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

Info

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
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 Direction General pour lArmement DGA filed Critical Direction General pour lArmement DGA
Publication of EP0084752A1 publication Critical patent/EP0084752A1/fr
Application granted granted Critical
Publication of EP0084752B1 publication Critical patent/EP0084752B1/fr
Expired legal-status Critical Current

Links

Images

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
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
FR8200868 1982-01-21

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 (sv)
DE (1) DE3269763D1 (sv)
FR (1) FR2520009A1 (sv)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4853099A (en) * 1988-03-28 1989-08-01 Sifco Industries, Inc. Selective electroplating apparatus
US4931150A (en) * 1988-03-28 1990-06-05 Sifco Industries, Inc. Selective electroplating apparatus and method of using same
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
FR2520009B1 (sv) 1984-03-23
EP0084752A1 (fr) 1983-08-03
DE3269763D1 (en) 1986-04-10
FR2520009A1 (fr) 1983-07-22

Similar Documents

Publication Publication Date Title
EP0084752B1 (fr) Procédé de chromage intérieur d'un élément tubulaire, anode pour sa mise en oeuvre
EP1647996B2 (fr) Cable toronne en aluminium cuivre, et procede pour sa fabrication
EP1204787B1 (fr) Procede de nickelage en continu d'un conducteur en aluminium et dispositif correspondant
EP0425354B1 (fr) Installation et procédé de revêtement électrolytique d'une bande métallique
EP0797219A1 (fr) Procédé de fabrication de câbles coaxiaux
EP2105994A1 (fr) Dispositif de connexion de deux cables supraconducteurs
EP0024220B1 (fr) Procédé de fabrication d'un tube composite métal-matière plastique et appareillage pour sa mise en oeuvre
FR2655275A2 (fr) Perfectionnement au procede de fabrication d'un tube poreux revetu interieurement d'une membrane semi-permeable par electrophorese.
FR2674365A1 (fr) Cable coaxial a faibles pertes.
FR2660301A1 (fr) Dispositif pour la production d'ozone.
EP1106293B1 (fr) Electrode pour l'usinage d'une pièce par électroérosion et son procédé de fabrication
FR2693129A1 (fr) Outillage pour le traitement électrochimique de la surface interne d'un tube.
CA2210961A1 (fr) Anode de plaquage electrolytique resonante
FR2576323A1 (fr) Procede de traitement de profils conducteurs, notamment metalliques, installation pour sa mise en oeuvre et profils traites ainsi obtenus
EP0403362A1 (fr) Rouleau conducteur de courant
FR2927726A1 (fr) Cable electrique facilement degainable
EP0693141B1 (fr) Procede de fabrication d'un conducteur en aluminium argente, dispositif pour la mise en oeuvre du procede et conducteur ainsi obtenu
WO2024116049A1 (fr) Dispositif pour le traitement de surface électrochimique d'une surface intérieure d'un élément tubulaire en matériau électroconducteur, notamment d'un tube d'arme, et système comprenant un tel dispositif
FR2574095A1 (fr) Appareil pour le traitement electrochimique, du type a circulation d'electrolyte
CH608419A5 (en) Die head for extrusion of multilayer cable sheathing - with multiple die sleeves for independent layer thickness control
EP3505657A1 (fr) Rouleaux conducteurs de courant
CH241664A (fr) Procédé et dispositif pour l'application électrolytique d'une couche de métal sur la surface interne d'un corps creux, tel que par exemple le canon d'une arme à feu.
CH620621A5 (en) Electrode for electrical discharge (spark erosion) machining
FR2666004A1 (fr) Hamecon multiple et procede pour sa fabrication.
EP0753894A1 (fr) Supraconducteur multi-brins à barrière résistive intégrée

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19830103

AK Designated contracting states

Designated state(s): CH DE LI

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CH DE LI

REF Corresponds to:

Ref document number: 3269763

Country of ref document: DE

Date of ref document: 19860410

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19890126

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19891016

Year of fee payment: 8

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19900901

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19901231

Ref country code: CH

Effective date: 19901231

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL