How to prevent color steel coils from aging

August 31, 2023
Latest company news about How to prevent color steel coils from aging

Color steel coils may age if used for too long or if they are not used for a long time. Long-term construction or storage will inevitably be exposed to sunlight. Aging will occur after long-term direct exposure to light, which is something we cannot prevent, but we can usually prevent and slow down the aging speed in advance, so what should we do?
The first prerequisite for the aging or photochemical reaction of color steel coils is that the surface components of the color steel coils can digest and absorb radiation; secondly, when the radiation energy absorbed by the molecular structure exceeds the bond energy of the molecular structure, the coating of the color steel coils can dissolve. Because the shorter the wavelength of the light source, the more kinetic energy it contains.

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According to this basic theory, the embrittlement of color steel coils caused by air pollution is caused by the molecular structure of the coating absorbing the kinetic energy of the ultraviolet band in natural light that is higher than the bond energy of its molecular structure, causing the molecular structure of the coating to dissolve. As the polyurethane coating ages, the base material itself gradually disappears, and the coating surface gradually becomes matte and loses its luster. This lack of base material ultimately leaves a relatively stable paste object, which remains on the surface of the polyurethane coating in the form of unbound powder. This process is called delamination.
Generally speaking, there are big differences in the anti-aging properties of polyester color steel coils with different coating thicknesses. The anti-aging properties of thin-coated color steel coils are weak, while the anti-aging properties of normal thin-thick coatings are relatively good.