GB538210A - Improvements in or relating to the imparting of color finish to iron and steel articles - Google Patents

Improvements in or relating to the imparting of color finish to iron and steel articles

Info

Publication number
GB538210A
GB538210A GB395440A GB395440A GB538210A GB 538210 A GB538210 A GB 538210A GB 395440 A GB395440 A GB 395440A GB 395440 A GB395440 A GB 395440A GB 538210 A GB538210 A GB 538210A
Authority
GB
United Kingdom
Prior art keywords
stage
iron
imparting
relating
articles
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
GB395440A
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.)
Heatbath Corp
Original Assignee
Heatbath Corp
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 Heatbath Corp filed Critical Heatbath Corp
Priority to GB395440A priority Critical patent/GB538210A/en
Publication of GB538210A publication Critical patent/GB538210A/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

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

538,210. Coating iron and steel. STEVENS, A. H. (Heatbath Corporation). March 2, 1940, No. 3954. [A Specification was laid open to ,inspection under Sect. 91 of the Acts, Nov. 18, 1940.] [Class 82 (ii)] The surfaces of ferrous metal articles are oxidized by immersing the articles in a solution of sodium or potassium nitrate and hydroxide in the proportion of one part of nitrate to two of hydroxide, the treatment being conducted in successive stages. The concentration of the salts in the first stage is such that the solution boils at a temperature from 20‹ F. to 25‹ F. lower than in the second stage, the boiling points in the stages being kept constant by dilution. The boiling point in the first stage is about 285 ‹F. and in the second stage about 310‹ F.
GB395440A 1940-03-02 1940-03-02 Improvements in or relating to the imparting of color finish to iron and steel articles Expired GB538210A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB395440A GB538210A (en) 1940-03-02 1940-03-02 Improvements in or relating to the imparting of color finish to iron and steel articles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB395440A GB538210A (en) 1940-03-02 1940-03-02 Improvements in or relating to the imparting of color finish to iron and steel articles

Publications (1)

Publication Number Publication Date
GB538210A true GB538210A (en) 1941-07-24

Family

ID=9768011

Family Applications (1)

Application Number Title Priority Date Filing Date
GB395440A Expired GB538210A (en) 1940-03-02 1940-03-02 Improvements in or relating to the imparting of color finish to iron and steel articles

Country Status (1)

Country Link
GB (1) GB538210A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0447008A1 (en) * 1990-02-16 1991-09-18 Zwez Chemie Gmbh Use of blackening bath sludge

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0447008A1 (en) * 1990-02-16 1991-09-18 Zwez Chemie Gmbh Use of blackening bath sludge

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