Which type of pigments provide barrier protection in coatings?

Lamellar pigments provide barrier protection in coatings due to their unique structure and orientation within the paint film. These pigments possess a flat, plate-like shape that allows them to be layered in such a way that they create a physical barrier, effectively impeding the movement of water, salts, and other corrosive elements through the paint film. This property is particularly valuable in coatings used for protective purposes, such as on metal surfaces, where preventing corrosion is crucial.

Their arrangement can also enhance the overall mechanical properties of the coating, improving its durability and resistance to wear. Lamellar pigments are often used in formulations designed for outdoor applications and environments prone to harsh weather conditions, where protection against moisture and chemical attack is essential.