GB762104A - Corrosion protecting metal finishing composition - Google Patents

Corrosion protecting metal finishing composition

Info

Publication number
GB762104A
GB762104A GB26741/53A GB2674153A GB762104A GB 762104 A GB762104 A GB 762104A GB 26741/53 A GB26741/53 A GB 26741/53A GB 2674153 A GB2674153 A GB 2674153A GB 762104 A GB762104 A GB 762104A
Authority
GB
United Kingdom
Prior art keywords
sodium
soluble
solution
sulphite
sulphate
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
GB26741/53A
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.)
Poor and Co
Original Assignee
Poor and Co
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 Poor and Co filed Critical Poor and Co
Publication of GB762104A publication Critical patent/GB762104A/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)
  • ing And Chemical Polishing (AREA)

Abstract

A dry composition capable of dissolving in an acid aqueous solution to produce a metal-finishing coating composition, comprises 90 parts by weight of a water soluble dichromate (calculated as Na2Cr2 O72H2O), 3-10 parts by weight of a non-hygroscopic, water-soluble, inorganic, metal sulphate (calculated as NA2SO4) and an amount of a water-soluble, non-hygroscopic, inorganic reducing agent, incapable of forming insoluble sulphates in acid solution, sufficient to reduce 0.5-5 per cent of the hexavalent chromium to trivalent chromium in acid solution. A lower aliphatic carboxylic acid salt soluble in aqueous acidic solution may also be present. The preferred components are sodium dichromate, sodium sulphate, sodium sulphite and sodium acetate. Other reducing agents include sodium hydrosulphite, potassium sulphite, thiosulphate and hydrosulphite, ammonium sulphite, thiosulphate and hydrosulphate and sodium peroxide; and instead of sodium acetate, sodium propionate or butyrate may be used. The composition may be dissolved in aqueous solutions of sulphuric, hydrochloric or nitric acids or mixtures thereof and may be used for the treatment of zinc, cadmium and zinc-copper alloy surfaces. Subsequently the surfaces may be treated with aqueous solutions of alkali metal hydroxides, carbonates or silicates; in particular with a solution of an alkali containing sodium, potassium, magnesium or ammonium sulphate with or without dextrose. Specifications 636,954, 680,435 and 762,103 are referred to.
GB26741/53A 1953-03-07 1953-09-29 Corrosion protecting metal finishing composition Expired GB762104A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US762104XA 1953-03-07 1953-03-07

Publications (1)

Publication Number Publication Date
GB762104A true GB762104A (en) 1956-11-21

Family

ID=22130599

Family Applications (1)

Application Number Title Priority Date Filing Date
GB26741/53A Expired GB762104A (en) 1953-03-07 1953-09-29 Corrosion protecting metal finishing composition

Country Status (1)

Country Link
GB (1) GB762104A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1208149B (en) * 1958-12-11 1965-12-30 United States Steel Corp Process for the aftertreatment of a protective film on tin-coated steel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1208149B (en) * 1958-12-11 1965-12-30 United States Steel Corp Process for the aftertreatment of a protective film on tin-coated steel

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