We use high-sulfur nickel additives to obtain a very thin nickel punching layer between the bright nickel layer and the semi-bright nickel layer, which is far more active than the other two layers.The potential difference between the high-sulfur nickel layer and the bright nickel layer can be increased by at least 20mv, which can improve the anti-corrosion effect of the nickel layer.When we plated high-sulfur nickel on the nickel-plated layer, but the potential difference between the nickel layers did not increase, what should we do?
Bigolly Technology made an analysis based on the field experience and the characteristics of the product high-sulfur nickel additive Ni-320, mainly for the following three reasons:
1. The pH value of the plating solution is too low.The quality of the coating has a great relationship with the pH value. If the pH value is too low, the effect of the potential difference will be affected, and the corrosion resistance of the coating will also be affected.Therefore, we should control the pH value of the plating solution within the process range during production.
2. The sulfur content of the coating is too low.Under normal circumstances, the sulfur content of the high-sulfur nickel layer should be controlled at 0.15~0.2%, which can control the potential difference of the multi-layer nickel.When the sulfur content in the coating is too low, the potential difference of the coating cannot be increased.Therefore, we should control the sulfur content of the coating during production.
3. The quality of high-sulfur nickel additives is poor.Some additives on the market are of poor quality, and the potential difference of the coating will gradually decrease during the production process.It is recommended to use the high-sulfur nickel additive Ni-320 of Bigolly Technology, which has good chemical stability, can stabilize the potential difference of the coating layer and keep the potential difference between the bright nickel layer and the semi-bright nickel layer at 160~180mv.
Therefore, choosing a high-sulfur nickel additive with good quality, controlling the pH value of the bath and the sulfur content of the coating, can stably control the potential difference and corrosion resistance of the coating.If you are interested in high-sulfur nickel 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".