How to choose coated steel plates is an important issue in use, to avoid waste or material performance that cannot meet the use requirements
Hot-dip steel plates have many uses in construction. In order to further improve the corrosion resistance of hot-dip galvanized steel sheets, the surface zinc layer is not directly in contact with the air, and the surface coloring is increased, so that coating processing can be performed
That is, according to different uses, it is necessary to select suitable substrates and color films, and adopt appropriate coating methods to produce coated steel sheets that meet performance requirements
Coated steel sheet substrate
Generally, the selection of coated steel sheets can be carried out according to the following aspects
1. Selection of substrates (substrate strength, galvanizing amount and surface finishing, etc.)
2. Selection of color films (color, performance and use of color films)
The substrate can be cold-rolled substrates, electrogalvanized substrates, hot-dip galvanized substrates, and aluminum-zinc-coated steel sheets, but it is necessary to select materials with appropriate mechanical properties according to different uses
Electrogalvanized substrates
The coated steel sheets of electrogalvanized substrates have higher corrosion resistance than cold-rolled substrates due to the protection of the zinc layer. Because the zinc layer is thin (generally the zinc content is 20g/m2), its processing performance is better than hot-dip galvanizing.
When making products and components that require corrosion resistance, you can consider using electrogalvanized steel sheets as the substrate for coated panels. Such as the internal and external components of air conditioners, washing machines or refrigerator shells; interior decoration walls, furniture, lighting equipment, signs, etc.
Hot-dip galvanized substrates
Hot-dip galvanized substrates can be selected according to the amount of galvanizing, zinc layer morphology and surface finishing.
1. Galvanizing amount
Different galvanizing amounts are selected according to different use environments. The galvanizing amount of hot-dip galvanized sheets used for coating is usually 180 g/m2 (double-sided). In industrial and coastal areas, it is best to use 275 g/m2 (double-sided) galvanizing.
2. Zinc layer morphology and surface finishing
The formability of zinc-iron alloyed hot-dip galvanized sheets is worse than that of ordinary hot-dip galvanized sheets, so ordinary hot-dip galvanized sheets are generally used as substrates. Usually, hot-dip galvanized sheets with ordinary zinc spangles, small zinc spangles and no zinc spangles can be used as substrates. In order to change the surface condition of hot-dip galvanized sheets and make them suitable for lamination, they are generally flattened (or polished) and straightened.
Aluminum sheet substrate
Aluminum sheets are mostly used as substrates for roofs and walls. Aluminum has good corrosion resistance. Under similar conditions, the life of galvanized steel sheets with the same coating thickness is about four times that of galvanized steel sheets. It has a pleasing light silver-gray and bright appearance.
The types of color films are generally selected according to the purpose, occasion of use, and degree of processing of the product. Generally, PVC color films are used for coated steel sheets used in buildings, and PET, aluminum foil, and PVC films are used for household appliances. Antibacterial films and fireproof films can also be selected for special performance requirements.
In general, the standard texture of the manufacturer can be selected, which can shorten the workload in the early stage of production. If special colors are required, they can also be developed and customized.
