We will find the presence of sodium carbonate in the bath after using the alkaline zinc-nickel alloy additive for a period of time.So where do these sodium carbonates come from?
Bigolly Technology made an analysis based on the field experience and the characteristics of the product's alkaline zinc-nickel alloy additive BZ-617,the zinc-nickel alloy plating solution contains a large amount of sodium hydroxide. During the production process, it will continuously absorb carbon dioxide in the air to form sodium carbonate.In addition, sodium hydroxide and nickel additives both contain sodium carbonate, but with the progress of production, sodium carbonate will continue to accumulate in the plating solution.
When the concentration of sodium carbonate in the plating solution is high, the internal resistance of the plating solution increases, the temperature rise is accelerated, and the upper limit of the current density decreases.If the current is slightly larger, the corners of the workpiece will be scorched.In this way, the plating efficiency of the plating solution will be reduced, the plating time will be increased, and the production cost of the customer will be increased.
So how should the sodium carbonate in the plating solution be treated?Here Bigolly recommends customers to use the freezing method:When the temperature of the plating solution is lowered, the sodium carbonate will crystallize and precipitate at a lower temperature. At this time, continuous filtration of the plating solution can significantly reduce the content of sodium carbonate in the plating solution.Although the calcium carbonate precipitation method can also be used to treat sodium carbonate, this method requires relatively powerful filtering equipment, otherwise the plating solution will be scrapped and the cost will be too high.
Therefore, when we use alkaline zinc-nickel alloy additives for production, we should control the content of sodium carbonate in the plating solution, which can reduce the occurrence of failures.If you are interested in zinc-nickel alloy additives,please contact Bigolly customer service to get free samples and detailed technical information!
If you want to know more about nickel plating, you can check "Electroplating encyclopedia".