Used primarily in surface treatment processes, especially in the preparation of metal surfaces for painting or coating. It forms a thin, protective conversion coating on aluminum and aluminum alloys, enhancing corrosion resistance and improving paint adhesion. Commonly applied in the aerospace, automotive, and construction industries where durable, long-lasting metal protection is required. Also utilized in the production of fluoride-containing chemicals and in some cases as an etching agent for glass or ceramics due to its reactivity with silica-based materials.