Methyl Sulfonic Acid Matte Tin Additives ; fluoride-free methanesulfonic acid type FF-7725
FF-7725 is a fluoride-free methanesulfonic acid type electroplating dumb tin additive, suitable for rolling operation, stable plating solution, wide operating range, uniform tin plating layer deposition, good welding performance, and can be used in various plating dumb Tin or semi-bright craft .
1. Applicable equipment and materials
1.1 Equipment: Steel troughs of polyethylene, polypropylene, PVC or acid-resistant fiberglass.
1.2 Heating/cooling: need heating/cooling system, Teflon or other acid resistant material.
1.3 Stirring: rack plating, the cathode moves 3-4 m/min, and stirring is not applicable.
1.4 Anode: pure tin anode, use PP anode bag for anode hanging basket.
1.5 Circulation/filtration: A circulation filtration system is required, 4~5 circulations/hour, and the number of filter elements is less than 5~10µm.
1.6 Exhaust system: an exhaust system is required.
2. Bath working conditions
| Project | Rack plating | Barrel plating | ||
| Range | Optimal | Range | Optimal | |
| Tin ion content | 20~30g/L | 25g/L | 12~28g/L | 20g/L |
| Methanesulfonic acid (70%) | 160~180ml/L | 170ml/L | 170~190ml/L | 180ml/L |
| FF-7725A additive | 25~40ml/L | 30ml/L | 25~50ml/L | 30ml/L |
| Temperature | 18~30℃ | 25℃ | 18~30℃ | 25℃ |
| Cathode current density | 2.0~4.0 ASD | 3.0 ASD | 0.2~2.0 ASD | 1.0 ASD |
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