The surface treatment methods of galvanized spray plastic bridge mainly include galvanizing and spray plastic treatment. In addition to these two main methods, there are also other auxiliary surface treatment methods, including sanding, hot dip galvanizing, passivation, etc. These methods can be carried out before or after galvanizing and spraying treatment to further improve the corrosion resistance and other performance of the bridge.
1. Sanding treatment: Before the galvanizing and spraying treatment, the sanding treatment method can be used to remove impurities such as oxide film and rust on the surface of the bridge, increase the surface roughness, and thereby improve the adhesion of the galvanizing and spraying layer.
2. Hot dip galvanizing treatment: Hot dip galvanizing is a common pre-treatment method for galvanizing, which involves immersing the bridge in molten zinc solution to attach a zinc layer to the surface of the bridge. Hot dip galvanizing treatment can increase the corrosion resistance and aesthetics of the bridge, while also improving the service life of the bridge.
3. Passivation treatment: Passivation treatment is a chemical treatment method that forms a passivation film on the surface of the bridge, which can further improve the corrosion resistance and oxidation resistance of the bridge.
4. Other coating treatments: In addition to plastic spraying treatment, other coating treatments can also be carried out after galvanizing treatment, such as spray painting and powder spraying, to improve the decoration and other performance of the bridge.
In summary, the surface treatment method of galvanized spray plastic bridge can be selected according to specific needs, and different treatment methods will have different effects on the performance and appearance of the bridge.