In the color plate industry, we often encounter some interesting questions: how long is the salt spray test 800 hours equivalent to outdoor corrosion resistance? Quv-a experiment for 1000 hours, equivalent to how long is the outdoor weather resistance? Why can fluorocarbon coatings be guaranteed for 20-25 years? What is the basis? What experiment can 100% imitate the outdoor state

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Strictly speaking, no experimental instrument in the laboratory can imitate the complex outdoor conditions. The corrosion of steel plate or the aging of paint film are all changes under the combined action of outdoor light, temperature, corrosive substances, temperature difference and other changing conditions. However, the instruments in the laboratory can only imitate one or two of these conditions and can not simulate the changes in reality. They can only rely on strengthening the strictness of one aspect to see the resistance of paint film of color plate So far, no one can tell you for sure that the length of laboratory testing can be equivalent to the length of outdoor testing Laboratory testing is just a simple simulation, which distinguishes the differences between different products by comparison

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However, the commonness of these exposure sites is that the selected dimensions are basically 25 ± 5 degrees north latitude, belonging to the subtropical monsoon humid climate area, with sufficient rainfall and strong light For the north of China, the rainfall is low, the illumination is weak, the atmospheric corrosion is heavy, and the natural environmental conditions are obviously inconsistent Therefore, Huijin color steel Co., Ltd. has established its own exposure site (36 degrees north latitude) in consideration of the regional situation of its own customer group, and obtained the first-hand experimental data of color steel plate by using the international standard test method as the basis for recommending different types of products to different customer groups with different requirements

In the color plate industry, the world's most recognized, the only detection of paint film to resist aging, corrosion detection for long, is outdoor exposure. Therefore, various countries have established exposure sites in line with their national conditions, such as Florida exposure site in the United States, Okinawa exposure site in Japan, allunga in Australia, Hainan exposure site in China and so on Before launching new coating products, major international companies will basically have experimental data for at least five years or even longer in such exposure sites Their flagship products have exposure test data for more than 20 years