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The mechanism of action of heavy anti-corrosion paint mainly includes three core mechanisms: shielding and isolation, corrosion inhibition and passivation, and electrochemical protection. Shielding and isolation effect: After forming a film, heavy-duty anti-corrosion paint creates a dense coating that effectively prevents corrosive agents such as water, oxygen, and salts from penetrating the metal surface, thereby isolating it from a corrosive environment. This physical barrier effect forms the basis for long-term protection, and it is particularly crucial in harsh environments such as the ocean and chemical industries. Corrosion inhibition and passivation: The chemical rust-inhibiting pigments in the coating (such as chromates, phosphates, etc.) react with the metal surface to form stable passivation films or phosphating films, thereby suppressing the electrochemical corrosion process of the metal. This effect can compensate for any micro-porous defects in the shielding layer, thereby improving the overall corrosion resistance. Electrochemical protection: In zinc-rich heavy-duty anti-corrosion coatings, zinc powder is added to the coating as a metal that is more reactive than steel. When electrolytes penetrate, zinc corrodes preferentially, acting as a \"sacrificial anode\" to protect the steel matrix and achieve cathodic protection. This mechanism is commonly found in products such as epoxy zinc-rich primers. Furthermore, modern high-performance heavy-duty anti-corrosion coatings incorporate nanomaterials such as graphene; their layered structure helps to extend the path that corrosion agents must travel, thereby significantly enhancing the coating’s barrier properties and durability.