In the production process of using bright nickel plating additives, due to the weak acidity of the plating solution, it is easy to mix nitrate ions and cause malfunctions. So how can we quickly remove nitrate from the plating solution?
Due to the fact that nitrate is an oxidant, it can disrupt the composition of the brightener and reduce the brightness current density range. A small amount of nitrate can reduce the dispersion and deep plating ability of the plating solution, making the nickel coating thinner at low current density, or even missing the plating, and the coating may turn slightly blue. At this time, measures such as adding additives are not improved.
Taking Bigley's bright nickel plating additives Ni-301 as an example, the plating solution can be used for Hull cell plating test: current density is 0.2A, time is 10 minutes, static electroplating, temperature is 55 ℃, and the pH value of the plating solution is about 4.0. When there are nitrate ions in the plating solution, there will be black stripes in the middle and high areas of the test piece, yellowing in the middle and low areas, and there will be plating leakage in the low areas. At this point, the plating solution can be treated as follows:
The nitrate content in the general plating solution is not very high, and sodium bisulfite can be used for treatment. First, use the Hull cell experiment to determine the amount of sodium bisulfite. When adding the plating solution, dissolve the sodium bisulfite into a 5-10% aqueous solution, and add it to the plating solution with strong stirring. After adding it, stir the plating solution for 30 minutes to allow nitrate to decompose. Diluted hydrogen peroxide solution is then added to the plating solution under strong stirring to remove residual sodium bisulfite. After that, adjust the process parameters, and then conduct Hull cell flaking test. When the flaking is normal, adjust the plating bath, so that normal production can be carried out.
So, in the production process of using bright nickel plating additives, we can use this method to treat nitrate in the plating solution, which is simpler and faster than the electrolytic method to treat the plating solution. If you are interested in bright nickel plating additives, please contact Bigley customer service to obtain free samples and detailed technical information!
If you want to learn more about nickel plating, you can click to view the "Electroplating Encyclopedia".