DE102015122467A1 - Plant and method for treating workpieces - Google Patents

Abstract

The invention relates to a plant for treating workpieces, preferably a dip treatment plant, comprising a treatment tank (4) for receiving a treatment liquid, a device for generating an electromagnetic field (5) in the treatment tank (4), comprising a cathode system (12) and an anode system , and a transport device (3) for workpieces, wherein a workpiece with the cathode system (12) is electrically conductively coupled. According to the invention, a first anode system (13) is connected to the transport device (3). Preferably, the dip treatment plant as Tauchlackieranlage (1) for painting workpieces in the form of bodies (2) is formed.

Description

The present invention relates to a plant for treating workpieces, preferably a dip treatment plant, comprising a treatment vessel for receiving a treatment liquid and a device for generating an electromagnetic field in the treatment vessel. The device for generating an electromagnetic field comprises a cathode system and an anode system. Furthermore, the system comprises a transport device for workpieces, wherein a workpiece is electrically conductively coupled to the cathode system.

Such generic systems for the treatment of workpieces are known per se and comprise an anode system with usually a plurality of anode elements, which are arranged stationary or immovable in the treatment container during the treatment process. A workpiece to be treated passes through the anode elements by being moved through the treatment vessel by means of the transport device. In this case, an electromagnetic field is established between the workpiece, which is connected as a cathode, and the anode elements, which preferably causes ions located in the treatment liquid to deposit on the workpiece to be treated. A uniform and sufficiently strong field with a corresponding field line density generally leads to a uniform and sufficiently strong deposition on the workpiece. Due to geometric conditions, the field line density may be too low in certain areas of the workpiece. Depending on the workpiece, this may result in some cases in an insufficient treatment result.

The present invention has for its object to provide a system for treating workpieces, in which the electromagnetic field influenced locally and a more uniform treatment result can be achieved.

To achieve the object, a generic immersion treatment plant is proposed according to the invention, in which a first anode system is connected to the transport device.

The transport device comprises a drive unit, one or more movably configured transport trolleys and a conveyor line. By means of the drive unit, a transport carriage is moved along the conveying path.

On the trolley, a workpiece can be releasably fixed. Between the trolley and workpiece can optionally be provided a workpiece receiving device. The workpiece is then releasably fixed to this workpiece receiving device, and the workpiece receiving device is releasably or permanently fixed to the trolley.

The treatment liquid disposed in the treatment tank may comprise a plurality of ingredients, for example, water and a film former.

The device for generating an electromagnetic field comprises, in addition to the first anode system and the cathode system, a current / voltage supply unit for providing electrical current and / or electrical voltage, preferably direct electrical current and / or direct electrical voltage. The power / voltage supply unit is preferably stationary. First anode system, cathode system and power / voltage supply unit are in electrically conductive connection with each other. Optionally, this connection can be temporarily disconnected. When a direct current and / or a DC voltage is applied between the first anode system and the cathode system, ie between the electrode systems, and when the electrode systems are immersed in the treatment liquid, positively charged particles, in particular film-forming particles, pass through the electromagnetic field to the cathode-connected element Workpiece. There, by pH change due to an electrolytic decomposition of water precipitation of the film former particles, and thus a deposition on the workpiece.

The first anode system comprises at least one anode element and is preferably detachably connected to the transport device. In particular, the first anode system can be releasably fixed to a movably configured transport carriage and / or to a workpiece receiving device. Thereby, the first anode system can be moved together with the trolley through the dip treatment plant. The connection between the first anode system and transport carriage or workpiece receiving device can be solved at least temporarily, for example, for maintenance, repair and / or maintenance activities.

A fixed on the trolley workpiece is connected as a cathode. The workpiece and the first anode system are preferably fixed relative to one another.

In a further embodiment of the invention, the device for generating an electromagnetic field comprises an electrical contacting unit respectively for the cathode system and for the first anode system, wherein the cathode system and the first anode system are electrically separated from each other locally.

An electrical contacting unit comprises a stationary part and a movable part which at least temporarily communicate electrically with each other.

The stationary part can be designed as a busbar and be arranged along the conveying path, preferably parallel to a conveying direction.

The movable part is preferably designed as a contacting element and arranged on a trolley.

The electrical contacting unit can preferably produce an electrical connection between a movable transporting carriage and the stationarily formed current / voltage supply unit, in that the contacting element at least temporarily engages with its associated busbar.

Each electrode system has an electrical contacting unit assigned to it. The electrical contacting units of the cathode system, of the first anode system and possibly of further electrode systems are preferably structurally separated from one another electrically by insulation elements. In particular, an electric current based on negative charge carriers such as electrons preferably flows between oppositely charged electrode systems via the current / voltage supply unit. By contrast, an electric current flows between oppositely charged electrode systems based on positive charge carriers, such as film former particles, preferably through the treatment liquid.

Optionally, in the case of a dip treatment system according to the invention, provision may be made for the electrical connection to be established spatially and / or temporally offset by the electrical contacting units of two electrode systems.

In a further embodiment of the invention, the first anode system comprises an anode element which is designed as a free anode element.

A free anode element preferably comprises a metallic material in a rod-shaped, a cylindrical, a semicircular, a cuboidal and / or an angular shape. The surface of a free anode element is preferably in contact with the treatment liquid.

If an electrical voltage is applied to the electrode systems, preferably hydrogen ions and oxygen molecules are liberated at the free anode element by electrolytic decomposition of water.

In a further embodiment of the invention, a second anode system is provided, which is connected to the treatment vessel and comprises an anode element, which is formed as a dialysis cell element with an ion-selective membrane and an anolyte.

Such a second anode system comprises in particular a plurality of anode elements which are attached to an inner side of a wall of the treatment container. Preferably, a plurality of anode elements are provided successively on one or both longitudinal side walls and / or on a bottom wall of the treatment container in the conveying direction and / or in the vertical direction one above the other.

An anode element of the second anode system may be formed as a dialysis cell element. A dialysis cell element comprises an anode plate, an ion-selective membrane and an anolyte circuit. The ion-selective membrane selectively separates the anode sheet and the anolyte loop from the treatment liquid by relying largely only on anions, i. Negatively charged ions of the treatment liquid, passable, which are required for an electroneutrality at the anode.

The anode sheet is formed from a metallic material, preferably from a stainless steel alloy, and has a plate-shaped, planar, cuboid, round and / or half-round shape. Optionally, the same electrochemical reactions take place on the anode sheet as on an anode element and / or on a free anode element.

The anolyte circuit comprises, in addition to an anolyte liquid, a storage tank for anolyte liquid, an addition apparatus for fully demineralized water and a device for measuring the electrical conductivity of the anolyte liquid. The anolyte liquid is recirculated and the means for measuring electrical conductivity measures the pH of the anolyte liquid and controls the addition of deionized water to the anolyte liquid to maintain the desired pH.

The anolyte liquid is a liquid that contains ions and is therefore electrically conductive (ionic conductor). The ions move in an electric and / or electromagnetic field directed along the field lines. Thus, the anolyte fluid is one Electrolyte fluid, wherein the anolyte is associated with the anode and is located on the side of the ion-selective membrane on which the anode sheet is positioned. By means of the anolyte circuit, the protons (positively charged hydrogen atoms) forming in the electrolysis at the anode, which provide an acidic environment in the region of the anode, are neutralized and / or taken from the anolyte circuit. This allows the desired pH value to be set.

In a further embodiment of the invention, the free anode element comprises a stainless steel alloy, a titanium mixed oxide, an iridium oxide and / or a ruthenium oxide.

In particular, a free anode element is constructed from one of said metal compounds. Due to their material properties, these metal compounds are preferably able to undergo the different process stages of the treatment process, such as phosphating, cathodic dip-coating and drying.

A stainless steel alloy is preferably an alloy of the type 1.4408 and / or 1.4571.

In a further embodiment of the invention, the first anode system with the transport device and the second anode system is connected to the treatment vessel, wherein both anode systems are electrically connected to the power / voltage supply unit and together with the workpiece each form an electromagnetic field, which is local to a common superimpose electromagnetic field whose field lines between the anode systems and the workpiece.

The present invention further relates to a method for treating workpieces in a dip treatment plant.

The object of the present invention is to provide a method for treating workpieces in which the electromagnetic field is influenced locally and a more uniform treatment result can be achieved.

This object is achieved by a method for treating workpieces in a dip treatment plant, in which a workpiece is immersed in a treatment liquid in a first step. In a second step, an electromagnetic field is generated in the treatment liquid, which is at least partially moved with the workpiece. In a third step, particles from the treatment liquid are deposited on the surface of the workpiece. At the end of the treatment process, the workpiece is removed from the treatment liquid in a fourth step.

In the first method step, the workpiece, which is fixed on a trolley, moved by means of the transport device to the treatment tank and preferably completely immersed in the treatment liquid arranged therein. The immersion can be effected by a rotational movement about a preferably longitudinally or transversely to the conveying direction aligned axis of rotation. Alternatively or additionally, the immersion may be effected by a linear movement along a preferably vertically oriented (stroke) axis.

By switching on the power / voltage supply unit is formed in the second step in the treatment liquid between the oppositely charged electrode systems, for example, between the cathode system and the first anode system, an electric and / or electromagnetic field. Positively charged ions in the treatment liquid, preferably positively charged particles such as film former particles, migrate in this electromagnetic field in the direction of the negatively charged workpiece, which is connected here as a cathode and thus part of the cathode system, and are deposited there.

The second method step can begin and / or be completed at a time offset from the first method step. Optionally, it can be provided that the first method step is completed at the latest when the second method step begins. Alternatively, the two method steps may at least partially overlap.

The first anode system may be attached to the trolley and therefore be moved with this through the dipping treatment plant. Such a movable anode system and the cathode system with the workpiece connected as a cathode are preferably designed to be stationary relative to one another. The electromagnetic field that forms between the first anode system and the workpiece is therefore moved as a whole and in a substantially constant configuration, in particular substantially constant with respect to a course of the field lines, together with the trolley, first anode system and workpiece through the treatment liquid.

Optionally, a second anode system is provided, which is arranged largely stationary on the treatment container. Such a second anode system preferably comprises a plurality of anode elements, which on an inner side of the Treatment tank are arranged. With the movement of the workpiece through the treatment liquid, the electromagnetic field and the field line course between anode elements of the second anode system and the workpiece change.

As a result of the preferably complete immersion of the workpiece in the treatment liquid, a complete coating can also take place in cavities of the workpiece.

In a further embodiment of the invention, the electrical connections of two electrode systems with a power / voltage supply unit spatially and / or temporally offset from each other produced and / or interrupted.

This production and / or interruption of an electrical connection can take place, for example, with the aid of the busbars associated with the electrode systems, which are arranged along the conveying path and preferably parallel to the conveying direction. These busbars may be designed to have different lengths and / or start and / or end at different points along the conveying path. An electrical contacting of a moving along the conveyor trolley with two different lengths and / or longitudinally staggered busbars is then spatially and / or temporally offset from each other.

An electrical connection is made by electrical contacting of a contact element with a busbar associated therewith. For this purpose, the distance between the contact element and the busbar is reduced such that a current flow is possible. This can lead to physical contact between contact element and busbar.

Alternatively or additionally, when the breakdown voltage has been reached, a flow of current through ionization of the air can also take place without physical contact.

In a further embodiment of the invention, two electromagnetic fields are generated, which overlap locally and thereby form a common electric field whose field lines extend from two anode systems to the negatively charged workpiece, wherein positively charged treatment liquid particles in the common electromagnetic field along the field lines in the direction migrate the workpiece and deposited there.

In the drawings show:

1 in a schematic representation of a longitudinal section at the point I of 2 by a dip treatment plant according to a first embodiment;

2 in a schematic representation of a cross section at the point II of 1 and 3 through the dip treatment plant according to the first embodiment;

3 in a schematic representation of a side view of the dip treatment plant according to the first embodiment at the point III of 2 ;

4 in a schematic representation of a longitudinal section at the point IV of 5 by a dip treatment plant according to a second embodiment;

5 in a schematic representation of a cross section at the point V of 4 through the dip treatment plant according to the second embodiment;

6 in a schematic representation of a longitudinal section at the point VI of 7 by a dip treatment plant according to a third embodiment;

7 in a schematic representation of a cross section at the point VII of 6 and 8th through the dip treatment plant according to the third embodiment;

8th in a schematic representation of a side view of the dip treatment plant according to the third embodiment at the point VIII of 7 ,

Identical or functionally equivalent elements are provided with the same reference numerals in all figures.

In the 1 to 3 is a dip painting plant 1 trained dip treatment plant for painting workpieces in the form of bodies 2 shown according to a first embodiment. The Tauchlackieranlage includes a transport device 3 , a treatment container 4 and a device for generating an electromagnetic field 5 , By means of the transport device 3 can be a body to be painted 2 to the treatment tank 4 be moved on and through it. In the treatment tank 4 is a treatment liquid in the form of a liquid paint 6 arranged in which the body to be painted 2 can be dipped. With the help of the device for generating an electromagnetic field 5 is in liquid paint 6 an electromagnetic field generates, which is a deposition of the liquid paint 6 favored at the body surface.

The transport device 3 includes several trolleys 7 of which only one is shown, and a drive unit 8th , On a dolly 7 is a workpiece receiving device in the form of a skid 9 attached, and at the skid 9 is the body 2 established. With the help of the drive unit 8th becomes the dolly 7 including skid 9 and body 2 in a conveying direction 10 along a conveyor line 11 emotional.

The treatment tank 4 is designed as an elongated and upwardly open vessel and so with the liquid paint 6 filled that one body 2 from the top completely into the liquid paint 6 can be dipped. The filling level in the treatment tank 4 is chosen so that on the one hand a complete immersion of a body 2 is possible, and that, on the other hand, despite the displacement by the dipping body 2 exceeding the maximum filling level of the treatment tank 4 and a resulting overflow of the liquid paint 6 fail. A longitudinal direction of the treatment tank 4 , the conveying direction 10 and the conveyor line 11 are aligned largely parallel to each other.

The device for generating an electromagnetic field 5 includes a cathode system 12 , a first anode system 13 and a power / voltage supply unit 15 , The power / voltage unit 15 provides an electrical current and is at least temporarily and optionally switchable electrically conductive with the cathode system 12 and the first anode system 13 connected. Be the cathode system 12 and the first anode system 13 in the liquid paint 6 submerged, can with simultaneously switched on power / voltage supply unit 15 in liquid paint 6 between the electrode systems 12 . 13 an electromagnetic field can be formed.

The first anode system 13 comprises two anode elements 13a . 13b , which are formed as free anode elements. These are on the skid 9 fixed and between skid 9 and body 2 arranged, in particular between the skid 9 and a bottom of the body 2 ,

The cathode system 12 comprises a cathode element 12a , wherein the body as a cathode element 12a , thus connected as a cathode, and thereby at least temporarily and optionally switchable electrically with the power / voltage supply unit 15 communicates.

By the arrangement of the free anode elements between Skid 9 and body 2 can be preferred between the free anode elements and the underside of the body 2 Train field lines.

Both electrode systems 12 . 13 each have an electrical contacting unit 16 . 17 on, with an electrical circuit closed and / or interrupted and an electrically conductive connection can be made and / or interrupted. For this purpose, the first electrical contacting unit comprises 16 a stationary part in the form of a first busbar 16a and a movable part in the form of a first contacting element 16b , The second electrical contacting unit 17 also includes a stationary part in the form of a second busbar 17a and also a movable part in the form of a second contacting element 17b , Here are the first busbar 16a and the first contacting element 16b as well as the second busbar 17a and the second contacting element 17b each firmly assigned to each other. The two busbars 16a . 17a are along the conveyor line 11 and largely parallel to this next to the treatment tank 4 arranged and stand with the power / voltage unit 15 in electrical connection. The two contacting elements 16b . 17b are at the trolley 7 established. The first contacting element 16b stands with the first anode system 13 in electrical connection. The second contacting element 17b stands with the cathode system 12 , so here with the body 2 , in electrical connection. When the dolly 7 along the conveyor line 11 is moved, get the two contacting elements 16b . 17b at least temporarily, and preferably simultaneously with the respective associated busbar 16a . 17a engaged. This closes the electrical circuit.

The liquid paint 6 comprises, in addition to water and / or one or more organic solvents, at least one type of film-forming agent, at least one type of pigment and optionally one or more additives. The water and / or an organic solvent are used to set a suitable viscosity and electrical conductivity of the liquid paint 6 , Water and / or solvents preferably evaporate during a subsequent drying process, not shown. A film former favors the formation of a preferably closed film on the surface of the body 2 , wherein during the drying process by chemical and / or physical processes, a solid, usually polymeric coating is formed.

The dip painting facility 1 according to the first embodiment works as follows.

A skid 9 comes with a body fixed to it 2 on a dolly 7 arranged. The dolly 7 is subsequently by means of the drive unit 8th along the conveyor line 11 and along the treatment tank 4 through the dip painting facility 1 emotional. At the same time the body becomes 2 by rotation about a direction transverse to the conveying direction 10 aligned axis of rotation completely in the liquid paint 6 immersed. When submerged, the body becomes 2 through the treatment tank 4 emotional. By the translational movement of the trolley 7 along the conveyor line 11 arrive the contacting elements 16b . 17b the two electrode systems 12 . 13 preferably simultaneously engaged with their respective associated busbar 16a . 17a , This closes the electrical circuit and that of the power supply unit 15 Provided electric current can by the device for generating an electromagnetic field 5 flow. As a result of this current flow form in the liquid paint 6 Field lines extending between the two electrode systems, that is between cathode system 12 (= Body 2 ) and first anode system 13 , extend. Positively charged film former particles move along the field lines in the direction of the negatively charged body in this electromagnetic field 2 , On the surface of the body 2 The film former particles are precipitated and deposited. Among other things, this deposition process runs continuously as long as the body 2 in the liquid paint 6 submerged, the power / voltage unit 15 electrical power is provided and the electrical circuit is closed. This builds up a (paint) layer on the body 2 at the end of the process largely evenly and substantially completely covered. Then the body becomes 2 by renewed rotation about the axis of rotation from the liquid paint 6 emersed.

In one embodiment, not shown, the liquid paint in the treatment tank can be circulated continuously or temporarily by a circulation system. In this case, liquid paint is conveyed out of the treatment tank by means of a pump unit through a line system and returned to the treatment tank via a plurality of nozzle elements arranged in the treatment tank in a preferred flow direction. This material supply can be provided in the boundary layer between the body surface and liquid paint. In addition, heat generated by the flow of current can be removed from the treatment tank. In addition, sedimentation of solid components of the liquid paint can be reduced.

In another embodiment, not shown, a power control device may be provided on a trolley, with which the strength of an electric current and / or the amount of electrical voltage can be controlled, which are provided for a set on this trolley body. If several transport vehicles are provided in such a dip painting system, and if several or all of these transport vehicles each have a corresponding current control device, it is then possible to determine individually for each body how high current and voltage should be set.

In the 4 and 5 is a dip painting plant 1 shown according to a second embodiment. This differs from the Tauchlackieranlage according to the first embodiment primarily in that in addition to the first, on the trolley 7 fixed first anode system 13 a second anode system disposed stationarily in the treatment tank 14 is provided. The second anode system 14 is in an electrically conductive connection with the power / voltage supply unit 15 and includes 16 as dialysis cell elements 18 designed anode elements. These are arranged in the vertical direction and in the vertical direction at the same height, with eight of each on an inner side of each longitudinal side wall 19a . 19b of the treatment tank 4 are longitudinally arranged in a row and form a group. The two groups of dialysis cell elements 18 are opposite to the two longitudinal side walls 19a . 19b of the treatment tank 4 arranged. One on the one long side wall 19a arranged dialysis cell element and one on the other longitudinal side wall 19b arranged dialysis cell element 18 make up a couple. In conveying direction 10 eight such pairs are arranged one behind the other, so that a body 2 passing through the treatment tank 4 is conveyed, one after the other between the two dialysis cell elements 18 each pair is moved through. Between the dialysis cell elements 18 and the body connected as a cathode 2 An electromagnetic field is formed so that field lines run between the electrode systems.

A dialysis cell element 18 includes an anode sheet, an ion-selective membrane and an anolyte circuit. The ion-selective membrane selectively separates the anode sheet and the anolyte circuit from the liquid paint 6 largely by only for negatively charged particles of liquid paint 6 is passable.

The anode sheet is formed of a stainless steel alloy and designed plate-shaped.

The anolyte circuit comprises, in addition to an anolyte, a reservoir for Anolyte fluid, a fully desalted water addition device, and a device for measuring the electrical conductivity of the anolyte fluid. The anolyte liquid is recirculated with the means for measuring electrical conductivity measuring the pH of the anolyte liquid and controlling the addition of deionized water to the anolyte liquid to maintain the desired pH, which should be approximately between 2 and 3 ,

The anolyte liquid is a liquid that contains ions and is therefore electrically conductive (ionic conductor). The ions move in an electric and / or electromagnetic field directed along the field lines. Thus, the anolyte fluid is an electrolyte fluid, with the anolyte fluid associated with the anode and located on the side of the ion-selective membrane on which the anode plate is positioned. By means of the anolyte circuit, the protons (positively charged hydrogen atoms) forming in the electrolysis at the anode, which provide an acidic environment in the region of the anode, are neutralized and / or taken from the anolyte circuit. This adjusts the pH to the desired value of about pH = 2-3.

The dip painting facility 1 According to the second embodiment, it works much like the dip painting system according to the first embodiment, so that reference may be made to the statements there.

In contrast to the first exemplary embodiment, with the aid of the second anode system 14 the field lines of additional locations in the treatment tank 4 train out. As a result, the density of the field lines increases, and the distribution and orientation of the field lines can be better influenced. A higher density and better distribution of the field lines favor the migration of the charged film former particles in the electromagnetic field and ultimately their deposition on the body surface. In particular, by side surfaces of the body 2 be better coated, because the field lines, by the second anode system 14 go out, at least partially preferred on the side surfaces of the body 2 aligned while the field lines from the first anode system 13 go out, at least partially preferred to the underside of the body 2 are aligned.

In a further embodiment, not shown, two or more anode elements are provided in the vertical direction one above the other in a second anode system. Then, for example, in addition to the eight (first) pairs according to the second embodiment, eight further pairs are provided.

In a further embodiment, not shown, the electrical connections of the electrode systems with the power / voltage supply device are switchable. This can be used to influence between which electrode systems field lines can run. For example, it can be provided that one of two anode systems is temporarily disconnected from the power / voltage supply device, while the other anode system is electrically conductively connected to the power / voltage supply device.

In another embodiment, not shown, dialysis cell elements are arranged alternately on the two longitudinal side walls. If a dialysis cell element is arranged on one of the two longitudinal side walls, a dialysis cell element is offset on the other longitudinal side wall in the conveying direction.

In the 6 to 8th is a dip painting plant 1 illustrated according to a third embodiment. This differs from the Tauchlackieranlage according to the second embodiment primarily by the fact that the first anode system 13 in addition to the two between skid 9 and body 2 arranged anode elements 13a . 13b a third anode element 13c includes. This third anode element 13c is also designed as a free anode element and in the interior of the body 2 arranged. From this third anode element 13c From field lines can preferably to the surface of the interior of the body 2 train up. These field lines favor the deposition of charged liquid paint particles in the interior of the body 2 ,

In addition, the Tauchlackieranlage differs 1 according to the third embodiment of the Tauchlackieranlage according to the second embodiment in that the cathode system 12 assigned second busbar 17a and the first anode system 13 associated first busbar 16a are formed differently long. Here is the first busbar 16a shorter and starts at a section of the conveyor line 11 in the conveying direction 10 lies behind a section where the second busbar 17a starts. This makes it possible that the first contacting element 16b at a later time with the first busbar 16a engages as the second contacting element 17b with the second busbar 17a , In other words, two circuits are provided which can be closed at different times. Because the second anode system 14 with the cathode system 12 is in electrical communication, can between the second anode system 14 and the body 2 an electromagnetic field is generated earlier than between the first anode system 13 and the body 2 , Different areas of the body 2 can therefore be coated at different times and / or for different lengths of time.

In a further embodiment, not shown, arranged in the interior of the body third anode element is designed to be switchable, that is, the electrical connection of this anode element with the power / power supply unit can be manufactured and interrupted depending on demand.

LIST OF REFERENCE NUMBERS

1

dip coating

2

state coach

3

transport device

4

treatment tank

5

Device for generating an electromagnetic field

6

liquid paint

7

Dolly

8th

drive unit

9

Skid

10

conveying direction

11

conveyor line

12

cathode system

12a

cathode element

13

First anode system

13a, 13b, 13c

Anode elements of the first anode system

14

Second anode system

15

Current / voltage supply unit

16, 17

Electrical contacting units

16a, 17a

First, second busbar

16b, 17b

First, second contacting element

18

Dialysis cell element

19a, 19b

Longitudinal side walls

Claims (9)

Dipping treatment plant ( 1 ) for treating workpieces ( 2 ), with - a treatment container ( 4 ) for receiving a treatment liquid ( 6 ), - a device for generating an electromagnetic field ( 5 ) in the treatment container, comprising a cathode system ( 12 ) and an anode system ( 13 . 14 ), - a transport device ( 3 ) for workpieces, - wherein a workpiece with the cathode system is electrically conductively coupled, characterized in that a first anode system ( 13 ) is connected to the transport device. Dipping treatment plant according to claim 1, characterized in that the device for generating an electromagnetic field ( 5 ) an electrical contacting unit ( 16 . 17 ) each for the cathode system ( 12 ) and for the first anode system ( 13 ), wherein the cathode system and the first anode system are locally electrically separated from each other. Submersion treatment plant according to claim 1 or 2, characterized in that the first anode system ( 13 ) an anode element ( 13a . 13b . 13c ), which is formed as a free anode element. Submersion treatment plant according to one of claims 1 to 3, characterized in that a second anode system ( 14 ) is provided, which with the treatment container ( 4 ) and comprises an anode element serving as a dialysis cell element ( 18 ) is formed with an ion-selective membrane and an anolyte circuit. Dipping treatment plant according to one of claims 1 to 4, characterized in that the free anode element ( 13a . 13b . 13c ) comprises a stainless steel alloy, a titanium mixed oxide, an iridium oxide and / or a ruthenium oxide. Submersion treatment plant according to one of claims 1 to 5, characterized in that the first anode system ( 13 ) with the transport device ( 3 ) and the second anode system ( 14 ) with the treatment tank ( 4 ), both anode systems ( 13 . 14 ) with a power / voltage unit ( 15 ) are electrically connected and together with the workpiece ( 2 ) each form an electromagnetic field, which overlap locally to a common electromagnetic field whose field lines between the anode systems ( 13 . 14 ) and the workpiece. Process for treating workpieces in a dipping treatment plant ( 1 ), comprising the following method steps - immersing a workpiece ( 2 ) into a treatment liquid ( 6 ); - generating an electromagnetic field in the treatment liquid, which is at least partially moved with the workpiece; Separating particles from the treatment liquid at the surface of the workpiece; - Remove the workpiece from the treatment liquid. Method according to claim 6, characterized in that the electrical connections of two electrode systems ( 12 . 13 . 14 ) with a power / voltage unit ( 15 ) spatially and / or temporally staggered and / or interrupted. A method according to claim 7 or 8, characterized in that two electromagnetic fields are generated, which overlap locally and thereby form a common electric field whose field lines of two anode systems ( 13 . 14 ) from to the negatively charged workpiece ( 2 ), wherein positively charged treatment liquid particles migrate in the common electromagnetic field along the field lines in the direction of the workpiece and are deposited there.

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