Sketch map of sectional structure of prepainted steel sheet

1.CRC（Base metal）
Mainly responsible for stiffness and strength functions
2.Zinc Coating
It has the functions of corrosion resistance, heat resistance, weather resistance and machinability.
3.Chemical Coating
Improve the adhesion function and anti-corrosion function of the coating and the substrate
4.Primer Coating
Enhance the adhesion between the surface of the steel plate and the paint, and have the function of suitable color tone
5.Top coating（Finish coating）
In addition to the function of the primer coating, it also has the ability to resist powdering and peeling, wear resistance,
proper hardness, gloss and hue function.