JW-819 Trivalent Chromium Black Passivation Agent
Category:
Detailed description:
01
Suitable for cyanide-free alkaline zinc rack plating, yielding a uniform black finish.
02
Environmentally friendly, free of harmful metals such as hexavalent chromium and silver.
03
Easy to operate and maintain
04
Excellent corrosion resistance; when used in conjunction with a sealant, it achieves a neutral salt spray test duration of over 96 hours.
Process and Operating Conditions
Galvanizing—Triple‑stage water rinsing—Activation—Water rinsing—Trivalent chromium black passivation—Water rinsing—Drying—Immersion in black oil—Baking (at 120°C or higher)
Operating conditions
| Project | Scope | Optimal value | |
| Passivation agent bath preparation | JW-819A:80-120ml/L | JW-819A:100ml/L | |
| JW-819B:40--60ml/L | JW-819B:50/L | ||
| pH value | 1.0-2.5 | 2.0 | |
| Temperature | 20-35℃ | 25℃ | |
| Passivation time | 20–45S | 25S | |
| Stirring method | Air stirring | Air stirring | |
| Project | Scope | Optimal value | |
| JW-895 Universal Black Matte Water-Based Oil | 1000---750ml/L | 1000ml/L | |
| pH value | 7-9 | 8 | |
| Temperature | 80–150℃ | 120℃ | |
| Time | 5-15s | 10s | |
| Stirring method | Static | Static | |
Keywords:
JW-819 Trivalent Chromium Black Passivation Agent
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