CN111041525B - Method for enhancing surface of microwave communication device by electroplating Ni-WC composite layer through low-temperature molten salt - Google Patents
Method for enhancing surface of microwave communication device by electroplating Ni-WC composite layer through low-temperature molten salt Download PDFInfo
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- CN111041525B CN111041525B CN201911416456.5A CN201911416456A CN111041525B CN 111041525 B CN111041525 B CN 111041525B CN 201911416456 A CN201911416456 A CN 201911416456A CN 111041525 B CN111041525 B CN 111041525B
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/66—Electroplating: Baths therefor from melts
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/18—Electroplating using modulated, pulsed or reversing current
Abstract
The invention belongs to the field of microwave communication devices, and discloses a method for enhancing the surface of a microwave communication device by electroplating a Ni-WC composite layer through low-temperature molten salt, which comprises the following steps: 1) the inorganic salt LiNO3、NaNO3、KNO3、Ca(NO3)2、NaNO2、KNO2、LiCl、NaCl、KCl、CaCl2Oven drying, grinding to obtain mixed salt, heating at 100 deg.C to melt into liquid, and heating in electroplating bath to keep liquid state. The melting point of the composite electroplating solution prepared by the invention is 60 ℃, the electroplating temperature is actually selected to be 100 ℃ for higher fluidity of the electrolyte, compared with the traditional molten salt electroplating at the temperature of 150-.
Description
Technical Field
The invention relates to the technical field of microwave communication devices, in particular to a method for reinforcing the surface of a microwave communication device by electroplating a Ni-WC composite layer through low-temperature molten salt.
Background
At present, microwave communication connecting devices and corresponding cable joints are made of metal, and in order to ensure good electrical and physical properties of the microwave communication connecting devices and the corresponding cable joints, the surfaces of the connectors and the cable joints need to have the characteristics of wear resistance, high hardness, self lubrication, acid and alkali corrosion resistance, high conductivity and the like. In order to improve the performance of the above products, electroplating methods can be generally adopted to deposit a wear-resistant and corrosion-resistant metal coating on the surfaces of the products, such as: the metal is simple substance nickel Ni or simple substance gold Au, however, the cost of nickel Ni and gold Au is high, and the hardness of nickel Ni and gold Au needs to be improved. Tungsten carbide WC belongs to hexagonal crystals, has metallic luster, hardness close to that of diamond, excellent electric and heat conducting performance, good chemical stability, acid and alkali corrosion resistance, and can be electroplated to prepare an excellent novel plating layer. Therefore, if micro-nano tungsten carbide WC particles can be added into the electroplating solution, under proper electroplating conditions, the metal nickel and the tungsten carbide WC are simultaneously electroformed and precipitated to be attached to the surface of a metal part, so that a novel composite coating with excellent performance is obtained.
The traditional chemical plating method takes an electrolyte aqueous solution as an electrolyte, often contains extremely toxic cyanide to harm human bodies and ecological environment, not only generates a large amount of toxic and harmful electroplating wastewater, but also often reduces the hardness and the smoothness of a plated film because hydrogen embrittlement is generated on a metal plating layer along with electrolysis side reaction;
the molten salt electroplating method is generally carried out at a higher temperature, the process of electroplating to generate a product actually comprises the processes of depositing new metal and mutual solid diffusion with base metal, the mutual diffusion and permeation enable the combination between a new metal deposition layer and the base metal to be firmer and tighter, and the obtained coating is denser, smoother and more wear-resistant, however, the temperature of common molten salt electroplating is higher and reaches 150-.
Disclosure of Invention
Technical problem to be solved
1. Technical problem to be solved
Aiming at the problems in the prior art, the invention aims to provide a method for strengthening the surface of a microwave communication device by electroplating a Ni-WC composite layer through low-temperature molten salt, solves the problems of easy pollution generation, high electrolysis temperature, large energy waste and inconvenient operation in the electrolysis process in the prior art, and simultaneously improves the hardness and the corrosion resistance of the surface of the conventional microwave device.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme:
a method for plating a Ni-WC composite layer on the surface of a microwave communication device by low-temperature molten salt comprises the following steps:
1) the inorganic salt LiNO3、NaNO3、KNO3、Ca(NO3)2、NaNO2、KNO2、LiCl、NaCl、 KCl、CaCl2Drying, grinding to obtain mixed salt, heating at 100 deg.C to melt into liquid, and heating in electroplating bath to maintain the liquid state;
2) continuously adding one or a mixture of more of nickel chloride, nickel nitrate, nickel sulfate and micro-nano tungsten carbide in the molten salt electroplating bath, and adding a proper amount of sodium hydrogen phosphate and boric acid to form a composite electroplating solution;
3) ultrasonic cleaning in 0.5mol/L dilute nitric acid and 0.5mol/L dilute NaOH solution for 2min, ultrasonic cleaning in distilled water for 5min, and air drying;
4) the electrolytic bath, the cathode and the anode are assembled and electroplated under the action of an external voltage-stabilizing direct-current power supply, so that the Ni-WC composite coating can be obtained on the surface of the cathode (microwave connector).
Preferably, the LiNO is3、NaNO3、KNO3、Ca(NO3)2、NaNO2、KNO2、LiCl、NaCl、 KCl、CaCl2The weight percentage ratio of (A) is 15%: 8%: 10%: 5%: 10%: 30%: 2%: 5%: 5%: 10 percent.
Preferably, the weight percentage of the nickel chloride is 0.5% -2%, the weight percentage of the nickel nitrate is 0.5% -2%, the weight percentage of the nickel sulfate is 0.5% -2%, and the weight percentage of the micro-nano tungsten carbide is 1% -3%.
Preferably, the weight percentages of the sodium hydrogen phosphate and the boric acid are respectively 0.5% -1% and 0.5% -1.5%.
Preferably, the electroplating under the external voltage-stabilized direct-current power supply specifically comprises the following steps:
firstly, the cell voltage is controlled to be 2V-4V, and the current density is controlled to be 20-50mA/cm2Pre-electroplating for 0.5-1h, and increasing current density to 60-200mA/cm2And (3) carrying out normal electroplating, controlling the electroplating time to obtain Ni-WC composite coatings with different thicknesses of 10-300 micrometers on the surface of a cathode (microwave connector), ultrasonically cleaning the obtained composite coatings in distilled water for 5min, and airing.
(III) advantageous effects
Compared with the prior art, the invention provides a method for plating a Ni-WC composite layer on the surface of a microwave communication device by low-temperature molten salt, which has the following beneficial effects:
(1) the melting point of the composite electroplating solution prepared by the invention is 60 ℃, the electroplating temperature is actually selected to be 100 ℃ for higher fluidity of the electrolyte, and compared with the traditional molten salt electroplating at the temperature of 150-.
(2) The Ni-WC composite coating obtained by electroplating has the advantages of wear resistance, high hardness, self lubrication, acid and alkali corrosion resistance, high electric and heat conductivity coefficient and the like, so that the composite coating with wear resistance, high hardness, self lubrication, acid and alkali corrosion resistance and high electric and heat conductivity coefficient can be obtained on the surface of a microwave connector or a cable joint, and the electric and physical properties of the composite coating can be obviously enhanced.
Drawings
FIG. 1 is a schematic view of electroplating according to the present invention;
FIG. 2 is a 1000-fold magnification of a Ni-WC coating produced by a conventional aqueous plating method;
FIG. 3 shows that the Ni-WC plating layer prepared by the electroplating method of the scheme is enlarged by 1000 times.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A method for plating a Ni-WC composite layer on the surface of a microwave communication device by low-temperature molten salt comprises the following steps:
1) the inorganic salt LiNO3、NaNO3、KNO3、Ca(NO3)2、NaNO2、KNO2、LiCl、NaCl、 KCl、CaCl2Drying, grinding and grinding, wherein the weight percentage is 15%: 8%: 10%: 5%: 10%: 30%: 2%: 5%: 5%: 10 percent of the mixed salt is prepared into mixed salt, the mixed salt is heated and melted into liquid at 100 ℃, then the mixed salt is poured into a plating bath and heated to keep the liquid state, the melting point of the low-melting mixed salt plating solution is 60 ℃, and the mixed salt plating solution is heated and melted at 100 ℃ for higher fluidity of the electrolyte;
2) continuously adding one or more of 0.5-2% of nickel chloride, 0.5-2% of nickel nitrate, 0.5-2% of nickel sulfate and 1-3% of micro-nano tungsten carbide in percentage by weight into the molten salt electroplating bath, and adding appropriate amount of 0.5-1% of sodium hydrogen phosphate and 0.5-1.5% of boric acid in percentage by weight to form composite electroplating solution;
3) ultrasonic cleaning in 0.5mol/L dilute nitric acid and 0.5mol/L dilute NaOH solution for 2min, ultrasonic cleaning in distilled water for 5min, and air drying;
4) the electrolytic bath, the cathode and the anode are assembled and electroplated under the action of an external voltage-stabilizing direct-current power supply, so that the Ni-WC composite coating can be obtained on the surface of the cathode (microwave connector).
Specifically, the electroplating under the external voltage-stabilizing direct-current power supply specifically comprises the following steps:
firstly, the cell voltage is controlled to be 2V-4V, and the current density is controlled to be 20-50mA/cm2Pre-electroplating for 0.5-1h, and increasing current density to 60-200mA/cm2Normal electroplating is carried out, and Ni-WC composite coatings with different thicknesses of 10-300 microns can be obtained on the surface of a cathode (microwave connector) by controlling the electroplating timeAnd ultrasonically cleaning the obtained composite plating layer in distilled water for 5min, and airing.
The first embodiment is as follows:
a method for plating a Ni-WC composite layer on the surface of a microwave communication device by low-temperature molten salt comprises the following steps:
1) the inorganic salt LiNO3、NaNO3、KNO3、Ca(NO3)2、NaNO2、KNO2、LiCl、NaCl、 KCl、CaCl2Drying, grinding and grinding, wherein the weight percentage is 15%: 8%: 10%: 5%: 10%: 30%: 2%: 5%: 5%: 10 percent of the mixed salt is prepared into mixed salt, the mixed salt is heated and melted into liquid at 100 ℃, then the mixed salt is poured into a plating bath and heated to keep the liquid state, the melting point of the low-melting mixed salt plating solution is 60 ℃, and the mixed salt plating solution is heated and melted at 100 ℃ for higher fluidity of the electrolyte;
2) continuously adding one or more of nickel chloride with the weight percentage of 0.5%, nickel nitrate with the weight percentage of 0.5%, nickel sulfate with the weight percentage of 0.5% and micro-nano tungsten carbide with the weight percentage of 1% and adding proper amount of sodium hydrogen phosphate with the weight percentage of 0.5% and boric acid with the weight percentage of 0.5% to form composite electroplating liquid;
3) ultrasonic cleaning in 0.5mol/L dilute nitric acid and 0.5mol/L dilute NaOH solution for 2min, ultrasonic cleaning in distilled water for 5min, and air drying;
4) the electrolytic bath, the cathode and the anode are assembled and electroplated under the action of an external voltage-stabilizing direct-current power supply, so that the Ni-WC composite coating can be obtained on the surface of the cathode (microwave connector).
Specifically, the electroplating under the external voltage-stabilizing direct-current power supply specifically comprises the following steps:
firstly, the cell voltage is controlled to be 2V-4V, and the current density is controlled to be 20-50mA/cm2Pre-electroplating for 0.5-1h, and increasing current density to 60-200mA/cm2Performing normal electroplating, controlling electroplating time to obtain Ni-WC composite coatings with different thicknesses of 10-300 μm on the surface of cathode (microwave connector), ultrasonically cleaning the composite coatings in distilled water for 5min, and air dryingCan be prepared.
Example two:
a method for plating a Ni-WC composite layer on the surface of a microwave communication device by low-temperature molten salt comprises the following steps:
1) the inorganic salt LiNO3、NaNO3、KNO3、Ca(NO3)2、NaNO2、KNO2、LiCl、NaCl、 KCl、CaCl2Drying, grinding and grinding, wherein the weight percentage is 15%: 8%: 10%: 5%: 10%: 30%: 2%: 5%: 5%: 10 percent of the mixed salt is prepared into mixed salt, the mixed salt is heated and melted into liquid at 100 ℃, then the mixed salt is poured into a plating bath and heated to keep the liquid state, the melting point of the low-melting mixed salt plating solution is 60 ℃, and the mixed salt plating solution is heated and melted at 100 ℃ for higher fluidity of the electrolyte;
2) continuously adding one or more of nickel chloride with the weight percentage of 1.25%, nickel nitrate with the weight percentage of 1.25%, nickel sulfate with the weight percentage of 1.25% and micro-nano tungsten carbide with the weight percentage of 2% and adding proper amount of sodium hydrogen phosphate with the weight percentage of 0.75% and boric acid with the weight percentage of 1% into the molten salt plating bath to form composite plating solution;
3) ultrasonic cleaning in 0.5mol/L dilute nitric acid and 0.5mol/L dilute NaOH solution for 2min, ultrasonic cleaning in distilled water for 5min, and air drying;
4) the electrolytic bath, the cathode and the anode are assembled and electroplated under the action of an external voltage-stabilizing direct-current power supply, so that the Ni-WC composite coating can be obtained on the surface of the cathode (microwave connector).
Specifically, the electroplating under the external voltage-stabilizing direct-current power supply specifically comprises the following steps:
firstly, the cell voltage is controlled to be 2V-4V, and the current density is controlled to be 20-50mA/cm2Pre-electroplating for 0.5-1h, and increasing current density to 60-200mA/cm2And (3) carrying out normal electroplating, controlling the electroplating time to obtain Ni-WC composite coatings with different thicknesses of 10-300 micrometers on the surface of a cathode (microwave connector), ultrasonically cleaning the obtained composite coatings in distilled water for 5min, and airing.
Example three:
a method for plating a Ni-WC composite layer on the surface of a microwave communication device by low-temperature molten salt comprises the following steps:
1) the inorganic salt LiNO3、NaNO3、KNO3、Ca(NO3)2、NaNO2、KNO2、LiCl、NaCl、 KCl、CaCl2Drying, grinding and grinding, wherein the weight percentage is 15%: 8%: 10%: 5%: 10%: 30%: 2%: 5%: 5%: 10 percent of the mixed salt is prepared into mixed salt, the mixed salt is heated and melted into liquid at 100 ℃, then the mixed salt is poured into a plating bath and heated to keep the liquid state, the melting point of the low-melting mixed salt plating solution is 60 ℃, and the mixed salt plating solution is heated and melted at 100 ℃ for higher fluidity of the electrolyte;
2) continuously adding one or more of 2% of nickel chloride, 2% of nickel nitrate, 2% of nickel sulfate and 3% of micro-nano tungsten carbide in percentage by weight and adding a proper amount of 1% of sodium hydrogen phosphate and 1.5% of boric acid in percentage by weight into the molten salt electroplating bath to form a composite electroplating solution;
3) ultrasonic cleaning in 0.5mol/L dilute nitric acid and 0.5mol/L dilute NaOH solution for 2min, ultrasonic cleaning in distilled water for 5min, and air drying;
4) the electrolytic bath, the cathode and the anode are assembled and electroplated under the action of an external voltage-stabilizing direct-current power supply, so that the Ni-WC composite coating can be obtained on the surface of the cathode (microwave connector).
Specifically, the electroplating under the external voltage-stabilizing direct-current power supply specifically comprises the following steps:
firstly, the cell voltage is controlled to be 2V-4V, and the current density is controlled to be 20-50mA/cm2Pre-electroplating for 0.5-1h, and increasing current density to 60-200mA/cm2And (3) carrying out normal electroplating, controlling the electroplating time to obtain Ni-WC composite coatings with different thicknesses of 10-300 micrometers on the surface of a cathode (microwave connector), ultrasonically cleaning the obtained composite coatings in distilled water for 5min, and airing.
Comparative example of plating:
(1) preparing a Ni-WC plating layer by adopting a traditional electrolyte aqueous solution electroplating method:
adding one or a mixture of more of 5-20% by weight of nickel chloride, 5-20% by weight of nickel nitrate, or 5-20% by weight of nickel sulfate aqueous solution into the electroplating bath, adding 2-3% by weight of micro-nano tungsten carbide, and adding a proper amount of 1% by weight of sodium hydrogen phosphate and 1.5% by weight of boric acid to form an electroplating aqueous solution. And (3) taking a microwave connector as a cathode and a glassy carbon electrode as an anode, respectively ultrasonically cleaning in 0.5mol/L dilute nitric acid and 0.5mol/L dilute NaOH solution for 2min, ultrasonically cleaning in distilled water for 5min, and airing for later use. The electrolytic bath, the cathode and the anode are assembled and are electroplated under the external voltage-stabilizing direct current power supply. Firstly, the cell voltage is controlled to be 2V-4V, and the current density is controlled to be 20-50mA/cm2Pre-electroplating for 0.5-1h, and increasing current density to 60-200mA/cm2And carrying out normal electroplating. Ni-WC composite coatings with different thicknesses of 10-300 micrometers can be obtained on the surface of a cathode (microwave connector) by controlling the electroplating time, the obtained composite coatings are ultrasonically cleaned in distilled water for 5min and then dried, and then scanning electron micrographs of the composite coatings are tested so as to observe a micro-area surface topography of the coatings (see figure 2).
As can be seen from FIG. 2, the Ni-WC plating layer prepared by the conventional electrolytic aqueous solution plating method had rough and uneven surface, and the accumulation of small spherical particles was clearly seen. The reason may be that there is a problem of hydrogen embrittlement due to competitive reduction of hydrogen ions as a side reaction of electroplating; on the other hand, the tungsten carbide self-agglomeration may be caused in the aqueous solution due to the larger density difference between the tungsten carbide fine particles and the aqueous solution, and the large particles after the agglomeration are synchronously deposited with the coating in the electroplating process, so that the coating is obviously rough.
(2) The Ni-WC plating layer is prepared by adopting the low-temperature molten salt composite electroplating method according to the scheme:
the inorganic salt LiNO3、NaNO3、KNO3、Ca(NO3)2、NaNO2、KNO2、LiCl、NaCl、KCl、 CaCl2Drying, grinding and grinding, wherein the weight percentage is 15%: 8%: 10%: 5%: 10%: 30%: 2%: 5%: 5%: is 10% toMixing the salts, heating to melt at 100 deg.C, pouring into electroplating bath, heating to 100 deg.C, and keeping the liquid state; and continuously adding one or more of 2% by weight of nickel chloride, 2% by weight of nickel nitrate, 2% by weight of nickel sulfate and 3% by weight of micro-nano tungsten carbide into the molten salt electroplating bath, and adding a proper amount of 1% by weight of sodium hydrogen phosphate and 1.5% by weight of boric acid to form the composite electroplating solution. And (3) taking a microwave connector as a cathode and a glassy carbon electrode as an anode, respectively ultrasonically cleaning in 0.5mol/L dilute nitric acid and 0.5mol/L dilute NaOH solution for 2min, ultrasonically cleaning in distilled water for 5min, and airing for later use. The electrolytic bath, the cathode and the anode are assembled and are electroplated under the external voltage-stabilizing direct current power supply. Firstly, the cell voltage is controlled to be 2V-4V, and the current density is controlled to be 20-50mA/cm2Pre-electroplating for 0.5-1 hr, and increasing current density to 60-200mA/cm2And carrying out normal electroplating. Ni-WC composite coatings with different thicknesses of 10-300 micrometers can be obtained on the surface of a cathode (microwave connector) by controlling the electroplating time, the obtained composite coatings are ultrasonically cleaned in distilled water for 5min and then dried, and then scanning electron micrographs of the composite coatings are tested so as to observe a micro-area surface topography of the coatings (see figure 3).
Compared with the coating (figure 2) obtained by the traditional aqueous solution electroplating, the scanning electron microscope result in figure 3 shows that the Ni-WC coating obtained by the molten salt composite electroplating has a smoother, more compact and more uniform surface, no sand holes and no bubbles under the same multiple of 1000 times, which indicates that the low-temperature molten salt electroplating process and the effect are obviously superior to the traditional aqueous solution electroplating method.
In summary, the following steps: the invention adopts a low melting point mixed molten salt system of Li, Na, K, Ca and NO3,NO2And Cl, putting the aluminum alloy into an electrolytic bath, heating the aluminum alloy to keep the aluminum alloy in a liquid state, adding one or more of nickel chloride, nickel nitrate, nickel sulfate and micro-nano tungsten carbide, taking a microwave connector as a cathode and an inert metal platinum sheet or glassy carbon electrode as an anode, and electroplating under the action of an external voltage-stabilizing direct-current power supply to obtain a metal nickel and tungsten carbide composite coating on the surface of the cathode (the microwave connector)The hardness is improved by 30 percent, the corrosion resistance is improved by 40 percent, and the surface thickness is increased by no more than 30 micrometers.
The foregoing is only a preferred embodiment of the present invention; the scope of the invention is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.
Claims (5)
1. A method for plating a Ni-WC composite layer on the surface of a microwave communication device by low-temperature molten salt is characterized by comprising the following steps:
1) the inorganic salt LiNO3、NaNO3、KNO3、Ca(NO3)2、NaNO2、KNO2、LiCl、NaCl、KCl、CaCl2Drying, grinding to obtain mixed salt, heating at 100 deg.C to melt into liquid, and heating in electroplating bath to maintain the liquid state;
2) continuously adding one or a mixture of more of nickel chloride, nickel nitrate, nickel sulfate and micro-nano tungsten carbide in the molten salt electroplating bath, and adding a proper amount of sodium hydrogen phosphate and boric acid to form a composite electroplating solution;
3) ultrasonic cleaning in 0.5mol/L dilute nitric acid and 0.5mol/L dilute NaOH solution for 2min, ultrasonic cleaning in distilled water for 5min, and air drying;
4) the electrolytic bath, the cathode and the anode are assembled and electroplated under the action of an external voltage-stabilizing direct-current power supply, so that the Ni-WC composite coating can be obtained on the surface of the cathode microwave connector.
2. The method for reinforcing the surface of the microwave communication device by plating the Ni-WC composite layer through the low-temperature molten salt according to claim 1, wherein the method comprises the following steps: the LiNO3、NaNO3、KNO3、Ca(NO3)2、NaNO2、KNO2、LiCl、NaCl、KCl、CaCl2In percent by weight ofExample 15%: 8%: 10%: 5%: 10%: 30%: 2%: 5%: 5%: 10 percent.
3. The method for reinforcing the surface of the microwave communication device by plating the Ni-WC composite layer through the low-temperature molten salt according to claim 1, wherein the method comprises the following steps: the weight percentage of the nickel chloride is 0.5-2%, the weight percentage of the nickel nitrate is 0.5-2%, the weight percentage of the nickel sulfate is 0.5-2%, and the weight percentage of the micro-nano tungsten carbide is 1-3%.
4. The method for reinforcing the surface of the microwave communication device by plating the Ni-WC composite layer through the low-temperature molten salt according to claim 1, wherein the method comprises the following steps: the weight percentages of the sodium hydrogen phosphate and the boric acid are respectively 0.5 to 1 percent and 0.5 to 1.5 percent.
5. The method for reinforcing the surface of the microwave communication device by plating the Ni-WC composite layer through the low-temperature molten salt according to claim 1, wherein the method comprises the following steps: the electroplating under the external voltage-stabilizing direct-current power supply specifically comprises the following steps:
firstly, the cell voltage is controlled to be 2V-4V, and the current density is controlled to be 20-50mA/cm2Pre-electroplating for 0.5-1h, then increasing the current density to 60-200mA/cm2 for normal electroplating, obtaining Ni-WC composite coatings with different thicknesses of 10-300 microns on the surface of the cathode microwave connector by controlling the electroplating time, ultrasonically cleaning the obtained composite coatings in distilled water for 5min, and airing.
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