EP1361297B1 - Method for cleaning and passivation of the surfaces of zinc or zincalloys - Google Patents

Method for cleaning and passivation of the surfaces of zinc or zincalloys Download PDF

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Publication number
EP1361297B1
EP1361297B1 EP02008422A EP02008422A EP1361297B1 EP 1361297 B1 EP1361297 B1 EP 1361297B1 EP 02008422 A EP02008422 A EP 02008422A EP 02008422 A EP02008422 A EP 02008422A EP 1361297 B1 EP1361297 B1 EP 1361297B1
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EP
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Prior art keywords
phosphoric acid
solution
zinc
cleaning
treatment step
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EP02008422A
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German (de)
French (fr)
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EP1361297A1 (en
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Wolf-Dieter Franz
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Priority to AT02008422T priority Critical patent/ATE272133T1/en
Priority to DE50200704T priority patent/DE50200704D1/en
Priority to EP02008422A priority patent/EP1361297B1/en
Priority to PCT/EP2002/010195 priority patent/WO2003087438A1/en
Priority to AU2002329277A priority patent/AU2002329277A1/en
Publication of EP1361297A1 publication Critical patent/EP1361297A1/en
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/34—Anodisation of metals or alloys not provided for in groups C25D11/04 - C25D11/32
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/36—Phosphatising
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/34—Pretreatment of metallic surfaces to be electroplated

Definitions

  • This invention relates to a new method for treating surfaces of die cast parts made of zinc and zinc alloys.
  • the aim of the treatment is one Cleaning and some preservation of the cleaned surface.
  • the zinc alloys to which this invention aims contain a substantial proportion of Zn, in particular at least 90% by weight Zn.
  • this invention is based on the technical problem, both in terms of its cleaning properties as well as its insensitivity against the alloy composition as well as economically efficient Process for cleaning and passivating zinc and zinc alloy surfaces of die-cast parts.
  • US 4133724 discloses a method for anodizing metal layers Compound semiconductor surfaces with a mixture of an acid and a Means for preventing the dissolution of the metal.
  • metal et al Called zinc In addition to aluminum is used as metal et al Called zinc.
  • the metal layers become complete anodized.
  • the invention is directed to a method in which the surface is passivated, characterized by a treatment step in a solution, the phosphoric acid and contains an alcohol in which the surface is connected anodically.
  • the anodic cleaning step in the solution with phosphoric acid and the alcohol has both degreasing and surface etching good efficiency and is also able to remove problematic residues such as removing polysilane release agents.
  • the cleaning method according to the invention especially with a low water content of the solution (electrolyte) a certain inhibitory Effect inherent, so that excessive material removal is prevented.
  • the water content is preferably at most 5 vol%.
  • a thin zinc phosphate layer After the treatment step according to the invention with the phosphoric acid and alcohol containing solution arises from phosphoric acid residues on the treated Surface in a subsequent dilution, for example in a rinsing step, a thin zinc phosphate layer.
  • This zinc phosphate layer forms an effective passivation the surface. It can be used in subsequent steps, such as galvanic Copper coating, can be removed again.
  • the cleaning and passivation method according to the invention can advantageously with a neutral rinsing step, for example in water, with a pH of about 7 to be completed.
  • a neutral rinsing step for example in water
  • a pH of about 7 to be completed can be completed.
  • other steps are also conceivable in which a zinc phosphate passivation layer is formed, in particular aqueous rinse and Treatment steps with deviating pH values, as long as these with the zinc phosphate layer are tolerated.
  • the cleaning effect and in particular the etching effect can be carried out in detail set the choice of the electrical parameters of the anodic cleaning operation and thus optimize it depending on the alloy in question. For example, a certain anodic current density can be used become. This means that you have an optimization parameter in hand that determines the composition of the solution not changed. It can also be used for one and the same Solution with different alloys can be worked optimally. Of course leaves the solution composition can also be optimized depending on the alloy, albeit the inventors could not find any critical dependencies here.
  • alcohols such as methanol, ethanol, propanol and butanol come as alcohol and higher alcohols and their derivatives such as isopropanol. But also diols, polyethers and other alcohols. Are a cheap choice Butanol and isopropanol. Of course, two or more alcohols can be mixed occur.
  • the anodic current density on the anodically polarized surface can advantageously be between 10, 30 or 50 A / m 2 as the lower limit and 500 A / m 2 as the upper limit and, as already explained above, is an optimization parameter depending on the alloy composition, the justifiable material removal and the required cleaning effect.
  • the total treatment time of the anodic cleaning steps can be, for example, between 10 seconds and 5 minutes and depends heavily on the set current density, the justifiable material removal and the degree of pollution.
  • the proportion of phosphoric acid in the solutions for the anodic cleaning steps is 30-90 vol.%, with the phosphoric acid within this volume fraction Can be 50-95 percent by weight.
  • the solutions advantageously consist of the stated volume fraction of phosphoric acid of 30-90 vol.% in the rest essentially from the alcohol (mixture).
  • the cleaning effect of the method according to the invention is so thorough and broad scattered that chemical pretreatment steps before incorporation into the phosphoric acid and the alcohol-containing solution can be dispensed with and for reasons of economy should also advantageously be eliminated.
  • the surfaces to be treated can therefore be applied directly and dry.
  • a particular advantage of the invention lies in the fact that it can also regenerate Alloys give good results, especially no sludge arises.
  • the metallic contaminants from regenerated material have with conventional Procedures led to significant problems in cleaning and often cleaning and subsequent good coating completely prevented.
  • a preferred application of the invention is in the preparation of zinc alloy surfaces for a subsequent coating of any kind.
  • the coating depends on the cleanliness of the surface, and both in terms of the optical properties and the resilience the coating.
  • the invention relates to a subsequent one Metallization that can be done galvanically or without external current. in this respect The invention is also directed to the overall process from that described Cleaning and passivation and the subsequent coating, in particular Metallization.
  • a part made of a standard zinc die-cast alloy (for example, the alloys Z400 to Z430) is put into a bath made of 60 percent phosphoric acid (H 3 PO 4 ) with 40 vol poled anodically.
  • the current density is, for example, 20 A / m 2 at a temperature of 25 ° C. and a treatment time that can be approximately 30 s.
  • the parts are then rinsed in neutral water (pH approx. 7).
  • neutral water pH approx. 7
  • the surface is now passivated and can be metallized in a conventional manner.
  • an electrolytic coating with Ni or Cu or an alloy selected from it.
  • the zinc alloys come from a die casting process, they are usually contaminated with mold release agents. These are also used in the cleaning processes shown removed reliably and completely.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrolytic Production Of Metals (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Electroplating Methods And Accessories (AREA)
  • ing And Chemical Polishing (AREA)

Abstract

Cleaning zinc or zinc alloy surfaces comprises passivating the surface, and treating with a solution containing phosphoric acid and an alcohol when the surface is connected to an anode. An Independent claim is also included for a process for coating a zinc or zinc alloy surface.

Description

Diese Erfindung bezieht sich auf ein neues Verfahren zum Behandeln von Oberflächen von Druckgussteilen aus Zink und Zinklegierungen. Ziel der Behandlung ist eine Reinigung und gewisse Konservierung der gereinigten Oberfläche. Die Zinklegierungen, auf die diese Erfindung abzielt, enthalten einen wesentlichen Anteil Zn, insbesondere mindestens 90 Gew.% Zn.This invention relates to a new method for treating surfaces of die cast parts made of zinc and zinc alloys. The aim of the treatment is one Cleaning and some preservation of the cleaned surface. The zinc alloys to which this invention aims contain a substantial proportion of Zn, in particular at least 90% by weight Zn.

Es sind eine Vielzahl von Verfahren zum Reinigen von Zinklegierungsoberflächen bekannt. Zum Teil leiden diese bekannten Verfahren an dem Nachteil, dass eine größere Zahl aufeinander folgender Behandlungsschritte und damit ein vergleichsweise großer Aufwand nötig sind. Zu einem anderen Teil weisen die bekannten Verfahren ungenügende Reinigungswirkungen bezüglich bestimmter Substanzen auf, beispielsweise werden Trennmittelrückstände, etwa Polysilane, nicht wirklich zuverlässig entfernt.There are a variety of methods for cleaning zinc alloy surfaces known. Some of these known methods suffer from the disadvantage that a larger number of successive treatment steps and thus a comparative one great effort is required. To another part, the known methods insufficient cleaning effects with regard to certain substances, for example, release agent residues, such as polysilanes, are not really reliable away.

Dieser Erfindung liegt insgesamt das technische Problem zugrunde, ein sowohl hinsichtlich seiner Reinigungseigenschaften als auch hinsichtlich seiner Unempfindlichkeit gegen die Legierungszusammensetzung als auch in ökonomischer Hinsicht effizientes Verfahren zum Reinigen und Passivieren von Zink- und Zinklegierungsoberflächen von Druckgussteilen anzugeben. Overall, this invention is based on the technical problem, both in terms of its cleaning properties as well as its insensitivity against the alloy composition as well as economically efficient Process for cleaning and passivating zinc and zinc alloy surfaces of die-cast parts.

Die US 4133724 offenbart ein Verfahren zum Anodisieren von Metallschichten auf Verbindungshalbleiteroberflächen mit einer Mischung aus einer Säure und einem Mittel zur Verhinderung der Auflösung des Metalls. Neben Aluminium wird als Metall u.a. Zink genannt. Als Saure wird u.a. Phosphorsäure genannt und als Mittel zur Verhinderung der Metallauflösung u.a. ein Alkohol. Die Metallschichten werden vollständig anodisiert. US 4133724 discloses a method for anodizing metal layers Compound semiconductor surfaces with a mixture of an acid and a Means for preventing the dissolution of the metal. In addition to aluminum is used as metal et al Called zinc. Among other things, the acid Called phosphoric acid and as a means of Prevention of metal dissolution i.a. an alcohol. The metal layers become complete anodized.

Die Erfindung richtet sich auf ein Verfahren, bei dem die Oberfläche passiviert wird, gekennzeichnet durch einen Behandlungsschritt in einer Lösung, die Phosphorsäure und einen Alkohol enthält, bei dem die Oberfläche anodisch geschaltet ist.The invention is directed to a method in which the surface is passivated, characterized by a treatment step in a solution, the phosphoric acid and contains an alcohol in which the surface is connected anodically.

Vorteilhafte Ausgestaltungen des erfindungsgemäßen Verfahrens sind in den abhängigen Ansprüchen aufgeführt.Advantageous embodiments of the method according to the invention are in the dependent Claims listed.

Es hat sich herausgestellt, dass mit dem erfindungsgemäßen anodischen Reinigungsverfahren eine sehr gründliche und gleichzeitig breite Reinigungswirkung erzielt wird. Der anodische Reinigungsschritt in der Lösung mit Phosphorsäure und dem Alkohol hat sowohl hinsichtlich einer Entfettung als auch Anätzung der Oberfläche eine gute Effizienz und ist außerdem in der Lage, auch problematische Rückstände wie etwa Polysilantrennmittel zu entfernen.It has been found that with the anodic cleaning method according to the invention achieved a very thorough and at the same time broad cleaning effect becomes. The anodic cleaning step in the solution with phosphoric acid and the alcohol has both degreasing and surface etching good efficiency and is also able to remove problematic residues such as removing polysilane release agents.

Infolge des anodischen Betriebs ist dem erfindungsgemäßen Reinigungsverfahren vor allem bei einem geringen Wassergehalt der Lösung (Elektrolyt) eine gewisse inhibierende Wirkung inhärent, so dass ein zu großer Materialabtrag verhindert wird. Der Wassergehalt beträgt vorzugsweise höchstens 5 Vol%.As a result of the anodic operation, the cleaning method according to the invention especially with a low water content of the solution (electrolyte) a certain inhibitory Effect inherent, so that excessive material removal is prevented. The water content is preferably at most 5 vol%.

Nach dem erfindungsgemäßen Behandlungsschritt mit der Phosphorsäure und Alkohol enthaltenden Lösung entsteht durch Phosphorsäurereste auf der behandelten Oberfläche bei einer nachfolgenden Verdünnung, etwa bei einem Spülschritt, eine dünne Zinkphosphatschicht. Diese Zinkphosphatschicht bildet eine effektive Passivierung der Oberfläche. Sie kann bei nachfolgenden Schritten, etwa bei einer galvanischen Kupferbeschichtung, wieder abgelöst werden.After the treatment step according to the invention with the phosphoric acid and alcohol containing solution arises from phosphoric acid residues on the treated Surface in a subsequent dilution, for example in a rinsing step, a thin zinc phosphate layer. This zinc phosphate layer forms an effective passivation the surface. It can be used in subsequent steps, such as galvanic Copper coating, can be removed again.

Das erfindungsgemäße Reinigungs- und Passivierungsverfahren kann vorteilhafterweise mit einem neutralen Spülschritt, etwa in Wasser, mit einem pH-Wert von etwa 7 abgeschlossen werden. Es sind jedoch auch andere Schritte denkbar, bei denen eine Zinkphosphatpassivierungsschicht entsteht, insbesondere wässrige Spül- und Behandlungsschritte bei abweichenden pH-Werten, solange diese mit der Zinkphosphatschicht verträglich sind.The cleaning and passivation method according to the invention can advantageously with a neutral rinsing step, for example in water, with a pH of about 7 to be completed. However, other steps are also conceivable in which a zinc phosphate passivation layer is formed, in particular aqueous rinse and Treatment steps with deviating pH values, as long as these with the zinc phosphate layer are tolerated.

Im Detail lässt sich die Reinigungswirkung und insbesondere die Ätzwirkung durch die Wahl der elektrischen Parameter des anodischen Reinigungsbetriebs einstellen und damit in Abhängigkeit von der speziell in Betracht kommenden Legierung optimieren. Beispielsweise kann mit einer bestimmten anodischen Stromdichte gearbeitet werden. Damit hat man einen Optimierungsparameter in der Hand, der die Lösungszusammensetzung nicht verändert. Es kann damit auch bei ein und derselben Lösung mit verschiedenen Legierungen optimal gearbeitet werden. Natürlich lässt sich auch die Lösungszusammensetzung legierungsabhängig optimieren, wenngleich die Erfinder hier keine kritischen Abhängigkeiten feststellen konnten.The cleaning effect and in particular the etching effect can be carried out in detail set the choice of the electrical parameters of the anodic cleaning operation and thus optimize it depending on the alloy in question. For example, a certain anodic current density can be used become. This means that you have an optimization parameter in hand that determines the composition of the solution not changed. It can also be used for one and the same Solution with different alloys can be worked optimally. Of course leaves the solution composition can also be optimized depending on the alloy, albeit the inventors could not find any critical dependencies here.

Als Alkohol kommen die üblichen Alkohole wie Methanol, Ethanol, Propanol, Butanol und höherwertige Alkohole sowie deren Derivate wie etwa Isopropanol in Betracht. Außerdem aber auch Diole, Polyether und andere Alkohole. Eine günstige Wahl sind Butanol und Isopropanol. Natürlich können auch zwei oder mehrere Alkohole in Mischung auftreten.The usual alcohols such as methanol, ethanol, propanol and butanol come as alcohol and higher alcohols and their derivatives such as isopropanol. But also diols, polyethers and other alcohols. Are a cheap choice Butanol and isopropanol. Of course, two or more alcohols can be mixed occur.

Die anodische Stromdichte auf der anodisch gepolten Oberfläche kann vorteilhafterweise zwischen 10, 30 oder 50 A/m2 als Untergrenze und 500 A/m2 als Obergrenze liegen und wird, wie bereits zuvor ausgeführt, als Optimierungsparameter abhängig von der Legierungszusammensetzung, dem vertretbaren Materialabtrag und der erforderlichen Reinigungswirkung verwendet.The anodic current density on the anodically polarized surface can advantageously be between 10, 30 or 50 A / m 2 as the lower limit and 500 A / m 2 as the upper limit and, as already explained above, is an optimization parameter depending on the alloy composition, the justifiable material removal and the required cleaning effect.

Günstige Temperaturen für die Lösungen der anodischen Reinigungsschritte liegen zwischen 10 und 40° C.Favorable temperatures for the solutions of the anodic cleaning steps lie between 10 and 40 ° C.

Die gesamte Behandlungszeit der anodischen Reinigungsschritte (bei mehreren in der Summe) kann beispielsweise zwischen 10 Sekunden und 5 Minuten liegen und hängt stark von der eingestellten Stromdichte, dem vertretbaren Materialabtrag und dem Verschmutzungsgrad ab.The total treatment time of the anodic cleaning steps (with several in the sum) can be, for example, between 10 seconds and 5 minutes and depends heavily on the set current density, the justifiable material removal and the degree of pollution.

Der Anteil der Phosphorsäure an den Lösungen für die anodischen Reinigungsschritte liegt bei 30-90 Vol.%, wobei die Phosphorsäure innerhalb dieses Volumenanteils 50-95 gewichtsprozentig sein kann. Die Lösungen bestehen vorteilhafterweise außer dem genannten Volumenanteil der Phosphorsäure von 30-90 Vol.% im Rest im wesentlichen aus dem Alkohol(-gemisch). The proportion of phosphoric acid in the solutions for the anodic cleaning steps is 30-90 vol.%, with the phosphoric acid within this volume fraction Can be 50-95 percent by weight. The solutions advantageously consist of the stated volume fraction of phosphoric acid of 30-90 vol.% in the rest essentially from the alcohol (mixture).

Die Reinigungswirkung des erfindungsgemäßen Verfahrens ist so gründlich und breit gestreut, dass chemische Vorbehandlungsschritte vor dem Einbringen in die Phosphorsäure und den Alkohol enthaltende Lösung entfallen können und aus Ökonomiegründen auch vorteilhafterweise wegfallen sollten. Die zu behandelnden Oberflächen können also direkt und trocken eingebracht werden.The cleaning effect of the method according to the invention is so thorough and broad scattered that chemical pretreatment steps before incorporation into the phosphoric acid and the alcohol-containing solution can be dispensed with and for reasons of economy should also advantageously be eliminated. The surfaces to be treated can therefore be applied directly and dry.

Ein besonderer Vorteil der Erfindung liegt außerdem darin, dass sich auch auf regenerierten Legierungen gute Ergebnisse erzielen lassen, insbesondere kein Schlamm entsteht. Die metallischen Verunreinigungen von Regeneratmaterial haben bei konventionellen Verfahren zu erheblichen Problemen in der Reinigung geführt und häufig eine Reinigung und nachfolgende gute Beschichtung ganz verhindert.A particular advantage of the invention lies in the fact that it can also regenerate Alloys give good results, especially no sludge arises. The metallic contaminants from regenerated material have with conventional Procedures led to significant problems in cleaning and often cleaning and subsequent good coating completely prevented.

Eine bevorzugte Anwendung der Erfindung liegt in der Vorbereitung von Zinklegierungsoberflächen für eine anschließende Beschichtung beliebiger Art. Für die Qualität der Beschichtung kommt es auf die Sauberkeit der Oberfläche wesentlich an, und zwar sowohl im Hinblick auf die optischen Eigenschaften als auch auf die Belastbarkeit der Beschichtung. Insbesondere bezieht sich die Erfindung dabei auf eine anschließende Metallisierung, die galvanisch oder außenstromlos erfolgen kann. Insoweit richtet sich die Erfindung auch auf das Gesamtverfahren aus der beschriebenen Reinigung und Passivierung und der nachfolgenden Beschichtung, insbesondere Metallisierung.A preferred application of the invention is in the preparation of zinc alloy surfaces for a subsequent coating of any kind. For the quality the coating depends on the cleanliness of the surface, and both in terms of the optical properties and the resilience the coating. In particular, the invention relates to a subsequent one Metallization that can be done galvanically or without external current. in this respect The invention is also directed to the overall process from that described Cleaning and passivation and the subsequent coating, in particular Metallization.

Im Folgenden werden zwei Ausführungsbeispiele für die Erfindung beschrieben, wobei dabei offenbarte Einzelmerkmale auch in anderen Kombinationen erfindungswesentlich sein können.Two exemplary embodiments of the invention are described below, wherein individual features disclosed are also essential to the invention in other combinations could be.

Als typisches Beispiel wird ein Teil aus einer Standard-Zinkdruckgusslegierung (in Frage kommen z.B. die Legierungen Z400 bis Z430) ohne.weitere chemische Reinigung trocken in ein Bad aus 60 prozentiger Phosphorsäure (H3PO4) mit 40 Vol.% Butanol eingebracht, und zwar anodisch gepolt. Die Stromdichte liegt beispielsweise bei 20 A/m2 bei einer Temperatur von 25° C und einer Behandlungszeit, die etwa bei 30 s liegen kann.As a typical example, a part made of a standard zinc die-cast alloy (for example, the alloys Z400 to Z430) is put into a bath made of 60 percent phosphoric acid (H 3 PO 4 ) with 40 vol poled anodically. The current density is, for example, 20 A / m 2 at a temperature of 25 ° C. and a treatment time that can be approximately 30 s.

Danach werden die Teile in neutralem Wasser (pH ca. 7) gespült. Die Oberfläche ist nun passiviert und kann in konventioneller Weise metallisiert werden. Bei dem Ausführungsbeispiel wird dazu eine elektrolytische Beschichtung mit Ni oder Cu oder einer Legierung daraus gewählt.The parts are then rinsed in neutral water (pH approx. 7). The surface is now passivated and can be metallized in a conventional manner. In the embodiment an electrolytic coating with Ni or Cu or an alloy selected from it.

Da die Zinklegierungen aus einem Druckgussverfahren stammen, sind sie in der Regel mit Formtrennmitteln kontaminiert. Auch diese werden bei den dargestellten Reinigungsverfahren zuverlässig und vollständig entfernt.Since the zinc alloys come from a die casting process, they are usually contaminated with mold release agents. These are also used in the cleaning processes shown removed reliably and completely.

Claims (13)

  1. Method of cleaning zinc or zinc alloy surfaces of die cast components, in which the surface is passivated, characterised by a treatment step in a solution, which contains phosphoric acid and an alcohol, in which the surface is anodically connected.
  2. Method as claimed in Claim 1 including a final neutral rinsing step.
  3. Method as claimed in Claim 1 or 2, in which the solution has a water content of at most 5 % by vol.
  4. Method as claimed in one of the preceding claims, in which the anodic current density is in the range of 10-500 A/m2 during the treatment step in the solution with phosphoric acid, in which the surface is of anodic polarity.
  5. Method as claimed in one of the preceding claims, in which the temperature of the solution is between 10° and 40°C during the treatment step in the solution with phosphoric acid, in which the surface is of anodic polarity.
  6. Method as claimed in one of the preceding claims, in which the total treatment time is between 10 seconds and 5 minutes in the treatment step in the solution with phosphoric acid, in which the surface is of anodic polarity.
  7. Method as claimed in one of the preceding claims, in which the phosphoric acid content is in the range of 30-90 % by vol. during the treatment step in the solution with phosphoric acid, in which the surface is of anodic polarity.
  8. Method as claimed in Claim 7, in which the remainder of the solution substantially consists of at least one alcohol.
  9. Method as claimed in Claim 7 or 8, in which the phosphoric acid in the volume constituent is 50-95 percent by weight.
  10. Method as claimed in one of the preceding claims, in which the surface is introduced without chemical pre-treatment into the solution with phosphoric acid and the alcohol.
  11. Method as claimed in one of the preceding claims, in which the zinc alloy consists of reclaimed material.
  12. Method of coating a zinc or zinc alloy surface, in which the surface is initially cleaned and passivated with a method as claimed in one of Claims 1-11 and is then coated.
  13. Method as claimed in Claim 12, in which the coating is a metal coating.
EP02008422A 2002-04-12 2002-04-12 Method for cleaning and passivation of the surfaces of zinc or zincalloys Expired - Lifetime EP1361297B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AT02008422T ATE272133T1 (en) 2002-04-12 2002-04-12 METHOD FOR CLEANING AND PASSIVATION OF ZINC AND ZINC ALLOY SURFACES
DE50200704T DE50200704D1 (en) 2002-04-12 2002-04-12 Process for cleaning and passivating zinc and zinc alloy surfaces
EP02008422A EP1361297B1 (en) 2002-04-12 2002-04-12 Method for cleaning and passivation of the surfaces of zinc or zincalloys
PCT/EP2002/010195 WO2003087438A1 (en) 2002-04-12 2002-09-11 Method for cleaning and passivating zinc and zinc alloy surfaces
AU2002329277A AU2002329277A1 (en) 2002-04-12 2002-09-11 Method for cleaning and passivating zinc and zinc alloy surfaces

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Application Number Priority Date Filing Date Title
EP02008422A EP1361297B1 (en) 2002-04-12 2002-04-12 Method for cleaning and passivation of the surfaces of zinc or zincalloys

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EP1361297A1 EP1361297A1 (en) 2003-11-12
EP1361297B1 true EP1361297B1 (en) 2004-07-28

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EP (1) EP1361297B1 (en)
AT (1) ATE272133T1 (en)
AU (1) AU2002329277A1 (en)
DE (1) DE50200704D1 (en)
WO (1) WO2003087438A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3716462A (en) * 1970-10-05 1973-02-13 D Jensen Copper plating on zinc and its alloys
US3663386A (en) * 1971-02-08 1972-05-16 Basf Wyandotte Corp Electrocleaner composition and process
GB1536177A (en) * 1976-12-07 1978-12-20 Nat Res Dev Anodising a compound semiconductor
JPS60248898A (en) * 1983-06-30 1985-12-09 Chobe Taguchi Derusting solution for electrolysis

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AU2002329277A1 (en) 2003-10-27
ATE272133T1 (en) 2004-08-15
DE50200704D1 (en) 2004-09-02
WO2003087438A1 (en) 2003-10-23
EP1361297A1 (en) 2003-11-12

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