GB621874A - Improvements in or relating to oxide-coated aluminium articles - Google Patents
Improvements in or relating to oxide-coated aluminium articlesInfo
- Publication number
- GB621874A GB621874A GB21637/46A GB2163746A GB621874A GB 621874 A GB621874 A GB 621874A GB 21637/46 A GB21637/46 A GB 21637/46A GB 2163746 A GB2163746 A GB 2163746A GB 621874 A GB621874 A GB 621874A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bath
- oxalate
- aluminium
- treatment
- per cent
- 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
- C25D11/18—After-treatment, e.g. pore-sealing
- C25D11/24—Chemical after-treatment
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
The Specification as open to inspection under Sect. 91, comprises the treatment of articles made of aluminium or aluminium alloy and having an oxide-coating produced by non-electrolytic means. The article is immersed in an aqueous bath containing 1 to 20 per cent by weight of pH of 4.5 to 8, and at a temperature of 100 DEG dissolved oxalate of one or more alkali metals or ammonium, said bath being at a to 200 DEG F. so as to prevent irregular colouring and spotting of the coating by a subsequent colouring step. The pH may be adjusted by adding sodium or potassium hydroxide or oxalic acid, and the time of treatment is 1 to 30 minutes. The bath may also contain normal or complex aluminium oxalate salts the aluminium content of which does not exceed 40 per cent by weight of the dissolved alkali metal oxalate. On coming from the oxalate bath, the articles may be rinsed in water, immersed briefly in a 5 to 25 per cent sulphuric acid bath at room temperature, again rinsed, and thereafter dyed. The application of this treatment to non-electrolytic coatings does not appear in the Specification as accepted.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US621874XA | 1943-02-20 | 1943-02-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB621874A true GB621874A (en) | 1949-04-21 |
Family
ID=22040768
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB21637/46A Expired GB621874A (en) | 1943-02-20 | 1946-07-19 | Improvements in or relating to oxide-coated aluminium articles |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB621874A (en) |
-
1946
- 1946-07-19 GB GB21637/46A patent/GB621874A/en not_active Expired
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