During the process of using matt tin additives, sometimes the poor coverage of the tin coating on the workpiece can seriously affect the performance and service life of the workpiece. What is the reason for this phenomenon?
Based on on-site experience and the characteristics of the product matte tin additive Sn-808, Bigley Technology has analyzed the following four main points:
1. The content of stannous sulfate in the plating solution is too high. Generally, in plating solutions using Sn-808, the content of stannous sulfate should be controlled within the range of 24 to 45 g/L. When the content of stannous sulfate is too high, the dispersion ability of the plating solution decreases, the coverage ability of the plating layer decreases, the color becomes dark, and the plating layer is relatively rough.
2. The sulfuric acid content in the plating solution is too low. Sulfuric acid can prevent the hydrolysis of stannous oxide and improve the conductivity of the plating solution. When the content of sulfuric acid in the plating solution is too low, the current efficiency of the cathode decreases, and the workpiece cannot obtain a good tin coating, resulting in poor coating coverage.
3. The concentration of additive Sn-808 is too low. Sn-808 has the effect of refining the crystallization of the plating layer and improving cathode polarization. When the concentration of Sn-808 is too low, the tin coating has poor coverage ability and the crystallization is relatively rough. During the production process, 2-3 ml/L of Sn-808 can be gradually added to the plating solution to improve the covering ability of the plating solution.
4. The temperature of the plating solution is too high. In the plating solution using Sn-808, the temperature of the plating solution should be controlled at 15-25 ℃. When the temperature of the plating solution is too high, the turbidity and precipitation of the plating solution will increase, and the coating will be rough, uneven, and easy to burn. During the production process, the temperature of the plating solution should be controlled to ensure uniform and smooth plating.
Therefore, during the use of matt tin additives, the above four points should be noted, the concentration of each component in the plating solution should be controlled, and the maintenance of the plating solution should be strengthened to ensure good coating coverage. If you are interested in matte tin electroplating additives, please contact Bigley customer service for free samples and detailed technical information!
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