Advantages And Disadvantages Of Barrel Plating

- Jan 16, 2019-

Barrel plating is strictly called roller plating. It is to place a certain number of small parts in a special roller, and indirectly, to deposit various metal or alloy coatings on the surface of the parts in a rolling state to achieve surface protection, decoration or function. A method of electroplating for sexual purposes.

The typical barrel plating process is as follows: the small parts that have been pre-plated are loaded into the drum, and the parts are pressed against the cathode conductive device in the drum by their own gravity to ensure that the current required for the parts to be plated can be smoothly transmission. Then, the drum rotates in a certain direction at a certain speed, and the parts are continuously rolled and dropped after being rotated in the drum. At the same time, the metal ions are reduced to metal plating on the surface of the part by the action of the electric field, and the fresh solution outside the drum is continuously replenished into the drum through numerous holes in the drum wall, and the solution in the drum and the gas generated during the plating process are also Through these small holes, the outside of the cylinder is continuously discharged.

At present, the amount of processing of barrel plating accounts for about 50% of the entire electroplating process, and involves dozens of plating types such as galvanizing, copper, nickel, tin, chromium, gold, silver and alloy. Moreover, barrel plating has a wide range of applications, such as fasteners, stampings, plumbing, electronic components and other similar high-volume plating parts. Even in the electroplating industry, there was a saying that "as long as the plated parts can be rolled into the drum, it can be barrel-plated". This sentence is a bit exaggerated, but it can vividly illustrate the advantages of barrel plating in today's electroplating industry. Today, barrel plating has evolved into a plating method that is very common in applications and almost in parallel with the plating.

So what are the advantages of barrel plating and small parts hanging plating?

First, save labor and improve labor productivity

Barrel plating combines a large number of small parts for electroplating, eliminating the need for cumbersome loading, saving labor and improving labor productivity. This is the biggest advantage of barrel plating compared to small parts. For example, a factory ¢ 5mm × 5mm iron screws are plated with bright nickel, and one GD-10 type barrel plating machine is used. One worker operates, and the output per shift is about 70-80kg. The factory initially used copper wire bundling and plating method. One worker can produce up to 5 to 6 kg per shift. If the output per shift is 70 to 80 kg, about 8 to 12 workers are needed.

Second, the surface quality of the plated parts is good.

During barrel plating, the coarse crystals cannot be grown on the surface of the parts due to the mutual polishing between the parts and the parts. Therefore, the obtained coating is fine, soft, uniform in color and has a high surface finish. For example, plumbing hoops and elbows (Ma Steel) are galvanized. These parts are barrel-platable and can be plated, but the surface quality of the barrel-plated parts is much better than the plating.

Third, the thickness of the plating layer is small.

The thickness of the coating is volatility, reflecting the proximity of the thickness of the coating between the parts. The thickness fluctuation of the plating layer is small, indicating that the coating thickness between the parts is close to each other. During the barrel plating, the small parts are turned from the inner layer to the surface layer in the drum for a while, and then turned back to the inner layer from the surface layer. When the surface is turned to the surface layer, the parts are normally plated, and the electrochemical reaction is basically stopped when the inner layer is turned back. When electroplating is just underway, there are always many opportunities for parts to be turned over to the surface, and there are many opportunities for plating and thick plating. When there is less chance of turning parts to the surface, the plating opportunities are less and the plating is thin. However, as the plating time is extended, the probability of turning in and out of different parts is gradually equal, and the thickness of the plating between the parts is gradually close, and the fluctuation of the thickness of the plating layer is gradually reduced. Moreover, the various functions of the different parts in the drum are gradually equalized, and the surface quality between the parts is gradually becoming the same.