In the process of using alkaline zinc-nickel alloy additives, the current efficiency of the plating solution itself is relatively low, only about 70%.And sometimes the current efficiency is lower, is this because of the low concentration of sodium hydroxide in the bath?
The low concentration of sodium hydroxide in the bath will reduce the current efficiency.Because sodium hydroxide is a conductive salt, it can improve the conductivity and current efficiency of the bath.When the concentration of sodium hydroxide is low, the current efficiency of the plating solution decreases and the plating layer becomes dark.
Bigolly Technology made an analysis based on field experience and the characteristics of the product alkaline zinc-nickel alloy additive BZ-617, but in addition to sodium hydroxide affecting the current efficiency of the plating solution, two points should also be noted:
1. The concentration of zinc ions and nickel ions in the bath is low.Zinc ions and nickel ions are the main salts of the bath. When their concentrations are low, the current efficiency is low and the deposition rate of the coating is slow.During production, the concentration of each component of the plating solution should be analyzed in time, and the concentration of zinc ions and nickel ions should 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 corners of the workpiece are prone to scorch.Bigolly recommends that customers should control the sodium carbonate content of the plating solution within 50g/L. When there is too much sodium carbonate, 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 plating solution becomes poor. In addition to the influence of sodium hydroxide, we should also pay attention to the content of zinc ions, nickel ions and sodium carbonate in the plating solution.The current efficiency of the plating solution becomes poor, and the deposition rate of the plating layer is relatively slow, so that the plating time will increase, thereby increasing the production cost.If you are interested in alkaline zinc-nickel alloy additives, please contact Bigolly customer service, you can get free samples and detailed technical information!
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