It is an environmentally-friendly trivalent chromium passivate without hexavalent chromium.
It can form a tight, uniform and transparent natural color passivate layer on zinc-nickel alloy plating layer with strong anti-corrosion ability.
The passivation solution has a long service life and is easy to operate and maintain.
1. PROCESS FLOW
Zinc-nickel alloy plating → Washing → Gloss Forming → Washing → Immersing in the TR-393 Solution → Washing → Sealing → Drying
2. BATH COMPOSITION AND OPERATING CONDITION
| Parameter | Best | Range |
| TR-393 | 70 ml/L | 50~100 ml/L |
| pH | 3.5 | 3.5~4.0 |
| Time | 40 seconds | 30~60 seconds |
| Temperature | 30°C | 25~40°C |
Note: The specific operating conditions are adjusted according to the actual situation, as the operating conditions are different for new and old working solutions or the concentration of working solutions, and the operating parameters are adjusted accordingly with the change of passivation working solutions.
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