Chromating is a chemical surface treatment of aluminum in which a conversion layer based on chromium compounds is formed on the metal. This coating serves a protective function, protecting the aluminum from corrosion and preparing it for subsequent steps, such as powder coating.

The process begins with thorough cleaning and degreasing of the components. The aluminum is then subjected to a chromate bath, where a chemical reaction occurs that creates a uniform conversion layer. Once the treatment is complete, the surface is dried to harden the coating and remove any chemical residue.

Chromatizing is crucial in industries requiring the highest quality, such as aviation, automotive, and electronics, as it ensures durability, resistance to environmental factors, and excellent adhesion of paints and varnishes.

The process is performed in accordance with MIL-DTL-5541 and ISO 4520 standards, and modern technologies also utilize hexavalent chromium-free solutions that comply with the RoHS directive.