Compared with the results of salt spray test, it is found that the probability of grade 3-4 blistering of the color coated plate with poor adhesion aging performance is much higher than that of the color coated plate with good aging performance, which
indicates that the aging performance of the coating with good adhesion aging performance is in direct proportion to the corrosion resistance of the coating, while the color has good adhesion, and the aging performance of the coating is in direct
proportion to the salt spray resistance of the coating surface The CCT (cyclic corrosion test) is better than the color coated plate with poor aging performance.
That is to say, the T-bend performance of the color coated plate is the initial performance of metal corrosion under the coating. At this time, only from the surface, there is no blistering and falling off of the coating, but the decline of T-bend performance
has indicated that the metal corrosion under the coating began to occur. This is because even if the coating has no defects such as uneven internal density, micropores, cracks and gaps, there are still transmission channels for external medium
penetration in the environmental medium. The water molecules on the coating surface can reach the interface of the coating metal matrix through adsorption, diffusion and dissolution until the interface of the coating / metal matrix is destroyed.
The initial macroscopic performance of this kind of interface damage may be the decrease of coating adhesion, which is manifested as the poor aging performance of coating adhesion, and the further macroscopic performance is the foaming and falling
off of coating.
Therefore, combined with the aging test results, the corrosion resistance of the color coated plate can be predicted, which has a good early warning effect on improving the quality of the color coated plate.
Advantages of color coated plate
1) it has the characteristics of light self weight and small structure section, which not only improves the use area rate, but also reduces the setting of foundation. High strength, good safety. It can be used not only as a bearing structure, but also
as an enclosure structure. Generally, there is no beam or column in the house.
2) realize industrialization and production of plant construction. Color steel plate is manufactured and installed in the factory. It is convenient for the factory to plan and standardize production and reduce construction cost. The construction is convenient
and short. The construction of color steel plate is dry structure with high installation degree and guaranteed quality. The device does not need large-scale mechanical equipment, and the construction speed is fast.
3) the data surface is flat and easy to clean. In the manufacturing process of color steel plate, due to the high precision of color steel plate, high flatness of construction surface in the future and tight equipment interface, it can not only meet the
requirements of smooth lubrication, no crack, no particle falling off on the inner and outer surfaces of clean workshop, but also easy to clean, because it is not afraid of water. Excellent decoration. The color steel plate can be decorated without
drilling after all the dry construction is completed. Because of its high flatness and precision, the interface decoration technology is simplified. It doesn't need to brush paint layer and putty for bottoming, and the process is simple, resulting
in decoration cost.