US3901771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
One-side electrocoating
Assignee: Inland Steel Co
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Filing: 1973-07-11
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Granted: 1975-08-26
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Expires: 1993-07-11
Abstract
Abstract A process of continuously electrolytically coating a metal strip on one-side-only while immersed in electrolyte containing the coating material by connecting the strip to the negative terminal of a plating rectifier with the positive terminal of the rectifier being connected to an anode disposed adjacent the one side of the strip to be plated, maintaining the other side of the strip which is not to be plated anodic by connecting the strip to the positive terminal of an etching rectifier with the negative terminal of the etching rectifier being connected to a cathodic electrode disposed in the electrolyte adjacent the side of the strip which is not to be plated, and setting the output of the plating rectifier at a level sufficient to deposit the required coating weight on the one side of the strip while the strip is moved continuously through the electrolyte, and regulating the output of the etching rectifier to a level below the output of the plating rectifier but sufficient to prevent objectionable ''''wrap-around'''' of coating material along the longitudinal edges of the strip and preferably at a level about one-tenth to onethird that of the plating rectifier. Any metal capable of being electrolytically deposited on a metal strip can be one-sidecoated by the present process, and the strip can also be electropainted using a conventional electropaint bath.
Inventors
- 👤 Griff W Froman
- 👤 Albert Ray Mullins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:35
CPC Classifications
C; C25; C25D; C25D7/00; C25D7/06; C25D7/0614; C25D7/0671; C25D5/00; C25D5/02; C25D5/028; Y; Y10; Y10S; Y10S204/00; Y10S204/07
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
315 words
IN A PROCESS OF CONTINUOUSLY ELECTROLYTICALLY DEPOSITING A COATING MATERIAL ON ONLY ONE LATERAL SURFACE OF A PRE-FORMED ELONGATED FLEXIBLE METALLIC STRIP OF ELECTRICALLY CONDUCTIVE MATERIAL WHILE PREVENTING SAID COATING MATERIAL DEPOSITING ON THE OTHER LATERAL SURFACE OF SAID STRIP AS SAID STRIP IS MOVED CONTINUOUSLY THROUGH AN ELECTROLYTE BATH WHICH CIRCULATES FREELY ABOUT ALL SURFACES OF SAID STRIP, THE IMPROVEMENT WHICH COMPRISES, A. MAINTAINING THE ONE LATERAL SURFACE OF SAID STRIP TO BE ELECTROLYTICALLY COATED CATHODIC BY ELECTRICALLY CONNECTING SAID STRIP WITH A NEGATIVE TERMINAL OF A PLATING RECTIFIER PROVIDING A FIRST SOURCE OF DIRECT ELECTRICAL CURRENT AND CONNECTING THE POSITIVE TERMINAL OF SAID PLATING RECTIFIER WITH AN ANODIC ELECTRODE IMMERSED IN SAID ELECTROLYTE BATH AND HAVING SAID ANODIC ELECTRODE DISPOSED IN SPACED RELATIONSHIP WITH AND ADJACENT THE SAID ONE LATERAL SURFACE, AND ADJUSTING THE ELECTRICAL OUTPUT OF SAID PLATING RECTIFIER TO A CURRENT DENSITY LEVEL SUFFICIENT TO MAINTAIN SAID ONE LATERAL SURFACE COMPLETELY CATHODIC AND ELECTROLYTICALLY DEPOSIT A COATING OF PREDETERMINED THICKNESS ON SAID ONE LATERAL SURFACE WHILE SAID STRIP REMAINS IMMERSED IN SAID ELECTROLYTE BATH, AND B. MAINTAINING THE SAID OTHER LATERAL SURFACE OF SAID STRIP ANODIC BY ELECTRICALLY CONNECTING A POSITIVE TERMINAL OF AN ETCHING RECTIFIER PROVIDING A SECOND SOURCE OF DIRECT ELECTRICAL CURRENT WITH SAID STRIP AND CONNECTING THE NEGATIVE TERMINAL OF SAID ETCHING RECTIFIER WITH A CATHODIC ELECTRODE IMMERSED IN SAID ELECTROLYTE BATH AND HAVING SAID CATHODIC ELECTRODE DISPOSED IN SPACED RELATIONSHIP WITH AND ADJACENT SAID OTHER LATERAL SURFACE OF THE SAID SHEET, AND ADJUSTING THE ELECTRICAL OUTPUT OF SAID ETCHING RECTIFIER TO A CURRENT DENSITY LEVEL WHICH IS SUFFICIENT TO MAINTAIN THE SAID OTHER LATERAL SURFACE COMPLETELY ANODIC AND AT A CURRENT DENSITY LEVEL BELOW THAT OF SAID PLATING RECTIFIER, WHEREBY SAID ONE LATERAL SURFACE IS ELECTROLYTICALLY COATED WITH SAID COATING MATERIAL AND SAID OTHER LATERAL SURFACE REMAINS ELECTROLYTICALLY UNCOATED BY SAID COATING MATERIAL DURING THE ELECTRODEPOSITION PROCESS.
Claim 2
Dependent Claim
315 words
IN A PROCESS OF CONTINUOUSLY ELECTROLYTICALLY DEPOSITING A COATING MATERIAL ON ONLY ONE LATERAL SURFACE OF A PRE-FORMED ELONGATED FLEXIBLE METALLIC STRIP OF ELECTRICALLY CONDUCTIVE MATERIAL WHILE PREVENTING SAID COATING MATERIAL DEPOSITING ON THE OTHER LATERAL SURFACE OF SAID STRIP AS SAID STRIP IS MOVED CONTINUOUSLY THROUGH AN ELECTROLYTE BATH WHICH CIRCULATES FREELY ABOUT ALL SURFACES OF SAID STRIP, THE IMPROVEMENT WHICH COMPRISES, A. MAINTAINING THE ONE LATERAL SURFACE OF SAID STRIP TO BE ELECTROLYTICALLY COATED CATHODIC BY ELECTRICALLY CONNECTING SAID STRIP WITH A NEGATIVE TERMINAL OF A PLATING RECTIFIER PROVIDING A FIRST SOURCE OF DIRECT ELECTRICAL CURRENT AND CONNECTING THE POSITIVE TERMINAL OF SAID PLATING RECTIFIER WITH AN ANODIC ELECTRODE IMMERSED IN SAID ELECTROLYTE BATH AND HAVING SAID ANODIC ELECTRODE DISPOSED IN SPACED RELATIONSHIP WITH AND ADJACENT THE SAID ONE LATERAL SURFACE, AND ADJUSTING THE ELECTRICAL OUTPUT OF SAID PLATING RECTIFIER TO A CURRENT DENSITY LEVEL SUFFICIENT TO MAINTAIN SAID ONE LATERAL SURFACE COMPLETELY CATHODIC AND ELECTROLYTICALLY DEPOSIT A COATING OF PREDETERMINED THICKNESS ON SAID ONE LATERAL SURFACE WHILE SAID STRIP REMAINS IMMERSED IN SAID ELECTROLYTE BATH, AND B. MAINTAINING THE SAID OTHER LATERAL SURFACE OF SAID STRIP ANODIC BY ELECTRICALLY CONNECTING A POSITIVE TERMINAL OF AN ETCHING RECTIFIER PROVIDING A SECOND SOURCE OF DIRECT ELECTRICAL CURRENT WITH SAID STRIP AND CONNECTING THE NEGATIVE TERMINAL OF SAID ETCHING RECTIFIER WITH A CATHODIC ELECTRODE IMMERSED IN SAID ELECTROLYTE BATH AND HAVING SAID CATHODIC ELECTRODE DISPOSED IN SPACED RELATIONSHIP WITH AND ADJACENT SAID OTHER LATERAL SURFACE OF THE SAID SHEET, AND ADJUSTING THE ELECTRICAL OUTPUT OF SAID ETCHING RECTIFIER TO A CURRENT DENSITY LEVEL WHICH IS SUFFICIENT TO MAINTAIN THE SAID OTHER LATERAL SURFACE COMPLETELY ANODIC AND AT A CURRENT DENSITY LEVEL BELOW THAT OF SAID PLATING RECTIFIER, WHEREBY SAID ONE LATERAL SURFACE IS ELECTROLYTICALLY COATED WITH SAID COATING MATERIAL AND SAID OTHER LATERAL SURFACE REMAINS ELECTROLYTICALLY UNCOATED BY SAID COATING MATERIAL DURING THE ELECTRODEPOSITION PROCESS.
Claim 3
Dependent Claim
30 words
A process as in claim 1, comprising adjusting the ampere output of said etching rectifier to a level between about one-tenth and one-third the ampere output of said plating rectifier.
Claim 4
Dependent Claim
29 words
A process as in claim 1, wherein said strip is a ferrous metal strip and said electrolyte contains metallic ions selected from the group consisting of zinc and nickel.
Claim 5
Dependent Claim
23 words
A process as in claim 1, wherein said strip is a ferrous metal strip and said electrolyte comprises a water soluble organic resin.
Claim 6
Dependent Claim
301 words
In a process of continuously electrolytically treating a pre-formed elongated flexible metallic strip of electrically conductive material in an electrolyte bath which prevents any of the electrolyte bath material depositing on more than one lateral surface of said strip and which etches the other surface of said metallic strip as said strip is moved continuously through a said electrolyte bath circulating freely about all surfaces of said strip, the improvement comprising; a. maintaining the one lateral surface of said strip cathodic by electrically connecting said strip with a negative terminal of a plating rectifier providing a first source of a direct electrical current and connecting the positive terminal of said plating rectifier with an anodic electrode immersed in said electrolyte bath, having said anodic electrode disposed in spaced relationship with and adjacent said one lateral surface, and adjusting the electrical output of said plating rectifier to a current density level sufficient to maintain said one lateral surface completely cathodic while said strip remains immersed in said electrolyte bath; and b. maintaining the said other lateral surface of said strip anodic by electrically connecting a positive terminal of an etching rectifier providing a second source of direct electrical current with said strip and connecting the negative terminal of said etching rectifier with a cathodic electrode immersed in said electrolyte bath, having said cathodic electrode disposed in spaced relationship with and adjacent said other lateral surface of the said sheet, and adjusting the electrical output of said etching rectifier to a current density level which is sufficient to maintain the said other lateral surface completely anodic, c. and controlling the amount of metal ions removed from said other surface during the said etching thereof by controlling the current density level of said etching rectifier relative to the current level of said plating rectifier.
Claim 7
Dependent Claim
301 words
In a process of continuously electrolytically treating a pre-formed elongated flexible metallic strip of electrically conductive material in an electrolyte bath which prevents any of the electrolyte bath material depositing on more than one lateral surface of said strip and which etches the other surface of said metallic strip as said strip is moved continuously through a said electrolyte bath circulating freely about all surfaces of said strip, the improvement comprising; a. maintaining the one lateral surface of said strip cathodic by electrically connecting said strip with a negative terminal of a plating rectifier providing a first source of a direct electrical current and connecting the positive terminal of said plating rectifier with an anodic electrode immersed in said electrolyte bath, having said anodic electrode disposed in spaced relationship with and adjacent said one lateral surface, and adjusting the electrical output of said plating rectifier to a current density level sufficient to maintain said one lateral surface completely cathodic while said strip remains immersed in said electrolyte bath; and b. maintaining the said other lateral surface of said strip anodic by electrically connecting a positive terminal of an etching rectifier providing a second source of direct electrical current with said strip and connecting the negative terminal of said etching rectifier with a cathodic electrode immersed in said electrolyte bath, having said cathodic electrode disposed in spaced relationship with and adjacent said other lateral surface of the said sheet, and adjusting the electrical output of said etching rectifier to a current density level which is sufficient to maintain the said other lateral surface completely anodic, c. and controlling the amount of metal ions removed from said other surface during the said etching thereof by controlling the current density level of said etching rectifier relative to the current level of said plating rectifier.
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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) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |