US1523741A - Method of rust removal and prevention - Google Patents

Method of rust removal and prevention Download PDF

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Publication number
US1523741A
US1523741A US591095A US59109522A US1523741A US 1523741 A US1523741 A US 1523741A US 591095 A US591095 A US 591095A US 59109522 A US59109522 A US 59109522A US 1523741 A US1523741 A US 1523741A
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US
United States
Prior art keywords
solution
prevention
subjecting
rust removal
ammonium citrate
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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 - Lifetime
Application number
US591095A
Inventor
Yonkman William
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AT&T Corp
Original Assignee
Western Electric Co Inc
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 Western Electric Co Inc filed Critical Western Electric Co Inc
Priority to US591095A priority Critical patent/US1523741A/en
Application granted granted Critical
Publication of US1523741A publication Critical patent/US1523741A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C23C22/78—Pretreatment of the material to be coated

Definitions

  • This invention relates to a process for removing rust from the surface of iron and preventing the subsequent rusting of the said surfaces.
  • An object of the invention is to provide a method for this purpose of such character that in its practice the surface of the metal will not be attacked.
  • the invention consists in subjecting the rustedpart, as for instance by immersion in a bath, to a solution of ammonium citrate. It has been found in practice preferable to maintain the bath between 175 and 212? Fahrenheit and to retain the parts therein for a period of from 3 to 15 minutes, the
  • Ammonium citrate will dissolve all of the iron oxide (rust) on the parts without attacking the surface of the metal. This feature is especially important where it is desirable that the dimension of the parts after cleaning be approximately identical with their dimensions prior thereto.
  • the parts are next removed from the ammonium citrate bath and washed in water to remove the ammonium citrate. It has been found preferable to wash the parts by immersing them in water heated at approximately 175 or higher, retaining the parts in the water a time sufiicient to heat them, whereby upon removal from the water they will dry rapidly.
  • the hot parts are then subjected, as for instance by dipping in a bath, to a soluble chromate solution such as sodium chromate or sodium bichromate. These materials act as rust inhibitors. and do not attack the surface of the metal.
  • a soluble chromate solution such as sodium chromate or sodium bichromate.
  • the chromate solution may be kept at room temperature since the submersion of the heated parts is for so short a time that they are not sufliciently cooled to prevent rapid drying after removal.
  • rusting after the parts have dried following their treatment in the chromate bath, they are finally coated with a waterproof oil such as a mixture vof Vaseline .and benzine. or vaseline and kerosene.
  • a waterproof oil such as a mixture vof Vaseline .and benzine. or vaseline and kerosene.
  • a method of rust removal and pre-' vention consisting in subjecting the rusted surface first to a solution of ammonium citrate and then to a soluble chromate solution.
  • a method of rust removal and prevention consisting in subjecting the rusted surface to a hot solution of ammonium citrate and then to a soluble chromate solution.
  • a method of rust removal and prevention consisting in subjecting the rusted surface first to a solution of ammonium citrate and-then to a solution of sodium chromate.
  • a method of rust removal and prevention consisting in subjecting the rusted surface first to a solution of ammonium citrate maintained at a minimum temperature of approximately 175 Fahrenheit and then sub ecting the said surface to a soluble chromate solution.
  • a method of rust removal and prevention consisting in' subjecting the rusted surface to a solution'of ammonium citrate, then washing said surface with water to remove the ammonium citrate, and finally subjecting the said surface to a soluble chromate solution.
  • a method of rust removal and prevention consisting in subjecting the rusted surface to a solution ofammonium citrate then subjecting the surface to a solution of sodium chromate, drying the surface and finallycoating it with a waterproof oil.
  • a method of rust removal and prevention consisting in subjecting the rusted.
  • a method of rust removal and prevention consisting in subjectin the rusted washing the surface with water to remove .surface to a solutlon of ammo ium citrate,
  • a method of rust removal and prevention consisting in subjecting the rusted surface first to a solution of ammonium citrate and then to a soluble bi-chromate solution.
  • a method of rust removal and prevention consisting in subjecting the rusted surface first to a solution of ammonium citrate maintained at a minimum temperature of approximately 175 Fahrenheit, then washing said surface with water heated to a minimum temperature of approximately 17 5 Fahrenheit to remove the ammonium citrate and finally subjecting the said surface to a soluble chromate solution.

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  • 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)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)

Description

' steel an No Drawing.
Patented 20, 1925.
WILLIAM YONKMAN, OF CHICAGO, ILLINOIS, ASSIGNOR TO WESTERN ELECTRIC COM- PANY, INCORPORATED, OE NEW YORK, N. Y., A. CORPORATION OF NEW YORK.
Mn'rnon or RUST REMOVAL-AND rnEvniI'noN.
Removal and Prevention, of which the following is a full, clear, concise, and exact description.
This invention relates to a process for removing rust from the surface of iron and preventing the subsequent rusting of the said surfaces.
An object of the invention is to provide a method for this purpose of such character that in its practice the surface of the metal will not be attacked.
The invention consists in subjecting the rustedpart, as for instance by immersion in a bath, to a solution of ammonium citrate. It has been found in practice preferable to maintain the bath between 175 and 212? Fahrenheit and to retain the parts therein for a period of from 3 to 15 minutes, the
'period of immersion, however varying with the amount of rust to be removed.
Ammonium citrate will dissolve all of the iron oxide (rust) on the parts without attacking the surface of the metal. This feature is especially important where it is desirable that the dimension of the parts after cleaning be approximately identical with their dimensions prior thereto.
The parts are next removed from the ammonium citrate bath and washed in water to remove the ammonium citrate. It has been found preferable to wash the parts by immersing them in water heated at approximately 175 or higher, retaining the parts in the water a time sufiicient to heat them, whereby upon removal from the water they will dry rapidly.
The hot parts are then subjected, as for instance by dipping in a bath, to a soluble chromate solution such as sodium chromate or sodium bichromate. These materials act as rust inhibitors. and do not attack the surface of the metal.
The chromate solution may be kept at room temperature since the submersion of the heated parts is for so short a time that they are not sufliciently cooled to prevent rapid drying after removal.
To further insure against subsequent Application filed September 28, 1922. Serial No. 391,095.
rusting, after the parts have dried following their treatment in the chromate bath, they are finally coated with a waterproof oil such as a mixture vof Vaseline .and benzine. or vaseline and kerosene.
What'is claimed is:
1. A method of rust removal and pre-' vention, consisting in subjecting the rusted surface first to a solution of ammonium citrate and then to a soluble chromate solution.
2. A method of rust removal and prevention, consisting in subjecting the rusted surface to a hot solution of ammonium citrate and then to a soluble chromate solution.
3. A method of rust removal and prevention, consisting in subjecting the rusted surface first to a solution of ammonium citrate and-then to a solution of sodium chromate.
4. A method of rust removal and prevention, consisting in subjecting the rusted surface first to a solution of ammonium citrate maintained at a minimum temperature of approximately 175 Fahrenheit and then sub ecting the said surface to a soluble chromate solution.
5. A method of rust removal and prevention, consisting in' subjecting the rusted surface to a solution'of ammonium citrate, then washing said surface with water to remove the ammonium citrate, and finally subjecting the said surface to a soluble chromate solution.
6. A method of rust removal and prevention, consisting in subjecting the rusted surface to a solution ofammonium citrate then subjecting the surface to a solution of sodium chromate, drying the surface and finallycoating it with a waterproof oil.
7'. A method of rust removal and prevention, consisting in subjecting the rusted.
surface to a solution of ammonium citrate, washing the surface with water to remove the ammonium citrate, then subjecting the surface to a solution of sodium chromate, drying the surface, and finally coating it with a waterproof oil.' 8. A method of rust removal and prevention, consisting in subjectin the rusted washing the surface with water to remove .surface to a solutlon of ammo ium citrate,
the ammonium citrate,then subjecting the j surface to a solution of sodium chromate, drying the surface, and finally coating it with a hydrocarbon oil. I
9. A method of rust removal and prevention, consisting in subjecting the rusted surface first to a solution of ammonium citrate and then to a soluble bi-chromate solution.
10. A method of rust removal and prevention, consisting in subjecting the rusted surface first to a solution of ammonium citrate maintained at a minimum temperature of approximately 175 Fahrenheit, then washing said surface with water heated to a minimum temperature of approximately 17 5 Fahrenheit to remove the ammonium citrate and finally subjecting the said surface to a soluble chromate solution.
In witness whereof, I hereunto subscribe 20 WILLIAM YONKMAN.
US591095A 1922-09-28 1922-09-28 Method of rust removal and prevention Expired - Lifetime US1523741A (en)

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US1523741A true US1523741A (en) 1925-01-20

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2947703A (en) * 1958-07-16 1960-08-02 Nalco Chemical Co Process of inhibiting corrosion of ferrous metals in contact with aqueous solutions of acids
US2964165A (en) * 1956-11-13 1960-12-13 Chempel Inc Corrosion resistant aerosol package containing hydrolyzable material
US3242093A (en) * 1963-10-07 1966-03-22 Miles Lab Composition for removing surface oxidation from metal surfaces
US3308065A (en) * 1963-07-22 1967-03-07 Dow Chemical Co Scale removal, ferrous metal passivation and compositions therefor
US3719534A (en) * 1966-04-05 1973-03-06 Ass Chem Co Anti-corrosive coating compositions
USRE30796E (en) * 1962-07-23 1981-11-17 The Dow Chemical Co. Scale removal, ferrous metal passivation and compositions therefor

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2964165A (en) * 1956-11-13 1960-12-13 Chempel Inc Corrosion resistant aerosol package containing hydrolyzable material
US2947703A (en) * 1958-07-16 1960-08-02 Nalco Chemical Co Process of inhibiting corrosion of ferrous metals in contact with aqueous solutions of acids
USRE30796E (en) * 1962-07-23 1981-11-17 The Dow Chemical Co. Scale removal, ferrous metal passivation and compositions therefor
US3308065A (en) * 1963-07-22 1967-03-07 Dow Chemical Co Scale removal, ferrous metal passivation and compositions therefor
US3242093A (en) * 1963-10-07 1966-03-22 Miles Lab Composition for removing surface oxidation from metal surfaces
US3719534A (en) * 1966-04-05 1973-03-06 Ass Chem Co Anti-corrosive coating compositions

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