Color-coated board adopts high-quality substrate

The color-coated board adopts high-quality substrates, and the requirements for the surface, shape and dimensional accuracy of the substrates are getting higher and higher. For outdoor use, such as small spangle flat hot-dip galvanized steel coils and non-spangle flat hot-dip galvanized steel coils, they are released in time. The rise of zinc alloy hot-dip coil; indoor use such as electro-galvanized steel coil, film cold-rolled sheet and aluminum coil. Improve the pretreatment process and pretreatment liquid, the number of equipment is small, the cost is low, and it has become the mainstream process, and the stability, corrosion resistance and environmental protection performance of the pretreatment liquid are continuously improved.