Design principles of electroplating hanger

The function of the electroplating hanger is to hang or fix various parts to connect them with the cathode. When anodizing and electropolishing, Connect with the anode, conduct current to the part, so as to achieve plating or other processing purposes. The hanger is of great significance for improving product quality, reducing manufacturing costs, reducing labor intensity and safe operation. The design of the hanger is related to the shape of the part, the requirements of the plating layer and the performance of the plating solution, and to a large extent depends on the actual experience of the designer.

1) The hanger should have sufficient mechanical strength and rigidity, can bear the weight of all parts, be strong and durable, and the hanger material should be stable and insoluble in the plating solution used.

2) The hanger should have sufficient conductive cross-section to ensure good electrical contact and avoid overheating to prevent the insulation coating from aging, blistering and falling off.

3) In order to obtain the uniformity of the coating thickness, the distance between the main surface of each part and the anode should be as equal as possible, and the parts should be located between the two anodes during double-sided electroplating. .

4) The position where the parts are mounted on the hanger should be the easiest place for the gas to discharge freely, so as to avoid the generation of air pockets and air scouring, and to prevent residual liquid from accumulating and increasing carry-out loss and causing pollution .

5) The hanger is in reliable contact with the parts, and will not collide, float or fall off under the condition of mechanical movement or air agitation.

6) The hook mark or conductive contact area on the part should be as small as possible, and should generally be arranged on a non-primary surface.

7) Prevent the parts from shielding each other, resulting in insufficient plating thickness or even failure to plate.

8) When necessary, auxiliary anodes, auxiliary cathodes or non-conductive shields should be used to obtain high-quality coatings.

9) Under the premise of ensuring the applicability, the hanger should be as light, simple, and universal as possible, easy to operate on the loading and unloading parts, and high production efficiency.

10) For the structure of the hanger, it should be determined according to the shape, size and complexity of the parts. According to the actual situation on the site, different hanger structures should be selected. Generally, the hanger components should be universal and standardized to facilitate repair, replacement and Utilization; The structure of the hanger is connected by welding, and the conductive copper hook is bent into a right-angle shape. The hanger and the parts should be in good contact, and threaded contact is used when necessary.

11) Practice has proved that the electroplating hanger for inner hole parts can be used without a metal protective cathode, and an insulating block (material is a hard plastic plate or organic glass) instead of the protective cathode. The cathode and anode of the inner hole plating hanger must be insulated.

12) The non-working parts of the hanger should be insulated with insulating materials to reduce current consumption.