First, zinc phosphate plays multiple roles in coatings

Corrosion Guard: Zinc phosphate works collaboratively with other coating ingredients to form a strong protective film that effectively resists the corrosion of the coating by humidity, oxygen and polluted environment, significantly improving the corrosion resistance of the coating and extending its service life.

Anti-rust enhancer: zinc phosphate combines with metal ions in the paint to form a precipitate that is difficult to dissolve, slowing the release of metal ions on the surface of the paint, thereby effectively preventing the oxidation and corrosion of metal ions, and significantly improving the anti-rust performance of the paint.

Improved weather resistance: Zinc phosphate interacts with other coating additives to form a stable complex that enhances the coating's resistance to the external environment, resisting the invasion of natural factors such as oxidation, ultraviolet light and temperature changes, so that the coating shows better weather resistance.

Improved adhesion and coverage area: The chemical properties of zinc phosphate enable it to bond closely with the fillers and resins in the coating to form a strong complex that not only enhances the viscosity of the coating, but also makes it tighter, thereby improving the adhesion and coverage area of the coating.

In summary, zinc phosphate plays an indispensable role in coatings through its unique chemical and physical properties, significantly improving the corrosion resistance, rust prevention, weather resistance and adhesion of coatings.

Second, the amount of zinc phosphate added in the coating

The amount of zinc phosphate added should be determined according to the specific coating system. In general, the quality fraction of zinc phosphate added to the coating should be mastered between 2% and 5%. Excessive addition amount will lead to increased hardness of the coating, not easy to coat; Too low addition will affect the corrosion resistance of zinc phosphate, can not achieve the expected effect.

Third, the factors affecting the amount of zinc phosphate

The amount of zinc phosphate added is affected by many factors, including:

1. The type and quality of metal substrate: different metal substrates have different requirements for zinc phosphate, and different amounts of zinc phosphate need to be added according to the properties of different substrates;

2. Coating thickness: Coating thickness also has an effect on the amount of zinc phosphate added, in general, the thicker the coating, the amount of zinc phosphate added should be increased accordingly;

3. Characteristics of the coating system: Different coating systems have different requirements for zinc phosphate, in general, acidic coatings need to add more zinc phosphate, while neutral or alkaline coatings need to add relatively less zinc phosphate.

Iv. Summary

Zinc phosphate is a common coating additive, which can improve the corrosion resistance and weather resistance of coatings. The addition of zinc phosphate in the coating should be mastered between 2% and 5%, and the appropriate amount of addition should be selected according to the specific coating system. In addition, the amount of zinc phosphate added is also affected by the type and quality of the metal substrate, the thickness of the coating and the characteristics of the coating system.