the shape and size of the parts and the capacity of the plating tank, determine the overall dimensions of the hanger.

2) The bottom of the hanger should be kept at least 200mm away from the bottom of the tank. The bottom of the anode should be about 150mm shorter than the hanger. If the anode is longer, the bottom can be wrapped with plastic cloth.

3) The hanger should have a distance of about 100mm from the liquid surface. In order to avoid excessive concentration of power lines on the top of the part, the anode can be wrapped with a plastic cloth strip for 150mm from the liquid surface downward, or a plastic plate can be placed for shielding.

4) The distance between the parts and the anode should be: ≥200mm, because the farther the distance, the more uniform the coating.

5) For complex parts, auxiliary anode and protective cathode wire shields must be made.

6) Strictly calculate the plated area of the part,-determine the plating time according to the current density used, and meet the requirements as much as possible once.

7) The main hook and trunk of the hanger can pass the current that the whole hanger needs to pass. The shape and size of the main hook should be compatible with the shape and size of the pole bar. This is to remember that the current density that various materials can pass is different: Generally speaking, steel and stainless steel ≤1A/dm2, brass ≤2./dm2, pure copper ≤3A/dm2, aluminum alloy ≤1.6A/dm2 . .

When designing the hanger, the upper edge of each part in the upper row is 2~5cm away from the liquid surface, and in special circumstances it can be up to 10cm away from the liquid surface. The lower edge of some parts is 15-20cm lower than the groove, not less than 10cm. On automatic lines, the outside of the hanger should be 15-20cm away from the groove wall, not less than 10cm.

The distance between the parts on the hanger should consider the complexity of the parts and the type of plating solution. The more complex parts should be farther away, and the simpler parts can be closer. Aluminum oxide and tin-plated parts can be closer, bright copper and nickel-plated parts should be farther apart, and chrome-plated parts should also have a sufficient distance.

The size of the stem and the contact point of the hanger must consider the current passing through.

On the basis of considering the passing current, it is also necessary to consider whether there is sufficient mechanical strength, and to reduce the weight of the hanger as much as possible. In addition, too long and too big hangers are inconvenient to operate, and they are not welcomed by workers.

The length of the hanger and the anode should also be matched. In order to avoid the lower parts being too thick, the hanger should be longer than the anode, generally 5 to 15 cm long.

8) Precautions when using the hanger

When using the hanger, it is necessary to prevent the plating solution from being contaminated with each other, and the following three points should be paid special attention to.

(1) The hanger must be dedicated. The special purpose of the hanger is to prevent the solution retained in the insulating paint of the hanger from lifting up, blisters, welds, etc. from the A plating tank into the B plating tank, so that the solution of the B tank is contaminated.

(2) The hanger needs to be cleaned before use. The purpose of cleaning is to remove the dirt that will inevitably adhere to the hanger after it has been left in the air for a long time, otherwise it will not only pollute the plating solution, but also contaminate the plating parts, and affect the bonding strength of the coating.

(3) Some coatings must be removed before the hanger is used. Some coatings will dissolve in the pre-treatment process, such as zinc coatings, etc., so this coating must be removed before use, otherwise it will contaminate the pre-treatment solution.