Railway steel bridge anti-corrosion coating

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1. Painting of Nanjing Yangtze River Bridge

The current paint coating system used on the Nanjing Yangtze River Bridge is the first system listed in Table 2, which consists of two layers of red phenolic primer and three layers of iron-alkyd topcoat. This system typically requires maintenance every 7 to 8 years, usually involving the application of an additional topcoat to maintain its protective function.

2. Painting of Wuhu Yangtze River Bridge

Completed in 1998, the Wuhu Yangtze River Bridge uses the fifth coating system from Table 2, which includes two layers of epoxy zinc-rich primer, one layer of iron-epoxy intermediate coat, and two layers of gray aluminum powder alkyd topcoat. With this system, maintenance is generally needed every 12 to 15 years to ensure long-term protection against corrosion.

3. Anti-Corrosion Coating for Steel Beams of Wanzhou Yangtze River Bridge

As a key project of the Wanzhou-Changjiang Railway, the Wanzhou Yangtze River Bridge is located in Chongqing's Wanzhou area, where environmental conditions are particularly corrosive. The bridge is currently under construction, and the selected coating system includes two layers of epoxy zinc-rich primer, one layer of iron-epoxy intermediate coat, and two layers of fluorocarbon topcoat. This advanced system is expected to provide a service life of over 30 years, ensuring durability in harsh environments.

These examples highlight how different regions and environmental conditions influence the choice of paint systems. Each bridge is designed with specific coatings that match local weather patterns and corrosion risks, ensuring structural integrity and longevity. Understanding these systems helps engineers and maintenance teams plan more effectively for future repairs and upgrades.

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