Passivation optimized based Ti / Zr metal surfaces

An aqueous agent chromium-free treatment of protector conversion corrosion of metal surfaces containing (A) one or more water-soluble compounds containing at least one atom selected from the elements titanium and / or zirconium, not the total concentration of these elements of less than 2.5 · 10-4 mol / l, but being not more than 2.0 · 10-2 mol / l. (B) one or hydrosoluble more compounds as fluoride ion source containing at least one fluorine atom, the above items of the components (A) and (B) for being present in the agent in a molar ratio A: B of 1 : z, where z is a real and higher number 6, wherein the agent further contains (C) one or more water soluble compounds that release copper ions containing at least a copper atom, and (D) one or more water-soluble compounds and / or water-dispersible releasing metal ions, but are not a source of fluoride ions, containing at least one metal atom selected from the group consisting of calcium, aluminum and / or iron and not the molar ratio D: B number total of the metal atoms of component (D) relative to the total number of the fluorine atoms of component (B) less than ** ** Formula component (D) at least one water-soluble compound and / or compound being hidrodisp ersable it is containing at least one aluminum atom and not the molar ratio of the total number of aluminum ions of component (D) relative to the total number of the fluorine atoms of component (B) exceeds ** ** Formula