Abstract: The invention relates to a device for activating a mediator species by way of electrolysis, including a voltage source and an anode connected to the voltage source and a cathode connected to the voltage source, the anode being enclosed in a liquid-permeable, electrically non-conductive sheath.

Abstract: A multi-step process for the anti-corrosive pretreatment of components component formed at least partially from metallic materials wherein first components are subjected to a conditioning wet-chemical treatment with an aqueous composition (A) that contains a salt of a quaternary amine and then to an additional wet-chemical treatment based on water-soluble compounds of the elements Zr, Ti and/or Si, in the course of which treatment a corresponding conversion of the surfaces of the metallic materials takes place, said treatment providing an anti-corrosive primer for additionally applied organic coatings.