1. FEATURES
Environmentally friendly black passivation without hexavalent chromium, suitable for rack and barrel plating.
A dense black passivation layer can be formed on the zinc nickel alloy coating, which has strong anti-corrosion ability.
The passivation solution has a long service life and is easy to operate and maintain.
2. PROCESS FLOW
Zinc nickel alloy plating (preferably reaching over 8μm)→ Rinsing → Rinsing → Activate → Rinsing→ Immersion in TR-392 → Rinse → Rinse → Sealing → Dry
3. OPERATION CONDITIONS
| Operation Conditions | Optimal | Operating Range |
| TR-391A | 80ml/l | 70-110ml/l |
| TR-391B | 80ml/l | 70-110ml/l |
| pH Value | 1.9 | 1.8-2.3 |
| Passivation Time |
75s |
65-90s |
| Passivation Temperature | 28℃ | 25-35℃ |
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