GB586517A - Improvements in or relating to the protective surface treatment of zinc, zinc coated and zinc alloy articles - Google Patents

Improvements in or relating to the protective surface treatment of zinc, zinc coated and zinc alloy articles

Info

Publication number
GB586517A
GB586517A GB737044A GB737044A GB586517A GB 586517 A GB586517 A GB 586517A GB 737044 A GB737044 A GB 737044A GB 737044 A GB737044 A GB 737044A GB 586517 A GB586517 A GB 586517A
Authority
GB
United Kingdom
Prior art keywords
zinc
alkali
mixture
agent
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
GB737044A
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 GB737044A priority Critical patent/GB586517A/en
Publication of GB586517A publication Critical patent/GB586517A/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

Abstract

Protective surface films are produced on articles made of, or coated with, zinc or zinc alloys by treatment with an aqueous chromicsulphuric acid mixture containing prior to use, a proportion of the chromium in the trivalent condition, the latter preferably being produced by the addition of a reducing agent which does not introduce an undesirable foreign metal into the mixture such as an aldehyde or a sugar or an inorganic substance such as sulphur dioxide or an alkali sulphite, hydrosulphite or hypophosphite. To prevent over-reduction in the mixture, a proportion of an oxidising agent which does not introduce an undesirable foreign metal into the solution and which is sufficient to convert only part of the trivalent chromium into the hexavalent form is added. Example of such an agent is an alkali nitrate, nitrite, chlorate, perchlorate, perborate or persulphate. The mixture may also contain a wetting agent such as a sulphonated fatty alcohol or ester and also an acid inhibitor such as thioureas or quinoline compounds. When the materials are used in the dry form for preparation of the solution, an alkali bisulphate is used instead of sulphuric acid and the chromic acid p in the form of an alkali chromate or bichromate and the reducing, and wetting agents and also the inhibitor in the solid form. Zinc alloys containing not less than 85 per cent. of zinc and copper and/or aluminium are referred to.
GB737044A 1944-04-20 1944-04-20 Improvements in or relating to the protective surface treatment of zinc, zinc coated and zinc alloy articles Expired GB586517A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB737044A GB586517A (en) 1944-04-20 1944-04-20 Improvements in or relating to the protective surface treatment of zinc, zinc coated and zinc alloy articles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB737044A GB586517A (en) 1944-04-20 1944-04-20 Improvements in or relating to the protective surface treatment of zinc, zinc coated and zinc alloy articles

Publications (1)

Publication Number Publication Date
GB586517A true GB586517A (en) 1947-03-21

Family

ID=9831835

Family Applications (1)

Application Number Title Priority Date Filing Date
GB737044A Expired GB586517A (en) 1944-04-20 1944-04-20 Improvements in or relating to the protective surface treatment of zinc, zinc coated and zinc alloy articles

Country Status (1)

Country Link
GB (1) GB586517A (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2681873A (en) * 1954-02-25 1954-06-22 George L Deniston Production of black oxide films on aluminum
US2768103A (en) * 1952-03-18 1956-10-23 Heintz Mfg Co Method for coating metals
US2777785A (en) * 1953-07-30 1957-01-15 Heintz Mfg Co Composition for and method of treating metals as well as the treated product
US2796372A (en) * 1953-05-07 1957-06-18 Poor & Co Corrosion protecting metal finishing composition
US2902394A (en) * 1956-07-19 1959-09-01 Poor & Co Protective metal coating compositions and method of coating
US3039900A (en) * 1959-04-01 1962-06-19 Cornigliano Societa Per Azioni Method to form a film for protection against corrosion on sheets of galvanized steel
US4171231A (en) * 1978-04-27 1979-10-16 R. O. Hull & Company, Inc. Coating solutions of trivalent chromium for coating zinc surfaces
DE3213384A1 (en) * 1981-04-16 1982-12-09 Hooker Chemicals & Plastics Corp., 48089 Warren, Mich. AQUEOUS ACID SOLUTION AND METHOD FOR THE TREATMENT OF RECEIVABLE METAL SUBSTRATES FOR THE AWARD OF A PASSIVATION FILM
US5393354A (en) * 1993-10-07 1995-02-28 Mcgean-Rohco, Inc. Iridescent chromium coatings and method
US5393353A (en) * 1993-09-16 1995-02-28 Mcgean-Rohco, Inc. Chromium-free black zinc-nickel alloy surfaces
US5415702A (en) * 1993-09-02 1995-05-16 Mcgean-Rohco, Inc. Black chromium-containing conversion coatings on zinc-nickel and zinc-iron alloys
US5876517A (en) * 1994-12-07 1999-03-02 Atotech Deutschland Gmbh Chromate-plating bath and process for finishing zinc zinc alloy or cadmium surfaces
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 (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2768103A (en) * 1952-03-18 1956-10-23 Heintz Mfg Co Method for coating metals
US2796372A (en) * 1953-05-07 1957-06-18 Poor & Co Corrosion protecting metal finishing composition
US2777785A (en) * 1953-07-30 1957-01-15 Heintz Mfg Co Composition for and method of treating metals as well as the treated product
US2681873A (en) * 1954-02-25 1954-06-22 George L Deniston Production of black oxide films on aluminum
US2902394A (en) * 1956-07-19 1959-09-01 Poor & Co Protective metal coating compositions and method of coating
US3039900A (en) * 1959-04-01 1962-06-19 Cornigliano Societa Per Azioni Method to form a film for protection against corrosion on sheets of galvanized steel
US4171231A (en) * 1978-04-27 1979-10-16 R. O. Hull & Company, Inc. Coating solutions of trivalent chromium for coating zinc surfaces
DE3213384A1 (en) * 1981-04-16 1982-12-09 Hooker Chemicals & Plastics Corp., 48089 Warren, Mich. AQUEOUS ACID SOLUTION AND METHOD FOR THE TREATMENT OF RECEIVABLE METAL SUBSTRATES FOR THE AWARD OF A PASSIVATION FILM
US5415702A (en) * 1993-09-02 1995-05-16 Mcgean-Rohco, Inc. Black chromium-containing conversion coatings on zinc-nickel and zinc-iron alloys
US5393353A (en) * 1993-09-16 1995-02-28 Mcgean-Rohco, Inc. Chromium-free black zinc-nickel alloy surfaces
US5393354A (en) * 1993-10-07 1995-02-28 Mcgean-Rohco, Inc. Iridescent chromium coatings and method
US5407749A (en) * 1993-10-07 1995-04-18 Mcgean-Rohco, Inc. Iridescent chromium coatings and method
US5876517A (en) * 1994-12-07 1999-03-02 Atotech Deutschland Gmbh Chromate-plating bath and process for finishing zinc zinc alloy or cadmium surfaces
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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