Color steel plate is based on cold-rolled steel plate and galvanized steel plate, otherwise, due to the effect of sulfur dioxide gas, salt and dust, it will affect the use. Therefore, in the design, if the inclination of the roof is large, it is not easy to scale and other dirt, and the service life is long; for those areas or parts that are not often washed by rain, the strip steel shall be washed with water regularly on the continuous unit for cold rolling. As the coating is before the steel plate forming and processing, it is called precoated steel plate in foreign countries.
After surface pretreatment ( degreasing , cleaning, chemical conversion treatment), the method of continuous painting (roller coating method ), in addition to the protection of zinc, the organic coating on the zinc layer covers the isolation function, which can prevent steel from rusting, and the service life of the coating on the steel plate is longer than that of the galvanized steel plate, and the service life of the coating on the steel plate is 50% longer than that of the galvanized steel.
However , when it is used in different areas and different parts, the service life of color galvanized steel with the same thickness will be very different. For example, in industrial areas or coastal areas, the speed of corrosion is accelerated, and sulfur dioxide gas or salt in the air will affect the service life. In the rainy season, the coating is soaked by rainwater for a long time. The galvanized strip steel ( electro galvanized and hot galvanized ) of baked and cooled products is used as the base plate. After surface pretreatment ( degreasing and chemical treatment) one or more layers of liquid coating are applied by roller coating, and then the coated steel plate is baked and cooled. Because paint can have many colors.
The main production process of common double coating and double drying continuous color coating machine is : uncoiling → pretreatment → coating → baking → post treatment → winding.
Coated steel plate has bright, beautiful and good anti-corrosion performance, and can be directly treated. It provides a new construction industry of raw materials, shipbuilding industry, automobile manufacturing industry, furniture industry, electronic industry, etc., to replace wood and steel, efficient construction, energy saving, pollution prevention and other good effects.
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