When alkaline zinc nickel alloy additive is used, is the low current efficiency of the bath due to the low concentration of sodium hydroxide?

When alkaline zinc nickel alloy additive is used, is the low current efficiency of the bath due to the low concentration of sodium hydroxide?

Tue Nov 01 10:54:08 CST 2022

    In the process of using alkaline zinc nickel alloy additives, the current efficiency of the bath itself is relatively low, only about 70%, and sometimes the current efficiency of the bath is lower. Is this caused by the low concentration of sodium hydroxide in the bath?

    According to the field experience and the characteristics of the alkaline zinc nickel alloy additive BZ-617 of the product, Bigolly Technology has analyzed that the low concentration of sodium hydroxide in the plating solution will reduce the current efficiency.Because sodium hydroxide is a conductive salt, it can improve the conductivity and current efficiency of the plating solution. When the concentration of sodium hydroxide is low, the current efficiency of the bath decreases, and the bright area of the coating will become dark.However, in addition to the influence of sodium hydroxide on the current efficiency of the plating solution, attention should be paid to the following two points:

    1. The concentration of zinc ion and nickel ion in the plating solution is low.Zinc ion and nickel ion are the main salts of the bath. When their concentration is low, the current efficiency is low and the deposition rate of the coating is slow.During the production process, the concentration of each component of the plating solution shall be analyzed in time, and the concentration of zinc ion and nickel ion shall be controlled within the process range.

    2. The content of sodium carbonate in the bath is too high.When the concentration of sodium carbonate in the bath is too high, the internal resistance of the bath increases, the temperature rises faster, the current efficiency of the bath decreases, and the edges and corners of the workpiece are easy to be scorched.Bigolly suggested that the customer should control the content of sodium carbonate in the plating solution to be within 50g/L during production. If necessary, the sodium carbonate in the plating solution can be treated by freezing.

    Therefore, when we use alkaline zinc nickel alloy additives, the current efficiency of the bath becomes worse. In addition to the influence of sodium hydroxide, we should pay attention to the content of zinc ion, nickel ion and sodium carbonate in the bath.The current efficiency of the plating solution becomes worse, and the deposition rate of the coating is relatively slow, so the electroplating time will increase, thus increasing the production cost.If you are interested in alkaline zinc nickel alloy additives, please contact Bigolly customer service for free samples and detailed technical information!

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