Phosphating is a chemical treatment of the surface of the steel to increase corrosion resistance and improve adhesion for further surface treatments. It is one of the most widespread methods of chemically treating the surface of the steel in which water - insoluble crystalline tertiary phosphates of zinc, iron, manganese are formed on the surface. The phosphate layer does not provide sufficient corrosion protection on itself for the steel product and is therefore always additionally treated with preservatives, coatings, waxes, and the like. An important feature of phosphate coatings is their ability to bind organic matter - plastic lubricants or impregnating oils that significantly protect against corrosion. Phoosphating forms a protective layer with a thicknees of about 2 µm. It is immersed in a bath, followed by rinsing, passivation and rinsing. Degreasing takes place at temperatures between 30º C and 60º C.
