ã€China Aluminum Industry Network】 1. Application of Anti-Atmospheric Corrosion Coatings Outdoor steel structures such as steel structure workshops, steel box girder bridges, TV towers, building antennas, transmission substations, and steel poles are exposed to the atmosphere for a long time. In addition, due to climate change, sun and rain, the surface is rapidly oxidized to form a layer of ferric oxide, which seriously affects the strength and service life of the steel structure. In order to prevent the oxidation of the surface of the steel structure, paint protection is generally used in the past, and its anti-corrosion period is generally 3-5 years, so it requires regular maintenance, maintenance, common method is to copy shovel paint, cost a lot of human and material resources. The surface of the structure is sprayed with zinc and sprayed with aluminum to protect it. The anti-corrosion period can be up to 30 years without maintenance. If the paint is sealed with zinc-aluminum coating, the anti-corrosion period will be longer.
The surface of the steel structure can only play an anodic protection after only spraying zinc and aluminum, thus achieving the purpose of long-term corrosion protection of steel structures. Therefore, many major projects and municipal projects in the country have been designated to adopt this technology. Such as: Longer Three Gorges Gate of the Yangtze River, Shanghai Oriental Pearl TV Tower, Main Guard Bar of Yangpu Bridge, Overhead Steel Girders in Guangzhou City, Steel Structure Aerials of Shanghai (Shanghai-related Windows and Doors Information) Securities Building, Gonggou Gas Pipeline in Pudong Airport Road, Shanghai South Bridge 500,000 kilowatts of substations, etc., to ensure major projects for a hundred years.
Second, water-resisting corrosion-resistant coating Steel-made water gate is the main steel structure of the hydropower station and reservoir to control the amount of water. It is partially submerged in water for a long time, and the surface is subject to microbial attack (such as the adsorption of nail rake, and its excrement is acidic). Part of the long-term exposure to the atmosphere, especially in the waterline, is affected by surfing and floating objects on the surface of the water. At the same time, it is affected by high tides and low tides. This part of the surface of the steel structure often alternates between wet and dry, making it particularly susceptible to rust. The use of zinc wire spraying and aluminum spraying has greatly improved the corrosion resistance of steel gates, which is 5 to 6 times longer than the original paint (paint-related windows and doors).
Third, spray zinc, aluminum spray process and similar process performance comparison (hot dip galvanizing process)
1, hot dip galvanizing process pretreatment using pickling, phosphating process, the workpiece surface will have acid, lye residue, leaving the hidden danger of corrosion, so that the hot dip galvanized layer is easy to produce fall off. Spray zinc, aluminum spray process Pretreatment adopts sandblasting technology, so the surface of the workpiece is very clean and rough, and the surface is sprayed with zinc and no corrosion from inside to outside will occur after aluminum spraying, so that the zinc layer will not fall off.
2, hot dip galvanizing process has a certain temperature, about 440 °C, so the workpiece will be deformed after hot-dip; and spray zinc, aluminum spraying process is very low temperature, the workpiece surface temperature <80 °C, so the workpiece is not deformed .
3, the use of hot-dip galvanizing process, the workpiece by the plating tank length × width × height restrictions; while the use of zinc spray, aluminum spray process without restrictions on the workpiece.
4, the use of hot-dip galvanizing process, there are still on-site repair problems. On-site installation of welds, loading and unloading, transportation damage, repair can only use paint (paint related windows and doors information), resulting in a breakthrough process. Such as the use of zinc spray, In the aluminum spraying process, the site can be repaired by spraying zinc or aluminum spray to avoid breakthroughs in the process.
5. As the pretreatment of the hot-dip galvanizing process adopts pickling and phosphating, the surface of the workpiece has no roughness, and the coating adhesion is poor. The pretreatment of the zinc spray and aluminum spray process adopts sand blasting, Sa ≥ 2.5 grade. Therefore, the workpiece surface roughness, coating adhesion is better. Tensile strength ≥ 0.6kg/mm2.
6, hot-dip galvanizing process is very serious pollution of water quality, environmental protection issues are very prominent. So thermal spray zinc, aluminum spray process in more and more widely.
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