METHOD FOR THE SELECTIVE REMOVAL OF ZINC IONS FROM ALKALINE BATH SOLUTIONS IN THE SERIAL SURFACE TREATMENT OF METAL COMPONENTS

摘要

The present invention relates to a method for the serial surface treatment of metal components that have zinc surfaces, wherein the method comprises an alkaline pretreatment, and a method for the selective removal of zinc ions from an alkaline bath solution for the serial surface treatment of metal surfaces that have zinc surfaces. According to the invention, in order to perform each method, part of the alkaline aqueous bath solution is brought in contact with an ion exchange resin that bears functional groups selected from —OPO₃X_2/n and/or —PO₃X_2/n, wherein X is either a hydrogen atom or an alkali metal and/or alkaline-earth metal atom to be exchanged having the particular valency n.