The color-coated galvanized steel plate is based on galvanized steel, in addition to zinc protection, the organic coating on the zinc layer plays a role in covering and isolating, preventing rusting of the steel plate and prolonging the service life. It is introduce that the life of color-coated galvanized steel plate is 50% longer than galvanized steel. However, in different regions and different parts, use of the same amount of zinc coating, paint, and thickness of the coating color coating plate, the service life will be different.
For example, in industrial or coastal areas, the service life is affected by the accelerated corrosion due to the effects of sulfur dioxide gas or salt in the air. In the rainy season, the coating is wet by the rain for a long time, or the area where the temperature difference between day and night is too easy to dew. It will be quickly corroded and the service life will be reduced. Therefore, when designing, the more inclined the roof, the less accumulate dust and other dirt, the longer service life.