Phosphating is a chemical/electro-chemical process in which thin, fine-crystalline and water insoluble phosphates are generated on metal surfaces from phosphoric acid solutions in a dipping or spraying procedure.
As they are the result of a chemical reaction with the base metal, the pale or dark grey coloured metal phosphate layers are securely anchored in the metal surface and include many cavities and capillaries. This characteristic gives the phosphate layers an optimum absorption capacity for oils, waxes, colour pigments and lacquers, so they have proven their value as corrosion protection and as an adhesive substrate for paint and varnishes. A further characteristic of the phosphate layer is its ability to dissipate friction forces (as generated in deformation, drawing or sliding processes). So, in addition to an improvement of the surface quality of the pieces treated, the processing speed can be considerably increased with prolonged service life of the tools.