EP2878712B1 - Bauteil aus Aluminium-Lithium-Legierung, das eine keramische Ummantelung umfasst, und Verfahren zur Herstellung dieser Ummantelung - Google Patents

Bauteil aus Aluminium-Lithium-Legierung, das eine keramische Ummantelung umfasst, und Verfahren zur Herstellung dieser Ummantelung Download PDF

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Publication number
EP2878712B1
EP2878712B1 EP14192317.7A EP14192317A EP2878712B1 EP 2878712 B1 EP2878712 B1 EP 2878712B1 EP 14192317 A EP14192317 A EP 14192317A EP 2878712 B1 EP2878712 B1 EP 2878712B1
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Prior art keywords
component
coating
thickness
lithium
voltage
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English (en)
French (fr)
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EP2878712A1 (de
Inventor
Frédéric Dreyer-Gonzales
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Officine Panerai AG
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Officine Panerai AG
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    • 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
    • C25D11/022—Anodisation on selected surface areas
    • 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
    • C25D11/024—Anodisation under pulsed or modulated current or potential
    • 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
    • C25D11/026—Anodisation with spark discharge
    • 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
    • C25D11/04—Anodisation of aluminium or alloys based thereon
    • 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
    • C25D11/04—Anodisation of aluminium or alloys based thereon
    • C25D11/12—Anodising more than once, e.g. in different baths
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B37/00—Cases
    • G04B37/22—Materials or processes of manufacturing pocket watch or wrist watch cases
    • G04B37/223—Materials or processes of manufacturing pocket watch or wrist watch cases metallic cases coated with a nonmetallic layer
    • 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
    • C25D11/04—Anodisation of aluminium or alloys based thereon
    • C25D11/16—Pretreatment, e.g. desmutting
    • 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
    • C25D11/04—Anodisation of aluminium or alloys based thereon
    • C25D11/18—After-treatment, e.g. pore-sealing

Definitions

  • the present invention relates to a component comprising an aluminum and lithium alloy coated with a ceramic coating. As well as the process for forming the coating.
  • Aluminum alloys containing lithium have interesting properties. Among them we can mention their lightness in comparison to other conventional aluminum alloys. Indeed, lithium is the lightest of the metallic elements and, for each 1% of lithium added to the aluminum alloy makes it possible to reduce by 3% the density of aluminum and to increase by 5% its elastic modulus . This type of alloy also has great resistance to fatigue and corrosion, thus making it possible to extend the life of the product. These alloys are 100% recyclable. Aluminum alloys containing lithium find their applications in the fields of aeronautics, aerospace and in the military.
  • the document EP1818428 describes an electrolytic ceramic coating process for an aluminum alloy.
  • An object of the present invention is to provide a coated component free from the limitations of the known components.
  • these aims are achieved in particular by means of a component comprising an aluminum alloy comprising between 0.1 and 10% by weight of lithium, characterized in that said component is treated using a process of oxidation by plasma micro-arc making it possible to obtain a ceramic coating on the surface of the aluminum alloy and in that the coating has a hardness of between 1800 Hv (17.65 GPa) and 2000 Hv (19.61 GPa).
  • the invention also relates to a method for growing a ceramic coating on the surface of the component, the method being a plasma micro-arc oxidation method and comprising the steps of immersing the component to be coated in an electrolytic bath composed of an aqueous solution of alkali metal hydroxide, the component forming one of the electrodes; and to apply an alternating current having a frequency between 10 Hz to 10,000 Hz, so as to apply a voltage between the component and another electrode varying between 0 V and a value between 100 V and 1000 V.
  • This solution has the particular advantage over the prior art of providing a component having high hardness, excellent resistance to wear, impact, and corrosion.
  • the plasma micro-arc oxidation process is also a technology therefore the environmental impact is low, in particular in view of conventional anodization techniques therefore acid baths are strongly discouraged for environmental protection.
  • a component 1 comprises an aluminum alloy comprising between 0.1 and 10% by weight of lithium.
  • the component is treated using a plasma micro-arc oxidation process (also known under the English name “micro-arc oxidation” and the acronym "MAO") so as to obtain a ceramic coating 2 on the surface of the aluminum alloy.
  • a plasma micro-arc oxidation process also known under the English name “micro-arc oxidation” and the acronym "MAO"
  • the aluminum alloy containing lithium may be one of the commercial alloys available on the market.
  • the aluminum-lithium alloy can include one of the alloys mentioned in table 1.
  • the first line gives the name of the alloy and the left column the element as well as the content of the element in% by weight in the successive columns.
  • Such an aluminum-lithium alloy will therefore contain up to 2.45% by weight of lithium, more particularly between 0.88 and 2.45% by weight of lithium.
  • the figure 1 illustrates an arrangement of an installation, in which a tank 3 contains an electrolytic bath 4. Inside the electrolyte 4 plunges a counter-electrode, or cathode, 5 and an anode which corresponds to the component 1 to be coated. To the figure 1 also shown are a power supply unit 6 capable of generating an alternating current 31.
  • the plasma micro-arc oxidation process comprises the steps of immersing the component 1 to be coated in the electrolyte 4 and passing the alternating current 31 so as to apply a voltage between the component 1 and cathode 5.
  • the electrolyte 4 may comprise an aqueous solution of alkali metal hydroxide, such as potassium or sodium, and an oxyacid salt of an alkali metal.
  • the electrolyte 4 is typically maintained at a temperature between 10 ° C and 55 ° C.
  • the applied current comprises positive and negative current pulses alternating with a frequency between 10 Hz to 10,000 Hz.
  • the amplitude of the current pulses is between 2 and 200 A / dm 2 so as to apply a voltage between component 1 and cathode 5 of the order of 100 V to 1000 V. Indeed, a voltage of 100 and 1000 V makes it possible to create an electrolytic plasma necessary for the formation of the coating 2 on the component 1.
  • the current pulses are separated by a dead time where no current is applied.
  • the duration of the dead time is preferably approximately 10% of the total duration of the current pulse.
  • the duration of the dead time is such that the voltage drops to zero.
  • each of the positive and negative current pulses can have a maximum amplitude followed by a decrease in current to a zero value.
  • the duration of the pulse where the current value is zero is approximately 10% of the total duration of the current pulse.
  • the voltage must drop to zero, that is to say that the voltage is cycled between a base voltage (baseline) and a ceiling voltage, or maximum (ceiling line).
  • the minimum base voltage is preferably adjusted to a voltage between 0 and 99.9% of the maximum peak of the ceiling voltage.
  • the base voltage (for example 30% of the ceiling voltage) will favor the formation of emission of micro electric arcs visible to the naked eye, while a more substantial base voltage (for example 60% of the voltage ceiling), will promote the creation of a continuous plasma, also visible to the naked eye (relating to retinal perception from 0.1 to 0.2 seconds).
  • the influence of the choice of the basic minimum average tensions compared to the maximum tension and thus of the type of micro-arcs obtained thus makes it possible to control a more or less dense and homogeneous layer.
  • the densification of the layer is also subject to the frequency of alternation between the anode and cathode currents. Indeed in the first case the growth of the nanoporous layer will be carried out whereas in the second the densification of the nanoporosities will operate.
  • the growth speed of the coating 1 depends on the type of frequency and the shape of the pulse, in particular the passage between a cathodic and anodic current (and vice-versa) and the current amplitude (and therefore the applied voltage) .
  • the coating growth rate is of the order of 1 micron / minute for an applied voltage of 100 to 400 V and a frequency of the order of 1000 Hz.
  • the thickness of the coating thus obtained can range from a few microns, homogeneously on the part, provided that the setting used to maintain the component in the bath is suitable and does not modify the formation of micro arcs and do not extinguish them,) to a few hundred microns.
  • the plasma micro-arc oxidation process is described, for example, in the document WO03 / 083181 .
  • the figure 2 shows a sectional view of the component with the coating 1 formed by the plasma micro-arc oxidation process.
  • the coating comprises a thick functional ceramic hard layer 21 forming approximately two thirds of the total thickness of the coating 2, and a porous outer layer 22 forming approximately one third of the total thickness of the coating 2
  • the coating 2 is formed partly by the transformation of the substrate material 7 and partly by growth beyond the initial surface 8 of the component (represented by the hatched line in the figure 2 ).
  • the excess thickness of the coating 2 is represented by the difference in thickness between the initial surface 8 and the upper surface of the layer 22.
  • the coating 1 formed by the plasma micro-arc oxidation process on the aluminum-lithium alloy component has a high hardness, close to 2000 Hv. It also has excellent resistance to wear, impact and corrosion.
  • the coating 1 is colored corresponding to the natural coloring of the oxidized aluminum. For example, the coating 1 has a dark brown coloring in the case of the aluminum-lithium alloy 2050 (see table 1).
  • the oxidation process can comprise a preliminary stage of preparation of the surface 8 of the component 1.
  • This stage of preparation can comprise the cleaning and degreasing of the surface 8, for example with boiling water or with an alkaline cleaner such as PARCO cleaner solution (product of Henkel Surface Technologies division of Henkel Corporation, Madison Heights, Michigan).
  • the preparation step can be followed by a rinsing step, for example with distilled water.
  • a tribofinishing step can be performed after the coating 1 has been formed by the oxidation process.
  • This tribofinishing step may include, for example, a micro sandblasting.
  • the figure 3 shows a coating 1 formed by the oxidation process of the invention.
  • Figures 3a and 3c show the coating 2 seen from the front, respectively after its formation ( figure 3a ) and after the tribofinishing step ( figure 3c ).
  • the figure 3b is a sectional view showing the Al-Li alloy substrate 7 and the coating 2.
  • Component 1 to be coated can also come from a conventional shaping process of the machining, bar turning or shaping type by casting process of liquid aluminum (Cobapress process type).
  • the plasma micro-arc oxidation process has been applied to different parts of a watch case made of an aluminum-lithium alloy.
  • the figure 4 illustrates a perspective of such a watch case 9.
  • the covering 1 has been formed on parts of the watch case 9 comprising a middle 91, a middle horn 92, a lever 93, a fixing bridge 94 , a caseback (not visible in the figure), a bezel 95 and a crown cover 96.
  • the Figures 5 to 9 show micrographs of views of a metallographic section of the coatings 2 formed by the oxidation process on the different parts of the watch case 9.
  • the figure 5 shows the coating 2 formed on the lever 93.
  • the figure 6 shows the coating 2 formed on the bezel 95.
  • the figure 7 shows the coating 2 formed on the middle 91.
  • the figure 8 shows the coating 2 formed on the middle of the middle 92.
  • the visible layer in pale gray corresponds to a copper plating layer 10 deposited on the coating for protection purposes during the preparation of the metallographic cut.
  • the portion of component 1 comprises one or more zones comprising a fine structure, for example a thread, holes or threads
  • coating 2 having a thickness that is thinner than on the rest of the surface of component 1.
  • the formation of a thick coating in the fine structuring zones can result in a leveling of the structuring. This is particularly the case when the structure has a dimension of less than 100 ⁇ m.
  • the oxidation process comprises a step of forming the coating 2 on the zone or zones having fine structuring.
  • the zone (s) with the fine structure are then masked so as to be able to form the coating 2 on the rest of the component 1 without affecting the zone (s) having the fine structure.
  • the coating is formed on the rest of the surface of the component 1.
  • the thickness of the coating in the area (s) with fine structuring will depend on the dimension of the structuring.
  • the coating can be formed on the area (s) with fine structure with a thickness of approximately 10% of the dimension of the structure.
  • the zone (s) with fine structure may include threads, holes, tapping, etc.
  • the figure 9 shows a sectional view of a threaded portion of the middle of the middle 92.
  • the thread has a dimension (distance between the valley and the top) of a few tens of microns.
  • the threaded portion, as well as the rest of the middle of the middle 92, was first oxidized according to the oxidation process of the invention so as to form the coating 2 (black layer) with a thickness of a few microns (typically between 1 and 5 ⁇ m).
  • the threaded portion was then masked and the rest of the middle part 92 was again oxidized according to the oxidation process of the invention, making it possible to form the coating 2 with a thickness of several tens to hundreds of microns, such as illustrated in figure 8 .
  • the threaded portion being masked during this step, the coating 2 does not believe in any advantage at this location and its thickness remains unchanged.
  • the coating 2 having a small thickness in the zone (s) with the fine structuring makes it possible to densify and harden these areas without however leveling the structuring.
  • the masking of the area (s) with fine structure can be carried out using silicone seals or any other protective means resistant to the oxidation treatment by plasma micro-arc and which can be eliminated at the end of the process.
  • the graph of the figure 10 reports the measured thicknesses of the coating 2 formed on the different parts of the watch case 9 as discussed above.
  • the bottom line of the graph gives the thickness value.
  • the coating 2 with a thickness of 50 ⁇ m is formed on the middle part 91 and the bottom of the case 9.
  • the coating 2 has a thickness of 45 ⁇ m on the fixing bridge 94 and the crown cover 96, ect.
  • Table 2 reports the thickness measured for the coating 2 formed on the various threads present on the watch case 9, for example, in the threaded axis of the middle part 91, for fixing the lever 93 on the fixing bridge 94 , for fixing the fixing bridge 94 on the middle 91.
  • the three lines 1, 2 and 3 in table 2 correspond to the thickness of the coating 2 measured at the top of three successive threads, as shown in the figure 11 .
  • the graph of the figure 12 summarizes different thickness measurements of the coating 2 at the level of holes and threads of the different elements of the box 9.
  • the figure 16a shows a photograph of a watch case 9 made of aluminum-lithium alloy having undergone the oxidation process of the invention.
  • the figure 16b shows a detail of the housing 9, in particular a portion of the fixing bridge 94, of the lever 93 and of the bezel 95.
  • the figure 13 shows the state of the surface of the watch middle in lithium aluminum alloy on which the coating was formed by the oxidation process of the invention, after 6 hours of wear according to the above test.
  • Fine scratch tests were also carried out.
  • the conditions of these tests included the rotation of the test sample at 90 rpm, in a box with a volume of 0.6 liters with a diameter of 80mm, height of 60mm, blotter wall with 5 to 15 markers and 10g of "bremor BR 650" glass powder.
  • the duration of the test was 24 hours.
  • the figure 17 shows tables 3 and 4 which represent the observations made for different durations of requests from 1 min to 24 hours.
  • the figure 14 shows a micrograph of the condition of the middle surface after 12 hours of fine stripes. These tests show that the ceramization process also provides excellent scratch resistance.
  • Gravel bed drop tests were also carried out using a test method according to ISO 23160, including falls in a gravel bed and ceramic chips of 8 cm by 500 cm 2 of ceramic berlingots in diameter 3 mm, with a length of 12 mm and a hardness of 900HV ⁇ 100Hv.
  • the fall height was 40cm.
  • the watch case to be tested is "loaded" with a counterweight representing the weight of the mechanical movement normally integrated in the watch head. After about ten falls on a gravel / ceramic bed, we observe very slight impacts at the edges, as visible in the figure 14 which shows the surface condition after ten of these drop tests in a 40cm high gravel bed with a weighted frame and a counterweight representing the weight of the mechanical movement. These tests show that the ceramization process also provides excellent resistance to shocks and impacts 40cm on gravel / ceramic bed.
  • Synthetic sweat tests were also carried out. These tests were carried out according to the conditions of the NIHS 96-50 and ISO 3160-2 standards, in which the pieces tested are put on a cotton support soaked in sweat in an environment of 40 ° C ⁇ 2 ° C humidity 95 to 100 % relative humidity duration of the test over 6 days.
  • lithium aluminum provides the following properties: 25% lighter than conventional materials, thus optimizing the design of structural parts and reducing the weight of a watch case, for example, Better resistance to fatigue and corrosion, which makes the product more reliable and longer, 100% recyclable, which makes a major contribution to a sustainable watch industry.
  • the coating 2 obtained by the process of the invention is advantageous for the components of a mechanical watch subjected to friction or mechanical stresses. It is also advantageous to treat components of watchmaking clothing, such as the example of watch case 9 above, which are subjected to aggressive environmental constraints such as wear, humidity, salinity rate (sea, tropical climates or other ). Of course, the component 1 comprising the coating 2 is not only of interest in watchmaking but can also be used in various fields such as eyewear and writing instruments.

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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)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Claims (14)

  1. Bauteil (1), das eine Aluminiumlegierung umfasst, die zwischen 0,1 und 10 Gew.-% Lithium umfasst, dadurch gekennzeichnet, dass das Bauteil (1) mithilfe eines Mikrobogen-Plasmaoxidationsverfahrens behandelt wird, das es ermöglicht, eine keramische Beschichtung (2) auf der Oberfläche der Aluminiumlegierung zu erhalten, und dass die Beschichtung eine Härte zwischen 1800 HV (17,65 GPa) und 2000 HV (19,61 GPa) hat.
  2. Bauteil nach Anspruch 1, bei dem die Beschichtung (2) eine Dicke zwischen 1 µm und 100 µm hat.
  3. Bauteil nach Anspruch 2, das mindestens einen Abschnitt umfasst, der eine Oberflächenstrukturierung mit einem Maß von weniger als 100 µm beinhaltet, und bei dem die Beschichtung eine Dicke zwischen 1 µm und 5 µm hat.
  4. Bauteil nach Anspruch 3, bei dem die Beschichtung eine Dicke zwischen 5 µm und 100 µm über den Rest des Bauteils und bevorzugt zwischen 20 µm und 50 µm über den Rest des Bauteils hat.
  5. Bauteil nach einem der Ansprüche 1 bis 4, das zwischen 0,88 und 2,45 Gew.-% Lithium umfasst.
  6. Bauteil nach einem der Ansprüche 1 bis 5, bei dem die Beschichtung nach einem Fallversuch am Bauteil aus einer Höhe von 40 cm in ein Kiesbett mit zehn Wiederholungen gemäß der Norm ISO 23160 unversehrt ist.
  7. Bauteil nach einem der Ansprüche 1 bis 6, bei dem die Beschichtung eine Oberflächenbeschaffenheit aufweist, die 36 Stunden nach einem Versuch gemäß der Norm ISO 23160 leichte Veränderungen (Index 4) beinhaltet.
  8. Bauteil nach einem der Ansprüche 1 bis 7, das ein Uhrenbauteil, insbesondere ein Gehäusebauteil oder ein Bauteil eines Uhrwerks, ein Bauteil für Brillen oder ein Bauteil für ein Schreibgerät ist.
  9. Verfahren, das es ermöglicht, eine keramische Beschichtung (2) auf der Oberfläche eines Bauteils wachsen zu lassen, das eine Aluminiumlegierung umfasst, die zwischen 0,1 und 10 Gew.-% Lithium umfasst, dadurch gekennzeichnet, dass die Beschichtung eine Härte zwischen 1800 HV (17,65 GPa) und 2000 HV (19,61 GPa) hat und dass das Verfahren ein Mikrobogen-Plasmaoxidationsverfahren ist und Folgendes umfasst:
    Eintauchen des zu beschichtenden Bauteils in ein Elektrolytbad (3), das aus einer wässrigen Alkalimetallhydroxidlösung besteht, wobei das Bauteil eine der Elektroden bildet;
    Anlegen eines Wechselstroms mit einer Frequenz zwischen 10 Hz und 10.000 Hz, so dass eine Spannung zwischen dem Bauteil und einer anderen Elektrode angelegt wird, die zwischen 0 V und einem Wert zwischen 100 V und 1000 V variiert.
  10. Verfahren nach Anspruch 9, bei dem die Dauer des Strompulses, der eine Spannung von 0 V ergibt, 10 % der Gesamtdauer des Pulses beträgt, der eine Spannung zwischen 100 V und 1000 V ergibt.
  11. Verfahren nach Anspruch 9 oder 10, bei dem die mittlere Mindestspannung so eingestellt wird, dass sie zwischen 0 und 99,9 % der Höchstspannung und bevorzugt zwischen 30 % und 60 % der Höchstspannung beträgt.
  12. Verfahren nach einem der Ansprüche 9 bis 11, bei dem ein Bereich des Bauteils (1) eine Feinstrukturierung mit einem Maß von weniger als 100 µm beinhaltet und bei dem das Verfahren ferner umfasst:
    Wachsenlassen der Beschichtung (2) mit einer Dicke zwischen 1 µm und 5 µm;
    Maskieren des Bereichs derart, dass die nachfolgende Anwendung des Verfahrens keine Auswirkung auf den Bereich hat; und
    Wachsenlassen der Beschichtung (2) mit einer Dicke zwischen 5 µm und 100 µm über den Rest der Oberfläche des Bauteils (2).
  13. Verfahren nach einem der Ansprüche 9 bis 12, das ferner eine Oberflächenvorbereitung beinhaltet, die einen Reinigungs- und Entfettungsschritt umfasst.
  14. Verfahren nach einem der Ansprüche 9 bis 13, das ferner einen Mikrosandstrahlschritt beinhaltet.
EP14192317.7A 2013-11-11 2014-11-07 Bauteil aus Aluminium-Lithium-Legierung, das eine keramische Ummantelung umfasst, und Verfahren zur Herstellung dieser Ummantelung Active EP2878712B1 (de)

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CH01881/13A CH708829A1 (fr) 2013-11-11 2013-11-11 Composant en alliage aluminium-lithium comprenant un revêtement céramique et procédé pour former le revêtement.

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EP2878712B1 true EP2878712B1 (de) 2020-05-13

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CN111876811B (zh) * 2020-07-27 2022-02-25 上海交通大学 一种铝锂合金微弧氧化方法及其采用的电解液

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US2998358A (en) * 1957-10-02 1961-08-29 Nippon Light Metal Co Method of forming a colored film on an aluminum alloy
CN100503899C (zh) 2002-03-27 2009-06-24 岛屿涂层有限公司 用于在金属和合金上形成陶瓷涂层的方法和装置及由此方法制得的涂层
WO2005118919A1 (ja) * 2004-11-05 2005-12-15 Nihon Parkerizing Co., Ltd. 金属の電解セラミックコーティング方法、金属の電解セラミックコーティング用電解液および金属材料
GB0500407D0 (en) * 2005-01-10 2005-02-16 Short Brothers Plc Anodising aluminium alloy
US20060207884A1 (en) * 2005-03-17 2006-09-21 Volodymyr Shpakovsky Method of producing corundum layer on metal parts

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