US4464232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of one-side electroplated steel sheet
Assignee: Nippon Steel Corp
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Filing: 1983-11-23
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Granted: 1984-08-07
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Expires: 2003-11-23
Abstract
Abstract A process for producing one-side electroplated steel sheet with the non-electroplating side having a high affinity for chemical conversion treatment is disclosed. The process comprises preparing a one-side electroplated steel sheet by applying a cathodic current thereto in an acidic plating bath simultaneously while slightly electroplating the non-electroplating surface thereof with a coating weight of 0.5 to 5 g/m2 by applying a cathodic current through said non-electroplating surface, and then applying electrolysis to said non-electroplating surface by passing an anodic current through said non-electroplating surface to thoroughly remove said electrodeposition on said non-electroplating surface.
Inventors
- 👤 Shigeru Wakano
- 👤 Akito Sakoda
- 👤 Kunihiro Fukui
- 👤 Minoru Nishihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:03
CPC Classifications
C; C25; C25F; C25F5/00; C25D; C25D5/00; C25D5/02; C25D5/028; C25D5/48; Y; Y10; Y10S; Y10S204/00; Y10S204/07
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
94 words
A process for producing one-side electroplated steel sheet with the non-electroplating side having a high affinity for chemical conversion treatment, which comprises preparing a one-side electroplated steel sheet by applying a cathodic current to the electroplating side in an acidic plating bath, simultaneously slightly electroplating the non-electroplating surface thereof with a coating weight of 0.5 to 5 g/m 2 by applying a cathodic current through said non-electroplating surface, and then applying electrolysis to said non-electroplating surface by passing an anodic current through said non-electroplating surface to thoroughly remove the electrodeposits on said non-electroplating surface.
Claim 2
Dependent Claim
94 words
A process for producing one-side electroplated steel sheet with the non-electroplating side having a high affinity for chemical conversion treatment, which comprises preparing a one-side electroplated steel sheet by applying a cathodic current to the electroplating side in an acidic plating bath, simultaneously slightly electroplating the non-electroplating surface thereof with a coating weight of 0.5 to 5 g/m 2 by applying a cathodic current through said non-electroplating surface, and then applying electrolysis to said non-electroplating surface by passing an anodic current through said non-electroplating surface to thoroughly remove the electrodeposits on said non-electroplating surface.
Claim 3
Dependent Claim
19 words
A process as defined in claim 1, in which said electrolysis is carried out in an alkaline electrolysis bath.
Claim 4
Dependent Claim
19 words
A process as defined in claim 2, in which the pH of the electrolysis bath is 8 to 12.
Claim 5
Dependent Claim
15 words
A process as defined in claim 3, in which the pH is 9.5 to 11.0.
Claim 6
Dependent Claim
31 words
A process as defined in claim 1, in which said anodic current is passed from the steel sheet to be treated through a current passing system of the direct contact type.
Claim 7
Dependent Claim
27 words
A process as defined in claim 5, in which no current is passed through the electroplated surface while removing the once electroplated layer from the non-electroplating surface.
Claim 8
Dependent Claim
55 words
A process as defined in claim 2, in which the electrolysis is carried out using an electrolyte which comprises the combination of at least one selected from the group consisting of sulfuric acid, carbonic acid and boric acid with at least one selected from the group consisting of sodium hydroxide, potassium hydroxide and ammonium hydroxide.
Claim 9
Dependent Claim
19 words
A process as defined in claim 7, in which the pH of the electrolysis bath is 8 to 12.
Claim 10
Dependent Claim
22 words
A process as defined in claim 7, in which said electrolyte is comprised of sodium sulfate plus sodium hydroxide or sodium carbonate.
Claim 11
Dependent Claim
16 words
A process as defined in claim 7, in which aluminium ions are present in said electrolyte.
Claim 12
Dependent Claim
122 words
A process for producing one-side electroplated steel sheet with the non-electroplating side having a high affinity for chemical conversion treatment, which comprises preparing a one-side electroplated steel sheet by applying a cathodic current to the electroplating side in an acidic plating bath, simultaneously slightly electroplating the non-electroplating surface thereof with a coating weight of 0.5 to 5 g/m 2 by applying a cathodic current through said non-electroplating surface, then applying electrolysis to said non-electroplating surface by passing an anodic current through said non-electroplating surface to thoroughly remove the electrodeposits on said non-electroplating surface, and applying a cathodic current in an amount of 10 A/dm 2 or less to said electroplating side during the application of said anodic current to the non-electroplating surface.
Claim 13
Dependent Claim
122 words
A process for producing one-side electroplated steel sheet with the non-electroplating side having a high affinity for chemical conversion treatment, which comprises preparing a one-side electroplated steel sheet by applying a cathodic current to the electroplating side in an acidic plating bath, simultaneously slightly electroplating the non-electroplating surface thereof with a coating weight of 0.5 to 5 g/m 2 by applying a cathodic current through said non-electroplating surface, then applying electrolysis to said non-electroplating surface by passing an anodic current through said non-electroplating surface to thoroughly remove the electrodeposits on said non-electroplating surface, and applying a cathodic current in an amount of 10 A/dm 2 or less to said electroplating side during the application of said anodic current to the non-electroplating surface.
Claim 14
Dependent Claim
19 words
A process as defined in claim 11, in which said electrolysis is carried out in an alkaline electrolysis bath.
Claim 15
Dependent Claim
19 words
A process as defined in claim 12, in which the pH of the electrolysis bath is 8 to 12.
Claim 16
Dependent Claim
15 words
A process as defined in claim 13, in which the pH is 9.5 to 11.0.
Claim 17
Dependent Claim
31 words
A process as defined in claim 11, in which the anodic current is passed from the steel sheet to be treated through a current passing system of the direct contact type.
Claim 18
Dependent Claim
55 words
A process as defined in claim 12, in which the electrolysis is carried out using an electrolyte which comprises the combination of at least one selected from the group consisting of sulfuric acid, carbonic acid and boric acid with at least one selected from the group consisting of sodium hydroxide, potassium hydroxide and ammonium hydroxide.
Claim 19
Dependent Claim
22 words
A process as defined in claim 16, in which said electrolyte is comprised of sodium sulfate plus sodium hydroxide or sodium carbonate.
Claim 20
Dependent Claim
16 words
A process as defined in claim 16, in which aluminum ions are present in said electrolyte.
Claim 21
Dependent Claim
19 words
A process as defined in claim 16, in which the pH of the electrolysis bath is 8 to 12.
Claim 22
Dependent Claim
19 words
A process as defined in claim 19, in which the pH of the electrolysis bath is 9.5 to 11.0.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-07 | 1988-02-06 | 1988-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-07 | 1992-02-06 | 1992-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-07 | 1996-02-06 | 1996-08-07 | $7700.00 | Window Closed / Lapsed |