Electroplating encyclopedia

Sometimes the brightness of the passivation film of the color zinc workpiece is poor, it is not that the trivalent chromium color zinc passivation solution is used improperly

2022-05-18

    In the production process of galvanizing, the color zinc workpiece needs to have good decorative properties, that is, it needs to have good brightness and bright color appearance.And sometimes the brightness of the color zinc workpieces produced is relatively poor. Is this because the trivalent chromium color zinc passivation solution is used improperly?

    Bigolly Technology made an analysis based on the field experience and the characteristics of the product's trivalent chromium color zinc passivation solution BZ-208,In fact, this is not the improper use of trivalent chromium color zinc passivation solution, mainly for these two reasons:


    1. The galvanized layer of the workpiece is relatively rough and the brightness is poor.The galvanized layer of the workpiece itself is relatively rough, and the brightness is relatively poor, so when the passivation treatment is performed, the brightness of the color zinc passivation film will be relatively poor.Therefore, in the production process, the quality of the galvanized layer of the workpiece should be checked to ensure that the galvanized layer of the workpiece has a good brightness, so that the color zinc passivation film after passivation will be brighter.

    2. The bright dipping of the workpiece is bad or the bright dipping time is short.After being used for many times, the bright dipping liquid is likely to become turbid due to a large number of impurities, which will affect the bright dipping effect of the workpiece, especially the cyanide-free alkaline galvanizing process is sensitive to impurities.However, the bright dipping time of the workpiece is short, and the galvanized layer does not get a good polishing effect, so the brightness after passivation is poor.During the production process, the bright dipping liquid should be replaced regularly, the control of the bright dipping effect of the workpiece should be strengthened, and the passivation time of the workpiece should be appropriately extended to ensure good bright dipping of the workpiece.

    Therefore, the poor brightness of the passivation film of the color zinc workpiece is not caused by the improper use of the trivalent chromium color zinc passivation solution, but the poor effect of the workpiece during the galvanizing process or bright dipping.Paying more attention to two details during production can ensure that the color zinc passivation film of the workpiece has good brightness.If you are interested in trivalent chromium color zinc passivation solution, please contact Bigolly customer service to get free samples and detailed technical information!

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