Mainly related to: electrochemical-galvanic cell principle, electrochemical-sacrificial anode cathodic protection.
Zinc is more active than iron. When zinc and iron are connected together, zinc will corrode before iron. Therefore, in electrochemical corrosion, iron will combine with zinc to accelerate the corrosion of zinc, but at the same time zinc will protect iron based on the principle of galvanic cell (zinc as cathode loses electrons and becomes zinc ions, and electrons gather on anode iron to prevent iron from losing electrons).
In steel structures, carbon and iron will form primary cells (in wet weather), which accelerates the corrosion of iron, which is an important reason for the corrosion of steel structures (electrochemical corrosion).
The connection between zinc and steel structure is based on the principle that steel structure is easy to corrode (electrochemical corrosion), which in turn uses the principle of steel corrosion to protect steel structure. (generally called sacrificial anode cathodic protection law)
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