GB396204A - Improvements in or relating to the treatment of the surfaces of aluminium or aluminium alloy articles - Google Patents

Improvements in or relating to the treatment of the surfaces of aluminium or aluminium alloy articles

Info

Publication number
GB396204A
GB396204A GB1629832A GB1629832A GB396204A GB 396204 A GB396204 A GB 396204A GB 1629832 A GB1629832 A GB 1629832A GB 1629832 A GB1629832 A GB 1629832A GB 396204 A GB396204 A GB 396204A
Authority
GB
United Kingdom
Prior art keywords
treatment
aluminium
coating
acid
sulphuric
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
GB1629832A
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.)
ALUMINUM COLORS Inc
Original Assignee
ALUMINUM COLORS Inc
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 ALUMINUM COLORS Inc filed Critical ALUMINUM COLORS Inc
Priority to GB1629832A priority Critical patent/GB396204A/en
Publication of GB396204A publication Critical patent/GB396204A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/82—After-treatment
    • C23C22/83—Chemical after-treatment

Landscapes

  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Treatment Of Metals (AREA)

Abstract

White coatings are produced on aluminium or aluminium alloy articles by forming an adherent oxide coating on the metal surface and then, without the application of external electrical energy, removing the coloured constituents of the coating by treatment with a suitable reagent. The oxide coating may be produced either chemically, for example by treatment with a solution containing an alkali metal carbonate and a soluble dichromate, or anodically in an electrolyte of sulphuric or oxalic acid. The reagent for removing the coloured constituents of the coating may be a solution of sulphuric acid, nitric acid, a mixture of sulphuric and nitric acids, or hydrofluoric acid, the latter being preferred in the treatment of anodically produced coatings. Details of the concentration, temperature, &c. of the coating solutions and of the acid solutions used for the whitening treatment are given in the Specification.
GB1629832A 1932-06-09 1932-06-09 Improvements in or relating to the treatment of the surfaces of aluminium or aluminium alloy articles Expired GB396204A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1629832A GB396204A (en) 1932-06-09 1932-06-09 Improvements in or relating to the treatment of the surfaces of aluminium or aluminium alloy articles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1629832A GB396204A (en) 1932-06-09 1932-06-09 Improvements in or relating to the treatment of the surfaces of aluminium or aluminium alloy articles

Publications (1)

Publication Number Publication Date
GB396204A true GB396204A (en) 1933-08-03

Family

ID=10074789

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1629832A Expired GB396204A (en) 1932-06-09 1932-06-09 Improvements in or relating to the treatment of the surfaces of aluminium or aluminium alloy articles

Country Status (1)

Country Link
GB (1) GB396204A (en)

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