Invention Grant
- Patent Title: Method for nickel-free phosphating metal surfaces
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Application No.: US16640581Application Date: 2018-08-28
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Publication No.: US11643731B2Publication Date: 2023-05-09
- Inventor: Olaf Dahlenburg , Thomas Kolberg , Lisa Seider
- Applicant: Chemetall GmbH
- Applicant Address: DE Frankfurt
- Assignee: CHEMETALL GMBH
- Current Assignee: CHEMETALL GMBH
- Current Assignee Address: DE Frankfurt
- Agency: Armstrong Teasdale LLP
- Priority: EP 188783 2017.08.31
- International Application: PCT/EP2018/073056 2018.08.28
- International Announcement: WO2019/042951A 2019.03.07
- Date entered country: 2020-02-20
- Main IPC: C11D7/14
- IPC: C11D7/14 ; C11D7/26 ; C11D11/00 ; C23C22/36 ; C11D7/10 ; C23C22/78 ; C23G1/18

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.
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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