EP0663461A1 - Apparatus for electrochemically treating in particular selectively a conducting workpiece - Google Patents
Apparatus for electrochemically treating in particular selectively a conducting workpiece Download PDFInfo
- Publication number
- EP0663461A1 EP0663461A1 EP94402891A EP94402891A EP0663461A1 EP 0663461 A1 EP0663461 A1 EP 0663461A1 EP 94402891 A EP94402891 A EP 94402891A EP 94402891 A EP94402891 A EP 94402891A EP 0663461 A1 EP0663461 A1 EP 0663461A1
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- electrolyte
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- pump
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F3/00—Electrolytic etching or polishing
- C25F3/02—Etching
- C25F3/14—Etching locally
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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
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/02—Electroplating of selected surface areas
- C25D5/026—Electroplating of selected surface areas using locally applied jets of electrolyte
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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
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/04—Electroplating with moving electrodes
- C25D5/06—Brush or pad plating
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F7/00—Constructional parts, or assemblies thereof, of cells for electrolytic removal of material from objects; Servicing or operating
Definitions
- the subject of the present invention is a device for the electrochemical treatment, in particular localized, of a conductive substrate by displacement on said substrate, and usable in all positions, which comprises an envelope provided with an opening and defining a space, an electrode arranged in this space and intended to be connected to one of the terminals of an electric current source, the conductive substrate being intended to be connected to the other terminal of this source, and an electrolyte supply and an output of electrolyte, both in communication with said space.
- Such a device makes it possible in particular to produce metallic coatings formed electrochemically and to carry out localized recharges or touch-ups on metallic surfaces.
- surfaces In the automotive, aeronautical or railway industry, it frequently happens that surfaces must be prepared before assembly or before another surface treatment. In these industries and in many others, including plastics or mechanics, it also happens that metal parts or surfaces undergo wear, scratches, scrapes or corrosion attacks which justify such localized metal touch-ups.
- electrochemical treatment devices such as, for example, devices of the buffer type, as well as devices using electrolyte circulation chambers or cells or gels in order to avoid electrolyte flows.
- the present invention therefore aims to overcome the aforementioned drawbacks and, to do this, it provides a device as defined in the first paragraph of this description and which is characterized in that it further comprises a body of absorbent material, flexible, non-conductive of electricity and permeable to gases and liquids, this body being in contact with said electrode and sealing in said opening projecting from the latter, a first pump mounted on said electrolyte supply and a second pump mounted on said electrolyte outlet, the flow rate of the second pump being greater than that of the first pump so as to create a depression in said space.
- the electrolyte reaching the interior space of the tool is partly retained by the body of absorbent material with which it comes into contact, thus ensuring electrical continuity between the electrode and the substrate. conductor to be processed. Furthermore, due to the depression prevailing within this space, there is continuous suction of the excess electrolyte. The electrolyte is thus continuously renewed, which contributes to the dissipation of the heat generated by the electrochemical treatment. In addition, and always due to this depression, there is continuous suction of outside air through all the mass of the body of absorbent material, which prevents any untimely flow through said opening, regardless of the position of use of the device. In addition, this air intake ensures the cooling of the electrolyte heating up under the application of high intensity currents. In addition, the device according to the invention makes it possible to treat not only flat, concave or convex surfaces, but also any edges that the substrate to be treated could have.
- said electrolyte supply opens into said space in the vicinity of said body of absorbent material, it being specified that the electrolyte supply preferably comprises at least one bore made in the electrode and opening onto the surface of this electrode, at the level of the zone of contact of the latter with said body of absorbent material.
- the electrolyte as soon as it leaves the electrolyte supply, arrives directly on the body of absorbent material to spread uniformly throughout the mass of this body.
- said electrolyte outlet originates in said space preferably in the vicinity of said body of absorbent material.
- the electrolyte supply and the electrolyte outlet each comprise a flexible tube and said first and second pumps are peristaltic pumps which more precisely comprise two rotors provided with peripheral rollers and mounted axially on a shaft suitable for being rotated, the rollers of one of the rotors cooperating with the flexible tube of the electrolyte supply and the rollers of the other rotor cooperating with the flexible tube of the electrolyte outlet, and the diameters of said rotors and / or said flexible tubes being chosen to create said depression in said space.
- the circulation flow in the electrolyte supply and the flow in the electrolyte outlet are linked and frozen once and for all. This eliminates any flow control during the use of the device and it is immediately operational without any need to make any adjustment whatsoever. Furthermore, the stopping of the electrolyte supply and the stopping of the electrolyte outlet can be obtained simultaneously by a single operation, that is to say simply stopping the drive motor of the tree.
- the absorbent material constituting the body used in the device of the invention may in particular be made of a material having properties of chemical resistance with respect to the electrolyte and of thermal resistance in the working temperature range (from 15 ° C to 60 ° C).
- This material must also be non-conductive of electricity and permeable to gases and liquids; finally, it must be chosen so as not to scratch the substrate to be treated. It may for example be polyester wadding or a textile material, woven or nonwoven, consisting of fibers or nylon felt.
- the source of electric current may be a source of pulsed current or direct current.
- the device as defined above allows the realization of all types of electrochemical treatments. It may first be the production of an electrolytic deposit; in this case, the substrate to be treated will constitute the cathode and the electrode of the device will constitute the anode, this electrode being made of a material insoluble under the treatment conditions. It may also be a demetallization treatment using a demetallization electrolyte, the substrate to be treated being chosen as the anode and the electrode of the device as the cathode. Finally, it may be an anodization treatment of any substrate to be treated consisting of an oxidizable material such as aluminum, titanium and their alloys; in this application, the substrate to be treated will be chosen as the anode and the electrode of the device as the cathode.
- FIG. 1 is a schematic sectional view of the treatment device associated with a schematic electrical installation
- FIGS. 2 and 3 are partial schematic representations of the peristaltic pumps used in a preferred embodiment.
- FIG. 1 shows more precisely a device according to the invention for anodic oxidation making it possible to prepare a surface S of an aluminum part A, before bonding.
- the device according to the invention comprises an envelope 1 having a side wall 2, a rear wall 3 and a front opening 4 opposite the rear wall 3.
- This envelope which is made of insulating material, for example polypropylene or PVDF, defines a internal space 5 in which is housed a cathode 6 opposite the opening 4.
- This cathode has a rear face 6a and a front face 6b.
- This same cathode can, for example, have a circular, square or rectangular cross-section, the useful cathode surface being able to vary from a few mm2 to a few cm2.
- the cathode 6 is moreover maintained in the space 5 by any means and in particular by fixing, by its rear face 6a, to the rear wall of the envelope 1.
- the cathode 6 has dimensions such that d on the one hand, it defines with the inner face of the side wall 2 of the envelope 1 a continuous peripheral chamber and that, on the other hand, this front face 6b is located at a certain distance from the opening 4.
- the cathode 6 is connected to the "minus" terminal 7 of a current generator G, in particular of pulsed current, the "plus” terminal 8 of which is connected to a point 9 of the part to be treated A.
- the cathode 6 is provided with a bore 10 originating on its rear face 6a and emerging on its front face 6b; although a single hole is shown in Figure 1, it is advantageous to provide several holes arranged in the cathode so that they open uniformly over the entire front face 6a. This or these holes are connected, at the rear face 6a of the electrode, by a connector 11, to a conduit 12 for supplying electrolyte.
- the wall 2 of the envelope 1 is further provided with a bore 13 extending from the inner face of this wall 2 to the outer face of the latter where it is connected by a connector 14 to a conduit 15 d discharge of electrolyte resulting in a electrolyte reserve R.
- the opening 4 is closed by an absorbent pad 16 whose thickness is chosen so that on the one hand, it is in contact with the entire front face 6b of the electrode 6 and of on the other hand, protrude slightly from said opening, it being specified that the bore 13 will be made in such a way that it opens into space 5 at a point sufficiently distant from opening 4 so that this point is not covered by said pad 16.
- this thickness could be 5 mm.
- conduit 15 is connected to the suction of a pump 17 whose delivery is connected to a conduit 18 which communicates with the reserve of electrolyte.
- conduit 12 As for the conduit 12, it is connected to the discharge of a pump 19, the suction of which is connected to a conduit 20, the free end of which dips into the electrolyte of the reserve R.
- the pumps 17 and 19 are chosen to have respective flow rates making it possible to create a vacuum inside the casing 1, that is to say in the peripheral chamber defined by the inner face of the side wall 2 and the external surface of the electrode 6. These flows are in particular a function of the surface of the opening 4, the nature of the pad 16 and the thickness of the latter and it will be easy for the skilled person to define these flows by some preliminary tests. As an indication, it will be noted that the ratio of the flow rate of the pump 17 to the flow rate of the pump 19 may for example be around 6.
- the pumps 17 and 19 are brought into action.
- the electrolyte E from the reserve R is sucked up by the pump 19 and brought from the reserve R via the conduit 20, the pump 19, the conduit 12 and the bore 10 on the buffer 16 which is thus impregnated with the electrolyte.
- the flow rate of the pump 19 is chosen so that a sufficient quantity of electrolyte reaches the buffer 16 in order to carry out the anodic oxidation under good conditions.
- the pump 17 is chosen to have a flow rate making it possible to create, inside the envelope 1, a sufficient vacuum without drying the pad 16.
- the electrode 6 and the part A are connected to the current generator G.
- the device is then operational to carry out the anodic oxidation and it suffices to move this device, manually or mechanically, over the surface S to be treated and orthogonally with respect to this surface.
- the two pumps 17 and 19 are preferably peristaltic pumps shown schematically and partially in Figures 2 (elevation view) and 3 (sectional view along line III-III of Figure 2).
- These two pumps include two rotors 21, 22 both mounted axially on a common shaft 23 capable of being driven in rotation by a drive motor (not shown).
- the rotor 21 has at its periphery three rollers 24, 25, 26 equidistant and the rotor 22 has at its periphery two rollers 27, 28 diametrically opposite.
- Said pumps also comprise a first, semi-circular bearing surface 29 on which is applied a flexible tube with circular section 30 connecting the conduits 12 and 20 shown in FIG.
- the rotor 21 is arranged and dimensioned in diameter so that its rollers 24-26 compress the tube 30 on the bearing surface 29 in crushing it over its entire diameter, so that when the rotor 21 is rotated, said rollers moving along the tube 30 advance the electrolyte in this tube 30.
- the rotor 22 is disposed and dimensioned in diameter so that its rollers 27, 28 compress the tube 32 on the bearing surface 31 by crushing it over its entire diameter so that when the rotor 22 is brought into rotation, said rollers moving along the tube 32 advance the electrolyte in this tube 32.
- the electrolyte progresses in the tube 30 from conduit 20 to conduit 12 and, in tube 32, from conduit 15 to conduit 18.
- the diameter of the rotors 21 and 22 and / or the diameter of the flexible tubes 30, 32 are also chosen so that the output flow of the tube 32 is greater than that at the outlet of the tube 30 so as to create a vacuum within the interior space 5.
- the diameter of the rotor 22 and the diameter of the flexible tube 32 are greater than the diameter of the rotor 21 and the diameter of the flexible tube 30 respectively.
- the device according to the invention is suitable for being used on parts of the most diverse shape and volume, and is not limited to flat surfaces.
- it can be used on surfaces to be treated which have dimensions of a few square centimeters to a few square decimetres or at the level of sheet metal joints, flat or "staircase”; or on convex surfaces or sharp edges.
- the surfaces to be treated can also have all the inclinations; we can in particular carry out ceiling touch-ups.
- touch-ups of electrochemical treatment can, according to the invention, be carried out either in a fixed station in a laboratory or in a workshop, or in a mobile station for interventions on site. In the latter case, advantage will be taken of the total absence of flow out of the device whatever its position (this due to the vacuum created by the two pumps).
Abstract
Description
La présente invention a pour objet un dispositif pour le traitement électrochimique, notamment localisé, d'un substrat conducteur par déplacement sur ledit substrat, et utilisable en toutes positions, qui comprend une enveloppe pourvue d'une ouverture et définissant un espace, une électrode disposée dans cet espace et destinée à être reliée à l'une des bornes d'une source de courant électrique, le substrat conducteur étant destiné à être relié à l'autre borne de cette source, et une amenée d'électrolyte et une sortie d'électrolyte, toutes deux en communication avec ledit espace.The subject of the present invention is a device for the electrochemical treatment, in particular localized, of a conductive substrate by displacement on said substrate, and usable in all positions, which comprises an envelope provided with an opening and defining a space, an electrode arranged in this space and intended to be connected to one of the terminals of an electric current source, the conductive substrate being intended to be connected to the other terminal of this source, and an electrolyte supply and an output of electrolyte, both in communication with said space.
Un tel dispositif permet notamment de réaliser des revêtements métalliques formés par voie électrochimique et d'effectuer des rechargements localisés ou des retouches sur des surfaces métalliques. Dans l'industrie automobile, aéronautique ou ferroviaire, il arrive fréquemment que des surfaces doivent être préparées avant assemblage ou avant un autre traitement de surface. Dans ces industries et dans de nombreuses autres, parmi lesquelles la plasturgie ou la mécanique, il arrive aussi que des pièces ou des surfaces métalliques subissent une usure, des rayures, des éraflures ou des atteintes de corrosion qui justifient de telles retouches métalliques localisées.Such a device makes it possible in particular to produce metallic coatings formed electrochemically and to carry out localized recharges or touch-ups on metallic surfaces. In the automotive, aeronautical or railway industry, it frequently happens that surfaces must be prepared before assembly or before another surface treatment. In these industries and in many others, including plastics or mechanics, it also happens that metal parts or surfaces undergo wear, scratches, scrapes or corrosion attacks which justify such localized metal touch-ups.
On connaît déjà de tels dispositifs de traitement électrochimique tels que par exemple des dispositifs du type tampon, ainsi que des dispositifs faisant appel à des chambres ou des cellules à circulation d'électrolyte ou à des gels afin d'éviter des écoulements d'électrolyte.There are already known such electrochemical treatment devices such as, for example, devices of the buffer type, as well as devices using electrolyte circulation chambers or cells or gels in order to avoid electrolyte flows.
Ces dispositifs présentent cependant toujours des risques d'écoulement lors du traitement, liés à la qualité de l'étanchéité assurée par les joints ou lors du nettoyage après traitement (dans le cas des gels), et des risques liés à l'uniformité du traitement. Ainsi, les fuites d'électrolyte notamment lors du déplacement du dispositif sur le substrat présentent un réel danger pour les zones voisines ne devant pas être traitées et pour l'opérateur, en raison du caractère souvent corrosif des électrolytes utilisés.However, these devices always present risks of leakage during treatment, linked to the quality of the seal provided by the seals or during cleaning after treatment (in the case of gels), and risks linked to the uniformity of treatment. . Thus, electrolyte leakage, in particular during movement of the device on the substrate, presents a real danger for the neighboring areas which must not be treated and for the operator, because of the often corrosive nature of the electrolytes used.
La présente invention a par conséquent pour objet de palier les inconvénients susmentionnés et, pour ce faire, elle propose un dispositif tel que défini au premier paragraphe de cette description et qui se caractérise en ce qu'il comprend en outre un corps en matière absorbante, souple, non conductrice de l'électricité et perméable aux gaz et aux liquides, ce corps étant en contact avec ladite électrode et obturant dans ladite ouverture en faisant saillie hors de cette dernière, une première pompe montée sur ladite amenée d'électrolyte et une deuxième pompe montée sur ladite sortie d'électrolyte, le débit de la deuxième pompe étant supérieur à celui de la première pompe de manière à créer une dépression dans ledit espace.The present invention therefore aims to overcome the aforementioned drawbacks and, to do this, it provides a device as defined in the first paragraph of this description and which is characterized in that it further comprises a body of absorbent material, flexible, non-conductive of electricity and permeable to gases and liquids, this body being in contact with said electrode and sealing in said opening projecting from the latter, a first pump mounted on said electrolyte supply and a second pump mounted on said electrolyte outlet, the flow rate of the second pump being greater than that of the first pump so as to create a depression in said space.
On comprendra que grâce à cette disposition, l'électrolyte parvenant dans l'espace intérieur de l'outil est en partie retenu par le corps en matière absorbante avec lequel il entre en contact, assurant ainsi une continuité électrique entre l'électrode et le substrat conducteur à traiter. Par ailleurs, en raison de la dépression régnant au sein de cet espace, il y a aspiration en continu de l'excédent d'électrolyte. L'électrolyte se trouve ainsi renouvelé en continu, ce qui contribue à la dissipation de la chaleur générée par le traitement électrochimique.En outre, et toujours en raison de cette dépression, il y a aspiration en continu d'air extérieur au travers de toute la masse du corps en matière absorbante, ce qui empêche tout écoulement intempestif par ladite ouverture et ce, quelle que soit la position d'utilisation du dispositif. En outre, cette aspiration d'air assure le refroidissement de l'électrolyte s'échauffant sous l'application de courants d'intensité élevée. De plus, le dispositif selon l'invention permet de traiter non seulement des surfaces planes, concaves ou convexes, mais encore les éventuelles arêtes que pourrait présenter le substrat à traiter.It will be understood that, thanks to this arrangement, the electrolyte reaching the interior space of the tool is partly retained by the body of absorbent material with which it comes into contact, thus ensuring electrical continuity between the electrode and the substrate. conductor to be processed. Furthermore, due to the depression prevailing within this space, there is continuous suction of the excess electrolyte. The electrolyte is thus continuously renewed, which contributes to the dissipation of the heat generated by the electrochemical treatment. In addition, and always due to this depression, there is continuous suction of outside air through all the mass of the body of absorbent material, which prevents any untimely flow through said opening, regardless of the position of use of the device. In addition, this air intake ensures the cooling of the electrolyte heating up under the application of high intensity currents. In addition, the device according to the invention makes it possible to treat not only flat, concave or convex surfaces, but also any edges that the substrate to be treated could have.
Selon un mode de réalisation du dispositif de l'invention, ladite amenée d'électrolyte débouche dans ledit espace au voisinage dudit corps en matière absorbante, étant précisé que l'amenée d'électrolyte comprend de préférence au moins un perçage pratiqué dans l'électrode et débouchant à la surface de cette électrode, au niveau de la zone de contact de cette dernière avec ledit corps en matière absorbante. De la sorte, l'électrolyte, dès sa sortie de l'amenée d'électrolyte, parvient directement sur le corps en matière absorbante pour se répandre uniformément dans toute la masse de ce corps. En outre, ladite sortie d'électrolyte prend naissance dans ledit espace de préférence au voisinage dudit corps en matière absorbante.According to one embodiment of the device of the invention, said electrolyte supply opens into said space in the vicinity of said body of absorbent material, it being specified that the electrolyte supply preferably comprises at least one bore made in the electrode and opening onto the surface of this electrode, at the level of the zone of contact of the latter with said body of absorbent material. In this way, the electrolyte, as soon as it leaves the electrolyte supply, arrives directly on the body of absorbent material to spread uniformly throughout the mass of this body. In addition, said electrolyte outlet originates in said space preferably in the vicinity of said body of absorbent material.
Selon un autre mode de réalisation, l'amenée d'électrolyte et la sortie d'électrolyte comprennent chacune un tube souple et lesdites première et deuxième pompes sont des pompes péristaltiques qui comprennent plus précisément deux rotors pourvus de galets périphériques et montés axialement sur un arbre apte à être amené en rotation, les galets de l'un des rotors coopérant avec le tube souple de l'amenée d'électrolyte et les galets de l'autre rotor coopérant avec le tube souple de la sortie d'électrolyte, et les diamètres desdits rotors et/ou desdits tubes souples étant choisis pour créer ladite dépression dans ledit espace.According to another embodiment, the electrolyte supply and the electrolyte outlet each comprise a flexible tube and said first and second pumps are peristaltic pumps which more precisely comprise two rotors provided with peripheral rollers and mounted axially on a shaft suitable for being rotated, the rollers of one of the rotors cooperating with the flexible tube of the electrolyte supply and the rollers of the other rotor cooperating with the flexible tube of the electrolyte outlet, and the diameters of said rotors and / or said flexible tubes being chosen to create said depression in said space.
De la sorte, le débit de circulation dans l'amenée d'électrolyte et le débit dans la sortie d'électrolyte sont liés et figés une fois pour toutes. Ceci permet de s'affranchir de tout contrôle de débit au cours de l'utilisation du dispositif et ce dernier est immédiatement opérationnel sans qu'il y ait lieu de procéder à un quelconque réglage que ce soit. De plus, l'arrêt de l'amenée d'électrolyte et l'arrêt de la sortie de l'électrolyte peuvent être obtenus simultanément par une seule opération, c'est-à-dire simplement l'arrêt du moteur d'entraînement de l'arbre.In this way, the circulation flow in the electrolyte supply and the flow in the electrolyte outlet are linked and frozen once and for all. This eliminates any flow control during the use of the device and it is immediately operational without any need to make any adjustment whatsoever. Furthermore, the stopping of the electrolyte supply and the stopping of the electrolyte outlet can be obtained simultaneously by a single operation, that is to say simply stopping the drive motor of the tree.
La matière absorbante constituant le corps mis en oeuvre dans le dispositif de l'invention pourra notamment être en un matériau présentant des propriétés de résistance chimique à l'égard de l'électrolyte et de résistance thermique dans la plage de température de travail (de 15° C à 60° C). Cette matière devra en outre être non conductrice de l'électricité et perméable aux gaz et aux liquides ; enfin, elle devra être choisie pour ne pas rayer le substrat à traiter. Il pourra s'agir par exemple de ouate de polyester ou encore d'une matière textile, tissée ou non tissée, constituée de fibres ou de feutre de nylon.The absorbent material constituting the body used in the device of the invention may in particular be made of a material having properties of chemical resistance with respect to the electrolyte and of thermal resistance in the working temperature range (from 15 ° C to 60 ° C). This material must also be non-conductive of electricity and permeable to gases and liquids; finally, it must be chosen so as not to scratch the substrate to be treated. It may for example be polyester wadding or a textile material, woven or nonwoven, consisting of fibers or nylon felt.
On ajoutera que la source de courant électrique pourra être une source de courant pulsé ou de courant continu.It will be added that the source of electric current may be a source of pulsed current or direct current.
Le dispositif tel que défini ci-dessus permet la réalisation de tous types de traitements électrochimiques. Il pourra s'agir d'abord de la réalisation d'un dépôt électrolytique ; dans ce cas, le substrat à traiter constituera la cathode et l'électrode du dispositif constituera l'anode, cette électrode étant en un matériau insoluble dans les conditions de traitement. Il peut s'agir également d'un traitement de démétallisation faisant appel à un électrolyte de démétallisation, le substrat à traiter étant choisi comme anode et l'électrode du dispositif comme cathode. Il peut s'agir enfin d'un traitement d'anodisation de tout substrat à traiter constitué d'un matériau oxydable tel que l'aluminium, le titane et leurs alliages ; dans cette application, le substrat à traiter sera choisi comme anode et l'électrode du dispositif comme cathode.The device as defined above allows the realization of all types of electrochemical treatments. It may first be the production of an electrolytic deposit; in this case, the substrate to be treated will constitute the cathode and the electrode of the device will constitute the anode, this electrode being made of a material insoluble under the treatment conditions. It may also be a demetallization treatment using a demetallization electrolyte, the substrate to be treated being chosen as the anode and the electrode of the device as the cathode. Finally, it may be an anodization treatment of any substrate to be treated consisting of an oxidizable material such as aluminum, titanium and their alloys; in this application, the substrate to be treated will be chosen as the anode and the electrode of the device as the cathode.
Un mode de réalisation de l'invention est décrit ci-après à titre d'exemple non limitatif en référence aux dessins annexés dont la figure 1 est une vue en coupe schématique du dispositif de traitement associé à une installation électrique schématisée et les figures 2 et 3 sont des représentations schématiques partielles des pompes péristaltiques mises en oeuvre dans un mode de réalisation préféré.An embodiment of the invention is described below by way of nonlimiting example with reference to the appended drawings in which FIG. 1 is a schematic sectional view of the treatment device associated with a schematic electrical installation and FIGS. 2 and 3 are partial schematic representations of the peristaltic pumps used in a preferred embodiment.
La figure 1 représente plus précisément un dispositif selon l'invention pour l'oxydation anodique permettant de préparer une surface S d'une pièce A en aluminium, avant collage.FIG. 1 shows more precisely a device according to the invention for anodic oxidation making it possible to prepare a surface S of an aluminum part A, before bonding.
Le dispositif selon l'invention comprend une enveloppe 1 présentant une paroi latérale 2, une paroi arrière 3 et une ouverture frontale 4 opposée à la paroi arrière 3. Cette enveloppe, qui est en matière isolante, par exemple en polypropylène ou PVDF, définit un espace interne 5 dans lequel est logée une cathode 6 en regard de l'ouverture 4. Cette cathode présente une face arrière 6a et une face avant 6b. Cette même cathode peut, par exemple, présenter une section transversale circulaire, carrée ou rectangulaire, la surface cathodique utile pouvant varier de quelques mm² à quelques cm². La cathode 6 est par ailleurs maintenue dans l'espace 5 par tous moyens et notamment par fixation, par sa face arrière 6a, à la paroi arrière de l'enveloppe 1. D'autre part, la cathode 6 présente des dimensions telles que d'une part, elle délimite avec la face intérieure de la paroi latérale 2 de l'enveloppe 1 une chambre périphérique continue et que, d'autre part, cette face avant 6b soit située à une certaine distance de l'ouverture 4. La cathode 6 est reliée à la borne "moins" 7 d'un générateur G de courant, notamment de courant pulsé, dont la borne "plus" 8 est reliée à un point 9 de la pièce à traiter A. En outre, la cathode 6 est pourvue d'un perçage 10 prenant naissance sur sa face arrière 6a et débouchant sur sa face avant 6b ; bien qu'un seul perçage soit représenté sur la figure 1, il est avantageux de prévoir plusieurs perçages disposés dans la cathode de manière qu'ils débouchent de manière uniforme sur toute la face avant 6a. Ce ou ces perçages sont reliés, au niveau de la face arrière 6a de l'électrode, par un raccord 11, à un conduit 12 d'amenée d'électrolyte.The device according to the invention comprises an envelope 1 having a
La paroi 2 de l'enveloppe 1 est en outre pourvue d'un perçage 13 s'étendant de la face intérieure de cette paroi 2 jusqu'à la face extérieure de cette dernière où elle est reliée par un raccord 14 à un conduit 15 d'évacuation d'électrolyte aboutissant à une réserve R d'électrolyte.The
Conformément à l'invention, l'ouverture 4 est obturée par un tampon de matière absorbante 16 dont l'épaisseur est choisie pour que d'une part, il soit en contact avec toute la face avant 6b de l'électrode 6 et d'autre part, fasse légèrement saillie hors de ladite ouverture, étant précisé que le perçage 13 sera réalisé de manière telle qu'il débouche dans l'espace 5 en un point suffisamment éloigné de l'ouverture 4 pour que ce point ne soit pas recouvert par ledit tampon 16. A titre d'exemple, cette épaisseur pourra être de 5 mm.According to the invention, the
Par ailleurs, le conduit 15 est relié à l'aspiration d'un pompe 17 dont le refoulement est relié à un conduit 18 qui communique avec la réserve R d'électrolyte.Furthermore, the
Quant au conduit 12, il est relié au refoulement d'une pompe 19 dont l'aspiration est reliée à un conduit 20 dont l'extrémité libre plonge dans l'électrolyte de la réserve R.As for the
Le fonctionnement du dispositif ainsi décrit est comme suit.The operation of the device thus described is as follows.
Les pompes 17 et 19 sont choisies pour avoir des débits respectifs permettant de créer une dépression à l'intérieur de l'enveloppe 1, c'est-à-dire dans la chambre périphérique définie par la face intérieure de la paroi latérale 2 et la surface externe de l'électrode 6. Ces débits sont notamment fonction de la surface de l'ouverture 4, de la nature du tampon 16 et de l'épaisseur de ce dernier et il sera aisé pour l'homme de métier de définir ces débits par quelques essais préalables. A titre indicatif, on notera que le rapport du débit de la pompe 17 au débit de la pompe 19 peut par exemple être d'environ 6.The
Le fonctionnement du dispositif ainsi décrit est comme suit.The operation of the device thus described is as follows.
Après dégraissage éventuel de la surface à traiter, les pompes 17 et 19 sont amenées en action. De la sorte, l'électrolyte E de la réserve R est aspiré par la pompe 19 et amené de la réserve R via le conduit 20, la pompe 19, le conduit 12 et le perçage 10 sur le tampon 16 qui se trouve ainsi imprégné par l'électrolyte. Le débit de la pompe 19 est choisi pour qu'une quantité suffisante d'électrolyte parvienne sur le tampon 16 afin de réaliser l'oxydation anodique dans de bonnes conditions. D'autre part, la pompe 17 est choisie pour avoir un débit permettant de créer, à l'intérieur de l'enveloppe 1, une dépression suffisante sans pour autant assécher le tampon 16. Sous l'effet de cette pompe 17, l'excédent d'électrolyte et une certaine quantité d'air aspiré au travers du tampon 16 sont évacués, via le perçage 13, le conduit 15, la pompe 17 et le conduit 18, vers la réserve E ; ainsi, tout écoulement d'électrolyte sur d'autres zones que celle à traiter est évité.After possible degreasing of the surface to be treated, the
Ensuite, on réalise la connexion de l'électrode 6 et de la pièce A au générateur G de courant. Le dispositif est alors opérationnel pour réaliser l'oxydation anodique et il suffit de déplacer ce dispositif, manuellement ou mécaniquement, sur la surface S à traiter et orthogonalement par rapport à cette surface.Next, the electrode 6 and the part A are connected to the current generator G. The device is then operational to carry out the anodic oxidation and it suffices to move this device, manually or mechanically, over the surface S to be treated and orthogonally with respect to this surface.
L'épaisseur de la couche d'oxyde déprendra notamment du nombre de passages du dispositif sur la zone à traiter et des paramètres électriques du générateur de courant G. Ces paramètres peuvent notamment être les suivants :
- courant : continu,
- tension : 60 V,
- intensité : de 0 à 15 A,
- densité : de 250 à 350 A/dm².
- current: continuous,
- voltage: 60 V,
- intensity: from 0 to 15 A,
- density: from 250 to 350 A / dm².
Selon l'invention, les deux pompes 17 et 19 sont de préférence des pompes péristaltiques représentées schématiquement et partiellement sur les figures 2 (vue en élévation) et 3 (vue en coupe selon la ligne III-III de la figure 2). Ces deux pompes comprennent deux rotors 21, 22 tous deux montés axialement sur un arbre commun 23 apte à être entraîné en rotation par un moteur d'entraînement (non représenté). Le rotor 21 comporte à sa périphérie trois galets 24, 25, 26 équidistants et le rotor 22 comporte à sa périphérie deux galets 27, 28 diamétralement opposés. Lesdites pompes comprennent par ailleurs une première surface d'appui, semi-circulaire 29 sur laquelle est appliqué un tube souple à section circulaire 30 reliant les conduits 12 et 20 représentés sur la figure 1, ainsi qu'une deuxième surface d'appui 31 sur laquelle est appliqué un tube souple à section circulaire 32 reliant les conduits 15 et 18 représentées sur la figure 1. Le rotor 21 est disposé et dimensionné en diamètre pour que ses galets 24-26 compriment le tube 30 sur la surface d'appui 29 en l'écrasant sur tout son diamètre, de sorte que lorsque le rotor 21 est amené en rotation, lesdits galets en se déplaçant le long du tube 30 font progresser l'électrolyte dans ce tube 30. De même, le rotor 22 est disposé et dimensionné en diamètre pour que ses galets 27, 28 compriment le tube 32 sur la surface d'appui 31 en l'écrasant sur tout son diamètre de sorte que lorsque le rotor 22 est amené en rotation, lesdits galets en se déplaçant le long du tube 32 font progresser l'électrolyte dans ce tube 32. Quant au sens de rotation de l'arbre 23, il est tel que l'électrolyte progresse dans le tube 30 du conduit 20 au conduit 12 et, dans le tube 32, du conduit 15 au conduit 18. Le diamètre des rotors 21 et 22 et/ou le diamètre des tubes souples 30, 32 sont par ailleurs choisis pour que le débit en sortie du tube 32 soit supérieur à celui en sortie du tube 30 de manière à créer une dépression au sein de l'espace intérieur 5. Ainsi, par exemple, et comme représenté sur les figures 2 et 3, le diamètre du rotor 22 et le diamètre du tube souple 32 sont supérieurs respectivement au diamètre du rotor 21 et au diamètre du tube souple 30.According to the invention, the two
On comprendra que les débits respectifs des deux pompes sont liés et figés une fois pour toute et que l'arrêt du moteur d'entraînement de l'arbre 23 permet d'interrompre simultanément l'alimentation en électrolyte du dispositif de traitement électrolytique et l'évacuation de l'excédent d'électrolyte et de l'air aspiré.It will be understood that the respective flow rates of the two pumps are linked and frozen once and for all and that stopping the drive motor of the
Le dispositif selon l'invention est apte à être mis en oeuvre sur des pièces de forme et volume les plus diverses, et ne se limite pas à des surfaces planes. Ainsi, il peut être utilisé sur des surfaces à traiter qui ont des dimensions de quelques centimètres carrés à quelques décimètres carrés ou au niveau de joints de tôles, plats ou en "marche d'escalier" ; ou encore sur des surfaces convexes ou des arêtes vives. Les surfaces à traiter peuvent en outre avoir toutes les inclinaisons ; on peut en particulier procéder à des retouches en plafond.The device according to the invention is suitable for being used on parts of the most diverse shape and volume, and is not limited to flat surfaces. Thus, it can be used on surfaces to be treated which have dimensions of a few square centimeters to a few square decimetres or at the level of sheet metal joints, flat or "staircase"; or on convex surfaces or sharp edges. The surfaces to be treated can also have all the inclinations; we can in particular carry out ceiling touch-ups.
On ajoutera que ces retouches de traitement électrochimique peuvent, selon l'invention, être réalisées soit en poste fixe dans un laboratoire ou dans un atelier, soit en poste mobile pour des interventions sur site. Dans ce dernier cas, on profitera avantageusement de l'absence totale d'écoulement hors du dispositif quelle que soit sa position (ceci en raison de la dépression créée par les deux pompes).It will be added that these touch-ups of electrochemical treatment can, according to the invention, be carried out either in a fixed station in a laboratory or in a workshop, or in a mobile station for interventions on site. In the latter case, advantage will be taken of the total absence of flow out of the device whatever its position (this due to the vacuum created by the two pumps).
Claims (7)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9315166 | 1993-12-16 | ||
| FR9315166A FR2714080B1 (en) | 1993-12-16 | 1993-12-16 | Device for the electrochemical, in particular localized, treatment of a conductive substrate. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0663461A1 true EP0663461A1 (en) | 1995-07-19 |
| EP0663461B1 EP0663461B1 (en) | 1997-05-02 |
Family
ID=9454021
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP94402891A Expired - Lifetime EP0663461B1 (en) | 1993-12-16 | 1994-12-15 | Apparatus for electrochemically treating in particular selectively a conducting workpiece |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5571389A (en) |
| EP (1) | EP0663461B1 (en) |
| DE (1) | DE69402952T2 (en) |
| FR (1) | FR2714080B1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6099715A (en) * | 1998-08-07 | 2000-08-08 | Frembgen; Fritz-Herbert | Method for electrochemical treatment, especially for polishing |
| WO2004003260A1 (en) * | 2002-07-01 | 2004-01-08 | Fronius International Gmbh | Electrochemical method for cleaning the surfaces of metallic work pieces and cleaning electrode |
| WO2013178959A1 (en) | 2012-06-01 | 2013-12-05 | Dalic | Device for electrochemical treatment, locally in particular, of a conductor substrate |
| GB2535805A (en) * | 2015-02-27 | 2016-08-31 | Biomet Uk Healthcare Ltd | Apparatus and method for selectively treating a surface of a component |
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| DE19809487A1 (en) * | 1998-03-06 | 1999-09-09 | Greising | Electroplating and electrolytic cleaning of restricted area especially of metal, e.g. on construction site |
| US6939447B2 (en) | 1998-04-06 | 2005-09-06 | Tdao Limited | Method of providing conductive tracks on a printed circuit and apparatus for use in carrying out the method |
| GB2336161B (en) | 1998-04-06 | 2003-03-26 | John Michael Lowe | Method of providing conductive tracks on a printed circuit and apparatus for use in carrying out the method |
| US6143156A (en) * | 1998-07-24 | 2000-11-07 | Cae Vanguard, Inc. | Electroplating method and apparatus |
| DE19848296A1 (en) * | 1998-10-12 | 2000-04-13 | Peter Van Treeck | Corrosion stable electrical connection clamp, useful in electrolytes such as seawater e.g. for cathodic protection, has contact faces sealed against a cable by an O-ring to prevent electrolyte penetration |
| JP2000232078A (en) * | 1999-02-10 | 2000-08-22 | Toshiba Corp | Plating method and apparatus |
| US6538714B1 (en) * | 1999-10-25 | 2003-03-25 | 3M Innovative Properties Company | Dual color guest-host polarizers and devices containing guest-host polarizers |
| IT1311147B1 (en) * | 1999-11-04 | 2002-03-04 | Edk Res Ag | CLEANING MACHINE LOCALIZED WITH CELL, ELECTROLYTIC AND / OR ADULTRASONIC, PICKLING AND / OR POLISHING |
| US20060263188A1 (en) * | 2005-05-03 | 2006-11-23 | Goldin Martin C | Water dispensing system |
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| WO2009108835A1 (en) * | 2008-02-27 | 2009-09-03 | Smith & Nephew, Inc. | Peristaltic pumping apparatus and method |
| CN103160891B (en) * | 2013-03-22 | 2015-08-12 | 北京联泰信科铁路信通技术有限公司 | The method and apparatus of rail iron rail level brush plating conducting metal |
| US9393759B2 (en) * | 2013-10-24 | 2016-07-19 | General Electric Company | Metal laminate structures with systems and methods for treating |
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| DE102018109531A1 (en) * | 2018-04-20 | 2019-10-24 | Christian-Albrechts-Universität Zu Kiel | Adhesive joining device and adhesive joining method for a metallic surface |
| CN109898112B (en) * | 2019-04-24 | 2020-07-21 | 温岭市中天自动化设备有限公司 | Automatic change electric brush plating device |
| WO2020264084A1 (en) | 2019-06-27 | 2020-12-30 | Boston Scientific Scimed, Inc. | Detection of an endoscope to a fluid management system |
| KR20220088485A (en) | 2019-10-30 | 2022-06-27 | 보스톤 싸이언티픽 리미티드 | fluid monitoring system |
| KR102254027B1 (en) * | 2019-11-28 | 2021-05-20 | (주)천우테크 | Portable electropolishing device for surface treatment inside large fixed stainless steel storage tanks |
| KR102355394B1 (en) * | 2020-03-09 | 2022-01-26 | (주)한국마루이 | Hand-held cathode structure and electrolytic-polishing apparatus including the same |
| US20220220628A1 (en) * | 2021-01-13 | 2022-07-14 | Corrdesa, LLC | Electrochemical treatment system |
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| DE3839223C2 (en) * | 1988-11-19 | 1994-10-20 | Degussa | Selective electroplating device |
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- 1993-12-16 FR FR9315166A patent/FR2714080B1/en not_active Expired - Lifetime
-
1994
- 1994-12-13 US US08/364,681 patent/US5571389A/en not_active Expired - Lifetime
- 1994-12-15 DE DE69402952T patent/DE69402952T2/en not_active Expired - Fee Related
- 1994-12-15 EP EP94402891A patent/EP0663461B1/en not_active Expired - Lifetime
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3294664A (en) * | 1963-09-03 | 1966-12-27 | Hoover Co | Electrolytic appliance for treating surfaces |
| WO1983003879A1 (en) * | 1982-04-26 | 1983-11-10 | Labsystems Oy | Liquid dispenser |
| WO1992022685A1 (en) * | 1991-06-11 | 1992-12-23 | Eesa Electroplating Engineers S.A. | Electrolytic coating cell |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6099715A (en) * | 1998-08-07 | 2000-08-08 | Frembgen; Fritz-Herbert | Method for electrochemical treatment, especially for polishing |
| WO2004003260A1 (en) * | 2002-07-01 | 2004-01-08 | Fronius International Gmbh | Electrochemical method for cleaning the surfaces of metallic work pieces and cleaning electrode |
| WO2013178959A1 (en) | 2012-06-01 | 2013-12-05 | Dalic | Device for electrochemical treatment, locally in particular, of a conductor substrate |
| FR2991343A1 (en) * | 2012-06-01 | 2013-12-06 | Dalic | DEVICE FOR THE ELECTROCHEMICAL TREATMENT, PARTICULARLY LOCALIZED, OF A CONDUCTIVE SUBSTRATE |
| US9863056B2 (en) | 2012-06-01 | 2018-01-09 | Dalic | Device for electrochemical treatment, locally in particular, of a conductor substrate |
| GB2535805A (en) * | 2015-02-27 | 2016-08-31 | Biomet Uk Healthcare Ltd | Apparatus and method for selectively treating a surface of a component |
Also Published As
| Publication number | Publication date |
|---|---|
| US5571389A (en) | 1996-11-05 |
| FR2714080A1 (en) | 1995-06-23 |
| DE69402952T2 (en) | 1997-11-27 |
| EP0663461B1 (en) | 1997-05-02 |
| FR2714080B1 (en) | 1996-03-01 |
| DE69402952D1 (en) | 1997-06-05 |
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