In the process of using acid tin plating additive, sometimes the coating of the workpiece will be rough and porous. What is the reason?
According to the site experience and the characteristics of acid tin plating additive Sn-807, Bigolly Technology analyzed the following three points:
1. The concentration of tin salt in the bath is too high.When the concentration of tin salt in the bath is too high, the dispersion ability of the bath will be reduced, the glossiness of the coating will be darkened, the crystal will be rough, and it will appear more porous.In this case, dilute the plating solution or increase the content of sulfuric acid in time.
2. The cathode current density is too high.If the current density is too high, the tin coating is easy to appear rough, loose and porous, the edge is easy to burn, and the brittleness is also relatively large.Therefore, the current density should be strictly controlled within the process range during production.
3. There are many solid impurities in the plating solution.With the progress of production, when there are too many solid impurities in the plating solution, the color of the plating solution will be deepened, and the coating is easy to appear rough, loose, brittle, stripes or pinholes.Therefore, we should use activated carbon to treat and filter the plating solution in the production process. The anode plate should be covered with an anode bag to reduce the anode sludge entering the plating solution.
Therefore, we should pay attention to the above three points when the coating of the workpiece is rough, loose and porous in the production process of using acid tin plating additive, and eliminate the cause of the fault in time to reduce the loss caused by the fault.If you are interested in acid tin plating additives, please contact Bigolly customer service for free samples and detailed technical information!
If you want to know more about tin plating, you can click to view "Common problem".