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 alloysInfo
- 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
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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Removal Of Specific Substances (AREA)
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.
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)
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 |
-
1951
- 1951-02-21 GB GB421851A patent/GB679599A/en not_active Expired
Cited By (3)
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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