Zinc-Nickel Diffusion Coating Metal Anti-Corrosion Technology Project

Release date:

2016/06/21

　　The “Zinc-Nickel Diffusion Coating Metal Anti-Corrosion Technology,” independently developed by the company, has been adopted in large quantities for major national projects—including Chongqing Light Rail, Guangzhou, Shenzhen, Chongqing, and Chengdu Metro systems, the Guangzhou–Wuhan High-Speed Railway, and the Yuzhou-Suining Double-Track Railway—thanks to its unique superior performance in high corrosion resistance, high hardness, and excellent wear resistance, as well as its environmentally friendly, energy-saving, zinc-efficient, and cost-effective process advantages. At the 5th Urban Rail Transit Sustainable Development Forum held in Beijing in 2009, this technology attracted attention from relevant experts and was hailed as a significant breakthrough in anti-corrosion technology for metallic components used in rail transit. It is recommended that this technology be promoted nationwide.
 
　　Urban rail transit metal components are exposed outdoors for long periods, enduring not only the effects of sun and rain but also the corrosive attack of urban acid rain and acid mist or marine salt spray. Moreover, the humid underground environment of subway systems poses a significant corrosion threat to subway metal components and their associated equipment. Thus, how to effectively prevent metal component corrosion over the long term has consistently been one of the major challenges hindering the sustained development of urban rail transit.
 
　　Chongqing Dayou Surface Technology Co., Ltd., in collaboration with the Rail Beam Bridge Research Center of Chongqing Rail Transit Corporation, has developed a new heavy-duty anti-corrosion surface treatment technology—“Zinc-Nickel Diffusion Coating Technology”—specifically designed for metal components used in rail transit systems. This technology produces no three-waste emissions, resists corrosion from acid rain, and withstands salt-spray tests for over 600 hours and sulfur dioxide tests for over 168 hours, ensuring that metal components remain free from corrosion for up to 20 years. It also boasts excellent wear resistance and impact resistance, with a surface hardness reaching 300–400 HV.
 
　　This technology has been successfully applied to the anti-corrosion renovation project of the finger-plate system on the zoo section of Chongqing Light Rail Line 2. After undergoing a 26-month trial period, no new rust spots have appeared. The Chongqing Rail Transit Corporation has now fully adopted this technology in the finger-plate systems of Chongqing Light Rail Line 3 and in the track fasteners of Metro Line 1, effectively addressing the longstanding challenge of corrosion protection for metal components in urban rail transit systems.

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Rust-Resistant Categories and Their Characteristics

Development of Anti-corrosion Coatings

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Rust-Resistant Categories and Their Characteristics

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Development of Anti-corrosion Coatings