A production process for electroplating anodes

Abstract

The present invention relates to a production process for electroplating anodes, belonging to the field of surface treatment technology. The electroplating anode uses a titanium plate as a substrate, and the surface is sequentially composed of an iridium oxide-doped carbon layer and a tantalum oxide-enriched layer. The iridium oxide-doped carbon layer is carbonized with modified polyaniline. The nitrogen-oxygen structure introduced during the modification process chelates the clean substrate and captures tantalum compounds in the surface coating liquid. Each adhesion layer is denser and has a higher bonding strength. The carbonized layer is different from the traditional valve metal protective layer. It is filled between the titanium base layer and the tantalum-enriched layer. During the electroplating process, no passivation film is generated, which would cause the problem of double passivation film segregation. This makes the overall structure of the electroplating anode stable. In tests, it shows excellent stability, with an accelerated life of more than 3000 hours, which is significantly better than the existing iridium-tantalum coated titanium anode plate.

Description

Technical Field

[0001] The present invention belongs to the technical field of surface treatment, and in particular relates to a production process of electroplating anodes. Background Art

[0002] Electroplating is the process of plating a thin layer of other metals or alloys on certain metal surfaces using the principle of electrolysis. It is a process of using electrolysis to adhere a layer of metal film to the surface of metal or other material parts, thereby preventing metal oxidation, improving wear resistance, conductivity, reflectivity, corrosion resistance and enhancing aesthetics.

[0003] In the electroplating industry, nickel plating, zinc plating, and copper plating are common electroplating processes. In electroplating, traditional anodes are mostly soluble anodes, which serve to replenish the main salt concentration. However, in actual production, because the anode undergoes both electrochemical and chemical dissolution, the anode efficiency is higher than the cathode efficiency, causing the main salt concentration and pH in the plating solution to continuously increase. To control the stability of the plating solution, the plating solution state must be monitored and maintained. Electroplating quality is difficult to control, and regular anode replacement and bath composition adjustment are required. This is inconvenient and produces a large amount of wastewater.

[0004] Without solving the defects of soluble anodes, insoluble anodes have gradually been developed. Existing insoluble anode materials mainly include platinum, graphite, lead-based alloys and DSA anodes. Among them, platinum anodes will dissolve in an oxygen-containing acid environment, lead-based alloys are prone to lead poisoning as anodes, and graphite anodes have poor stability and are prone to disintegration and detachment during service. DSA anodes are new composite anodes, which use titanium as a matrix and are coated with valve metals such as tantalum, zirconium, and iridium as a coating on the surface. The surface tolerance is good and the electroplating quality is stable. The most widely used in the existing technology is the Ir-Ta coated titanium anode. However, it still has a serious defect, namely, a double-layer passivation film is formed between the titanium substrate and the coating during the electroplating process. The passivation film causes the coating to separate from the substrate, causing the coating to slowly fall off. These detached materials are dispersed into the plating solution, causing the cell voltage to rise, thereby increasing the energy consumption of electroplating. Summary of the Invention

[0005] In order to solve the technical problems mentioned in the background technology, the purpose of the present invention is to provide a production process of electroplating anodes.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A production process for electroplating anodes specifically includes the following steps:

[0008] Step S1: polishing, alkaline degreasing, oxalic acid etching, cleaning and drying the titanium plate in sequence to obtain a clean substrate;

[0009] Step S2: Modified polyaniline and N-methylpyrrolidone are mixed to prepare a bottom immersion liquid, and the clean substrate is repeatedly immersed and baked in the bottom immersion liquid to obtain a dip-coated substrate;

[0010] Step S3: Tantalum pentachloride and anhydrous methanol are mixed, polyvinyl alcohol is added to adjust the room temperature viscosity to 2000±50 cP, and a topcoat liquid is prepared. The topcoat liquid is then repeatedly scraped and baked on the surface of the coated substrate, and surface impurities are cleaned to obtain an electroplating anode.

[0011] Furthermore, the mass fraction of the modified polyaniline in the bottom immersion liquid is 8-12%, and the thickness of the dry film after immersion and baking is 5±0.5 μm.

[0012] Furthermore, the dosage ratio of tantalum pentachloride and anhydrous methanol in the topcoat solution is 1g / 20mL, and the scraping amount of the topcoat solution is 20-30mg / cm 2 .

[0013] Furthermore, the baking process of the topcoat liquid is: first stage, 120-150°C / 20-30min; second stage, 410-450°C / 1-1.5h; third stage, 530-550°C / 15-20min.

[0014] Furthermore, the top coating liquid scraping and baking are repeated no less than twice.

[0015] The modified polyaniline is prepared by the following method:

[0016] Step A1: Diethanolamine, triethylamine, and anhydrous ethanol are mixed and nitrogen atmosphere is introduced. The temperature is raised to 65-75° C. and mechanical stirring is applied at 120-180 rpm. Methallyl chloride is slowly added. After complete addition, stirring is continued at a constant temperature to react. The total addition reaction time of methallyl chloride is controlled to be 2.2-2.8 hours. After the reaction is completed, ethanol is removed to obtain a modifier.

[0017] Furthermore, the usage ratio of diethanolamine, methallyl chloride, triethylamine and anhydrous ethanol is 0.1 mol: 0.1 mol: 4-5 mL: 35-50 mL, and the active chlorine in methallyl chloride is replaced with the secondary amine structure of diethanolamine to graft double bonds for modification.

[0018] Step A2: Aniline, hydrochloric acid, and tetrahydrofuran are mixed, nitrogen is introduced, the temperature is controlled to be no higher than 5° C. in an ice-water bath, ammonium persulfate is added, and the mixture is stirred at 40-60 rpm for 3.5-4 hours. The mixture is then heated to 40-50° C., chloroiridic acid is added, and the mixture is mixed. A modifier is slowly added, and the total reaction time for the addition of the modifier is controlled to be 1.8-2.5 hours. After the reaction is completed, the liquid phase is removed, and the mixture is washed with deionized water and dried to obtain modified polyaniline;

[0019] Furthermore, the usage ratio of aniline, modifier, hydrochloric acid, ammonium persulfate, chloroiridic acid and tetrahydrofuran is 0.1 mol: 4.6-5.5 g: 60-80 mL: 1-1.3 g: 15-20 mg: 100-120 mL. Hydrochloric acid, as a protonic acid, promotes the polymerization of aniline to form a small molecule polymer under the initiation of ammonium persulfate. The added chloroiridic acid promotes the repolymerization of the small molecule polymer and simultaneously initiates the addition of double bonds in the modifier to the secondary amine structure in the polyaniline, thereby grafting the modifier molecules onto the molecular side chains of the polyaniline.

[0020] Beneficial effects of the present invention:

[0021] The electroplating anode of the present invention uses a titanium plate as a substrate, and has an iridium oxide-doped carbon layer and a tantalum oxide-enriched layer on its surface in sequence. The iridium oxide-doped carbon layer is carbonized with modified polyaniline, and the modified polyaniline is prepared by replacing the grafted double bonds with the secondary amine structures of methallyl chloride and diethanolamine to form a modifier. Aniline is then initiated by hydrochloric acid and ammonium persulfate to form a small molecule polymer. Chloroiridic acid is then used to initiate the addition of the double bonds in the modifier and the secondary amine structures in the small molecule polyaniline, so that the modifier molecules are grafted onto the molecular side chains of the polyaniline. The nitrogen and oxygen structures in the modifier molecules of the modified polyaniline molecular side chains form a chelating effect, so that during the bottom leaching process, the modified polyaniline macromolecules are closely attached to the surface of the clean substrate. During the top coating process, the modified polyaniline captures the tantalum compounds in the top coating, so that the clean substrate and each attachment layer are more dense and have higher bonding strength. The tantalum oxide layer formed by chelation roasting has good tolerance and density, protects the middle carbonized layer, and reduces the corrosion of the electroplating solution on the carbonized layer; it is not easy to fall off during service; secondly, the regularly arranged benzene ring structure in the modified polyaniline molecular chain forms a continuously interconnected carbonized network after carbonization, so that the carbonized layer maintains good electrical conductivity, and the side chain modifier molecules chelate and capture the catalyst chloroiridic acid to form iridium oxide during the roasting and carbonization process, thereby improving the electrical conductivity of the carbonized layer; in addition, the carbonized layer is different from the traditional valve metal protective layer. It is filled between the titanium base layer and the tantalum-rich layer, and no passivation film is generated during the electroplating process, forming a double passivation film segregation problem, which makes the overall structure of the electroplating anode stable. In the test, it showed excellent stability, with an accelerated life of more than 3000h, which is significantly better than the existing iridium-tantalum coated titanium anode plate. DETAILED DESCRIPTION

[0022] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0023] Example 1

[0024] This embodiment prepares the electroplating anode, and the specific implementation process is as follows:

[0025] 1) Preparation of modified polyaniline

[0026] Step A1: Diethanolamine, triethylamine, and anhydrous ethanol were added, stirred, and mixed. Nitrogen protection was introduced, and the temperature was raised to 75° C. and mechanical stirring was applied at 180 rpm. Methallyl chloride was slowly added over 1 hour. After complete addition, stirring was continued at a constant temperature to react. The total addition reaction time of methallyl chloride was controlled to be 2.2 hours. During the reaction, the amount ratio of diethanolamine, methallyl chloride, triethylamine, and anhydrous ethanol was 0.1 mol: 0.1 mol: 4 mL: 50 mL. After the reaction was completed, ethanol was removed by rotary evaporation to obtain a modifier.

[0027] Step A2: Aniline, hydrochloric acid, and tetrahydrofuran were added and stirred, and nitrogen was introduced for protection. The temperature was controlled to be no higher than 5°C in an ice-water bath. Ammonium persulfate was added and mixed, and the mixture was stirred at 60 rpm for 3.5 hours. The temperature was then raised to 50°C, and chloroiridic acid was added and mixed. The modifier was slowly added over 20 minutes. After complete addition, the reaction was continued with constant stirring. The total reaction time for the addition of the modifier was controlled to be 1.8 hours. During the reaction, the ratio of aniline, modifier, hydrochloric acid, ammonium persulfate, chloroiridic acid, and tetrahydrofuran was 0.1 mol: 5.5 g: 80 mL: 1 g: 20 mg: 120 mL. After the reaction was completed, the liquid phase was removed by filtration, and the filtrate was washed with deionized water and dried to obtain modified polyaniline.

[0028] 2) Preparation of electroplating anode

[0029] Step S1: Take a titanium plate and use 1000-grit sandpaper to polish the surface impurities, then use sodium carbonate solution for alkaline washing and degreasing, and after cleaning, use 10% oxalic acid solution with a mass fraction to etch at 50°C for 2 hours, and then wash with deionized water and anhydrous ethanol in sequence and dry to obtain a clean substrate.

[0030] Step S2: Modified polyaniline and N-methylpyrrolidone are mixed and the mass fraction of modified polyaniline is controlled to 12% to prepare a bottom immersion solution. A clean substrate is immersed in the bottom immersion solution. After being taken out and leveled, it is placed in an oven and dried at 120±5°C. The immersion and baking are repeated until the dry film thickness reaches 5±0.5μm to obtain a dip-coated substrate.

[0031] Step S3: Take tantalum pentachloride and anhydrous methanol at a ratio of 1g / 20mL, add polyvinyl alcohol (1788-160 type raw material is used in the embodiment) and adjust the room temperature viscosity to 2000±50cP to prepare a top coating liquid, and apply the top coating liquid on the surface of the coated substrate with a control amount of 30mg / cm 2, then placed in a muffle furnace, first heated to 120℃, kept warm for 30min, then continued to heat to 450℃, kept warm for 1h, then heated to 550℃, kept warm for 15min, cooled with the furnace, and then repeated scraping and baking twice, finally cleaned the surface impurities to obtain the electroplating anode.

[0032] Example 2

[0033] This embodiment prepares the electroplating anode, and the specific implementation process is as follows:

[0034] 1) Preparation of modified polyaniline

[0035] Step A1: Diethanolamine, triethylamine, and anhydrous ethanol were added, stirred, and mixed. Nitrogen protection was introduced, and the temperature was raised to 65° C. and mechanical stirring was applied at 120 rpm. Methallyl chloride was slowly added over 1.5 hours. After complete addition, stirring was continued at a constant temperature to react. The total addition reaction time of methallyl chloride was controlled to be 2.8 hours. During the reaction, the amount ratio of diethanolamine, methallyl chloride, triethylamine, and anhydrous ethanol was 0.1 mol: 0.1 mol: 5 mL: 35 mL. After the reaction was completed, ethanol was removed by rotary evaporation to obtain a modifier.

[0036] Step A2: Aniline, hydrochloric acid, and tetrahydrofuran were added and stirred, and nitrogen was introduced for protection. The temperature was controlled to be no higher than 5°C in an ice-water bath. Ammonium persulfate was added and mixed, and the mixture was stirred at 40 rpm for 4 hours. The temperature was then raised to 40°C, and chloroiridic acid was added and mixed. The modifier was slowly added over 40 minutes. After complete addition, the reaction was continued with constant stirring. The total addition reaction time of the modifier was controlled to be 2.5 hours. During the reaction, the amount ratio of aniline, modifier, hydrochloric acid, ammonium persulfate, chloroiridic acid, and tetrahydrofuran was 0.1 mol: 4.6 g: 60 mL: 1.3 g: 15 mg: 100 mL. After the reaction was completed, the liquid phase was removed by filtration, and the filtrate was washed with deionized water and dried to obtain modified polyaniline.

[0037] 2) Preparation of electroplating anode

[0038] Step S1: Take a titanium plate and use 1000-grit sandpaper to polish the surface impurities, then use sodium carbonate solution for alkaline washing and degreasing, and after cleaning, use 10% oxalic acid solution with a mass fraction to etch at 50°C for 2 hours, and then wash with deionized water and anhydrous ethanol in sequence and dry to obtain a clean substrate.

[0039] Step S2: Modified polyaniline and N-methylpyrrolidone are mixed and the mass fraction of modified polyaniline is controlled to 8% to prepare a bottom immersion solution. A clean substrate is immersed in the bottom immersion solution. After being taken out and leveled, it is placed in an oven and dried at 120±5°C. The immersion and baking are repeated until the dry film thickness reaches 5±0.5μm to obtain a dip-coated substrate.

[0040] Step S3: Mix tantalum pentachloride and anhydrous methanol at a ratio of 1g / 20mL, add polyvinyl alcohol to adjust the room temperature viscosity to 2000±50cP, and prepare a topcoat solution. Apply the topcoat solution to the surface of the coated substrate with a scraping amount of 20mg / cm 2 , then placed in a muffle furnace, first at 150℃, keep warm for 20 minutes, then continue to heat up to 410℃, keep warm for 1.5 hours, then heat up to 530℃, keep warm for 20 minutes, cool with the furnace, repeat the scraping and baking 3 times, and finally clean the surface impurities to obtain the electroplating anode.

[0041] Example 3

[0042] This embodiment prepares the electroplating anode, and the specific implementation process is as follows:

[0043] 1) Preparation of modified polyaniline

[0044] Step A1: Diethanolamine, triethylamine, and anhydrous ethanol were added, stirred, and mixed. Nitrogen protection was introduced, the temperature was raised to 70° C., mechanical stirring was applied at 180 rpm, and methallyl chloride was slowly added over 1.2 hours. After complete addition, stirring was continued at a constant temperature to react. The total addition reaction time of methallyl chloride was controlled to be 2.5 hours. During the reaction, the amount ratio of diethanolamine, methallyl chloride, triethylamine, and anhydrous ethanol was 0.1 mol: 0.1 mol: 5 mL: 45 mL. After the reaction was completed, ethanol was removed by rotary evaporation to obtain a modifier.

[0045] Step A2: Aniline, hydrochloric acid, and tetrahydrofuran were added and stirred, and nitrogen was introduced for protection. The temperature was controlled to be no higher than 5°C in an ice-water bath. Ammonium persulfate was added and mixed, and the mixture was stirred at 55 rpm for 3.8 hours. The temperature was then raised to 45°C, and chloroiridic acid was added and mixed. The modifier was slowly added over 30 minutes. After complete addition, the reaction was continued with constant stirring. The total reaction time for the addition of the modifier was controlled to be 2.2 hours. During the reaction, the ratio of aniline, modifier, hydrochloric acid, ammonium persulfate, chloroiridic acid, and tetrahydrofuran was 0.1 mol: 5 g: 70 mL: 1.1 g: 18 mg: 100 mL. After the reaction was completed, the liquid phase was removed by filtration, and the filtrate was washed with deionized water and dried to obtain modified polyaniline.

[0046] 2) Preparation of electroplating anode

[0047] Step S1: Take a titanium plate and use 1000-grit sandpaper to polish the surface impurities, then use sodium carbonate solution for alkaline washing and degreasing, and after cleaning, use 10% oxalic acid solution with a mass fraction to etch at 50°C for 2 hours, and then wash with deionized water and anhydrous ethanol in sequence and dry to obtain a clean substrate.

[0048] Step S2: Modified polyaniline and N-methylpyrrolidone are mixed and the mass fraction of modified polyaniline is controlled to 10% to prepare a bottom immersion liquid. A clean substrate is immersed in the bottom immersion liquid. After being taken out and leveled, it is placed in an oven and dried at 120±5°C. The immersion and baking are repeated until the dry film thickness reaches 5±0.5μm to obtain a dip-coated substrate.

[0049] Step S3: Mix tantalum pentachloride and anhydrous methanol at a ratio of 1g / 20mL, add polyvinyl alcohol to adjust the room temperature viscosity to 2000±50cP, and prepare a topcoat solution. Apply the topcoat solution to the surface of the coated substrate with a scraping amount of 25mg / cm 2 , then placed in a muffle furnace, first heated to 130℃, kept warm for 28min, then continued to heat to 430℃, kept warm for 1.3h, then heated to 550℃, kept warm for 18min, cooled with the furnace, and then repeated scraping and baking twice, finally cleaned the surface impurities to obtain the electroplating anode.

[0050] Example 4

[0051] This embodiment prepares the electroplating anode, and the specific implementation process is as follows:

[0052] 1) Preparation of modified polyaniline

[0053] Step A1: Diethanolamine, triethylamine, and anhydrous ethanol were added, stirred, and mixed. Nitrogen protection was introduced, and the temperature was raised to 70° C. and mechanical stirring was applied at 120 rpm. Methallyl chloride was slowly added over 1.3 hours. After complete addition, stirring was continued at a constant temperature to react. The total addition reaction time of methallyl chloride was controlled to be 2.6 hours. During the reaction, the amount ratio of diethanolamine, methallyl chloride, triethylamine, and anhydrous ethanol was 0.1 mol: 0.1 mol: 5 mL: 40 mL. After the reaction was completed, ethanol was removed by rotary evaporation to obtain a modifier.

[0054] Step A2: Aniline, hydrochloric acid, and tetrahydrofuran were added and stirred, and nitrogen was introduced for protection. The temperature was controlled to be no higher than 5°C in an ice-water bath. Ammonium persulfate was added and mixed, and the mixture was stirred at 40 rpm for 4 hours. The temperature was then raised to 45°C, and chloroiridic acid was added and mixed. The modifier was slowly added over 30 minutes. After complete addition, the reaction was continued with constant stirring. The total addition reaction time of the modifier was controlled to be 2 hours. During the reaction, the amount ratio of aniline, modifier, hydrochloric acid, ammonium persulfate, chloroiridic acid, and tetrahydrofuran was 0.1 mol: 5.2 g: 70 mL: 1.2 g: 15 mg: 120 mL. After the reaction was completed, the liquid phase was removed by filtration, and the filtrate was washed with deionized water and dried to obtain modified polyaniline.

[0055] 2) Preparation of electroplating anode

[0056] Step S1: Take a titanium plate and use 1000-grit sandpaper to polish the surface impurities, then use sodium carbonate solution for alkaline washing and degreasing, and after cleaning, use 10% oxalic acid solution with a mass fraction to etch at 50°C for 2 hours, and then wash with deionized water and anhydrous ethanol in sequence and dry to obtain a clean substrate.

[0057] Step S2: Modified polyaniline and N-methylpyrrolidone are mixed and the mass fraction of modified polyaniline is controlled to 10% to prepare a bottom immersion liquid. A clean substrate is immersed in the bottom immersion liquid. After being taken out and leveled, it is placed in an oven and dried at 120±5°C. The immersion and baking are repeated until the dry film thickness reaches 5±0.5μm to obtain a dip-coated substrate.

[0058] Step S3: Mix tantalum pentachloride and anhydrous methanol at a ratio of 1g / 20mL, add polyvinyl alcohol to adjust the room temperature viscosity to 2000±50cP, and prepare a topcoat solution. Apply the topcoat solution to the surface of the coated substrate with a scraping amount of 25mg / cm 2 , then placed in a muffle furnace, first heated to 120℃, kept warm for 30min, then continued to heat to 420℃, kept warm for 1.3h, then heated to 550℃, kept warm for 20min, cooled with the furnace, and then repeated scraping and baking 3 times, finally cleaned the surface impurities to obtain the electroplating anode.

[0059] Comparative Example

[0060] This comparative example is the most widely used iridium-tantalum coated titanium anode plate in the industry, provided by Shaanxi Titanium Plutonium Vanadium Metal Co., Ltd.

[0061] Take the electroplating anode obtained above and conduct accelerated life test. The specific operation is as follows:

[0062] Prepare a pure titanium plate with a size of 2×2 cm as the cathode and an electroplating anode with a size of 1×2 cm. Use 0.5 mol / L sulfuric acid solution as the medium. Set the distance between the anode and cathode plates to 1 cm, the temperature to 50°C, and the accelerating current to 2 A / cm 2 , when the cell voltage rises by 5V, it is recorded as failure, and the recorded time is the accelerated life. The specific test data is shown in Table 1:

[0063] Table 1

[0064]

[0065] As can be seen from the data in Table 1, the accelerated life of the electroplating anode prepared in the embodiment reaches 3035-3420 hours, which is much higher than the existing iridium-tantalum coated titanium anode plate, and can maintain good stability during the electroplating process.

[0066] In the description of the specification, the description with reference to the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. The above content is merely an example and explanation of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the invention or exceed the scope defined by the claims, they shall all fall within the scope of protection of the present invention.

Claims

1. A process for producing electroplating anodes, characterized in that: Including the following steps: Step S1: polishing, alkaline degreasing, oxalic acid etching, cleaning and drying the titanium plate in sequence to obtain a clean substrate; Step S2: Modified polyaniline and N-methylpyrrolidone are mixed to prepare a bottom immersion liquid, and the clean substrate is repeatedly immersed and baked in the bottom immersion liquid to obtain a dip-coated substrate; Step S3: Tantalum pentachloride and anhydrous methanol are mixed, polyvinyl alcohol is added to adjust the room temperature viscosity to 2000±50 cP, and a topcoat liquid is prepared. The topcoat liquid is then repeatedly scraped and baked on the surface of the coated substrate, and surface impurities are cleaned to obtain an electroplating anode; The modified polyaniline is prepared by the following method: Step A1: Diethanolamine, triethylamine, and anhydrous ethanol are mixed and nitrogen is introduced. The temperature is raised to 65-75°C, and methallyl chloride is slowly added while stirring. The total reaction time for the addition of methallyl chloride is controlled to be 2.2-2.8 hours. After the reaction is completed, ethanol is removed to obtain a modifier. The ratio of diethanolamine, methallyl chloride, triethylamine, and anhydrous ethanol is 0.1 mol: 0.1 mol: 4-5 mL: 35-50 mL. Step A2: Aniline, hydrochloric acid, and tetrahydrofuran are mixed, nitrogen is introduced for protection, the temperature is controlled to be no higher than 5° C. in an ice-water bath, ammonium persulfate is added, the mixture is stirred and reacted for 3.5-4 hours, then the temperature is raised to 40-50° C., chloroiridic acid is added and mixed, and a modifier is slowly added, with the total reaction time of the modifier being controlled to be 1.8-2.5 hours. After the reaction is completed, the liquid phase is removed, and the mixture is washed with deionized water and dried to obtain modified polyaniline, wherein the amount ratio of aniline, modifier, hydrochloric acid, ammonium persulfate, chloroiridic acid, and tetrahydrofuran is 0.1 mol: 4.6-5.5 g: 60-80 mL: 1-1.3 g: 15-20 mg: 100-120 mL.

2. The electroplating anode production process according to claim 1, characterized in that: The mass fraction of the modified polyaniline in the bottom immersion liquid is 8-12%, and the thickness of the dry film after immersion and baking is 5±0.5μm.

3. The electroplating anode production process according to claim 1, characterized in that: The dosage ratio of tantalum pentachloride and anhydrous methanol in the top coating liquid is 1g / 20mL, and the scraping amount of the top coating liquid is 20-30mg / cm2.

4. The electroplating anode production process according to claim 3, characterized in that: The calcination process of the topcoat liquid is: first stage, 120-150℃ / 20-30min; second stage, 410-450℃ / 1-1.5h; third stage, 530-550℃ / 15-20min.

5. The electroplating anode production process according to claim 4, characterized in that: The top coating liquid scraping and baking are repeated for no less than two times.

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