This invention relates to the manufacture of an aqueous based metal ion chelting composition

摘要

The use of a metal ion chelating agent in the manufacture of a coating composition for application on a metal surface to reduce friction drag is disclosed. The chelating agent may be present in an amount of 0.0031-0.20 wt. % and is typically 8 -hydroxyquinoline. An additional chelating agent, such as ethylene diamine tetra acetic acid (EDTA) , may also be included. The composition may further contain a wetting agent, a non-aqueous water soluble solvent, a thickener, and a pH controller to maintain an alkaline pH. Preferably, the composition is in the form of a liquid or spray. The composition may be applied to ship hulls or propeller blades and may also reduce erosion by cavitation.