Metal composite coating on surface of plastic metallized antenna and preparation method of metal composite coating

Abstract

According to the metal composite coating on the surface of the plastic metallized antenna and the preparation method of the metal composite coating, the metal base layer is deposited on the waveguide surface of the plastic antenna through an evaporation method or a magnetron sputtering method, the binding force of evaporation is high, the film forming effect is good, and the binding strength between the metal composite coating and the plastic antenna is improved. The metal functional layer is deposited on the surface, far away from the waveguide surface, of the metal base layer by adopting an electroplating method, the electroplating can improve the deposition efficiency, the middle functional layer can be accurately regulated and rapidly prepared, the thickness error can be accurately controlled, the deposition rate and the process uniformity are remarkably improved, and the possibility of thermal deformation of the plastic antenna is effectively reduced. The metal composite coating comprises an inert metal protection layer, the inert metal protection layer is made of at least one of silver, platinum or gold, the stability of the inert metal protection layer is high, oxygen can be isolated, and the signal transmission efficiency is stable. Therefore, the metal composite coating is high in adhesive force, good in uniformity and not prone to oxidation.

Description

Technical Field

[0001] The present invention relates to the field of antenna technology, and in particular to a metal composite coating on the surface of a plastic metallized antenna and a preparation method thereof. Background Art

[0002] With the continuous development of new energy vehicles and drones, cost-effective and lightweight plastic metallized antennas are gradually being used in vehicle antennas and drone antennas. Plastic metallized antennas require forming a metal coating on the surface of the plastic antenna substrate to metallize it.

[0003] At present, the metal coating on the surface of the plastic antenna substrate has problems such as poor film thickness uniformity, poor adhesion and easy oxidation, all of which will have an adverse effect on the transmission of communication signals.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute prior art known to ordinary technicians in the field. Summary of the invention

[0005] The purpose of the present invention is to overcome the problems of poor film thickness uniformity, poor adhesion and easy oxidation of the metal coating on the surface of the plastic antenna substrate, and to provide a metal composite coating on the surface of a plastic metallized antenna and a preparation method thereof.

[0006] According to one aspect of the present invention, there is provided a metal composite coating on the surface of a plastic metallized antenna, comprising a metal base layer, a metal functional layer and an inert metal protective layer, wherein the metal base layer is formed on a waveguide surface of a plastic antenna substrate by evaporation or magnetron sputtering, and the material of the metal base layer is at least one of stainless steel, NiCr alloy or NiAl alloy; the metal functional layer is formed on the outer side of the metal base layer by electroplating, and the material of the metal functional layer is at least one of copper, nickel or aluminum; the inert metal protective layer is formed on the outer side of the metal functional layer by electroplating, and the material of the inert metal protective layer is at least one of silver, platinum or gold.

[0007] In one embodiment of the present invention, the thickness of the metal primer layer is 1-3 μm, the thickness of the metal functional layer is 6-8 μm, the thickness of the inert metal protective layer is 1-2 μm, and the thickness of the metal composite coating is 9-12 μm.

[0008] According to another aspect of the present invention, a method for preparing the metal composite coating on the surface of the plastic metallized antenna according to one aspect of the present invention is provided, the method comprising:

[0009] A metal base layer is deposited on the waveguide surface of the plastic antenna substrate by evaporation or magnetron sputtering;

[0010] Depositing a metal functional layer on the side of the metal base layer away from the waveguide surface by electroplating;

[0011] An inert metal protective layer is deposited on a side of the metal functional layer away from the waveguide surface by electroplating.

[0012] In one embodiment of the present invention, a metal base layer is deposited on a waveguide surface of a plastic antenna substrate by evaporation, comprising:

[0013] Using at least one of stainless steel, NiCr alloy or NiAl alloy as raw material, the plastic antenna substrate is placed in a vacuum evaporation chamber for vacuum evaporation, wherein the vacuum evaporation conditions are: vacuum degree <4×10 -3 pa, control the evaporation temperature to 70℃~80℃, control the evaporation current to 50~150A, and the evaporation time to 5~10min;

[0014] After the evaporation is completed, a vacuum annealing treatment is performed. The annealing temperature of the vacuum annealing treatment is 70° C. to 80° C., and the annealing time is 30 min to 60 min.

[0015] In one embodiment of the present invention, a metal base layer is deposited on a waveguide surface of a plastic antenna substrate by magnetron sputtering, comprising:

[0016] The plastic antenna substrate is placed in a magnetron sputtering coating machine. Stainless steel, NiCr alloy, NiAl alloy or pure Cr targets are installed at the symmetrical target positions on both sides of the coating chamber. The vacuum of the coating chamber is evacuated to a vacuum degree of less than 5×10 -3 Pa, the deposition gas Ar is introduced, and the Ar flow rate is 20-40 SCCM;

[0017] The plastic antenna substrate is bombarded with high energy for 5-10 minutes to activate the surface of the plastic antenna substrate, so that metal ions penetrate into the surface of the plastic antenna substrate to form a metal penetration layer. The process parameters during high energy bombardment are: power supply power 60-100W, bias voltage 100-150V, constant temperature 25°C;

[0018] A metal base layer is deposited on the metal infiltration layer. The process parameters during deposition are: power supply 60-100W, bias voltage 20-50V, constant temperature 25°C, and deposition time 15-30min;

[0019] After the deposition is completed, vacuum annealing treatment is performed, the annealing temperature of the vacuum annealing treatment is 70° C. to 80° C., and the annealing time is 30 min to 60 min.

[0020] In one embodiment of the present invention, a metal functional layer is deposited on a side of the metal base layer away from the waveguide surface by electroplating, comprising:

[0021] Copper sulfate, copper pyrophosphate, nickel sulfate or aluminum sulfate and other additive solutions are used as the first electroplating solution. The plastic antenna substrate with a metal base layer is placed in the first electroplating solution for electroplating for 20 to 30 minutes. The current density of the electroplating process is 5 to 15A / dm 2 .

[0022] In one embodiment of the present invention, an inert metal protective layer is deposited on a side of the metal functional layer away from the waveguide surface by electroplating, comprising:

[0023] Silver methanesulfonate and other additive solutions are used as the second electroplating solution, and the plastic antenna substrate with the metal base layer and the metal functional layer is placed in the second electroplating solution for cyanide-free electroplating for 5 to 10 minutes. The current density of the electroplating treatment is 5 to 15 A / dm 2 .

[0024] In one embodiment of the present invention, the components of the first electroplating solution include, by weight: 150-200 parts of copper sulfate, 150-200 parts of copper pyrophosphate, 150-200 parts of nickel sulfate or aluminum sulfate, 40-60 parts of sulfuric acid, and 0.06-0.8 parts of chloride ions.

[0025] In one embodiment of the present invention, the components of the second electroplating solution include, by weight, 150-200 parts of silver methanesulfonate, 150-200 parts of silver carbene sulfonate, 40-60 parts of citric acid, 20-30 parts of sodium dihydrogen phosphate, and 15-30 parts of aminotri(methylene)phosphonic acid.

[0026] In one embodiment of the present invention, the additive includes at least one of a metal brightener, a metal antioxidant, a fog suppressant, a plating layer refiner, a leveler, and a wetting agent.

[0027] The present invention uses an evaporation method or a magnetron sputtering method to deposit a metal base layer on the waveguide surface of a plastic antenna substrate. The evaporation bonding force is high and the film-forming effect is good, thereby improving the bonding strength between the metal composite coating and the plastic antenna substrate. The electroplating method is used to deposit a metal functional layer on the side of the metal base layer away from the waveguide surface. Electroplating can improve the deposition efficiency, significantly improve its deposition rate and process uniformity, and effectively reduce the possibility of thermal deformation of the plastic antenna substrate. The metal composite coating includes an inert metal protective layer. The material of the inert metal protective layer is at least one of silver, platinum or gold. The inert metal protective layer itself has high stability, can isolate oxygen, and has stable signal transmission efficiency. Therefore, the metal composite coating has strong adhesion, good uniformity, and is not easy to oxidize.

[0028] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings herein are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present invention, and together with the specification are used to explain the principles of the present invention. Obviously, the accompanying drawings described below are only some embodiments of the present invention, and for those of ordinary skill in the art, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0030] Figure 1 A cross-sectional view of a plastic antenna substrate and a metal composite coating on its surface provided in an embodiment of the present invention.

[0031] Figure 2 A schematic diagram of the relationship between surface distance and resistance of a composite metal coating provided in an embodiment of the present invention.

[0032] Figure 3 A curve diagram of the standing wave coefficient of the composite metal coating provided in an embodiment of the present invention when the signal output frequency is between 14.5 GHz and 15.35 GHz.

[0033] Figure 4 A schematic flow chart of a method for preparing a metal composite coating on the surface of a plastic metallized antenna provided in an embodiment of the present invention.

[0034] In the figure: 1-plastic antenna substrate, 2-metal composite coating, 21-metal base layer, 22-metal functional layer, 23-inert metal protective layer. DETAILED DESCRIPTION

[0035] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted. In addition, the drawings are only schematic illustrations of the present invention and are not necessarily drawn to scale.

[0036] Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of the diagram to another component, these terms are used in this specification only for convenience, such as according to the direction of the examples in the drawings. It is understood that if the device of the diagram is turned upside down, the component described as "upper" will become the component "lower". When a structure is "on" other structures, it may mean that the structure is formed integrally on the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure through another structure.

[0037] The terms "a", "an", "the", "said" and "at least one" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to express an open-ended inclusive meaning and mean that additional elements / components / etc. may exist in addition to the listed elements / components / etc.; the terms "first", "second" and "third" etc. are used merely as labels and are not intended to limit the quantity of their objects.

[0038] Antennas are an important part of wireless communications, and their performance directly affects the quality and distance of communication. Traditional antenna materials mainly use metal materials such as copper and aluminum. With the continuous development of new fields such as new energy vehicles and drones, cost-effective and lightweight plastic metallized antennas are gradually being applied to vehicle antennas and drone antennas. Plastic metallized antennas require forming a metal coating on the surface of the plastic antenna substrate 1 to metallize the plastic metallized antenna.

[0039] At present, magnetron sputtering and metal coating are the mainstream solutions for metallization of the surface of the plastic antenna substrate 1. However, for the metal spraying method, a metal coating is deposited on the surface of the plastic antenna substrate 1 with a complex waveguide surface, and the metal coating has problems such as poor bonding and easy deformation of the substrate; and the coating structure prepared by the metal spraying method is loose and porous, which will cause the current density on the waveguide surface to decrease and thus affect the signal stability. As for the metal coating coating method, there are problems such as poor adhesion and uneven thickness of the metal coating, and the preparation process is complicated. The metal coating on the surface of the plastic antenna substrate 1 prepared by the above two preparation processes will have an adverse effect on the transmission of communication signals due to its uniformity and poor adhesion. In addition, in order to isolate oxygen, a dense oxide film will be formed on the surface of the metal coating, but the surface oxide will still cause the antenna standing wave coefficient to decrease, the power capacity to decrease, and affect the communication efficiency of the antenna.

[0040] Based on this, the embodiment of the present invention provides a metal composite coating 2 on the surface of a plastic metallized antenna. Figure 1 As shown, the metal composite coating 2 includes a metal base layer 21, a metal functional layer 22 and an inert metal protective layer 23. The metal base layer 21 is formed on the waveguide surface of the plastic antenna substrate 1 by evaporation or magnetron sputtering, and the material of the metal base layer 21 is at least one of stainless steel, NiCr alloy or NiAl alloy; the metal functional layer 22 is formed on the outer side of the metal base layer 21 by electroplating, and the material of the metal functional layer 22 is at least one of copper, nickel or aluminum; the inert metal protective layer 23 is formed on the outer side of the metal functional layer 22 by electroplating, and the material of the inert metal protective layer 23 is at least one of silver, platinum or gold.

[0041] The metal base layer 21 is deposited on the waveguide surface of the plastic antenna substrate 1 by evaporation. The bonding force of evaporation is high and the film-forming effect is good, which improves the bonding strength between the metal composite coating 2 and the plastic antenna substrate 1. The metal functional layer 22 is deposited on the side of the metal base layer 21 away from the waveguide surface by electroplating. Electroplating can improve the deposition efficiency, significantly improve its deposition rate and process uniformity, and effectively reduce the possibility of thermal deformation of the plastic antenna substrate 1. The metal composite coating 2 includes an inert metal protective layer 23. The material of the inert metal protective layer 23 is at least one of silver, platinum or gold. The inert metal protective layer 23 itself has high stability, can isolate oxygen, and has stable signal transmission efficiency. Therefore, the metal composite coating 2 has strong adhesion, good uniformity, and is not easy to oxidize.

[0042] The metal composite coating 2 on the surface of the plastic metallized antenna according to the embodiment of the present invention is described in detail below with reference to specific examples.

[0043] like Figure 1 As shown, the metal composite coating 2 on the surface of the plastic metallized antenna includes a metal base layer 21, a metal functional layer 22 and an inert metal protective layer 23. The metal base layer 21 is formed on the waveguide surface of the plastic antenna substrate 1 by evaporation. The bonding force of evaporation is high and the film-forming effect is good, which improves the bonding strength between the metal composite coating 2 and the plastic antenna. The metal functional layer 22 is formed on the outside of the metal base layer 21 by electroplating, which can improve the deposition efficiency of the metal functional layer 22, reduce the deposition time, and thus control the degree of thermal deformation of the plastic antenna substrate 1. The inert metal protective layer 23 is formed on the outside of the metal functional layer 22 by electroplating, which improves the anti-oxidation performance of the composite coating on the surface of the plastic antenna, ensures that the plastic antenna surface has excellent communication stability after metallization, and can ensure that the key index parameters such as the gain coefficient, standing wave coefficient and directivity of the plastic metallized antenna meet the standards.

[0044] The material of the plastic antenna substrate 1 is at least one of ABS plastic, PC-ABS plastic, LCP plastic, PAEK plastic or PPS plastic, the material of the metal base layer 21 is at least one of stainless steel, NiCr alloy or NiAl alloy, the material of the metal functional layer 22 is at least one of copper, nickel or aluminum, and the material of the inert metal protective layer 23 is at least one of silver, platinum or gold.

[0045] The thickness of the metal base layer 21 is 1 to 3 μm, the thickness of the metal functional layer 22 is 6 to 8 μm, the thickness of the inert metal protective layer 23 is 1 to 2 μm, and the thickness of the metal composite coating 2 is 9 to 12 μm. Figure 2 As shown, the overall conductivity of the plastic metallized antenna is controlled at 0.1-0.3Ω / cm. Figure 3As shown, the high frequency standing wave coefficient is between 1 and 1.2. The transmission signal of the plastic metallized antenna is accurately transmitted in azimuth and elevation directions.

[0046] ABS plastic (Acrylonitrile Butadiene Styrene plastic) is a terpolymer of acrylonitrile (A), butadiene (B) and styrene (S). PC / ABS is a thermoplastic plastic made of an alloy of polycarbonate (Polycarbonate) and polypropylene (ABS). LCP plastic is a liquid crystal polymer, PAEK plastic is polyaryletherketone, and PPS plastic is polyphenylene sulfide.

[0047] The embodiment of the present invention provides a method for preparing a metal composite coating 2 on the surface of a plastic metallized antenna. Figure 1 and Figure 4 As shown, the method may include:

[0048] Step S10 , depositing a metal base layer 21 on the waveguide surface of the plastic antenna substrate 1 by evaporation or magnetron sputtering.

[0049] Step S20: depositing a metal functional layer 22 on a side of the metal base layer 21 away from the waveguide surface by electroplating.

[0050] Step S30: depositing an inert metal protection layer 23 on a side of the metal functional layer 22 away from the waveguide surface by electroplating.

[0051] The method uses an evaporation method to deposit a metal base layer 21 on the waveguide surface of the plastic antenna substrate 1. The evaporation bonding force is high and the film-forming effect is good, which improves the bonding strength between the metal composite coating 2 and the plastic antenna substrate 1. The metal functional layer 22 is deposited on the metal base layer 21 by electroplating. Electroplating can improve the deposition efficiency, significantly improve its deposition rate and process uniformity, and effectively reduce the possibility of thermal deformation of the plastic antenna substrate 1. The inert metal protective layer 23 is formed on the metal functional layer 22 by electroplating, which can achieve precise control and rapid preparation of the inert metal protective layer 23, and the thickness error can be accurately controlled within 0.05μm. The inert metal protective layer 23 itself has high stability, can isolate oxygen, and has stable signal transmission efficiency. Therefore, the metal composite coating 2 has strong adhesion, good uniformity, and is not easy to oxidize.

[0052] Step S10 may also include pre-treatment of the waveguide surface of the plastic antenna substrate 1. The pre-treatment of the waveguide surface of the plastic antenna substrate 1 includes: cleaning the waveguide surface of the plastic antenna substrate 1 with a cleaning agent to remove surface oil and aging parts and eliminate surface static electricity.

[0053] In step S10, a metal base layer 21 is deposited on the waveguide surface of the plastic antenna substrate 1 by evaporation, comprising:

[0054] At least one of stainless steel, NiCr alloy or NiAl alloy is used as a raw material and placed in an evaporation boat or a crucible, and the evaporation boat and the pretreated waveguide surface are placed in a vacuum evaporation chamber to perform vacuum evaporation coating; wherein the conditions for vacuum evaporation are: vacuum degree <4×10-3pa, evaporation temperature is controlled at 70°C to 80°C, evaporation current is controlled at 50 to 150A, and evaporation time is 5 to 10min.

[0055] After the metal base layer 21 is evaporated, vacuum annealing is performed. The annealing temperature of the vacuum annealing is 70° C. to 80° C., and the annealing time is 30 min to 60 min. The vacuum annealing can significantly reduce the thermal deformation of the plastic antenna substrate 1 and the metal base layer 21 .

[0056] In step S10, a metal base layer is deposited on the waveguide surface of the plastic antenna substrate by magnetron sputtering, including:

[0057] The plastic antenna substrate is placed in a magnetron sputtering coating machine. Stainless steel, NiCr alloy, NiAl alloy or pure Cr targets are installed at the symmetrical target positions on both sides of the coating chamber. The vacuum of the coating chamber is evacuated to a vacuum degree of less than 5×10 -3 Pa, the deposition gas Ar is introduced, and the Ar flow rate is 20-40 SCCM;

[0058] The plastic antenna substrate is bombarded with high energy for 5-10 minutes to activate the surface of the plastic antenna substrate, so that metal ions penetrate into the surface of the plastic antenna substrate to form a metal penetration layer. The process parameters during high energy bombardment are: power supply power 60-100W, bias voltage 100-150V, constant temperature 25°C;

[0059] A metal base layer is deposited on the metal infiltration layer. The process parameters during deposition are: power supply 60-100W, bias voltage 20-50V, constant temperature 25°C, and deposition time 15-30min;

[0060] After the deposition is completed, vacuum annealing treatment is performed, the annealing temperature of the vacuum annealing treatment is 70° C. to 80° C., and the annealing time is 30 min to 60 min.

[0061] In step S20, a metal functional layer 22 is deposited on a side of the metal base layer 21 away from the waveguide surface by electroplating, comprising:

[0062] The plastic antenna substrate 1 with the metal primer layer 21 attached thereto after annealing is cleaned.

[0063] Copper sulfate, copper pyrophosphate, nickel sulfate or aluminum sulfate and other additive solutions are used as the first electroplating solution. After the plastic antenna substrate 1 with the metal base layer 21 attached is cleaned, it is placed in the first electroplating solution for electroplating for 20 to 30 minutes. The current density of the electroplating process is 5 to 15A / dm 2 .

[0064] After the electroplating of the metal functional layer 22 is completed, the plastic antenna substrate 1 with the metal functional layer 22 attached thereto is cleaned, passivated, and dried.

[0065] It should be noted that the components of the first electroplating solution include, by weight: 150-200 parts of copper sulfate, 150-200 parts of copper pyrophosphate, 150-200 parts of nickel sulfate or aluminum sulfate, 40-60 parts of sulfuric acid, and 0.06-0.8 parts of chloride ions.

[0066] By adjusting the process parameters such as the composition of the first electroplating solution, current density and electroplating time, the film thickness of the metal functional layer 22 reaches 6 to 8 μm. The actual working part of the plastic metallized antenna is only the surface layer. The thickness of this layer is called the skin depth. Under the corresponding working frequency, the thickness of the metal functional layer 22 meets 5 to 10 times the skin depth of the plastic metallized antenna, thereby achieving the signal performance index.

[0067] In step S30, an inert metal protective layer 23 is deposited on a side of the metal functional layer 22 away from the waveguide surface by electroplating, comprising:

[0068] The plastic antenna substrate 1 with the metal primer layer 21 and the metal functional layer 22 attached thereto is cleaned.

[0069] Silver methanesulfonate and other additives are used as the second electroplating solution, and the plastic antenna substrate 1 with the metal base layer 21 and the metal functional layer 22 is placed in the second electroplating solution for cyanide-free electroplating for 5 to 10 minutes. The current density of the electroplating treatment is 5 to 15 A / dm 2 .

[0070] After the electroplating of the inert metal protective layer 23 is completed, the plastic antenna substrate 1 attached with the metal base layer 21 , the metal functional layer 22 and the inert metal protective layer 23 is cleaned, passivated and dried.

[0071] It should be noted that the components of the second electroplating solution include, by weight, 150-200 parts of silver methanesulfonate, 150-200 parts of silver carbene sulfonate, 40-60 parts of citric acid, 20-30 parts of sodium dihydrogen phosphate, and 15-30 parts of aminotri(methylene)phosphonic acid.

[0072] In addition, in steps S30 and S40, the additive includes at least one of a metal brightener, a metal antioxidant, a fog suppressant, a plating layer refiner, a leveler, and a wetting agent.

[0073] The preparation method of the metal composite coating 2 on the surface of the plastic metallized antenna according to the present invention is described in detail below with reference to specific embodiments.

[0074] Example 1

[0075] A method for preparing a metal composite coating 2 on the surface of a plastic metallized antenna comprises the following steps:

[0076] The surface of the plastic antenna substrate 1 made of ABS material is cleaned with a cleaning agent to remove surface oil stains and aging parts and eliminate surface static electricity.

[0077] Stainless steel is used as a raw material and placed in an evaporation boat or a crucible. The evaporation boat and the plastic antenna substrate 1 are placed in a vacuum evaporation chamber for vacuum evaporation coating. When the vacuum degree of the vacuum evaporation chamber is less than 4×10 -3 Under the conditions of pa, the evaporation temperature is controlled to be 70°C, the evaporation current is controlled to be 50A, and the evaporation time is 5min; after the evaporation of the metal base layer 21 is completed, a vacuum annealing treatment is performed at 70°C to 80°C, and the annealing time is 30min to 60min.

[0078] The plastic antenna substrate 1 with the metal base layer 21 attached after annealing is cleaned; copper sulfate and other additive solutions are used as the first electroplating solution. After the plastic antenna substrate 1 with the metal base layer 21 is cleaned, it is placed in the first electroplating solution for electroplating for 20 minutes. The electroplating current density is 5A / dm 2 After the electroplating of the metal functional layer 22 is completed, the plastic antenna substrate 1 to which the metal functional layer 22 is attached is cleaned, passivated and dried.

[0079] The plastic antenna substrate 1 with the metal base layer 21 and the metal functional layer 22 attached thereto is cleaned; a solution of silver methanesulfonate and other additives is used as a second electroplating solution, and the plastic antenna substrate 1 with the metal base layer 21 and the metal functional layer 22 attached thereto is placed in the second electroplating solution for cyanide-free electroplating for 5 minutes, and the current density of the electroplating treatment is 5A / dm 2 After the electroplating of the inert metal protective layer 23 is completed, the plastic antenna substrate 1 to which the metal base layer 21, the metal functional layer 22 and the inert metal protective layer 23 are attached is cleaned, passivated and dried.

[0080] Example 2

[0081] A method for preparing a metal composite coating 2 on the surface of a plastic metallized antenna comprises the following steps:

[0082] The surface of the plastic antenna substrate 1 made of PC-ABS material is cleaned with a cleaning agent to remove surface oil stains and aging parts and eliminate surface static electricity.

[0083] NiAl alloy is placed in an evaporation boat or crucible as raw material, and the evaporation boat and the plastic antenna substrate 1 are placed in a vacuum evaporation chamber for vacuum evaporation coating. -3 Under the conditions of pa, the evaporation temperature is controlled to be 75°C, the evaporation current is controlled to be 60A, and the evaporation time is 7min; after the evaporation of the metal base layer 21 is completed, a vacuum annealing treatment is performed at 70°C to 80°C, and the annealing time is 30min to 60min.

[0084] The plastic antenna substrate 1 with the metal base layer 21 attached after annealing is cleaned; copper sulfate and other additive solutions are used as the first electroplating solution. After the plastic antenna substrate 1 with the metal base layer 21 is cleaned, it is placed in the first electroplating solution for electroplating for 25 minutes. The electroplating current density is 10A / dm 2 After the electroplating of the metal functional layer 22 is completed, the plastic antenna substrate 1 to which the metal functional layer 22 is attached is cleaned, passivated and dried.

[0085] The plastic antenna substrate 1 with the metal base layer 21 and the metal functional layer 22 attached thereto is cleaned; a solution of silver methanesulfonate and other additives is used as a second electroplating solution, and the plastic antenna substrate 1 with the metal base layer 21 and the metal functional layer 22 attached thereto is placed in the second electroplating solution for cyanide-free electroplating for 7 minutes, and the current density of the electroplating treatment is 7A / dm 2 After the electroplating of the inert metal protective layer 23 is completed, the plastic antenna substrate 1 to which the metal base layer 21, the metal functional layer 22 and the inert metal protective layer 23 are attached is cleaned, passivated and dried.

[0086] Example 3

[0087] A method for preparing a metal composite coating 2 on the surface of a plastic metallized antenna comprises the following steps:

[0088] The surface of the plastic antenna substrate 1 made of LCP material is cleaned with a cleaning agent to remove surface oil stains and aging parts and eliminate surface static electricity.

[0089] NiCr alloy is placed in an evaporation boat or crucible as a raw material, and the evaporation boat and the plastic antenna substrate 1 are placed in a vacuum evaporation chamber for vacuum evaporation coating. When the vacuum degree of the vacuum evaporation chamber is less than 4×10 -3 Under the conditions of pa, the evaporation temperature is controlled to be 78°C, the evaporation current is controlled to be 70A, and the evaporation time is 5min; after the evaporation of the metal base layer 21 is completed, a vacuum annealing treatment is performed at 70°C to 80°C, and the annealing time is 30min to 60min.

[0090] The plastic antenna substrate 1 with the metal base layer 21 attached after annealing is cleaned; copper sulfate and other additive solutions are used as the first electroplating solution. After the plastic antenna substrate 1 with the metal base layer 21 is cleaned, it is placed in the first electroplating solution for electroplating for 25 minutes. The electroplating current density is 15A / dm 2 After the electroplating of the metal functional layer 22 is completed, the plastic antenna substrate 1 to which the metal functional layer 22 is attached is cleaned, passivated and dried.

[0091] The plastic antenna substrate 1 with the metal base layer 21 and the metal functional layer 22 attached thereto is cleaned; a solution of silver methanesulfonate and other additives is used as a second electroplating solution, and the plastic antenna substrate 1 with the metal base layer 21 and the metal functional layer 22 attached thereto is placed in the second electroplating solution for cyanide-free electroplating for 10 minutes, and the current density of the electroplating treatment is 7A / dm 2 After the electroplating of the inert metal protective layer 23 is completed, the plastic antenna substrate 1 to which the metal base layer 21, the metal functional layer 22 and the inert metal protective layer 23 are attached is cleaned, passivated and dried.

[0092] Example 4

[0093] A method for preparing a metal composite coating 2 on the surface of a plastic metallized antenna comprises the following steps:

[0094] The surface of the plastic antenna substrate 1 made of PPS material is cleaned with a cleaning agent to remove surface oil stains and aging parts and eliminate surface static electricity.

[0095] NiCr alloy is placed in an evaporation boat or crucible as a raw material, and the evaporation boat and the plastic antenna substrate 1 are placed in a vacuum evaporation chamber for vacuum evaporation coating. When the vacuum degree of the vacuum evaporation chamber is less than 4×10 -3 Under the conditions of pa, the evaporation temperature is controlled to be 80°C, the evaporation current is controlled to be 100A, and the evaporation time is 10min; after the evaporation of the metal base layer 21 is completed, a vacuum annealing treatment is performed at 70°C to 80°C, and the annealing time is 30min to 60min.

[0096] The plastic antenna substrate 1 with the metal base layer 21 attached after annealing is cleaned; copper sulfate and other additive solutions are used as the first electroplating solution. After the plastic antenna substrate 1 with the metal base layer 21 is cleaned, it is placed in the first electroplating solution for electroplating for 30 minutes. The electroplating current density is 15A / dm 2 After the electroplating of the metal functional layer 22 is completed, the plastic antenna substrate 1 to which the metal functional layer 22 is attached is cleaned, passivated and dried.

[0097] The plastic antenna substrate 1 with the metal base layer 21 and the metal functional layer 22 attached thereto is cleaned; a solution of silver methanesulfonate and other additives is used as an electroplating solution, and the plastic antenna substrate 1 with the metal base layer 21 and the metal functional layer 22 attached thereto is placed in a second electroplating solution for cyanide-free electroplating for 10 minutes, and the current density of the electroplating treatment is 15A / dm 2 After the electroplating of the inert metal protective layer 23 is completed, the plastic antenna substrate 1 to which the metal base layer 21, the metal functional layer 22 and the inert metal protective layer 23 are attached is cleaned, passivated and dried.

[0098] Example 5

[0099] A method for preparing a metal composite coating 2 on the surface of a plastic metallized antenna comprises the following steps:

[0100] The surface of the plastic antenna substrate 1 made of LCP material is cleaned with a cleaning agent to remove surface oil stains and aging parts and eliminate surface static electricity.

[0101] Stainless steel is used as a raw material and placed in an evaporation boat or a crucible. The evaporation boat and the plastic antenna substrate 1 are placed in a vacuum evaporation chamber for vacuum evaporation coating. When the vacuum degree of the vacuum evaporation chamber is less than 4×10 -3 Under the conditions of pa, the evaporation temperature is controlled to be 75°C, the evaporation current is controlled to be 120A, and the evaporation time is 10min; after the evaporation of the metal base layer 21 is completed, a vacuum annealing treatment is performed at 70°C to 80°C, and the annealing time is 30min to 60min.

[0102] The plastic antenna substrate 1 with the metal base layer 21 attached after annealing is cleaned; copper sulfate and other additive solutions are used as the first electroplating solution. After the plastic antenna substrate 1 with the metal base layer 21 is cleaned, it is placed in the first electroplating solution for electroplating for 30 minutes. The electroplating current density is 10A / dm 2 After the electroplating of the metal functional layer 22 is completed, the plastic antenna substrate 1 to which the metal functional layer 22 is attached is cleaned, passivated and dried.

[0103] The plastic antenna substrate 1 with the metal base layer 21 and the metal functional layer 22 attached thereto is cleaned; a solution of silver methanesulfonate and other additives is used as a second electroplating solution, and the plastic antenna substrate 1 with the metal base layer 21 and the metal functional layer 22 attached thereto is placed in the second electroplating solution for cyanide-free electroplating for 8 minutes, and the current density of the electroplating treatment is 7A / dm 2 After the electroplating of the inert metal protective layer 23 is completed, the plastic antenna substrate 1 to which the metal base layer 21, the metal functional layer 22 and the inert metal protective layer 23 are attached is cleaned, passivated and dried.

[0104] Example 6

[0105] A method for preparing a metal composite coating 2 on the surface of a plastic metallized antenna comprises the following steps:

[0106] The surface of the plastic antenna substrate 1 made of PPS material is cleaned with a cleaning agent to remove surface oil stains and aging parts and eliminate surface static electricity.

[0107] Stainless steel is used as a raw material and placed in an evaporation boat or a crucible. The evaporation boat and the plastic antenna substrate 1 are placed in a vacuum evaporation chamber for vacuum evaporation coating. When the vacuum degree of the vacuum evaporation chamber is less than 4×10 -3 Under the conditions of pa, the evaporation temperature is controlled to be 75°C, the evaporation current is controlled to be 60A, and the evaporation time is 6min; after the evaporation of the metal base layer 21 is completed, a vacuum annealing treatment is performed at 70°C~80°C, and the annealing time is 30min~60min.

[0108] The plastic antenna substrate 1 with the metal base layer 21 attached after annealing is cleaned; aluminum sulfate and other additive solutions are used as the first electroplating solution, and after the plastic antenna substrate 1 with the metal base layer 21 is cleaned, it is placed in the first electroplating solution for electroplating for 30 minutes, and the electroplating current density is 10A / dm 2 After the electroplating of the metal functional layer 22 is completed, the plastic antenna substrate 1 to which the metal functional layer 22 is attached is cleaned, passivated and dried.

[0109] The plastic antenna substrate 1 with the metal base layer 21 and the metal functional layer 22 attached thereto is cleaned; a solution of silver methanesulfonate and other additives is used as a second electroplating solution, and the plastic antenna substrate 1 with the metal base layer 21 and the metal functional layer 22 attached thereto is placed in the second electroplating solution for cyanide-free electroplating for 5 minutes, and the current density of the electroplating treatment is 7A / dm 2 After the electroplating of the inert metal protective layer 23 is completed, the plastic antenna substrate 1 to which the metal base layer 21, the metal functional layer 22 and the inert metal protective layer 23 are attached is cleaned, passivated and dried.

[0110] Example 7

[0111] A method for preparing a metal composite coating 2 on the surface of a plastic metallized antenna comprises the following steps:

[0112] The surface of the plastic antenna substrate 1 made of PPS material is cleaned with a cleaning agent to remove surface oil stains and aging parts and eliminate surface static electricity.

[0113] NiCr alloy is placed in an evaporation boat or crucible as a raw material, and the evaporation boat and the plastic antenna substrate 1 are placed in a vacuum evaporation chamber for vacuum evaporation coating. -3Under the conditions of pa, the evaporation temperature is controlled to be 75°C, the evaporation current is controlled to be 60A, and the evaporation time is 6min; after the evaporation of the metal base layer 21 is completed, a vacuum annealing treatment is performed at 70°C~80°C, and the annealing time is 30min~60min.

[0114] The plastic antenna substrate 1 with the metal base layer 21 attached after annealing is cleaned; aluminum sulfate and other additive solutions are used as the first electroplating solution, and after the plastic antenna substrate 1 with the metal base layer 21 is cleaned, it is placed in the first electroplating solution for electroplating for 30 minutes, and the electroplating current density is 10A / dm 2 After the electroplating of the metal functional layer 22 is completed, the plastic antenna substrate 1 to which the metal functional layer 22 is attached is cleaned, passivated and dried.

[0115] The plastic antenna substrate 1 with the metal base layer 21 and the metal functional layer 22 attached thereto is cleaned; a solution of silver methanesulfonate and other additives is used as a second electroplating solution, and the plastic antenna substrate 1 with the metal base layer 21 and the metal functional layer 22 attached thereto is placed in the second electroplating solution for cyanide-free electroplating for 10 minutes, and the current density of the electroplating treatment is 7A / dm 2 After the electroplating of the inert metal protective layer 23 is completed, the plastic antenna substrate 1 to which the metal base layer 21, the metal functional layer 22 and the inert metal protective layer 23 are attached is cleaned, passivated and dried.

[0116] Example 8

[0117] A method for preparing a metal composite coating 2 on the surface of a plastic metallized antenna comprises the following steps:

[0118] The surface of the plastic antenna substrate 1 made of PPS material is cleaned with a cleaning agent to remove surface oil stains and aging parts and eliminate surface static electricity.

[0119] NiAl alloy is placed in an evaporation boat or crucible as raw material, and the evaporation boat and the plastic antenna substrate 1 are placed in a vacuum evaporation chamber for vacuum evaporation coating. -3 Under the conditions of pa, the evaporation temperature is controlled to be 75°C, the evaporation current is controlled to be 150A, and the evaporation time is 10min; after the evaporation of the metal base layer 21 is completed, a vacuum annealing treatment is performed at 70°C to 80°C, and the annealing time is 30min to 60min.

[0120] The plastic antenna substrate 1 with the metal base layer 21 attached after annealing is cleaned; aluminum sulfate and other additive solutions are used as the first electroplating solution, and after the plastic antenna substrate 1 with the metal base layer 21 is cleaned, it is placed in the first electroplating solution for electroplating for 30 minutes, and the electroplating current density is 10A / dm 2After the electroplating of the metal functional layer 22 is completed, the plastic antenna substrate 1 to which the metal functional layer 22 is attached is cleaned, passivated and dried.

[0121] The plastic antenna substrate 1 with the metal base layer 21 and the metal functional layer 22 attached thereto is cleaned; a solution of silver methanesulfonate and other additives is used as a second electroplating solution, and the plastic antenna substrate 1 with the metal base layer 21 and the metal functional layer 22 attached thereto is placed in the second electroplating solution for cyanide-free electroplating for 8 minutes, and the current density of the electroplating treatment is 7A / dm 2 After the electroplating of the inert metal protective layer 23 is completed, the plastic antenna substrate 1 to which the metal base layer 21, the metal functional layer 22 and the inert metal protective layer 23 are attached is cleaned, passivated and dried.

[0122] Example 9

[0123] A method for preparing a metal composite coating 2 on the surface of a plastic metallized antenna comprises the following steps:

[0124] The surface of the plastic antenna substrate 1 made of PAEK material is cleaned with a cleaning agent to remove surface oil stains and aging parts and eliminate surface static electricity.

[0125] NiAl alloy is placed in an evaporation boat or crucible as raw material, and the evaporation boat and the plastic antenna substrate 1 are placed in a vacuum evaporation chamber for vacuum evaporation coating. -3 Under the conditions of pa, the evaporation temperature is controlled to be 75°C, the evaporation current is controlled to be 150A, and the evaporation time is 10min; after the evaporation of the metal base layer 21 is completed, a vacuum annealing treatment is performed at 70°C to 80°C, and the annealing time is 30min to 60min.

[0126] The plastic antenna substrate 1 with the metal base layer 21 attached after annealing is cleaned; copper pyrophosphate and other additive solutions are used as the first electroplating solution, and after the plastic antenna substrate 1 with the metal base layer 21 is cleaned, it is placed in the first electroplating solution for electroplating for 20 minutes, and the electroplating current density is 10A / dm 2 After the electroplating of the metal functional layer 22 is completed, the plastic antenna substrate 1 to which the metal functional layer 22 is attached is cleaned, passivated and dried.

[0127] The plastic antenna substrate 1 with the metal base layer 21 and the metal functional layer 22 attached thereto is cleaned; a solution of silver methanesulfonate and other additives is used as a second electroplating solution, and the plastic antenna substrate 1 with the metal base layer 21 and the metal functional layer 22 attached thereto is placed in the second electroplating solution for cyanide-free electroplating for 9 minutes, and the current density of the electroplating treatment is 7A / dm 2After the electroplating of the inert metal protective layer 23 is completed, the plastic antenna substrate 1 to which the metal base layer 21, the metal functional layer 22 and the inert metal protective layer 23 are attached is cleaned, passivated and dried.

[0128] Example 10

[0129] A method for preparing a metal composite coating 2 on the surface of a plastic metallized antenna comprises the following steps:

[0130] The surface of the plastic antenna substrate 1 made of PAEK material is cleaned with a cleaning agent to remove surface oil stains and aging parts and eliminate surface static electricity.

[0131] NiAl alloy is placed in an evaporation boat or crucible as raw material, and the evaporation boat and the plastic antenna substrate 1 are placed in a vacuum evaporation chamber for vacuum evaporation coating. -3 Under the conditions of pa, the evaporation temperature is controlled to be 75°C, the evaporation current is controlled to be 150A, and the evaporation time is 10min; after the evaporation of the metal base layer 21 is completed, a vacuum annealing treatment is performed at 70°C to 80°C, and the annealing time is 30min to 60min.

[0132] The plastic antenna substrate 1 with the metal base layer 21 attached after annealing is cleaned; nickel sulfate and other additive solutions are used as the first electroplating solution. After the plastic antenna substrate 1 with the metal base layer 21 is cleaned, it is placed in the first electroplating solution for electroplating for 30 minutes, and the electroplating current density is 10A / dm 2 After the electroplating of the metal functional layer 22 is completed, the plastic antenna substrate 1 to which the metal functional layer 22 is attached is cleaned, passivated and dried.

[0133] The plastic antenna substrate 1 with the metal base layer 21 and the metal functional layer 22 attached thereto is cleaned; a solution of silver methanesulfonate and other additives is used as a second electroplating solution, and the plastic antenna substrate 1 with the metal base layer 21 and the metal functional layer 22 attached thereto is placed in the second electroplating solution for cyanide-free electroplating for 7 minutes, and the current density of the electroplating treatment is 7A / dm 2 After the electroplating of the inert metal protective layer 23 is completed, the plastic antenna substrate 1 to which the metal base layer 21, the metal functional layer 22 and the inert metal protective layer 23 are attached is cleaned, passivated and dried.

[0134] Embodiment 11

[0135] A method for preparing a metal composite coating 2 on the surface of a plastic metallized antenna comprises the following steps:

[0136] The surface of the plastic antenna substrate 1 made of PAEK material is cleaned with a cleaning agent to remove surface oil stains and aging parts and eliminate surface static electricity.

[0137] The PAEK plastic antenna substrate 1 is placed in a magnetron sputtering coating machine, and NiCr alloy targets are installed at the symmetrical target positions on both sides of the coating chamber. The vacuum degree of the coating chamber is reduced to less than 5×10 -3 Pa, and Ar deposition gas is introduced, and the Ar flow rate is 20SCCM. The plastic antenna substrate 1 is subjected to high-energy bombardment for 10 minutes. The process parameters during high-energy bombardment are: power supply power of 80W, bias voltage of 120V, constant temperature of 25°C. The surface of the plastic antenna substrate 1 is bombarded with high-bias high-energy particles, which can activate the surface of the plastic antenna substrate 1, so that metal ions penetrate into the surface of the plastic antenna substrate 1 to form a metal penetration layer, thereby improving the bonding strength between the metal base layer 21 and the surface of the plastic antenna substrate 1. The metal base layer 21 is deposited on the metal penetration layer. The process parameters during deposition are: power supply power of 80W, bias voltage of 35V, constant temperature of 25°C, and deposition time of 20 minutes. After the metal base layer 21 is deposited, it is subjected to vacuum annealing at 70°C to 80°C, and the annealing time is 30min to 60min.

[0138] The plastic antenna substrate 1 with the metal base layer 21 attached after annealing is cleaned; nickel sulfate and other additive solutions are used as the first electroplating solution. After the plastic antenna substrate 1 with the metal base layer 21 is cleaned, it is placed in the first electroplating solution for electroplating for 30 minutes, and the electroplating current density is 10A / dm 2 After the electroplating of the metal functional layer 22 is completed, the plastic antenna substrate 1 to which the metal functional layer 22 is attached is cleaned, passivated and dried.

[0139] The plastic antenna substrate 1 with the metal base layer 21 and the metal functional layer 22 attached thereto is cleaned; a solution of silver methanesulfonate and other additives is used as a second electroplating solution, and the plastic antenna substrate 1 with the metal base layer 21 and the metal functional layer 22 attached thereto is placed in the second electroplating solution for cyanide-free electroplating for 7 minutes, and the current density of the electroplating treatment is 7A / dm 2 After the electroplating of the inert metal protective layer 23 is completed, the plastic antenna substrate 1 to which the metal base layer 21, the metal functional layer 22 and the inert metal protective layer 23 are attached is cleaned, passivated and dried.

[0140] Example 12

[0141] A method for preparing a metal composite coating 2 on the surface of a plastic metallized antenna comprises the following steps:

[0142] The surface of the plastic antenna substrate 1 made of PAEK material is cleaned with a cleaning agent to remove surface oil stains and aging parts and eliminate surface static electricity.

[0143] The PAEK plastic antenna substrate 1 is placed in a magnetron sputtering coating machine, and NiAl alloy targets are installed at the symmetrical target positions on both sides of the coating chamber. The vacuum degree of the coating chamber is reduced to less than 5×10 -3 Pa, and Ar is introduced as deposition gas, with an Ar flow rate of 40 SCCM. The plastic antenna substrate 1 is subjected to high-energy bombardment for 10 minutes, and the process parameters during high-energy bombardment are: power supply power of 60W, bias voltage of 150V, constant temperature of 25°C. The surface of the plastic antenna substrate 1 is bombarded with high-bias high-energy particles, which can activate the surface of the plastic antenna substrate 1, so that metal ions penetrate into the surface of the plastic antenna substrate 1 to form a metal penetration layer, thereby improving the bonding strength between the metal base layer 21 and the surface of the plastic antenna substrate 1. The metal base layer 21 is deposited on the metal penetration layer, and the process parameters during deposition are: power supply power of 60W, bias voltage of 50V, constant temperature of 25°C, and deposition time of 30 minutes; after the metal base layer 21 is deposited, it is subjected to vacuum annealing at 70°C to 80°C, and the annealing time is 30 minutes to 60 minutes.

[0144] The plastic antenna substrate 1 with the metal base layer 21 attached after annealing is cleaned; nickel sulfate and other additive solutions are used as the first electroplating solution. After the plastic antenna substrate 1 with the metal base layer 21 is cleaned, it is placed in the first electroplating solution for electroplating for 30 minutes, and the electroplating current density is 10A / dm 2 After the electroplating of the metal functional layer 22 is completed, the plastic antenna substrate 1 to which the metal functional layer 22 is attached is cleaned, passivated and dried.

[0145] The plastic antenna substrate 1 with the metal base layer 21 and the metal functional layer 22 attached thereto is cleaned; a solution of silver methanesulfonate and other additives is used as a second electroplating solution, and the plastic antenna substrate 1 with the metal base layer 21 and the metal functional layer 22 attached thereto is placed in the second electroplating solution for cyanide-free electroplating for 7 minutes, and the current density of the electroplating treatment is 7A / dm 2 After the electroplating of the inert metal protective layer 23 is completed, the plastic antenna substrate 1 to which the metal base layer 21, the metal functional layer 22 and the inert metal protective layer 23 are attached is cleaned, passivated and dried.

[0146] Example 13

[0147] A method for preparing a metal composite coating 2 on the surface of a plastic metallized antenna comprises the following steps:

[0148] The surface of the plastic antenna substrate 1 made of PAEK material is cleaned with a cleaning agent to remove surface oil stains and aging parts and eliminate surface static electricity.

[0149] The PAEK plastic antenna substrate 1 is placed in a magnetron sputtering coating machine, stainless steel targets are installed at the symmetrical target positions on both sides of the coating chamber, and the vacuum of the coating chamber is evacuated to a vacuum degree of less than 5×10 -3 Pa, and Ar deposition gas is introduced, and the Ar flow rate is 30SCCM. The plastic antenna substrate 1 is subjected to high-energy bombardment for 5 minutes. The process parameters during high-energy bombardment are: power supply power of 100W, bias voltage of 100V, constant temperature of 25°C. The surface of the plastic antenna substrate 1 is bombarded with high-bias high-energy particles, which can activate the surface of the plastic antenna substrate 1, so that metal ions penetrate into the surface of the plastic antenna substrate 1 to form a metal penetration layer, thereby improving the bonding strength between the metal base layer 21 and the surface of the plastic antenna substrate 1. The metal base layer 21 is deposited on the metal penetration layer. The process parameters during deposition are: power supply power of 100W, bias voltage of 20V, constant temperature of 25°C, and deposition time of 15 minutes; after the metal base layer 21 is deposited, it is subjected to vacuum annealing at 70°C to 80°C, and the annealing time is 30 minutes to 60 minutes.

[0150] The plastic antenna substrate 1 with the metal base layer 21 attached after annealing is cleaned; nickel sulfate and other additive solutions are used as the first electroplating solution. After the plastic antenna substrate 1 with the metal base layer 21 is cleaned, it is placed in the first electroplating solution for electroplating for 30 minutes, and the electroplating current density is 10A / dm 2 After the electroplating of the metal functional layer 22 is completed, the plastic antenna substrate 1 to which the metal functional layer 22 is attached is cleaned, passivated and dried.

[0151] The plastic antenna substrate 1 with the metal base layer 21 and the metal functional layer 22 attached thereto is cleaned; a solution of silver methanesulfonate and other additives is used as a second electroplating solution, and the plastic antenna substrate 1 with the metal base layer 21 and the metal functional layer 22 attached thereto is placed in the second electroplating solution for cyanide-free electroplating for 7 minutes, and the current density of the electroplating treatment is 7A / dm 2 After the electroplating of the inert metal protective layer 23 is completed, the plastic antenna substrate 1 to which the metal base layer 21, the metal functional layer 22 and the inert metal protective layer 23 are attached is cleaned, passivated and dried.

[0152] Embodiment 14

[0153] A method for preparing a metal composite coating 2 on the surface of a plastic metallized antenna comprises the following steps:

[0154] The surface of the plastic antenna substrate 1 made of PAEK material is cleaned with a cleaning agent to remove surface oil stains and aging parts and eliminate surface static electricity.

[0155] The PAEK plastic antenna substrate 1 is placed in a magnetron sputtering coating machine, and pure Cr targets are installed at the symmetrical target positions on both sides of the coating chamber. The vacuum is evacuated to a vacuum degree of less than 5×10 -3 Pa, and Ar deposition gas is introduced, and the Ar flow rate is 30SCCM. The plastic antenna substrate 1 is subjected to high-energy bombardment for 8 minutes. The process parameters during high-energy bombardment are: power supply power of 80W, bias voltage of 100V, constant temperature of 25°C. The surface of the plastic antenna substrate 1 is bombarded with high-bias high-energy particles, which can activate the surface of the plastic antenna substrate 1, so that metal ions penetrate into the surface of the plastic antenna substrate 1 to form a metal penetration layer, thereby improving the bonding strength between the metal base layer 21 and the surface of the plastic antenna substrate 1. The metal base layer 21 is deposited on the metal penetration layer. The process parameters during deposition are: power supply power of 100W, bias voltage of 35V, constant temperature of 25°C, and deposition time of 25 minutes. After the metal base layer 21 is deposited, it is subjected to vacuum annealing at 70°C to 80°C, and the annealing time is 30 minutes to 60 minutes.

[0156] The plastic antenna substrate 1 with the metal base layer 21 attached after annealing is cleaned; nickel sulfate and other additive solutions are used as the first electroplating solution. After the plastic antenna substrate 1 with the metal base layer 21 is cleaned, it is placed in the first electroplating solution for electroplating for 30 minutes, and the electroplating current density is 10A / dm 2 After the electroplating of the metal functional layer 22 is completed, the plastic antenna substrate 1 to which the metal functional layer 22 is attached is cleaned, passivated and dried.

[0157] The plastic antenna substrate 1 with the metal base layer 21 and the metal functional layer 22 attached thereto is cleaned; a solution of silver methanesulfonate and other additives is used as a second electroplating solution, and the plastic antenna substrate 1 with the metal base layer 21 and the metal functional layer 22 attached thereto is placed in the second electroplating solution for cyanide-free electroplating for 7 minutes, and the current density of the electroplating treatment is 7A / dm 2 After the electroplating of the inert metal protective layer 23 is completed, the plastic antenna substrate 1 to which the metal base layer 21, the metal functional layer 22 and the inert metal protective layer 23 are attached is cleaned, passivated and dried.

[0158] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the disclosure of the invention herein. This application is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present invention are indicated by the appended claims.

Claims

1. A metal composite coating on the surface of a plastic metallized antenna, characterized in that: include: A metal base layer is formed on the waveguide surface of the plastic antenna substrate by evaporation or magnetron sputtering, wherein the material of the metal base layer is at least one of stainless steel, NiCr alloy or NiAl alloy; A metal functional layer is formed on the outer side of the metal base layer by electroplating, and the material of the metal functional layer is at least one of copper, nickel or aluminum; The inert metal protective layer is formed on the outer side of the metal functional layer by electroplating, and the material of the inert metal protective layer is at least one of silver, platinum or gold.

2. The metal composite coating on the surface of the plastic metallized antenna according to claim 1, characterized in that: The thickness of the metal base layer is 1-3 μm, the thickness of the metal functional layer is 6-8 μm, the thickness of the inert metal protective layer is 1-2 μm, and the thickness of the metal composite coating is 9-12 μm.

3. A method for preparing a metal composite coating on the surface of a plastic metallized antenna according to claim 1 or 2, characterized in that: The method comprises: A metal base layer is deposited on the waveguide surface of the plastic antenna substrate by evaporation or magnetron sputtering; Depositing a metal functional layer on a side of the metal base layer away from the waveguide surface by electroplating; An inert metal protection layer is deposited on a side of the metal functional layer away from the waveguide surface by electroplating.

4. The method for preparing the metal composite coating on the surface of the plastic metallized antenna according to claim 3, characterized in that: The metal base layer is deposited on the waveguide surface of the plastic antenna substrate by evaporation method, including: Using at least one of stainless steel, NiCr alloy or NiAl alloy as raw material, the plastic antenna substrate is placed in a vacuum evaporation chamber for vacuum evaporation, wherein the vacuum evaporation condition is: vacuum degree <4×10 -3 pa, control the evaporation temperature to 70℃~80℃, control the evaporation current to 50~150A, and the evaporation time to 5~10min; After the evaporation is completed, a vacuum annealing treatment is performed, wherein the annealing temperature of the vacuum annealing treatment is 70° C. to 80° C., and the annealing time is 30 min to 60 min.

5. The method for preparing the metal composite coating on the surface of the plastic metallized antenna according to claim 3, characterized in that: The metal base layer is deposited on the waveguide surface of the plastic antenna substrate by a magnetron sputtering method, comprising: The plastic antenna substrate is placed in a magnetron sputtering coating machine, and stainless steel, NiCr alloy, NiAl alloy or pure Cr targets are installed at the symmetrical target positions on both sides of the coating chamber. The vacuum degree of the coating chamber is evacuated to less than 5×10 -3 Pa, the deposition gas Ar is introduced, and the Ar flow rate is 20-40 SCCM; The plastic antenna substrate is subjected to high-energy bombardment for 5-10 minutes to activate the surface of the plastic antenna substrate, so that metal ions penetrate into the surface of the plastic antenna substrate to form a metal penetration layer. The process parameters during high-energy bombardment are: power supply power 60-100W, bias voltage 100-150V, constant temperature 25°C; Depositing a metal primer layer on the metal infiltration layer, wherein the process parameters during deposition are: power supply 60-100W, bias voltage 20-50V, constant temperature 25°C, and deposition time 15-30min; After the deposition is completed, a vacuum annealing treatment is performed, wherein the annealing temperature of the vacuum annealing treatment is 70° C. to 80° C., and the annealing time is 30 min to 60 min.

6. The method for preparing the metal composite coating on the surface of the plastic metallized antenna according to claim 3, characterized in that: Depositing a metal functional layer on a side of the metal base layer away from the waveguide surface by electroplating, comprising: Copper sulfate, copper pyrophosphate, nickel sulfate or aluminum sulfate and other additive solutions are used as the first electroplating solution, and the plastic antenna substrate with the metal base layer is placed in the first electroplating solution for electroplating for 20 to 30 minutes. The current density of the electroplating process is 5 to 15 A / dm 2 .

7. The method for preparing the metal composite coating on the surface of the plastic metallized antenna according to claim 3, characterized in that: Depositing an inert metal protective layer on a side of the metal functional layer away from the waveguide surface by electroplating, comprising: Silver methanesulfonate and other additives are used as the second electroplating solution, and the plastic antenna substrate with the metal base layer and the metal functional layer is placed in the second electroplating solution for cyanide-free electroplating for 5 to 10 minutes. The current density of the electroplating treatment is 5 to 15 A / dm 2 .

8. The method for preparing the metal composite coating on the surface of the plastic metallized antenna according to claim 6, characterized in that: The components of the first electroplating solution include, by weight, 150-200 parts of copper sulfate, 150-200 parts of copper pyrophosphate, 150-200 parts of nickel sulfate or aluminum sulfate, 40-60 parts of sulfuric acid, and 0.06-0.8 parts of chloride ions.

9. The method for preparing the metal composite coating on the surface of the plastic metallized antenna according to claim 7, characterized in that: The components of the second electroplating solution include, by weight, 150-200 parts of silver methanesulfonate, 150-200 parts of silver carbene sulfonate, 40-60 parts of citric acid, 20-30 parts of sodium dihydrogen phosphate, and 15-30 parts of aminotri(methylene)phosphonic acid.

10. The method for preparing the metal composite coating on the surface of the plastic metallized antenna according to claim 6 or 7, characterized in that: The additive comprises at least one of a metal brightener, a metal antioxidant, a fog suppressant, a plating layer refiner, a leveler and a wetting agent.

Images