The hot-dip galvanized bridge has a thick and dense pure zinc layer covering the surface of steel, which can avoid contact between the steel substrate and any corrosive solution, protecting the steel substrate of the hot-dip galvanized bridge from corrosion. In the general atmosphere, a thin and dense layer of zinc oxide is formed on the surface of the zinc layer, which is difficult to dissolve in water and therefore plays a protective role on the steel substrate. If zinc oxide forms insoluble zinc salts with other components in the atmosphere, its anti-corrosion effect is more ideal.
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