In addition to zinc protection, the organic coating on the zinc layer plays a role of covering and isolation, which can prevent the steel plate from rusting. The service life of the coated steel plate is longer than that of the galvanized steel plate. According to the introduction, the service life of the coated steel plate is 50% longer than that of the galvanized steel plate. However, in different areas and different parts of use, using the same amount of zinc plating, the same coating, the same coating thickness of color coated plate, its service life will be very different. For example, in industrial areas or coastal areas, due to the action of sulfur dioxide gas or salt in the air, the corrosion rate is accelerated and the service life is affected. In rainy season, the coating will be corroded quickly and its service life will be reduced if it is soaked by rainwater for a long time, or if the temperature difference between day and night is too large and easy to condense. Buildings or factory buildings made of color coated steel plates often have a long service life when washed by rainwater. Otherwise, they will be affected by sulfur dioxide gas, salt and dust. Therefore, in the design, the larger the inclination of the roof, the less likely it is to accumulate dirt, such as dust, and the longer the service life; for those areas or parts that are not frequently washed by rainwater, they should be washed with water regularly. Home appliances: 31% construction: 63% others: 6% Printing color steel plate is widely used. It has no pollution, excellent weather resistance, corrosion resistance, high processing and other characteristics. Printing color steel plate is widely used in construction, home appliances, transportation, packaging, machining, interior decoration, medical treatment, automobile industry, etc.