GB652743A - Improvements in and relating to the electrolytic deposition of protective coatings on aluminium and its alloys - Google Patents
Improvements in and relating to the electrolytic deposition of protective coatings on aluminium and its alloysInfo
- Publication number
- GB652743A GB652743A GB33990/47A GB3399047A GB652743A GB 652743 A GB652743 A GB 652743A GB 33990/47 A GB33990/47 A GB 33990/47A GB 3399047 A GB3399047 A GB 3399047A GB 652743 A GB652743 A GB 652743A
- Authority
- GB
- United Kingdom
- Prior art keywords
- salts
- alloys
- aluminium
- zinc
- magnesium
- 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
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
- C25D11/08—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing inorganic acids
Abstract
652,743. Electrolytic surface treatment of aluminium and its alloys. ANOX AKT.-GES. Dec. 23, 1947, No. 33990. Convention date, Oct. 4, 1939. [Class 41] In a process for the electrolytic deposition of opaque layers on aluminium and its alloys the electrolyte contains one or more chromic salts of zinc and/or magnesium and sufficient chromic acid to maintain the salts in solution, the salts being such that the metal from which they are formed does not enter into the composition of the deposited layer and the layer is more opaque and more heat resistant than that which is formed under the same operating conditions, but in the absence of the zinc and/or magnesium salts. The electrolyte may contain for example from 0.5 to 20 per cent of a zinc or magnesium salt. The process may be carried out at a voltage of from 10 to 30 volts, a current density of 1.8 to 2.5 amps. per sq. dcm., and a temperature of 20 to 80 C. Alternating or continuous current may be used.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT652743X | 1939-10-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB652743A true GB652743A (en) | 1951-05-02 |
Family
ID=11297779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB33990/47A Expired GB652743A (en) | 1939-10-04 | 1947-12-23 | Improvements in and relating to the electrolytic deposition of protective coatings on aluminium and its alloys |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US2356543A (en) |
| FR (1) | FR915603A (en) |
| GB (1) | GB652743A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2839455A (en) * | 1951-07-21 | 1958-06-17 | Armco Steel Corp | Anodizing of aluminum coated objects |
| US2788317A (en) * | 1954-02-25 | 1957-04-09 | Koenig And Pope | Aluminum and process applicable thereto |
-
1940
- 1940-08-13 US US352416A patent/US2356543A/en not_active Expired - Lifetime
-
1945
- 1945-10-08 FR FR915603D patent/FR915603A/en not_active Expired
-
1947
- 1947-12-23 GB GB33990/47A patent/GB652743A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2356543A (en) | 1944-08-22 |
| FR915603A (en) | 1946-11-13 |
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