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 alloys

Info

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
Application number
GB845648A
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.)
LESLIE GOODRIDGE TOTTLE
UNITED ANODISING Ltd
Original Assignee
LESLIE GOODRIDGE TOTTLE
UNITED ANODISING 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 LESLIE GOODRIDGE TOTTLE, UNITED ANODISING Ltd filed Critical LESLIE GOODRIDGE TOTTLE
Priority to GB845648A priority Critical patent/GB645443A/en
Publication of GB645443A publication Critical patent/GB645443A/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
    • 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.
GB845648A 1948-03-22 1948-03-22 Improvements in or relating to the colouring of aluminium and its alloys Expired GB645443A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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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