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First, the principle of aluminum spray zinc anti-corrosion of steel structure
The principle of arc spray corrosion protection is the use of arc spray equipment, two charged wire (e.g. zinc, aluminum, etc.) for heating, melting, atomization, spraying to form an anti-corrosion coating, plus organic closed coating of long-lasting anti-corrosion composite coating, the coating is characterized by:
has a more Long corrosion-resistant life can reach more than 50 years, while the anti-corrosion coating in 30 years of use without any other anti-corrosion maintenance;
Arc spray coating and metal substate with excellent coating binding force (up to 10Mp or more), metal spray coating with mechanical mosaic and micrometals and substation metal combination, in a slight bend, impact or collision can also ensure that the anti-corrosion coating does not fall off, skin, binding solid, anti-corrosion long-term effective, which is no other surface corrosion coating can not be achieved
China
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steel structure spray aluminum spray zinc anti-corrosion coating principle is cathode protection
, in the corrosion environment, even if the corrosion-resistant coating local damage, still has the effect of sacrificing themselves to protect the steel substate. The area ratio of the coating (anode) to the steel substation (cathode) is ≥1, while the anode and cathode ratio of the zinc-rich coating is <1, and its protective effect and binding force are much lower than that of the arc spray corrosion protection coating.
II, steel structure spray aluminum spray zinc anti-corrosion technology advantages
arc spraying compared with flame spraying, due to the use of electrical energy instead of gas combustion, greatly improved work efficiency and work safety, especially the emergence of arc spraying mechanized equipment, arc spraying technology has been able to fully meet the needs of bridge construction duration, and arc temperature is much higher than the flame, coating binding force is much greater than flame spraying, so the coating quality can also meet the long-lasting anti-corrosion needs. Because of the high cost of labor in the United States, the cost of using arc spray anti-corrosion construction is even lower than that of heavy anti-corrosion paint. After decades of testing, spraying technology has proved to be the best way to prevent long-lasting corrosion in steel structures, a conclusion that has been recognized by government departments and engineering communities in many countries around the world.
3. The construction process of aluminum spray zinc and anti-corrosion in steel structure
the general arc spraying equipment consists of rectifier power supply, control device, spray gun, wire frame or wire feed device, compressed air supply system, etc. Wire shelves and compressed air supply systems are the same as wire flame spray. In addition to the arc spray zinc and aluminum spray process parameters have a lot to do with the spray material, but also depends on the equipment used and the requirements of production efficiency.
steel structure spray aluminum spray zinc anti-in china's application of arc spraying long-lasting anti-corrosion technology in the 1990s, metal spraying technology, especially arc spraying application is the most common, its application prospects are more extensive.
I. The application of steel structure spray aluminum spray zinc anti-corrosion
has been widely used in coal mines, railways, water conservancy, port terminals, metallurgy, machinery, radio and television, medical treatment, electricity, fire protection and other fields, such as Baoshan Iron and Steel Group Mashan Port Terminal steel piles, Shanghai magnetic levitation express train track functions, the Yangtze River Three Gorges water conservancy hub project, Wuhan Military National key construction projects such as steel box beams and bridge surfaces of the Yangtze River Bridge, as well as steel-framed bridges such as the Hunan Pu Bridge, the Yangtze River Huangbai River Bridge, the Lower Jail Creek Bridge, the Three-Yuan Li overpass at Guangzhou Airport, and the Luzhou Canal Bridge of the Xulian Expressway, have adopted long-lasting corrosion protection technology of arc spraying, and achieved good anti-corrosion effect.
China has been fully capable of using arc spraying long-lasting anti-corrosion technology to solve the country's large-scale steel bridge corrosion protection problems.The heavy anti-corrosion technology of
bridge steel structure has gradually formed two major development trends, one is the rapid development of a heavy anti-corrosion system with inorganic zinc-rich coating as the base, and the other is the more mature heavy anti-corrosion system with metal spray coating as the base, which is concerned by various types of steel structure bridge corrosion prevention because of its excellent corrosion resistance and environmental adaptability. In the next few decades, the country will save a lot of steel bridge anti-corrosion maintenance costs, reduce environmental pollution, extend the service life of steel bridge, produce huge economic and social benefits.