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.打砂处理:在镀锌喷塑处理之前，可以采用打砂处理方法去除桥架表面的氧化膜、锈迹等杂质，增加表面的粗糙度，从而提高镀锌喷塑层的附着力。

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.热浸锌处理:热浸锌是种常见的镀锌前处理方法，通过将桥架浸入熔融的锌液中,使桥架表面附着一层锌层。热浸锌处理可以增加桥架的耐腐蚀性和美观度,同时提高桥架的使用寿命。

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.钝化处理:钝化处理是一种化学处理方法，通过在桥架表面形成一层钝化膜，可以进一步提高桥架的耐腐蚀性和抗氧化的能力。

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.其他涂层处理:除了喷塑处理，还可以在镀锌处理之后进行其他涂层处理，如喷漆喷粉等，以提高桥架的装饰性和其他性能。

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.

总之,镀锌喷塑桥架的表面处理方法可以根据具体需求进行选择,不同的处理方法会对桥架的性能和外观产生不同的影响。

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.