A few days ago, a friend had such a problem in the process of using nickel sulfamate additives:The concentration of nickel sulfamate in the bath was 700 ml/L, and the pH of the bath was 4.3 at the beginning.After an hour, the pH value dropped to 3.7, and then stabilized at about 3.7. The pH value of the plating solution was adjusted with basic nickel carbonate but did not rise.What is the reason for this?
Bigolly Technology made an analysis based on field experience and the characteristics of nickel sulfamate additive Ni-1000, mainly including the following two points:
1. The concentration of boric acid in the plating solution is low.Boric acid is a buffer that can stabilize the pH of the bath within a certain range.When the concentration of boric acid in the plating solution is low, it loses the effect of buffering the pH value, and also affects the performance of the plating solution, which is easy to cause the workpiece to be scorched in the high current density area.Therefore, in the production process, we should control the concentration of boric acid in the plating solution within the process range.
2. Heating is required when using basic nickel carbonate to adjust the pH value of the plating solution.When using basic nickel carbonate to adjust the pH value of the plating solution, it is necessary to heat the plating solution to about 70 °C, but not higher than 80 °C, to avoid the decomposition of sulfamic acid in the plating solution, and slowly add nickel carbonate under stirring.Basic nickel carbonate is relatively slow to adjust the pH value. During the adjustment process, it should be ensured that the concentration of boric acid will not fluctuate greatly.During the production process, the pH value of the nickel sulfamate plating solution should be controlled within the range of 3.5 to 4.5.
The control of pH value in nickel sulfamate bath is very important, it will affect the conductivity and cathodic current efficiency of the bath, and also affect the mechanical properties of the coating.When we use nickel sulfamate additives to produce, when the pH value of the plating solution cannot be adjusted up, we can solve the problem from the above two points, which can effectively reduce the loss caused by failure.If you are interested in nickel sulfamate additives, please contact Bigolly customer service to get free samples and detailed technical information!
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