Method for the cleaning and/or anti-corrosion pretreatment of a plurality of components comprising zinc-coated (zm) steel

A method for cleaning and/or anti-corrosion pretreatment of a plurality of components in series, in which the components of the series are at least partially composed of zinc-coated (ZM) steel and in which the components of the series each pass through successive method steps i)-iii):

• i) bringing the components into contact with an aqueous cleaning solution having a pH greater than 7.0 and containing at least one surfactant;
• ii) bringing at least the surfaces of the zinc-coated (ZM) steel of the components from step i) into contact with an aqueous agent containing at least one builder which comprises a salt of a Lewis acid-base pair in which the Lewis acid is selected from Li+, Na+, K+, Ca2+, Mg2+ or Al3+ and the Lewis base is selected from anions of a polyprotic Brønsted acid, and optionally at least one surfactant, wherein a total concentration of the builders is at least 0.4 mol/kg, but does not exceed 2.0 mol/kg;
• and
• iii) cleaning by bringing the components from step ii) into contact with a further aqueous cleaning solution, and/or anti-corrosion pretreatment by bringing into contact with an aqueous treatment solution of a first stage of a conversion treatment.