Continuous electrolytic treatment for cleaning and conditioning aluminum surfaces
Abstract
Abstract HIGH SPEED CONTINUOUS TREATMENT OF ALUMINUM, E.G. ALUMINUM STRIP, IS OBTAINED FOR CLEANING THE SURFACE AND CONDITIONING IT FOR SUBSEQUENT APPLICATION OF LACQUER OR OTHER ORGANIC COATING, BY ELECTROLYTIC TREATMENT IN HOT ACIDIC ELECTROLYTE MAINTAINED IN TURBULENCE AT THE SURFACE OF THE TRAVELLING SHEET, EMPLOYING CURRENT AT LEVELS THAT PREFERABLY INVOLVE A VERY LOW TOTAL COULOMBIC CHARGE, FOR EXAMPLE IN A RANGE UP TO 3 COULOMBS PER SQUARE INCH. SPECIAL ADVANTAGE IN LACQUER PRETREATMENT AND THE LIKE IS REALIZED WITH ELECTRODE SEQUENCE SUCH THAT THE STRIP IS CATHODIC BOTH BEFORE AND AFTER ANODIC ACTION, AND ADDITIONALLY IMPROVED EFFICIENCY IS ACHIEVED WITH A SUBSTANTIALLY LARGER ANODIC AREA THAN THE TOTAL AREA OF CATHODIC POLARITY. EFFICIENT CLEANING AT HIGH SPEEDS IS OBTAINABLE IN THE LOWEST PORTION OF THE ABOVE RANGE OF COULOMBIC CHARGE, ADVANTEOUSLY WITH ELECTRODE AREAS REDUCED TO AFFORD RELATIVELY HIGH CURRENT DENSITIES.
Inventors
- 👤 W Cooke
- 👤 J Cote
- 👤 R Innes
- 👤 R Spooner
- 👤 W Kellermann
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |