DE102022110375A1 - Layer system, coated substrate comprising the layer system, method for coating the surface of a substrate with the layer system and use of the layer system - Google Patents

Abstract

A layer system is described comprising a DLC layer a) with a layer thickness of ≥ 1.2 µm and a layer b) for generating a thick-film interference with a layer thickness of ≥ 2.6 µm. Also described is a coated substrate comprising the layer system, as well as a method for coating the surface of a substrate with a layer system according to the invention and the use of a layer system according to the invention as an anti-reflective coating and/or as a replacement for an anodized coating.

Description

The present invention relates to a layer system comprising a DLC layer a) with a layer thickness of ≥ 1.5 μm and a layer b) for producing a thick-film interference. The invention further relates to a coated substrate comprising the layer system, as well as a method for coating the surface of a substrate with a layer system according to the invention and the use of a layer system according to the invention as an anti-reflective coating and/or as a replacement for an anodized coating.

The invention is defined in the appended claims. Preferred aspects of the present invention also emerge from the following description including the examples.

To the extent that certain embodiments are described as preferred for an aspect of the invention, the corresponding statements also apply to the other aspects of the present invention, mutatis mutandis. Preferred individual features of aspects of the invention (as defined in the claims and/or disclosed in the description) can be combined with one another and are preferably combined with one another, unless the person skilled in the art knows otherwise from the present text in the individual case.

There is a fundamental need on the market for substrates - in particular metal substrates made of aluminum or aluminum alloys - which have a decorative black coating, that is, have a black appearance. For aluminum substrates, such a black coating or such a black appearance can be achieved, for example, by using an anodizing process and correspondingly creating an anodizing layer on the surface of the aluminum substrate.

However, some aluminum-containing substrates, such as hard aluminum alloys such as EN AW-2024, EN AW-7022 or EN AW-7075, cannot be decoratively anodized due to their high copper and zinc content.

One option for color coating any aluminum-containing substrate (as well as other metal and non-metal substrates) is plasma-enhanced chemical vapor deposition (PE-CVD). If a black color is desired, a diamond-like carbon (DLC) layer can be applied or created on the respective substrate using PE-CVD.

DLC layers are known from the prior art. In this respect, be up US 2018/0299587 A1 referred.

DLC layers absorb across the entire visible spectral range and therefore have a large refractive index. This leads to a large optical reflection. DLC layers can be as highly reflective as anthracite. The dispersion (that is, the dependence of the refractive indices on the wavelength) of DLC layers is so great that the reflected light can take on a greenish color. The average reflection in the visible range is up to approx. 40%, which leads to a metallic appearance of the coating, which differs significantly from a decorative anodized surface and is therefore undesirable.

Other methods of producing a black decorative layer on a substrate also have different disadvantages depending on the method. A black appearance could also be achieved with a black paint finish. However, visually high-quality paints require many painting cycles (up to twelve) to guarantee a flawless surface. A practical option here is to use piano lacquer. However, the low corrosion protection effect and the low abrasion and UV resistance are often a major problem with (piano lacquer) painted components. Furthermore, paints generally cannot preserve the structure of the substrate surface (e.g. a milled structure).

Black ruthenium electroplating results in a similar surface appearance compared to anodizing. However, the price of ruthenium (platinum group element) is very high and highly volatile.

Against this background, it was a primary object of the present invention to provide a decorative coating with a black appearance for substrates, preferably for metal substrates such as aluminum-containing substrates, which overcomes the above-mentioned disadvantages of the coatings known from the prior art, that is to say a resistant one and preferably to provide the most cost-effective coating with a black appearance, which also shows significantly weaker or preferably no metallic-looking reflections compared to layers known from the prior art.

A further object of the present invention was to provide a coated substrate with the corresponding coating.

A further object of the present invention was to provide a method for coating the surface of a substrate with a corresponding coating.

The present invention should also make it possible to use the black appearance coatings to be provided as anti-reflective coatings or as a replacement for an anodized coating.

Further tasks result from the following description and the patent claims.

The primary object of the present invention is achieved by a layer system comprising a DLC layer a) with a layer thickness of ≥ 1.5 µm and a layer b) for generating a thick-film interference with a layer thickness of ≥ 2.6 µm.

In an ex post facto analysis of the subject matter of the invention, it is noticeable that a number of anti-reflective coatings are already known which include a DLC layer and have interference properties.

So revealed, for example US 2017/0166753 A1 an anti-reflective coating for a light-transmissive substrate, the anti-reflective coating comprising a DLC material.

US 2001/0028956 A1 discloses a coated article comprising a substrate and a coating system provided on the substrate, the hydrophobic coating system comprising an anti-reflective layer and a DLC layer.

US 2016/0023941 A1 discloses a glass for use on an electronic display screen comprising a glass substrate, a DLC layer and an anti-reflective layer.

All of the previously known coatings listed above have in common that both the DLC layer and any additional anti-reflective layer are extremely thin and have thicknesses in the range from a few nanometers to a maximum of 100 nanometers. From the small thickness of the previously known coatings listed above, it follows, on the one hand, that they are not suitable for producing a decorative black appearance, since the disclosed thicknesses of the DLC layers are not sufficient to produce such a black appearance (the previously known coatings listed above are due to their intended area of application on transparent substrates such as glass itself designed to be translucent). On the other hand, the previously known extremely thin (anti-reflective) layers or coatings cannot produce thick-film interference. The previously known thin coatings can only produce thin-film interference. The generation of a thin-film interference is not desired in the sense of the present invention, since a thin-film interference, in contrast to a thick-film interference, leads to the appearance of interference colors (that is, to the appearance of any colored reflection), which is suppressed or preferably completely prevented by the present invention should be.

As a result, the person skilled in the art would not have considered any of the above-mentioned disclosures in order to solve the primary task formulated above and the further tasks formulated, since these do not deal with the production of a black layer (but, on the contrary, with the production of a layer that is as translucent as possible ) and for this reason alone cannot be assigned to the present technical field of the invention.

As already mentioned above, layer b) included in the layer system according to the invention serves to generate a thick-film interference, which is obtained in particular by the thickness of layer b) of ≥ 2.6 μm. Thick-film interference in the sense of the present invention is characterized by the fact that no colored reflection can be observed at any angle of incidence if the light source used has a continuous spectrum. The generation of a thick-film interference means that - in contrast to a thin-film interference - no interference colors are generated and so an otherwise expected, e.g. B. greenish, shimmer is suppressed or avoided entirely. The thickness of layer b) is chosen so that the reflection maxima are in the blue, red and green spectral range, which means that any reflection from the layer system according to the invention appears white or colorless to the viewer.

In the context of the present invention, layer b) is always arranged above the DLC layer a), although it cannot be ruled out that one or more further layers are arranged between the DLC layer a) and the layer b). One or more further layers can also be arranged on or above layer b). The subject of the present invention, for example: B. also includes layer systems, wherein between the DLC layer a) and the layer b) and / or on (or above) the layer b) one or more further layers - such as a (for example 10 nm thick) titanium dioxide layer or one (for example 10 nm thick) zinc oxide layer - are arranged.

A layer system according to the invention is preferred, with an organic plasma-polymer intermediate layer c) being arranged between the DLC layer a) and the layer b).

Such an intermediate layer c) makes it easier to apply or implement the comparatively very thick layer b) of 2.6 or more µm. On the other hand, such an intermediate layer c) has an advantageous effect on the adhesive properties of layer b). In the presence of an intermediate layer c), layer b) is less prone to flaking and can withstand greater mechanical and thermal loads.

The application of the intermediate layer c) is preferably carried out with the exclusion of process gases that could oxidatively attack the DLC layer. The intermediate layer c) is particularly preferably applied with the exclusion of oxygen and nitrous oxide as process gases. In other words, preferably no oxidative gases are used to produce the intermediate layer c). More preferably, the intermediate layer c) is an oxidation-stable layer which remains mechanically stable, for example in the event of an oxidative attack.

As already explained above, it was an object of the present invention to reduce or completely prevent the (metallic) reflection of a decorative coating with a black appearance. In this context, a layer system according to the invention is preferred, the layer system being compared to an (otherwise identical) layer system without layer b).
has a mean reflection reduced by 30% to 50% at an angle of incidence of 0°
and or
at an angle of incidence of 40°, the average reflection of s- and p-polarized light is reduced by 30% to 50%
and or
at an angle of incidence of 80°, the mean reflection of s-polarized light is reduced by 10% to 30% and/or the mean reflection of p-polarized light is increased by 20% to 50%,
each measured with light with a wavelength in the range of 380 to 600 nm.

For the purposes of the present invention, the mean is to be understood as the arithmetic mean of the reflection in the entire visible spectral range.

Studies have shown that when the above-mentioned reflection values are set or achieved, a significantly darker shade of black can be achieved and the metallic look usual for DLC layers disappears (completely or almost completely).

A layer system according to the invention is preferred, wherein the layer system (preferably deposited on an aluminum substrate, particularly preferably an aluminum substrate of the EN 6060 T66 specification).
passes the sand trickle test, carried out in accordance with DIN 52348:1985-02
and or
In the Mohs hardness test, carried out according to the DIN standard DIN-EN-15771, a Mohs hardness in the range of 4 to 5 was achieved
and or
has a hardness measured by nanoindentation in the range of 4 to 6 GPa.

The sand trickle test or the sand trickle method, carried out according to DIN 52348:1985-02, is considered to have been passed in the sense of the present invention if, after sprinkling the layer system with the sand - e.g. B. based on microscopic photographs - no flaking or flaking of layer b) can be recorded, so layer b) can withstand being sprinkled with the sand.

The hardness measured by means of nanoindentation (nanoindentation) is preferred, as in the examples of WO 2009/056635 A2 explained, determined.

Correspondingly preferred are layer systems according to the invention which have a certain hardness or a certain minimum adhesion for layer b) of the layer system, since this increases the resistance of the layer system to external (mechanical) influences.

A layer system according to the invention is preferred, wherein
the DLC layer a) has a layer thickness in the range from 1.2 to 5 μm, particularly preferably a layer thickness in the range from 1.4 to 4 μm,
and or
the organic plasma polymer intermediate layer c) has an intermediate layer in the range from 5 to 20 nm, preferably in the range from 10 to 20 nm,
and or
the layer b) has a layer thickness in the range from 2.6 to 3.5 μm, preferably in the range from 2.6 to 3.0 μm.

With these layer thicknesses, layer systems with a particularly advantageous (i) deep black appearance, (ii) adhesion value of layer b) on the other layers, or (iii) with a particularly weak or non-existent color (with a metallic appearance) can be created. Receive reflection. On the other hand, the choice of the above-mentioned layer thicknesses results in a particularly stable layer composite system.

The desired reflection properties of the layer system according to the invention can also be further promoted by selecting or setting a specific refractive index for layer b). In this context, a layer system according to the invention is preferred, with layer b) having a refractive index in the range from 1.35 to 1.8 at a wavelength of 380 to 780 nm.

A layer system according to the invention is preferred, wherein the layers a) to c) are produced by means of PE-CVD using precursor compositions each comprising one or more precursor compounds, the precursor compositions preferably being used for the production of layers a). to c) each comprise at least one precursor compound of the same type, particularly preferably each comprise at least one common precursor compound.

In particular, such layer systems are further preferred, the precursor compositions for the production of layers a) to c) each comprising at least one organosilicon precursor compound as a precursor compound of the same type, preferably an organosilicon precursor compound selected from the group consisting from hexamethyldisiloxane and tetramethylsilane, the precursor compositions for the production of layers a) to c) preferably each comprising hexamethyldisiloxane as a common precursor compound.

By using precursor compositions with partially identical/similar precursor compounds to produce layers a) to c), studies have shown that the adhesive bond between the individual layers of the layer system can be further increased in an advantageous manner. The use of in particular hexamethyldisiloxane and tetramethylsilane as “overlapping” compounds in the precursor compositions for the production of layers a) to c) has proven to be particularly suitable.

A layer system according to the invention is also preferred, wherein
the silicon content of layer a) and/or layer b) and/or layer c) is at least 1.5 atomic percent, each determined using XPS,
and or
the organic plasma polymer intermediate layer c) is an organosilicon layer, preferably made from one or more precursor compounds selected from the group consisting of hexamethyldisiloxane and tetramethylsilane, particularly preferably made from hexamethyldisiloxane,
and or
the layer b) is an SiO _x layer, where x is a number in the range from 1.3 to 2.

There is preferably an enrichment of one or more silicon contents in the boundary region of layers a) and c) and/or b) and c) or a) and b). This supports the connection of the respective layers to one another.

Another of the tasks described above is achieved by a coated substrate comprising the layer system according to the invention or preferably according to the invention (as defined above and in the claims).

A coated substrate according to the invention is preferred, with a plasma polymer layer d) serving as an adhesion promoter being arranged between the surface of the substrate and the DLC layer a), the plasma polymer layer d) preferably being an organosilicon layer, preferably made from one or more precursors -Compounds selected from the group consisting of hexamethyldisiloxane and tetramethylsilane, particularly preferably produced from hexamethyldisiloxane.

Such a plasma polymer layer d) arranged between the surface of the substrate and the DLC layer a) advantageously improves the adhesion between the substrate and the layer system.

Also preferred is a coated substrate according to the invention, the substrate being a metal substrate, preferably selected from the group consisting of aluminum, aluminum alloys, zinc die-cast alloys and magnesium alloys, particularly preferably selected from the group consisting of EN AW-2024, EN AW-7019, EN AW-7021, EN AW-7022, EN AW-7075, Z 400, Z 410, Z 430 and Z 610, wherein the substrate is preferably a metal alloy with a Brinell hardness in the range of HB 80 to HB190.

The present invention therefore also makes it possible to use hard aluminum alloys - which have an Elo xal process remain closed - to be given a deep black color. The use of a hard aluminum alloy as a substrate has the advantage that hard aluminum alloys can be milled, drilled, etc. (that is, processed) at higher speeds. This in turn allows aluminum components to be manufactured much more economically. The combination of a (hard) DLC layer with a hard aluminum substrate also advantageously increases the scratch resistance and durability of aluminum components.

1. I) Bereitstellen des Substrates und gegebenenfalls Säubern der zu beschichtenden Substratoberfläche,
2. II) Applizieren einer DLC-Schicht a), wie oben und in den Ansprüchen definiert,
3. III) ggf. Applizieren einer organischen plasmapolymeren Zwischenschicht c), wie oben und in den Ansprüchen definiert, auf die in Schritt II) erhaltene DLC-Schicht a),
4. IV) Applizieren einer Schicht b), wie oben und in den Ansprüchen definiert, wobei das Applizieren der Schichten a) bis c) mittels PE-CVD unter jeweiligem Einsatz von Precursor-Zusammensetzungen umfassend jeweils ein oder mehrere Precursor-Verbindungen erfolgt.

The tasks described above are also achieved by a method for coating the surface of a substrate with a layer system according to the invention or preferably according to the invention (as defined above and in the claims), the method comprising the following steps:

1. I) preparing the substrate and, if necessary, cleaning the substrate surface to be coated,
2. II) applying a DLC layer a) as defined above and in the claims,
3. III) optionally applying an organic plasma polymer intermediate layer c), as defined above and in the claims, to the DLC layer a) obtained in step II).
4. IV) Applying a layer b) as defined above and in the claims, wherein the layers a) to c) are applied by means of PE-CVD with the respective use of precursor compositions each comprising one or more precursor compounds.

Preference is given to a method according to the invention, wherein the precursor compositions used in steps II) to IV) each comprise at least one precursor compound of the same type, preferably each comprising at least one common precursor compound, preferably the at least one precursor compound of the same type Type in steps II) to IV) is an organosilicon precursor compound, preferably an organosilicon precursor compound selected from the group consisting of hexamethyldisiloxane and tetramethylsilane, with particularly preferably the precursor compositions in steps II) to IV) as common precursors -Compound each include hexamethyldisiloxane.

Also preferred are methods according to the invention,
wherein the substrate is a metal substrate, preferably selected from the group consisting of aluminum, aluminum alloys, zinc die-cast alloys and magnesium alloys, particularly preferably selected from the group consisting of EN AW-2024, EN AW-7019, EN AW-7021, EN AW- 7022, EN AW-7075, Z 400, Z 410, Z 430 and Z 610
wherein the substrate is preferably a metal alloy with a Brinell hardness in the range of HB 80 to HB 190.
and or
comprising between steps I) and II) a step Ia) applying a plasma polymer layer d) preferably an organosilicon layer, preferably made from one or more precursor compounds selected from the group consisting of hexamethyldisiloxane and tetramethylsilane, particularly preferably made from hexamethyldisiloxane.

Part of the invention is also the use of a layer system according to the invention or preferably according to the invention (as defined above and in the claims, as an anti-reflective coating and / or as a replacement for an anodized coating, in particular as a coating for vehicle parts (for example as a coating for the back of motorcycle mirrors), watches, jewelry and/or knives.

Examples:

The invention is explained in more detail below using examples. The examples given below are intended to describe and explain the invention in more detail without limiting its scope.

Example 1 (according to the invention):

An aluminum substrate was coated with a DLC layer using a PE-CVD process. The reactor used had a volume of 360 L and a plasma discharge frequency of 13.56 MHz.

For the coating, the aluminum substrate was placed on the 32 cm × 32 cm plasma electrode and the aluminum substrate was thus switched as a cathode. After pumping down the reactor to a base pressure of 5*10 ^-3 mbar, argon was introduced at a flow of 5 sccm (standard cubic centimeters per minute). The plasma power was adjusted to produce a self-bias voltage of 850 V on the aluminum substrate.

After a process time of 5 minutes, tetramethylsilane (TMS) was admitted into the reactor at a flow of 20 sccm and at the same time the argon flow was set to 0. After 2 minutes one had plasma polymer layer serving as an adhesion promoter is deposited on the substrate.

The self-bias voltage was then lowered to 600 V, the TMS flow was set to 0, and toluene was admitted at a flow of 110 sccm. Additionally, hexamethyldisiloxane (HMDSO) was admitted at 5 sccm. After 20 minutes, a toluene-based DLC layer with a layer thickness of 2.4 µm was deposited.

The self-bias voltage was reduced to 450 V, the toluene flow was set to 0, and oxygen was admitted at a flow of 120 sccm. After 20 seconds, the HMDSO flow was increased to 12 sccm. After a process time of 45 minutes, an SiO _x layer with a layer thickness of 3.5 µm had formed on the DLC layer.

Example 2 (not according to the invention):

An aluminum substrate was coated with a DLC layer as described in Example 1 above, with the coating process being ended after the DLC layer had been deposited (i.e. no SiO _x layer was deposited on the DLC layer).

In 1 the coated ones produced in Examples 1 and 2 are compared (left: coated substrate from Example 1, right: coated substrate from Example 2).

Like based on 1 can be seen, the layer system applied in Example 1 (which, in addition to the DLC layer, also has a 3.5 µm thick SiO _x layer) produces a significant difference compared to the DLC layer applied in Example 2 (without SiO _x layer). deeper black. In addition, the DLC layer applied in Example 2 shows a greenish - metallic-looking - reflection, which is not visible in the layer system applied in Example 1.

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 2018/0299587 A1 [0007]
• US 2017/0166753 A1 [0018]
• US 2001/0028956 A1 [0019]
• US 2016/0023941 A1 [0020]
• WO 2009/056635 A2 [0033]

Claims (15)

Comprehensive shift system a DLC layer a) with a layer thickness of ≥ 1.2 µm and a layer b) to generate a thick-film interference with a layer thickness of ≥ 2.6 µm. Shift system Claim 1 , wherein an organic plasma polymer intermediate layer c) is arranged between the DLC layer a) and the layer b). Layer system according to one of the preceding claims, wherein the layer system is compared to a layer system without layer b) has a mean reflection reduced by 30% to 50% at an angle of incidence of 0° and/or at an angle of incidence of 40°, the average reflection of s- and p-polarized light is reduced by 30% to 50% and or at an angle of incidence of 80°, the mean reflection of s-polarized light is reduced by 10% to 30% and/or the mean reflection of p-polarized light is increased by 20% to 50%, each measured with light with a wavelength in the range of 380 to 600 nm. Layer system according to one of the preceding claims, wherein the layer system passes the sand trickle test, carried out in accordance with DIN 52348:1985-02 and or In the Mohs hardness test, carried out according to the DIN standard DIN-EN-15771, a Mohs hardness in the range of 4 to 5 was achieved and or has a hardness measured by nanoindentation in the range of 4 to 6 GPa. Layer system according to one of the preceding claims, wherein the DLC layer a) has a layer thickness in the range from 1.2 to 5 μm, particularly preferably a layer thickness in the range from 1.4 to 4 μm, and or the organic plasma polymer intermediate layer c) has a layer thickness in the range from 5 to 20 nm, preferably in the range from 10 to 20 nm, and or the layer b) has a layer thickness in the range from 2.6 to 3.5 µm, preferably in the range from 2.6 to 3.0 µm, and or the layer b) has a refractive index in the range from 1.35 to 1.8 at a wavelength of 380 to 780 nm. Layer system according to one of the preceding claims, wherein the production of the layers a) to c) takes place by means of PE-CVD with the respective use of precursor compositions each comprising one or more precursor compounds, the precursor compositions preferably being used for the production of the layers a ) to c) each comprise at least one precursor compound of the same type, particularly preferably each comprise at least one common precursor compound. Shift system Claim 6 , wherein the precursor compositions for the production of layers a) to c) each comprise, as a precursor compound of the same type, at least one organosilicon precursor compound, preferably an organosilicon precursor compound selected from the group consisting of hexamethyldisiloxane and tetramethylsilane, whereby the Precursor compositions for the production of layers a) to c) preferably each comprise hexamethyldisiloxane as a common precursor compound. Layer system according to one of the preceding claims, wherein the silicon content of layer a) and/or layer b) and/or layer c) is at least 1.5 atomic percent, in each case determined by means of XPS, and/or the organic plasma polymers Intermediate layer c) is an organosilicon layer, preferably made from one or more precursor compounds selected from the group consisting of hexamethyldisiloxane and tetramethylsilane, particularly preferably made from hexamethyldisiloxane, and / or layer b) is an SiO _x layer, where x is one Number is in the range of 1.3 to 2. Coated substrate, comprising the layer system according to one of Claims 1 until 8th as a coating. Coated substrate after Claim 9 , wherein between the surface of the substrate and the DLC layer a) a plasma polymer layer d) serving as an adhesion promoter is arranged, the plasma polymer layer d) preferably being an organosilicon layer, preferably made from one or more precursor compounds selected from the group consisting of hexamethyldisiloxane and tetramethylsilane, particularly preferably made from hexamethyldisiloxane. Coated substrate after Claim 9 or 10 , where the substrate is a metal substrate, preferably selected from the group consisting of aluminum, aluminum alloys, zinc die-cast alloys and magnesium alloys, particularly preferably selected from the group consisting of EN AW-2024, EN AW-7019, EN AW-7021, EN AW-7022, EN AW-7075, Z 400, Z 410, Z 430 and Z 610, wherein the substrate is preferably a metal alloy with a Brinell hardness in the range of HB 80 to HB 190. Method for coating the surface of a substrate with a layer system, as in one of Claims 1 until 8th defined, the method comprising the following steps: I) preparing the substrate and optionally cleaning the substrate surface to be coated, II) applying a DLC layer a), as in one of Claims 1 until 8th defined, III) optionally applying an organic plasma polymer intermediate layer c), as in one of Claims 1 until 8th defined, to the DLC layer a) obtained in step II), IV) applying a layer b), as in one of Claims 1 until 8th defined, wherein the layers a) to c) are applied by means of PE-CVD using precursor compositions each comprising one or more precursor compounds. Procedure according to Claim 12 , wherein the precursor compositions used in steps II) to IV) each comprise at least one precursor compound of the same type, preferably each comprising at least one common precursor compound, preferably the at least one precursor compound of the same type in steps II ) to IV) is an organosilicon precursor compound, preferably an organosilicon precursor compound selected from the group consisting of hexamethyldisiloxane and tetramethylsilane, with particularly preferably the precursor compositions in steps II) to IV) each comprising hexamethyldisiloxane as the common precursor compound . Procedure according to Claim 12 or 13 , wherein the substrate is a metal substrate, preferably selected from the group consisting of aluminum, aluminum alloys, zinc die-cast alloys and magnesium alloys, particularly preferably selected from the group consisting of EN AW-2024, EN AW-7019, EN AW-7021, EN AW -7022, EN AW-7075, Z 400, Z 410, Z 430 and Z 610, where the substrate is preferably a metal alloy with a Brinell hardness in the range of HB 80 to HB 190. and/or comprising between steps I) and II) a step Ia) applying a plasma polymer layer d) preferably an organosilicon layer, preferably made from one or more precursor compounds selected from the group consisting of hexamethyldisiloxane and tetramethylsilane, particularly preferably made from Hexamethyldisiloxane. Using a layering system, as in one of the Claims 1 until 8th defined as an anti-reflective coating and/or as a replacement for an anodized coating, in particular as a coating for vehicle parts, watches, jewelry and/or knives.

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