EP0084752B1 - Procédé de chromage intérieur d'un élément tubulaire, anode pour sa mise en oeuvre - Google Patents

Procédé de chromage intérieur d'un élément tubulaire, anode pour sa mise en oeuvre Download PDF

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Publication number
EP0084752B1
EP0084752B1 EP19820402398 EP82402398A EP0084752B1 EP 0084752 B1 EP0084752 B1 EP 0084752B1 EP 19820402398 EP19820402398 EP 19820402398 EP 82402398 A EP82402398 A EP 82402398A EP 0084752 B1 EP0084752 B1 EP 0084752B1
Authority
EP
European Patent Office
Prior art keywords
anode
fact
per
different
chromium
Prior art date
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
Application number
EP19820402398
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0084752A1 (fr
Inventor
Bernard Marliac
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Direction General pour lArmement DGA
Original Assignee
Direction General pour lArmement DGA
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Filing date
Publication date
Application filed by Direction General pour lArmement DGA filed Critical Direction General pour lArmement DGA
Publication of EP0084752A1 publication Critical patent/EP0084752A1/fr
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Publication of EP0084752B1 publication Critical patent/EP0084752B1/fr
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Classifications

    • 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

Definitions

  • the invention relates to a process for chroming the interior surface of a tubular element, such as for example a weapon tube, by electrolytic deposition as well as to an anode allowing the implementation of this process.
  • One solution is to make the two thicknesses separately by doing two successive chrome plating.
  • Another solution consists in carrying out the chromium plating of the two parts in the same bath by setting up a cover coming to mask the part of the deposit of small thickness at the end of the time necessary for its chromium plating.
  • the first solution is obviously long since it requires two successive chromium plating operations.
  • the second solution is difficult to implement and in any case requires intervention during the electrolytic treatment.
  • US-A-3,706,651 describes a device for minimizing the irregularities of an electrolytic deposit on a curved surface, comprising a rotary anode the active part of which comprises conductive rings separated by insulating rings, each conductive ring being supplied separately with electricity .
  • the present invention therefore proposes to remedy the drawbacks indicated above and to provide a method of chromium plating of the interior surface of a tubular element which makes it possible, in a single operation, to chromium plating several zones intended to have deposits of different thicknesses and which simultaneously allows a gradual and regular transition between deposits of different thicknesses.
  • Yet another objective of the invention is to provide such a method which is easy to implement and of an economic cost price while not requiring more time than is necessary to ensure the establishment of the deposit. the thickest.
  • Yet another objective of the invention is to provide anodes which make it possible to implement such a method.
  • the subject of the invention is a method for producing chromium deposits of different thicknesses on successive sections of the inner wall of a tubular element by electrolytic means in which one places, inside the tubular element , an anode centered on the axis of the tubular element and an electrolytic liquid is introduced allowing, during the passage of the electric current, to deposit a deposit of chromium on the tubular wall forming cathode of the tubular element, characterized in that the anode is made up of several parts of different electrical conductivities, namely one part per section of tubular element to be coated, the value of the conductivity and the diameter of the corresponding part of anode being chosen as a function of the thickness of the deposit to be made on the corresponding section of the wall of the tubular element.
  • the anode provided may consist of several consecutive strands of different conductivities or, if appropriate, of a central part coated with tubular sleeves of different conductivities.
  • the electrolysis liquid is circulated inside the tube in order to constantly ensure its renewal and its homogenization.
  • the subject of the invention is also, as new industrial products, the anodes used in this process and characterized in that they comprise at least two successive effective parts of different conductivities.
  • a tubular element 1 comprising two sections, namely a fairly elongated section 2, followed by a shorter section 3.
  • the section 2 has a constant diameter over most of its length, then a first conical widening of slight slope 2a, followed of a cylindrical part 2b.
  • the section 3 has a cylindrical part 3a of large diameter while a conical connection zone 4 joins the cylindrical parts 2b and 3a, the zone 4 belonging half to the section 2 and half to the section 3.
  • a spacer 8 surrounding the emerging end of the anode 5 is supported on the part 6 and ends with a part 9 forming both a suspension and contact hook for the anode.
  • a part 10 also acting as a "current thief", this part supporting a centering part 11.
  • a nut 12 On the threaded end of the anode 5, is screwed a nut 12 with a washer 13 on which comes to bear a tubular spacer 14 with the interposition of a number of Belleville washers 15 which, taking support on the other hand on the part 11, serve to put the anode 5 in tension and to keep it strictly in a coaxial position.
  • the anode 5 has, inside the tubular element 1, a first part 5a formed of a brass-lead rod which is followed, in section 3, by a strand 5b of platinum titanium. Outside the tube, the strand 5b is continued by a brass-lead rod 5c. It can be seen that the strands 5a and 5b have different diameters, the diameter of the strand 5a being greater than that of the strand 5b.
  • a usual bath of chromic acid is circulated in the tubular element, around the anode 5, entering via the conduit 16 and leaving via the conduit 17, means for circulation and regeneration of the bath (not shown ) being arranged outside.
  • the length of the transition zone 4 is approximately 10 mm.

Landscapes

  • 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)
  • Electroplating And Plating Baths Therefor (AREA)
EP19820402398 1982-01-21 1982-12-30 Procédé de chromage intérieur d'un élément tubulaire, anode pour sa mise en oeuvre Expired EP0084752B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8200868 1982-01-21
FR8200868A FR2520009A1 (fr) 1982-01-21 1982-01-21 Procede de chromage interieur d'un element tubulaire, anode pour sa mise en oeuvre et element chrome obtenu selon ce procede

Publications (2)

Publication Number Publication Date
EP0084752A1 EP0084752A1 (fr) 1983-08-03
EP0084752B1 true EP0084752B1 (fr) 1986-03-05

Family

ID=9270180

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820402398 Expired EP0084752B1 (fr) 1982-01-21 1982-12-30 Procédé de chromage intérieur d'un élément tubulaire, anode pour sa mise en oeuvre

Country Status (3)

Country Link
EP (1) EP0084752B1 (pl)
DE (1) DE3269763D1 (pl)
FR (1) FR2520009A1 (pl)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4931150A (en) * 1988-03-28 1990-06-05 Sifco Industries, Inc. Selective electroplating apparatus and method of using same
US4853099A (en) * 1988-03-28 1989-08-01 Sifco Industries, Inc. Selective electroplating apparatus
DE4335139A1 (de) * 1993-10-15 1995-04-20 Rheinmetall Ind Gmbh Verfahren zur Herstellung eines Waffenrohres mit einer verschleißfesten Innenbeschichtung
DE4419864C2 (de) * 1994-06-07 2001-01-11 Rheinmetall W & M Gmbh Elektrode zur elektrolytischen Innenbeschichtung und/oder zum Elektropolieren von Waffenrohren
JP2001073198A (ja) * 1999-07-01 2001-03-21 Sumitomo Special Metals Co Ltd 電気めっき用装置および該装置を用いた電気めっき方法
SE529744C2 (sv) * 2005-12-22 2007-11-13 Abb Technology Ag Anordning och metod för metallisk beläggning samt användning av anordningen
CN115976617A (zh) * 2022-11-23 2023-04-18 西安空间无线电技术研究所 一种辅助阳极及铝合金多弯波导零件镀银工艺方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR712505A (fr) * 1930-06-14 1931-10-03 Orfevrerie Christofle Procédé et localisation de dépôts électrolytiques de métaux
GB712314A (en) * 1951-02-08 1954-07-21 Electro Metal Hardening Co S A Method of and apparatus for a uniform electrolytic internal chromium plating of tubes
US3706651A (en) * 1970-12-30 1972-12-19 Us Navy Apparatus for electroplating a curved surface

Also Published As

Publication number Publication date
EP0084752A1 (fr) 1983-08-03
FR2520009A1 (fr) 1983-07-22
DE3269763D1 (en) 1986-04-10
FR2520009B1 (pl) 1984-03-23

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