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Guardians in the Wind and Rain: Evolution of Anti-corrosion Technology for Special Fasteners in Coastal Engineering

The salt spray environment in coastal areas poses a severe challenge to the corrosion resistance of screws. From the traditional galvanizing process to the current Dacromet coating and then to the new nano-composite coating, anti-corrosion technology has been constantly upgraded. This article will take the bolt protection of cross-sea Bridges as an example to explore how to extend the service life of fasteners and ensure the durability of the project through surface treatment.

The bolt protection scheme of a certain cross-sea bridge adopts the nano-composite coating technology. Compared with traditional galvanizing, this technology has increased the salt spray resistance time from 500 hours to over 3,000 hours. The nanoparticles in the coating can effectively prevent the penetration of chloride ions while maintaining the mechanical properties of the bolts. In addition, the bridge is equipped with an intelligent monitoring system that can detect the corrosion status of bolts in real time and issue timely warnings for replacement. This dual protection of "materials + intelligence" provides a long-term guarantee for coastal projects.