Role of Phosphating Chemical in a 7-Tank Process
In a 7-Tank Pretreatment Process, the Phosphating Chemical is used to create a thin phosphate coating on the metal surface before powder coating or painting.
Functions of Phosphating:
Improves Paint Adhesion
Provides a rough and active surface for better bonding of powder coating or paint.
Enhances Corrosion Resistance
Protects the metal from rust and corrosion.
Increases Coating Life
Improves the durability and performance of the final powder-coated finish.
Creates a Uniform Surface
Ensures consistent coating quality across the entire metal part.
Reduces Under-Film Corrosion
Prevents paint peeling and rust formation beneath the coating.
7-Tank Process
Tank Process
1 Degreasing
2 Water Rinse
3 Derusting / Pickling
4 Water Rinse
5 Phosphating
6 Water Rinse
7 Passivation / Final Rinse
“Phosphating is a chemical conversion coating process that forms a protective phosphate layer on metal surfaces, improving paint adhesion, corrosion resistance, and overall coating performance before powder coating.“
