EP3704286B1 - Verfahren und zusammensetzung zur behandlung von metalloberflächen unter verwendung dreiwertiger chromverbindungen - Google Patents

Verfahren und zusammensetzung zur behandlung von metalloberflächen unter verwendung dreiwertiger chromverbindungen Download PDF

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EP3704286B1
EP3704286B1 EP18804756.7A EP18804756A EP3704286B1 EP 3704286 B1 EP3704286 B1 EP 3704286B1 EP 18804756 A EP18804756 A EP 18804756A EP 3704286 B1 EP3704286 B1 EP 3704286B1
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composition
metal surface
panels
pretreatment composition
trivalent chromium
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French (fr)
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EP3704286A1 (de
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Jose B. Rivera
Cody HANNA
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Bulk Chemicals Inc
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Bulk Chemicals Inc
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    • 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
    • C23C22/24—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 hexavalent chromium compounds
    • C23C22/33—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 hexavalent chromium compounds containing also 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
    • 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
    • C23C22/10—Orthophosphates containing oxidants
    • 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
    • C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
    • C23C2222/10—Use of solutions containing trivalent chromium but free of hexavalent chromium

Definitions

  • This invention relates generally to compositions and the use of such compositions for passivating and improving the paint adhesion of metal surfaces.
  • the composition may be used as a pre-paint treatment and is intended to be used to treat a range of metals including copper, brass, magnesium, aluminum, iron, zinc, cadmium, or alloys thereof. More particularly, this invention relates to an aqueous composition, suitable for use as a dried-in-place coating for metal, that comprises trivalent chromium, phosphate, silica, and hydrogen peroxide and methods for using that composition. The process and seal coat have been found to demonstrate good paint adhesion results.
  • Known methods of treating metal surfaces to improve paint adhesion and corrosion resistance of painted metal surfaces include two general classes of chemistries.
  • the first class is based on traditional conversion coating types of chemistries, such as zinc phosphate, iron phosphate, chromium chromate, chromium phosphate, etc.
  • the second class is based on more recent developments in the metal pretreatment industry and is characterized by what is now referred to as "dried-in-place" technology.
  • Traditional conversion coating chemistries require rinsing of the metal substrate to remove applied pretreatment solution. Dried-in-place chemistries allow for the applied solutions to be dried on the metal substrate to which they are applied, without rinsing prior to the application of a paint.
  • chromate conversion coatings aqueous hexavalent chromium solutions which contain chemicals that dissolve the surface of the metal and form insoluble films.
  • chromate conversion coatings which contain hexavalent chromium, are corrosion resistant and protect the metal from various elements which cause corrosion.
  • hexavalent chromate conversion coatings generally have good paint bonding characteristics and, therefore, provide an excellent base for paint or other finishes.
  • Hexavalent chromium shows toxicological effects and has been determined by the Environmental Protection Agency as a risk to the environment and by the Occupational Safety and Health Agency as a health risk. Moreover, chemistries based on hexavalent chromium are classified as carcinogens by these agencies.
  • aqueous compositions for treating metal surfaces comprising silica and Cr(H 2 PO 4 ) 3 are disclosed in GB2201157 A , JP 54935432 A , EP 2060660 A1 , EP 0532779 A1 , JP H01123081 A EP 1484432 A , and EP 1712524 A1 .
  • the present invention relates to a composition for treating a metal surface to improve paint adhesion and corrosion resistance and/or maintain low electrical contact resistance.
  • a composition consisting of water, a trivalent chromium compound with the formula Cr(H x PO 4 ) 3 , where x is 2, a silica compound, and optionally hydrogen peroxide.
  • composition consisting of water, a trivalent chromium compound with the formula Cr(H x PO4) 2 where x is 1.5, a silica compound, and optionally hydrogen peroxide.
  • the trivalent chromium compound is present in an amount of between: about 10% wt. % to about 5% wt. %; about 10% wt. % to about 2.5% wt. %, about 10% wt. % to about 1% wt. %, or about 10% wt. % to about 0.5% wt. %..
  • the silica is present in an amount of less than 2% wt. %; less than 1.75% wt. %; or less than 1.5% wt. %.
  • a process for treating a metal surface includes the step of contacting the metal surface with a composition of claims 1 or 5.
  • the process for treating a metal surface comprises the steps of: (1) cleaning the metal surface to form a cleaned metal surface; (2) rinsing the cleaned metal surface with water to form a rinsed metal surface; and (3) contacting the rinsed metal surface with a composition of claims 1 or 5.
  • the process additionally comprises, after contacting the rinsed metal surface with the composition, again rinsing the metal surface with water and then sealing the metal surface.
  • the processes may additionally comprise, before the first contacting step, the step of cleaning the metal surface with an alkaline cleaner and rinsing.
  • the processes may further comprise, after contacting the metal surface with the pretreatment composition, the steps of rinsing the metal surface with water and then painting the surface of the metal.
  • the pH of the aqueous pretreatment composition is preferably acidic and more preferably has a pH of between about 1 and about 4.
  • compositions according to the present invention consist of water, a trivalent chromium compound with the formula Cr(H x PO 4 ) 3 , where x is 2, or with the formula Cr(H x PO 4 ) 2 , where x is 1.5, a silica compound, and optionally hydrogen peroxide.
  • Processes according to the present invention include contacting a metal surface with the above compositions.
  • compositions of the present invention are applied to a metal surface after cleaning but before some final coat is applied to the metal surface, contributing to at least one of the following: (1) improving the paint adhesion of the metal surface; (2) improving the corrosion resistance of the metal surface; and (3) maintaining or reducing the resistivity of the metal surface.
  • Compositions of the present invention include compositions which significantly improve one or two of these characteristics, even though at least one of the others is worsened to a lesser extent. The improvement could be due to the compositions alone or the compositions in combination other process steps. Such compositions are referred to herein or in the metal treatment industry as pretreatment compositions, conversion coatings, or working compositions. "Resistivity" is defined as resistance per unit surface area.
  • hexavalent chromium compound means compounds, namely salts, of chromium in which the chromium has a valence of plus 6.
  • anions could be used, and more than one hexavalent chromium compound could be used.
  • the hexavalent chromium compound is anhydrous chromic acid (CrO 3 ), chromic acid (H 2 CrO 4 ), or chromium chromate (Cr 5 O 12 ).
  • metal used for example in the phrase “metal surface,” includes copper, brass, magnesium, aluminum, iron, zinc, cadmium, or alloys thereof. Each metal listed includes both the elemental metal and alloys thereof; for example, the term “aluminum” means aluminum and aluminum alloys.
  • alloy is a metal in which the primary element has a higher content than every other element or a content equal to the highest content of every other element (e.g., an aluminum alloy being a metal in which aluminum is present in an amount at least equal to that of any other element).
  • Iron alloys include cold rolled steel, electro-galvanized steel, and hot-dipped galvanized steel.
  • compositions of the present invention are used to treat a range of metals including alloys of copper, brass, magnesium, aluminum, and iron.
  • pretreatment composition means any composition which improves the paint adhesion and corrosion resistance of a metal surface.
  • Aqueous pretreatment compositions are used as a pretreatment before painting and may be used as a passivation treatment to reduce the formation of corrosion in the uncoated (unpainted) condition.
  • the composition may be called a pretreatment composition for convenience, it is a composition used for pretreatment (i.e., improving the adhesion of subsequently applied paint) and passivation (i.e., resisting corrosion of the unpainted surface).
  • the term "treating” shall mean applying a treatment or cleaning, rinsing, and applying a pretreatment.
  • the pretreatment also functions as a sealant to seal the metal surface, so the term “treating” shall optionally include the step of sealing the metal surface.
  • “treating” optionally can include process steps up through and including painting.
  • treatment steps may also include a step of applying a decorative coating, such as painting.
  • the pretreatment may be rinsed first or dried-in-place before application of the paint. Each of these steps play a role in a final product's ability to resist corrosion and minimize paint loss.
  • the treatment composition can be used as a pre-paint treatment.
  • trivalent chromium compound means compounds, namely salts, of chromium in which the chromium has a valence of plus 3. No hexavalent chromium is present in such compounds.
  • the trivalent chromium compound is a compound with the formula Cr(H x PO 4 ) 3 , where x is 2 or a compound with the formula Cr(H x PO 4)2 , where x is 1.5.
  • the trivalent chromium compound is present in an amount of between: about 10% wt. % to about 5% wt. %; about 10% wt. % to about 2.5% wt. %, about 10% wt. % to about 1% wt. %, or about 10% wt. % to about 0.5% wt. %..
  • the silica is present in an amount of less than 2% wt. %; less than 1.75% wt. %; or less than 1.5% wt. %.
  • the precursor hexavalent chromium compound is anhydrous chromic acid (CrO 3 )
  • the chromic acid is first reduced in the presence of phosphoric acid to create a trivalent chromium compound, chromium dihydrogen phosphate (Cr(H 2 PO 4 ) 3 ). Hydrogen peroxide is the reducing agent. After the chromium is reduced, silica is added.
  • pH range has been found to be preferred given certain other conditions: 1 to 4.
  • compositions given above are of the working bath. It is desirable, of course, to transport the product in the form of a concentrate, namely up to a 10 to 100 fold increase in concentration of the above working bath concentrations.
  • the upper limit of such concentrates is the solubility limit of the first constituent to meet or exceed its solubility limit.
  • the pH of the compositions is preferably, when the composition is used to treat cold rolled steel, between 1 to 4. More preferably, the pH is about 1.75.
  • compositions according to the invention may be made by mixing the ingredients in any of a number of sequences.
  • a hexavalent chromium compound is a precursor material
  • the hexavalent chromium compound is first reduced in the presence of phosphoric acid to create a trivalent chromium compound, chromium dihydrogen phosphate (Cr(H 2 PO 4 ) 3 ). Hydrogen peroxide is the reducing agent. After the chromium is reduced, silica is added.
  • hexavalent chromium compound is a precursor material
  • the hexavalent chromium compound is metered into a solution containing phosphoric acid and hydrogen peroxide until the hexavalent chromium compound is fully reduced. After the chromium is reduced, silica is added.
  • the hydrogen peroxide upon completion of the reaction some residual hydrogen peroxide may remain. Conversely, in another non-limiting embodiment, the hydrogen peroxide is fully utilized. Preferably, upon completion of the reaction the hydrogen peroxide concentration is within the following range: from 0 to about 0.85 grams H 2 O 2 (35%) per gram of Cr(H 2 PO 4 ) 3 .
  • a metal surface is coated with a pretreatment composition of the present invention.
  • the composition may contact the metal surface by any number of techniques known in the art.
  • One such method is immersion coating in which the metal is immersed in the bath of pretreatment.
  • Other techniques known in the art including spraying, roll coating, or reverse roll coating, as well as manual application (e.g., brushing).
  • the coating step is done for a time sufficient to achieve the desired coating weight on the metal surface, which can be determined empirically. This desired coating weight will depend on a number of factors well-known in the art.
  • 1 milligram per square foot is equal to 10.7639 milligrams per square meter.
  • the amount of coating is sufficient to leave from about 0.1 to about 30 milligrams of chromium and phosphate per each square foot of dried metal surface as determined by the weight-strip-weight method. In another embodiment, the amount of coating is sufficient to leave from about 1 to about 10 milligrams of chromium per each square foot of dried metal surface as determined by x-ray fluorescence, and most preferably about 2.5 to about 3.5 milligrams of chromium per each square foot of dried metal surface as determined by x-ray fluorescence.
  • a process for treating a metal surface to improve corrosion resistance, improve paint adhesion, and/or maintain low electrical contact resistance comprises: (1) cleaning the metal surface to form a cleaned metal surface; (2) rinsing the cleaned metal surface with water to form a rinsed metal surface; and (3) contacting the rinsed metal surface with a composition disclosed herein.
  • the cleaning step may be carried out in any manner known in the art.
  • the types of cleaners suitable for use in the present invention will vary with a number of factors, including the metal being treated, the desired application, and the amount and type of impurities and soils on the metal surface. As such, the preferred cleaners can be determined empirically based on these factors.
  • an alkaline cleaner is used.
  • An exemplary alkaline cleaning agent which can be used in connection with the present invention is Bulk Kleen ® 841MC cleaner, an alkaline liquid cleaner sold by Bulk Chemicals, Incorporated of Reading, Pa.
  • a phosphoric acid cleaner is used.
  • the cleaning step may be accomplished by contacting the metal surface with a bath of an alkaline cleaning solution to form a cleaned metal surface.
  • the alkaline cleaning solution may be an aqueous solution of an alkaline cleaning agent.
  • the cleaning bath cleans the metal surface by removing oil and other contaminants from the metal surface.
  • the cleaning bath is effective to remove the loose impurities and surface soils.
  • the cleaning bath removes soils and certain impurities from the surfaces of the metal surface. If the metal surface is heavily soiled, a detergent cleaner additive may be included in the cleaning step.
  • a metal surface which has been contacted by an alkaline cleaning solution is referred to herein as a "cleaned metal surface.” It is cleaned in the sense that it has been exposed to a cleaning bath. It may not be completely cleaned, however, in the sense that substantially all of the impurities have been removed such that it is ready to be exposed to a pretreatment composition. In some cases, it may be adequately cleaned, but in other cases, it should first be rinsed with water before being contacted with a pretreatment composition (i.e., substantially all of the impurities are removed by that point).
  • the rinsing step is well-known in the art, and deionized water is preferably used.
  • deionized water avoids the introduction of any deleterious ions, such as chloride ions, into the system.
  • the rinsing step can be two-fold, with a first rinsing step done using tap water and then rinsing with deionized water.
  • the metal surface may be rinsed with water once again, as is well-known in the art.
  • the rinsed metal surface can then be sealed. Any chemical sealing composition well-known in the industry can be used.
  • an intervening rinsing step is preferably applied.
  • the metal surface may be dried, or rinsed and dried, and then a decorative coating may be applied to it.
  • the metal surface may be painted or lacquered, or first primed and then painted.
  • finishing steps are known in the art as "finishing steps," and any known and suitable finishing steps may be used.
  • Suitable paints include acrylic paints and fluorocarbon paints, among others.
  • the metal surface can be dried and then a decorative coating (a paint layer) is applied, without an intervening rinsing step between these steps.
  • a decorative coating a paint layer
  • This alternative process is known as a "dried-in-place" pretreatment. Regardless of whether the pretreatment is “dried-in-place" or there is an intermediate rinsing step, any known method of drying may be employed.
  • the coating may be dried by, for example, using an oven, forced air, etc.
  • Determining the times of treatments of the metal surfaces with the baths of the various steps is well-known in the art. They need only be long enough to permit a sufficient time for cleaning (in the case of the cleaning step) or reaction (in the case of the pretreatment or sealing steps). They can be very short or as long as thirty minutes and depend on the stage of treatment, the type of application (e.g., immersion, spray), the type of metal surface, and the desired coating weight, among other factors.
  • the immersion time of a substrate into the composition solution will vary with the stage, and generally varies between approximately 1 minute up to about 10 minutes. The times for immersion are typically longer than when spray is used as the method of contact. Rinse times in general can be fairly short, e.g., 30 seconds to one minute.
  • the specific times of treatment may vary over wide ranges and can be readily determined by one of ordinary skill in the art.
  • the desirable performance characteristics of the present invention can be achieved by the processing steps described above to produce a pretreated metal surface with good paint adhesion and corrosion resistance. These characteristics are obtained on the metal surface without a decorative coating. Accordingly, the treated metal surface can be used as unpainted products and will exhibit corrosion resistance even if there is a delay between the treatment steps and any subsequent painting.
  • compositions and processes of the present invention provide the stated benefits without the use of additional components which affect the basic and novel characteristics of the invention.
  • other components may affect the novel characteristics.
  • certain components may make the compositions unstable. Such components may affect the shelf-life of the treatment.
  • Other components may degrade the performance of the compositions and processes of the present invention.
  • the present invention provides environmentally friendly compositions and processes for treating metal, while still maintaining excellent paint adhesion and corrosion resistance. More particularly, the present invention avoids the use of hexavalent chromium, and its associated health hazards and disposal problems.
  • Figs. 1-4 illustrate the improved results obtained by employing aqueous compositions of this invention. These examples are exemplary, not restrictive, of the invention.
  • Cold rolled steel panels were treated via the following spray process.
  • Bulk Kleen ® 841MC is an alkaline cleaner designed to clean steel, zinc, and aluminum parts.
  • the panels were rinsed with deionized water at ambient temperature for 30 seconds.
  • Fifth, Composition 1 was applied to the panels using a roll coater.
  • Seventh, all panels were painted using a high reflectance white, single coat polyester at a dry film thickness of 0.018-0.02 mm.
  • Cold rolled steel panels were treated via the following spray process.
  • Composition 2 was applied to the panels using a roll coater.
  • the panels were rinsed with deionized water. Sixth, the panels were dried using hot air. Seventh, the control panels were then sealed with Bulk Bond ® NP250 35% v/v using a roll coater. Bulk Bond ® NP250 is a liquid chrome/silica product designed to be mill applied as a passivation/pretreatment for multi-metal surfaces. Eighth, all panels were dried and painted using a high reflectance white, single coat polyester at a dry film thickness of 0.018-0.02 mm.
  • Cold rolled steel panels were treated via the following spray process.
  • Fifth, the composition outlined in Example 1 of the Rausch et al. patent was applied to the panels using a roll coater.
  • composition 1 and Composition 2 provided comparable protection to the control formula (i.e., Bulk Bond ® 780) and outperformed the Rausch et al. formula. Specifically, Composition 1 and Composition 2 exhibited similar corrosion and pitting as the control formula, whereas the Rausch et al. formula exhibited increased corrosion and pitting.
  • Composition 1 and Composition 2 outperformed the Rausch et al. formula because of the additional ions other than chromium, phosphate, and silica present in the Rausch et al. formula.

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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)
  • Manufacture And Refinement Of Metals (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Paints Or Removers (AREA)

Claims (10)

  1. Wässrige Vorbehandlungszusammensetzung zur Behandlung einer Metalloberfläche, wobei die Zusammensetzung besteht aus:
    Wasser;
    Kieselsäure;
    eine dreiwertige Chromverbindung mit der Formel Cr(H2PO4)3, und
    optional Wasserstoffperoxid.
  2. Wässrige Vorbehandlungszusammensetzung nach Anspruch 1, wobei die Vorbehandlungszusammensetzung sauer ist.
  3. Wässrige Vorbehandlungszusammensetzung nach Anspruch 1 oder 2, wobei die Vorbehandlungszusammensetzung einen pH-Wert von 1 bis 4 aufweist.
  4. Wässrige Vorbehandlungszusammensetzung nach einem der Ansprüche 1 bis 3, wobei die wässrige Vorbehandlungszusammensetzung weniger als 1,75 Gew.-% Kieselsäure und 2,5 Gew.-% bis 10 Gew.-% der dreiwertigen Chromverbindung enthält.
  5. Wässrige Vorbehandlungszusammensetzung zur Behandlung einer Metalloberfläche, wobei die Zusammensetzung besteht aus:
    Wasser;
    Kieselsäure;
    einer dreiwertigen Chromverbindung mit der Formel Cr(H1,5PO4)2,
    und optional Wasserstoffperoxid.
  6. Wässrige Vorbehandlungszusammensetzung nach Anspruch 5, wobei die Vorbehandlungszusammensetzung sauer ist.
  7. Wässrige Vorbehandlungszusammensetzung nach Anspruch 5 oder 6, wobei die Vorbehandlungszusammensetzung einen pH-Wert von 1 bis 4 aufweist.
  8. Wässrige Vorbehandlungszusammensetzung nach einem der Ansprüche 5 bis 7, wobei die wässrige Vorbehandlungszusammensetzung weniger als 1,75 Gew.-% Kieselsäure und 2,5 Gew.-% bis 10 Gew.-% der dreiwertigen Chromverbindung enthält.
  9. Verfahren zum Beschichten einer Metalloberfläche, das folgende Schritte umfasst:
    Walzbeschichten der Metalloberfläche mit der Zusammensetzung nach Anspruch 1 oder 5;
    Besprühen der Metalloberfläche für eine Dauer von bis zu 300 Sekunden in die Zusammensetzung nach Anspruch 1 oder 5; oder
    Eintauchen der Metalloberfläche für eine Dauer von bis zu 300 Sekunden mit der Zusammensetzung nach Anspruch 1 oder 5.
  10. Verfahren nach Anspruch 9, wobei die Metalloberfläche aus der Gruppe, bestehend aus Zink, Zinklegierungen, Aluminium, Aluminiumlegierungen, Stahl, verzinktem Stahl und Zink mit Aluminiumlegierung ausgewählt ist.
EP18804756.7A 2017-10-30 2018-10-25 Verfahren und zusammensetzung zur behandlung von metalloberflächen unter verwendung dreiwertiger chromverbindungen Active EP3704286B1 (de)

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US201762578787P 2017-10-30 2017-10-30
PCT/US2018/057533 WO2019089347A1 (en) 2017-10-30 2018-10-25 Process and composition for treating metal surfaces using trivalent chromium compounds

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EP3704286A1 EP3704286A1 (de) 2020-09-09
EP3704286B1 true EP3704286B1 (de) 2023-12-06

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US (1) US20200325582A1 (de)
EP (1) EP3704286B1 (de)
JP (1) JP2021501263A (de)
KR (1) KR20200081415A (de)
CN (1) CN111356786A (de)
BR (1) BR112020008635A2 (de)
CA (1) CA3079516A1 (de)
MX (1) MX2020004244A (de)
WO (1) WO2019089347A1 (de)

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KR20200081415A (ko) 2020-07-07
BR112020008635A2 (pt) 2020-10-06
CN111356786A (zh) 2020-06-30
MX2020004244A (es) 2020-07-29
WO2019089347A1 (en) 2019-05-09
EP3704286A1 (de) 2020-09-09
JP2021501263A (ja) 2021-01-14
CA3079516A1 (en) 2019-05-09
US20200325582A1 (en) 2020-10-15

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