1. Change the internal structure of the metal: such as making various corrosion-resistant alloys, Surface Finishing such as adding chromium and nickel to ordinary steel to make stainless steel.
2. Protective layer method: Cover the metal surface with a protective layer to isolate the metal product from the surrounding corrosive medium, thereby preventing corrosion;
3. Electrochemical protection method: use the principle of galvanic cell to protect metal, and try to eliminate the galvanic cell reaction that causes electrochemical corrosion.
4. Treatment of corrosive media: Exclude corrosive media, such as frequently wiping metal equipment, placing desiccant in precision instruments, adding a small amount of corrosion inhibitor to corrosive media, etc.
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