US1798391A - Process of and apparatus for electroplating hollow parts - Google Patents

Process of and apparatus for electroplating hollow parts Download PDF

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Publication number
US1798391A
US1798391A US327264A US32726428A US1798391A US 1798391 A US1798391 A US 1798391A US 327264 A US327264 A US 327264A US 32726428 A US32726428 A US 32726428A US 1798391 A US1798391 A US 1798391A
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bar
shape
hollow
metal
electroplating
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US327264A
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English (en)
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Wurth Ernst
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/04—Tubes; Rings; Hollow bodies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S204/00—Chemistry: electrical and wave energy
    • Y10S204/07—Current distribution within the bath

Definitions

  • PROCESS OF AND APPARATUS FOR ELECTROPLATING HOLLOW PROCESS OF AND APPARATUS FOR ELECTROPLATING HOLLOW. PARTS Filed Dec. 20, 1928 Patented Mar. 31, 1931 PATENT ormcs ERNST WTTR'I'H, OF GOPPINGE'K GERMANY PROCESS OF AND APPARATUS FOR ELECTROPLA'IING HOLLOW ZPARTS Applicathnfiled December 20, 1928, Serial No. 327,264, and in Germany August 5, 1927.
  • My invention relates to the art of electro-- plating hollow shapes and more especially bars and the like of U-, C- or similar cross section. It is an object of my invention to eliminate certain difficulties encountered in the process of electroplating such parts.
  • I insert in the hollow shape to be treated a piece or strip of the metal to be deposited in such position that it partly pro- 1 jects into the hollow and partly projects therefrom.
  • I then immerse the bar with the strip therein in a cell containing an'ele'ctrolyte in which an anode or a plurality of anodes is arranged, and connect the bar as the cathode.
  • the solution pressure within the practically closed bar has the tendency to overcome the solution pressure of the electrolyte, and if'this occurs, the metal of the bar enters into solution, contaminating the electrolyte and, under certain conditions, rendering it altogether unserviceable.
  • the bar is connected as the cathode and placed in the cell with its slot up, and a strip of the metal to be electrodeposited is inserted in the slot by means of insulating spacing blocks so that the strip partly extends into the section of the bar and partly into the electrol te outside the bar.
  • the bar is arrange intermediate normal anodes and preferably the strip extends in parallel to such anodes.
  • the metal strip then acts as a bipolar element, the surface projecting beyond the bar becoming the cathode and the surface within the bar the anode. This results in the deposition of a layer on the inside of the bar which is much thicker and much more uniform than a layer obtained by mere dispersion through the slot.
  • Fig. 1 is a transverse section on the line I I in Fig. 2,
  • Fig. 2 is a longitudinal section on the line IIII in Fig. l viewed from the right,
  • Figs. 3 and 4 are sections of the bar illustrating the reversing of the metal strip to make up for its change of cross-section.
  • 2' is a cell containing an electrolyte
  • a is the cathode bar
  • Z) is a bracket suspended from the bar
  • 0 is the hollow bar of C-shaped cross-section secured on the bracket with its slotted side up
  • e is a strip of the metal to be deposited
  • f, f are wedge shaped spacing blocks of insulating material, such as ebonite or the like
  • d, d are the anodes which are suspended from suitable anode bars 7c
  • the strip 6 is secured in the bar a by means of the wedges 7 so that its upper part 9 projects into the electrolyte and its lower part it intothe bar.
  • This effect is to a certain extent a function of the voltage in the anodes d. If it is desirable to start the process ata highervoltage this is readily effected by connecting the strip e for a short time as the anode and breaking this connection later on.
  • the strip is now reversed as shown in Fig. 4 and in this manner is fully utilized before it becomes necessary to remelt or to reroll it.
  • the strip is reversed when a fresh bar 0 is inserted.
  • my invention is not limited to bars having the channel section illustrated but may be used for electroplating bars and other shapes of any section and origin, such as rolled sections, die-cast sections and the like.
  • I claim 1 The method of electroplating hollow longitudinally slotted shapes comprising immersing such shape in an electrolytic cell comprising an anode, connecting said part as the cathode, and securing in the slot of the shape, but out of electrical contact with same a piece of the metal to be deposited in such manner that such piece partly projects into the hollow of said shape and partly into said cell outside of said shape.
  • the method of electroplating hollow slotted shapes comprising immersing such shape in an electrolytic cell comprising an anode, connecting said part as the cathode, securing in the slot of the shape, but out of electrical contact with same a piece of the metal to be deposited in such manner that such piece partly projects into the hollow of said shape and partly into said cell outside of said shape, and reversing the position of said metal piece, after its outer portion has increased in thickness, so that the thicker part now extends into the hollow of said shape.
  • An electrolytic apparatus for depositing metal comprising a'cell, an anode and a hollow longitudinally slotted shape in said cell, and a piece of the metal to be deposited inserted in the slot of said shape but out of electrical contact with same so that it partly projects into the hollow of said shape and partly into said cell.
  • An electrolytic apparatus for depositing metal comprising a cell, an anode and a hollow slotted shape in said cell, a spacer of insulating material inserted in the slot of said shape, and a piece of the metal to be deposited held by said spacer so that it partly projects into the hollow of said shape and partly into said cell.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electroplating Methods And Accessories (AREA)
US327264A 1927-08-05 1928-12-20 Process of and apparatus for electroplating hollow parts Expired - Lifetime US1798391A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1798391X 1927-08-05

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US1798391A true US1798391A (en) 1931-03-31

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US327264A Expired - Lifetime US1798391A (en) 1927-08-05 1928-12-20 Process of and apparatus for electroplating hollow parts

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US (1) US1798391A (fr)
FR (1) FR784574A (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3014851A (en) * 1959-06-05 1961-12-26 Savage Plating & Anodizing Co Process for plating a selective surface within a groove
US3226308A (en) * 1961-06-15 1965-12-28 Clevite Corp Electrochemical treating method and apparatus
US3988216A (en) * 1975-10-15 1976-10-26 National Steel Corporation Method of producing metal strip having a galvanized coating on one side while preventing the formation of a zinc deposit on cathode means
US3989604A (en) * 1975-10-15 1976-11-02 National Steel Corporation Method of producing metal strip having a galvanized coating on one side
US4950375A (en) * 1989-05-26 1990-08-21 United Technologies Corporation Die for electroforming a part
US5256262A (en) * 1992-05-08 1993-10-26 Blomsterberg Karl Ingemar System and method for electrolytic deburring

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3014851A (en) * 1959-06-05 1961-12-26 Savage Plating & Anodizing Co Process for plating a selective surface within a groove
US3226308A (en) * 1961-06-15 1965-12-28 Clevite Corp Electrochemical treating method and apparatus
US3988216A (en) * 1975-10-15 1976-10-26 National Steel Corporation Method of producing metal strip having a galvanized coating on one side while preventing the formation of a zinc deposit on cathode means
US3989604A (en) * 1975-10-15 1976-11-02 National Steel Corporation Method of producing metal strip having a galvanized coating on one side
US4950375A (en) * 1989-05-26 1990-08-21 United Technologies Corporation Die for electroforming a part
US5256262A (en) * 1992-05-08 1993-10-26 Blomsterberg Karl Ingemar System and method for electrolytic deburring
WO1994029061A1 (fr) * 1992-05-08 1994-12-22 Debur Corporation Systeme et procede d'ebavurage electrolytique

Also Published As

Publication number Publication date
FR784574A (fr) 1935-07-22

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