METHOD FOR SURFACE-TREATING A PROTECTIVELY COATED SUBSTRATE

摘要

A method is shown for surface-treating a protectively coated substrate (1), more particularly steel strip, for the purpose of enhancing the strength of adhesion with an adhesive (10), where the at least partly multi-phase protective coat (2) comprises at least zinc and magnesium. In order to provide a particular suitability for adhesive bonding, it is proposed that the protective coat (2) be subjected to a pickling treatment, directed substantially at at least one intermetallic Zn-Mg phase (4) of the protective coat (2), with acidic pickle, more particularly acid.