CT-95 high-performance KCl galvanized brightener is a new type brightener developed though our long-term research and practice. It has broad range of current density, broad range of permitted temperature and high brightness, so it is suitable for low-chrome or extra low-chrome passivation. The brighter contains make-up A and additive B.
Technology and working condition
| Raw material and working condition |
Range |
|
ZnCl2 |
60-70g/L |
|
KCl |
180-220g/L |
|
H3BO3 |
25-35g/L |
|
CT-95A（make-up） |
15-20ml/L |
|
PH |
5-6 |
|
Temperature |
15-55℃ |
|
Current density |
0.5-4.0A/dm2 |
|
Cathode and anode ratio |
1：1.5-2 |
|
Anode |
0＃ or 1＃ zinc plate |
|
Rolling speed |
10-15r/min |
|
CT-95B（additive） |
300-50ml/KAH（consumption） |
Preparation
- Take one half of total volume hot water (50℃) to dissolve measured KCl; add ZnCl2 into it; and then mix them entirely till dissolve.
- Dissolve measured H3BO3 with boiling water and then pour the above solution into it. Add water to regulated volume.
- Add 0.5ml/L H2O2. Mix it for 1.5-2h and place it still for filtration. Regulate PH value to 5.5 with HCl or NaOH; and then add CT-95A (make-up) before electroplating.
Maintenance and management
- Pretreatment has to be done entirely, or bonding force will not be good.
- Test it every week to keep component content within technical range.
- The solution is easy to be polluted by iron impurity, so it has to be processed with 3% H2O2 for 2-3 times every day.
- Solution PH value shall increase gradually, but it may be regulated with 10% HCl.
Storage and transportation
This product is brown-red liquid, belongs to un-
dangerous product. So it is supposed to be stored in dark room. |
