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With the rapid development of high-speed and electrified railways, the maintenance and repair standards for steel bridges have significantly increased. Traditional construction methods on bridges are no longer feasible, which has led to a growing demand for coatings that offer superior corrosion resistance and extended service life. The current system typically applies one or two layers of protective coating throughout the bridge's lifespan, but there is an urgent need to develop water-based and environmentally friendly paints that reduce environmental impact.
High-performance coatings have become essential in modern bridge protection. For instance, room-temperature curing fluorocarbon coatings demonstrate excellent weather resistance, salt spray resistance, chemical resistance, and stain and erosion resistance. Although these coatings are widely used, domestic fluorocarbon products still lag behind foreign counterparts in key performance areas. Therefore, further research and development—especially in fluorocarbon resins—are necessary to produce high-quality, true fluorocarbon coatings that meet global standards.
Water-based paints are increasingly popular due to rising environmental awareness and stricter regulations. In China, water-based inorganic zinc-rich primers are already commonly used in steel structure processing. They are also applied as matching primers on steel bridges, but challenges remain, such as brittle coatings and poor compatibility with other materials. Ongoing improvements and studies are needed to optimize their performance and application techniques.
Composite protection materials, such as metal spraying followed by topcoating, have been used for over 90 years. Since the 1930s, countries abroad have extensively used zinc and aluminum coatings to protect bridges, hydraulic structures, and industrial equipment. In China, this technique has been in use since the 1950s. Modern advancements include the ability to spray various alloys like aluminum-magnesium and rare-earth aluminum, along with the evolution from flame spraying to high-speed arc spraying. These technologies have been successfully implemented in projects like the Yuehai Trestle Bridge, proving their long-term effectiveness against corrosion.
Protective materials for railway reinforced concrete bridges are also crucial. With a design life of 100 years, similar to steel bridges, many existing concrete structures suffer from corrosion and damage. To address this, it's vital to develop advanced protective coatings and corresponding construction methods that ensure durability and safety. This includes both surface treatments and internal reinforcement strategies to extend the lifespan of critical infrastructure.
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