| This additive is a powdery solid, it is suit to color aluminum profiles anodized, and has good comprehensive properties, stable bath, uniform color and excellent reproducibility. It is easily soluble in water . This additive should be stored in a place avoiding of light and storage time is in one year. |
| 1. Bath Composition (For make-up): |
| |
SN-1
NiSO4·6H2O
SnSO4
H2SO4
Deionized Water |
20-25g/L
20-30g/L
8-10g/L
18-20g/L
balance |
| 2. Processing Parameters: |
| |
Voltage
Temperature
PH value
Time
|
15±2V
20±5℃
0.8-1.2
1-15min |
| 3. Bath Maintenance: |
|
(1) Analyze the contents of free H2SO4, SnSO4, NiSO4 and total acid value daily. The free H2SO4 should not be less than 18g/l and the total acid value should be kept in the range around 30g/l. Addition amount of SN-1 additive is 0.5-1.0kg per addition of 1kg SnSO4.
(2) Add purified water slowly with agitation, so as to prevent the local hydrolysis of SnSO4 which may cause the bath becoming turbid.
(3) After long period of production, there will be white sediment formed in the bottom of the tank that should be cleaned by filtration or decantation. |
