US1169397A - Process for the oxidation of smooth iron surfaces. - Google Patents

Process for the oxidation of smooth iron surfaces. Download PDF

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Publication number
US1169397A
US1169397A US2709515A US2709515A US1169397A US 1169397 A US1169397 A US 1169397A US 2709515 A US2709515 A US 2709515A US 2709515 A US2709515 A US 2709515A US 1169397 A US1169397 A US 1169397A
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Prior art keywords
oxidation
sodium
iron
bath
iron surfaces
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Expired - Lifetime
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US2709515A
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Berardo Guerini
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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

Definitions

  • My invention relates to a new method for the superficial oxidation of iron.
  • Object of my invention is to provide speedily and with a simplicity heretofore unknown, to coat iron objects as gun-barrel tools and the like, with the known superficial layer of oxids that renders them dark bright.
  • the process consists in preparing a bath containing salts of picric acid.
  • a tank containing water may be introduced some picric acid and some hydrate of sodium or potassium.
  • the rate of such com-' ponents may vary at pleasure, nevertheless for sake of economy may be proceeded as follows:
  • 100 parts of water, 8% parts of hydrate of sodium, 16 parts of picric acid the solution thus formed will contain picrate of sodium and will have a basic reaction.
  • the iron or steel objects While heating is appliedgradually to raise the temperature of the bath to say 130- 150 C. If the iron objects are conveniently smoothed and cleaned, 10 minutes will be sufiicient to obtain the result claimed.
  • a process for oxidation of iron surfaces consisting in the immersion of iron objects in a bath containin sodium picrate and an excess of hydrate 0 sodium.
  • a process of effecting the surface oxidation of iron or steel consisting in immersing the articles to be treated in a bath containing a, solution of an alkaline picrate and gradually raising the temperature of the bath while the articles are exposed to the action of the same. 4
  • a process for effecting the surface oxidation of iron or steel consisting in immersing the articles to be treated in a bath containing a solution of an alkaline picrate with alkali in excess and gradually raising the temperature of the bath while the articles are exposed to the action of the same.

Description

BERARDO GUERINI, OF BBESCIA, ITALY.
rib,
PROCESS FOR THE OXIDATION OF SMOOTH IRON SURFACES.
No Drawing.
have invented certain new and useful Im-.
provements in Processes for the Oxidation of Smooth Iron Surfaces, of which the fol lowing is a specification.
My invention relates to a new method for the superficial oxidation of iron.
Object of my invention is to provide speedily and with a simplicity heretofore unknown, to coat iron objects as gun-barrel tools and the like, with the known superficial layer of oxids that renders them dark bright.
The process consists in preparing a bath containing salts of picric acid. To this end, in a tank containing water, may be introduced some picric acid and some hydrate of sodium or potassium. The rate of such com-' ponents may vary at pleasure, nevertheless for sake of economy may be proceeded as follows: In a suitable tank are admitted 100 parts of water, 8% parts of hydrate of sodium, 16 parts of picric acid, the solution thus formed will contain picrate of sodium and will have a basic reaction. In this solution are dipped the iron or steel objects, while heating is appliedgradually to raise the temperature of the bath to say 130- 150 C. If the iron objects are conveniently smoothed and cleaned, 10 minutes will be sufiicient to obtain the result claimed. The hydrate of sodium contained in the bath Specification of Letters Patent.
Patented an. 25, 1916.
Application filed May 10, 1915. Serial No. 27,095.
forms by reaction with the picric acid in aqueous solution picrate of sodium; the hydrate of sodium being present in excess, by the actionof heat there is developed by reaction between the hydrate of sodium and the picrate of sodium the oxidizing agent which effects superficial oxidation of iron articles dipped in the bath.
Having now particularly described the nature of my invention and in what manner the same should be performed, I claim:
1. A process for oxidation of iron surfaces consisting in the immersion of iron objects in a bath containin sodium picrate and an excess of hydrate 0 sodium.
*2. A process of effecting the surface oxidation of iron or steel consisting in immersing the articles to be treated in a bath containing a, solution of an alkaline picrate and gradually raising the temperature of the bath while the articles are exposed to the action of the same. 4
2. A process for effecting the surface oxidation of iron or steel consisting in immersing the articles to be treated in a bath containing a solution of an alkaline picrate with alkali in excess and gradually raising the temperature of the bath while the articles are exposed to the action of the same.
' In testimony whereof I have'aflixedmy signature in the presence of two witnesses.
Witness LYLE Bone.
US2709515A 1915-05-10 1915-05-10 Process for the oxidation of smooth iron surfaces. Expired - Lifetime US1169397A (en)

Priority Applications (1)

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US2709515A US1169397A (en) 1915-05-10 1915-05-10 Process for the oxidation of smooth iron surfaces.

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US2709515A US1169397A (en) 1915-05-10 1915-05-10 Process for the oxidation of smooth iron surfaces.

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US1169397A true US1169397A (en) 1916-01-25

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US2709515A Expired - Lifetime US1169397A (en) 1915-05-10 1915-05-10 Process for the oxidation of smooth iron surfaces.

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2828959A (en) * 1953-02-25 1958-04-01 Hans Sickinger Spring shackles

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2828959A (en) * 1953-02-25 1958-04-01 Hans Sickinger Spring shackles

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