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Classification of Prepainted Galvanized Steel Coil
Earlier we introduced what is Prepainted Galvanized Steel Coil. It is mentioned that Prepainted Galvanized Steel Coil uses hot-dip galvanized sheet, hot-dip galvanized steel sheet, electro-galvanized sheet, etc. as the substrate. After surface pretreatment (chemical degreasing and chemical conversion treatment), a layer of or Several layers of organic coatings, followed by baking and curing products. So it can be seen from this that the classification of Prepainted Galvanized Steel Coil is distinguished by these three substrates.
Prepainted Galvanized Steel Coil hot-dip galvanized substrate
The product obtained by coating the organic paint on the hot-dip galvanized steel sheet is the hot-dip galvanized color-coated steel sheet. In addition to the protective effect of zinc, the hot-dip galvanized color-coated sheet also has an organic coating on the surface to insulate and protect and prevent rust, and has a longer service life than hot-dip galvanized sheet. The zinc content of the hot-dip galvanized substrate is generally 180g/m2 (double-sided), and the maximum zinc content of the hot-dip galvanized substrate for building exterior is 275g/m2.
Prepainted Galvanized Steel Coil hot-dip aluminum-zinc substrate
Hot-dip aluminum-zinc steel (55% Al-Zn) is used as the newly coated substrate, usually containing 150g/㎡ (double-sided) of aluminum and zinc. The corrosion resistance of hot-dip galvanized sheet is 2-5 times that of hot-dip galvanized sheet. Continuous or intermittent use at temperatures as high as 490 ℃ will not severely oxidize or produce scale. The ability to reflect heat and light is twice that of hot-dip galvanized steel, and the reflectivity is greater than 0.75, which is an ideal building material for energy saving.
Prepainted Galvanized Steel Coil
The electro-galvanized sheet is used as the substrate, and the product obtained by coating with organic paint and baking is electro-galvanized color-coated sheet. Because the zinc layer of the electro-galvanized sheet is thin, the zinc content is usually 20/20g/m2, so this product is not suitable for use Make walls, roofs, etc. outdoors. But because of its beautiful appearance and excellent processing performance, it can be mainly used for home appliances, audio, steel furniture, interior decoration, etc.
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