Thread Content
The long-term anti-corrosion technology of arc spraying has been widely used in China since the 1990s, providing long-term anti-corrosion protection in various key engineering fields such as bridges, water resources projects, ports, power generation, and coal mines. This technology forms a composite anti-corrosion system by applying zinc, aluminum, or their alloy coatings via arc spraying, in combination with an organic sealing coating, offering significant advantages such as an anti-corrosion lifespan of over 50 years and no maintenance required for 30 years. Its coating has a strong bond with the substrate, and even in the event of local damage, it can continue to protect the steel substrate through cathodic protection, making it highly suitable for the long-term protection of large-scale steel structures. In China, this technology has been successfully applied in various **key projects: The Three Gorges Water Control Project – arc spraying technology was used to protect the critical hydraulic steel structures from corrosion, ensuring their long-term safe operation. Wuhan Junshan Yangtze River Bridge: The steel box girders and bridge deck are treated with arc spraying for long-term corrosion protection, enabling effective resistance to corrosion in complex environments. Steel piles at Majishan Port Terminal of Baoshan Iron and Steel Group: achieve long-term corrosion resistance in harsh marine environments, reducing maintenance costs. Bridges such as the Nanpu Bridge over Qiandao Lake in Chun’an and the Sanyuanli Overpass at Guangzhou Airport have also adopted this technology, achieving excellent protection results. In the coal mining sector: China University of Mining and Technology has applied arc spraying for corrosion protection to the steel shaft frames of various coal mines in Yanzhou, Pingdingshan, and other locations; it became the first company in China to obtain ISO9002 certification for thermal spraying-based corrosion protection services. Furthermore, **relevant standards have been established to regulate its use. For example, the \"Technical Specifications for Corrosion-Resistant Coating Application by High-Speed Arc Spraying on Steel Structures Used in Marine Environments\" (GB/T 37309-2019) specifies the minimum thickness requirements for zinc-aluminum and rare-earth alloy coatings in various environments such as marine atmospheric areas and areas exposed to splashing waves, thereby ensuring construction quality and long-term performance.