IMPROVED METHOD FOR INCREASING THE CONCENTRATION OF IRON(II) IONS IN IRON SIDE PHOSPHATING SYSTEMS AND ACCORDING PHOSPHATING PLANT

摘要

The present invention refers to an improved method for increasing the concentration of iron(II) ions in iron side phosphating systems, which comprising the following steps:i) at least one magnet is attached onto the inside and/or outside wall of a phosphating bath container and/or hung, each one by means of at least one holder element, into the inside room of the bath container,ii) at least one iron-containing body is attached to the at least one magnet by means of magnetic forces, andiii) the phosphating bath container is filled with an acidic aqueous phosphating composition such that the at least one iron-containing body is at least partially immersed in the phosphating composition,as well as, subsequently, the following step:iv) iron(II) ions are dissolved out of the at least one iron-containing body into the phosphating composition such that the concentration of iron(II) ions in the phosphating composition is increased to a concentration of at least 0.5 g/l.;Moreover, the present invention also refers to an accordingly modified iron side phosphating plant.