Chrome free Sealant Zinc Plating Chemicals PN-2
1. A kind of environmentally-friendly sealant which does not contain hexavalent chromium.
2. Can form an organic protective film with good hardness and gloss.
3. Easy to operate. Suitable for the sealing after treating a variety of zinc passivation layers. Can prolong the lifetime of passivation layers.
2. Process Flow
Zinc plating → Wash → Treat with diluted nitric acid → Wash → Passivate → Wash with recycled water → Seal with PN-2 → Dry (60~80°C)
3. Process Parameters
PN-2 Sealant: 10-50% (v/v, the higher the concentration, the thicker the sealing layer is.)
Time: 30-80 seconds
Drying temperature: ＞60°C (the higher the temperature, the shorter the sealing time, but no more than 120°C)