The chromium-free corrosion inhibitors and methods of corrosion protection

The invention relates to a chromium-free aqueous corrosion protection agent for treating galvanised or alloy galvanised steel surfaces or aluminium surfaces. Said agent contains the following essential constituents: a) 0.5 to 10 g/l hexafluoro-anions of titanium (IV) and/or zircon (IV), b) 5 to 15 g/l vanadium ions, c) 0.5 to 2 g/l transition metal ions, preferably Mn, Fe, Co, d) 30 to 150 g/l phosphoric acid and/or phosphonic acid. The inventive corrosion protection agent preferably also contains an organic film former, especially with a polyacrylate base; and a conductivity pigment. The agent is particularly suitable for treating metal strips in order to protect them against corrosion, with or without subsequent painting, and is preferably applied in such a way as to produce a dry layer coating of 0.5 to 5 g/m on the surface.