EP0809720B1 - Pulsmoduliertes gleichspannungsapplikationsverfahren - Google Patents

Pulsmoduliertes gleichspannungsapplikationsverfahren Download PDF

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Publication number
EP0809720B1
EP0809720B1 EP96900953A EP96900953A EP0809720B1 EP 0809720 B1 EP0809720 B1 EP 0809720B1 EP 96900953 A EP96900953 A EP 96900953A EP 96900953 A EP96900953 A EP 96900953A EP 0809720 B1 EP0809720 B1 EP 0809720B1
Authority
EP
European Patent Office
Prior art keywords
voltage
pulse
process according
gleichsp
modulated
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
EP96900953A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0809720A1 (de
Inventor
Klaus Arlt
Karin Eckert
Margret Stockbrink
Rolf Schulte
Harald Berlin
Gerd Nienhaus
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.)
BASF Coatings GmbH
Original Assignee
BASF Coatings GmbH
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 BASF Coatings GmbH filed Critical BASF Coatings GmbH
Publication of EP0809720A1 publication Critical patent/EP0809720A1/de
Application granted granted Critical
Publication of EP0809720B1 publication Critical patent/EP0809720B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • C25D13/18—Electrophoretic coating characterised by the process using modulated, pulsed, or reversing current
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S204/00—Chemistry: electrical and wave energy
    • Y10S204/08—AC plus DC

Definitions

  • the present invention relates to a method and an apparatus for Coating objects using direct current.
  • the rectifier generators currently on the market point to this significant disadvantages. Depending on the design, they have one Ripple, which depends on the type and quality of rectification and smoothing of the AC input voltage depends (see Vincent, Journal of Coatings Technology Vol. 62, No. 785, June 1990). In addition, this residual ripple is load-dependent, i.e. one obtains a feedback about the coating process itself Ripple is then only interpreted as a disturbance.
  • US-A-3 702 813 describes coating objects using of direct current, the alternating current is superimposed, where among other things the ratio the current strengths can be selected so that a voltage always in the same direction prevails.
  • FR-A-1 534 494 also deals with the coating of objects and discloses various current profiles for this purpose. These either change theirs Direction or go back to zero, or there is a constant overlay of AC and DC instead.
  • the present invention has therefore set itself the task Device for electrochemically coating objects for To provide systematically with the paint film properties and the application properties can be influenced, e.g. at reduced outer layer thicknesses to get sufficient wrap, or to to achieve pre-networking in the application.
  • the adjustable AC voltage components are preferably generated from periodic signals, in particular harmonic vibrations (sine vibrations), which are readily available. According to the invention, it is possible through suitable circuits to subject the periodic signals to preprocessing, preferably blocking the negative voltage components or rectifying them.
  • the superimposition of the DC voltage with the AC voltage components can be switched on and off in an adjustable duty cycle.
  • the pulse modulation as a variation of the conventional coating method with pure direct current, can be limited to specific time segments of the coating, for example the beginning or the end.
  • the preferred duty cycles of On: Off are the ranges between 10: 1 and 1:10.
  • the duration of the "on" period in which pulse modulation takes place is between 10 ms and 100 s.
  • the DC voltages used according to the invention are in the Range from 0 to 500 V. Likewise, the ones that come to be superimposed AC components between 0 and 500 V.
  • the device according to the invention is however, not limited to this, so that a result can also be obtained AC voltage can be worked if this results in advantages.
  • AC voltage components are between 1 and 500 ms. This corresponds to a frequency of 1000 to 2 Hz Frequency worked, which results from the mains voltage, e.g. 50 Hz or their multiples.
  • a variant is a series connection of an alternating current (stell) transformer with a DC generator.
  • the pulse modulation can optionally be switched on in such a way that the Coupling the AC voltage components via a mechanical or electronic relay takes place.
  • the latter can be used to achieve a defined Duty cycle via a function generator (i.e. with low current) can be controlled.
  • the function generator can be a commercially available electronic device. It is preferably implemented as a programmable microprocessor system, particularly preferably by means of a computer with appropriate software, with an analog / digital converter for receiving the control voltage and an output unit for the trigger pulses.
  • a preferred use of the device according to the invention takes place in the Electro dip painting instead. This depends on the processing time amount of paint deposited directly from the amount of charge that has flowed - and thus indirectly from the immersion voltage. It should be noted that the so-called tear-off stress due to heating and boiling a gas layer arises, which can interrupt the flow of electricity. It is also important to have an even one and sufficient layer thickness of the lacquer even in inaccessible places to get, i.e. sufficient wrap with reduced outer layer thickness. The method according to the invention surprisingly becomes an optimized one Result in relation to this partly conflicting requirements achieved.
  • Pulse modulation with two pulse half-waves is set (frequency quasi 100 Hz, cf. Diagram a) in Figure 9).
  • the results are shown in Figure 5 and the Tables 1 and 2 (column 1) reproduced.
  • the Breaking tension determined by the peak tension reached.
  • the pulse proportion increased to 250 V.
  • peak voltages could be reached that are sometimes 40 - 50 V above that of a pure DC voltage separation.
  • Pulse modulation with a pulse half-wave was set (frequency quasi 50 Hz, cf. Diagram b) in Figure 9). The results are shown in FIG. 6 and in FIG Tables 1 and 2 (column 2) reproduced.
  • This effect already started with voltage pulses of 30 V and took off increasing pulse strength.
  • the difference increased with voltage pulses of 150 - 250 V. between the breakdown voltage of a DC voltage separation and the possible Voltage peaks to values of 70 - 80 V.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Electrostatic Spraying Apparatus (AREA)
EP96900953A 1995-01-27 1996-01-15 Pulsmoduliertes gleichspannungsapplikationsverfahren Expired - Lifetime EP0809720B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19502470 1995-01-27
DE19502470A DE19502470A1 (de) 1995-01-27 1995-01-27 Pulsmoduliertes Gleichspannungsapplikationsverfahren
PCT/EP1996/000138 WO1996023090A1 (de) 1995-01-27 1996-01-15 Pulsmoduliertes gleichspannungsapplikationsverfahren

Publications (2)

Publication Number Publication Date
EP0809720A1 EP0809720A1 (de) 1997-12-03
EP0809720B1 true EP0809720B1 (de) 2002-05-08

Family

ID=7752413

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96900953A Expired - Lifetime EP0809720B1 (de) 1995-01-27 1996-01-15 Pulsmoduliertes gleichspannungsapplikationsverfahren

Country Status (7)

Country Link
US (1) US6197179B1 (pt)
EP (1) EP0809720B1 (pt)
JP (1) JPH10513503A (pt)
BR (1) BR9606848A (pt)
DE (2) DE19502470A1 (pt)
ES (1) ES2176430T3 (pt)
WO (1) WO1996023090A1 (pt)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10325656C5 (de) * 2003-06-06 2007-12-27 Eisenmann Anlagenbau Gmbh & Co. Kg Elektrophoretische Tauchlackieranlage

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6946065B1 (en) * 1998-10-26 2005-09-20 Novellus Systems, Inc. Process for electroplating metal into microscopic recessed features
DE19912897A1 (de) * 1999-03-23 2000-09-28 Daimler Chrysler Ag Katalysator und Verfahren zur Herstellung eines Katalysators
US6777831B2 (en) * 2000-10-18 2004-08-17 Tecnu, Inc. Electrochemical processing power device
US6620303B2 (en) * 2001-05-21 2003-09-16 Hong Kong Polytechnic University Process for making nickel electroforms
US6746591B2 (en) * 2001-10-16 2004-06-08 Applied Materials Inc. ECP gap fill by modulating the voltate on the seed layer to increase copper concentration inside feature
DE102006044050A1 (de) * 2006-09-20 2008-04-03 Eisenmann Anlagenbau Gmbh & Co. Kg Verfahren zur elektrophoretischen Beschichtung von Werkstücken und Beschichtungsanlage
US10011917B2 (en) 2008-11-07 2018-07-03 Lam Research Corporation Control of current density in an electroplating apparatus
US11225727B2 (en) 2008-11-07 2022-01-18 Lam Research Corporation Control of current density in an electroplating apparatus
US9385035B2 (en) 2010-05-24 2016-07-05 Novellus Systems, Inc. Current ramping and current pulsing entry of substrates for electroplating
US9028666B2 (en) 2011-05-17 2015-05-12 Novellus Systems, Inc. Wetting wave front control for reduced air entrapment during wafer entry into electroplating bath
WO2020160531A1 (en) * 2019-02-01 2020-08-06 Lumishield Technologies Incorporated Methods and compositions for improved adherence of organic coatings to materials

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1534494A (fr) * 1967-08-21 1968-07-26 Peter Stoll Fa Procédé et dispositif pour le recouvrement par voie électrique d'objets électriquement conducteurs
DE1796176A1 (de) * 1967-09-14 1972-03-23 Sumitomo Electric Industries Isolierter Draht und Verfahren zu dessen Herstellung
US3702813A (en) * 1967-09-14 1972-11-14 Sumitomo Electric Industries Process of insulating wire by electrophoresis plus non-electrophoresis coating steps
US3579769A (en) * 1968-02-19 1971-05-25 Akira Matsushita Capacitors and production thereof
US3616434A (en) * 1968-04-18 1971-10-26 Novachrome Inc Apparatus with power source for plating
US3971708A (en) * 1971-07-08 1976-07-27 Scm Corporation Electrocoating process
JPS5852038B2 (ja) * 1980-03-26 1983-11-19 株式会社 日本軽金属総合研究所 着色アルミニウム材の製造法
US4478689A (en) * 1981-07-31 1984-10-23 The Boeing Company Automated alternating polarity direct current pulse electrolytic processing of metals
US4468293A (en) * 1982-03-05 1984-08-28 Olin Corporation Electrochemical treatment of copper for improving its bond strength
ATE160451T1 (de) * 1992-04-09 1997-12-15 Raychem Corp Elektroabscheidungsverfahren zum anbringen von mikroverkapseltem fluessigkristallmaterial auf elektroden
US5550104A (en) * 1994-09-09 1996-08-27 Davis, Joseph & Negley Electrodeposition process for forming superconducting ceramics

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10325656C5 (de) * 2003-06-06 2007-12-27 Eisenmann Anlagenbau Gmbh & Co. Kg Elektrophoretische Tauchlackieranlage

Also Published As

Publication number Publication date
US6197179B1 (en) 2001-03-06
JPH10513503A (ja) 1998-12-22
WO1996023090A1 (de) 1996-08-01
ES2176430T3 (es) 2002-12-01
EP0809720A1 (de) 1997-12-03
DE19502470A1 (de) 1996-08-01
DE59609188D1 (de) 2002-06-13
BR9606848A (pt) 1997-11-25

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