GB974800A - Process for the chromate passivation of copper and copper-base alloys - Google Patents

Process for the chromate passivation of copper and copper-base alloys

Info

Publication number
GB974800A
GB974800A GB2670059A GB2670059A GB974800A GB 974800 A GB974800 A GB 974800A GB 2670059 A GB2670059 A GB 2670059A GB 2670059 A GB2670059 A GB 2670059A GB 974800 A GB974800 A GB 974800A
Authority
GB
United Kingdom
Prior art keywords
copper
gms
treatment
base alloys
chromate passivation
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
GB2670059A
Inventor
Sydney George Clarke
Jack Frederick Andrew
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.)
SECR AVIATION
Minister of Aviation
Original Assignee
SECR AVIATION
Minister of Aviation
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 SECR AVIATION, Minister of Aviation filed Critical SECR AVIATION
Priority to GB2670059A priority Critical patent/GB974800A/en
Publication of GB974800A publication Critical patent/GB974800A/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
    • C23C22/24—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 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 process for passivating a copper, or copper base alloy (e.g Cu-36% Zn or Cu-30% Zn), surface comprises treating it with an acidified solution containing chromate and/or dichromate ions, chloride and/or bromide ions and HCl and/or H2SO4 sufficient to give the solution a pH of 0.5-2.0 to produce a visible adherent protective film. Beneficial results can be obtained by adding a neutral sulphate such as Na2SO4. The immersion time is preferably 5-30 seconds and after treatment the surface is preferably washed and then dipped in warm water at a temperature of less than 50 DEG C. Suitable treating solutions are given within the following ranges: .Na2Cr2O7.2H2O.50-250 gms .NaCl.5- 15 gms .conc. H2SO4.6- 16 gms .Na2SO4.40-100 gms Other alloy surfaces referred to are Cu-Zn-Pb, Cu-Al and Cu-Sn, and the treatment of a Zn surface, for comparison purposes, is also described.
GB2670059A 1959-08-05 1959-08-05 Process for the chromate passivation of copper and copper-base alloys Expired GB974800A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2670059A GB974800A (en) 1959-08-05 1959-08-05 Process for the chromate passivation of copper and copper-base alloys

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2670059A GB974800A (en) 1959-08-05 1959-08-05 Process for the chromate passivation of copper and copper-base alloys

Publications (1)

Publication Number Publication Date
GB974800A true GB974800A (en) 1964-11-11

Family

ID=10247835

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2670059A Expired GB974800A (en) 1959-08-05 1959-08-05 Process for the chromate passivation of copper and copper-base alloys

Country Status (1)

Country Link
GB (1) GB974800A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2172614A (en) * 1985-03-20 1986-09-24 Omi Int Corp Passivation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2172614A (en) * 1985-03-20 1986-09-24 Omi Int Corp Passivation
FR2579228A1 (en) * 1985-03-20 1986-09-26 Omi Int Corp AQUEOUS COMPOSITION FOR THE PASSIVATION OF ZINC-COBALT ALLOYS AND PROCESS FOR THE PASSIVATION OF SUCH ALLOYS
US4776898A (en) * 1985-03-20 1988-10-11 Omi International Corporation Passivation

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