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US2970950A - Method and apparatus for the continuous galvanization of the inner surface of tubes - Google Patents

Method and apparatus for the continuous galvanization of the inner surface of tubes Download PDF

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Publication number
US2970950A
US2970950A US787036A US78703659A US2970950A US 2970950 A US2970950 A US 2970950A US 787036 A US787036 A US 787036A US 78703659 A US78703659 A US 78703659A US 2970950 A US2970950 A US 2970950A
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United States
Prior art keywords
tubes
anode
tank
tube
electrolyte
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Expired - Lifetime
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US787036A
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English (en)
Inventor
Bahmann Hans-Joachim
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Benteler Corp
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Benteler Corp
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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
    • Y10S118/00—Coating apparatus
    • Y10S118/10—Pipe and tube inside

Definitions

  • This invention relates to galvanizing, and more specifically to a method and apparatus for the continuous galvanization of the inner surface of tubes.
  • the object of the present invention is to devise a method and apparatus which enable the carrying out of a continuous galvanization of the inner surface of tubes, even when these have a very small internal diameter, for example down to 3 mm., in a run-through process, but at the same time avoid the disadvantages inherent in the known methods and apparatus While also attaining a considerable improvement from an economical point of view.
  • the first contact-maker in the run-through direction is broken and at the same time the second contact-maker arranged at a distance from the first contact-maker is closed, preferably automatically, whereas, as the tube continues to run through, the first contact-maker is closed and the second contact-maker
  • the current feed to the tubes is effected preferably by cathode-connected driving rolls which at the same time effect the movement of the tubes, arranged in substantially horizontal position, over the anode extending along the entire length of the galvanizing plant.
  • the method proposed by the invention can obviously be carried out in such a manner that several rows of tubes are passed simultaneously on anodes arranged preferably side by side and at a distance apart in a substantially horizontal plane through the bath tanks serving for the pretreatment and finishing treatment as well as the galvanizing.
  • An arrangement particularly suitable for carrying out the method according to the invention comprises a plurality of bath tanks connected up in series and filled respectively with treatment liquids for the pretreatment, galvanizing and subsequent treatment of the tubes, at least one anode connected up with contact-makers and extending through all the said tanks, piston-like stoppers mounted on said anode one in front of the tube inlet aperture and one following the outlet aperture of each of said tanks, and of a diameter corresponding approximately to the internal diameter of the tubes to be treated, said stoppers being arranged at a distance apart exceeding the actual length of its associated tanks, and a plurality of rolls serving for transporting and guiding the tubes distributed in the longitudinal direction of the anode.
  • the tubes are guided preferably only in the run-through region of the electrolyte tank by centering elements arranged on the anode and acting as insulation in relation to the tube wall, these elements being provided with through-flow passages extending parallel to the longitudinal axis of the anode.
  • centering elements arranged on the anode and acting as insulation in relation to the tube wall, these elements being provided with through-flow passages extending parallel to the longitudinal axis of the anode.
  • the suction and pumping effect produced by the stoppers is not hampered by the centering elements owing to the provision of through-flow passages in these elements.
  • the through-flow passages effect an advantageous, continuous thorough mixing of the treatment liquid, so that a reduction in strength or a dissociation of the liquid is avoided.
  • both the driving rolls on a roll stand arranged in front of the electrolyte tank and also those of the set of rolls following the electrolyte tank are connected to the cathode circuit, ensures that, while a tube running ahead is still gripped by the driving rolls of the set of rolls following the electrolyte bath, the next, following tube is already switched into the current circuit and consequently subjected to electrolytic treatment.
  • the diameter of the anode is chosen so that under all circumstances there is a sufficient through-flow of electrolyte between the anode and inner wall of the tube and, a sufiiciently high current density. It has been found that, even in the case of tubes with small internal diameters, the stoppers coordinated to the bath tanks suffice for sucking the quantity of electrolyte liquid necessary for ensuring a sufliciently thick deposition. Even in the case of low runthrough speeds the filling volume of the tubes increases to such an extent that sufficient cooling and recuperation of the electrolyte liquid are attained.
  • the method proposed by the invention covers all types of galvanic treatment, such as zinc plating, copper plating, chroming, nickel plating, polishing and so forth.
  • the anode is preferably provided along a considerable part of its length with an electric insulating coating which is interrupted by electricity conducting surface sections in the run-through region of the electrolytetank.
  • a parti ularly practical solution consists in arranging tubular sections composed of electric insulating and electric conductive material fixed in alternating succession on the wireshaped anode in the runthrough region of the electrolyte tank.
  • the electric insulating tubular sections preferably consist of an elastic moldable plastic proof against the electrolyte and are slipped under elastic expansion on to theWire-shaped anode,
  • the electric conductive tubular sections consist of the metal to be deposited on the surface of the tubes and have an internal.
  • tubular sections composed. of. electric insulating and electric con-' ductive materials depends upon the internal diameter of the tubes to be galvanized. and the run-through speedgof;
  • the tubes As a rule the total length of the sections oomposed. of electric conductive material amounts to only aboutj fit to /2 the total length of the anode in the region ofthe electrolyte tank,
  • tubular sections composed of the metal to be electrolytically deposited on the inner wall of.the tubes and slipped on the anode it is possible to effect a continuous regeneration of the electrolyte. that the anode within the electrolyte tank is in'contact with the electrolyte only on a portion of its length through an electricity conductive surface, the hydrogen formation in the electrolyte is reduced in an advantageous manner, An intensive formation of hydrogen would, particularly in the case of tubes with small internal diameter, prevent uniform galvanizing owing tothe formation of bubbles and liberation of hydrogen on the cathode-connected inner wall of the tubes.
  • centering elements are provided preferably at uni-' form'distances apart, which elementsare principallyof cortical shape and are also slipped on to the wire-Shaped anode.
  • Fig. 1 is a longitudinal section through a galvanizing plant
  • Fig. 2 is a longitudinal section through an anode provided with centering means
  • Fig. 3 is a cross section taken on lineIII lIIof Fig. 2;
  • Fig. 4 illustrates a set of driving rolls
  • Fig. 5 shows a contact-maker for the anode current.
  • Fig. 1 shows steel tubes 1 which have an internal diameter of about '3 mm. and are slipped. on a horizontally arranged anode 2.
  • the anode 2 consists, of. a. copper wire 3 which isencased on a considerable part of its length, in an. electric insulating material 4, such as e.g, rubber or plastic.
  • The. anode 2 is stationary, and arranged axially, extendingv through bath tanks, 5, 6, 7 and 8 arranged. one, behind the other, Whereas the copper wire 3 outside the tank 7,. which servesaselectrolyte bath, is providedwiththeelecs' tricinsulating material 4 along its entire lengthwiththe. exception of sections 3 a and 3b, within the electrolyte.
  • tank 7 tubular sections of electric insulating material 4 andv tubular sections 4a of electric conductive material; are slipped on the copper wire 3 of theanodel in alterw nating succession as shown in Fig. 2.
  • the tubular sectionsv of the electric insulating material 4 tightly surrounding the. anode 2 are preferablymade from plasticwith rubber-,- like characteristics which is not attacked bytreatment, liquids and especially the electrolyte.
  • the tubular sec: tions 4g, likewise firmly seated on the copper wire 3, of, the anode 2 consist, in the example illustrated in the drawn ings, of zinc tubesiwhich are made from a 99.9% ,clectrw, lytic zinc.
  • Thelevel of the treatment liquids in the bath tanks.5 to. 8 is maintained, preferably automatically, at a height. which ensures complete flooding of the anode 2 and the wheel.
  • the anode Zis provided; with piston-like stoppers 9a and 9b which, in the examplej. illustrated in thedrawings, are made froma rubber-like, electric insulating plastic which shows no signs of swelling. inthe presence of oil and acids
  • the stoppers 9a and, 9b are also'firmly seatedon the copper wire. 3 and their; greatestcross section corresponds to the internal diameter of the tubes 1 to be treated, so that they bear tightly" against the inner wall of the tubes. The stoppers.
  • the centering cones 10 are arranged between the'tubular sections of the electric insulating material 4 and the tubular sections 4a mountedon the wire 3 of the anode 2.
  • the centering cones haveconcentric radial apertures constructed as through; fl'ow passages 10a for the electrolyte and extending pa a -j lel to the axis of the anode, see Fig. 3.
  • Thecente'ring cones- 10. are preferably arranged at about uniform dis tances apart one behind the other on the copper'wire' 3.
  • the ;copper wire 3 outside the electrqlyte tank ,7 lies exposed merely on the two sections" 3a and 3b at a distance apart, the section 3b being of greater length than the section 3a.
  • the exposed copper wire sections 3:: and 3b are, as can be seen from Fig. 5, limited by holding cones ll of insulating material.
  • the length of the exposed copper wire section 3b is preferably so chosen that tubes of practically any lengths coming into question can be galvanized in a continuous operation.
  • two contact-makers 12a and 12b are provided which are coordinated to the sections 3a and 3b of the copper wire 3 which are not insulated.
  • the contact-makers 12a and 12b are provided with a slot open in upward direction and of a width corresponding substantially to the diameter of the copper wire 3, and are arranged in a roller bed 13 so that they can be lowered in such a'manner that uninterrupted current is always fed to the copper wire 3 of the anode 2 by one of the two contact-makers 12a and 12b.
  • the alternating contact-making can be regulated for example photo-electrically in accordance with the position of a tube to be treated or by a mechanical feeling device.
  • the contact-maker 12b is, in the example illustrated in Fig. 1, arranged to slide to and fro in the run-through direction indicated by the arrow x.
  • the contact-maker 12b can be mounted longitudinally shiftable within the roller bed 13 parallel to the anode 2.
  • the roller bed 13 is provided with a plurality of transport rollers 14 arranged below and transversely to the anode 2 and which run freely. It is, however, also possible to construct the rollers 14 so that at least some of them can be mechanically driven.
  • the rollers 14 are arranged with their periphery at such distance from the anode 2 that the tubes I slipped on to the anode 2 can be moved on the transport rollers 14 substantially coaxially to the anode in the run-through direction indicated by the arrow x.
  • the rollers are preferably provided with a groove conforming approximately to the external diameter of the tubes 1.
  • Roll stands 15 and 16 arranged respectively in front of and following the electrolyte bath 7 each comprise two driving rolls 15a, 15b and 16a, 16b respectively which are driven at the same speed and connected to the cathode circuit.
  • the driving rolls 15a, 15b and 16a, 16b respec- V tively are each adjustable in a vertical plane extending in the run-through direction in such a manner that their relative'spacing can be adapted to the different external diameters of the tubes to be treated.
  • Each of the driving rolls 15a, 15b and 16a, 16b respectively is provided with a groove 15c and 16c, which corresponds approximately to the external peripheryof the tubes to be treated, see Fig. 4.
  • a particularly practical form of construction for the roll stands comprises two cathode-connected rolls, provided for supporting the tubes to be treated and arranged one behind the other at a distance apart, whereas a roll engaging the tubes from above and arranged in the length section located between the two lower rolls is constructed as driving roll.
  • the driving roll can for this purpose be provided with a groove of plastic with transverse ribs.
  • the tank 7 contains electrolyte liquid 17 which, in the example illustrated in the drawings, consists primarily of a zinc sulphate solution.
  • the level of the electrolyte liquid 17 is slightly above a tube inlet aperture 18a provided on the front end of the tank 7 and a tube outlet aperture 18b provided on the rear end of the tank 7.
  • the apertures 18a and 18b can with advantage by provided on their circumference with packing sleeves of flexible material to offer a certain amount of resistance to the flowing out of the electrolyte liquid.
  • Below the tube inlet aperture 18a and the tube outlet aperture 18b collecting troughs 19a and 19b respectively are provided for catching the electrolyte escaping through the end apertures in the tank.
  • a pump (not shown in the drawings) is coordinated to the tank 7 so that a continuous circulation of electrolyte liquid and the maintenance of the necessary level of treatment liquid are ensured.
  • a circulating pump (also not shown in the drawings) is provided for preventing impoverishment in metal, which would detrimentally affect the uniform separation and also heating of the electrolyte liquid to an excessive extent.
  • Loose guide rollers 20 are provided in the tank 7 for supporting and guiding the tubes.
  • the bath tanks 5 and 6 connected up in front of the electrolyte tank 7 as well as the bath tank 8 connected up behind it are of substantially the same construction as the tank 7.
  • Each of these tanks is also provided with a tube inlet aperture 18a on its front side and a tube outlet aperture 18b on its rear side and the anode 2 passes substantially coaxially through these apertures.
  • Collecting troughs 19a and 19b are also arranged on the front and rear sides respectively of these tanks for catching treatment liquid escaping from the particular tank.
  • the tanks 5, 6 and 8 arranged in front of and following the electrolyte tank 7 contain guide rollers 2G for supporting and guiding the tubes 1.
  • the bath tank 5 is filled with a degreasing liquid 21, whereas the tank 6 in front of the tank 7 contains a flushing liquid 22.
  • the last bath tank 8 also contains a flushing liquid 23.
  • a pump is also coordinated to each of the tanks 5, 6 and 8 arranged in front of and following the electrolyte tank 7 for pumping back the treatment liquid caught in the collecting troughs 19a and 19b, and also a circulating pump for continuously circulating the treatment liquid.
  • the pumps are also in this case not shown in the drawings for the sake of clearness.
  • the level of the treatment liquids contained in the bath tanks 5, 6 and 8 is also slightly higher than the tube inlet and outlet apertures 18a and 18b of these tanks.
  • roller bed 24 with transportrollers 25 is connected up behind the galvanizing plant, the transport rollers 25 of this bed arranged transversely to the runthrough direction being all freely rotatable or in part capable of being mechanically driven.
  • the method of operation is as follows:
  • the tubes 1 are slipped one after the other on to the anode 2 in the direction of the arrow x. As the tubes are slipped on,
  • the anode 2 receives current via the contact-maker 12b, whereas the contact-maker 12a is broken.
  • the contact-maker 12a is broken.
  • the rear end of a tube releases the contact-maker 12a, this closes the circuit whereas at the same time the second contact-maker 12b in the run-through direction indicated by the arrow x opens or breaks.
  • the tube 1 can then be transported without hindrance in the run-through direction and is moved on by the transport rollers 14 in the direction of the arrow x. During this movement, the tube is pushed over the stoppers 9a arranged in front of the bath tank 5 and its front end subsequently enters the tube inlet aperture 18a in the tank 5.
  • the tube pretreated in this manner is now' gripped by the driving rolls 15a, 15b of the roll stand 15.
  • the circuit is closed so that the galvanization of the inner surface of the tube can start up.
  • the tube' is fed through the plant at'a runthrough speed which is dependent on the one hand upon :thethickness of the metal coating it is desired to ob tain and on the other hand upon the concentration of the electrolyte and the density ofthe current employed.
  • the tube travels during its run-through movernent through the electrolyte tank 7 over thecentering cones of the anode 2 so that a uniform coating of the metal deposit is obtained on the inner surface of the tube.
  • the electrolyte liquid sucked into'the tube by the stopper 19a is drawn in through the passages 10:; inthe centering H cones 10 until the front end of the tube'reaches the stopper 9b at the outlet aperture 18b of the electrolyte tank 7, by which stopper the electrolyte liquid is pressed towards the rear through the passages 10a in the centering cones 10 and, when the rear end of the tube becomes free, out of the tube;
  • the tube is subsequently gripped by the driving rolls 16a and 16b of the roll'stand 16,
  • a plurality of bath tanks connected up in series and adapted to be filled respectively with treatment liquids for the pre-treatment, electroplating and subsequent treatment of the tubes, each of said tanks having a tube inlet aperture and a tube outlet aperture at least -one anode connected up with contact-makers and extending throughsaid aperture of said tanks, a plurality of v piston-like stoppers mounted on said anode one in front ofdthe tube inlet'apertureand one following the outlet aperture of each of said tanks, and of a diameter corresponding approximately to the internal diameter of the n tubes to betreated, said stoppers'being'arranged at a -distance apart exceeding the actual'length of its assoelated tanks, and a plurality of rolls serving for transporting and guiding the tubes distributed in the'longitudinal directionof the anode.
  • centering elements for guiding the tubes are arranged on the v anode preferably only in the'run-through regionof that trolytetank, and loosely mounted guide rollers are arranged preferably inside'the tanks for supporting the tubes on the remaining portion of the length of the galvanizing plant.
  • Method of electroplating in continuous operation the inner surface of tubes having impermeable walls and internal diameters down to 3 mm., comprising the steps tubular sections composed respectively of electric insulating material and electric conductive material.
  • Apparat s a s set fo rthclaim '3, whereincollecting troughs are arranged under the tube outlet and tube inlet aperturesof each tankfor catchin g treatment liquids escaping through the inlet and outlet apertures.
  • one pump is coordinated to each bath tank tor pumping the treatment liquid out of a collecting trough back into its tank.
  • Apparatus for electroplating the inner surface of metal tubes having impermeable walls in a continuous operation comprising, in combination, a tank having a pair of opposite walls being each formed with an aperture therethrough aligned with each other and having a preselected diameter substantially equal to the diameter of the tubes to be electroplated, said tank being adapted to be filled with electrolyte; combined anode and pumping means extending through said apertures for sucking electrolyte from said tank into the interior of a tube moving through one of said apertures into said tank and for pushing the electrolyte out of the interior of the tube as the tube leaves said tank through the other of said apertures and for connecting the electrolyte in the tube to one pole of an electric current supply during the movement of the tube through the tank; and combined moving and cathode means for moving a plurality of tubes successively through said apertures of said tank and for connecting the tubes during their movement thereof through said tank to the other pole of the current supply, whereby the interior of said tubes will be electroplated as the tubes move through said tank.
  • Apparatus for electroplating the inner surface of metal tubes having impermeable walls in a continuous operation comprising, in combination, a tank having a pair of opposite walls being each formed with an aperi 14.

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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)
US787036A 1958-01-22 1959-01-15 Method and apparatus for the continuous galvanization of the inner surface of tubes Expired - Lifetime US2970950A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB47546A DE1197719B (de) 1958-01-22 1958-01-22 Verfahren und Vorrichtung zum Galvanisieren der Innenoberflaeche von Rohren mit Innendurchmesser ueber etwa 3 mm im Durchlaufverfahren

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Publication Number Publication Date
US2970950A true US2970950A (en) 1961-02-07

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US787036A Expired - Lifetime US2970950A (en) 1958-01-22 1959-01-15 Method and apparatus for the continuous galvanization of the inner surface of tubes

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US (1) US2970950A (xx)
DE (1) DE1197719B (xx)
FR (1) FR1221041A (xx)
GB (1) GB870352A (xx)
NL (2) NL124779C (xx)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3055812A (en) * 1961-01-20 1962-09-25 Nyby Bruk Ab Electrolytic treatment of surfaces
US3208869A (en) * 1961-01-16 1965-09-28 Jones & Laughlin Steel Corp Fluidized coating of pipe
US3429787A (en) * 1963-06-18 1969-02-25 Benteler Werke Ag Process and apparatus for electrolytically treating metal tubes
US3506557A (en) * 1967-02-01 1970-04-14 Allegheny Ludlum Steel Electrochemical machining cell
EP0172661A2 (en) * 1984-07-31 1986-02-26 The Upjohn Company Apparatus for internally electropolishing tubes
US4589367A (en) * 1984-10-01 1986-05-20 Empire Enterprises, Inc. System for automatically painting pencils
US4705611A (en) * 1984-07-31 1987-11-10 The Upjohn Company Method for internally electropolishing tubes
EP0291373A1 (fr) * 1987-05-14 1988-11-17 Framatome Canne tubulaire pour le traitement de la surface intérieure d'un tube
US5176803A (en) * 1992-03-04 1993-01-05 General Electric Company Method for making smooth substrate mandrels
FR2697538A1 (fr) * 1992-11-03 1994-05-06 Pechiney Recherche Electrode pour dépôt électrophorétique.
US5507923A (en) * 1993-11-09 1996-04-16 Stouse; Henry J. Method and apparatus for electrolytic polishing of tubular products
US5595640A (en) * 1994-08-29 1997-01-21 Metallglanz Gesellschaft Fuer Entgratung Und Oberflaechentechnik Mbh Method and apparatus for continuous galvanic application of metallic layers on a body
US5596803A (en) * 1993-10-20 1997-01-28 Pechiney Recherche Electrode for electrophoretic deposition

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114855252A (zh) * 2022-06-24 2022-08-05 中航飞机起落架有限责任公司 一种盲孔镀铬装置

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US938489A (en) * 1908-06-27 1909-11-02 James Mfg Co Method of and apparatus for interiorly coating tubes.
US947440A (en) * 1909-03-25 1910-01-25 Edwin T Greenfield Mechanism for treating metal and other tubes or rods.
US1733404A (en) * 1926-03-15 1929-10-29 Frank A Fahrenwald Process and apparatus for electroplating tubes
US1927162A (en) * 1931-02-27 1933-09-19 Research Corp Electroplating
US1956722A (en) * 1933-05-12 1934-05-01 Anaconda Wire & Cable Co Process of rubberizing tubing
US1997013A (en) * 1930-11-18 1935-04-09 U S Galvanizing & Plating Equi Method and apparatus for treating pipes
US2019709A (en) * 1932-01-22 1935-11-05 Anaconda Wire & Cable Co Method of making latex treated tubing
US2100587A (en) * 1936-07-06 1937-11-30 Kenneth M Chalker Apparatus for coating the interior of tubing and the like
US2408358A (en) * 1945-05-07 1946-09-24 Yates Sheppard Boyd Distributor for stokers
US2859157A (en) * 1956-10-04 1958-11-04 Jr John S Curtiss Method and apparatus for electroplating the interior surface of conductive material apertures

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE939362C (de) * 1953-06-04 1956-02-23 Wilhelm Meyer Verfahren und Vorrichtung zum Innenverchromen

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US938489A (en) * 1908-06-27 1909-11-02 James Mfg Co Method of and apparatus for interiorly coating tubes.
US947440A (en) * 1909-03-25 1910-01-25 Edwin T Greenfield Mechanism for treating metal and other tubes or rods.
US1733404A (en) * 1926-03-15 1929-10-29 Frank A Fahrenwald Process and apparatus for electroplating tubes
US1997013A (en) * 1930-11-18 1935-04-09 U S Galvanizing & Plating Equi Method and apparatus for treating pipes
US1927162A (en) * 1931-02-27 1933-09-19 Research Corp Electroplating
US2019709A (en) * 1932-01-22 1935-11-05 Anaconda Wire & Cable Co Method of making latex treated tubing
US1956722A (en) * 1933-05-12 1934-05-01 Anaconda Wire & Cable Co Process of rubberizing tubing
US2100587A (en) * 1936-07-06 1937-11-30 Kenneth M Chalker Apparatus for coating the interior of tubing and the like
US2408358A (en) * 1945-05-07 1946-09-24 Yates Sheppard Boyd Distributor for stokers
US2859157A (en) * 1956-10-04 1958-11-04 Jr John S Curtiss Method and apparatus for electroplating the interior surface of conductive material apertures

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3208869A (en) * 1961-01-16 1965-09-28 Jones & Laughlin Steel Corp Fluidized coating of pipe
US3055812A (en) * 1961-01-20 1962-09-25 Nyby Bruk Ab Electrolytic treatment of surfaces
US3429787A (en) * 1963-06-18 1969-02-25 Benteler Werke Ag Process and apparatus for electrolytically treating metal tubes
US3506557A (en) * 1967-02-01 1970-04-14 Allegheny Ludlum Steel Electrochemical machining cell
EP0172661A2 (en) * 1984-07-31 1986-02-26 The Upjohn Company Apparatus for internally electropolishing tubes
EP0172661A3 (en) * 1984-07-31 1986-12-30 The Upjohn Company Apparatus for internally electropolishing tubes
US4705611A (en) * 1984-07-31 1987-11-10 The Upjohn Company Method for internally electropolishing tubes
US4589367A (en) * 1984-10-01 1986-05-20 Empire Enterprises, Inc. System for automatically painting pencils
EP0291373A1 (fr) * 1987-05-14 1988-11-17 Framatome Canne tubulaire pour le traitement de la surface intérieure d'un tube
FR2615207A1 (fr) * 1987-05-14 1988-11-18 Framatome Sa Canne tubulaire pour le traitement de la surface interieure d'un tube
US4849084A (en) * 1987-05-14 1989-07-18 Framatome Tubular rod for the treatment of the inside surface of a tube
US5176803A (en) * 1992-03-04 1993-01-05 General Electric Company Method for making smooth substrate mandrels
FR2697538A1 (fr) * 1992-11-03 1994-05-06 Pechiney Recherche Electrode pour dépôt électrophorétique.
EP0596816A1 (fr) * 1992-11-03 1994-05-11 PECHINEY RECHERCHE (Groupement d'Intérêt Economique géré par l'ordonnance du 23 Septembre 1967) Electrode pour dépôt électrophorétique
CN1038263C (zh) * 1992-11-03 1998-05-06 皮奇尼研究所 用于电泳沉积的一种电极
US5596803A (en) * 1993-10-20 1997-01-28 Pechiney Recherche Electrode for electrophoretic deposition
US5507923A (en) * 1993-11-09 1996-04-16 Stouse; Henry J. Method and apparatus for electrolytic polishing of tubular products
US5595640A (en) * 1994-08-29 1997-01-21 Metallglanz Gesellschaft Fuer Entgratung Und Oberflaechentechnik Mbh Method and apparatus for continuous galvanic application of metallic layers on a body

Also Published As

Publication number Publication date
NL124779C (xx)
DE1197719B (de) 1965-07-29
FR1221041A (fr) 1960-05-30
NL235329A (xx)
GB870352A (en) 1961-06-14

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