EP0065015B1 - Verfahren und Vorrichtung zum Behandeln von Oberflächen von Werkstücken - Google Patents

Verfahren und Vorrichtung zum Behandeln von Oberflächen von Werkstücken Download PDF

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Publication number
EP0065015B1
EP0065015B1 EP81103402A EP81103402A EP0065015B1 EP 0065015 B1 EP0065015 B1 EP 0065015B1 EP 81103402 A EP81103402 A EP 81103402A EP 81103402 A EP81103402 A EP 81103402A EP 0065015 B1 EP0065015 B1 EP 0065015B1
Authority
EP
European Patent Office
Prior art keywords
solution
gush
spraying
vessel
overflow
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
Application number
EP81103402A
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English (en)
French (fr)
Other versions
EP0065015A1 (de
Inventor
Yoshinobu Takahashi
Yasuo Tokushima
Kentaro Ogata
Mamoru Suzuki
Jyoji Ito
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.)
Toyota Motor Corp
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Toyota Motor Corp
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 Toyota Motor Corp filed Critical Toyota Motor Corp
Priority to DE8181103402T priority Critical patent/DE3176694D1/de
Priority to EP81103402A priority patent/EP0065015B1/de
Publication of EP0065015A1 publication Critical patent/EP0065015A1/de
Application granted granted Critical
Publication of EP0065015B1 publication Critical patent/EP0065015B1/de
Expired legal-status Critical Current

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Classifications

    • 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
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
    • B05C3/02—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material
    • B05C3/09—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material for treating separate articles
    • B05C3/10—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material for treating separate articles the articles being moved through the liquid or other fluent material
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals

Definitions

  • This invention relates to a methpd of treating the surface of an object with a zinc phosphate solution as well as to an apparatus therefor.
  • the EP-A-0 040 360, the FR-A-2 443 513 and the US-A-4 196 023 disclose methods and apparatus for surface treatments which are based upon combining the advantages of the spraying method as well as those of the dipping method.
  • the object-to-be-treated is subjected to gush-spraying during its being dipped and during and soon after being lifted up out of the liquid.
  • the FR-A-2 443 513 discloses to gush-spray the object immediately after its immersion whereas according to the US-A-4 196 023 the object-to-be-treated is pre-sprayed and then passed through the dipping bath.
  • the object-to-be-treated is pre-gush sprayed immediately before its being immersed and during its being immersed using the heat-controlled overflowed liquid of the liquid circus of the apparatus.
  • this embodiment relates to zinc phosphate treating as a preliminary treatment on an object-to-be-treated such as a car body when it is applied with coating.
  • an object-to-be-treated such as a car body when it is applied with coating.
  • the object is degreased with a trichloroethylene or alkaline solution, followed by water cleansing and contact with titanium phosphate solution as a second step.
  • nuclei for phosphate coating crystals are formed on the surface of the object.
  • An object 1 which has been applied with such surface preparation is conveyed, being suspended from a hanging conveyer 2 as shown in Fig. 1, from left to right for being dipped into treating liquid 4 at the left part of a treating vessel 3.
  • the object 1 is subject to gush-spraying of the treating liquid 4 from either one or both of a pair of gush-spraying pipes 5a, 5b (hereinafter called spraying pipe) with a suitable number of openings for spraying the liquid, the former (5a) being disposed over the surface of the liquid 4 at a position within 30 seconds before the dipping of the object 1 and the latter (5b) being immersed in the liquid 4 at a position within 60 seconds more preferably within 30 seconds after the dipping thereof. It is preferable that the gush-spraying of the liquid 4 from the spraying pipes 5a, 5b never fails to be carried out at least from either one side.
  • the position setting of the spraying pipe 5a within 30 seconds before dipping of the object 1 comes from an experimental data wherein if the object 1 sprayed with the liquid 4 is stayed in the air more than 30 seconds the crystal zinc phosphate becomes mixed crystal of bulky hopeite and phosphophyllite of low corrosion resistance. if the time duration is less than 30 seconds the crystal zinc phosphate comprises chiefly fine phosphophyllite and shows about 1.5 times as high corrosion resistance as the former.
  • the object 1 is transported in the treating vessel 3 from the initial step where it is dipped first toward the final stage where it is taken out of the liquid 4, covering the distance in 60 to 300 seconds, so as to be completely covered by the crystal zinc phosphate on the whole surface thereof in the meantime.
  • an overflow outlet 3a is formed for allowing the overflow of the liquid 4 therefrom, and the overflowed liquid 4 is recovered by an overflow tank 6, which is provided with a shelter plate 6a on the upper part thereof for preventing the mist or vapor of the liquid 4 from injuring the passing objects 1 thereover.
  • the liquid 4 recovered in the overflow tank 6 is returned, by virtue of a pump 8, by way of a return passage 7 or a conduit and either via a heat exchanger 9 having a proper heating medium flowing passage 9a for heating the returing liquid 4 up to a predetermined temperature or via a by-pass passage 7b by-passing the heat exchanger 9, to the gush-spraying pipes 5a, 5b and another gush-spraying pipe 10 disposed on the bottom of the treating vessel 3.
  • This series of the returning flow of the liquid 4 is greatly helpful in imparting a counterflow to the liquid 4 in the treating vessel 3 against the travelling direction of the conveyed objects 1 therein, which consequently contributes to giving uniform contact of the liquid with the conveyed objects 1.
  • gush-spraying pipe 11 On the right side, in Fig. 1, of the treating vessel 3, i.e., downstream of the travelling object another gush-spraying pipe 11 is disposed, which is supplied with the liquid by a branch passage 7a branched from the return passage 7, for gush-spraying the supplied liquid 4 so as to wash away sludge attached on the object, and recover the heat thereon. Soon after that still another gush-spraying pipe 12 washes away the remaining sludge on the object, and recovers the remaining heat therefrom for keeping the same cool and wet.
  • the zinc phosphate conversion coating formed on the surface of the object 1 in such a way is chiefly made of fine phosphophyllite, which makes the object 1 highly corrosion resistant being covered with a zinc phosphate conversion coating of uniform thickness in all places irrespective of the shape thereof.
  • Fig. 2 which illustrates how the object 26 is dipped into the liquid
  • numeral 21 designates a treating vessel for containing the phosphate treating liquid.
  • the phosphate liquid as the chemical conversion liquid contained in the treating vessel 21, while being controlled at a predetermined level of phosphate concentration, is recycled at a flowing speed of V d in a direction shown with an arrow D.
  • an overflow tank 22 for the treating liquid disposed on the right side in Fig. 2 i.e., the side from which the object 26 is dipped, overflowed liquid from the treating vessel 21 is flowed into.
  • This liquid is recycled by way of a conduit 27, pumps P 1 , P 2 , and P 3 , etc., to the treating vessel 21 for the purpose of reutilization thereof and controlling the flowing speed of the treating liquid in the treating vessel 21.
  • Numeral 24 designates the surface of the treating liquid.
  • the object-to-be-treated 26, being a car body here which is conveyed from right to left by a hanging conveyor 23 in a direction shown with an arrow C, is begun to be dipped into the treating liquid at a point A in Fig. 2. At a point B it is horizontally positioned in a completely dipped state while being continuously shifted leftwardly in the liquid.

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  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Treatment Of Metals (AREA)

Claims (6)

1. Verfahren zur Oberflächenbehandlung eines Werkstücks, das von einem ersten Ende eines Behandlungsbehälters, der mit einer Zink-Phosphat-Lösung gefüllt ist, kontinuierlich durch die Zink-Phosphat-Lösung zu einem zweiten Ende des Behanglungsbehälters bewegt wird, wobei der Behandlungsbehälter mit einem Überlaufauslaß versehen ist, der nahe dem ersten Ende angeordnet ist, so daß die Überlauflösung in einem Uberlauftank aufgenommen werden kann, wobei das Verfahren umfaßt:
(1) das Verwenden eines abgedeckten Überlauftanks,
(2) das Sprühen der Überlauflösung gegen das Werkstück mittels eines Sprührohres, das oberhalb der Oberfläche der Lösung im Behandlungsbehälter in einer Position angeordnet ist, die innerhalb von 30 Sekunden, bevor das Werkstück am ersten Ende des Behälters eintaucht, liegt,
(3) das Sprühen der Uberlauflösung gegen das Werkstück mittels eines Sprührohres, das in die Lösung an einer Position eingetaucht ist, die innerhalb von 30 Sekunden nach dem Eintauchen des Werkstücks liegt,
(4) das Erzeugen einer Gegenströmung für die Zink-Phosphat-Lösung im Behälter in entgegengesetzter Richtung zu der Bewegung des Werkstücks,
(5) das Sprühen der Überlauflösung gegen das Werkstück, während es am zweiten Ende des Behandlungsbehälters aus der Zink-Phosphat-Lösung herausgehoben wird, und
(6) die Wärmesteuerung der Überlauflösung aus dem Überlauftank, die für die Schritte des Sprühens 1., 2. und 4. verwendet wird.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Werkstück über seine gesamte Oberfläche vollständig mit einer Phosphatpassivierung bedeckt wird, während es in der Behandlungslösung in einem darin eingetauchten Zustand verlagert wird, was 60 bis 300 Sekunden dauert.
3. Verfahren nach Anspruch 1 oder 2, des weiteren gekennzeichnet durch den Schritt des Sprühens von Wasser gegen das Werkstück, um Schlamm, der am Werkstück nach dem Sprühen am zweiten Ende des Behandlungsbehälters verblieben ist, abzuwaschen und um das Werkstück kühl und naß zu halten.
4. Vorrichtung zur Oberflächenbehandlung eines Werkstücks (1) mittels dessen kontinuierlicher Bewegung durch eines Zink-Phosphat-Lösung (4), wobei die Vorrichtung umfaßt: einen Behandlungsbehälter (3), der mit der Lösung (4) gefüllt ist,
eine Vorrichtung zum Bewegen des Werkstücks (1) durch die Lösung (4) von einem ersten Ende zu einem zweiten Ende des Behandlungsbehälters (3),
einem Überlaufauslaß (3a), der nahe dem ersten Ende des Behandlungsbehälters (3) angeordnet ist,
einen abgedeckten Überlauftank (6), um die Überlauflösung aus dem Behandlungsbehälter (3) aufzunehmen,
einen Rückführungskanal (7), um die Überlauflösung (4) vom Überlauftank (6) zum Behandlungsbehälter (3) zurückzuführen und um im Behälter (3) in entgegengesetzter Richtung zur Bewegung des Werkstücks (1) eine Gegenströmung in der Zink-Phosphat-Lösung (4) zu erzeugen,
eine erste Sprühvorrichtung, die mit dem Rückführungskanal (7) verbunden ist und am ersten Ende des Behandlungsbehälters (3) angeordnet ist, um die Zink-Phosphat-Lösung (4) gegen das Werkstück (1) zu sprühen, wobei die erste Sprühvorrichtung ein Sprührohr (5a), das am ersten Ende des Behandlungsbehälters (3) und oberhalb der Oberfläche der lösung im Behälter in einer Position, die bei Betrieb innerhalb von 30 Sekunden vor dem Eintauchen des Werkstücks in Lösung liegt, angeordnet ist, und ein Sprührohr (5b),'das am ersten Ende des Behandlungsbehälters (3) und in die Lösung eingetaucht in einer Position angeordnet ist, die bei Betrieb 30 Sekunden nach dem Eintauchen des Werkstücks liegt,
eine zweite Sprühvorrichtung (11), die mit dem Rückführungskanal (7) verbunden ist und am zweiten Ende des Behandlungsbehälters (3) angeordnet ist, um die Überlauflösung zu versprühen, während das Werkstück (1) aus der Behandlungslösung herausgehoben wird, und
einen Wärmetauscher (9), der mit dem Rückführungskanal (7) verbunden ist.
5. Vorrichtung nach Anspruch 4, gekennzeichnet durch eine dritte Sprühvorrichtung (10), die mit dem Rückführungskanal (7) verbunden und am Boden des Behandlungsbehälters (3) angeordnet ist.
6. Vorrichtung nach Anspruch 4 oder 5, gekennzeichnet durch eine vierte Sprühvorrichtung (12), die nahe der zweiten Sprühvorrichtung (11) angeordnet ist, um Wasser gegen das Werkstück (1) zu sprühen, um Schlamm, der am Werkstück nach dem Besprühen mittels der zweiten Sprühvorrichtung (11) verblieben ist, abzuwaschen und um das Werkstück kühl und naß zu halten.
EP81103402A 1981-05-05 1981-05-05 Verfahren und Vorrichtung zum Behandeln von Oberflächen von Werkstücken Expired EP0065015B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE8181103402T DE3176694D1 (en) 1981-05-05 1981-05-05 Method of treating the surface of an object and apparatus therefor
EP81103402A EP0065015B1 (de) 1981-05-05 1981-05-05 Verfahren und Vorrichtung zum Behandeln von Oberflächen von Werkstücken

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP81103402A EP0065015B1 (de) 1981-05-05 1981-05-05 Verfahren und Vorrichtung zum Behandeln von Oberflächen von Werkstücken

Publications (2)

Publication Number Publication Date
EP0065015A1 EP0065015A1 (de) 1982-11-24
EP0065015B1 true EP0065015B1 (de) 1988-03-30

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EP81103402A Expired EP0065015B1 (de) 1981-05-05 1981-05-05 Verfahren und Vorrichtung zum Behandeln von Oberflächen von Werkstücken

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4432352A1 (de) * 1994-09-12 1996-03-14 Bayerische Motoren Werke Ag Verfahren zum Transportieren von Rohkarossen in Behandlungsbädern

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2735044B1 (fr) * 1995-06-07 1997-07-25 Air Liquide Appareillage de traitement d'objets solides par trempage dans un bain de liquide
US20040112522A1 (en) * 1998-10-30 2004-06-17 Ward Kerry T. Automated methods for making screen assemblies for vibratory separators
DE10109480A1 (de) * 2001-02-28 2002-09-05 Volkswagen Ag Verfahren zur Beschichtung einer Aluminiumoberfläche
JP2013126612A (ja) * 2011-12-16 2013-06-27 Nissin Kogyo Co Ltd 構造体の塗装方法および構造体

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4196023A (en) * 1974-03-25 1980-04-01 Carrier Drysys Limited Treating automobile bodies
JPS5576076A (en) * 1978-12-05 1980-06-07 Nippon Paint Co Ltd Immersion type phosphate-treating method and apparatus thereof
DE3162243D1 (en) * 1980-05-12 1984-03-22 Toyota Motor Co Ltd Apparatus for the surface treatment of an object

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
W. Ransch "Die Phosphatierung von Metallen", 1974, Lenze Verlag, pages 85,86,89 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4432352A1 (de) * 1994-09-12 1996-03-14 Bayerische Motoren Werke Ag Verfahren zum Transportieren von Rohkarossen in Behandlungsbädern

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DE3176694D1 (en) 1988-05-05
EP0065015A1 (de) 1982-11-24

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