EP3794167A1 - Nettoyage de châssis de transport dans une succession de processus de peinture électrophorétique par immersion - Google Patents

Nettoyage de châssis de transport dans une succession de processus de peinture électrophorétique par immersion

Info

Publication number
EP3794167A1
EP3794167A1 EP19720648.5A EP19720648A EP3794167A1 EP 3794167 A1 EP3794167 A1 EP 3794167A1 EP 19720648 A EP19720648 A EP 19720648A EP 3794167 A1 EP3794167 A1 EP 3794167A1
Authority
EP
European Patent Office
Prior art keywords
cleaning
coating
aqueous
component
conveyor frame
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
Application number
EP19720648.5A
Other languages
German (de)
English (en)
Other versions
EP3794167B1 (fr
Inventor
Jan-Willem Brouwer
Jens Kroemer
Frank-Oliver Pilarek
Fernando Jose RESANO ARTALEJO
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.)
Henkel AG and Co KGaA
Original Assignee
Henkel AG and Co KGaA
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 Henkel AG and Co KGaA filed Critical Henkel AG and Co KGaA
Publication of EP3794167A1 publication Critical patent/EP3794167A1/fr
Application granted granted Critical
Publication of EP3794167B1 publication Critical patent/EP3794167B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/20—Pretreatment
    • 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
    • C23C22/05—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 using aqueous solutions
    • C23C22/06—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 using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/07—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 using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
    • 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
    • C23C22/05—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 using aqueous solutions
    • C23C22/06—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 using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/07—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 using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
    • C23C22/08—Orthophosphates
    • C23C22/12—Orthophosphates containing zinc cations
    • 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
    • C23C22/73—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 characterised by the process
    • 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
    • C23C22/78—Pretreatment of the material to be coated
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
    • C23G1/19—Iron or steel
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/24—Cleaning or pickling metallic material with solutions or molten salts with neutral solutions
    • 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 present invention relates to a method for corrosion-protective coating of metallic components in series comprising a plurality of wet chemical treatment stages including a cathodic electrodeposition coating, which completes the coating process, in which each component received by a conveyor frame and the T ransportcruition consisting of component and conveyor frame then passed through all treatment stages is before the finished coated component separated from the conveyor frame and an uncoated component from the same conveyor frame is added to the coating, wherein in the process by incorporating an additional treatment stage before degreasing / cleaning and the subsequent passivation and electrocoating prevented the construction of massive paint deposits on the conveyor racks becomes.
  • the coating process of pretreatment to electrocoating in a single system can be operated economically, since the discharge of individual conveyor elements to remove paint deposits after incorporation of the pre-cleaning away.
  • effective removal of the coating constituents received from the cathodic electrodeposition coating is achieved by merely contacting the conveyor frames and thus also the components to be coated from the conveyor frame with an aqueous agent of suitable acidity containing phosphoric acid before the wet-chemical treatment stages for degreasing / cleaning, passivation and cathodic electrodeposition coating.
  • the corrosion-protective pretreatment of metallic components in particular consisting of the materials zinc, iron, steel, galvanized steel and / or aluminum, in a process sequence comprising a passivation, for example based on water-soluble phosphates or based on water-soluble compounds of the elements Zr, Ti and / or Si, followed by electrocoating has been established in the art for decades or basically known.
  • the passivation can bring about the formation of a crystalline conversion layer, for example a phosphate layer according to EP 2503025 or merely the formation of an amorphous coating, for example in the context of a zirconium phosphating according to EP 2215285.
  • the thus passivated metallic Components are usually transferred immediately after a sink in the treatment stage of electrocoating.
  • conveyor frames are used in the automotive industry to pick up the bodies and guide them through the treatment stages.
  • parts of the conveyor racks are brought into contact with the respective bath and rinsing solutions in the wet-chemical treatment stages.
  • the object of the present invention is therefore to improve the economy of a single-loop system in the anti-corrosive coating of metallic components in series including their cleaning / degreasing, passivation and cathodic electrodeposition by ensuring continuous operation of the coating system during series production.
  • This object is achieved in a method for corrosion-protective coating of metallic components in series comprising at least one cleaning / degreasing, a passivation and a cathodic electrodeposition coating respectively as wet-chemical treatment stages, wherein the treatment stage of the degreasing / cleaning always that of passivation in the process sequence to the anti-corrosive coating preceded and on the basis of an aqueous cleaning solution whose pH is above 6, and wherein the treatment step of the cathodic electrodeposition coating always follows that of the passivation in the process sequence to the anti-corrosive coating in which each pretreated component of the series of a conveyor frame, then the pair of transport consisting of component and conveyor frame guided by the wet-chemical treatment stages according to the process sequence and the transport pair only after the last treatment stage v separated from one another and a corrosion-protected coated component is discharged, and then the thus released conveyor frame receives a next component of the series to re-run the process sequence for the purpose of anti-corrosive coating, wherein the
  • a metallic component according to the present invention is when the component is at least partially composed of at least one metallic material, preferably zinc, Iron, aluminum and of the respective alloys, inasmuch as the aforementioned elements each form the main alloying constituent of more than 50 at.%, And of galvanized steel.
  • a corrosion-protective coating in series according to the present invention is when a plurality of metallic components passes through the wet-chemical treatment stages, wherein the coating of each component takes place successively and thus separated in time.
  • a sequence of processes for anticorrosive coating comprises a predetermined sequence of wet chemical treatment stages from the picking up of the component to be coated by the conveyor frame to removal of the now coated component for transfer to downstream treatment stages, for example the stoving stage, each individual wet chemical treatment stage providing the component and at least parts of the conveyor frame with an aqueous agent.
  • a conveyor frame is any device suitable for receiving, transporting and discharging the component, the suitability also being to be able to guide the component through the spatially separate wet-chemical treatment stages in accordance with the process sequence according to the invention and as little as possible To deliver material both in the treatment stages as well as from the treatment stages. Therefore, conveyor frames are preferably manufactured from materials inert to the media applied in the treatment stages, for example stainless steel, and have an external design which minimizes the scooping of media from the respective treatment stage into the respectively subsequent one.
  • a transport pair is realized in the context of the present invention and that until the component for further treatment outside the process sequence according to the invention for anti-corrosive coating to a next facility, especially conveyor frame system, eg. For baking the electrocoating, pass and is discharged with it.
  • the conveyor frame is released as soon as the corrosion-resistant coated metallic component has been discharged in accordance with the process sequence and can take up another metallic component to be coated in a way that is to be protected against corrosion.
  • a plurality of conveyor racks is used, preferably the number of conveyor racks at least equal to the number of wet-chemical treatment stages.
  • the total acid content in points is determined in the context of the present invention by diluting 10 ml of the aqueous prepurification agent to 50 ml and titrating with 0.1 N sodium hydroxide solution to a pH of 8.5.
  • the consumption of milliliters of caustic soda indicates the total acid score.
  • the pH value corresponds to the negative decadic logarithm of the activity of the hydronium ions measured by means of pH-sensitive glass electrodes at 20 ° C. after their calibration with pH buffer solutions suitable for the pH range in question.
  • each conveyor frame is effectively freed of binder and pigment residues after the next component to be coated has been re-run through all treatment stages required for coating.
  • a separate maintenance of the conveyor racks for the removal of firmly adhering electrodeposition paint residues is no longer required so that selbige can go through all the wet chemical treatment stages repeatedly in a coating system and in this way the advantages of operating with only one conveyor frame system can be fully utilized.
  • the pre-cleaning is tuned in the process of the invention on the type of electrocoating and requires an acidic aqueous agent for detachment of cathodic dipping paint residues from the conveyor racks in the pre-cleaning.
  • An electrodeposition coating in the context of the present invention characterizes a wet-chemical treatment stage in the course of which a curable lacquer coagulate is deposited on the metallic component by applying an electrical voltage, which is filmed and cured in a subsequent treatment stage by baking.
  • the electrodeposition coating is preferably based on an aqueous agent containing at least one dispersed one organic resin in an amount of at least 1% by weight based on the aqueous agent.
  • the electrocoat material can be deposited by cathophoresis, that is to say by applying an electrical voltage in which the metallic component to be coated for corrosion protection is connected as a cathode.
  • cathodic electrodeposition coating in which an alkaline pH shift at the interface to the metallic component causes the coagulation of the dispersed resin particles and thus the film formation on the component.
  • the cathodic electrodeposition coating is established in particular for the corrosion-protective coating of passivated, for example zinc phosphated or coated with amorphous conversion layers metallic components and is operated by default in the coating of automobile bodies.
  • an epoxy resin as a binder which in turn is preferably selected from amine-modified polyepoxides, used for the cathodic dip coating, wherein the cathodic dip to be applied preferably additionally blocked and / or unblocked isocyanate group-containing organic compounds as a curing agent and particularly preferred additionally also comprises at least one water-soluble compound of the element bismuth and / or of the element yttrium, which in each case is able to exert a positive influence on the crosslinking of the paint coagulum in the baking step.
  • compounds of these elements are "water-soluble" if their solubility in deionized water having a conductivity of not more than 1 pScnr 1 at a temperature of 20 ° C. is at least 1 g / kg.
  • aqueous cleaning / degreasing cleaning solution is preferably alkaline and more preferably has a pH above 8, more preferably has a pH above 10.
  • the cleaning / degreasing on the basis of the aqueous cleaning solution follows the pre-cleaning, preferably without intermediate rinsing step and without drying step, immediately after.
  • Immediately in this context means without one or more intervening wet-chemical treatment steps that do not represent flushing steps.
  • the aqueous agent in the prepurification prepurification to have a total acid content of at least 3 points.
  • a higher acidity is preferred for providing prepurification agents having better cleaning performance for cathodic dipping resist residues, so that the total acid content of the acidic aqueous prepurification agent is preferably at least 5 points, more preferably at least 10 points and most preferably at least 20 points.
  • a pH of the aqueous agent in the pre-purification of less than 5.5 is preferred, more preferably a pH of less than 5.0, and particularly preferably a pH of less than 4.5.
  • the pH of the aqueous agent in the pre-cleaning is not less than 2.0, more preferably not less than 2.5. Should a pH of the aqueous agent of less than 2.5 be required for the effective removal of dross paint residues on the conveyor racks, it is therefore advantageous if the
  • Suitable representatives of such acids are phosphoric acid, which is obligatory anyway, but in addition also phosphoric acid esters, organic diphosphonic acids, ⁇ -hydroxycarboxylic acids and mono- and dicarboxylic acids, such as, for example, gluconic acid, acetic acid, citric acid or tartaric acid.
  • Suitable acids whose pKa value is not above 2.5 and which can be used to adjust the total acidity of the aqueous prepurification agent are nitric acid, sulfuric acid, ethylenediaminetetraacetic acid, etidronic acid and amidosulfonic acid.
  • a cleaning / degreasing containing phosphates as builders is the provision of the total acid according to the invention in the aqueous means of pre-cleaning based on the invention already contained phosphoric acid always advantageous, so that in a preferred embodiment, the proportion of phosphoric acid in the acidic aqueous medium of the pre-cleaning is at least 60%, more preferably at least 80%, based on the total acid in points.
  • pre-purification in the process according to the invention based on an acidic aqueous agent containing phosphoric acid is generally preferred and for setting an optimal total acid content, if the total phosphate content of at least 3 g / kg, more preferably at least 5 g / kg, particularly preferably at least 10 g / kg, very particularly preferably at least 20 g / kg, but preferably less than 50 g / kg calculated in each case as PO4 and based on the acidic aqueous agent of the prepurification.
  • Additiveing of the surface-active compound aqueous prepurifying agent may aid in the removal of electrocoat residues and is optional in the present invention.
  • Preferred surface-active substances are organic surfactants, particularly preferably nonionic organic surfactants.
  • suitable representatives of non-ionic organic tenis with high compatibility with a pre-cleaning subsequent alkaline degreasing / cleaning are ethoxylated and / or propoxylated C8-C12, preferably C8-C10, fatty alcohols having a degree of ethoxylation of 5-1 1 and a Propoyxl istsgrad of 1 7, which may each be at least partially end-capped with C1-C4 monoalcohols.
  • the aqueous agent in the prepurification therefore contains a total of less than 10 g / kg, more preferably less than 1 g / kg of organic compounds and further preferably less than 0.1 g / kg, more preferably less than 0.01 g / kg of dispersed phosphates calculated as PO4.
  • the aqueous agent in the pre-cleaning contains both a total of less than 0.1 g / kg, preferably less than 0.01 g / kg, of dispersed phosphates and also less than 10 g / kg, preferably less than 1 g / kg, of other dissolved compounds which, in the case of pre-purification in the process according to the invention, are not acids having a pKa value above 2.5 and below 5.5.
  • the pre-cleaning at least of the part of each conveyor frame which has been brought into contact with the cathodic electrodeposition coating, and preferably also of the anti-corrosion coated component to be coated by the conveyor frame preferably takes place by means of immersion, humidification and / or spraying, the latter preferably with a spray pressure of at least 2 bar.
  • the temperature of the acidic aqueous agent during the application in the pre-cleaning is preferably in the range of 40 to 60 ° C.
  • the contact time varies depending on the application and the system, but is preferably between 5 and 60 seconds, more preferably between 10 and 30 seconds.
  • aqueous wetting agent containing at least one water-soluble alcohol, preferably selected from 1, 2 Propanediol, ethylene glycol, glycerol, 1, 4-butanediol and / or at least one water-soluble glycol ether, preferably a mono-alkyl ether having not more than 4 carbon atoms of di- or tripropylene (ethylene) glycol, wherein at least the part of the conveyor frame, the in the pre-cleaning is brought into contact with the acidic aqueous agent, after the electrodeposition coating, but before the pre-cleaning, preferably before the conveyor frame receives the component to be coated anti-corrosive, is brought into contact with the aqueous wetting agent.
  • water-soluble alcohol preferably selected from 1, 2 Propanediol, ethylene glycol, glycerol, 1, 4-butanediol and / or at least one water-soluble glycol ether, preferably a mono-alkyl ether having not more than 4 carbon atoms
  • An alcohol or glycol ether in this context is water-soluble in the context of the present invention, if in one kilogram of deionized water having a conductivity of not more than 1 pScnr 1 at a temperature of 20 ° C at least 10 g of the alcohol or glycol ether in the homogeneous phase be solved.
  • the bringing into contact with the aqueous wetting agent is preferably carried out for at least 5 seconds, more preferably for at least 10 seconds, but preferably not longer than 60 seconds.
  • a passivation in the context of the present invention characterizes at least one wet-chemical treatment stage, in the course of which a substantially inorganic coating is produced on at least one surface of a metallic material of the component to be coated with anti-corrosive coating in a layer of at least 10 mg / m 2 .
  • a passivation is then essentially inorganic, if the area-related ratio of TOC content to coating layer in milligrams per square meter is less than 0.2, the TOC content is determined by differential gravimetry after pyrolysis of a dried passivation in nitrogen atmosphere at a peak metal temperature of 600 ° C.
  • the passivation is based on acidic aqueous treatment solutions containing dissolved phosphates and / or water-soluble compounds of the elements Zr, Ti and / or Si, most preferably on a phosphating, in particular a zinc phosphating, usually by means of acidic aqueous solutions containing 0 , 3-3 g / kg of zinc ions and 5-50 g / kg of phosphate ions is applied and preferably provides layer weights in the range of 0.5-4 g / m 2 calculated as P0 4 .
  • a zinc phosphating conventionally comprises several wet-chemical treatment stages, since conversion of the metal surfaces prior to the actual zinc phosphating, ie conversion layer formation, which is preferably carried out with alkaline adjusted and phosphate particle-containing dispersions, is regularly required. Especially for passivations based on dissolved phosphates is ensured in the process according to the invention that an additional transfer of phosphate ions from the passivation is prevented in the electrocoating on Lackanhaftept on the conveyor racks, so that a destabilization of the dip coating by increased phosphate entry in the inventive method not is to be feared.
  • the inventive method therefore relates to the anti-corrosive coating of metallic components in series comprising at least one degreasing / cleaning, a zinc phosphating and a cathodic electrodeposition respectively as a wet chemical treatment stages, the treatment stage of the degreasing / cleaning always that of zinc phosphating in the Process sequence precedes the anti-corrosive coating and is based on an aqueous cleaning solution whose pH is above 6, and wherein the treatment step of the cathodic electrodeposition coating always follows that of zinc phosphating in the process sequence to the anti-corrosive coating in which each pretreated component of the series of a Received conveyor frame, then the transport pair consisting of component and conveyor frame guided by the wet chemical treatment stages according to the process sequence and the pair of transport separated from each other after the last treatment stage and a corrosion-protected coated component is discharged, and then the thus released conveyor frame receives a next component of the series to the process sequence for the purpose of anti-corrosive coating thereof to go through again
  • the respective subsequent treatment stage of the pre-cleaning and the passivation this immediately, i. with or without intermediate rinsing step, but without drying step follows.
  • Immediately in this context means without one or more intervening wet-chemical treatment steps that do not represent flushing steps. If reference is made in the context of the present invention to the performance of a "rinsing step”, this always refers to a process which alone is intended to remove a wet film adhering to the component from an immediately preceding wet chemical treatment step from the surface of the component and in this way to prevent the transfer of components from wet-chemical treatment steps to subsequent ones.
  • a "drying step” in the sense of the present invention refers to a process in which the surfaces of the metallic component having a wet film are to be dried with the aid of technical measures, for example supplying thermal energy or passing an air stream.
  • the process sequence for the corrosion-protective pretreatment of components in series is followed by the stoving of the electrodeposition paint to form a cured coating, wherein preferably again conveyor frames, but these are not such conveyor racks, which belong to the process sequence of corrosion-protective pretreatment, pick up the pre-treated components and transferred to the baking stage and possibly subsequent stages for further coating.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Electrochemistry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

La présente invention concerne un procédé de revêtement anticorrosion de composants métalliques en série. Le procédé comprend une pluralité d'étapes de traitement chimique par voie humide incluant une peinture électrophorétique par immersion cathodique qui termine le processus de revêtement, dans lequel chaque composant est reçu par un châssis de convoyeur et la paire de transport formé d'un composant et d'un châssis de transport est ensuite passée à travers toutes les étapes de traitement avant que le composant revêtu fini ne soit séparé du châssis de transport et qu'un composant non revêtu ne soit reçu par le même châssis de transport en vue du revêtement. Dans le procédé, l'accumulation de dépôts de peinture massifs sur les châssis de transport est supprimée par intégration d'une étape de traitement supplémentaire avant le dégraissage/nettoyage et la passivation et la peinture électrophorétique par immersion subséquentes. De cette manière, dans le procédé de l'invention, le processus de revêtement peut être mis en œuvre de manière économique du prétraitement à la peinture électrophorétique par immersion dans un système unique (appelé « single loop »), car l'évacuation d'éléments de transport individuels permet d'éliminer les dépôts de peinture après intégration du pré-nettoyage. Dans le contexte de la présente invention, une élimination efficace des constituants de peinture provenant de la peinture électrophorétique par immersion cathodique est obtenue par simple mise en contact des châssis de transport, et donc également des composants à revêtir reçu par le châssis de transport, avec un agent aqueux d'acidité appropriée contenant de l'acide phosphorique avant d'effectuer les étapes de traitement chimique par voie humide pour le dégraissage/nettoyage, la passivation et la peinture électrophorétique par immersion cathodique.
EP19720648.5A 2018-05-16 2019-05-02 Nettoyage des râteliers dans un procédé de dépôt électrophoréctique Active EP3794167B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP18172576.3A EP3569743A1 (fr) 2018-05-16 2018-05-16 Nettoyage de charriot dans un cycle d'opération de laquage par électro-immersion
PCT/EP2019/061235 WO2019219395A1 (fr) 2018-05-16 2019-05-02 Nettoyage de châssis de transport dans une succession de processus de peinture électrophorétique par immersion

Publications (2)

Publication Number Publication Date
EP3794167A1 true EP3794167A1 (fr) 2021-03-24
EP3794167B1 EP3794167B1 (fr) 2022-11-02

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EP18172576.3A Withdrawn EP3569743A1 (fr) 2018-05-16 2018-05-16 Nettoyage de charriot dans un cycle d'opération de laquage par électro-immersion
EP19720648.5A Active EP3794167B1 (fr) 2018-05-16 2019-05-02 Nettoyage des râteliers dans un procédé de dépôt électrophoréctique

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US (1) US20210062356A1 (fr)
EP (2) EP3569743A1 (fr)
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US5084263A (en) * 1989-07-24 1992-01-28 Mccoy/Defalco Electrochemics, Inc. Method of preparing inorganic polymeric water complexes and products so produced
US8877029B2 (en) * 2007-08-15 2014-11-04 Ppg Industries Ohio, Inc. Electrodeposition coatings including a lanthanide series element for use over aluminum substrates
DE102007057185A1 (de) 2007-11-26 2009-05-28 Henkel Ag & Co. Kgaa Zirconiumphosphatierung von metallischen Bauteilen, insbesondere Eisen
PL2503025T3 (pl) 2011-03-22 2013-12-31 Henkel Ag & Co Kgaa Chroniąca przed korozją, wielostopniowa obróbka metalowych elementów konstrukcyjnych o powierzchniach cynkowych
DE102011051879B4 (de) * 2011-07-15 2023-11-09 Dürr Systems Ag Anlage und Verfahren zur Oberflächenbehandlung von Werkstücken sowie Verwendung einer solchen Anlage zum Lackieren von Werkstücken
DE102014225237B3 (de) * 2014-12-09 2016-04-28 Henkel Ag & Co. Kgaa Verfahren zur nasschemischen Vorbehandlung einer Vielzahl von Eisen- und Aluminiumbauteilen in Serie
US20160258079A1 (en) * 2015-03-04 2016-09-08 TKS Industrial Company Method and apparatus for removing residue from electrocoated articles
DE102015209909A1 (de) * 2015-05-29 2016-12-01 Henkel Ag & Co. Kgaa Konditionierung vor einer Konversionsbehandlung von Metalloberflächen
DE102016206418A1 (de) * 2016-04-15 2017-10-19 Henkel Ag & Co. Kgaa Unterdrückung anlagenbedingter phosphatüberschleppung in einer prozessfolge zur tauchlackierung
DE102016206417A1 (de) * 2016-04-15 2017-10-19 Henkel Ag & Co. Kgaa Fördergestellbehandlung zur unterdrückung anlagenbedingter phosphatüberschleppung in einer prozessfolge zur tauchlackierung

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WO2019219395A1 (fr) 2019-11-21
CN112119184A (zh) 2020-12-22
EP3569743A1 (fr) 2019-11-20
US20210062356A1 (en) 2021-03-04
EP3794167B1 (fr) 2022-11-02

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