Chrome free Zinc sealing agent PN-7
Properties
1. PN-7 does not contain hexavalent chromium.
2, After drying, it can increase the surface hardness and scratch resistance.
3 PN-7 can form a layer of transparent organic protective film, generally does not affect the original color of the passivation layer.
4. It ican protect the color of passivation layer for a longer time.
Process Parameters
PN-7 Sealant: 5-10% (The sealing agent will flocculate under acidic conditions, so the pH value of the added water must be higher than 7.0)
Temperature: room temperature
Time: 5-15 seconds
pH: 8-9(It can be adjusted with diluted ammonia and ethanolamine)
Drying temperature: 60-80°C
Tank material: stainless steel, plastic or steel tank with a plastic liner. For barrel plating, a separator is required.
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