EP0596816B1 - Electrode pour dépÔt électrophorétique - Google Patents

Electrode pour dépÔt électrophorétique Download PDF

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Publication number
EP0596816B1
EP0596816B1 EP93420437A EP93420437A EP0596816B1 EP 0596816 B1 EP0596816 B1 EP 0596816B1 EP 93420437 A EP93420437 A EP 93420437A EP 93420437 A EP93420437 A EP 93420437A EP 0596816 B1 EP0596816 B1 EP 0596816B1
Authority
EP
European Patent Office
Prior art keywords
electrode
zones
annular zone
coated
width
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 - Lifetime
Application number
EP93420437A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0596816A1 (fr
Inventor
Claude Encrenaz
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.)
Pechiney Recherche GIE
Original Assignee
Pechiney Recherche GIE
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 Pechiney Recherche GIE filed Critical Pechiney Recherche GIE
Publication of EP0596816A1 publication Critical patent/EP0596816A1/fr
Application granted granted Critical
Publication of EP0596816B1 publication Critical patent/EP0596816B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/22—Servicing or operating apparatus or multistep processes

Definitions

  • the invention relates to an electrode for electrophoretic deposition on a conductive surface.
  • plastic material for example a varnish on metallic objects (or at least electrically conductive) is done by placing said object in the electrode position of a DC source, the other electrode , connected to the other pole of the direct current source, having a suitable configuration, these electrodes being placed in the electrophoresis bath.
  • the problem to be solved is to obtain a thin deposit, typically 2-20 ⁇ m, of thickness as uniform as possible on the surfaces of the object to be coated.
  • a conductive electrode is placed along the axis of revolution of said object, and preferably has the shape of a solid cylinder or of a conductive tube, of circular section of the same axis as the latter.
  • the applicant company has found that in order to obtain much more uniform thicknesses of deposit, it suffices to coat the external lateral surface of the electrode with an insulating layer, and to incise it in one or more places annularly over a width e up to a few mm in order to expose the conductive surface. This or these incisions are located opposite the object to be coated.
  • the width of each incision is preferably between 0.5 and 3 mm, in particular of the order of 1 mm.
  • uniformly close means at a substantially constant distance from the axis, between 70 and 90% of the distance from the axis of the surface to be coated.
  • the precise determination of the position or positions of the empirically determined incisions can be specified by the calculation methods for determining the equipotential lines, for example for the finite element method, in the immediate vicinity of the surface to be coated (the surface initial of the metallic object to be coated represents "by construction" an equipotential) this surface being a surface of revolution around an axis, of generatrix of any shape.
  • Various equipotential determination tests make it possible to determine the optimal configuration.
  • the corresponding device therefore consists of a solid cylindrical or tubular conductive electrode, coated on its external lateral face with an insulating layer except for one or more annular zones of small width facing the object to be coated.
  • the width of each annular zone is less than a few mm, preferably between 0.5 and 3 mm and generally close to 1 mm. Their number is generally less than or equal to 3.
  • FIG. 1 shows a 1/2 axial section of the device for electrophoretically depositing a resin on the internal surface of a box body used in example 1; the dimensions given are millimeter.
  • Figure 2 shows in 1/2 axial section the equipotential curves, determined using a finite element calculation software in the geometric and electrical configuration of Example 1, for an ideally cylindrical box body (B) with flat bottom shown in this figure.
  • the equidistance of the equipotentials is 20 V.
  • Figure 3 shows in 1/2 axial section the equipotential curves (20 V) under the geometric and electrical conditions of Example 1, the electrode comprising 2 incisions of 1 mm wide, for a box body B ideally cylindrical with flat bottom, as shown in this figure.
  • the filing conditions were as follows: The box (1) is connected to the anode (+) of a 200 V direct current source and the electrode (2) to the other pole. It is placed in a bath of anaphoretic varnish based on epoxy (at a rate of 10 g / l in water whose pH is 7.7, the conductivity 1.76 mS / m and the temperature maintained at 30 ° C), the current is pulsed: 50 ms under current + 20 ms without current and the treatment lasted 7 sec.
  • This electrode finds its application in all cases of electrophoretic coating whose relative variation in thickness must be kept ⁇ 10%.

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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)
  • Paints Or Removers (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
  • Physical Vapour Deposition (AREA)
EP93420437A 1992-11-03 1993-11-02 Electrode pour dépÔt électrophorétique Expired - Lifetime EP0596816B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9213436A FR2697538B1 (fr) 1992-11-03 1992-11-03 Electrode pour dépôt électrophorétique.
FR9213436 1992-11-03

Publications (2)

Publication Number Publication Date
EP0596816A1 EP0596816A1 (fr) 1994-05-11
EP0596816B1 true EP0596816B1 (fr) 1996-10-09

Family

ID=9435339

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93420437A Expired - Lifetime EP0596816B1 (fr) 1992-11-03 1993-11-02 Electrode pour dépÔt électrophorétique

Country Status (9)

Country Link
EP (1) EP0596816B1 (ja)
JP (1) JPH06212493A (ja)
KR (1) KR940011669A (ja)
CN (1) CN1038263C (ja)
CA (1) CA2109183A1 (ja)
DE (1) DE69305306T2 (ja)
ES (1) ES2092794T3 (ja)
FR (1) FR2697538B1 (ja)
GR (1) GR3021329T3 (ja)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100457982C (zh) * 2004-12-01 2009-02-04 哈尔滨工业大学 带状不良导电体连续电镀阳极装置
CN100467677C (zh) * 2004-12-01 2009-03-11 哈尔滨工业大学 线状不良导电体连续电镀阳极装置
JP6861452B1 (ja) * 2021-01-28 2021-04-21 柳沼精工株式会社 マスキング装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL235329A (ja) * 1958-01-22
US3325390A (en) * 1963-07-01 1967-06-13 Ford Motor Co Method and apparatus for electrocoating using an auxiliary electrode

Also Published As

Publication number Publication date
JPH06212493A (ja) 1994-08-02
FR2697538B1 (fr) 1994-12-16
EP0596816A1 (fr) 1994-05-11
DE69305306D1 (de) 1996-11-14
CN1038263C (zh) 1998-05-06
CA2109183A1 (fr) 1994-05-04
CN1089312A (zh) 1994-07-13
KR940011669A (ko) 1994-06-21
FR2697538A1 (fr) 1994-05-06
DE69305306T2 (de) 1997-03-06
ES2092794T3 (es) 1996-12-01
GR3021329T3 (en) 1997-01-31

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