June 5, 2017 4:14 AM
Color coated steel sheet is based on galvanized steel sheet. The organic coatings on the zinc layer have covering isolation effect except for the protection of zinc, which is applied to the steel for rust protection and the life time is longer than galvanized steel sheet. As we know, the life time of coated steel sheet is 50% longer than galvanized steel sheet. However, if we use the same amount of zinc, paint and thickness but in use of different areas and parts, the life time will be very different.
For example, in industrial areas or coastal areas, due to the effect of SO2 in the air or salt, the corrosion rate is accelerated and then affect the life time. During the rainy season, because of coating soaked by rain for a long time or the easy condensation sites under the condition of day and night temperature difference is too high, the coated steel sheet will quickly be corroded, which will make service life reduce. Buildings or factories with color coated steel sheet can have a longer life when they often rushed by rain. Otherwise, it will affect the use of the color coated steel sheet because of SO2, salt and dust. Therefore, the greater the slope of the roof, the less likely it is to gather dust and the longer life it will have. For the parts of color coated steel sheet that are not frequently washed by the rain should be washed with water regularly.
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