First, the principle of steel structure aluminum spray zinc anticorrosion Steel structure aluminum spray zinc anticorrosion technology, especially arc spraying is widely used, and its application prospects are more extensive. The principle of arc spraying anticorrosion is to use arc spraying equipment to heat, melt, atomize and spray two charged metal wires (such as zinc, aluminum, etc.) to form an anticorrosive coating, plus a long-term anticorrosive composite coating of organic closed coating. The significant characteristics of the coating are: It has a long corrosion resistance life and its corrosion resistance life can reach more than 50 years. At the same time, the anti-corrosion coating does not need any other anti-corrosion maintenance during the 30-year service period; For maintenance after 30 years, only the sealing coating must be brushed on the arc spraying layer; No need to re-spray, to achieve a corrosion prevention, coating long-lasting effective. The arc spraying layer and the metal substrate have excellent coating bonding force (up to 10Mp or more), and the metal spraying layer is combined with the base metal by mechanical inlay and micro-metallurgy, which can also ensure that the anti-corrosion coating does not fall off, does not peel, and is firmly combined and effective for a long time under slight bending, impact or collision, which is not achieved by any other surface anti-corrosion coating. The principle of aluminum and zinc spraying anticorrosive coating on steel structure is cathodic protection. In corrosive environment, even if the anticorrosive coating is locally damaged, it still has the effect of sacrificing itself to protect the steel matrix. Area ratio of coating (anode) to steel substrate (cathode) ≥1; The ratio of anode to cathode of zinc-rich coating is less than 1, and its protective effect and binding force are much lower than that of arc spraying anticorrosive coating. Compared with flame spraying, arc spraying, due to the use of electric energy instead of gas combustion, greatly improved work efficiency and safety, especially the emergence of arc spraying mechanized equipment, arc spraying technology can fully meet the needs of bridge construction period, and the arc temperature is much higher than the flame. The binding force of the coating is also much higher than that of the flame spraying, so the coating quality can fully meet the needs of long-term anticorrosion. Due to high labor costs in the United States, the cost of using arc spraying anti-corrosion construction is even lower than that of heavy anti-corrosion paint. After decades of testing, it has been proved that spraying technology is a long-term anticorrosion method for steel structures, and this conclusion has been recognized by government departments and engineering circles in many countries in the world. General arc spraying equipment is composed of rectifier power supply, control device, spray gun, wire tray frame or wire feeding device, compressed air supply system, etc. The wire tray and compressed air supply system are the same as wire flame spraying. Arc spraying zinc, spraying aluminum process parameters in addition to the spraying material has a great relationship, but also depends on the use of equipment and production efficiency requirements. The long-term anticorrosion technology of arc spraying has been widely used in metal spraying technology since the 1990s, especially arc spraying, and its application prospect is also wide. Fourth, the application of aluminum and zinc spraying anticorrosive steel structure has been widely used in coal mine, railway, water conservancy, port, metallurgy, machinery, radio and television, medical, electric power, fire protection and other fields. Such as Baoshan Iron and Steel Group Majishan Port wharf steel pile, Shanghai Maglev fast train track function parts, the Yangtze River Three Gorges project, Wuhan Junshan Yangtze River Bridge steel box girder and bridge deck and other national key construction projects and Chun 'an Qiandao Lake Nanpu Bridge, Yangtze River Huangbai River bridge, Xiaoliaoxi bridge, Guangzhou Airport Sanyuanli overpass, Xulian highway, Hou Zhou Canal bridge and other steel structure Bridges Arc spraying long-term anticorrosion technology has been adopted for corrosion protection, and good anticorrosion effect has been achieved. China has been able to use arc spraying long-acting anti-corrosion technology to solve the corrosion protection problem of national large steel Bridges. The heavy anticorrosion technology of bridge steel structure has gradually formed two major development trends, one is the rapidly developing heavy anticorrosion system based on inorganic zinc-rich coating, and the other is the more mature heavy anticorrosion system based on metal spraying layer. These two systems have received the attention of various types of steel structure bridge anticorrosion due to their excellent anticorrosion performance and environmental adaptability. In the next few decades, it will save a lot of steel bridge anti-corrosion maintenance costs for the country, reduce environmental pollution, extend the service life of steel Bridges, and produce huge economic and social benefits.
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