FF-7800 Cyanide Free Silver Plating Process
1. Features
The silver layer of FF-7800 cyanide-free silver plating process is matte silver, with good stability of the plating solution and easy maintenance; high current efficiency, good dispersing and covering ability; cyanide-free formula greatly reduces the pollution of the environment; the plating layer has good weldability, good conductivity, and good resistance to discolouration; and it can be applied in the industries of electrical appliances, electronics, telecommunication equipments, and instrument and meter manufacturing.
2. Process flow:
Pretreatment → Water washing → Activation → Water washing → Pre Silver Plating → Silver Plating → Recovery → Water washing → Water washing → Anti colour change treatment → Pure water washing (Temperature 50℃) → Pure water washing → Drying
3. Pre-silver plating solution components:
| Item | Standard | Range |
| Silver Nitrate | 2 g/L | 1~3 g/L |
| FF-7800A | 350 ml/L | 250~350 ml/L |
| Pure water | Remainder | Remainder |
4. Pre-silver plating operation conditions
| Operation conditions | Range |
| Cathode current density | 0.05~0.1A/dm2 |
| pH | 9~10.5 |
| Temp | 20~30℃ |
| Filter | Continuous filtration |
| Anode | Silver plate |
5. Cyanide-free silver plating solution components:
| Item | Standard | Range |
| Silver Nitrate | 28 g/L | 25~30 g/L |
| FF-7800M | 600 ml/L | 500~700 ml/L |
| Pure water | Remainder | Remainder |
6. Cyanide-free silver plating operation conditions
| Operation conditions | Standard | Range |
| Cathode current density | 0.5A/dm2 | 0.3~1.0A/dm2 |
| Cathode/anode area ratio | 1 : 2 | 1 : 2~4 |
| pH | 9.5 | 9~10.5 |
| Temp | 38℃ | 35~45℃ |
| Filter | Continuous filtration | Continuous filtration |
| Stirring (cathode movement) | 3～4 m/min | 3～4 m/min |
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