What are the environmental factors that affect the color coated steel?

1 Temperature. The high-temperature coating is easy to soften and the corrosion medium is easy to adhere to. Easy to penetrate into the substrate, high-temperature water oxygen content will increase at a certain temperature corrosion rate will be accelerated.
2. Humidity. The substrate corrosion of the cut and processing damage of the color coating plate belongs to electrochemical corrosion, and low humidity is not easy to form corrosion battery (i. e. Electrochemical Circuit) .
3. Temperature difference between day and night. Large temperature difference is liable to dewing, forming galvanic corrosion conditions on exposed metals. In addition, the large temperature difference also leads to frequent hot and cold deformation of the coating, which will accelerate the aging of the coating and loosen it.
4. Sunshine time and intensity. Orientation and slope affect the duration of sunlight, thus affecting the durability of the coating. The gradient also affects the setting time of the corrosion medium or dust on the steel plate. Sunlight is an electromagnetic wave, divided into gamma rays, x-rays, ultraviolet rays, visible light, infrared rays, microwave and radio waves according to their energy and frequency. Waves and radio waves have low energies and do not interact with matter. Infrared Light also belongs to the low-energy spectrum, which can only stretch or bend the chemical bonds of substances, but not break them. Visible light gives everything a rich color. UV spectrum is a high-frequency radiation, it has more destructive power than the low-energy spectrum. As we know, dark spots and skin cancer are caused by ultraviolet rays from the Sun. Similarly, UV can break chemical bonds in substances, causing them to break. This depends on the wavelength of the UV and the chemical bond strength of the substance. X-rays can be penetrating, and gamma rays can break chemical bonds and create free, charged ions that are lethal to organic matter, but are rare in sunlight. Therefore, from above, it can be seen that the sunshine time and intensity affect the structural stability of the coating, especially in areas with strong ultraviolet radiation.
5. The amount and acidity of rainfall. There is no doubt that high rainfall acidity is detrimental to corrosion resistance. However, the rainfall has a dual effect on the wall panels and the roof panels with high slope. The rainfall has the effect of cleaning the steel plate surface and washing away the corrosion products on the surface, but for the roof panels with low slope and the parts with poor drainage, heavy rainfall tends to aggravate corrosion.
6. Wind direction and speed. Wind direction and speed act like water, and often with it. It is a test of material connections because the wind can loosen them and rain can seep into the interior of a building.
Seven. Corrosive deposits. Such as chlorine ion, sulfur dioxide and other corrosion are accelerated, these deposits occur in the seaside, industrial pollution more serious areas (such as power plants, smelters, etc.) .