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The anti-rust effect of zinc-rich primer mainly depends on the electrochemical protection principle. Zinc, as an active metal, has a lower electrode potential than iron. When zinc-rich primer is applied to the surface of steel, zinc powder forms an anode in the coating, and steel becomes the cathode.

Epoxy primer is an important part of the anti-corrosion coating system for aluminum products, especially suitable for use in severely corrosive environments. It has excellent adhesion and chemical resistance, and can form a hard protective film on the surface of aluminum to block the intrusion of moisture, oxygen and other corrosive substances.

Zinc-rich primer prevents metal corrosion through cathodic protection mechanism. Zinc has a lower potential than iron, so in a corrosive environment, zinc will be preferentially oxidized, thereby protecting the iron substrate. Iron oxide red primer prevents corrosive media from contacting the metal surface by forming a physical barrier.

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.

Anti-corrosion primers can be divided into the following types according to their composition, function and application occasions: 1. Epoxy anti-corrosion primer 2. Polyurethane anti-corrosion primer 3. Zinc powder anti-corrosion primer 4. Alkyd anti-corrosion primer 5. Water-based anti-corrosion primer

There are many types of protective paints. According to different substrates and uses, they can be roughly divided into epoxy resin paint, polyurethane paint, acrylic paint, fluorocarbon paint, and zinc powder paint.

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.

Main types of steel anti-corrosion coatings： 1. Epoxy anti-corrosion coatings 2. Polyurethane anti-corrosion coatings 3. Zinc-rich anti-corrosion coatings 4. Inorganic zinc silicate coatings 5. Asphalt-based anti-corrosion coatings 6. Polyurea anti-corrosion coatings 7. Acrylic anti-corrosion coatings

Epoxy zinc-rich primer: The zinc content is usually between 65% and 85%. Epoxy zinc-rich primer has excellent adhesion and chemical resistance, and is suitable for metal protection in industrial and marine environments.

Anti-corrosion coating is a type of coating specially used to protect the surface of materials from corrosion. It is mainly used for the protection of materials such as metals, concrete, and wood. Epoxy anti-corrosion coatings are anti-corrosion coatings made of epoxy resin as the main film-forming substance, with excellent mechanical properties, adhesion and chemical stability.