Method for nickel-free phosphating metal surfaces

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United States of America Patent

PATENT NO 11643731
APP PUB NO 20200199758A1
SERIAL NO

16640581

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Abstract

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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, andii) with an acidic, aqueous, substantially nickel-free phosphating composition which comprises zinc ions, manganese ions and phosphate ions.

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Patent Owner(s)

  • CHEMETALL GMBH

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Dahlenburg, Olaf Frankfurt am Main, DE 10 6
Kolberg, Thomas Frankfurt am Main, DE 41 412
Seider, Lisa Frankfurt am Main, DE 3 1

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