In the production process of using nickel plating additives, sometimes the coating of the workpiece is prone to peeling or blistering, which will seriously affect the appearance and performance quality of the coating.So what causes the peeling and blistering of the nickel-plated layer?
Bigolly Technology made an analysis based on the field experience and the characteristics of the nickel plating additives Ni-301, mainly for the following three reasons:
1. The workpiece is poorly treated before plating.The workpiece is not thoroughly pre-treated or washed with water, and there are residual oxide scale and other debris on the surface when entering the nickel tank, which will cause peeling and blistering of the coating.Therefore, we should strengthen the pre-plating process of the workpiece during production, and it is strictly forbidden for the residual oxide scale or oil on the surface of the workpiece to enter the nickel tank.
2. The presence of Zn2+ and NO3- impurities in the plating solution.Zn2+ and NO3- impurities will cause black streaks in the nickel layer, increase the internal stress of the coating, make the coating brittle, and cause the coating to fall off in powder form.Therefore, we can use electrolysis to remove Zn2+ and NO3- impurities in the production process.
3. The addition ratio of additives is out of balance.During the replenishment process, the additives should be supplemented according to the proportions in the instructions. When the concentration of brightener is high and the concentration of softener is low, the internal stress of the nickel-plated layer will increase, causing the nickel layer to peel and fall off.When the ratio of additives in the bath is out of balance, 2~3ml/L of H2O2 can be used to decompose the excess brightener, and then the bath is heated to 60~80℃ to remove the excess H2O2.Then add activated carbon and stir for 30 minutes. After standing for 2 to 3 hours, filter, then supplement nickel sulfate and boric acid, adjust the pH value of the plating solution, and add an appropriate amount of softener.
Therefore, when the coating of the workpiece will appear peeling or blistering in the process of using nickel plating additives, we should check the pretreatment of the workpiece, whether the additives are out of balance, and whether it is the influence of impurities.If you are interested in nickel plating additives, please contact Bigolly customer service, you can get free samples and detailed technical information!
If you want to know more about nickel plating, you can click to view "Common problem".
