IMPROVED METHOD FOR NICKEL-FREE PHOSPHATING METAL SURFACES
The present invention relates to a method for the substantially nickel-free phosphating of a metal surface, in which a metal surface is treated with the following compositions one after the other: i) with an alkaline, aqueous cleaning agent composition, which contains at least a water-soluble silica...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | The present invention relates to a method for the substantially nickel-free phosphating of a metal surface, in which a metal surface is treated with the following compositions one after the other: i) with an alkaline, aqueous cleaning agent composition, which contains at least a 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 cleaning agent composition itself and to a metal surface phosphate-coated by means of the above method and use thereof. |
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