US2294227A - Method of electrolytically polishing steel - Google Patents

Method of electrolytically polishing steel Download PDF

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Publication number
US2294227A
US2294227A US250236A US25023639A US2294227A US 2294227 A US2294227 A US 2294227A US 250236 A US250236 A US 250236A US 25023639 A US25023639 A US 25023639A US 2294227 A US2294227 A US 2294227A
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United States
Prior art keywords
solution
present
polishing
instance
steel
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Expired - Lifetime
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US250236A
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English (en)
Inventor
Delaplace Rene Paul
Bechard Charles Leon
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Brev Aero Mecaniques S A Soc
BREVETS AERO-MECANIQUES S A Ste
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Brev Aero Mecaniques S A Soc
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F3/00—Electrolytic etching or polishing
    • C25F3/16—Polishing
    • C25F3/22—Polishing of heavy metals
    • C25F3/24—Polishing of heavy metals of iron or steel

Definitions

  • the present invention relates to methods of electrolytically polishing metals or alloys, and more especially steel, which methods are of the type in which use is made, for levelling the metal striae, of an electrolysis action in a suitable bath containing said metal which constitutes the anode (anodic polishing).
  • the chief object of the present invention is to provide a method of this type which is better adapted to meet the requirements of practice than the methods used up to this time, and especially to improve the efficiency and rapidity of action of the method.
  • Another object of the invention is to provide a device for carrying out this method.
  • a non-aqueous solution that is to say a solution obtained by means of a solvent which is not water, in particular an organic solvent.
  • Alcohol is particularly advantageous in the case where pyrophosphoric acid is used because it helps in keeping it stable.
  • Fig. l diagrammatically shows a device for the anodic polishing of a piece of steel (in this example a roller axis) according to the method of the present invention, said device being made according to the present invention;
  • IFig. 2 shows, also diagrammatcally, but partly, a device of the same kind for the anodic polishing of a roller according to the process of the invention, this device being made according to the invention;
  • Fig. 3 is a diagrammatic view of the operation of the invention.
  • 'Ihe invention is intended for the anodic polishing of a piece of a metal or of a metallic alloy
  • a view to eliminating the very minute projections which can not be removed through mechanical methods grinding unavoidably produces striae, whereas burnishing, for instance lead burnishing, only temporarily closes these striae
  • the invention is based upon the idea that it is advantageous to increase as much as possible the resistance ⁇ of this layer a, with a view to making as high as possible the elliciency of the electrolytic attack of the metal and to accelerate the action tending to level up the striae.
  • This action seems to be determined by the, fact that the ratio of the resistances to the flow of the current respectively opposite the projections and the hollows, that is to say:
  • our object is to accelerate this levelling and to make it more leilicient, according to the invention, by increasing the resistance of layer q, and this in such manner that, owing to a suitable choice of the electrolyte, said layer tends to be constituted during the electrolytic operation, by a complex salt, that is to say a salt which is a bad conductor of electricity.
  • oxalic acid potassium oxalate, perchloric acid, polyphosphoric acid, and so on: it being well understood that the solution that is considered is nonaqueous, the solvent being organic andpreferably alcohol.
  • the anhydride is added as quickly as it is possible in view of the violent heating of the solution, in such manner as to obtain a viscous solution which contains a mixture of orthophosphoric, pyrophosphoric, and polyphosphoric acid.
  • this pyrophosphoric acid is incorporated with a solvent such as alcohol, in such manner as to obtain a stable solution.
  • this solution will be concentrated, for instance at the rate of 400 grams of pyrophosphoric acid per liter.
  • this vessel may a good conductor of heat.
  • This value in the case of the pyrophosphate solution above referred to, is about 30 amperes perv square decimeter.
  • the polishing effect may be temporarily stopped ⁇ I by the phenomenon known as passivation of steel. This phenomenon can easily be stopped by contact with a copper rod kept in a very clean state, or by a mechanical system capable of automatically producing, from time to time, or when necessary, such a contact.
  • said piece is suspended in vessel by means of a steel piece 3, which constitutes the electrode support 3, the whole being arranged in such manner that the current distribution over the surface to be polished is as uniform as possible.
  • the piece to be polished consists of a roller 4, the latter being, for instance placed upon an iron tripod 5.
  • Thecathode can be prolonged by a rod 6 which is placed at the center of the roller.
  • the current inlet to the anode it can take place by mere contact of an electrode 3 which may pass across an external glass tube 1.
  • the polishing op'- eration is performed in a period of time of about ten minutes. Then the piece is removed as rapidly as possib1e,and it is then immersed in an acid solution, so vas to dissolve the traces of ferrie pyrophosphate which may have been carried along by the surface.
  • a solution of pyrophosphoric acid in alcohol for instance, the polishing op'- eration is performed in a period of time of about ten minutes. Then the piece is removed as rapidly as possib1e,and it is then immersed in an acid solution, so vas to dissolve the traces of ferrie pyrophosphate which may have been carried along by the surface.
  • What we V A method oi' anodic polishing of a steel body which comprises, arranging the steel body as an anode in an electrolytic bath entially consisting of pyrophosphoric acid in on-aqucous solution in a solvent capable of assuring the stability of the acid during the course o! the lishing operation, and passing an electric currentthrough said bath.
  • the solvent being alcohol
  • the concentration of the solution being 400 g. of
US250236A 1938-02-10 1939-01-10 Method of electrolytically polishing steel Expired - Lifetime US2294227A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE209170X 1938-02-10

Publications (1)

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US2294227A true US2294227A (en) 1942-08-25

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US250236A Expired - Lifetime US2294227A (en) 1938-02-10 1939-01-10 Method of electrolytically polishing steel

Country Status (6)

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US (1) US2294227A (xx)
BE (1) BE426294A (xx)
CH (1) CH209170A (xx)
DE (1) DE686131C (xx)
FR (1) FR850135A (xx)
GB (1) GB524272A (xx)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2424674A (en) * 1940-04-29 1947-07-29 American Rolling Mill Co Electrolytic bright polishing
US2428141A (en) * 1940-09-25 1947-09-30 Gen Motors Corp Process for cleaning, stripping, and polishing metal surfaces
US2461035A (en) * 1944-02-23 1949-02-08 Armco Steel Corp Electrolytic stainless steel polishing
US2534389A (en) * 1943-03-15 1950-12-19 Hartford Nat Bank & Trust Co Voltage stabilizing tube
US2549737A (en) * 1946-07-19 1951-04-17 Conn Ltd C G Method of electropolishing
US2645635A (en) * 1949-06-27 1953-07-14 Shwayder Bros Inc Method of regenerating electrolytic polishing solutions
US3073764A (en) * 1960-04-13 1963-01-15 Bell Telephone Labor Inc Process for electropolishing semiconductor surfaces
US3293162A (en) * 1964-06-30 1966-12-20 Bell Telephone Labor Inc Process for electropolishing both sides of a semiconductor simultaneously

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE743258C (de) * 1941-09-10 1943-12-21 Ig Farbenindustrie Ag Elektrolytisches Verfahren zur Erzeugung einer Kupferschicht auf der Oberflaeche von Werkstuecken aus Messing und messingaehnlichen Legierungen aus kupferfreien Loesungen
FR1005928A (fr) * 1947-10-17 1952-04-17 Fr Hispano Suiza Soc Perfectionnements apportés aux procédés de polissage électrolytique et aux bains pour leur mise en oeuvre

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2424674A (en) * 1940-04-29 1947-07-29 American Rolling Mill Co Electrolytic bright polishing
US2428141A (en) * 1940-09-25 1947-09-30 Gen Motors Corp Process for cleaning, stripping, and polishing metal surfaces
US2534389A (en) * 1943-03-15 1950-12-19 Hartford Nat Bank & Trust Co Voltage stabilizing tube
US2461035A (en) * 1944-02-23 1949-02-08 Armco Steel Corp Electrolytic stainless steel polishing
US2549737A (en) * 1946-07-19 1951-04-17 Conn Ltd C G Method of electropolishing
US2645635A (en) * 1949-06-27 1953-07-14 Shwayder Bros Inc Method of regenerating electrolytic polishing solutions
US3073764A (en) * 1960-04-13 1963-01-15 Bell Telephone Labor Inc Process for electropolishing semiconductor surfaces
US3293162A (en) * 1964-06-30 1966-12-20 Bell Telephone Labor Inc Process for electropolishing both sides of a semiconductor simultaneously

Also Published As

Publication number Publication date
DE686131C (de) 1940-01-03
BE426294A (xx)
GB524272A (en) 1940-08-02
CH209170A (fr) 1940-03-31
FR850135A (fr) 1939-12-08

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