Method for nickel-free phosphating metal surfaces
Abstract:
The present invention relates to a method for substantially nickel-free phosphating of a metallic surface, wherein a metallic surface is treated one after the other with the following compositions:



i) with an alkaline, aqueous cleaner composition which comprises at least one water-soluble silicate, and
ii) with an acidic, aqueous, substantially nickel-free phosphating composition which comprises zinc ions, manganese ions and phosphate ions.




The invention also relates to the above cleaner composition itself and also to a metallic surface phosphate-coated by the above method, and to the use of said surface.
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