In the production process of using matte tin additives, sometimes there may be black spots or black spots on the workpiece coating, which affects the quality of the coating. What is the reason for this?
Bigely Technology has conducted an analysis based on on-site experience and product characteristics, mainly for the following three reasons:
1.Organic decomposition products contaminate the plating solution. These organic decomposition products accumulate in the plating solution, causing the color of the plating solution to deepen and the viscosity to increase, which can lead to problems such as brittleness, stripes, and black spots in the coating. Activated carbon with a concentration of 1-3 g/L should be used regularly for adsorption and removal.
2.Metal impurities (such as copper, nickel, zinc, iron, etc.) contaminate the plating solution. When the plating solution is contaminated with metal impurities, it can cause the coating to turn black, resulting in black spots or black spots. Low current density electrolysis can be performed to remove some metal impurities.
3.The cathode current density is too low. The current density is low, and the coating may contain heavy metal impurities or particle impurities, resulting in black spots or black spots on the coating. The current density should be increased within the process range.
So, when producing tin plating, we should pay attention to the above three points to avoid the phenomenon of black spots or black spots on the workpiece coating, and to better use matte tin additives. If you are interested in matte tin additives, please contact Bigley customer service for free samples and detailed technical information!
