Paint coating selection process

Coatings designed for corrosion protection require additional properties, which are achieved through various ingredients mixed into the resin and solvent solution

- Prof. A S Khanna, Retd. IIT Bombay, Chairman SSPC India

A paint coating, in simplified terms, is defined as a solution of resin dissolved in a suitable solvent. There are many types of coatings available that protect wooden surfaces from damage caused by water and moisture. However, coatings designed for corrosion protection require additional properties, which are achieved through various ingredients mixed into the resin and solvent solution.

Pigments are added to provide color to the coating; for instance, compounds such as zinc oxide (ZnO), titanium dioxide (TiO₂), and barium sulfate (BaSO₄) create a white color. Corrosion-resistant pigments like zinc phosphate and zinc chromate enhance the coating's ability to withstand corrosion.

Additionally, reinforcing pigments such as carbon fibers and glass flakes can be added to improve the coating's strength. There are also various additives, used in small quantities, that help control micro-properties of the coating, such as fast drying, proper pigment dispersion, and antimicrobial properties.