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SN-1 Electrolytic Coloring Additive in Sn-Ni salt Bath
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:
  SN-1
NiSO4·6H2O
SnSO4
H2SO4
Deionized Water
15~20g/L
20~25g/L
3.5~6g/L
17~25g/L
balance
2. Operational Parameters:
  Voltage
Temperature
PH value
Time
16~18V
20±5℃
0.7~0.9
1~10min
3. Bath Solution Maintenance:
  (1)Analyze the contents of free H2SO4, SnSO4, NiSO4 and total acid value daily. Every additional 1kg of SnSO4 at the same time add 1.2~1.8 kg of SN-1.   
(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.
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