During the process of using sulfuric acid type matte tin additives, we sometimes find streaks on the coating of workpieces. What is the reason for this?
Based on on-site experience and the characteristics of the sulfuric acid type matte tin additive Sn-808, Bigley Technology has analyzed the following three main points:
1. Insufficient concentration of additives in the plating solution. The appropriate amount of additives in the plating solution has the effect of improving cathodic polarization and refining crystallization, improving the toughness and weldability of the coating. When the concentration of additives in the plating solution is insufficient, the coating is prone to roughness, streaks, and other phenomena. At this time, adding appropriate additives can solve the problem.
2. The cathode current density is too high. In the matte tin process using Sn-808, the cathode current density should be controlled within the range of 1.0~2.0A/dm2. When the current density is too high, the coating will appear rough, loose, striped, and easily burnt edges. Therefore, during the production process, the current density should be appropriately adjusted within the process range.
3. There is metal impurity contamination in the plating solution. When metal impurities such as copper and iron are contaminated in the plating solution, the coating is prone to spots, stripes, pinholes, and other phenomena. Therefore, during the production process, small current electrolysis should be regularly carried out on the plating solution to reduce the impact of metal impurities.
Therefore, we should pay attention to the above three points when using sulfuric acid type matte tin additives to prevent the appearance of stripes on the workpiece coating, and promptly eliminate faults to reduce losses. If you are interested in sulfuric acid type matte tin additives, please contact Bigley customer service to obtain free samples and detailed technical information!
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