Method of electrolytic descaling and pickling
Abstract
Abstract METHOD OF DISCALING AND PICKLING TITANIUM AND TITANIUM BASE ALLOY ARTICLES BY IMMERSING THE ARTICLE IN A FIRST ELECTROLYTE CONSISTING OF AN AQUEOUS SOLUTION OF ACID FROM THE GROUP CONSISTING OF PHOSPHORIC ACID AND SULPHURIC ACID WHILE PASSING ELECTRIC CURRENT THROUGH ELECTRODES IMMERSED IN THE ELECTROLYTE AS ANODES AND THROUGH THE ARTICLE AS A CATHODE FOLLOWED BY IMMERSING THE ARTICLE IN A SECOND ELECTROLYTE CONSISTING ESSENTIALLY OF A SOLUTION OF 0.125 TO 1 MOLE PER LIETER OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF SULPHURIC ACID, SODIUM SULPHATE, POTASSIUM SULPHATE AND AMMONIUM SULPHATE, UP TO 0.33 MOLE PER LITER OF A SOLUBLE DICHROMATE, AND 0.5 TO 1.5 MOLES PER LIETER OF HYDROFLUORIC ACID WITH THE BALANCE SUBSTANTIALLY WATER WHILE PASSING ELECTRIC CURRENT THROUGH ELECTRODES IMMERSED IN THE ELECTROLYTE AS CATHODES AND THROUGH THE ARTICLE AS AN ANODE.
Inventors
- 👤 Loren C Covington
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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |