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 an electrocoating, which completes the coating process, in which each component is received by a conveyor frame and the transport pair consisting of component and conveyor frame is then passed through all treatment stages, before the finished coated component is separated from the conveyor frame and an uncoated component is received by the same conveyor frame for coating, wherein in the process by incorporating an additional treatment stage prior to passivation and subsequent electrocoating the construction of massive paint deposits is prevented on the conveyor racks.
• 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.
• an effective removal of the coating constituents received from the electrodeposition coating takes place by merely bringing the conveyor frames and thus also the components to be coated from the conveyor frame into contact with an aqueous agent of suitable acidity or alkalinity before the wet-chemical treatment stages Passivation and electrocoating.
• 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 be the formation of a crystalline conversion layer, for example.
• the thus passivated metallic components are usually immediately after a sink in the treatment stage of Electrocoating transferred.
• 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 latter is the case in particular in the case of alkaline cleaning and degreasing, when a cathodic electrodeposition coating is also provided for the coating.
• the economy of a single-loop system is therefore despite their basically efficient driving due to the required regular maintenance of the conveyor racks and the associated plant downtime compared to those production lines in which the body after passivation and before the electrocoating separated from its conveyor frame and for further coating of a second conveyor frame system is added, often not given.
• the task of the present The invention is therefore to improve the efficiency of a single-loop system in the anti-corrosive coating of metallic components in series including their passivation and electrodeposition by ensuring continuous operation of the coating system during series production.
• a metallic component according to the present invention is when the component is at least partially composed of at least one metallic material, preferably of zinc, iron, aluminum and of the respective alloys, inasmuch as the aforementioned elements in each case the main alloy component with more than 50 at. -% form, as well as 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. It is usually preferred for reasons of process economics if a multiplicity of conveyor racks are also used, preferably for the quasi-continuous treatment of a large number of components in series the number of conveyor racks corresponds at least 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 total alkalinity is determined according to the invention by diluting 10 ml of the aqueous prepurification agent to 50 ml and titrating with 0.1 N hydrochloric acid to a pOH value of 8.5.
• the consumption of milliliters of hydrochloric acid indicates the total alkalinity score.
• the pH value or pOH value corresponds to the negative decadic logarithm of the activity of the hydronium or hydroxide ions measured by means of pH-sensitive glass electrodes at 20 ° C. after their calibration with the pH suitable for the pH or pOH range in question -Pufferitesen.
• 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 set in the process according to the invention on the type of electrocoating. For example, the removal of cathodic dip paint residues from the conveyor racks requires acidic aqueous agents in the pre-cleaning, whereas anodic dipping lacquer residues can be cleaned in alkaline aqueous agents.
• An electrodeposition coating in the context of the present invention characterizes a wet-chemical treatment stage, in the course of which a curable coating coagulate is deposited on the metallic component by application of an electrical voltage, which in a following Treatment stage is filmed by firing and cured.
• the electrodeposition coating is preferably based on an aqueous agent containing at least one dispersed organic resin in an amount of at least 1% by weight based on the aqueous agent.
• the electrodeposition paint is cathodically depositable, ie by applying an electrical voltage, in which the metallic component to be coated to be coated 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 binder which in turn is preferably selected from amine-modified polyepoxides, used for 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 ⁇ Scm -1 at a temperature of 20 ° C. is at least 1 g / kg.
• the economic yield in such processes according to the invention is the maximum and the basis for the establishment of a pre-purification in one conventional process sequence consisting of passivation and cathodic electrodeposition coating, in which the treatment stage of the passivation precedes a cleaning / degreasing as a wet chemical treatment stage within the process sequence for corrosion-protective coating of components in series, but which follows the treatment stage of the pre-cleaning, the cleaning / degreasing based on a aqueous cleaning solution whose pH is above 6, preferably above 8, more preferably above 10.
• the cleaning / degreasing based on the aqueous cleaning solution follows the pre-cleaning preferably without intervening rinsing step and without drying step immediately after.
• 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 dip paint residues on the conveyor racks, it is therefore advantageous if additivation of corrosion inhibitors known to the person skilled in the art.
• the pKs value is above 2.5, but below 5.5.
• the proportion of acids having a pKa in the preferred range of 2.5-5.5 accounts for at least 80% of the total acid content.
• Preferred representatives of such acids are phosphoric acid, phosphoric acid esters, organic diphosphonic acids, ⁇ -hydroxycarboxylic acids and mono- and dicarboxylic acids, more preferably phosphoric acid, gluconic acid, acetic acid, citric acid and tartaric acid, particularly preferably phosphoric 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.
• the pOH value of the aqueous agent in the pre-cleaning is less than 5.5, more preferably less than 5.0, particularly preferably less than 4, 5, but preferably not less than 2.5, and recourse is had to the use of bases having a corresponding pK B value above 2.5 but below 5.5 in the correspondingly preferred minimum amount of 80% relative to the total alkalinity ,
• a pre-cleaning based on an acidic aqueous agent containing phosphoric acid in processes with cathodic electrocoating is generally and for setting an optimal total acid content is preferred 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 PO 4 and based on the 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 surfactants 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 5-11 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 PO 4 .
• the aqueous agent in the pre-cleaning contains both overall 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-cleaning in processes with cathodic electrocoating no acid with pKs above 2.5 and below 5.5, and in the case of prepurification in anodic electrodeposition processes, does not represent a base having a pK B above 2.5 and below 5.5.
• the pre-cleaning with the aqueous agent of at least the part of each conveyor frame which has been brought into contact with the electrocoating, 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 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 Propandiol, 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, in the Pre-cleaning is brought into contact with the aqueous agent, after the electrocoating, but before the pre-cleaning, preferably before the conveyor frame receives the anti-corrosive component to be coated, is brought into contact with the aqueous wetting agent.
• water-soluble alcohol preferably selected from Propandiol, 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 (
• 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 ⁇ Scm -1 at a temperature of 20 ° C at least 10 g of the alcohol or the glycol ether in homogeneous Phase to 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 essentially inorganic if the area-related ratio of TOC content to layer coverage in milligrams per square meter is less than 0.2, wherein the TOC content Differenzgravimetrisch after pyrolysis of a dried passivation in a nitrogen atmosphere at a peak metal temperature of 600 ° C is determined.
• 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 PO 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 method according to the invention therefore relates to the corrosion-protective coating of metallic components in series comprising at least one zinc phosphating and cathodic electrodeposition coating as wet-chemical treatment stages, wherein the cathodic electrodeposition coating treatment stage always follows that of zinc phosphating in the process sequence to the corrosion-protective coating each pre-treated component of the series of taken a 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 only after the last treatment stage and a corrosion protective coated component is discharged, and then released in this way conveyor frame a next component of Series re-run to re-run the process sequence for the purpose of anti-corrosive coating, wherein the conveyor frame as often passes through the process sequence as it is necessary to coat the series of components corrosion protection, at least the part of each conveyor frame, which in the cathodic Electrodeposition is brought into contact with the dip paint, after the last treatment step and after receiving a next component to be pretreated, but before
• 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)
• Chemical Kinetics & Catalysis (AREA)
• Engineering & Computer Science (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)

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• 2018
  • 2018-05-16 EP EP18172576.3A patent/EP3569743A1/fr not_active Withdrawn
• 2019
  • 2019-05-02 WO PCT/EP2019/061235 patent/WO2019219395A1/fr unknown
  • 2019-05-02 CN CN201980032232.6A patent/CN112119184A/zh active Pending
  • 2019-05-02 EP EP19720648.5A patent/EP3794167B1/fr active Active
• 2020
  • 2020-11-12 US US17/095,816 patent/US20210062356A1/en not_active Abandoned

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