US4670066A
Expired / Lapsed
US
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Process for the treatment by chemical conversion of substrates of zinc or of one of its alloys, concentrate and bath used for performing this process
Assignee: Compagnie Francaise de Produits Industriels SA
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Filing: 1985-08-15
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Granted: 1987-06-02
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Expires: 2005-08-15
Abstract
Abstract Process for the treatment by chemical conversion, within very short spaces of time of substrates of zinc or of one of its alloys especially of continuously zinc coated steel coils, wherein the bath employed in the phosphatization step proper comprises, besides the conventional constituents, a proportion of 0.3 to 2 g/l of Fe 2+ ions, this bath comprising also from 0.2 to 1.5 g/l, preferably from 0.2 to 1.2 gl/ of Zn 2+ ions and from 0.3 to 2 g/l, preferably from 0.3 to 1.2 g/l of Ni 2+ ions, the weight ratios Zn/Ni and Zn Fe being comprised between 0.1 and 5, these ratios being preferably comprised respectively between 0.4 and 2 and between 0.25 and 4.
Inventors
- 👤 Joseph Schapira
- 👤 Victor Ken
- 👤 Francois-Joseph Duboys
- 👤 Patrick Regnard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:30
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/07; C23C22/08; C23C22/12; C23C22/17
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
201 words
In a process for the treatment by chemical conversion of substrates of zinc or of one of its alloys including zinc coated steel coils intended to be painted, which process comprises successively at least: a preactivation step by means of titanium salts, the phosphatization step proper, one or several rinses with water, a drying step, each of the various steps of the treatment being performable by stream of by dipping, the improvement enabling the phosphatization step proper to be achieved in less than about 10 seconds and according to which the phosphatization step proper is carried out by way of a phosphatization bath comprising, besides the conventional constituents, a proportion from 0.3 to 2 g/l of Fe 2+ ions, a proportion from 0.2 to 1.5 g/l of Zn 2+ ions and a proportion from 0.3 to 2 g/l of Ni 2+ ions, said proportions being selected in such a way that the weight ratios Zn/Ni and Zn/Fe are comprised respectively between 0.4 and 2 and between 0.25 and 4, the said bath comprising also a sufficient proportion of a reducing agent for the reduction of the Fe 3+ ions, which result from the reaction of the Fe 2+ ions with air.
Claim 2
Dependent Claim
201 words
In a process for the treatment by chemical conversion of substrates of zinc or of one of its alloys including zinc coated steel coils intended to be painted, which process comprises successively at least: a preactivation step by means of titanium salts, the phosphatization step proper, one or several rinses with water, a drying step, each of the various steps of the treatment being performable by stream of by dipping, the improvement enabling the phosphatization step proper to be achieved in less than about 10 seconds and according to which the phosphatization step proper is carried out by way of a phosphatization bath comprising, besides the conventional constituents, a proportion from 0.3 to 2 g/l of Fe 2+ ions, a proportion from 0.2 to 1.5 g/l of Zn 2+ ions and a proportion from 0.3 to 2 g/l of Ni 2+ ions, said proportions being selected in such a way that the weight ratios Zn/Ni and Zn/Fe are comprised respectively between 0.4 and 2 and between 0.25 and 4, the said bath comprising also a sufficient proportion of a reducing agent for the reduction of the Fe 3+ ions, which result from the reaction of the Fe 2+ ions with air.
Claim 3
Dependent Claim
27 words
In the process according to claim 1, the improvement according to which the phosphatization bath comprises a proportion from 0.2 to 1.2 g/l of Zn 2+ ions.
Claim 4
Dependent Claim
27 words
In the process according to claim 1, the improvement according to which the phosphatization bath comprises a proportion from 0.3 to 1.2 g/l of Ni 2+ ions.
Claim 5
Dependent Claim
25 words
In the process according to claim 1, the improvement according to which the phosphatization bath comprises a reducing agent selected from ascorbic and oxalic acid.
Claim 6
Dependent Claim
24 words
In the process according to claim 1, the improvement according to which the phosphatization bath comprises a stoichiometric proportion of ascorbic or oxalic acid.
Claim 7
Dependent Claim
110 words
Phosphatizing bath to be used in the process according to claim 7 comprising, besides the conventional constituents, a proportion from 0.3 to 2 g/l of Fe 2+ ions, a proportion from 0.2 to 1.5 g/l of Zn 2+ ions and a proportion from 0.3 to 2 g/l of Ni 2+ ions, said proportions being selected in such a way that the weight ratios Zn/Ni and Zn/Fe are comprised respectively between 0.4 and 2 and between 0.25 and 4, the said bath comprising also a sufficient proportion of a reducing agent for the reduction of the Fe 3+ ions, which result from the reaction of the Fe 2+ ions with air.
Claim 8
Dependent Claim
18 words
Phosphatizing bath according to claim 6, comprising a proportion from 0.2 to 1.2 g/l of Zn 2+ ions.
Claim 9
Dependent Claim
18 words
Phosphatizing bath according to claim 6, comprising a proportion from 0.3 to 1.2 g/l of Ni 2+ ions.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-01 | 1990-12-01 | 1991-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-01 | 1994-12-01 | 1995-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-01 | 1998-12-01 | 1999-06-02 | $7700.00 | Window Closed / Lapsed |