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Based on the electrochemical principles of steel corrosion, steel corrosion can be prevented by preventing or disrupting the formation of a corrosion cell, or by strongly hindering the progress of the anodic and cathodic processes. The use of protective coatings to prevent corrosion of steel structures is a common practice today. The following are some of the commonly used protective coatings: 1. Metal protective coatings – These are metal or alloy materials with cathodic or anodic protection properties, which are applied to the surface of the metal that needs protection through methods such as electroplating, spraying, chemical plating, hot-dip plating, and immersion plating. This creates a protective layer on the metal surface, preventing contact between the metal and corrosive agents; or it utilizes electrochemical protection to safeguard the metal and thus prevent corrosion. 2. Chemical protective coating: A thin film of a compound with corrosion-resistant properties is formed on the surface of steel through chemical or electrochemical methods, thereby preventing contact between corrosive agents and the metal and stopping corrosion of the metal. 3. Non-metallic protective coatings: Materials such as paints, plastics, and enamel are used to create a protective layer on the metal surface through methods like brushing and spraying, thereby isolating the metal from corrosive agents and preventing corrosion.