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Epoxy primer is the most common and widely used primer, especially for aluminum hulls. Epoxy primer has excellent corrosion resistance and adhesion, and can form a solid barrier on the aluminum surface to prevent the penetration of moisture and oxygen and prevent corrosion of the hull.

Based on the above classification, we can clearly say that epoxy primer is indeed a type of anticorrosive paint. Epoxy primer not only has the adhesion enhancement effect of general primers, but more importantly, it plays a vital protective role in the anticorrosion system.

Concrete is a porous material with high water absorption. This means that when the paint is directly applied to its surface, it is easily absorbed by the concrete, resulting in uneven distribution of the paint and affecting the overall effect.

In some application scenarios that require both anti-corrosion performance and adhesion, you can consider using the two primers in combination. For example, a metal etch primer can be applied first to improve adhesion and then an epoxy primer can be applied to provide long-term corrosion protection.

Although both epoxy primers and epoxy topcoats are based on epoxy resins, their chemical composition and formulations are different. The formulation of epoxy primers focuses more on enhancing adhesion and corrosion protection, so more active ingredients and preservatives are usually added.

In some industrial environments, chemicals such as acids, alkalis, and chemical solvents can corrode metals. If the primer does not have sufficient chemical corrosion resistance, the chemicals may penetrate through the coating to the metal surface, causing rust.

Zinc-rich primers are a type of coating rich in zinc powder that performs well in the field of corrosion protection due to its cathodic protection. Zinc powder forms an electrochemical reaction with steel in the coating, corroding before steel, thereby protecting the steel from corrosion.

Zinc-rich primer prevents steel corrosion through the anodic protection of zinc, which is an electrochemical protection. The epoxy primer forms a dense shielding layer to isolate moisture and oxygen and prevent the oxidation of the substrate, which is a physical shielding protection.

Anticorrosion primer is a coating used on metal surfaces. Its main function is to prevent metal oxidation and corrosion by forming a dense protective film to isolate air, moisture, salt and other corrosive substances from contact.

Polyurethane primers can maintain good construction performance at lower temperatures, so they are more convenient for construction in cold climates. Epoxy primers require higher temperatures to fully cure, which may require additional heating equipment in cold climates.