GB645443A - Improvements in or relating to the colouring of aluminium and its alloys - Google Patents
Improvements in or relating to the colouring of aluminium and its alloysInfo
- Publication number
- GB645443A GB645443A GB845648A GB845648A GB645443A GB 645443 A GB645443 A GB 645443A GB 845648 A GB845648 A GB 845648A GB 845648 A GB845648 A GB 845648A GB 645443 A GB645443 A GB 645443A
- Authority
- GB
- United Kingdom
- Prior art keywords
- ferric
- article
- aluminium
- immersion
- toning
- 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
A method of providing a brown or bronze finish on an article of aluminium or its alloys comprises forming an absorbent oxide coating on the surface of the article, precipitating ferric hydroxide within the coating, and then toning the colour by treatment with gallic, pyrogallic or like organic acid. The hydroxide may be precipitated by immersion of the coated surface in an aqueous solution of ferric ammonium oxalate, ferric sulphate, ferric chloride, ferric nitrate or ferric alum. After the toning treatment the article may be sealed against discolouration by immersion in boiling water or in a nickel acetate bath.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB845648A GB645443A (en) | 1948-03-22 | 1948-03-22 | Improvements in or relating to the colouring of aluminium and its alloys |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB845648A GB645443A (en) | 1948-03-22 | 1948-03-22 | Improvements in or relating to the colouring of aluminium and its alloys |
Publications (1)
Publication Number | Publication Date |
---|---|
GB645443A true GB645443A (en) | 1950-11-01 |
Family
ID=9852835
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB845648A Expired GB645443A (en) | 1948-03-22 | 1948-03-22 | Improvements in or relating to the colouring of aluminium and its alloys |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB645443A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3468767A (en) * | 1965-07-12 | 1969-09-23 | Anderson Mfg Co V E | Process of producing permanently colored aluminum |
-
1948
- 1948-03-22 GB GB845648A patent/GB645443A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3468767A (en) * | 1965-07-12 | 1969-09-23 | Anderson Mfg Co V E | Process of producing permanently colored aluminum |
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