What is the primary function of anti-corrosion coatings?
Release date:
2023-03-07
Author: Jin Hua Heavy Anti-Corrosion
Anti-corrosion coatings are an indispensable type of paint; in addition to the common properties shared by all coatings, they also provide corrosion protection, thereby extending the service life of non-ferrous metals. Simply put, the anti-corrosion mechanism of these coatings works by preventing oxygen or other corrosive agents from coming into contact with the metal surface and causing oxidation.
Anti-corrosion coatings are an indispensable category of paint, offering not only the general properties common to all coatings but also providing corrosion protection to extend the service life of non‑ferrous metals. In simple terms, their anti-corrosion mechanism works by preventing oxygen or other corrosive agents from coming into contact with the metal surface. Beyond their typical coating characteristics, anti-corrosion coatings serve to protect non‑ferrous metals and prolong their lifespan. Their functions include inhibition and passivation: in addition to film-forming substances, these coatings may incorporate various pigments as needed. For example, when alkaline pigments are added, they neutralize moisture or acidic substances that penetrate the coating, maintaining a slightly alkaline environment at the interface between the coating and the metal, thereby promoting metal passivation and enhancing corrosion resistance. Some pigments can also react with fatty components in the film-forming material to generate metal soaps, which act as corrosion inhibitors. Furthermore, soluble pigments—such as chromium‑zinc salts—release chromate ions upon contact with water.
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