EP0781857B1 - Procédé de traitement de la surface d'un conducteur électrique tel qu'une barre appartenant à un jeu de barres et barre susceptible d'etre obteneu suivant ce procédé - Google Patents
Procédé de traitement de la surface d'un conducteur électrique tel qu'une barre appartenant à un jeu de barres et barre susceptible d'etre obteneu suivant ce procédé Download PDFInfo
- Publication number
- EP0781857B1 EP0781857B1 EP19960410120 EP96410120A EP0781857B1 EP 0781857 B1 EP0781857 B1 EP 0781857B1 EP 19960410120 EP19960410120 EP 19960410120 EP 96410120 A EP96410120 A EP 96410120A EP 0781857 B1 EP0781857 B1 EP 0781857B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bar
- coating
- process according
- anodizing
- connecting surface
- 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
Links
- 238000000034 method Methods 0.000 title claims description 30
- 239000004020 conductor Substances 0.000 title claims description 10
- 238000000576 coating method Methods 0.000 claims description 28
- 239000011248 coating agent Substances 0.000 claims description 27
- 229910052782 aluminium Inorganic materials 0.000 claims description 17
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 17
- 229910052751 metal Inorganic materials 0.000 claims description 17
- 239000002184 metal Substances 0.000 claims description 17
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 12
- 229910052718 tin Inorganic materials 0.000 claims description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 238000007743 anodising Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- 239000004332 silver Substances 0.000 claims description 7
- 229910052709 silver Inorganic materials 0.000 claims description 7
- 238000005260 corrosion Methods 0.000 claims description 6
- 230000007797 corrosion Effects 0.000 claims description 6
- 238000007254 oxidation reaction Methods 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 6
- 230000008021 deposition Effects 0.000 claims description 5
- 230000003647 oxidation Effects 0.000 claims description 5
- 229910000906 Bronze Inorganic materials 0.000 claims description 4
- 239000010974 bronze Substances 0.000 claims description 4
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 claims description 4
- 239000000049 pigment Substances 0.000 claims description 4
- 239000011135 tin Substances 0.000 claims description 4
- 238000010891 electric arc Methods 0.000 claims description 3
- 238000005470 impregnation Methods 0.000 claims description 3
- 150000002739 metals Chemical class 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 229910001369 Brass Inorganic materials 0.000 claims description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 2
- 239000010951 brass Substances 0.000 claims description 2
- 230000002349 favourable effect Effects 0.000 claims description 2
- 239000004411 aluminium Substances 0.000 claims 2
- 229910000838 Al alloy Inorganic materials 0.000 claims 1
- 238000005480 shot peening Methods 0.000 claims 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 6
- 238000002048 anodisation reaction Methods 0.000 description 5
- 238000000151 deposition Methods 0.000 description 5
- 238000007751 thermal spraying Methods 0.000 description 5
- 238000005488 sandblasting Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 2
- 230000004069 differentiation Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000009718 spray deposition Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/026—Anodisation with spark discharge
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
Definitions
- the present invention relates to a method of treating the surface of a conductor electric such as a bar belonging to a busbar, and busbar likely to be obtained by this process.
- the electrical distribution busbars commonly used in low cabinets voltage, to ensure for example the electrical connection between one or more electrical devices such as circuit breakers and starting devices such as motors, systems lighting etc ..., are made of copper.
- these busbars are used as is, which makes them particularly advantageous, except for a few applications in which they are coated with silver or tin by electrolytic means.
- these copper busbars if they are advantageous, for the reasons above mentioned are still quite expensive. It has already been considered to reduce the price cost of such busbars, to use aluminum busbars. Now, on contact air, aluminum spontaneously covers itself with a solid and insulating oxide layer, alumina.
- the present invention solves these problems and provides an economical method of treatment. from the surface of a conductor such as a bar belonging to a busbar, allowing obtaining bars protected in particular against corrosion, the use of which is facilitated for the operator, and which has improved cooling characteristics.
- the present invention relates to a method of treating the surface of a electrical conductor, such as a bar, belonging to a busbar, especially against oxidation and / or to ensure surface properties favorable to a low resistance of contact, this process being characterized in that it comprises coating a part at less than the connection surface of the bar with a protective conductive metal by thermal spraying.
- the invention also relates to a method for treating the surface of a conductor.
- electric such as a bar belonging to a busbar, in particular against oxidation, characterized in that it comprises the coating of at least part of the surface of connection of the bar with a protective conductive metal and in that prior to deposition of the coating, anodization of the total surface of the bar is carried out sandblasting located on its connection surface.
- the aforementioned coating is treated against corrosion by a process such as microbeading or impregnation.
- the aforementioned coating is deposited by thermal spraying with the flame, electric arc projection or plasma torch projection.
- the aforementioned conductive metal is one of the metals included in the group including tin, silver, copper, bronze, brass, bronze-aluminum (cuproalu)
- pigments are added to the anodizing bath. Color is chosen so as to be different from the color of the metal coating.
- the thickness of the oxide layer deposited during anodization is between 5 and 8 ⁇ m.
- the thickness of the metal coating is between 10 and 500 ⁇ m.
- the bar is made of aluminum and the coating of tin.
- the invention also relates to a bar of the kind previously mentioned, characterized in that it comprises a solid component M made of a conductive material such than aluminum, and has a metal coating on its connection surface protective such as silver or tin. According to another characteristic, its total surface apart from its connection zone is covered with an oxide layer of said material.
- the invention also relates to a bar treated according to one of the methods previously described, and in the form of a profile.
- this profile has a substantially H-shaped cross section, and comprises two longitudinal blanks connected by a transverse bar, said blanks longitudinal comprising respectively two longitudinal edges folded at right angles; forming two extensions whose outer surface constitutes the connection zone of bar.
- Figures 1 to 4 are perspective views of a bar belonging to a busbar, corresponding respectively to the different stages of a treatment process in accordance with the invention.
- this bar 1 is constituted by a section P of section substantially in the form of H, made of aluminum.
- This profile P is constituted by two longitudinal blanks 7, 8 connected by a transverse bar 13. These two longitudinal blanks 7, 8 respectively have two longitudinal edges, folded at right angles to the inside of the profile so as to form two flanges or extensions parallel 9, 10.
- the outer surfaces 11, 12 of these edges 9, 10 form the areas or connection surfaces 2, of the bar 1.
- the bar 1 made of aluminum has not undergone any particular treatment.
- this same bar 1 has undergone anodization, that is to say anodic oxidation on its total surface 4.
- This treatment consists in immersing the bar 1 in an electrolytic solution in which it is electrically connected to an anode. The current is passed from the anode to the cathode, and thus oxygen is released, which oxidizes the part on the surface. The bar 1 is completely oxidized when the current no longer passes because the alumina thus formed is insulating.
- pigments to the bath which will be trapped during electrolytic treatment, and whose function will be to color (for example in black, gold or bronze color) the layer of alumina 5 formed, the thickness of which will commonly be of the order from 5 to 8 ⁇ m.
- a second step we sand the contact surfaces 2 (or connection) of bar 1, as shown in FIG. 3.
- This operation consists of remove the layer of alumina which has just been formed on the contact surfaces 2, this in order to make these surfaces rougher and allow better adhesion of the coating that will be applied in the next step.
- a thermal spraying of a material 3 is carried out non-oxidizable (or slightly oxidizable) on the aforementioned connection surfaces 2 ( Figure 4).
- this projection is carried out as soon as the sandblasting to prevent the alumina from reform.
- the material used is tin.
- Projection techniques thermal of conductive metals being known, they will not be described here precisely. It will simply be noted that the coatings by hot spraying are obtained by the high speed crushing of droplets melted on a substrate, the adhesion of the deposition being ensured by mechanical attachment to the substrate, most often after sandblasting. It will also be noted that there are three projection methods, namely by flame, with an electric arc and a plasma torch.
- this process is particularly well suited to aluminum bars of profile type, because the connection area is very well located, which makes it possible to make the economically more advantageous thermal spray deposition than electrolytic deposition.
- This process therefore makes it possible to use aluminum bars 1 and to protect them with a tin coating 3, since the color of the bar 1, outside the contact surfaces 2, is different (thanks to anodization), from that of said contact surfaces 2. It is then possible to differentiate a pure aluminum bar from a protected bar.
- a copper or bronze coating could also be considered, although copper also has significant porosity and a tendency to corrosion.
- the use of one of these two materials would make it possible to get rid of the operation anodizing, because their color is different from that of aluminum and differentiation would then be possible.
- the anodizing operation is however desirable because it presents a number of advantages. Indeed, in addition to the fact that it allows differentiation between a pure bar and a treated bar, it increases the emissivity of the bar, i.e. the ability of the material to dissipate its heat by radiation. This increase in emissivity improves the cooling of the bar thanks to better infrared radiation and therefore allows a greater amount of current to be transported, in the same bar section and for identical heating.
- This oxide layer aluminum also makes it possible to seal the bond between the coating of surfaces contact and the bar, and thereby limits the effects of corrosion. In addition, it allows change the appearance of the bar, which can be a commercial advantage.
- thermal spraying operation can be followed by a treatment anticorrosion such as for example micro-blasting or impregnation (for example with paraffin).
- a treatment anticorrosion such as for example micro-blasting or impregnation (for example with paraffin).
- the bar 1, produced according to this process thus comprises a massive component in aluminum M and is coated on its connection area 2 with a conductive metal 3 not oxidizable, and on the rest of its surface with a layer of aluminum oxide (or alumina 5).
- the invention also includes a coated copper bar on its connection zone a layer of tin deposited by thermal spraying.
- a coated copper bar on its connection zone a layer of tin deposited by thermal spraying.
- the invention extends to any electrical conductor comprising the Features mentioned in the claims.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Plasma & Fusion (AREA)
- Physics & Mathematics (AREA)
- Coating By Spraying Or Casting (AREA)
- Coating With Molten Metal (AREA)
- Conductive Materials (AREA)
Description
On décrira ci-après un mode de réalisation du procédé de l'invention en référence aux figures.
Ce traitement consiste à plonger la barre 1 dans une solution électrolytique dans laquelle elle est reliée électriquement à une anode. On fait passer le courant de l'anode vers la cathode, et l'on dégage ainsi de l'oxygène, lequel oxyde la pièce en surface. La barre 1 est complètement oxydée lorsque le courant ne passe plus car l'alumine ainsi formée est isolante.
Claims (14)
- Procédé de traitement de la surface d'un conducteur électrique, tel qu'une barre appartenant à un jeu de barres, notamment contre l'oxydation et/ou pour assurer des propriétés de surface favorables à une faible résistance de contact, caractérisé en ce qu'il comprend le revêtement d'une partie au moins de la surface de raccordement (2) de la barre (1) avec un métal conducteur protecteur (3) par projection thermique.
- Procédé selon la revendication 1, caractérisé en ce que préalablement au dépôt du revêtement précité (3), on procède à l'anodisation de la surface totale (4) de la barre (1), puis à un sablage localisé à la surface de raccordement (2) de ladite barre (1).
- Procédé de traitement de la surface d'un conducteur électrique, tel qu'une barre appartenant à un jeu de barres, notamment contre l'oxydation, caractérisé en ce qu'il comprend le revêtement d'une partie au moins de la surface de raccordement (2) de la barre (1) avec un métal conducteur protecteur (3) et en ce que préalablement au dépôt du revêtement (3), on procède à une anodisation de la surface totale (4) de la barre (1) suivie d'un sablage localisé à sa surface de raccordement (2).
- Procédé selon la revendication 2 ou 3, caractérisé en ce qu'après le sablage, le revêtement précité (3) est traité contre la corrosion par un procédé tel que le microbillage ou l'imprégnation.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le revêtement précité (3) est déposé par une projection thermique à la flamme, une projection à l'arc électrique ou une projection à la torche plasme.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le métal conducteur précité (3) est l'un des métaux compris dans le groupe comprenant l'étain, l'argent, le cuivre, le bronze, le laiton, le bronze-aluminium (cuproalu).
- Procédé selon l'une quelconque des revendications 2 à 6, caractérisé en ce que dans le bain d'anodisation son ajoutés des pigments dont la couleur est choisie de manière à se différencier de la couleur du revêtement de métal (3).
- Procédé selon l'une quelconque des revendications 2 à 7, caractérisé en ce que l'épaisseur de la couche d'oxyde (5) déposée lors de l'anodisation est comprise entre 5 et 8 µm.
- Procédé selon l'une quelconque des revendications 1 à 8, caractérisé en ce que l'épaisseur du revêtement de métal (3) est comprise entre 10 et 500 µm.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la barre est en aluminium et le revêtement en étain.
- Barre du genre destinée à assurer la liaison électrique entre un appareil tel un disjoncteur et des appareils de départ tels des moteurs, caractérisée en ce qu'elle comprend un composant massif M en un matériau conducteur tel que l'aluminium, et comporte sur sa surface de raccordement (2) un revêtement d'un métal protecteur (3) tel que l'argent ou l'étain.
- Barre selon la revendication 11, caractérisée en ce que sa surface totale (4) hormis sa surface de raccordement (2) est recouverte d'une couche d'oxyde dudit matériau (5).
- Barre traitée suivant le procédé selon l'une quelconque des revendications 1 à 10, caractérisée en ce qu'elle se présente sous la forme d'un profilé (P).
- Barre selon la revendication 13, caractérisée en ce que le profilé précité (P) présente une section transversale sensiblement en forme de H, et comprend deux flans longitudinaux (7, 8) reliés par une barre transversale (13), lesdits flans longitudinaux (7, 8) comportant respectivement deux bords longitudinaux pliés en équerre formant deux prolongement (9, 10) dont la surface extérieure (11, 12) constitue la zone de raccordement (2) de la barre (1).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9515831 | 1995-12-27 | ||
FR9515831A FR2743205B1 (fr) | 1995-12-27 | 1995-12-27 | Procede de traitement de la surface d'un conducteur electrique tel qu'une barre appartenant a un jeu de barres et barre susceptible d'etre obtenue suivant ce procede |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0781857A1 EP0781857A1 (fr) | 1997-07-02 |
EP0781857B1 true EP0781857B1 (fr) | 2000-05-17 |
Family
ID=9486227
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19960410120 Expired - Lifetime EP0781857B1 (fr) | 1995-12-27 | 1996-12-09 | Procédé de traitement de la surface d'un conducteur électrique tel qu'une barre appartenant à un jeu de barres et barre susceptible d'etre obteneu suivant ce procédé |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0781857B1 (fr) |
DE (1) | DE69608402T2 (fr) |
ES (1) | ES2148710T3 (fr) |
FR (1) | FR2743205B1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10222271A1 (de) * | 2002-05-18 | 2003-06-26 | Leoni Ag | Verfahren zur Erhöhung der Widerstandsfähigkeit einer elektrischen Kontaktverbindung zwischen zwei Kontaktteilen und elektrische Kontaktverbindung |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001086018A2 (fr) * | 2000-05-08 | 2001-11-15 | Ami Doduco Gmbh | Procede de fabrication de pieces qui servent a conduire du courant electrique et qui sont couvertes d'une matiere principalement metallique |
FR2900353B1 (fr) * | 2006-04-27 | 2008-08-29 | Daniel Bernard | Revetement conducteur electrique sur barre en aluminium anodise et son procede de fabrication associe |
CN102817061B (zh) * | 2012-09-07 | 2015-12-02 | 佛山市三水凤铝铝业有限公司 | 一种铝型材电解着色槽阴极管的清洗方法 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB877728A (en) * | 1957-02-13 | 1961-09-20 | Bosch Gmbh Robert | Improvements in or relating to the deposition on aluminium of a layer of copper, copper alloy, tin or zinc |
JPS58189394A (ja) * | 1982-04-28 | 1983-11-05 | Corona Kogyo Kk | 異色アルミニウム又はその合金面の加工法 |
US4490184A (en) * | 1982-09-23 | 1984-12-25 | Ltv Aerospace And Defense Co. | Corrosion resistant thermal control material and process |
DE3671764D1 (de) * | 1985-02-06 | 1990-07-12 | Fujitsu Ltd | Verfahren zur bildung eines komposit-aluminium-filmes. |
-
1995
- 1995-12-27 FR FR9515831A patent/FR2743205B1/fr not_active Expired - Lifetime
-
1996
- 1996-12-09 EP EP19960410120 patent/EP0781857B1/fr not_active Expired - Lifetime
- 1996-12-09 ES ES96410120T patent/ES2148710T3/es not_active Expired - Lifetime
- 1996-12-09 DE DE1996608402 patent/DE69608402T2/de not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10222271A1 (de) * | 2002-05-18 | 2003-06-26 | Leoni Ag | Verfahren zur Erhöhung der Widerstandsfähigkeit einer elektrischen Kontaktverbindung zwischen zwei Kontaktteilen und elektrische Kontaktverbindung |
Also Published As
Publication number | Publication date |
---|---|
DE69608402D1 (de) | 2000-06-21 |
FR2743205B1 (fr) | 1998-02-06 |
FR2743205A1 (fr) | 1997-07-04 |
ES2148710T3 (es) | 2000-10-16 |
EP0781857A1 (fr) | 1997-07-02 |
DE69608402T2 (de) | 2001-08-23 |
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