US3361658A - Method of electrophoretic surface coating - Google Patents

Method of electrophoretic surface coating Download PDF

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Publication number
US3361658A
US3361658A US358003A US35800364A US3361658A US 3361658 A US3361658 A US 3361658A US 358003 A US358003 A US 358003A US 35800364 A US35800364 A US 35800364A US 3361658 A US3361658 A US 3361658A
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US
United States
Prior art keywords
articles
coating
liquid
article
vessel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US358003A
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English (en)
Inventor
Tanner Edward Butler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pinchin Johnson and Associates Ltd
Original Assignee
Pinchin Johnson and Associates Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Pinchin Johnson and Associates Ltd filed Critical Pinchin Johnson and Associates Ltd
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Publication of US3361658A publication Critical patent/US3361658A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • 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
    • C25D13/04—Electrophoretic coating characterised by the process with organic material
    • 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

  • This invention relates to the electrode/position of surface coatings.
  • One important aspect of the invention is the coating of metal articles by electrodeposition from water-thinnable paint media based on water-soluble synthetic resins, but the invention is also applicable to the electrodeposition of other media, for example natural or artificial rubber latices.
  • the paint medium used as the electrodeposition bath contains at least 1 percent by weight of an organic liquid having a water-solubility at 20 C. of not more than 5 percent, and preferably not more than 1 percent, by weight.
  • organic liquid having a water-solubility at 20 C. of not more than 5 percent, and preferably not more than 1 percent, by weight.
  • the present invention is directed to a novel method of electrodepositing the coating and in accordance with this invention, the article to be coated is made one electrode, as in previous practice, and the coating liquid used is directed on to the article as one or more liquid streams in which the other electrode, which can conveniently take the form of a wire, is inserted.
  • the li uid coating is contained within a vessel provided with one or more spouts so that the liquid can be poured out of the vessel in a corresponding number of streams.
  • the vessel and spouts may conveniently be constructed of non-conducting materials.
  • a wire, forming the cathode for example, is located within, and it necessary insulated from, each spout so that when the liquid is poured on to the anode article, the electrical circuit is completed by the stream of liquid between the wire and the article.
  • the coating builds up on the article until the article is insulated to such an extent that the electrical circuit is broken. I have obtained uniform coatings of water-thinnable paints on metal articles using a voltage of volts with a pouring distance of about half an inch.
  • the invention is illustrated in the accompanying drawing which shows an apparatus employing a moving carrier.
  • the liquid coating material is contained within a vessel 1 having a spout 2 near its lower end.
  • a moving metallic band 3 moving continuously round rollers 4, 5 on shafts 6 and 7 respectively, one of which is driven by means not shown.
  • a metal wire 8 is mounted within the spout 2 and passes from the spout through an insulated bush 9 to an electric supply 19 and the circuit is completed by a wire 11 connected to the shaft 6 of roller 4.
  • paint from vessel 1 passes as a stream via the spout 2 on to the moving band 3 thereby completing the electrical circuit to the band.
  • any number of similar vessels may be provided, for example transversely across a moving band.
  • small metal articles such as screws may be placed in shallow containers constructed of metal wire and the containers put on the band in a manner similar to that shown for the panel 12. If the vessel 1 and spout 2 are made of insulating material the bush 9 is not necessary.
  • the method of coating according to this invention avoids need for complicated apparatus for painting small articles where separate assembly of each article as an individual electrode is not possible. In addition, once each article is coated with the paint it becomes insulated and excessive buildup of coatings is avoided.
  • the process of this invention may be used to apply the paints described in my application Ser. No. 285,234.
  • the present invention is illustrated by the following example in which an apparatus as shown in the drawing was used.
  • the wire 8 in spout 2 was connected to the negative pole of a 180 volt electrical supply and the positive pole of the supply was connected to the shaft 6.
  • a paint having the same composition as that set out in Example 1 of my application Ser. No. 285,234 was circulated as described so that it was poured continuously on to metal plates on the band 3 at a distance of about half an inch (1.25 cm.) for two minutes.
  • the plates were then washed with water and stoved for half an hour at 325 to 350 F.
  • the finished plates were provided with a smooth glossy coating of substantially uniform thickness.
  • a method for coating small metal articles by electrodeposition from a fluid aqueous coating suspension which comprises placing said articles on a horizontally moving carrier, directing downwardly on said articles a stream of said suspension, said stream moving, in its downward course, in contact With an electrode; and establishing an electric circuit through said carrier, the articles to be coated, said fluid stream and said electrode.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paints Or Removers (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Electrostatic Spraying Apparatus (AREA)
US358003A 1963-04-10 1964-04-07 Method of electrophoretic surface coating Expired - Lifetime US3361658A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB14302/63A GB1080171A (en) 1963-04-10 1963-04-10 Improvements in electrophoretic coating of surfaces

Publications (1)

Publication Number Publication Date
US3361658A true US3361658A (en) 1968-01-02

Family

ID=10038723

Family Applications (1)

Application Number Title Priority Date Filing Date
US358003A Expired - Lifetime US3361658A (en) 1963-04-10 1964-04-07 Method of electrophoretic surface coating

Country Status (6)

Country Link
US (1) US3361658A (it)
BE (1) BE646437A (it)
DE (1) DE1261032B (it)
ES (1) ES298472A1 (it)
GB (1) GB1080171A (it)
NL (2) NL6403814A (it)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3658677A (en) * 1969-12-22 1972-04-25 American Can Co Electroflow method of electrocoating
US3898145A (en) * 1971-02-17 1975-08-05 Scm Corp Process for applying contrasting coatings to a workpiece
US3997418A (en) * 1972-11-09 1976-12-14 Aluminum Company Of America Electrophoretic coating
US20080050533A1 (en) * 2006-08-22 2008-02-28 Deere & Company, A Delaware Corporation Method and system for coating a workpiece
US20140313574A1 (en) * 2013-01-14 2014-10-23 South Dakota State University Nanoparticle films for use as solar cell back reflectors and other applications

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1535077A (en) * 1975-07-21 1978-12-06 Standard T Chemical Co Inc Method and apparatus for electrophoretic coating
EP0519262A1 (de) * 1991-06-21 1992-12-23 Siemens Aktiengesellschaft Einrichtung zum elektrophoretischen Auftrag eines Lackes auf plattenförmige Werkstoffe
US5223116A (en) * 1992-05-11 1993-06-29 Siemens Aktiengesellschaft Apparatus for electrophoretic application of a lacquer onto plate-shaped work pieces

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2576362A (en) * 1947-10-08 1951-11-27 Westinghouse Electric Corp Electrophoretic method of coating wire with graphite
US2843596A (en) * 1949-09-30 1958-07-15 Sylvania Electric Prod Apparatus for cataphoretic application of coatings
US3020224A (en) * 1958-04-24 1962-02-06 Philips Corp Method and device for applying electron-emissive coatings to coating-supports of indirectly heated thermionic cathodes of electric discharge tubes
US3219571A (en) * 1961-03-14 1965-11-23 Sylvania Electric Prod Electrophoretic coating apparatus
US3230162A (en) * 1963-08-14 1966-01-18 Ford Motor Co Electropainting process and paint binder concentrate composition therefor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2576362A (en) * 1947-10-08 1951-11-27 Westinghouse Electric Corp Electrophoretic method of coating wire with graphite
US2843596A (en) * 1949-09-30 1958-07-15 Sylvania Electric Prod Apparatus for cataphoretic application of coatings
US3020224A (en) * 1958-04-24 1962-02-06 Philips Corp Method and device for applying electron-emissive coatings to coating-supports of indirectly heated thermionic cathodes of electric discharge tubes
US3219571A (en) * 1961-03-14 1965-11-23 Sylvania Electric Prod Electrophoretic coating apparatus
US3230162A (en) * 1963-08-14 1966-01-18 Ford Motor Co Electropainting process and paint binder concentrate composition therefor

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3658677A (en) * 1969-12-22 1972-04-25 American Can Co Electroflow method of electrocoating
US3898145A (en) * 1971-02-17 1975-08-05 Scm Corp Process for applying contrasting coatings to a workpiece
US3997418A (en) * 1972-11-09 1976-12-14 Aluminum Company Of America Electrophoretic coating
US20080050533A1 (en) * 2006-08-22 2008-02-28 Deere & Company, A Delaware Corporation Method and system for coating a workpiece
US7887687B2 (en) 2006-08-22 2011-02-15 Deere & Company Method and system for coating a workpiece
US20140313574A1 (en) * 2013-01-14 2014-10-23 South Dakota State University Nanoparticle films for use as solar cell back reflectors and other applications

Also Published As

Publication number Publication date
BE646437A (it) 1964-07-31
DE1261032B (de) 1968-02-08
GB1080171A (en) 1967-08-23
ES298472A1 (es) 1964-07-01
NL6403814A (it) 1964-10-12
NL127473C (it)

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