Used as a corrosion-inhibiting pigment in protective coatings and primers, especially in industrial and marine environments. It functions by releasing phosphate ions that promote the formation of a passive layer on metal surfaces, enhancing resistance to rust and degradation. Commonly found in anti-corrosive paints for steel structures, pipelines, and automotive components. Its low toxicity compared to chromate-based inhibitors makes it an environmentally favorable alternative in water-based and high-performance coating systems.