Electroplating encyclopedia

When using acid zinc plating brightener, the role of each component in the bath is like this!

2022-04-20

    Do you know the function and concentration control parameters of each component in the plating solution when using acid zinc plating brightener?

    Bigolly Technology made an analysis based on the field experience and the characteristics of the product's acid zinc plating brightener BZ-528,the effect of each component in the bath and the control parameters of the concentration are as follows:

    1. Zinc chloride is the main salt of the acid zinc plating solution, which provides the zinc ions required for the zinc coating. The concentration of zinc chloride has a significant impact on the quality of the zinc coating.Increasing zinc chloride can speed up the deposition rate of zinc ions and shorten the plating time.When the concentration of zinc chloride is too high, the crystallization of the galvanized layer will be coarse; if the content is too low, the plating time will be longer, and the coating at the corners of the parts will be easily scorched.The concentration of zinc chloride is generally controlled at 40-80g/L.


    2. Potassium chloride is a conductive salt of acid zinc plating solution, which can improve the effect of cathodic polarization, improve the dispersing ability of the plating solution, and is conducive to the normal dissolution of the anode zinc plate.If the concentration of potassium chloride is too high, it is easy to precipitate crystals when the temperature is low, and the cloud point of the plating solution will decrease when the temperature is high in summer.When the potassium chloride concentration is too low, it will affect the conductivity of the plating solution, resulting in a small current, prolonging the electroplating time, and forcing a high current to make the galvanized layer rough;If the potassium chloride concentration is too low, the zinc ions in the plating solution will be out of balance, and the maintenance workload of the plating solution will be increased;Too low concentration of potassium chloride will also passivate the anode when it dissolves, resulting in black film and anode sludge.The concentration of potassium chloride is recommended to be controlled at 180-220g/L.

    3. Boric acid is a pH buffer, which can improve the brightness of the zinc coating.When the concentration of boric acid is too high, it is easy to precipitate crystals; when the concentration is too low, the upper limit of the cathode current density is lower.Generally, boric acid should be controlled at 25-35g/L.

    4. The acid zinc plating brightener can improve the cathodic polarization, refine the crystallization of the coating, and provide brightness and leveling effects.The quality of the plating solution and coating depends on the comprehensive technical ability of the acid zinc plating brightener.For example, Bigolly's acid zinc plating brightener BZ-528 also has the characteristics of wide temperature, low consumption, stability, simple operation and wide application range.

    Therefore, this is the control parameter for the function and concentration of each component in the plating solution when we use the acid zinc plating brightener to produce.If you are interested in acid zinc plating brightener , please contact Bigolly customer service to get free samples and detailed technical information!

    If you want to know more about zinc plating, you can check "Electroplating encyclopedia".