The vacuum coating machine effectively avoids the phenomenon of bipolar electrodes

The vacuum coating machine effectively avoids the phenomenon of bipolar electrodes

If the amphoteric electrode phenomenon cannot be effectively avoided, serious electrochemical passivation will occur locally on the workpiece as the anode part, and special attention should be paid when plating multi-county nickel. Chromium is easier to passivate than nickel, so chrome plating on chromium must have good activation.

There are also many cases of chrome plating on chrome, such as: decorative chrome plating is used for secondary chrome plating when the primary deep plating ability is poor; in order to take into account both corrosion resistance and wear resistance, hard chrome plating is applied on milky chrome (basically no cracks); Molybdenum and molybdenum alloy electroplating requires chrome plating and so on.

The vacuum coating machine is typically after plating sulfate bright acid copper

Typically, after plating sulfate bright acid copper, an organic film passivation layer is often formed, which should be removed. Don't believe in the propaganda of acid copper brighteners claiming that there is no need to remove the film after plating, and do not consider the film removal process in the process design.

Because even if the new solution can not be removed, with the accumulation of organic impurities in the bright copper solution or the imbalance of the added brightener, a hydrophobic organic film layer will also be produced. As we all know, polyethylene glycol is an indispensable component in almost all acid copper brighteners, and the greater the amount of polyethylene glycol in the coating, the easier it is to form a hydrophobic film.

Passivation of the bottom coating on a vacuum coater. The more easily passivated the coating, the worse the bonding force of the coating on it. Nickel is a metal that is easy to passivate. During the nickel plating process, the power-off pair is slightly longer, and the nickel plating layer will undergo chemical passivation in the nickel plating solution;

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