| This additive is a light-green liquid that can stabilize Sn2+ion efficiently and improve color-uniformity and reproducibility. This additive should be stored in a place avoiding of light and the storage time is in one year. |
| 1. Bath Composition (For make-up): |
| |
H2SO4
BY-C11
SnSO4
Deionized Water
|
12-18g/L
50g/L
10-15g/L
balance |
| 2. Processing Parameters: |
| |
Voltage
Temperature
pH value
Time
|
15±2V
20±5℃
0.8-1.2
30sec-15min |
| 3. Bath Maintenance: |
|
(1) Analyze the pH value and contents of free H2SO4 and SnSO4 daily, recompensed SnSO4 and H2SO4 in accordance with processing requirement. The compensation ratio between BY-C11 and SnSO4 is 1:1.
(2) Add purified water slowly with agitation, so as to prevent the local hydrolysis of SnSO4 which may cause the bath solution 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. |
