Tri-n-decylamine is primarily used as a surfactant and corrosion inhibitor in industrial applications. It is effective in preventing rust and corrosion in metal processing and oil refining industries. Additionally, it serves as an intermediate in the synthesis of quaternary ammonium compounds, which are widely used in fabric softeners, disinfectants, and phase transfer catalysts. In the field of extraction and separation, tri-n-decylamine is utilized as a solvent for the extraction of metals like uranium and rare earth elements from ores and waste materials. Its ability to form stable complexes with metal ions makes it valuable in hydrometallurgical processes. Furthermore, it is employed in the production of lubricants and additives to enhance the performance of industrial fluids.