Below we will introduce some points to note in the design, selection and use of racks during anodizing.

1. Design of anodizing racks

The design, manufacture and selection of the fixtures used have a great impact on the quality of anodizing treatment. The design principles of the racks are: easy installation and disassembly, firm fastening of the work-pieces, good contact and no deformation.

1. It is best to use a copper plate as the hook for the contact part between the rack and the electrode rod.

2. The racks must have a certain strength and rigidity, and it should not swing in the tank due to the rapid flow of the anodizing solution.

3. Under the condition of ensuring the passage of current, the contact area between the rack and the work-pieces  should be small.

4. The cross-section of the racks should not be too small, because the small cross-sectional area will increase the resistance, which will easily cause the racks to heat up and reduce the strength, or even burn the fixture.

2. Selection of racks for anodizing process

The structural form of the fixture should be determined according to the shape, structure and size of the anodized parts, and it should be considered that when the parts clamped by the racks are placed in the groove, it should be ensured that the parts are in contact with the solution and that the solution can pass freely.

(1) For small round or flat parts, tongue-reed clamps and spring clamps can be used;

(2) For small and angular parts, basket-type racks can be used;

(3) For large parts (medium and small parts are also acceptable), thick pure aluminum wire can be inserted and fixed in unimportant holes on the parts, and then hung on the pole for processing, or the aluminum wire can be made into simple clamps of different forms according to the shape of the parts.

3. Use of anodizing process racks

In order to ensure smooth current flow, the contact parts of the parts should be chemically stripped or filed with a file each time the rack is used. The rack is preferably made in a detachable form. The clamp head of the rack can also be made of titanium metal, because titanium metal has good corrosion resistance. Although it is passivated during anodizing treatment in dilute sulfuric acid solution, it does not affect the passage of current and has a long service life. It will not lose its meaning due to high prices (compared with other materials, it is still cost-effective)

For the racks material, it is required to have good conductivity and certain corrosion resistance. If the surface of the rack is not coated with a protective layer, pure aluminum or the same material as the work-piece can be used. In order to save electricity and extend the service life, the rack should be coated with a covering layer for insulation except for the part in contact with the anodized parts.

Most electroplating products are processed by the rack plating process, and the name of the rack comes from this, but it is by no means just hanging it. The position, direction, quantity of the plated parts on the hanger, as well as the distance and relative position of the plated parts in front, back, left, right, and top and bottom, all have an important impact on the quality and production efficiency of electroplated products.

The above is the information provided by Signum. For more relevant information, please visit Titanium Anodizing Rack (signum.cc) .