In the production process of using bright acid tin plating solution, sometimes the coating at the corners of the workpiece is scorched. What is the reason?
Bigolly Technology made an analysis based on the field experience and the characteristics of the product's bright acid tin plating solution Sn-807, mainly for the following 4 reasons:
1. The cathode current density is too large. When the cathode current density is too large, the tin-plated layer is loose, rough, and porous, and the edges and corners are easily scorched and brittle.Therefore, we should control the current density within the normal range.
2. The concentration of divalent tin in the plating solution is too low. When the concentration of divalent tin in the plating solution is too low, the low current density of the cathode will be low, the production efficiency will also be reduced, and the coating will be easily scorched.Therefore, we should analyze and adjust the divalent tin concentration in the plating solution in a timely manner during production to be within the normal range.
3. The cathode of the plating solution is not moving fast enough. During the use of bright acidic tin plating solution, the plating solution cannot be stirred with air, and the bright plating layer must be obtained by moving the cathode, which can improve the production efficiency.When the moving speed of the cathode is not fast enough, the tin plating layer will be rough and easy to burn, so the moving speed of the cathode should be adjusted in time.
4. The softener content in the plating solution is insufficient.The softener can improve the dispersion ability of the plating solution, improve the cathodic polarization, refine the crystallization of the plating layer, and reduce the pores.When the softener in the plating solution is insufficient, the dispersibility of the tin plating layer decreases, the crystals are relatively rough, and it is easy to burn.Therefore, an appropriate amount of softener should be added to the normal range in a timely manner.
Therefore, we need to pay attention to the above four points in the production process of using bright acid tin plating solution, which can effectively avoid the phenomenon of scorching of the coating at the corners of the workpiece and reduce the occurrence of failures.If you are interested in bright acid tin plating solution, please contact Bigolly customer service, you can get free samples and detailed technical information!
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