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.打砂處理:在鍍鋅噴塑處理之前，可以采用打砂處理方法去除橋架表面的氧化膜、銹跡等雜質，增加表面的粗糙度，從而提高鍍鋅噴塑層的附著力。

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.熱浸鋅處理:熱浸鋅是種常見的鍍鋅前處理方法，通過將橋架浸入熔融的鋅液中,使橋架表面附著一層鋅層。熱浸鋅處理可以增加橋架的耐腐蝕性和美觀度,同時提高橋架的使用壽命。

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.鈍化處理:鈍化處理是一種化學處理方法，通過在橋架表面形成一層鈍化膜，可以進一步提高橋架的耐腐蝕性和抗氧化的能力。

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.其他涂層處理:除了噴塑處理，還可以在鍍鋅處理之后進行其他涂層處理，如噴漆噴粉等，以提高橋架的裝飾性和其他性能。

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.

總之,鍍鋅噴塑橋架的表面處理方法可以根據具體需求進行選擇,不同的處理方法會對橋架的性能和外觀產生不同的影響。

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.