Thread Content
Thermal spraying long-term anti-corrosion technology has been successfully applied to many major bridge projects at home and abroad. This technology provides cathodic protection and physical barriers for steel structures through thermal spraying zinc, aluminum or their alloy coatings, significantly extending the service life of bridges. Domestic Typical Application Case Wuhan Junshan Yangtze River Bridge: The steel box girder of the main bridge uses arc spray zinc coating for anti-corrosion. It has remained in good condition after many years of operation. It is one of the early successful examples of the application of this technology on large domestic bridges. Yangtze River Three Gorges Water Conservancy Project: Some steel structure components use arc spraying for long-term anti-corrosion, which can effectively cope with high humidity and highly corrosive environments and ensure the safe operation of key structures. Shanghai maglev express train track functional parts: The track support structure uses thermal spray aluminum coating, which has excellent weather resistance and corrosion resistance, ensuring structural stability in high-speed operating environments. Urban and high-speed bridges such as the Guangzhou Airport Sanyuanli Overpass and Xulian Expressway Pizhou Canal Bridge also use arc spraying technology for steel structure protection, and the anti-corrosion effect is remarkable. Mature application abroad and practice of the Fourth Highway Bridge in Queensferry, UK: It consumes 20,000 tons of steel and 1 million pounds of zinc wire for spraying. It has been in use for more than 20 years without maintenance and has excellent anti-corrosion effects. George Street Bridge, Newport, South Wales: Built in 1964, it was located in a highly industrially polluted area. It was sprayed with zinc to prevent corrosion. When inspected in 1985, the coating was still in good condition, and it was confirmed that it could last for at least 25 years without maintenance. Fourth Road Bridge, Sallingsferry, Scotland: The main span is 1,000 meters and is located in a windy marine environment. It is sprayed with zinc and sealed. The protective layer is still intact after 13 years of no maintenance. In Europe, tens of millions of pounds of zinc wire were used for thermal spraying of bridges every year in the 1960s and 1970s. It was widely used in large steel structure bridges, verifying its long-term reliability under complex climate conditions. These engineering examples show that thermal spraying long-term anti-corrosion is not only suitable for new bridges, but also for the repair and strengthening of existing structures. It has outstanding advantages especially in harsh environments where frequent maintenance is difficult.