GB589887A - Improvements in or relating to the protective surface treatment of articles made of or coated with zinc, zinc alloys, cadmium or cadmium alloys - Google Patents

Improvements in or relating to the protective surface treatment of articles made of or coated with zinc, zinc alloys, cadmium or cadmium alloys

Info

Publication number
GB589887A
GB589887A GB584845A GB584845A GB589887A GB 589887 A GB589887 A GB 589887A GB 584845 A GB584845 A GB 584845A GB 584845 A GB584845 A GB 584845A GB 589887 A GB589887 A GB 589887A
Authority
GB
United Kingdom
Prior art keywords
cadmium
alloys
zinc
per cent
acid
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
GB584845A
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.)
J V RUSHTON LONDON Ltd
Original Assignee
J V RUSHTON LONDON 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 J V RUSHTON LONDON Ltd filed Critical J V RUSHTON LONDON Ltd
Priority to GB584845A priority Critical patent/GB589887A/en
Publication of GB589887A publication Critical patent/GB589887A/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
    • C23C22/30—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 containing also trivalent chromium

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

In a method of coating zinc and zinc alloys or cadmium or p cadmium alloys as described in Specifications 586,517 and 586,542, a chromicsulphuric acid mixture contains not less than 0.5 per cent. trivalent chromium, 3 to 16 per cent. free or combined chromic acid and between 0.5 per cent. and 4 per cent. free sulphuric acid, the ratio of hexavalent chromium to trivalent chromium being not less than 3:1 and the ratio of hexavalent chromium to sulphuric acid being not less than 2:1 and not greater than 20:1. Two examples of the solution are given in each case the quantity of trivalent chromium is obtained by the presence of sodium bisulphite as a reducing agent. An oxidising agent may also be present, e.g., sodium nitrate to the amount of one-fifth to one-tenth of the total chromic acid, or an equivalent proportion of another oxidising agent. A wetting agent and an acid inhibitor are also preferably included. The proportion of trivalent chromium should not exceed 1.5 per cent. to produce satisfactory films.
GB584845A 1945-03-08 1945-03-08 Improvements in or relating to the protective surface treatment of articles made of or coated with zinc, zinc alloys, cadmium or cadmium alloys Expired GB589887A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB584845A GB589887A (en) 1945-03-08 1945-03-08 Improvements in or relating to the protective surface treatment of articles made of or coated with zinc, zinc alloys, cadmium or cadmium alloys

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB584845A GB589887A (en) 1945-03-08 1945-03-08 Improvements in or relating to the protective surface treatment of articles made of or coated with zinc, zinc alloys, cadmium or cadmium alloys

Publications (1)

Publication Number Publication Date
GB589887A true GB589887A (en) 1947-07-02

Family

ID=9803764

Family Applications (1)

Application Number Title Priority Date Filing Date
GB584845A Expired GB589887A (en) 1945-03-08 1945-03-08 Improvements in or relating to the protective surface treatment of articles made of or coated with zinc, zinc alloys, cadmium or cadmium alloys

Country Status (1)

Country Link
GB (1) GB589887A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3090710A (en) * 1959-05-27 1963-05-21 Hooker Chemical Corp Method and solution for producing chromate coatings on zinc and zinc alloys
CN113549911A (en) * 2021-07-27 2021-10-26 贵州航天精工制造有限公司 Zinc-plating colorful passivation solution and passivation process thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3090710A (en) * 1959-05-27 1963-05-21 Hooker Chemical Corp Method and solution for producing chromate coatings on zinc and zinc alloys
CN113549911A (en) * 2021-07-27 2021-10-26 贵州航天精工制造有限公司 Zinc-plating colorful passivation solution and passivation process thereof

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