1. Surface Treatment
Rust Removal: The steel coil surface is treated to remove rust, usually through pickling or other chemical methods to eliminate iron oxide.
Phosphating: A phosphate coating is formed on the steel surface through a chemical reaction to improve the adhesion of the paint coating.
Cleaning: The surface is washed with water to remove residual acid or impurities, ensuring it is clean.
2. Pre-Coating Treatment
Primer Coating: A layer of primer is applied before the main coating to enhance adhesion and improve corrosion resistance.
Drying: After applying the primer, the steel coil is dried using heat to ensure the coating is fully cured.
3. Coating Application
Color Coating: The steel coil is coated with colored paint using a roller coating or spray method.
Curing: The coated steel is then passed through a curing oven to ensure proper adhesion and durability of the paint layer.
4. Cooling and Finishing
Cooling: The coated and cured steel coil is cooled down to room temperature.
Protective Film Application (Optional): A protective film may be applied to prevent scratches during handling and transportation.
Coil Rewinding: The final color-coated steel is wound into coils for storage and shipment.
This process ensures the production of high-quality color-coated steel coils with excellent durability, corrosion resistance, and aesthetic appeal.
