EP0065015B1 - Procédé et appareil pour le traitement superficiel d'un object - Google Patents

Procédé et appareil pour le traitement superficiel d'un object 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
Other languages
German (de)
English (en)
Other versions
EP0065015A1 (fr
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
Original Assignee
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 EP81103402A priority Critical patent/EP0065015B1/fr
Priority to DE8181103402T priority patent/DE3176694D1/de
Publication of EP0065015A1 publication Critical patent/EP0065015A1/fr
Application granted granted Critical
Publication of EP0065015B1 publication Critical patent/EP0065015B1/fr
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. Un procédé de traitement de surface d'un objet dans lequel l'objet est déplacé en continu à travers une solution de phosphate de zinc à partir d'une première extémité d'un récipient de traitement rempli de cette solution jusqu'à une seconde extrémité du récipient de traitement, ledit récipient de traitement étant muni d'une sortie de débordement adjacente à ladite première extrémité afin de permettre à la solution de débordement d'être reçue dans un réservoir de débordement, ledit procédé comprenant:
(1) l'utilisation d'un réservoir de débordement couvert;
(2) la pulvérisation par jet de ladite solution de débordement sur ledit objet à l'aide d'une conduite de pulvérisation située au-dessus de la solution dans le récipient de traitement en un même endroit pendant 30 secondes avant le trempage de l'objet à ladite première extrémité dudit récipient;
(3) la pulvérisation par jet de ladite solution de débordement sur ledit objet à l'aide une conduite de pulvérisation immergée dans la solution au même endroit pendant 30 secondes après le trempage de l'objet;
(4) la création d'un contre-courant dans ladite solution de phosphate de zinc dans ledit récipient selon une direction opposée à celle du déplacement dudit objet;
(5) la pulvérisation par jet de ladite solution de débordement sur ledit objet lorsque ce dernier est retiré de ladite solution de phosphate de zinc à ladite seconde extrémité du récipient de traitement; et
(6) le contrôle de la température de ladite solution de débordement provenant dudit réservoir de débordement et utilisé pour les étapes 1, 2 et 4 de pulvérisation par jet.
2. Le procédé selon la revendication 1, dans lequel on couvre toute la surface dudit object d'un revêtement de conversion au phosphate en déplaçant ledit objet pendant 60 à 300 secondes dans ladite solution de traitement, à l'état immergé.
3. Le procédé selon la revendication 1 ou 2, comportant en outre une étape de pulvérisation d'eau sur ledit objet afin de chasser par lavage la boue restant sur l'objet après la pulvérisation par jet à ladite seconde extrémité du récipient de traitement et afin de maintenir l'objet à l'état froid et humide.
4. Un appareil pour le traitement de surface d'un objet (1) par déplacement continu de l'objet (1) à travers une sôlution de phosphate de zinc (4), ledit. appareil comprenant: un récipient de traitement (3) rempli de ladite solution (4); des moyens pour déplacer l'objet (1) à travers ladite solution (4) à partir d'une première extrémité dudit récipient de traitement (3) vers une seconde extrémité de ce récipient; une sortie de débordement (3a) adjacent à ladite première extrémité du récipient de traitement (3); un réservoir de débordement couvert (6) destiné à recevoir la solution de débordement en provenance dudit récipient de traitement (3); un conduit de retour (7) pour amener la solution de débordement (4) en provenance dudit réservoir de débordement (6) vers ledit récipient de traitement (3) et créer un écoulement à contrecourant de la solution de phosphate de zinc (4) dans le récipient (3) dans la direction opposée au déplacement de l'objet (1); de premiers moyens de pulvérisation par jet reliés audit passage de retour (7) et placés à ladite première extrémité du récipient de traitement (3) pour pulvériser ladite solution de phosphate de zinc (4) sur l'objet (1), lesdits premiers moyens de pulvérisation par jet comportant un tube de pulvérisation (5a) disposé à ladite première extrémité du récipient de traitement (3) et au-dessus de la surface de la solution contenue dans ledit récipient, dans une position correspondant, en service, à un laps de temps de 30 secondes avant l'immersion de l'objet dans ladite solution, et un tube de pulvérisation (5b) à ladite première extrémité du récipient de traitement (3) et immergé dans la solution dans une position correspondant, en service, à un laps de temps de 30 secondes après l'immersion de l'objet; des seconds moyens de pulvérisation par jet (11) reliés audit conduit de retour et disposés à ladite seconde extrémité du récipient de traitement (3) pour pulvériser la solution de débordement lorsque l'objet (1) est retiré de la solution de traitement (4); et un échangeur de chaleur (9) relié audit conduit de retour.
5. L'appareil selon la revendication 4, comportant des troisièmes moyens de pulvérisation par jet (10) reliés audit conduit de retour (7) et disposés au fond du récipient de traitement (3).
6. L'appareil tel que revendiqué dans la revendication 4 ou 5, comportant de quatrièmes moyens de pulvérisation par jet (12) adjacents auxdits seconds moyens de pulvérisation par jet (11) et servant à pulvériser de l'eau sur l'objet (1) afin de chasser par lavage la boue restant sur l'objet (1) après la pulvérisation effectuée par lesdits seconds moyens de pulvérisation (11) et afin de maintenir l'objet à l'état froid et humide.
EP81103402A 1981-05-05 1981-05-05 Procédé et appareil pour le traitement superficiel d'un object Expired EP0065015B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP81103402A EP0065015B1 (fr) 1981-05-05 1981-05-05 Procédé et appareil pour le traitement superficiel d'un object
DE8181103402T DE3176694D1 (en) 1981-05-05 1981-05-05 Method of treating the surface of an object and apparatus therefor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP81103402A EP0065015B1 (fr) 1981-05-05 1981-05-05 Procédé et appareil pour le traitement superficiel d'un object

Publications (2)

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

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EP81103402A Expired EP0065015B1 (fr) 1981-05-05 1981-05-05 Procédé et appareil pour le traitement superficiel d'un object

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EP (1) EP0065015B1 (fr)
DE (1) DE3176694D1 (fr)

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
EP0040369B1 (fr) * 1980-05-12 1984-02-15 Toyota Jidosha Kabushiki Kaisha Appareil pour le traitement superficiel d'un objet

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

Also Published As

Publication number Publication date
DE3176694D1 (en) 1988-05-05
EP0065015A1 (fr) 1982-11-24

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