Zinc-Rich Coatings

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Zinc-rich coatings are characterized by their high zinc dust content, which is the key to their protective properties. There are two main types:

• Organic zinc-rich coatings: These use polyurethane or epoxy as binders.
• Inorganic zinc-rich coatings: These utilize silicate binders.

These coatings are especially effective on steel surfaces. When exposed to environmental factors, the zinc particles corrode before the steel does, thereby forming a sacrificial layer. This process creates a protective barrier, helping the steel to resist corrosion.

Despite their durability, zinc-rich coatings are susceptible to acids and alkaline substances. Therefore, they are often used as primers in multi-coat systems, followed by a more resilient topcoat. Zinc-rich coatings are ideal for environments with high corrosion levels, such as bridges.