PN-4 Black Nano sealant ; Chrome free Sealant Zinc Plating Chemicals
1. Properties
1. Completely free of any hexavalent chromium and silver material, completely environmentally friendly high-tech.
2. The black color is not produced from nickel salt reaction.
3. Suit for various zinc plating, and can produce a uniform black appearance.
4. Get white rust from neutral salt spray test up to 145h or more.
2. Process
Zinc plating → Washing for twice → Immerse nitrate (0.5%) → Washing for twice → passivation → Washing with deionized water for twice → Drying by centrifuge → Sealing with PN-4 → Centrifugal drying(15 seconds, 250RPM) → Curing (80 ℃, 30min)
3. Operating instructions
Preparation | Operation range | Best operation |
PN-4 | Original solution | Viscometer 10 seconds |
Immerse time | 10-20s | 15s |
Temperature | 20-30℃ | 25℃ |
Baking temperature | 60-80℃ | 80℃ |
Bath material | Acid-resistant plastic lining steel bath | / |