Color-coated steel sheets-also known as profiled color-coated steel sheets-are composite materials produced by taking cold-rolled steel sheets as a substrate, applying an organic coating following surface pretreatment, and subsequently curing the coating through baking.
A color-coated steel sheet consists of four components: the substrate, a chemical conversion layer, a primer layer, and a topcoat layer. The substrate, typically cold-rolled or galvanized steel, provides fundamental structural strength. The chemical conversion layer-formed via chromate or phosphate treatment-enhances the adhesion of the coatings. The primer layer, often composed of epoxy resin, provides rust protection, while the topcoat layer-typically made of materials such as polyester or silicone-modified polyester-imparts weather resistance and decorative qualities. Through a roll-forming process, the sheets are shaped into specific profiles (such as the "880" pattern), which improves structural stability while facilitating drainage and installation.