DE102012017493B3 - Apparatus, system and method for the galvanic coating of material to be treated using an inner anode - Google Patents

Abstract

A device is designed for a galvanic coating of a material to be treated (8) which has a cavity (9) with an inner surface (51) to be coated. The device comprises a first frame part (11) with a first electrode (21) for holding and electrically contacting the material to be treated (8). The device comprises a second frame part (12) having a support (23) for a second electrode (22), wherein the support (23) is arranged to fix the second electrode (22) so that the second electrode (22) protrudes into the cavity (9) of the treated by the first electrode (21) treated material (8), without touching the material to be treated (8). The first frame part (11) and the second frame part (12) are mechanically connected to each other. The first electrode (21) and the second electrode (22) are electrically isolated from each other.

Description

The invention relates to a device, a system and a method for the galvanic coating of material to be treated, which has a cavity, in particular for galvanic coating using an acidic electrolyte, in particular using an acidic electrolyte for depositing an alloy, for. As an acid zinc-nickel electrolyte.

For coating of items to be treated, such as, for example, metalware or parts which have a conductive surface, in conventional coating methods, the item to be treated is introduced into a galvanic bath which is located in a treatment container. In the treatment container, metal anodes are arranged opposite the material to be treated. When a voltage is applied between metal anodes and items to be treated, a galvanic deposition of metal takes place on the item to be treated.

When the object to be treated is not only to be coated on an outer surface but has a cavity, such conventional methods may have shortcomings. For example, the geometry of the material to be treated can lead to a lower current density within the cavity of the material to be treated than at the outer surface, so that the amount of material or material thickness deposited on the inner surface of the material to be treated per area and time is smaller than on the outer surface of the material to be treated , In order to ensure a certain desired thickness of the coating also on the inner surface, it may be necessary to let the treatment process run longer than it would be necessary to reach the nominal layer thickness on the outer surface. This results in increased process costs. Also, a varying thickness of the coating may be undesirable for the subsequent use of the material to be treated.

The DE 103 08 731 B4 describes a method and a device for galvanic coating. A hollow body to be coated is immersed in an electrolyte. The hollow body is attached to a rack electrically isolated. An anode projects through an opening located in the hollow body into its interior.

The DE 43 30 346 C1 describes a device for anodizing of workpieces, in particular calipers. The workpieces each have a wear surface. In this case, each workpiece is assigned its own cathode, which can be introduced by lowering into the recess of the workpiece, in which the wear surface is located.

There is a need for galvanic coating devices, systems and methods which offer advantages in view of the above problems.

This object is achieved according to the invention by a device, a system and a method having the features specified in the independent claims. Further embodiments are defined in the dependent claims.

According to one embodiment, a device for the galvanic coating of a material to be treated, which has a cavity with an inner surface to be coated, is specified. The device is adapted for releasable coupling to a treatment tank. The device comprises a first frame part with a first electrode for holding and electrically contacting the material to be treated. The device comprises a support for a second electrode which projects into the cavity of the material to be treated held by the first electrode. The carrier is mechanically connected to the first frame part such that the carrier is electrically insulated from the first frame part. For this purpose, the carrier can be located on a second frame part, wherein the first and the second frame part are mechanically connected to each other and electrically isolated from each other. Thus, the first and second electrodes are electrically isolated from each other. By connecting the device to a suitable current / voltage source, the first electrode can be cathodically polarized and the second electrode can be anodically polarized, at least in the time average. The device can be designed so that a contact of the second electrode is avoided with the material to be treated. The device is preferably designed as a frame with the first frame part and the second frame part. The device is adapted for releasable coupling by suitable receptacles for holding the device to a treatment container. For treatment, the device is lowered with the material held thereon in the electrolyte-filled treatment container. It is held during the treatment of suitable shots and is contacted electrically. By the device, the material to be treated can be positioned in a galvanic bath, wherein an inner anode in the cavity comes into effect during the treatment. Through the inner anode, an efficient coating of the inner surface can be achieved.

The carrier may be attached to a second frame part. The first frame part and the second frame part can be mechanically rigidly connected to each other. The device may include electrically insulating connectors that rigidly secure the first frame member and the second frame member connect with each other. The frame parts and the carrier may consist of electrically conductive material and are electrically isolated from the bath electrolyte, z. B. by a coating.

The second electrode may be an anode. The second electrode may be a soluble anode or an insoluble anode. The anode may be attached to the carrier. Preferably, the anode is attached to the carrier so that it can be in a simple manner, for. B. with the help of pliers, assembled and disassembled, in particular destructive can be dismantled to allow a quick and cost-effective installation and removal. The attachment between anode and carrier is well electrically conductive. For this purpose, the anode may have a connecting piece and the carrier may have the matching counterpart. The attachment between anode and carrier can be a threaded connection. Then, the connector may have an internal thread and the counterpart an external thread. Other attachment mechanisms, such as a bayonet mechanism or detent locking mechanism, may also be used to secure the soluble anode to the second frame member in a non-destructively releasable manner.

The soluble anode and the carrier may be arranged to prevent liquid entry of the electrolyte into the counterpart of the carrier when mounted. The soluble anode and the carrier may have sealing surfaces which, upon attachment of the soluble anode to the carrier, engage each other such that passage of liquid of the electrolyte through the mutually coupled sealing surfaces is inhibited.

The device can be used for the galvanic coating of the material to be treated with a metal, for. As copper, nickel, zinc and tin, are used. The device can be used for the galvanic coating of the material to be treated with only one metal. The soluble anode can then consist of the metal.

The device can be used for a galvanic coating of the material to be treated with an alloy comprising at least a first metal and a second metal. In this case, a larger amount of the first metal than the second metal can be deposited on the material to be treated. The soluble anode may then consist of the second metal. The first metal can be zinc (Zn). The second metal may be nickel (Ni).

In addition to the inner anode, which projects into the cavity of the material to be treated, outer anodes can be mounted in the treatment container, for example at the edge of the treatment container. In this case, outer anodes of the first metal and outer anodes of the second metal may be mounted in the treatment vessel.

The first electrode may have a first longitudinal axis and the second electrode may have a second longitudinal axis. The direction of the first longitudinal axis may deviate from the horizontal such that the first electrode is directed obliquely upward in the treatment state. This allows a wedging of the material to be treated on the first electrode and thus a tight fit and a good electrical contact. The direction of the second longitudinal axis may be different from the direction of the first longitudinal axis. It is such that a homogeneous electric field is achieved at the cavity surface.

The first electrode may have a portion with a conical outer surface. For holding the material to be treated, a holding opening of the material to be treated can be guided over the conical outer surface of the first electrode.

The second electrode and the support for the second electrode may be dimensioned so that the electrically conductive surface of the second electrode extends out of the cavity of the material to be treated. An edge of the cavity may define a plane from which the electrically conductive surface of the second electrode protrudes outwardly by 10 to 30 mm, for example by 20 mm. The carrier may be designed so that it does not protrude into the cavity of the material to be treated.

The first frame part may comprise a first contact section electrically connected to the first electrode and configured for releasable coupling to a first mating contact. The second frame member may include a second contact portion configured for releasable coupling with a second mating contact, wherein the second contact portion is spaced from the first contact portion and electrically insulated from the first contact portion.

The first frame part may comprise a plurality of first electrodes. The plurality of first electrodes may each have the same orientation. A plurality of second electrodes, each acting as an inner anode, may be secured to the second frame member. The plurality of second electrodes may each have the same orientation. In this way, the simultaneous galvanic coating of several components is facilitated. In further embodiments, the relative positions of the first electrode and associated second electrode on the device may vary to facilitate the treatment of different components.

According to a further embodiment, a system for the galvanic coating of a material to be treated is specified, which comprises the device according to an embodiment of the invention and a treatment container. The treatment container comprises a device for mechanically supporting and electrically contacting the device with the material to be treated held thereon.

At the treatment container, the first and / or second mating contact may be attached. The first and / or second mating contact may be elastically deformable to ensure good electrical contact with the current / voltage feed.

In the treatment tank, outer anodes other than the inner anode may be attached. The outer anodes can be mounted completely outside the cavity of the material to be treated. External anodes of a first metal and outer anodes of a different second metal may be used. The first metal can be zinc (Zn). The second metal may be nickel (Ni). A number of outer anodes of the first metal may be larger than a number of outer anodes of the second metal. The second electrodes may be made of the second metal.

The outer anodes attached to the treatment tank and the second electrodes fixed to the second frame part and acting as inner anodes may be configured such that a surface area of the inner anodes is from 3 to 30%, more preferably from 5 to 20%, and most preferably from 7 to 15 % of the total surface area of the anodes used on the treatment tank.

The system may be configured such that, during operation, a current flowing through the second electrodes accounts for 3 to 30% of the total current flowing through the various anodes (inner anodes and outer anodes), in particular from 5 to 20% of the total across the various anodes flowing current and in particular from 7 to 15% of the total current flowing through the various anodes current.

The treatment tank may include means for circulating the galvanic bath in the treatment tank.

The device may be configured to be time sequentially attached to a plurality of treatment containers of the system. Several of the treatment containers may have mating contacts, which are designed for an electrically conductive connection with the contacts of the device.

The system may comprise the item to be treated, which is held on the device so that the second electrode protrudes into the cavity of the material to be treated, without touching the item to be treated.

According to a further embodiment, a method for the galvanic coating of a material to be treated, which has a cavity with an inner surface to be coated, is specified. The material to be treated is attached to a device. The device comprises a first frame part having a first electrode and a support for a second electrode mechanically connected to the first frame part, the first electrode and the second electrode being electrically insulated from one another on the device. The material to be treated is attached to the device so that it is held by the first electrode and that the second electrode protrudes into the cavity of the material to be treated. The device with the material to be treated held thereon is detachably attached to a treatment container such that the material to be treated is immersed in a galvanic bath.

Further features of the method and the effects achieved thereby correspond to the features of the device and of the system according to exemplary embodiments. The method may be performed with the apparatus or system of one embodiment.

In the method, a first voltage can be applied between the second electrode and the first electrode, or a first current can be fed in. A second voltage may be applied between outer anodes and the first electrode, or a second current may be supplied. First and second current or first and second voltage can be adjusted independently of each other via different power or voltage sources.

Embodiments of the invention may generally be used to coat metal parts or parts having a conductive surface.

The invention will be explained in more detail below with reference to preferred or advantageous embodiments with reference to the accompanying drawings.

1 is a perspective view of a system according to an embodiment.

2 is a plan view of a device according to an embodiment.

3 is a side view of the device of 2 ,

4 is a front perspective view of a part of the device of 2 ,

5 is a side perspective view of a part of the device of 2 ,

6 is a perspective view of a part of the device of 2 ,

7 is a sectional view through a support of the device of 2 ,

8th is an enlarged view of the carrier and the inner anode of the device of 2 when the inner anode is not attached to the carrier.

9 is a schematic sectional view through a material to be treated with a part of the device of 2 ,

10 is a plan view of contacts of the device of 2 and mating contacts for power supply.

11 is a schematic side view of a device according to another embodiment.

The embodiments are described in the context of a system for treating laundry in which several pieces of parts having a conductive surface are immersed in a galvanic bath. The apparatuses, systems and methods may generally be used for coating articles to be treated having a cavity with an inner surface and in which not only an outer surface but also the inner surface is to be provided with a coating. The coating may be a coating of a metal or an alloy of several metals. For example, the material to be treated can be provided with a coating of zinc (Zn) and nickel (Ni), preferably out of an acidic electrolyte, wherein a larger proportion of Zn is contained in the coating. However, devices, systems and methods are not limited to coating with these materials. In the figures, identical reference numerals denote identical elements.

1 is a perspective view of a system 1 for the galvanic coating of material to be treated according to one embodiment. The system 1 includes a treatment tank 2 and a device 10 , The device 10 is formed as a frame on which the material to be treated is held and which also acts as a support for one or more inner anodes, which protrude into a cavity of the material to be treated.

The treatment tank 2 is filled with a galvanic bath during operation. outside anodes 3 , z. B. soluble anodes are in the treatment tank 2 appropriate. The outer anodes 3 may be attached to an edge of the treatment tank. If the article to be treated is to be provided with a coating comprising an alloy of a first metal and a second metal, some of the outer anodes may 3 consist of the first metal and the remaining outer anodes 3 can consist of the second metal. For example, the first metal Zn and the second metal may be Ni. The material to be treated can be coated such that the coating comprises a larger amount of Zn and a smaller amount of Ni, for example 10% of Ni.

In addition to the outer anodes 3 be with the system 1 one or more inner anodes used. The inner anode protrudes into a cavity of the material to be treated. The inner anode is on the device 10 attached, which also has a cathode serving as the first electrode on which the material to be treated is held. The device 10 Can be reversibly solubilized with the treatment tank 2 coupled, a receiving device for holding and contacting the device 10 includes. For example, the device 10 on the treatment tank 2 be set, so that at the device 10 kept treated material is immersed in the galvanic bath. A cradle 4 of the treatment tank 2 can contact surfaces 5 have, on which the device 10 can be put on. A power supply may be via contacts on the device 10 and corresponding counter contacts 6 . 7 at the treatment tank 2 respectively. A power supply can be connected to the device 10 take place in two spatially separated locations. In this case, a potential difference between the inner anode attached to the device 10 is attached, and the cathode, which holds the material to be treated generates. The counter contact 6 with which, for example, the cathode of the device 10 can be drawn to a negative potential, and the mating contact 7 with which, for example, the inner anode can be drawn to a positive potential, can be attached to the treatment tank 2 be attached. The power supply of the external anodes is not shown. Embodiments of the device 10 Embodiments will be with reference to 2 to 11 described in more detail.

2 shows a plan view of the device 10 and 3 shows a side view of the device 10 , The device 10 acts as a frame for first electrodes used as cathodes holding the material to be treated, and for second electrodes used as inner anodes, which protrude into a cavity of the material to be treated.

The device 10 has a support beam 13 on. The support beam 13 has bearing surfaces 14 on that on contact surfaces 5 the cradle 4 can be hung up. contacts 16 . 17 for a power supply are on the device 10 intended.

Generally, the device comprises 10 a first frame part 11 and a second frame part 12 , The first frame part 11 and the second frame part 12 are mechanically connected to each other. The first frame part 11 and the second frame part 12 can be rigidly connected. The device 10 can have several connectors 15 include the first frame part 11 and the second frame part 12 rigidly connect with each other. The connectors 15 can consist of an electrically insulating material.

The first frame part 11 and the second frame part 12 can on their surface an electrically insulating coating, for. B. based on PTFE. However, such a coating leaves surfaces of the first electrodes described below 21 and second electrodes 22 exposed. Inside, the first frame part 11 and the second frame part 12 each an electrically conductive material, for. As copper, brass, titanium, on, which is an electrically conductive connection between the first contact 16 and the first electrodes acting as cathodes 21 or an electrically conductive connection between the second contact 17 and the second electrodes acting as inner anodes 22 manufactures. The first electrode 21 can be made of stainless steel. It can be soldered to the first frame.

The first frame part 11 has a first electrode 21 on. The first frame part 11 may be a plurality of first electrodes 21 exhibit. The first electrodes 21 are each set up to be treated 8th to keep. For example, a first electrode 21 in a corresponding passage opening or other recess of the material to be treated 8th be introduced so that the material to be treated 8th at the first electrode 21 is held. About the first electrode 21 can the material to be treated in the operation of the system 1 negative, ie cathodic, be polarized to perform a galvanic coating process.

On the second frame part 12 is at least a second electrode 22 attached. The second frame part 12 has at least one carrier 23 on. The second frame part 12 can be a plurality of carriers 23 exhibit. On the carrier 23 is a second electrode 22 attached. Overall, on the second frame part 12 several second electrodes 22 be attached. Every second electrode 22 can be a first electrode 21 be assigned. The second electrodes 22 act as internal anodes during operation. The second electrodes 22 are arranged so that a second electrode 22 each in a cavity of the material to be treated 8th protrudes, that at an associated first electrode 21 is held.

A power supply takes place during operation via the contacts 16 . 17 on the device and the associated mating contacts 6 . 7 at the treatment tank. One between the mating contacts 6 . 7 applied voltage can over the first frame part 11 and the second frame part 12 a potential difference between the first electrodes 21 and the second electrodes associated therewith 22 cause. All first electrodes 21 can be kept at the same negative electrical potential. All second electrodes 22 can be kept at the same positive electrical potential.

By using the second electrode 22 placed in the cavity of the material to be treated 8th protrudes, in the galvanic coating, a higher current density in the cavity of the material to be treated 8th be achieved. It may also be a more uniform thickness of the coating on inner and outer surfaces of the material to be treated 8th be achieved. By using the device 10 with the first frame part 11 and the second frame part 12 can be a simple and dimensionally stable arrangement of the inner anodes relative to the treated 8th be achieved.

The arrangement of the first electrode 21 and the second electrode 22 is for the area 19 from 3 in 4 and 5 more clearly shown in enlarged perspective views.

The material to be treated 8th has a cavity 9 on whose surface should also be provided with a coating. To the material to be treated 8th at the device 10 can attach, a recess 25 of the material to be treated 8th , For example, a through hole, via the first electrode 21 be guided. The material to be treated 8th becomes from the first electrode 21 held and contacted electrically. The first electrode 21 may have a section with a cone-shaped outer surface 24 exhibit. The material to be treated 8th can be held so that it is on the cone-shaped outer surface 24 is wedged. The material to be treated 8th so can from the first electrode 21 be held that a longitudinal axis of the recess 25 against a first longitudinal axis 31 the first electrode 21 is tilted.

The carrier 23 and the second electrode attached thereto 22 are arranged so that the second electrode 22 in the cavity 9 protrudes. The second electrode 22 is arranged so that they are the material to be treated 8th that from the assigned first electrode 21 is held, not touched. The second electrode 22 can be essentially centered in the cavity 9 protrude. But there are also other spatial arrangements possible.

The first electrode 21 can be a first longitudinal axis 31 exhibit. The second electrode 22 can the (in 7 shown) second longitudinal axis 32 exhibit. In use state of the device 10 Both the first longitudinal axis 31 as well as the second longitudinal axis 32 be tilted relative to a horizontal direction. The first longitudinal axis 31 and the second longitudinal axis 32 can have different directions.

If the material to be treated 8th should be provided with a coating comprising a first metal and a second metal, the second electrode 22 consist of the first metal or the second metal. If the material to be treated 8th is to be coated so that the coating comprises a larger proportion of the first metal and a smaller proportion of the second metal, the second electrode 22 consist of the second metal. The treatment tank 2 can have a larger number of external anodes 3 comprising the first metal than the second metal. The second electrode used as inner anode 22 may be made of the metal for which a smaller number of external anodes 3 attached to the treatment tank. The first metal may be, for example, Zn. The second metal may be Ni, for example.

The surface of the outer anodes 3 and the surface of the second electrodes acting as inner anodes 22 can with the system 1 be coordinated. The outer anodes 3 and the second electrodes 22 at the second frame part 12 are fixed, may be configured so that a surface of the inner anodes 22 from 3 to 30% of the total surface area of the anodes. The system 1 can be configured so that in operation via the second electrodes 22 flowing current accounts for 3 to 30% of the total of the various anodes (inner anodes 22 and external anodes 3 ) is flowing current.

The second electrodes 22 may be soluble in the electrolyte when the material to be treated is coated. The second electrodes 22 can so on the carriers 23 the second frame part 12 be connected with simple means, such. As a pair of pliers, non-destructively releasable with the carriers 23 coupled and can be attached to it. This becomes exemplary for a second electrode 22 with reference to 6 to 8th described in more detail. For a device 10 , at the several second electrodes 22 are attached, which are used as inner anodes, a corresponding configuration can be used several times.

6 shows a perspective view of a portion of the first frame part 11 , A surface of the first frame part 11 has an electrically insulating coating 18 on. The coating 18 can also have an outer surface of the carrier 23 cover. The carrier 23 however, has an electrically conductive surface for coupling to the second electrode 22 on. An end 26 of the carrier 23 can be positioned so that the end 26 not in the cavity 9 protrudes.

7 shows a sectional view along a longitudinal axis 32 the second electrode 22 and the vehicle 23 if the second electrode 22 on the carrier 23 is attached. 8th shows an enlarged view in a state in which the second electrode 22 not on the carrier 23 is attached.

The second electrode 22 and the carrier 23 have coupling means with which the second electrode 22 on the carrier 23 Can be fastened so that it is non-destructive again by the wearer 23 can be solved. This can be done by the second electrode 22 an internal thread 33 and the carrier 23 can have a matching external thread 34 exhibit. Other embodiments are possible. For example, the second electrode 22 have an external thread and the carrier 23 can have a corresponding internal thread. The attachment mechanism is configured to make an electrically conductive connection.

To protect the attachment mechanism, the wearer can 23 and the second electrode 22 Be designed to be a seal 24 train when the second electrode 22 on the carrier 23 is attached. The second electrode 22 can be a sealing surface 35 have at an axial end. The carrier 23 can be a corresponding sealing surface 36 have at an axial end. If the second electrode 22 with the carrier 23 connected, the sealing surfaces can 35 . 36 so come into contact with each other that a seal 24 is formed to prevent entry of electrolyte.

Due to the releasable attachment mechanism for attaching a soluble anode, the soluble anode can be easily replaced if necessary. In particular, the second electrodes 22 the device 10 be replaced by new soluble anodes.

The second electrode 22 does not have to be completely in the cavity 9 of the material to be treated 8th can be arranged, but can be out of the cavity 9 protrude.

9 shows a sectional view along the longitudinal axis of the second electrode 22 , The second electrode 22 protrudes into the cavity 9 into it. The cavity 9 has an inner surface as a lateral edge 51 of the material to be treated. The second electrode 22 is arranged so that it is from the material to be treated 8th is spaced and this does not touch. A section of the second electrode 22 who is the carrier 23 is adjacent, outside the cavity 9 be arranged. The second electrode 22 can by a length 53 from the cavity 9 sticking outwards. The length 53 can be considered as a distance between one end of the second electrode 22 and one level 52 be determined. The length 53 may for example be from 10 to 30 mm. Thus, a better deposition of metal, for example, at the edge of the cavity 9 be achieved.

10 illustrates a configuration of an electrically conductive connection between the contacts 16 . 17 the device 10 and the mating contacts 6 . 7 , In operation of the system 1 becomes a voltage between the second electrodes used as inner anodes 22 and the first electrodes used as cathodes 21 , who hold the material to be treated, about the device 10 created. The contacts 16 . 17 the device 10 become electrically conductive with the mating contacts 6 . 7 coupled to the treatment tank 2 can be attached. The mating contacts 6 . 7 can each be by resilient metal parts, eg. B. spring-loaded contact jaws 55 - 58 , be formed to measure inaccuracies of the contacts 16 . 17 compensate.

Devices with a first frame part 11 and a carrier 23 for an inner anode, as with reference to 1 to 10 can be used in a variety of systems for electroplating. In particular, the device can 10 used in systems comprising multiple treatment vessels. The device 10 with the treated material held thereon can be lifted from a treatment tank to another treatment tank.

11 is a schematic representation of a system 61 for galvanic coating.

The system 61 includes the treatment tank 2 and another treatment tank 62 , The further treatment tank 62 can be a power supply for the device 10 exhibit. The further treatment tank 62 can exterior anodes 63 include. Alternatively, the further treatment tank 62 be used for rinsing the material to be treated or for purely chemical treatment of the material to be treated. Additional treatment containers may be provided.

In operation of the system 61 becomes the device 10 at the treatment tank 2 appropriate. In the treatment tank 2 there is a galvanic bath 64 to a level 65 , For a subsequent treatment in the further treatment tank 62 becomes the device 10 to the further treatment tank 62 About lifted. In the further treatment tank 62 is a treatment liquid 66 to a level 67 dammed. The device 10 is so on the other treatment tank 62 attached that the material to be treated 8th into the treatment liquid 66 is immersed.

Modifications of the embodiment shown in the figures and described in detail can be realized in further embodiments.

While in the context of embodiments a device has been described in which the second electrodes can be mechanically detachably attached to the second frame part, in other embodiments the second electrodes can also be permanently connected to the second frame part. The carriers for the inner anodes can also be attached directly to the first frame part.

The device can also be configured such that it has only one second electrode acting as an inner anode and an associated first electrode.

While the cavity of the material to be treated may have a cylindrical shape, the devices and methods can also be used in other shaped cavities.

The shape of the second electrode may be adapted to the shape of the cavity to produce a homogeneous current density in the cavity. Thus, the electrode rod may have a thickening or be bent. Also, two or more second electrodes may be disposed in a cavity. Furthermore, the second electrode may also be partially surrounded by an insulating layer in order to reduce deposition at specific locations of the cavity.

The devices, systems and methods of the various embodiments can be used in the treatment of metalware or other parts having a conductive surface that has a cavity. An example of such items to be treated is a caliper. Devices, systems and methods according to the various embodiments can be used in particular for the galvanic coating of material to be treated, which has an inner surface to be coated.

LIST OF REFERENCE NUMBERS

1

System for galvanic coating

2

treatment tank

3

outside anode

4

cradle

5

contact surface

6, 7

countercontact

8th

treated

9

cavity

10

Device for a galvanic coating

11

first frame part

12

second frame part

13

beams

14

bearing surface

15

joint

16, 17

Contact

18

insulating coating

19

enlarged area

21

first electrode

22

second electrode

23

carrier

24

Section with cone-shaped outer surface

25

recess

26

End of the carrier

31

first longitudinal axis of the first electrode

32

second longitudinal axis of the second electrode

33

inner thread

34

external thread

35, 36

sealing surface

51

to be coated inside surface

52

edge plane

53

length

55-58

Contact baking

61

System for galvanic coating

62

further treatment tank

63

outside anodes

64

galvanic bath

65

level

66

treatment liquid

67

level

Claims (10)

Device for a galvanic coating of a material to be treated ( 8th ), which has a cavity ( 9 ) with an inner surface to be coated ( 51 ), the device ( 10 ) for releasable coupling to a treatment tank ( 2 ) and comprises: a first frame part ( 11 ) with a first electrode ( 21 ) for holding and electrically contacting the material to be treated ( 8th ), and a carrier ( 23 ) for a second electrode ( 22 ), the carrier ( 23 ) is arranged to the second electrode ( 22 ) so that the second electrode ( 22 ) in the cavity ( 9 ) of the first electrode ( 21 ) treated material ( 8th protrudes, without the treated ( 8th ), wherein the first frame part ( 11 ) and the carrier ( 23 ) are mechanically connected to each other, and wherein the first electrode ( 21 ) and the second electrode ( 22 ) are electrically isolated from each other. Device according to claim 1, wherein the second electrode ( 22 ) is a soluble anode attached to the support ( 23 ) is attached. Apparatus according to claim 2, wherein the soluble anode comprises a connecting portion (Fig. 33 ) for a non-destructive detachable attachment to the carrier ( 23 ) having. Device according to claim 2 or claim 3, wherein the soluble anode and the carrier ( 23 ) are arranged to provide an electrically conductive region in a coupled state ( 34 ) of the carrier ( 23 ) to seal against ingress of liquid. Device according to one of the preceding claims, wherein the first electrode ( 21 ) a first longitudinal axis ( 31 ) and the second electrode ( 22 ) a second longitudinal axis ( 32 ) extending from the first longitudinal axis ( 31 ) is different. Device according to one of the preceding claims, wherein the device ( 10 ) one with the first electrode ( 21 ) electrically connected first contact section ( 16 ) which is for releasable coupling with a first mating contact ( 6 ), and wherein the device ( 10 ) one with the second electrode ( 22 ) electrically conductively connected second contact section ( 17 ) which is for releasable coupling with a second mating contact ( 7 ), wherein the second contact section ( 17 ) from the first contact section ( 16 ) and electrically against the first contact portion ( 16 ) is isolated. System for the galvanic coating of a material to be treated ( 8th ), comprising the device ( 10 ) according to claim 6 and a treatment container ( 2 ), at which the first mating contact ( 6 ) and the second mating contact ( 7 ), wherein the first mating contact ( 6 ) and / or the second mating contact ( 7 ) is elastically deformable. Process for the galvanic coating of a material to be treated ( 8th ), which has a cavity ( 9 ) with an inner surface to be coated ( 51 ), the method comprising: attaching the material to be treated ( 8th ) on a device ( 10 ), which is a first frame part ( 11 ) with a first electrode ( 21 ) and one with the first frame part ( 11 ) mechanically connected supports ( 23 ) with a second electrode ( 22 ), wherein the first electrode ( 21 ) and the second electrode ( 22 ) are electrically isolated from each other, wherein the treated ( 8th ) so on the device ( 10 ) is attached to the first electrode ( 21 ) and that the second electrode ( 22 ) in the cavity ( 9 ) of the material to be treated ( 8th protrudes, and releasably attaching the device ( 10 ) with the item to be treated ( 8th ) on a treatment tank ( 2 ) such that the material to be treated ( 8th ) in a galvanic bath ( 64 ) is immersed. The method of claim 8, wherein the second electrode ( 22 ) is a soluble anode, the method further comprising: replacing the soluble anode with another soluble anode. A method according to claim 8 or claim 9, wherein the method comprises 10 ) is carried out according to one of claims 1-6.

Images