About color coated steel coil

Color-coated coils use hot-dip galvanized sheets, hot-dip galvalume sheets, electro-galvanized sheets, etc. as substrates. After surface pretreatment (chemical degreasing and chemical conversion treatment), one or several layers of organic coatings are coated on the surface, and then A product that is baked and solidified. Colored steel coils are also named because they are coated with organic coatings of various colors, referred to as color-coated coils. Color-coated rolls are lightweight, beautiful and have good anti-corrosion properties, and can be processed directly. The colors are generally divided into gray and white, sea blue and brick red. They are mainly used in the advertising industry, construction industry, home appliance industry, electrical appliance industry, furniture industry and transportation. Industry. Color-coated steel coil structure:
Color-coated coiled materials consist of topcoat, primer, coating, base material and backcoat.

Topcoat: Blocks sunlight and prevents ultraviolet rays from damaging the coating; when the topcoat reaches the specified thickness, it can form a dense shielding film to reduce the permeability of water and oxygen. Primer: It helps to strengthen the adhesion with the substrate, making the paint film less likely to desorb after being exposed to water. It also improves corrosion resistance, because the primer contains corrosion-inhibiting pigments, such as chromate pigments, which make the anode Passivation to improve corrosion resistance.

Coating: Generally galvanized or galvanized, this part has the greatest impact on the service life of the product. The thicker the coating, the better the corrosion resistance.

Base material: Generally cold-rolled plate. Different strengths determine the mechanical properties that the color-coated plate can withstand.

Back paint: The function is to prevent steel plate corrosion from the inside. It is generally a two-layer structure (2/1M or 2/2, primer + back paint). If the back needs to be bonded, it is recommended to use a single-layer structure (2/1).