Black composite film layer with wiredrawing textures, preparation method of black composite film layer and bathroom product
By forming a composite structure of nickel layer, chromium layer, transition layer, black plating layer and anti-fingerprint layer on the dark black surface, the problem of the difficulty in presenting brushed texture on the dark black surface is solved, and the corrosion resistance, wear resistance and visual effect are improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-09
- Publication Date
- 2026-04-03
AI Technical Summary
Existing technologies struggle to achieve a fine brushed texture on deep black surfaces, and traditional films have low hardness, making them unsuitable for deep black surface treatment.
A black composite film with a brushed texture is prepared by using a substrate with a nickel layer, a chromium layer, a transition layer, a black coating and an anti-fingerprint layer, and forming a brushed texture through physical vapor deposition and electroplating. Combined with specific target materials and process parameters, a brushed texture black composite film is prepared.
It achieves a clear brushed texture on a deep black surface, improving the corrosion resistance and wear resistance of the film layer, while maintaining a low-key and luxurious visual effect and modern industrial aesthetics.
Smart Images
Figure CN121781150A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of membrane technology, and more particularly to a black composite membrane layer with a brushed texture and its preparation method, for bathroom products. Background Technology
[0002] Currently, bathroom products with a brushed metallic effect typically come in a matte brushed gray. This matte brushed gray usually achieves its delicate metallic texture through a process involving polishing, nickel electroplating, brushing, a gray plating layer, and a matte clear varnish protective layer. However, when applied to dark black surfaces, the high light absorption of dark black itself, combined with the matte clear varnish, makes it difficult for light to be sufficiently reflected and refracted, significantly weakening the visual effect of the brushed lines and making them difficult to clearly display. Therefore, current traditional brushed matte gray surface treatment technologies are limited to light-colored surfaces due to their low film hardness, and cannot be used on dark black surfaces.
[0003] Currently, bathroom products with a deep black surface are generally achieved through baking paint or baking powder technology, but their film thickness is high and cannot achieve a brushed effect.
[0004] Therefore, there is an urgent need for a black composite film with a brushed texture and a deep black appearance, as well as its preparation method. Summary of the Invention
[0005] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of protection of this application.
[0006] In one aspect, this application provides a black composite film layer with a brushed texture, comprising: Substrate; A nickel layer is located on the substrate; A chromium layer, which is situated on top of the nickel layer; A transition layer, which is located on top of the chromium layer; A black plating layer, which is located above the transition layer; and An anti-fingerprint layer is located on top of the black coating; Prior to forming the chromium layer, the nickel layer is subjected to a wire drawing process to form a wire drawing texture on the nickel layer; The transition layer is formed by physical vapor deposition based on a first target material selected from chromium, zirconium, and titanium. The black coating is formed by physical vapor deposition based on a second target material selected from stainless steel, chromium-tungsten, chromium-silicon, chromium-aluminum, and titanium-silicon targets.
[0007] In one exemplary embodiment, the black coating has L=25~27, A=-1~1 and B=-1~1, and a 60° gloss of 20~50 GU.
[0008] In one exemplary embodiment, the thickness of the black coating is 1~2 μm.
[0009] In one exemplary embodiment, the stainless steel target is a 316 stainless steel target.
[0010] In an exemplary embodiment, the mass ratio of the two elements in the chromium-tungsten target, chromium-silicon target, chromium-aluminum target, and titanium-silicon target is in the range of 80:20 to 95:5.
[0011] In one exemplary embodiment, the nickel layer is one or two of a matte nickel layer, a semi-gloss nickel layer, and a glossy nickel layer.
[0012] In one exemplary embodiment, the thickness of the nickel layer is 20~25 μm.
[0013] In one exemplary embodiment, the nickel layer has a 60° gloss level of 80~160 GU.
[0014] In an exemplary embodiment, the thickness of the chromium layer is 0.2~0.3μm, and the material of the chromium layer is trivalent white chromium or trivalent black chromium.
[0015] In one exemplary embodiment, the thickness of the transition layer is 10~50nm.
[0016] In one exemplary embodiment, the thickness of the anti-fingerprint layer is 5~10nm.
[0017] On the other hand, this application provides a method for preparing the above-mentioned black composite film layer, the method comprising the following steps: 1) Pre-treatment of the substrate; 2) The pretreated substrate is plated with nickel to form a nickel layer; 3) The nickel layer is subjected to a wire drawing process to form a wire drawing texture on the nickel layer; 4) The brushed nickel layer is plated with chromium to form a chromium layer; 5) A transition layer is formed on the chromium layer by physical vapor deposition using a first target material selected from chromium, zirconium, and titanium. 6) A black coating is formed on the transition layer by physical vapor deposition using a second target material selected from stainless steel, chromium-tungsten, chromium-silicon, chromium-aluminum, and titanium-silicon targets; and 7) An anti-fingerprint layer is formed on the black coating by physical vapor deposition or spraying.
[0018] In an exemplary embodiment, in step 1), pretreatment of the substrate includes polishing and cleaning the substrate.
[0019] In an exemplary embodiment, in step 2), the nickel plating is performed by electroplating. The nickel plating solution includes 240 g / L to 300 g / L of nickel sulfate, 40 g / L to 55 g / L of nickel chloride, 40 g / L to 50 g / L of boric acid, and 10 to 50 ml / L of a composite additive. The composite additive is selected from two or three of butynediol propoxy ether, sodium allyl sulfonate, and saccharin. The pH range of the nickel plating solution is 3 to 4.5. The current density used for nickel plating is 5 A / dm³. 2 Up to 12A / dm 2 The nickel plating time is 15 to 20 minutes, and the temperature is 55°C to 65°C.
[0020] In an exemplary embodiment, in step 3), the wire drawing process employs a wire drawing wheel with 40 to 120 meshes, and the wire drawing depth is 3 to 5 μm.
[0021] In one exemplary embodiment, in step 4), the chromium plating is performed by electroplating, and the current density used for chromium plating is 8~11 A / dm³. 2 The electroplating time is 5 to 10 minutes.
[0022] In an exemplary embodiment, in step 5), the physical vapor deposition method employs ion plating, which includes placing the substrate obtained in step 4) in a vacuum plating machine and performing glow discharge cleaning on the surface of the substrate; turning on the multi-arc ion plating power supply to perform multi-arc ion plating, with the atmosphere and flow rate as follows: Ar 250~350 sccm; negative bias voltage: -100~-200 V; arc source current: 60~80 A; plating time: 2~5 min.
[0023] In an exemplary embodiment, in step 6), the physical vapor deposition method employs magnetron sputtering, including turning off the multi-arc ion plating power supply, turning on the medium-frequency magnetron sputtering power supply, maintaining the vacuum chamber temperature at 100~150℃, and using the following protective atmosphere and flow rate: Ar 200~400 sccm; the reaction atmosphere and flow rate: acetylene or methane 200~500 sccm, with the flow rate ratio of the protective atmosphere to the reaction atmosphere being 1:1~1:2; the working pressure: 0.5~2 Pa; the negative bias voltage: -40~-80V; the target current: 15~40A; and the total coating time: 60~100min. After coating, the workpiece is removed after the temperature drops below 50℃.
[0024] In an exemplary embodiment, in step 7), the physical vapor deposition method employs a vacuum evaporation coating method.
[0025] In another aspect, this application provides a bathroom product having a black composite film layer, wherein the black composite film layer is the aforementioned black composite film layer or is obtained by the aforementioned method.
[0026] In this application, the term "bathroom products" may refer to products whose surface has the black composite film layer with the brushed texture of this application, including but not limited to faucets, showers, and bathroom cabinets.
[0027] The brushed black finish of this application retains the classic black tone while injecting a more layered visual experience into the product through delicate brushed texture and matte finish—it has both an understated luxury and a modern industrial aesthetic.
[0028] The black composite film layer of this application has excellent corrosion resistance and wear resistance.
[0029] Other features and advantages of this application will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the application. Other advantages of this application can be realized and obtained by means of the solutions described in the description and the accompanying drawings. Attached Figure Description
[0030] The accompanying drawings are used to provide an understanding of the technical solutions of this application and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of this application and do not constitute a limitation on the technical solutions of this application.
[0031] Figure 1 This is a schematic cross-sectional view of a black composite film layer provided according to an exemplary embodiment of the present disclosure; Figure 2 The microstructure of a black composite film with a brushed texture obtained according to Example 1 of this disclosure is shown; and Figure 3 A photograph is shown of a valve core sleeve having a black composite membrane layer prepared according to Example 1 of this disclosure. Detailed Implementation
[0032] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application are described in detail below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be arbitrarily combined with each other.
[0033] Unless otherwise specified, all materials used in the following examples and comparative examples are commercially available.
[0034] refer to Figure 1This application provides a black composite film layer, including a substrate 10, a nickel layer 20 on the substrate 10, a chromium layer 30 on the nickel layer 20, a transition layer 40 on the chromium layer 30, a black plating layer 50 on the transition layer 40, and an anti-fingerprint layer 60 on the black plating layer 50.
[0035] In this application, the substrate 10 applicable to this application may include, but is not limited to, stainless steel, aluminum alloy, zinc alloy, copper alloy, and electroplatable plastic with electroplated copper, nickel, or chromium coatings.
[0036] In this application, the substrate 10 can be pretreated. The pretreatment can be carried out using conventional pretreatment methods in the art, such as grinding and polishing, degreasing with acetone and anhydrous ethanol, ultrasonic cleaning, acidic solution cleaning, alkaline solution neutralization, deionized water rinsing, and preservative rinsing.
[0037] Pretreatment can reduce the surface roughness of the substrate, giving it a bright and smooth mirror finish with Ra≤0.8μm.
[0038] In this application, the nickel layer 20 can be composed of one or two of the following: a matte nickel layer, a semi-bright nickel layer, and a fully bright nickel layer. The total thickness of the nickel layer 20 can be 20~25μm. Forming a nickel layer on the substrate can significantly improve the corrosion resistance of the substrate and provide a basic gloss level to the workpiece, with the gloss level in the order of fully bright nickel > semi-bright nickel > matte nickel. The 60° gloss level of the nickel layer 20 can be in the range of 80~160 GU.
[0039] In this application, the nickel layer 20 can be prepared by electroplating. The nickel plating solution used in the electroplating method may include 240 g / L to 300 g / L nickel sulfate, 40 g / L to 55 g / L nickel chloride, 40 g / L to 50 g / L boric acid, and 10-50 ml / L of composite additives. The composite additives may consist of two or three of butynediol propoxy ether, sodium allyl sulfonate (ALS), and saccharin (C6H8O7). The process parameters for nickel plating may include a current density of 5 A / dm³. 2 Up to 12A / dm 2 The electroplating time is 15 to 20 minutes; the temperature is 55°C to 65°C; and the pH range of the nickel plating solution is 3 to 4.5.
[0040] After forming the nickel layer 20, a wire drawing process can be performed on the nickel layer 20 to create a wire drawing texture. The wire drawing process can be performed using abrasive belts (sandpaper), wire drawing wheels, or other methods. A wire drawing wheel with a mesh size of 40-120 can be used. After the wire drawing process, the wire drawing depth on the nickel layer is 3-5 μm.
[0041] A chromium layer 30 is formed on a nickel layer 20 with a brushed texture by electroplating. The thickness of the chromium layer can be 0.2~0.3μm.
[0042] In this application, the chromium plating solution can be either trivalent white chromium or trivalent black chromium. The trivalent white chromium can be one of the following products manufactured by Amtech Chemical Co., Ltd.: Trichrome ICE or Trichrome Plus; the trivalent black chromium can be one of the following products manufactured by Amtech Chemical Co., Ltd.: Trichrome phantom, Trichrome Shadow, Trichrome Titan, or Trichrome Graphite. The electroplating process parameters may include a current density of 8~11 A / dm³. 2 The electroplating time is 5 to 10 minutes.
[0043] In this application, the formation of chromium layer 30 can enhance the corrosion resistance and oxidation resistance of the workpiece, maintain a suitable surface condition for plating, and ensure good connection with subsequent PVD coating processes.
[0044] In this application, the thickness of the transition layer 40 is typically less than the thickness of the chromium layer, and the thickness of the transition layer can be in the range of 10~50 nm. The transition metal layer in this application mainly serves to improve the adhesion between the chromium plating layer and the subsequent PVD black plating layer.
[0045] In this application, a transition layer 40 can be formed in a vacuum environment containing an inert gas by physical vapor deposition based on a first target material selected from chromium, zirconium, and titanium. Physical vapor deposition methods may include ion plating, magnetron sputtering, and vacuum evaporation deposition, etc.
[0046] In this application, the transition layer 40 can be formed by ion plating methods such as multi-arc ion plating.
[0047] Multi-arc ion plating utilizes electric arc discharge to directly generate plasma, which has a high ionization rate, deposition rate and good adhesion, and is suitable for forming the transition layer 40 between the chromium layer and the subsequent PVD coating layer in this application.
[0048] In this application, a black coating 50 can be formed by physical vapor deposition based on a second target. The second target is selected from stainless steel targets, chromium-tungsten targets, chromium-silicon targets, chromium-aluminum targets, and titanium-silicon targets.
[0049] In this application, the mass ratio of the two elements in the chromium-tungsten target, chromium-silicon target, chromium-aluminum target, and titanium-silicon target can be in the range of 80:20 to 95:5. The second target material can be prepared using methods such as smelting or powder metallurgy. For example, when preparing a chromium-silicon target, chromium and silicon powders can be uniformly mixed in a specific ratio, and then powder metallurgy can be used to prepare an alloy with a specific shape as the second target material.
[0050] In this application, a black coating 50 can be formed by magnetron sputtering, such as intermediate frequency magnetron sputtering.
[0051] The black coating formed by the specific target material selected in this application has a LAB value of L=25~27, A=-1~1 and B=-1~1, and a 60° gloss of 20~50GU, showing an excellent deep black gloss effect.
[0052] In this application, the thickness of the black coating can be 1~2μm, thereby highlighting the brushed texture effect.
[0053] In this application, the anti-fingerprint layer 60 can be a nano-anti-fingerprint layer, used to improve the product's anti-fingerprint performance and stain resistance. The material of the anti-fingerprint layer 60 can be a perfluoropolyether type, and it can be deposited on the black coating layer 50 by physical vapor deposition or spraying.
[0054] In this application, the anti-fingerprint layer 60 can be formed by vacuum evaporation deposition.
[0055] The thickness of the anti-fingerprint layer 60 can be in the range of 5~10nm.
[0056] This application also provides a method for preparing a black composite film layer, comprising the following steps: 1) pretreating a substrate; 2) plating nickel onto the pretreated substrate to form a nickel layer; 3) drawing the nickel layer to form a brushed texture on the nickel layer; 4) plating chromium onto the brushed nickel layer to form a chromium layer; 5) forming a transition layer on the chromium layer by physical vapor deposition based on a first target material, wherein the first target material is selected from chromium, zirconium, and titanium; 6) forming a black coating on the transition layer by physical vapor deposition based on a second target material, wherein the second target material is selected from stainless steel target, chromium-tungsten target, chromium-silicon target, chromium-aluminum target, and titanium-silicon target; and 7) forming an anti-fingerprint layer on the black coating by physical vapor deposition or spraying.
[0057] The following examples describe in detail the preparation method of the black composite film layer of this application.
[0058] Example 1 1) Polish the surface of the workpiece substrate (here, the valve core sleeve) to a mirror finish and suitable plating state, and clean the workpiece to remove impurities, oil stains, etc. from the workpiece surface; 2) Place the cleaned workpiece in a nickel plating bath (nickel plating solution composition: 275 g / L nickel sulfate, 45 g / L nickel chloride, 45 g / L boric acid, and 30 ml / L composite additive (15 ml / L butynediol propoxy ether + 15 ml / L sodium allyl sulfonate), pH 3.5) for electroplating a matte nickel layer; the current density is 5 A / dm³. 2 The electroplating time was 20 minutes and the temperature was 55℃. 3) The workpiece after nickel plating is wire-drawn using a 60-mesh wire-drawing wheel with a drawing depth of 4μm; 4) The drawn workpiece is placed in a Trichrome ICE electroplating bath for trivalent white chromium deposition. The current density used for chromium plating is 10A / dm³. 2 The electroplating time is 5 minutes; 5) Place the chromium-plated workpiece in a vacuum coating machine for glow discharge cleaning; turn on the multi-arc ion plating power supply to deposit the transition layer using multi-arc ion plating, with a chromium target as the first target material; atmosphere and flow rate: Ar 300 sccm; negative bias: -100 V; arc source current: 70 A; coating time: 5 min. 6) Turn off the multi-arc ion plating power supply and turn on the medium-frequency magnetron sputtering power supply to deposit a black coating. The process parameters are as follows: the temperature of the vacuum chamber is 100℃; the second target material is a chromium-silicon target (90wt% chromium + 10wt% silicon); protective atmosphere and flow rate: Ar 200 sccm; reaction atmosphere and flow rate: acetylene 250 sccm; working pressure: 1.2 Pa; negative bias voltage: -60V; target current: 15A; total coating time: 80min; after coating, wait for the temperature to drop below 50℃ before removing the workpiece. 7) Place the above workpiece in a vacuum evaporation furnace and deposit an anti-fingerprint layer by evaporation deposition. The deposition time is 20 minutes. The anti-fingerprint layer is made of perfluoropolyether.
[0059] Figure 2 The image shows a scanning electron microscope (SEM) image of the black composite film obtained in this embodiment. The contents of each element in the film were determined by detection as follows: 49.69 wt% C, 12.22 wt% O, 3.51 wt% Si, 33.3 wt% Cr, and 1.28 wt% Ni.
[0060] Figure 3 A photograph of the valve core sleeve with a film layer prepared in this embodiment is shown. As can be seen from the photograph, the valve core sleeve is dark black in color and has a brushed texture on the surface.
[0061] Example 2 The preparation method of Example 2 is basically the same as that of Example 1, but step 2) is different: the cleaned workpiece is placed in a nickel plating bath (the nickel plating bath composition is: 275 g / L nickel sulfate, 45 g / L nickel chloride, 45 g / L boric acid and 30 ml / L composite additive (15 ml / L butynediol propoxy ether + 15 ml / L sodium allyl sulfonate), pH 4) for electroplating a bright nickel layer; the current density is 6 A / dm³. 2 The electroplating time was 20 minutes and the temperature was 55℃.
[0062] Example 3 The preparation method of Example 3 is basically the same as that of Example 1, but step 4) is different: the wire-drawn workpiece is placed in a Trichrome Graphite electroplating bath for trivalent black chromium deposition at a current density of 11 A / dm³. 2 The electroplating time is 5 minutes; Example 4 The preparation method of Example 4 is basically the same as that of Example 1, but step 6) is different: the multi-arc ion plating power supply is turned off, and the medium-frequency magnetron sputtering power supply is turned on to deposit a black coating. The process parameters are as follows: the temperature of the vacuum chamber is 100℃, the second target material is 316 stainless steel target; protective atmosphere and flow rate: Ar 200 sccm; reaction atmosphere and flow rate: methane 200 sccm; working pressure: 1.0 Pa; negative bias voltage: -70V; target current: 10A; total coating time: 60min; after coating is completed, the workpiece is taken out after the temperature drops below 50℃.
[0063] Comparative Example 1 The preparation method of Comparative Example 1 is basically the same as that of Example 1, except that step 4 is omitted.
[0064] Comparative Example 2 The preparation method of Comparative Example 2 is basically the same as that of Example 1, except for step 6): the multi-arc ion plating power supply is turned off, and the medium-frequency magnetron sputtering power supply is turned on to deposit a black coating. The process parameters are as follows: the temperature of the vacuum chamber is 100℃, the target material is a chromium target; the protective atmosphere and flow rate are: Ar 200 sccm; the reaction atmosphere and flow rate are: acetylene 200 sccm; the working pressure is 1.0 Pa; the negative bias voltage is -70V; the target current is 10A; and the total coating time is 60 min. After the coating is completed, the coating is removed after the temperature drops to 50℃.
[0065] Comparative Example 3 The preparation method of Comparative Example 3 is basically the same as that of Example 1, except that step 7 is omitted.
[0066] Performance testing The workpieces obtained in Examples 1-4 and Comparative Examples 1-3 were subjected to the following performance tests: Abrasion resistance test: The test shall be conducted in accordance with the provisions of Appendix D of QB / T 5419-2019, with 2500 cycles of friction.
[0067] Salt spray test: The test shall be conducted in accordance with the provisions of GB / T 10125 and Table 1, with an AASS test duration of 100 h, applied to any 650 mm area on the surface. 2 There should be no more than 2 surface defects within the product, and no more than 3 surface defects within any 25 mm length of the product connection line and parting line. The diameter of the defects should not be greater than 1.6 mm.
[0068] Color difference LAB value test: The LAB value of the product surface is tested with a colorimeter. The average value of 3 points is taken to characterize the color of the product.
[0069] 60° gloss test: The gloss of the product surface at 60° is tested using a gloss meter, and the average value is taken from 3 test points.
[0070] Static contact angle test (contact angle tester): Grade III water conforming to GB / T 6682 is used as reagent. The reagent volume for each test is 4 μL~5 μL. The test is conducted according to Appendix B of JC / T 2168-2013. The arithmetic mean of 5 test points for each sample is taken as the contact angle value of that sample. The test result is expressed as the arithmetic mean of the test results of 3 samples.
[0071] The test results are shown in Table 1 below: Table 1
[0072] As can be seen from the results in Table 1, the workpieces prepared in Examples 1-4 of this application have a dark black appearance, a blackness L value of 26±1, and excellent corrosion resistance. They can all reach level 10 in the acid salt spray test (AASS 100H).
[0073] In addition, judging from the appearance of the workpieces obtained in Examples 1-4 of this application, their LAB values change little, their color difference is small, their process window is stable, and they are suitable for mass production.
[0074] As can be seen from the results of Comparative Example 1, the absence of chromium plating does not affect the product's appearance, but its corrosion resistance is not as good as that of Example 1, with the acid salt spray test (AASS 100H) only reaching level 6. Therefore, the chromium layer of this application can improve the corrosion resistance of the black composite film.
[0075] As can be seen from the results of Comparative Example 2, if a chromium target is used as the target material in step 6), the L value is 35, meaning that the blackness does not reach the ideal value. The composite target material used in this application is the key to depositing a deep black film.
[0076] As can be seen from the results of Comparative Example 3, the anti-fingerprint layer formed by step 7) can effectively improve the product's easy-to-clean performance, i.e., its hydrophobic performance (contact angle > 95°). If step 7) is not performed, the contact angle is only 71°, and the product's easy-to-clean performance, anti-fingerprint performance, and stain resistance will be far lower than those of Example 1.
[0077] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.
Claims
1. A black composite film layer with a brushed texture, characterized in that, include: Substrate; A nickel layer is located on the substrate; A chromium layer, which is situated on top of the nickel layer; A transition layer, which is located on top of the chromium layer; A black coating is placed on top of the transition layer; as well as An anti-fingerprint layer is located on top of the black coating; Prior to forming the chromium layer, the nickel layer is subjected to a wire drawing process to form a wire drawing texture on the nickel layer; The transition layer is formed by physical vapor deposition based on a first target material selected from chromium, zirconium, and titanium. The black coating is formed by physical vapor deposition based on a second target material selected from stainless steel, chromium-tungsten, chromium-silicon, chromium-aluminum, and titanium-silicon targets.
2. The black composite film layer according to claim 1, characterized in that, The black coating has L=25~27, A=-1~1 and B=-1~1, and a 60° gloss of 20~50 GU.
3. The black composite film layer according to claim 1, characterized in that, The thickness of the black coating is 1~2μm; and / or, The stainless steel target material is a 316 stainless steel target material; and / or, The mass ratio of the two elements in the chromium-tungsten target, chromium-silicon target, chromium-aluminum target, and titanium-silicon target is in the range of 80:20 to 95:
5.
4. The black composite film layer according to any one of claims 1-3, characterized in that, The nickel layer is one or two of the following: a matte nickel layer, a semi-gloss nickel layer, and a glossy nickel layer; and / or, The thickness of the nickel layer is 20~25μm; and / or, The nickel layer has a 60° gloss level of 80~160 GU.
5. The black composite film layer according to any one of claims 1-3, characterized in that, The thickness of the chromium layer is 0.2~0.3μm, and the material of the chromium layer is trivalent white chromium or trivalent black chromium; and / or, The thickness of the transition layer is 10~50 nm; and / or, The thickness of the anti-fingerprint layer is 5~10nm.
6. A method for preparing a black composite film layer according to any one of claims 1-5, characterized in that, The method includes the following steps: 1) Pre-treatment of the substrate; 2) The pretreated substrate is plated with nickel to form a nickel layer; 3) The nickel layer is subjected to a wire drawing process to form a wire drawing texture on the nickel layer; 4) The brushed nickel layer is plated with chromium to form a chromium layer; 5) A transition layer is formed on the chromium layer by physical vapor deposition using a first target material selected from chromium, zirconium, and titanium. 6) A black coating is formed on the transition layer by physical vapor deposition using a second target material selected from stainless steel, chromium-tungsten, chromium-silicon, chromium-aluminum, and titanium-silicon targets; and 7) An anti-fingerprint layer is formed on the black coating by physical vapor deposition or spraying.
7. The method according to claim 6, characterized in that, In step 1), pretreatment of the substrate includes polishing and cleaning the substrate; and / or, In step 2), nickel plating is performed using electroplating. The nickel plating solution includes 240 g / L to 300 g / L of nickel sulfate, 40 g / L to 55 g / L of nickel chloride, 40 g / L to 50 g / L of boric acid, and 10-50 ml / L of a composite additive. The composite additive is selected from two or three of butynediol propoxy ether, sodium allyl sulfonate, and saccharin. The pH range of the nickel plating solution is 3 to 4.
5. The current density used for nickel plating is 5 A / dm³. 2 Up to 12A / dm 2 The nickel plating time is 15 to 20 minutes, and the temperature is 55°C to 65°C.
8. The method according to claim 6, characterized in that, In step 3), the drawing process uses a drawing wheel with a mesh size of 40-120, and the drawing depth is 3-5 μm; and / or, In step 4), chromium plating is performed using electroplating, with a current density of 8~11 A / dm³. 2 The electroplating time is 5 to 10 minutes.
9. The method according to any one of claims 6-8, characterized in that, In step 5), the physical vapor deposition method employs ion plating, including placing the substrate obtained in step 4) in a vacuum coating machine and performing glow discharge cleaning on the surface of the substrate; turning on the multi-arc ion plating power supply to perform multi-arc ion plating, with the atmosphere and flow rate as follows: Ar 250~350 sccm; negative bias voltage: -100~-200 V; arc source current: 60~80 A; coating time: 2~5 min; and / or, In step 6), the physical vapor deposition method employs magnetron sputtering, including turning off the multi-arc ion plating power supply and turning on the medium-frequency magnetron sputtering power supply. The temperature of the vacuum chamber is 100~150℃, and the protective atmosphere and flow rate are: Ar 200~400 sccm; the reaction atmosphere and flow rate are: acetylene or methane 200~500 sccm, and the flow rate ratio of the protective atmosphere to the reaction atmosphere is 1:1~1:2; the working pressure is 0.5~2 Pa. Negative bias voltage: -40~-80V; target current: 15~40A; total coating time: 60~100min; after coating, wait for the temperature to drop below 50℃ before removing the workpiece; and / or, In step 7), the physical vapor deposition method employs vacuum evaporation coating.
10. A bathroom product having a black composite film layer, characterized in that, The black composite film layer is the black composite film layer according to any one of claims 1-5 or is prepared by any one of claims 6-9.