GB679599A - Modification of sulphuric acid electrolyte employed in the anodic treatment of aluminium and aluminium-rich alloys - Google Patents

Modification of sulphuric acid electrolyte employed in the anodic treatment of aluminium and aluminium-rich alloys

Info

Publication number
GB679599A
GB679599A GB421851A GB421851A GB679599A GB 679599 A GB679599 A GB 679599A GB 421851 A GB421851 A GB 421851A GB 421851 A GB421851 A GB 421851A GB 679599 A GB679599 A GB 679599A
Authority
GB
United Kingdom
Prior art keywords
aluminium
sulphate
acid
alum
sulphuric acid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB421851A
Inventor
Edmund Frederick Maillard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ESSEX AERO Ltd
Original Assignee
ESSEX AERO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ESSEX AERO Ltd filed Critical ESSEX AERO Ltd
Priority to GB421851A priority Critical patent/GB679599A/en
Publication of GB679599A publication Critical patent/GB679599A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D21/00—Processes for servicing or operating cells for electrolytic coating
    • C25D21/16—Regeneration of process solutions

Abstract

Sulphuric acid employed as the electrolyte in anodic oxidation treatment of aluminium articles is freed from dissolved aluminium by the addition of an alkali metal (including ammonium) sulphate to precipitate the double sulphate of aluminium and the alkali metal. Precipitation is effected by cooling to -5 DEG C to -10 DEG C, supercooling being avoided by stirring or seeding. An excess of sulphate (for example 100 grams of ammonium sulphate per litre) may be added to the acid which decreases the solubility of the alum. The addition of this quantity of sulphate cools the acid from for example 15-20 DEG C to 5 DEG C when the ammonium alum precipitates. The supernatant acid is replenished, the sulphate concentration restored and the acid used again. After further use the acid is cooled, the alum precipitated and the process repeated. Iron manganese and silicon impurities are largely removed on precipitation and filtration.
GB421851A 1951-02-21 1951-02-21 Modification of sulphuric acid electrolyte employed in the anodic treatment of aluminium and aluminium-rich alloys Expired GB679599A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB421851A GB679599A (en) 1951-02-21 1951-02-21 Modification of sulphuric acid electrolyte employed in the anodic treatment of aluminium and aluminium-rich alloys

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB421851A GB679599A (en) 1951-02-21 1951-02-21 Modification of sulphuric acid electrolyte employed in the anodic treatment of aluminium and aluminium-rich alloys

Publications (1)

Publication Number Publication Date
GB679599A true GB679599A (en) 1952-09-17

Family

ID=9772967

Family Applications (1)

Application Number Title Priority Date Filing Date
GB421851A Expired GB679599A (en) 1951-02-21 1951-02-21 Modification of sulphuric acid electrolyte employed in the anodic treatment of aluminium and aluminium-rich alloys

Country Status (1)

Country Link
GB (1) GB679599A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1621192B1 (en) * 1967-08-01 1971-04-08 Vaw Ver Aluminium Werke Ag PROCESS FOR REGENERATING COLOR ANODISING BATHS FOR ALUMINUM MATERIALS
US4211619A (en) * 1978-03-16 1980-07-08 Hoechst Aktiengesellschaft Process for anodically oxidizing aluminum and use of the material so prepared as a printing plate support
US4229266A (en) * 1978-08-23 1980-10-21 Hoechst Aktiengesellschaft Process for anodically oxidizing aluminum and use of the material so prepared as a printing plate support

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1621192B1 (en) * 1967-08-01 1971-04-08 Vaw Ver Aluminium Werke Ag PROCESS FOR REGENERATING COLOR ANODISING BATHS FOR ALUMINUM MATERIALS
US4211619A (en) * 1978-03-16 1980-07-08 Hoechst Aktiengesellschaft Process for anodically oxidizing aluminum and use of the material so prepared as a printing plate support
US4229266A (en) * 1978-08-23 1980-10-21 Hoechst Aktiengesellschaft Process for anodically oxidizing aluminum and use of the material so prepared as a printing plate support

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