In a metal pretreatment/powder coating context, these chemicals typically affect the metal by:
Removing oil and grease (degreasing)
Removing rust and scale
Cleaning the surface
Creating a phosphate conversion coating
Improving paint/powder coating adhesion
Increasing corrosion resistance
Before Treatment
Oil, grease, rust, dust, and oxide layers are present.
After Degreasing
Surface becomes chemically clean.
After Phosphating
A thin phosphate crystal layer forms on the metal.
Better paint/powder coating adhesion.
Increased corrosion resistance.
After Passivation
Phosphate coating is stabilized.
Improved salt-spray and humidity resistance.
Typical Benefits of the 7-Tank Process
✅ Better powder coating adhesion
✅ Improved corrosion resistance
✅ Reduced paint peeling and blistering
✅ Increased coating life
✅ Uniform surface finish
Technical Statement:
The chemicals used in the 7-tank phosphating process clean the metal surface, remove contaminants and oxides, form a protective phosphate conversion coating, and improve the adhesion and corrosion resistance of subsequent paint or powder coating systems.
