What are the significant advantages of hot dip galvanized bridge's anti-corrosion performance?
Publish Time: 2025-01-28
As an ancient and effective anti-corrosion technology, hot dip galvanizing has been tested for more than a hundred years since it was first used in industrial products in 1836. In the field of bridge anti-corrosion, hot dip galvanized bridge has demonstrated its unique anti-corrosion performance advantages, which are particularly significant compared with other anti-corrosion technologies such as spray painting and electroplating.
First, the anti-corrosion layer of hot dip galvanized bridge is thicker and tightly bonded. During the hot dip galvanizing process, the steel is dipped in molten zinc liquid to form a dense zinc-iron alloy layer. This alloy layer is not only uniform in thickness, but also tightly bonded to the steel matrix and is not easy to peel off. In contrast, the spray paint anti-corrosion layer is thinner and is easily eroded by the external environment such as ultraviolet rays and rain, resulting in a gradual decrease in anti-corrosion performance. Although electroplating can also form a metal coating, its coating thickness and bonding strength are often not as good as hot dip galvanizing.
Secondly, the anti-corrosion performance of hot dip galvanized bridge is long-lasting and stable. The hot-dip galvanized layer can form a dense zinc oxide film in the air, which can effectively block the erosion of corrosive substances such as oxygen and moisture, thereby extending the service life of the bridge. In suburban environments, most hot dip galvanized bridges can be maintained for more than 50 years without repair, and their corrosion resistance is very strong. The spray paint anti-corrosion layer is prone to aging and cracking, and requires regular maintenance and recoating. Although the electroplating layer also has certain anti-corrosion properties, problems such as coating shedding and discoloration may occur during long-term use.
In addition, the anti-corrosion performance of the hot dip galvanized bridge is also reflected in its comprehensive protection. Since the zinc liquid can penetrate into the depressions, sharp corners and hidden places of the steel during the hot-dip galvanizing process, it can achieve comprehensive protection of the steel. However, anti-corrosion technologies such as spray painting and electroplating often find it difficult to achieve such an effect, and are prone to leaving anti-corrosion dead corners.
In summary, the hot dip galvanized bridge has significant advantages in anti-corrosion performance. Its thick anti-corrosion layer, long-lasting and stable anti-corrosion performance and comprehensive protection ability make hot dip galvanized bridge irreplaceable in the field of bridge anti-corrosion. With the advancement of science and technology and the continuous improvement of technology, the anti-corrosion performance of hot dip galvanized bridge will be even better, providing a more solid guarantee for the safety and durability of bridges.
