Method for zinc phosphating metal components in series so as to form layers

A method for an anti-corrosion treatment of a series of metal components comprising metal components that have, at least in part, zinc surfaces, in which method the metal components of the series successively undergo the following wet-chemical treatment steps:

• (I) activation by contacting the metal components with an alkaline aqueous dispersion that has a D50 value of less than 3 μm and an inorganic particulate constituent of which comprises phosphates composed at least in part of hopeite, phosphophyllite, scholzite and/or hureaulite;
• the phosphates from the inorganic particulate constituent in the alkaline aqueous dispersion are present in an amount less than 0.8 g/kg calculated as PO4 and based on the dispersion;
• (II) zinc phosphating by contacting the metal components from step (I) with an acidic aqueous composition containing:
• (a) 5-50 g/kg of phosphate ions,
• (b) 0.3-3 g/kg of zinc ions, and
• (c) at least one source of free fluoride, wherein the concentration of free fluoride in the acidic aqueous composition is at least 0.5 mmol/kg,
• wherein the quotient of the concentration of the phosphates in the inorganic particulate constituent of the alkaline aqueous dispersion of step (I) in mmol/kg with respect to the sum of the concentration of free fluoride and the concentration of silicon in each case in the acidic aqueous composition of step (II), in each case in mmol/kg, is greater than 0.5.