In the production process of using bright nickel plating additives, the correct adjustment of the pH value of the plating solution is very important. If the pH value of the plating solution is not adjusted properly, the coating quality of the workpiece will be affected.Two days ago, after adjusting the pH value of the plating solution in Mr. Chen's nickel plating tank in Shantou, the coating of the workpiece was relatively rough, and some pinholes appeared.
With the help of Mr. Chen, Bigolly engineer rushed to the scene immediately.After understanding the situation, the engineer found that the pH value of Mr. Chen's nickel plating solution was too low after adjusting the pH value with concentrated sulfuric acid, the pH was then increased with a concentrated sodium hydroxide solution, which turned out to be too high.Repeated several times, the pH value was not adjusted properly, and the balance of the nickel plating solution was also destroyed.
The addition of excess concentrated sulfuric acid to the nickel plating solution reduces the solubility of nickel sulfate, which will cause a lot of nickel sulfate crystals to precipitate in the plating solution.Afterwards, when the concentrated sodium hydroxide solution is used for callback, a colloidal nickel hydroxide precipitate will be formed due to the chemical reaction between sodium hydroxide and nickel salt. At this time, the composition concentration of the plating solution will decrease, and Mr. Chen starts production without analyzing and adjusting the plating solution, which will increase the resistance of the plating solution, and the plating layer plated on the workpiece will be rough and pinholes will appear.
The engineer assisted in filtering and electrolytic treatment of the plating solution, and after analyzing and adjusting the concentration of each component of the plating solution, the produced workpieces returned to normal.Mr. Chen lamented that this failure occurred because the sulfuric acid and sodium hydroxide used to adjust the pH of the plating solution were not diluted and then added, which caused the pH of the plating solution to fluctuate greatly and caused the loss of nickel salt, which was really not worth it !
Bigolly recommends that customers use nickel carbonate to increase the pH of the bath.A small amount of nickel hydroxide precipitates during operation, but it dissolves easily.When the pH value of the plating solution is not enough, it can continue to be added, and then continue to measure the pH value after vigorous stirring until the pH value of the plating solution is between 3.8 and 4.5.
Therefore, in the production process of using bright nickel plating additives, the improper adjustment of the pH value of the plating solution has a great impact on the plating solution.Use nickel carbonate whenever possible to increase the pH of the bath.In addition, the concentrations of nickel sulfate, nickel chloride and boric acid in the plating solution should be regularly analyzed and recorded, so as to maintain the stability of the plating solution and effectively reduce the occurrence of failures.