EP0998596A2 - Elektro-tauchbeschichtung - Google Patents
Elektro-tauchbeschichtungInfo
- Publication number
- EP0998596A2 EP0998596A2 EP98941352A EP98941352A EP0998596A2 EP 0998596 A2 EP0998596 A2 EP 0998596A2 EP 98941352 A EP98941352 A EP 98941352A EP 98941352 A EP98941352 A EP 98941352A EP 0998596 A2 EP0998596 A2 EP 0998596A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- coating
- coated
- dip
- elements
- electrically conductive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
- C25D17/10—Electrodes, e.g. composition, counter electrode
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/22—Servicing or operating apparatus or multistep processes
Definitions
- the invention is directed to a method for electro-immersion coating of electrically conductive elements, such as screws, nuts, washers or other small parts, the elements to be coated being positioned in, on or on a support element in a coating bath provided with at least one anode and cathode are.
- Electro-immersion coating or lacquering is known in different procedures, it often being necessary to clean the metallic support elements after the treatment in such a way that an electrically conductive, active metallic surface is exposed again. This is associated with a number of disadvantages, in particular large amounts of electro-dip lacquer, which is to be regarded as a valuable substance, are wasted. Cleaning, which is generally to be carried out with solvent, is comparatively complex and expensive, in addition, if it is carried out encapsulated in relation to the environment, and is also time-consuming.
- the object of the invention is therefore to provide a solution with which an electro-dip coating with anodes and cathodes or support elements can be carried out after an initial absorption of electro-dip lacquer can continue to be used without previous cleaning and without renewed absorption of electro-dip lacquer after the subsequent, repeated use.
- this object is achieved according to the invention in that the anode in a cathodic electro-dip coating or the cathode in an anodic dip-coating is coated with a lacquer which has been baked after the coating and then activated and / or was coated with an electrically conductive varnish, which then hardens at room temperature.
- the advantage of the present invention is that the anode and cathode are activated with dip coating in such a way that they are subsequently conductive for direct and alternating currents of different voltages.
- the anode or cathode and / or the support element are coated with a cathodic or anodic dip lacquer with a voltage until no more current flows, then the lacquer is baked or cured at room temperature and subsequently the coating of the Objects is activated by applying a DC or AC voltage, with in another embodiment, it can be provided that the support element is coated with objects to be coated after the dip lacquer coating, introduced into the dip lacquer and exposed to some high current surges, in particular direct current surges, for activation during the coating of the objects.
- Corrosion protection can also be provided according to the invention, such a method being characterized in one embodiment in that the anodes or cathodes are coated with a corrosion protection, for example a zinc dust paint, before the coating or the electro-dip coating and the subsequent activation of the coating. be coated.
- a corrosion protection for example a zinc dust paint
- the invention makes it possible, depending on the type of procedure, to operate the anodes or cathodes freely in the coating basin, ie outside of a dialysis cell. Nevertheless, the invention alternatively provides for the use of such a cell.
- these elements can also be designed according to the invention as plastic elements provided with metal coatings before the electro-dip coating, which are then used in the method according to the invention.
- a drum or a basket or a frame for hanging the articles to be coated can be used as supporting elements for bulk goods.
- a coating tape can also be used which has been painted and activated according to the procedure according to the invention.
- the supporting elements for the activation can expediently be provided with a very dense pack of electrically conductive objects, as is also provided by the invention in a further embodiment.
- FIGS. 1 and 2 show a cathodic dip coating device and an anodic dip coating device in a highly simplified representation in FIGS. 1 and 2, with some coating parameters of the dip coating being reproduced following the description.
- FIG. 1 shows an electrically conductive immersion basket 1 connected as a cathode with the material 6 to be coated shown as balls, the walls of the basin being equipped with anodes 3. It is possible, e.g. to apply a direct current of 20 V over a longer period of time, via a control device 5, high current surges, in the order of magnitude of 1,000 V, can be supplied to the basket 1 in order to activate the immersion lacquer layer deposited on the basket surface in such a way that it is used in subsequent treatment stages remains permanently electrically conductive, ie can act as a cathode. In the same way, the anodes 3 can be coated and the surfaces activated accordingly.
- lacquer As an example of a lacquer used here Let us give an epoxy resin-amine-melamine resin combination that is pigmented and water-dilutable. Some of the ingredients are l-methoxy-2-propanol, 2-butoxy-ethanol and 2-dimethylamino-ethanol. This is a liquid black lacquer.
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19731101 | 1997-07-19 | ||
DE19731101A DE19731101C1 (de) | 1997-07-19 | 1997-07-19 | Verfahren zur Elektro-Tauch-Beschichtung |
PCT/EP1998/004454 WO1999004064A2 (de) | 1997-07-19 | 1998-07-16 | Elektro-tauchbeschichtung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0998596A2 true EP0998596A2 (de) | 2000-05-10 |
EP0998596B1 EP0998596B1 (de) | 2003-01-15 |
Family
ID=7836285
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98941352A Expired - Lifetime EP0998596B1 (de) | 1997-07-19 | 1998-07-16 | Elektro-tauchbeschichtung |
Country Status (7)
Country | Link |
---|---|
US (1) | US6554988B1 (de) |
EP (1) | EP0998596B1 (de) |
AT (1) | ATE231196T1 (de) |
AU (1) | AU8976498A (de) |
DE (2) | DE19731101C1 (de) |
ES (1) | ES2186209T3 (de) |
WO (1) | WO1999004064A2 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10250471B3 (de) * | 2002-10-30 | 2004-04-01 | Lindal Ventil Gmbh | Anlage zur Antikorrosionsbehandlung von Ventiltellern für Spenderbehälter |
US20060032730A1 (en) * | 2004-08-13 | 2006-02-16 | Kaufman Paul J | Belt conveyor apparatus |
US7767070B2 (en) * | 2004-08-13 | 2010-08-03 | Ppg Industries Ohio, Inc. | Processes for coating of objects |
US7943028B2 (en) * | 2004-08-13 | 2011-05-17 | Ppg Industries Ohio, Inc. | Method for coating objects |
US7947160B2 (en) | 2004-08-13 | 2011-05-24 | Ppg Industries Ohio, Inc. | System for coating objects |
TWI412629B (zh) * | 2011-05-23 | 2013-10-21 | Univ Tatung | 電泳沉積裝置及電泳沉積方法 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3879277A (en) * | 1973-04-27 | 1975-04-22 | Armco Steel Corp | Method and apparatus for electropainting small articles |
US4668358A (en) * | 1986-05-14 | 1987-05-26 | Motor Wheel Corporation | Method and apparatus for use in surface treatment of conveyor supported workholders |
-
1997
- 1997-07-19 DE DE19731101A patent/DE19731101C1/de not_active Expired - Fee Related
-
1998
- 1998-07-16 ES ES98941352T patent/ES2186209T3/es not_active Expired - Lifetime
- 1998-07-16 DE DE59806949T patent/DE59806949D1/de not_active Expired - Fee Related
- 1998-07-16 AT AT98941352T patent/ATE231196T1/de not_active IP Right Cessation
- 1998-07-16 AU AU89764/98A patent/AU8976498A/en not_active Abandoned
- 1998-07-16 EP EP98941352A patent/EP0998596B1/de not_active Expired - Lifetime
- 1998-07-16 US US09/831,137 patent/US6554988B1/en not_active Expired - Fee Related
- 1998-07-16 WO PCT/EP1998/004454 patent/WO1999004064A2/de active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO9904064A2 * |
Also Published As
Publication number | Publication date |
---|---|
AU8976498A (en) | 1999-02-10 |
EP0998596B1 (de) | 2003-01-15 |
ATE231196T1 (de) | 2003-02-15 |
WO1999004064A2 (de) | 1999-01-28 |
ES2186209T3 (es) | 2003-05-01 |
DE59806949D1 (de) | 2003-02-20 |
DE19731101C1 (de) | 1998-08-06 |
WO1999004064A3 (de) | 1999-05-27 |
US6554988B1 (en) | 2003-04-29 |
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