GB990352A - Improvements relating to the chromating of aluminium - Google Patents

Improvements relating to the chromating of aluminium

Info

Publication number
GB990352A
GB990352A GB376463A GB376463A GB990352A GB 990352 A GB990352 A GB 990352A GB 376463 A GB376463 A GB 376463A GB 376463 A GB376463 A GB 376463A GB 990352 A GB990352 A GB 990352A
Authority
GB
United Kingdom
Prior art keywords
seo2
cro3
aluminium
acid
solution
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
GB376463A
Inventor
Dennis Brian Freeman
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.)
Pyrene Co Ltd
Original Assignee
Pyrene Co 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 Pyrene Co Ltd filed Critical Pyrene Co Ltd
Priority to GB376463A priority Critical patent/GB990352A/en
Publication of GB990352A publication Critical patent/GB990352A/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
    • C23C22/05—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 using aqueous solutions
    • C23C22/06—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 using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/34—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 using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides
    • C23C22/37—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 using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides containing also hexavalent chromium compounds

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

A chromate coating is formed on a surface of aluminium or aluminium base alloy by treatment, e.g. spraying or immersion at room temperature to 140 DEG F., with an aqueous acid solution containing the hexavalent chromium ion, e.g. 1-10 g./l. CrO3, and the fluoride ion, e.g. 0.05-5 g./l. F as HF, HBF4 or H2SiF6, together with a selenium compound wherein the concentration of SeO2 is less than that of CrO3 and less than 10 g./l., e.g. 0.5-3 g./l. SeO2 as selenium dioxide, selenious/selenic acid or a Se salt. The solution may further contain an aliphatic a -amino acid in which one or both of the H atoms of the amino group may be substituted, such as glycine, sarcosine or E.D.T.A., e.g. 0.1-10 g./l., in which case the SeO2 concentration is 0.05-1 g./l. and the pH between 1 and 4. A comparative solution is specifical containing CrO3, Na2CO3, boric acid and HF. Specification 846,363 also is referred to.
GB376463A 1963-08-15 1963-08-15 Improvements relating to the chromating of aluminium Expired GB990352A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB376463A GB990352A (en) 1963-08-15 1963-08-15 Improvements relating to the chromating of aluminium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB376463A GB990352A (en) 1963-08-15 1963-08-15 Improvements relating to the chromating of aluminium

Publications (1)

Publication Number Publication Date
GB990352A true GB990352A (en) 1965-04-28

Family

ID=9764510

Family Applications (1)

Application Number Title Priority Date Filing Date
GB376463A Expired GB990352A (en) 1963-08-15 1963-08-15 Improvements relating to the chromating of aluminium

Country Status (1)

Country Link
GB (1) GB990352A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3307980A (en) * 1962-08-15 1967-03-07 Hooker Chemical Corp Treatment of metal surfaces
US3329536A (en) * 1963-07-11 1967-07-04 Hooker Chemical Corp Solution and accelerated process for coating aluminum
US3505129A (en) * 1967-01-16 1970-04-07 Hooker Chemical Corp Chemical coating process for metal

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3307980A (en) * 1962-08-15 1967-03-07 Hooker Chemical Corp Treatment of metal surfaces
US3329536A (en) * 1963-07-11 1967-07-04 Hooker Chemical Corp Solution and accelerated process for coating aluminum
US3505129A (en) * 1967-01-16 1970-04-07 Hooker Chemical Corp Chemical coating process for metal

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