EP1813441B2 - Stationary or cosmetic article of magnesium material - Google Patents

Stationary or cosmetic article of magnesium material Download PDF

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Publication number
EP1813441B2
EP1813441B2 EP06001569A EP06001569A EP1813441B2 EP 1813441 B2 EP1813441 B2 EP 1813441B2 EP 06001569 A EP06001569 A EP 06001569A EP 06001569 A EP06001569 A EP 06001569A EP 1813441 B2 EP1813441 B2 EP 1813441B2
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Prior art keywords
metal
magnesium material
oxide
layer
office
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EP06001569A
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German (de)
French (fr)
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EP1813441A1 (en
EP1813441B1 (en
Inventor
Fritz Lüttgens
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KUM Ltd
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KUM Ltd
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Priority to DE502006001234T priority Critical patent/DE502006001234D1/en
Priority to EP06001569A priority patent/EP1813441B2/en
Priority to PL06001569T priority patent/PL1813441T3/en
Priority to US11/698,313 priority patent/US20070172679A1/en
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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
    • C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L23/00—Sharpeners for pencils or leads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L23/00—Sharpeners for pencils or leads
    • B43L23/08—Sharpeners for pencils or leads in which the pencils or leads are sharpened mainly by rotational movement against cutting blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L7/00—Straightedges
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D34/00—Containers or accessories specially adapted for handling liquid toiletry or cosmetic substances, e.g. perfumes

Definitions

  • the invention relates to an office or cosmetic article made of a magnesium material.
  • the invention relates to a sharpener body, a ruler or a cosmetic container made of a magnesium material.
  • Office supplies and cosmetics such as in particular a sharpener body, a ruler or a cosmetic container made of a magnesium material are known in principle.
  • a magnesium material is used as a material due to its easy machinability and low density.
  • a magnesium material is understood here to mean both a magnesium alloy and pure magnesium.
  • magnesium alloys as alloying components usually contain small additions of aluminum, manganese, zinc, copper and / or nickel.
  • a cosmetic container made of a magnesium alloy containing preferably 9% aluminum, 2% zinc and 0.2% manganese is known.
  • the proposed magnesium alloy is intended to enable a shape-consuming design of the cosmetic container with a simultaneously thin-walled design.
  • a ruler with a recessed edge is indicated. Due to the recessed edge, in particular abrasion of a pencil lead, which moves away from the edge of the ruler for the purpose of line management, is avoided.
  • the proposed ruler is preferably made of a light metal, such as a magnesium or aluminum alloy.
  • a magnesium material shows an undesirable tendency to oxidize. Over time, this leads to undesirable color changes and, in particular, unsightly efflorescence in office articles made from a magnesium material. In order to prevent this it is known, for example, to seal the surface of such office products made of a magnesium material with a lacquer. (see. DE-A-10127770 ).
  • Protective layers for magnesium materials are also in the publication "Protective Coatings on Magnesium and Its Alloys - a Critical Review" - Journal of Alloys and Compounds, 336, 2002, pages 88 ff ., Elseview Science Verlag.
  • An aluminum alloy does not represent an equivalent alternative to a magnesium material in a mass-produced article such as an office article, since an aluminum alloy can be machined much less easily. This leads to intolerable additional costs.
  • the use of an alloy suitable for a casting process, for example of iron, instead of a magnesium material is not a cheap alternative, since the necessary molds are expensive and also have only a limited life. For deburring and surface finishing, castings also require a reworking process.
  • an office or cosmetics article of a magnesium material such as in particular a sharpener body or a ruler, which has an inorganic and chemical tethered protective layer comprising at least one element which is selected from the group comprising the metals of the main groups III, IV, V and VI and the subgroups Ib, IVb, Vb, VIb, VIIb and VIIIb of the Periodic Table of the Elements and oxides, ceramics, nitrides, carbides, silicides and borides thereof.
  • the magnesium material office supplies as. Metal an aluminum, a titanium or a vanadium and applied as metal oxide, an aluminum oxide, a titanium oxide or a vanadium oxide.
  • a protective layer makes it possible to produce an office article in the usual way by machining a magnesium material and then giving it the appearance of a metal oxide, matt, glossy surface.
  • the corrosion protection of the magnesium material is controlled by a defined adjustment of the thickness of the metal oxide layer.
  • the applied metal layer can be anodized, whereby a certain color is possible.
  • the surface of the office article generally needs to be cleaned from the oxide layer formed by the magnesium material. This can be done, for example, by dipping the office article in a suitable acid, such as in particular acetic acid or nitric acid. Subsequently, the office or cosmetic articles can be rinsed and the metallic surface applied, for example, by reductive or electrolytic deposition of metal cations. Instead of an acid, the oxide layer can also be removed by a solution of a suitable metal salt.
  • a suitable acid such as in particular acetic acid or nitric acid.
  • a protective layer comprising a first layer of metal and a second layer of metal oxide is applied in one operation by immersing the office or cosmetics article in a solution of a metal salt of a suitable pH. It has been found that in a first step by an appropriate acid, an existing oxide layer is removed from the magnesium material: As soon as magnesium is exposed, the metal precipitates thereon from the solution. The applied metal is then oxidized again in the sense of an anodization by a suitable oxidizing agent or by an oxidizing counteranion. Thus, it is possible in a single step to provide the made of a magnesium material office supplies with a permanent protective layer of a metal and a metal oxide.
  • the invention is based on the consideration that a lacquer for sealing the surface of an office article made of a magnesium material does not have sufficient bonding to the magnesium material. Especially in an office use in constant use, this leads in particular to heavily used areas to rapid abrasion or bursting of the paint layer, so that the office article is overall unsightly and also the now exposed magnesium material in turn tends to oxidation.
  • the invention now proceeds in a further step from the recognition that a chemical attachment is associated with stronger binding forces than a physical attachment.
  • a lacquer layer adheres to a body in particular by adhesion and / or by microscopic positive connection.
  • the disadvantages associated with this physical connection are overcome by the fact that the office article made of a magnesium material obtains a protective layer of an inorganic composition that is chemically connectable to the magnesium material.
  • the invention has the further advantage that the chemically bonded protective layer of the same effect is substantially thinner than a known lacquer. Thus, less material is used overall, which is associated with a cost advantage. Also, the materials used can easily be recycled.
  • the protective layer is connected via a metallic bond with the office / cosmetics.
  • a mixed phase can occur in particular between the metal alloy and the metal applied as a protective layer.
  • Suitable metal layers can be obtained, for example, by reductive-electrodeposition of metal cations, Metallates and / or metal complexes are produced on the surface of the office / cosmetic article.
  • suitable reaction media such as complexing agents or solvents such metal layers can be deposited on the magnesium material independently of the electrochemical series of voltages. The application is done here, for example, by a simple dipping process.
  • a metal oxide or a mixed metal oxide of the metals mentioned can be produced here by the simultaneous addition of a suitable oxidizing agent or by the selection of suitable counteranions on the surface of the office or cosmetic article from the magnesium material.
  • nitrides, carbides, silicides, and borides are understood to mean those chemical compositions or compounds of the mentioned metals which contain nitrogen, carbon, silicon or boron. It does not have to be a stoichiometric composition.
  • Both the protective layer as such and any transition phase present between the protective layer and the magnesium material may be of stoichiometric or non-stoichiometric composition.
  • a chemical linkage can be made by occupying the lattice sites with foreign atoms or by incorporating them into the volume of existing lattice structures.
  • the magnesium material is chemically bonded to a first layer of a metal and a second layer of a metal oxide.
  • the metal oxide layer may be, for example, a passivation layer for the underlying metal layer, while the metal implements the chemical bond.
  • FIG. 1 a sharpener body 1 with a pin guide channel 2 and a sharpener blade 3 mounted thereon is shown.
  • the sharpener body 1 which was massively produced from a magnesium alloy by machining, was then immersed in an acetic acid aluminum nitrate solution.
  • an aluminum layer 12 is deposited on the exposed magnesium of the magnesium alloy in a reductive manner.
  • the deposited aluminum layer 12 is further anodized in one operation by the nitrate, so that an aluminum oxide layer 13 is formed on the aluminum layer 12.
  • The comprising the aluminum layer 12 and the aluminum oxide layer 13.
  • Protective layer 9 provides lasting protection against corrosion of the magnesium alloy.
  • the layer thickness can be adjusted by the pH of the acetic aluminum nitrate solution and by the duration of the coating process.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Description

Die Erfindung betrifft einen Büro- oder Kosmetikartikel aus einem Magnesiumwerkstoff. Insbesondere betrifft die Erfindung einen Spitzerkörper, ein Lineal oder ein Kosmetikbehältnis aus einem Magnesiumwerkstoff.The invention relates to an office or cosmetic article made of a magnesium material. In particular, the invention relates to a sharpener body, a ruler or a cosmetic container made of a magnesium material.

Büroartikel und Kosmetikartikel wie insbesondere ein Spitzerkörper, ein Lineal oder ein Kosmetikbehältnis aus einem Magnesiumwerkstoff sind grundsätzlich bekannt. Ein Magnesiumwerkstoff kommt dabei als Werkstoff auf Grund seiner leichten spanenden Bearbeitbarkeit und seiner geringen Dichte zum Einsatz. Unter einem Magnesiumwerkstoff wird hierbei sowohl eine Magnesiumlegierung als auch reines Magnesium verstanden. Zur Verbesserung der mechanischen Verarbeitbarkeit, der Härte und der Oxidationsneigung des Magnesiums enthalten Magnesiumlegierungen als Legierungskomponenten üblicherweise geringe Zusätze an Aluminium, Mangan, Zink, Kupfer und/oder Nickel.Office supplies and cosmetics such as in particular a sharpener body, a ruler or a cosmetic container made of a magnesium material are known in principle. A magnesium material is used as a material due to its easy machinability and low density. A magnesium material is understood here to mean both a magnesium alloy and pure magnesium. To improve the mechanical processability, the hardness and the tendency to oxidize magnesium, magnesium alloys as alloying components usually contain small additions of aluminum, manganese, zinc, copper and / or nickel.

Aus der JP 2000 201728 A ist ein Kosmetikbehältnis bekannt, das aus einer Magnesiumlegierung gefertigt ist, die vorzugsweise 9% Aluminium, 2% Zink und 0,2% Mangan enthält. Durch die vorgeschlagene Magnesiumlegierung soll ein bezüglich der Form aufwändiges Design des Kosmetikbehältnisses bei gleichzeitig dünnwandiger Ausgestaltung ermöglicht werden.From the JP 2000 201728 A For example, a cosmetic container made of a magnesium alloy containing preferably 9% aluminum, 2% zinc and 0.2% manganese is known. The proposed magnesium alloy is intended to enable a shape-consuming design of the cosmetic container with a simultaneously thin-walled design.

In der US-A-2 562 348 ist zur Verringerung der Abnutzung eines Schreibinstruments, z.B. eines Bleistifts, ein Lineal mit einer zurückversetzten Kante angegeben. Durch die zurückversetzte Kante wird insbesondere ein Abrieb einer Bleistiftmine, welche zur Linienführung die Kante des Lineals abfährt, vermieden. Das vorgeschlagene Lineal ist dabei vorzugsweise aus einem Leichtmetall, wie einer Magnesium- oder Aluminium-Legierung gefertigt.In the US-A-2 562 348 For example, to reduce the wear of a writing instrument such as a pencil, a ruler with a recessed edge is indicated. Due to the recessed edge, in particular abrasion of a pencil lead, which moves away from the edge of the ruler for the purpose of line management, is avoided. The proposed ruler is preferably made of a light metal, such as a magnesium or aluminum alloy.

Nachteiligerweise zeigt ein Magnesiumwerkstoff eine unerwünschte Oxidationsneigung. Dies führt bei Büroartikeln aus einem Magnesiumwerkstoff im Laufe der Zeit zu unerwünschten Farbveränderungen und insbesondere unschönen Ausblühungen. Um dies zu verhindern ist es beispielsweise bekannt, die Oberfläche derartiger aus einem Magnesiumwerkstoff gefertigter Büroartikel mit einem Lack zu versiegeln. (vgl. DE-A-10127770 ). Schutzschichten für Magnesiumwerkstoffe sind darüberhinaus in der Veröffentlichung "Protective coatings" on magnesium and its alloys - a critical review" - Journal of Alloys and Compounds, 336, 2002, Seiten 88 ff ., Elseview Science Verlag beschrieben. Durch den häufigen Gebrauch eines Büroartikels findet jedoch ein rascher Verschleiß eines derartigen auf organischen Substanzen beruhenden Lackes statt, so dass auch ein lackierter Büroartikel rasch unansehnlich wird. Eine Aluminiumlegierung stellt bei einer Massenware wie bei einem Büroartikel keine gleichwertige Alternative zu einem Magnesiumwerkstoff dar, da sich eine Aluminiumlegierung wesentlich schlechter spanend bearbeiten lässt. Dies führt zu nicht tolerierbaren Mehrkosten. Auch der Einsatz einer für ein Gussverfahren geeigneten Legierung, z.B. des Eisens, anstelle eines Magnesiumwerkstoffs stellt keine günstige Alternative dar, da die notwendigen Gussformen teuer sind und zudem nur eine begrenzte Lebensdauer aufweisen. Zum Entgraten und zur Oberflächenveredelung bedürfen Gussteile zudem eines Nachbearbeitungsvorganges.Disadvantageously, a magnesium material shows an undesirable tendency to oxidize. Over time, this leads to undesirable color changes and, in particular, unsightly efflorescence in office articles made from a magnesium material. In order to prevent this it is known, for example, to seal the surface of such office products made of a magnesium material with a lacquer. (see. DE-A-10127770 ). Protective layers for magnesium materials are also in the publication "Protective Coatings on Magnesium and Its Alloys - a Critical Review" - Journal of Alloys and Compounds, 336, 2002, pages 88 ff ., Elseview Science Verlag. However, frequent use of an office article causes rapid wear of such an organic-based paint, so that even a painted office article quickly becomes unsightly. An aluminum alloy does not represent an equivalent alternative to a magnesium material in a mass-produced article such as an office article, since an aluminum alloy can be machined much less easily. This leads to intolerable additional costs. The use of an alloy suitable for a casting process, for example of iron, instead of a magnesium material is not a cheap alternative, since the necessary molds are expensive and also have only a limited life. For deburring and surface finishing, castings also require a reworking process.

Es ist Aufgabe der Erfindung, einen Büro- oder Kosmetikartikel aus einem Magnesiumwerkstoff anzugeben, der eine möglichst lange Lebensdauer ohne unschöne Veränderungen auf seiner Oberfläche aufweist.It is an object of the invention to provide an office or cosmetics article of a magnesium material, which has the longest possible life without unsightly changes on its surface.

Diese Aufgabe wird erfindungsgemäß gelöst durch einen Büro- oder Kosmetikartikel aus einem Magnesiumwerkstoff, wie insbesondere einem Spitzerkörper oder einem Lineal, der eine anorganische und chemische angebundene Schutzschicht aufweist, die wenigstens ein Element umfasst, welches ausgewählt ist aus der Gruppe, die die Metalle der Hauptgruppen III, IV, V und VI und der Nebengruppen Ib, IVb, Vb, VIb, Vllb und VIIIb des Periodensystems der Elemente sowie Oxide, Keramiken, Nitride, Carbide, Silizide und Boride hiervon enthält.This object is achieved according to the invention by an office or cosmetics article of a magnesium material, such as in particular a sharpener body or a ruler, which has an inorganic and chemical tethered protective layer comprising at least one element which is selected from the group comprising the metals of the main groups III, IV, V and VI and the subgroups Ib, IVb, Vb, VIb, VIIb and VIIIb of the Periodic Table of the Elements and oxides, ceramics, nitrides, carbides, silicides and borides thereof.

Es ist dem aus dem Magnesiumwerkstoff gefertigten Büroartikel als. Metall ein Aluminium, ein Titan oder ein Vanadium und als Metalloxid ein Aluminiumoxid, ein Titanoxid bzw. ein Vanadiumoxid aufgebracht. Durch eine derartige Schutzschicht wird es ermöglicht, einen Büroartikel in gewohnter Weise durch spanendes Bearbeiten eines Magnesiumwerkstoffs herzustellen und ihm anschließend den Anschein einer metalloxidischen mattglänzenden Oberfläche zu vermitteln. Dabei wird der Korrosionsschutz des Magnesiumwerkstoff durch eine definierte Einstellung der Dicke der Metalloxidschicht kontrolliert. Mit anderen Worten kann die aufgebrachte Metallschicht eloxiert werden, wobei auch eine gewisse Farbgebung möglich ist.It is the made of the magnesium material office supplies as. Metal an aluminum, a titanium or a vanadium and applied as metal oxide, an aluminum oxide, a titanium oxide or a vanadium oxide. Such a protective layer makes it possible to produce an office article in the usual way by machining a magnesium material and then giving it the appearance of a metal oxide, matt, glossy surface. The corrosion protection of the magnesium material is controlled by a defined adjustment of the thickness of the metal oxide layer. In other words, the applied metal layer can be anodized, whereby a certain color is possible.

Zum Aufbringen einer Metallschicht muss in der Regel die Oberfläche des Büroartikels von der Oxidschicht, die der Magnesiumwerkstoff ausgebildet hat, gereinigt werden. Dies kann beispielsweise durch Eintauchen des Büroartikels in eine geeignete Säure, wie insbesondere Essigsäure oder Salpetersäure geschehen. Anschließend kann der Büro- oder Kosmetikartikel gespült und die metallische Oberfläche beispielsweise durch reduktive oder elektrolytische Abscheidung von Metallkationen aufgebracht werden. Anstelle einer Säure kann die Oxidschicht auch durch eine Lösung eines geeigneten Metallsalzes entfernt werden.To apply a metal layer, the surface of the office article generally needs to be cleaned from the oxide layer formed by the magnesium material. This can be done, for example, by dipping the office article in a suitable acid, such as in particular acetic acid or nitric acid. Subsequently, the office or cosmetic articles can be rinsed and the metallic surface applied, for example, by reductive or electrolytic deposition of metal cations. Instead of an acid, the oxide layer can also be removed by a solution of a suitable metal salt.

Es wird eine Schutzschicht umfassend eine erste Schicht aus Metall und eine zweite Schicht aus Metalloxid jedoch in einem Arbeitsschritt dadurch aufgebracht, dass der Büro- oder Kosmetikartikel in eine Lösung eines Metallsalzes mit einem angepaßten pH-Wert eingetaucht wird. Es hat sich nämlich gezeigt, dass in einem ersten Schritt durch eine geeignete Säure eine vorhandene Oxidschicht von dem Magnesiumwerkstoff entfernt wird: Sobald Magnesium frei liegt, schlägt sich darauf das Metall aus der Lösung nieder. Das aufgetragene Metall wird anschließend im Sinne einer Eloxierung durch ein geeignetes Oxidationsmittel oder durch ein oxidierendes Gegenanion wiederum oxidiert. Somit gelingt es in einem einzigen Arbeitsschritt den aus einem Magnesiumwerkstoff gefertigten Büroartikel mit einer dauerhaften Schutzschicht aus einem Metall und einem Metalloxid zu versehen.However, a protective layer comprising a first layer of metal and a second layer of metal oxide is applied in one operation by immersing the office or cosmetics article in a solution of a metal salt of a suitable pH. It has been found that in a first step by an appropriate acid, an existing oxide layer is removed from the magnesium material: As soon as magnesium is exposed, the metal precipitates thereon from the solution. The applied metal is then oxidized again in the sense of an anodization by a suitable oxidizing agent or by an oxidizing counteranion. Thus, it is possible in a single step to provide the made of a magnesium material office supplies with a permanent protective layer of a metal and a metal oxide.

Im Falle des Aluminiums gelingt dies durch eine essigsaure AluminumnitratLösung. Die Essigsäure entfernt die Oxidschichten auf dem Magnesiumwerkstoff. Das Nitrat oxidiert das aufgebrachte Aluminium. Gleichzeitig ist eine essigsauere Aluminiumnitrat-Lösung in weiten Bereichen gepuffert, so dass wenig Prozessparameter gesteuert werden müssen. Der Magnesiumwerkstoff kann insbesondere unbehandelt eingetaucht werden. Zusätzlich kann auch hierbei ein Reinigungsschritt vorangestellt werden. Es hat sich insbesondere gezeigt, dass sich durch ein Vorbehandeln in Salpetersäure eine gleichmäßigere Oberfläche erzielen lässt. Durch das Einstellen des pH-Wertes der essigsauren Aluminumnitrat-Lösung lassen sich wahlweise unterschiedliche Matt- und Hochglanzbeschichtungen erreichen.In the case of aluminum, this is achieved by an aluminum acetate nitrate solution. The acetic acid removes the oxide layers on the magnesium material. The nitrate oxidizes the deposited aluminum. At the same time an acetic aluminum nitrate solution is buffered in wide areas, so that little process parameters must be controlled. The magnesium material can be immersed in particular untreated. In addition, a cleaning step can also be preceded here. It has been shown, in particular, that a more uniform surface can be achieved by pretreatment in nitric acid. By adjusting the pH of the acetic aluminum nitrate solution, it is optionally possible to achieve different matt and high-gloss coatings.

Die Erfindung geht dabei von der Überlegung aus, dass ein Lack zur Versiegelung der Oberfläche eines aus einem Magnesiumwerkstoff gefertigten Büroartikels keine genügende Anbindung an den Magnesiumwerkstoff aufweist. Gerade bei einem sich in ständigem Gebrauch befindlichen Büroartikel führt dies insbesondere an stark beanspruchten Stellen zu einem raschen Abrieb oder Aufplatzen der Lackschicht, so dass der Büroartikel insgesamt unansehnlich wird und zudem der nun freiliegende Magnesiumwerkstoff wiederum zu einer Oxidierung neigt.The invention is based on the consideration that a lacquer for sealing the surface of an office article made of a magnesium material does not have sufficient bonding to the magnesium material. Especially in an office use in constant use, this leads in particular to heavily used areas to rapid abrasion or bursting of the paint layer, so that the office article is overall unsightly and also the now exposed magnesium material in turn tends to oxidation.

Die Erfindung geht nun in einem weiteren Schritt von der Erkenntnis aus, dass eine chemische Anbindung gegenüber einer physikalischen Anbindung mit stärkeren Bindungskräften verbunden ist. Eine Lackschicht haftet jedoch einem Körper insbesondere durch Adhäsion und/oder durch mikroskopischen Formschluss an. Die mit dieser physikalischen Anbindung verbundenen erkannten Nachteile werden dadurch überwunden, dass der aus einem Magnesiumwerkstoff gefertigte Büroartikel eine Schutzschicht aus einer anorganischen Zusammensetzung erhält, die mit dem Magnesiumwerkstoff chemisch verbindbar ist.The invention now proceeds in a further step from the recognition that a chemical attachment is associated with stronger binding forces than a physical attachment. However, a lacquer layer adheres to a body in particular by adhesion and / or by microscopic positive connection. The disadvantages associated with this physical connection are overcome by the fact that the office article made of a magnesium material obtains a protective layer of an inorganic composition that is chemically connectable to the magnesium material.

Die Erfindung hat den weiteren Vorteil, dass die chemisch angebundene Schutzschicht der gleichen Wirkung wesentlich dünner als ein bekannter Lack ist. Somit wird insgesamt weniger Material eingesetzt, was mit einem Kostenvorteil verbunden ist. Auch können die eingesetzten Materialien leicht einem Recycling-Prozess zugeführt werden.The invention has the further advantage that the chemically bonded protective layer of the same effect is substantially thinner than a known lacquer. Thus, less material is used overall, which is associated with a cost advantage. Also, the materials used can easily be recycled.

Die Schutzschicht ist über eine metallische Bindung mit dem Büro/Kosmetikartikel verbunden. Dabei kann insbesondere zwischen der Metall-Legierung und dem als Schutzschicht aufgebrachten Metall auch eine Mischphase auftreten. Geeignete Metallschichten können beispielsweise durch reduktive-galvanische Abscheidungen von Metallkationen, Metallaten und/oder Metallkomplexen auf der Oberfläche des Büro/Kosmetikartikels hergestellt werden. Durch die Wahl geeigneter Reaktionsmedien wie Komplexbildnern oder Lösungsmitteln könnenderartige Metallschichten unabhängig von der elektrochemischen Spannungsreihe auf dem Magnesiumwerkstoff abgeschieden werden. Das Aufbringen geschieht hierbei beispielsweise durch ein einfaches Tauchverfahren.The protective layer is connected via a metallic bond with the office / cosmetics. In this case, a mixed phase can occur in particular between the metal alloy and the metal applied as a protective layer. Suitable metal layers can be obtained, for example, by reductive-electrodeposition of metal cations, Metallates and / or metal complexes are produced on the surface of the office / cosmetic article. By choosing suitable reaction media such as complexing agents or solvents such metal layers can be deposited on the magnesium material independently of the electrochemical series of voltages. The application is done here, for example, by a simple dipping process.

Ein Metalloxid oder ein Metallmischoxid der erwähnten Metalle kann hierbei durch die gleichzeitige Zugabe eines geeigneten Oxidationsmittels oder durch die Wahl geeigneter Gegenanionen auf der Oberfläche des Büro- oder Kosmetikartikels aus dem Magnesiumwerkstoff erzeugt werden.A metal oxide or a mixed metal oxide of the metals mentioned can be produced here by the simultaneous addition of a suitable oxidizing agent or by the selection of suitable counteranions on the surface of the office or cosmetic article from the magnesium material.

Unter der Bezeichnung Nitride, Carbide, Silizide, und Boride werden solche chemischen Zusammensetzungen oder Verbindungen der erwähnten Metallen verstanden, die Stickstoff, Kohlenstoff, Silizium bzw. Bor enthalten. Es muss sich dabei nicht um eine stöchiometrische Zusammensetzung handeln.The term nitrides, carbides, silicides, and borides are understood to mean those chemical compositions or compounds of the mentioned metals which contain nitrogen, carbon, silicon or boron. It does not have to be a stoichiometric composition.

Sowohl die Schutzschicht als solche als auch eine ggf. zwischen der Schutzschicht und dem Magnesiumwerkstoff vorhandene Übergangsphase kann stöchiometrischer oder nicht-stöchiometrischer Zusammensetzung sein. Somit kann eine chemische Anbindung durch Besetzen der Gitterplätze mit Fremdatomen oder durch Einbau derselben in das Volumen vorhandener Gitterstrukturen erfolgen.Both the protective layer as such and any transition phase present between the protective layer and the magnesium material may be of stoichiometric or non-stoichiometric composition. Thus, a chemical linkage can be made by occupying the lattice sites with foreign atoms or by incorporating them into the volume of existing lattice structures.

Durch die chemische Anbindung der Schutzschicht an den Magnesiumwerkstoff des Büroartikels wird ein dauerhafter Korrosionsschutz erzielt. Das Magnesium ist vor einer Oxidation geschützt.Due to the chemical bonding of the protective layer to the magnesium material of the office article, permanent corrosion protection is achieved. The magnesium is protected against oxidation.

Ferner ist dem Magnesiumwerkstoff als eine Schutzschicht eine erste Schicht aus einem Metall und eine zweite Schicht aus einem Metalloxid chemisch angebunden. Dabei kann die Metalloxidschicht beispielsweise eine Passivierungsschicht für die darunter liegende Metallschicht sein, während das Metall die chemische Anbindung realisiert.Further, as a protective layer, the magnesium material is chemically bonded to a first layer of a metal and a second layer of a metal oxide. The metal oxide layer may be, for example, a passivation layer for the underlying metal layer, while the metal implements the chemical bond.

Ein Ausführungsbeispiel der Erfindung wird anhand einer Zeichnung näher erläutert. Es zeigt

Fig 1
einen Spitzerkörper mit einer Schutzschicht aus Aluminium und einem Aluminiumoxid.
An embodiment of the invention will be explained in more detail with reference to a drawing. It shows
Fig. 1
a sharpener body with a protective layer of aluminum and an alumina.

In Figur 1 ist ein Spitzerkörper 1 mit einem Stiftführungskanal 2 und einer darauf angebrachten Spitzerklinge 3 gezeigt. Der durch spanendes Bearbeiten massiv aus einer Magnesiumlegierung gefertigte Spitzerkörper 1 wurde anschließend in eine essigsauere Aluminumnitrat-Lösung getaucht.In FIG. 1 a sharpener body 1 with a pin guide channel 2 and a sharpener blade 3 mounted thereon is shown. The sharpener body 1, which was massively produced from a magnesium alloy by machining, was then immersed in an acetic acid aluminum nitrate solution.

Die Art der sich ergebenden Beschichtung ist in der vergrößerten Darstellung 7 gezeigt. Nach Entfernen der sich auf dem Spitzerkörper 1 befindlichen Oxidschicht durch die in der Lösung enthaltene Essigsäure wird auf das freiliegende Magnesium der Magnesiumlegierung eine Aluminiumschicht 12 reduktiv abgeschieden. Die abgeschiedene Aluminiumschicht 12 wird in einem Arbeitsgang weiter durch das Nitrat eloxiert, so dass auf der Aluminiumschicht 12 eine Aluminiumoxidschicht 13 entsteht.The nature of the resulting coating is shown in the enlarged view 7. To Removing the oxide layer located on the sharpener body 1 by means of the acetic acid contained in the solution, an aluminum layer 12 is deposited on the exposed magnesium of the magnesium alloy in a reductive manner. The deposited aluminum layer 12 is further anodized in one operation by the nitrate, so that an aluminum oxide layer 13 is formed on the aluminum layer 12.

Die die Aluminiumschicht 12 und die Aluminiumoxidschicht 13 umfassende. Schutzschicht 9 bietet einen dauerhaften Schutz gegen eine Korrosion der Magnesiumlegierung. Die Schichtdicke kann durch den pH-Wert der essigsauren Aluminiumnitrat-Lösung sowie durch die Dauer des Beschichtungsvorganges eingestellt werden.The comprising the aluminum layer 12 and the aluminum oxide layer 13. Protective layer 9 provides lasting protection against corrosion of the magnesium alloy. The layer thickness can be adjusted by the pH of the acetic aluminum nitrate solution and by the duration of the coating process.

Claims (2)

  1. Office or cosmetics article made of a magnesium material, in particular a sharpener body (1), ruler or cosmetics container, having a chemically bonded inorganic protective layer (9) comprising at least one element selected from the group containing the metals of the main groups III, IV, V and VI and the sub-groups Ib, IVb, Vb, VIb, VIIb and VIIIb of the Periodic Table of the Elements, also oxides, ceramics, nitrides, carbides, silicides and borides thereof, wherein the protective layer (9) contains a combination of layers with a different chemical composition, wherein a metal, as a first layer, and a metal oxide, as a second layer, is chemically bonded to the magnesium material, wherein this metal is aluminium, titanium or vanadium and the metal oxide is an aluminium oxide, a titanium oxide or a vanadium oxide and wherein the metal and the metal oxide are applied to the magnesium material by being immersed together in a solution of an appropriate metal salt with an adjusted pH value.
  2. Office or cosmetics article according to claim 1, wherein the aluminium and the aluminium oxide are applied to the magnesium material by being immersed together in an acetic aluminium nitrate solution.
EP06001569A 2006-01-25 2006-01-25 Stationary or cosmetic article of magnesium material Not-in-force EP1813441B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE502006001234T DE502006001234D1 (en) 2006-01-25 2006-01-25 Office or cosmetic articles of a magnesium material
EP06001569A EP1813441B2 (en) 2006-01-25 2006-01-25 Stationary or cosmetic article of magnesium material
PL06001569T PL1813441T3 (en) 2006-01-25 2006-01-25 Stationary or cosmetic article of magnesium material
US11/698,313 US20070172679A1 (en) 2006-01-25 2007-01-25 Office or cosmetics article

Applications Claiming Priority (1)

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EP06001569A EP1813441B2 (en) 2006-01-25 2006-01-25 Stationary or cosmetic article of magnesium material

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EP1813441A1 EP1813441A1 (en) 2007-08-01
EP1813441B1 EP1813441B1 (en) 2008-07-30
EP1813441B2 true EP1813441B2 (en) 2012-11-21

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EP (1) EP1813441B2 (en)
DE (1) DE502006001234D1 (en)
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Publication number Priority date Publication date Assignee Title
USD800834S1 (en) 2015-06-26 2017-10-24 Eisen Gmbh Sharpener
US10064273B2 (en) 2015-10-20 2018-08-28 MR Label Company Antimicrobial copper sheet overlays and related methods for making and using

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US20070172679A1 (en) 2007-07-26
EP1813441A1 (en) 2007-08-01
EP1813441B1 (en) 2008-07-30
DE502006001234D1 (en) 2008-09-11
PL1813441T3 (en) 2009-06-30

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