The insulation treatment of the electroplating hanger means that except for the parts that need to be in contact with the parts that require conductivity, other parts are wrapped or coated with non-metallic materials to make them non-conductors. In this way, the current in the electroplating process can be concentrated on the parts, which speeds up the deposition speed, and at the same time saves metal materials and power consumption. During the deplating and pickling of the hanger, the corrosion of the hanger can be reduced and the service life of the hanger can be prolonged.

Guangdong Stainless Steel CastingFor the materials used in insulation treatment, it is required to have chemical stability, heat resistance, water resistance, insulation, mechanical strength and bonding force, strong bonding force, high mechanical strength, and removable coating.

Pre-treatment should be carried out before insulation, that is, remove the burrs and welding scale on the hanger, and level the concave and convex parts. Apply compressive stress to poles, hooks, etc. to extend the life of the hanger.

Bandaging

Generally, a PVC plastic film tape with a width of 10-20mm and a thickness of 0.3-1mm is used.Coffee machine castingsThe parts of the hanger that need to be insulated are bandaged from the bottom up. Tighten the insulating tape and slowly turn the hanger when wrapping, press the seam of the first layer when wrapping the second layer, and finally tie it with a metal wire. The hook can also be covered with a PVC plastic pipe sleeve of appropriate size, leaving only the parts that need to be in contact with the parts.

The insulation method of wrapping with polyvinyl chloride film is commonly used in electroplating production, but there is always some gap between the plastic film and the hanger during the wrapping process, and the plastic is easy to expand and contract with heat, and the solution is easy to remain inside. , And make the solution contaminate each other between the processes, so it is subject to certain restrictions in use.

Dip coating

Robot stainless steel accessoriesThe hanger shall be degreasing, etched and dried before dipping, and then dipped or painted a layer of anti-corrosion insulating paint on its surface. After the paint film is completely dry, use a knife to scrape off the paint film on the part of the hook that needs to be in contact with the part. Commonly used insulating materials include perchloroethylene, polyvinyl chloride, polystyrene, polyethylene anticorrosive varnish, acid-resistant nitrocellulose paint and neoprene.

Perchloroethylene anticorrosive varnish method: remove oil stains and oxides on the surface to improve the bonding force between the paint layer and the hanger. Then immerse the clean and dry racks in perchlorovinyl anticorrosive varnish (G52-2), attach a layer of varnish to the parts of the racks that need to be insulated, and then dry them in the air for 10-20 minutes, when the first layer of paint film is dry After that, the dipping is repeated, and the number of coatings is related to the electroplating process, generally 5 to 10 times. When the paint film is completely dry, use a knife to remove the paint layer on the part of the hook that needs to be in contact with the part. This insulation treatment method is relatively simple. The perchloroethylene anticorrosive varnish has good chemical stability and can withstand acids and alkalis, but its heat resistance is not ideal, and it is generally only suitable for conditions below 80°C.

Polystyrene performance and temperature conditions are similar to those of perchloroethylene, but it has poor alkali resistance and unsatisfactory binding force.

The polyvinyl chloride coating has good acid resistance, alkali resistance, heat resistance, and abrasion resistance. It is suitable for occasions where the temperature is high or is prone to collisions.

Neoprene rubber has all the advantages of polyvinyl chloride coating of acid resistance, alkali resistance, and high temperature resistance, and it does not fall off and has a strong bonding force. It can be dried naturally after application, or it can be heated and dried.