Steel structure workshops, steel box girder bridges, TV towers, building antennas, transmission and substations, steel light poles and other outdoor steel structures. These steel components are exposed to the atmosphere for a long time, and are exposed to climate change, sun and rain, and the surface is rapidly oxidized. A layer of iron trioxide is formed, which seriously affects the strength and service life of the steel structure. In order to prevent oxidation of the steel structure surface, paint protection was generally used in the past, and its anti-corrosion period is generally 3-5 years, so frequent repairs and maintenance are required. The common method is to scrape the paint, which consumes a lot of manpower and material resources. Now the steel structure surface is protected by zinc and
aluminum spraying process, and the anti-corrosion life can reach more than 30 years without maintenance. If paint is added to the zinc-aluminum coating to seal, the anti-corrosion life will be longer. The surface of steel structure can only be protected by anodic protection after being sprayed with zinc and aluminum, so as to achieve the purpose of long-term corrosion protection of steel structure. Therefore, many major national engineering and municipal projects have been designated to adopt this process. Such as: the permanent gate of the Three Gorges of the Yangtze River, the Shanghai Oriental Pearl TV Tower, the main protection pole of Yangpu Bridge, the elevated steel beams of the Guangzhou inner ring, the steel structure antenna of Shanghai Securities Building, the common ditch gas explosion pipeline on Pudong Airport Road, the 500,000 kilowatt substation of Shanghai South Bridge, etc. And so on to ensure a century-old plan for major projects. 1. Anti-corrosion coating The steel gate is the main steel structure for controlling water flow in hydroelectric power stations and reservoirs. Part of it is immersed in water for a long time, and the surface is corroded by microorganisms (such as the adsorption of nail scorpion, its excrement is acidic). The other part is exposed to the atmosphere for a long time, especially the waterline part, which is impacted by surfing and floating objects on the water surface. At the same time, it is affected by the high tide and low tide, so that the surface of this part of the steel structure often alternates between dry and wet, and it is particularly prone to rust. Now the wire spraying zinc and aluminum spraying process has greatly improved the corrosion resistance of the steel gate, and the anti-corrosion life of the original paint process has been increased by 5 to 6 times. 2. Performance comparison between zinc spraying and aluminum spraying process and similar processes (hot-dip galvanizing process) 1. The hot-dip galvanizing process adopts pickling and phosphating processes, and there will be acid and lye residues on the surface of the workpiece, leaving behind The hidden danger of corrosion makes the hot-dip galvanized layer easy to peel off. Zinc spraying and aluminum spraying process pretreatment adopts sandblasting process, so the surface of the workpiece is very clean and rough. After the surface is sprayed with zinc and aluminum, there will be no corrosion from the inside to the outside, so that the zinc layer will not fall off. 2. The hot-dip galvanizing process has a certain temperature, about 440℃, so the workpiece will be deformed after hot-dip; while the temperature of the zinc spraying and aluminum spraying process during spraying is very low, the surface temperature of the workpiece is less than 80℃, so the workpiece will not be deformed . 3. Using hot-dip galvanizing process, the workpiece is limited by the length of the plating tank × width × height; while the use of zinc and aluminum spray process, there is no restriction on the workpiece. 4. Hot-dip galvanizing is used, and there are still problems with on-site repair. For the damage in the welding seam, loading and unloading and transportation process during on-site installation, only paint can be used for repairing, which creates a technological breakthrough. If zinc spraying or aluminum spraying is used, the method of zinc spraying or aluminum spraying can be used for repairing on site to avoid technological breakthroughs. 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 bonding force is poor. The pretreatment of zinc spraying and aluminum spraying is sandblasting, with Sa≥2.5, so the surface of the workpiece has roughness and the coating adhesion is better. Tensile strength ≥ 0.6kg/mm2. 6. u200bu200bThe hot-dip galvanizing process has serious water pollution, and the environmental protection problem is very prominent. Therefore, thermal spraying zinc and aluminum spraying processes are becoming more and more widespread. ————The article comes from the Internet. If there is any infringement, please contact to delete it.
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