Used as a corrosion inhibitor in primers and coatings for aluminum and other metals, especially in aerospace and aviation industries. Provides protective layer against moisture and environmental degradation. Employed in cathodic protection systems and in the formulation of anti-rust paints for high-stress metal structures. Also utilized in some electroplating processes to enhance adhesion and durability of metal coatings. However, due to its toxicity and carcinogenic nature as a chromate compound, its use is strictly regulated, and there is a trend towards safer alternative materials.