Color coated steel plate(PPGI) selection and use

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Color coated steel plate is a green environmental protection building material, how to choose the appropriate color coated steel plate and then cooperate with the appropriate pressure plate design, can not only meet the safety factor of the building but also reduce the project cost. How to correctly select materials, rational use, improve the service life of color coated steel plate is the most concerning problem of the majority of owners and project builders. So today I make up for you to bring color-coated plate material-related knowledge, I believe that the related people in the process of material selection some more professional vision, together to see.

  • The influence of environment on material selection in different areas.
  1. Temperature:
    High temperature, softening coating, corrosion medium easy to adhere to. Easy to permeate to the substrate, high-temperature water oxygen content will increase, corrosion speed at a certain temperature.
  • Humidity:

The base plate corrosion at the incision and machining damage is electrochemical corrosion, and low humidity is not easy to form a corrosion battery .

In addition, the large temperature difference will lead to frequent cold and hot deformation of the coating, which will accelerate the aging of the coating loss, and the external corrosion medium is easy to permeate to the substrate.

  • Duration and intensity of sunshine

Sunlight is an electromagnetic wave, which is divided into Y-ray, X-ray, ultraviolet, visible, infrared, microwave and radio waves according to their energy and frequency. Waves and radio waves have low energies and do not interact with matter. Infrared is also a low-energy spectrum that can only stretch or bend the chemical bonds of materials, not break them. Visible light abounds in color.UV ultraviolet spectrum is high-frequency radiation, it is more destructive than low – energy spectrum. As we know, dark spots and skin cancer are caused by the sun’s ultraviolet rays. In the same way, UV can break the chemical bonds of substances, breaking them. It depends on the wavelength of the UV and the bond strength of the material. X-rays are penetrating, breaking chemical bonds, and producing free, charged ions, all of which are deadly to organic matter. Therefore, it can be seen from the above that the duration and intensity of sunshine affect the structural stability of the coating, especially in areas with strong ultraviolet rays.

  • Rainfall and acidity of rainfall

High rainfall acidity is definitely not good for corrosion resistance. However, rainfall has a dual effect. On wall panels and roof panels with large slopes, rainfall has the effect of cleaning the steel plate surface and washing away corrosion products from the surface. However, for low-slope roof panels and areas with poor drainage, the rainfall is large. Easily cause increased corrosion.

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