Tin Base Electrolytic Coloring Additive
LW-53 Sn Salt Electrolytic Coloring Additive is a kind of creamy-white to grey-brown crystal for coloring to aluminum profile after anodizing with advantages of good comprehensive properties, solution stabilization, good homogenization and reproducibility. It can be dissolved easily in water and keep stable performance.
1. Bath Make-up:
Name | Quantity | Unit |
LW-53 | 20 | g/L |
Sulphuric Acid Reagent | 15 | g/L |
Stannous Sulfate (SnSO4) | 6-13 | g/L (light color: 6-8 g/L, dark color:8-13 g/L) |
Deionized Water | Balance |
2. Operating Conditions:
Name | Quantity | Unit |
Sulphuric Acid (H2SO4) | 15-23 | g/L |
SnSO4 (stannous sulfate) | 6-15 | g/L |
Temperature | 20±3 | ℃ |
Voltage | 18±2 | V |
Time | Depends on the depth of color | |
3. Solution Maintenance:
1) Analyze the concentration of free sulphuric acid, stannous sulfate and total acid daily. Maintain the concentration of free sulphuric acid above 15g/L and total acid around 30g/L. To increase the stannous sulfate by 1 kg, add 1.5 kg of LW-53.
2) The pure water is suggested be added slowly with stirring to prevent the hydrolysis of stannous sulfate and cause solution turbidity.
3) There will be white precipitations in long-term production. So the bath should be filtered and cleaned regularly.
4. Packaging and Storage:
Package: Plastic woven bag (20kg/bag)
Storage: Suggested to store in cool, dry and well ventilated place; away from fire and heat source， and avoid light storage.
