When we use nickel plating brightener for production, sometimes the workpiece is very clean in the pretreatment, but the coating has pinholes after nickel plating.So what causes the pinhole phenomenon of the coating?
According to the field experience and the characteristics of the product nickel plating brightener Ni-301, Bigolly Technology has made an analysis, mainly including the following four points:
1. Hydrogen generated during nickel plating is retained on the workpiece surface.In the nickel plating process, the plating solution shall be stirred and surfactant shall be added. If the stirring force is not enough or the additive content is low, hydrogen cannot be separated in time, pinhole phenomenon will occur.
2. The pollution caused by the oil and unclean stirring air brought into the plating solution during the processing or polishing of the workpiece, as well as the decomposition of additives.These will increase the oil substances in the plating solution, float on the liquid surface, and easily adhere to the workpiece surface, leading to the phenomenon of pinholes in the coating, which will seriously cause poor adhesion of the coating.
3. The falling dust in the air and the rupture of the anode bag cause sludge to enter the bath, the sediment generated by excessive iron, calcium and other impurities in the bath, and the activated carbon particles that are not removed after the bath is heavily treated.These particles will impact on the surface of the coating due to air agitation during nickel plating, which will hinder the deposition of the coating and form a pinhole phenomenon.
4. During normal production, the pH value of the plating solution will keep rising, and the concentration of hydroxide will also keep increasing.When it is increased to a certain extent, nickel hydroxide precipitates will be produced. If these precipitates deposit with nickel, pinhole phenomenon will easily occur.
Therefore, we should strengthen the management of the plating solution, the inspection of equipment and the analysis and adjustment of the composition of the plating solution in the electroplating process using nickel plating brighteners, so as to avoid the occurrence of pinholes.If you are interested in nickel plating brightener, please contact the Bigolly customer service for free samples and detailed technical information!
If you want to know more about nickel plating, you can click to view the "Electroplating encyclopedia".