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Color steel plate is one of the most popular emerging materials. With the progress of science and technology, the enhancement of environmental awareness, and the improvement of people's living standards, color steel plate is widely used. Whether it is to build a simple house or use a movable plank house, it is very common to use color tiles on the roof of the house, which is not only cheap, but also easy to manufacture. The color steel plate is easy to corrode if it is not treated in time, which will affect the use of color steel plate. Next, Jinan color steel plate manufacturers will give you a detailed introduction.
Method one: hot dip zinc treatment.
Hot dip galvanizing is to immerse the derusted steel member into the molten zinc solution at 600 ℃ to make the surface of color steel plate adhere to zinc layer. The thickness of zinc layer shall not be less than 65 μ m for thin plate less than 5mm and 86 μ m for thick plate, so as to achieve the purpose of anti-corrosion. The advantages of this method are long service life, high degree of industrialization and stable quality. Therefore, it is widely used in outdoor color steel plate which is seriously corroded by atmosphere and is not easy to maintain. Such as a large number of transmission towers, communication towers, etc. In recent years, hot dip galvanizing is widely used in profiled steel sheet of light steel structure system. The first process of hot dip galvanizing is pickling and derusting, and then cleaning. If these two processes are not handled properly, it will leave hidden danger for corrosion prevention. For the designers of Jinan color steel plate structure, it is necessary to avoid the design of components with joint surface, so as to avoid acid pickling or acid solution cleaning in the joints. The phenomenon of yellow water flowing on the surface of galvanized steel is caused. Hot dip galvanizing is carried out at high temperature. For tubular members, both ends should be open. If both ends are closed, the air in the pipe will expand and the head plate will burst, which will cause the safety accident to be blocked and easy to accumulate in the pipe.
Method two: thermal spraying aluminum (zinc) composite coating.
This is a long-term anti-corrosion method equivalent to hot-dip galvanizing. The specific method is to remove rust on the surface of Jinan color steel plate by sand blasting to expose metal luster and roughen the surface. Then the aluminum (zinc) wire continuously sent out is melted by acetylene oxygen flame, and then blown onto the surface of color steel plate with compressed air to form a honeycomb aluminum (zinc) spraying layer (thickness of about 80 μ M-100 μ m). Then, the pores are filled with epoxy resin or neoprene paint to form a composite coating. This method can not be used in the inner wall of the tubular member, so the two ends of the tubular component are sealed to prevent the inner wall from corrosion. The advantage of this process is that it has strong adaptability to the size of components, and the shape and size of components are almost unlimited. Another advantage is that the heat effect of this process is local and constrained, so it will not produce thermal deformation. Compared with hot-dip galvanizing, the industrialization degree of this method is lower, and the labor intensity of sand blasting aluminum (zinc) spraying is affected.
Method 3: coating method.
Coating method is not generally used as a long-term anti-corrosion method, so it is used for indoor color steel plate or outdoor color steel plate which is relatively easy to maintain. It has a low cost at one time, but it has a higher maintenance cost when used outdoors. During the construction of coating method, rust should be removed first, and the coating depends on rust removal. Therefore, the coating with high requirements is usually derusted by sandblasting and shot peening to expose the luster of metal and remove all rust and oil stains. The coating applied on site can be derusted by hand. The selection of coating should consider the surrounding environment. Different coatings have different resistance to different corrosion conditions. The coating is generally divided into primer (layer) and topcoat (layer). The primer contains more powder and less base material. The film is rough, has strong adhesion with steel and good adhesion with topcoat. The top coat has more base materials, glossy film, which can protect the primer from atmospheric corrosion and weathering. The compatibility of different coatings should be paid attention to when choosing different coatings. Proper temperature (5 ~ 38 ℃) and humidity (relative humidity no more than 85%) should be adopted for coating construction. The construction environment of coating should be less dust and there should be no condensation on the surface of components. No rain within 4 hours after painting. Coating is usually done 4 ~ 5 times. The total thickness of dry paint film is 150 μ m for outdoor engineering and 125 μ m for indoor engineering, and the allowable deviation is 25 μ M. The total thickness of dry paint film can be increased to 200 ~ 220 μ m on the sea or in the strong corrosive atmosphere.
The above is today's sharing of Jinan color steel corrosion treatment steps related content, hope to help you, want to learn more can contact us by phone or pay attention to our website.