GB392890A - Process of colouration of ferrous metals - Google Patents

Process of colouration of ferrous metals

Info

Publication number
GB392890A
GB392890A GB23223/31A GB2322331A GB392890A GB 392890 A GB392890 A GB 392890A GB 23223/31 A GB23223/31 A GB 23223/31A GB 2322331 A GB2322331 A GB 2322331A GB 392890 A GB392890 A GB 392890A
Authority
GB
United Kingdom
Prior art keywords
oxide
ferrous metals
ferric
colouration
chromates
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
GB23223/31A
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.)
WALDBERG SA
Original Assignee
WALDBERG SA
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 WALDBERG SA filed Critical WALDBERG SA
Publication of GB392890A publication Critical patent/GB392890A/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
    • C23C22/60—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 alkaline aqueous solutions with pH greater than 8
    • C23C22/62—Treatment of iron or alloys based thereon

Abstract

Ferrous metals are coloured by immersion in a hot alkaline solution containing an oxidizing agent, preferably an oxide of a heavy metal, e.g. lead oxide, ferric oxide, or a mixture of the two, the ferric oxide being introduced preferably as ferric hydrate. The use of manganese oxide and of nitrates and chromates is also referred to. The concentration of caustic alkali in the solution should not be less than 50 per cent by weight and the temperature of the bath should be about 130 DEG C.
GB23223/31A 1930-08-19 1931-08-18 Process of colouration of ferrous metals Expired GB392890A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR392890X 1930-08-19

Publications (1)

Publication Number Publication Date
GB392890A true GB392890A (en) 1933-05-25

Family

ID=8896224

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23223/31A Expired GB392890A (en) 1930-08-19 1931-08-18 Process of colouration of ferrous metals

Country Status (1)

Country Link
GB (1) GB392890A (en)

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