An electroplating process

Abstract

The present application relates to a kind of electroplating process, including S1. pre-plating pretreatment; washing, degreasing, rust removal; S2. electroplating; S3. post-plating treatment; post-processing the workpiece after electroplating with a passivating solution; then washing, drying at 60±5°C for 30-35min; the passivating solution includes the following components: hydrogen peroxide, citric acid, oleyl hydroxyethyl imidazoline, sebacic acid amide, crotonic anhydride, N-isovalerylaminoacetic acid, catalyst, dispersant and water. In the present application, a solid and dense film is formed on the coating by the passivating solution, so that the corrosion resistance of the coating is improved, and the surface gloss and anti-pollution ability can also be increased; the nitrogen atom on the imidazoline ring can form a coordination bond with the empty orbit of metallic iron and form adsorption on the metal surface, thereby playing a corrosion inhibition role; N-isovalerylaminoacetic acid, crotonic anhydride and sebacic acid amide react to generate condensation products, which are compounded with imidazoline compounds to produce corrosion inhibition synergistic effects, thereby improving the corrosion resistance of electroplated workpieces.

Description

Technical Field

[0001] The present application relates to the technical field of electroplating processes, and in particular to an electroplating process. Background Art

[0002] At present, the electroplated workpieces are sensitive to humid environments, industrial atmospheres and high temperature conditions after electroplating, which makes them prone to corrosion during production, storage, transportation and use. Therefore, surface passivation treatment is required; the traditional passivation solutions commonly used are strong oxidants such as concentrated nitric acid, concentrated sulfuric acid, chromic acid, etc., which have high safety risks and harsh operating conditions.

[0003] Chinese patent publication number CN103184494A discloses a copper electroplating process, which includes the following steps: dust and oil removal, ultrasonic cleaning, pickling and phosphating, activation, copper plating, water washing and drying, and winding and packaging.

[0004] With respect to the above-mentioned related technologies, the inventors believe that after the electroplating operation is completed, the corrosion resistance of the current electroplated workpiece is still insufficient, which may easily affect the service life of the electroplated workpiece, and there is still room for improvement. Summary of the invention

[0005] In order to improve the corrosion resistance of an electroplated workpiece, the present application provides an electroplating process.

[0006] The electroplating process provided in this application adopts the following technical solution:

[0007] An electroplating process comprises the following steps:

[0008] S1. Pretreatment before plating: washing, degreasing and rust removal;

[0009] S2. Electroplating;

[0010] S3. Post-plating treatment; the workpiece after electroplating is post-treated with a passivation solution, then washed with water, and dried at 60±5°C for 30-35min; the passivation solution comprises the following components in parts by weight:

[0011] 15-30 parts of hydrogen peroxide;

[0012] 10-20 parts citric acid;

[0013] 8-12 parts of oleyl hydroxyethyl imidazoline;

[0014] 6-8 parts of sebacamide;

[0015] 1-2 parts of crotonic anhydride;

[0016] 1-2 parts of N-isovalerylaminoacetic acid;

[0017] 1-2 parts of catalyst;

[0018] 5-6 parts of dispersant;

[0019] 80-100 parts water.

[0020] By adopting the above technical scheme, the workpiece after electroplating is passivated with a passivation solution, and a solid, dense and highly stable film is formed on the coating, so that the corrosion resistance of the coating is improved, and the surface gloss and anti-pollution ability can also be increased; the nitrogen atom on the imidazoline ring can form a coordination bond with the empty orbit of metal iron to form adsorption on the metal surface, thereby playing a corrosion inhibition role; the mixed anhydride is generated by mixing N-isovalerylaminoacetic acid and crotonic anhydride, and further reacts with sebacic acid amide to generate a condensation product containing an amide group and a carboxyl group, which is compounded with oleyl hydroxyethyl imidazoline to produce a corrosion inhibition synergistic effect, thereby improving the corrosion resistance of the electroplated workpiece after the passivation solution treatment and extending the service life of the electroplated workpiece.

[0021] Preferably, the passivation solution further comprises, by weight, 0.4-0.6 parts of carbon fiber, 3-4 parts of alkyd resin and 5-6 parts of toluene.

[0022] By adopting the above technical solution, carbon fiber is used to form a porous micro-rough structure to provide uniform bonding points. Alkyd resin has excellent corrosion resistance and good adhesion. The mixture of carbon fiber and alkyd resin can promote the mutual penetration and anchoring effect between the passivation film layer and the electroplating layer surface, enhance the adhesion of the passivation film layer, and improve the corrosion resistance life of the electroplated workpiece.

[0023] Preferably, the passivation solution further comprises 1-2 parts by weight of (E)-2-(5-chlorothiophen-2-yl)ethylenesulfonyl chloride and 0.4-0.6 parts by weight of an initiator.

[0024] By adopting the above technical scheme, (E)-2-(5-chlorothiophene-2-yl)ethylenesulfonyl chloride is further added to produce a copolymerization reaction with a dry alkyd resin containing a double bond, and at the same time, atoms such as sulfur and oxygen are further introduced. A synergistic effect is produced by the imidazoline compound and the copolymerized organic matter containing atoms such as sulfur and oxygen, which helps to form a more uniform and dense adsorption film and enhance the corrosion inhibition effect.

[0025] Preferably, the initiator is tert-butyl peroxybenzoate.

[0026] Preferably, the catalyst is 4-dimethylaminopyridine.

[0027] By adopting the technical scheme, 4-dimethylaminopyridine is used to catalyze the acylation reaction between the mixed anhydride of N-isovalerylaminoacetic acid and crotonic anhydride and sebacic acid amide.

[0028] Preferably, the dispersant is sodium dodecyl sulfate and nonylphenol polyoxyethylene ether in a weight ratio of 2:1.

[0029] By adopting the above technical solution, the composite dispersant helps to improve the compatibility of components and assists in improving the performance of the passivation liquid.

[0030] Preferably, the preparation method of the passivation solution is: stirring and blending crotonic anhydride, N-isovalerylaminoacetic acid and a dispersant at 30-35° C. to obtain a mixed anhydride, then adding sebacic acid amide and a catalyst, heating to 40-50° C., and reflux reaction for 1-2 hours to obtain a condensate;

[0031] The carbon fiber, alkyd resin and toluene are mixed and ultrasonically dispersed at a power of 30-50W for 15-20min; then (E)-2-(5-chlorothiophen-2-yl)ethylenesulfonyl chloride and an initiator are added, the temperature is raised to 30-40°C, and the reaction is stirred for 2-3h to obtain a carbon fiber copolymer mixture;

[0032] The condensate, the carbon fiber copolymer mixture, the oleyl hydroxyethyl imidazoline, the citric acid, the hydrogen peroxide and the water are mixed and stirred for 50-60 minutes.

[0033] Preferably, the passivation temperature of the passivation solution post-treatment is 40-45° C., and the passivation time is 1-1.5 h.

[0034] By adopting the above technical solution and taking a certain passivation temperature and passivation time, it is beneficial to the passivation liquid film formation to achieve the improvement of corrosion resistance.

[0035] In summary, this application includes the following beneficial technical effects:

[0036] 1. The workpiece after electroplating is passivated with a passivation solution to form a solid, dense and highly stable film on the coating, thereby improving the corrosion resistance of the coating and increasing the surface gloss and anti-pollution ability; the nitrogen atom on the imidazoline ring can form a coordination bond with the empty orbit of metal iron and form adsorption on the metal surface, thereby inhibiting corrosion; the mixed anhydride is generated by mixing N-isovalerylaminoacetic acid and crotonic anhydride, and further reacts with sebacic acid amide to generate a condensate, which is compounded with oleyl hydroxyethyl imidazoline to produce a synergistic corrosion inhibition effect, thereby improving the corrosion resistance of the electroplated workpiece after the passivation solution treatment and extending the service life of the electroplated workpiece;

[0037] 2. Carbon fiber is used to form a porous micro-rough structure, thereby providing uniform bonding points. Alkyd resin has excellent corrosion resistance and good adhesion. The mixture of carbon fiber and alkyd resin can promote the mutual penetration and anchoring of the passivation film layer and the electroplating layer surface, enhance the adhesion of the passivation film layer, and improve the corrosion resistance and life of the electroplated workpiece;

[0038] 3. Add (E)-2-(5-chlorothiophene-2-yl)ethylenesulfonyl chloride to produce a copolymerization reaction with the dry alkyd resin containing double bonds, and further introduce sulfur, oxygen and other atoms. The synergistic effect is produced by the imidazoline compound and the copolymerized organic matter containing sulfur, oxygen and other atoms, which helps to form a more uniform and dense adsorption film and improve the corrosion inhibition effect. DETAILED DESCRIPTION

[0039] The present application is described in further detail below.

[0040] In the present application, oleyl hydroxyethyl imidazoline is provided by Shandong Sanju Chemical Technology Co., Ltd., item number 92; crotonic anhydride is provided by Hubei Xinhongli Chemical Co., Ltd.; carbon fiber is provided by Zibo Yuxing New Material Technology Co., Ltd., 300 mesh, model YS-07, item number 02; alkyd resin is a dry alkyd resin provided by Foshan Nanhai Huangqi Chemical Glass Co., Ltd., brand 389-5, viscosity 100-200 (S); (E)-2-(5-chlorothiophen-2-yl)ethylenesulfonyl chloride is provided by Yaoming Lanbo (Wuhan) Chemical Technology Co., Ltd.

[0041] Unless otherwise specified, the raw materials used in the following embodiments can be obtained from common commercial sources.

[0042] The reaction product of crotonic anhydride, N-isovalerylaminoacetic acid and sebacic acid amide was analyzed by infrared spectroscopy; at 1300-1650cm -1 The vibration absorption peak of the amide group appears at 1428 cm -1 The vibration absorption peak of carboxyl OH appears at 1760 cm -1 The vibration absorption peak of the carboxyl group C=O appears at , indicating that a condensation reaction occurs to produce an amide group and a carboxyl group. Example

[0043] Example 1

[0044] This embodiment discloses an electroplating process, comprising the following steps:

[0045] S1. Pretreatment before plating: washing, degreasing and rust removal;

[0046] S2. Electroplating;

[0047] S3. Post-plating treatment; the workpiece after electroplating is post-treated with a passivation solution, the passivation temperature is 40°C, and the passivation time is 1h; then washed with water and dried at 55°C for 30min; the passivation solution includes the following components: hydrogen peroxide, citric acid, oleyl hydroxyethyl imidazoline, sebacic acid amide, crotonic anhydride, N-isovalerylaminoacetic acid, a catalyst, a dispersant and water, wherein the catalyst is 4-dimethylaminopyridine, and the dispersant is sodium dodecyl sulfate and nonylphenol polyoxyethylene ether in a weight ratio of 2:1, and the content of each component is shown in Table 1 below.

[0048] The preparation method of the passivation solution is as follows: crotonic anhydride, N-isovalerylaminoacetic acid and a dispersant are stirred and mixed at 30° C. to obtain a mixed anhydride, and then sebacic acid amide and a catalyst are added, the temperature is raised to 40° C., and refluxed for 1 hour to obtain a condensate;

[0049] The condensate, oleyl hydroxyethyl imidazoline, citric acid, hydrogen peroxide and water were mixed and stirred for 50 minutes.

[0050] Example 2

[0051] This embodiment discloses an electroplating process, comprising the following steps:

[0052] S1. Pretreatment before plating: washing, degreasing and rust removal;

[0053] S2. Electroplating;

[0054] S3. Post-plating treatment; the workpiece after electroplating is post-treated with a passivation solution, the passivation temperature is 45°C, and the passivation time is 1.5h; then washed with water and dried at 65°C for 35min; the passivation solution includes the following components: hydrogen peroxide, citric acid, oleyl hydroxyethyl imidazoline, sebacic acid amide, crotonic anhydride, N-isovalerylaminoacetic acid, a catalyst, a dispersant and water, wherein the catalyst is 4-dimethylaminopyridine, and the dispersant is sodium dodecyl sulfate and nonylphenol polyoxyethylene ether in a weight ratio of 2:1, and the content of each component is shown in Table 1 below.

[0055] The preparation method of the passivation solution is as follows: crotonic anhydride, N-isovalerylaminoacetic acid and a dispersant are stirred and mixed at 35° C. to obtain a mixed anhydride, and then sebacic acid amide and a catalyst are added, the temperature is raised to 50° C., and refluxed for 2 hours to obtain a condensation product;

[0056] The condensate, oleyl hydroxyethyl imidazoline, citric acid, hydrogen peroxide and water were mixed and stirred for 60 minutes.

[0057] Example 3

[0058] This embodiment discloses an electroplating process, comprising the following steps:

[0059] S1. Pretreatment before plating: washing, degreasing and rust removal;

[0060] S2. Electroplating;

[0061] S3. Post-plating treatment; the workpiece after electroplating is post-treated with a passivation solution, the passivation temperature is 42°C, and the passivation time is 1.2h; then washed with water and dried at 60°C for 33min; the passivation solution includes the following components: hydrogen peroxide, citric acid, oleyl hydroxyethyl imidazoline, sebacic acid amide, crotonic anhydride, N-isovalerylaminoacetic acid, a catalyst, a dispersant and water, wherein the catalyst is 4-dimethylaminopyridine, and the dispersant is sodium dodecyl sulfate and nonylphenol polyoxyethylene ether in a weight ratio of 2:1, and the content of each component is shown in Table 1 below.

[0062] The preparation method of the passivation solution is as follows: crotonic anhydride, N-isovalerylaminoacetic acid and a dispersant are stirred and mixed at 33° C. to obtain a mixed anhydride, and then sebacic acid amide and a catalyst are added, the temperature is raised to 45° C., and refluxed for 1.5 hours to obtain a condensate;

[0063] The condensate, oleyl hydroxyethyl imidazoline, citric acid, hydrogen peroxide and water were mixed and stirred for 55 minutes.

[0064] Example 4

[0065] This embodiment discloses an electroplating process, comprising the following steps:

[0066] S1. Pretreatment before plating: washing, degreasing and rust removal;

[0067] S2. Electroplating;

[0068] S3. Post-plating treatment; the workpiece after electroplating is post-treated with a passivation solution, the passivation temperature is 40°C, and the passivation time is 1h; then washed with water and dried at 55°C for 30min; the passivation solution includes the following components: hydrogen peroxide, citric acid, oleyl hydroxyethyl imidazoline, sebacic acid amide, crotonic anhydride, N-isovalerylaminoacetic acid, a catalyst, a dispersant, water, carbon fiber, alkyd resin, toluene, (E)-2-(5-chlorothiophene-2-yl)ethylenesulfonyl chloride and an initiator, wherein the catalyst is 4-dimethylaminopyridine, the dispersant is sodium dodecyl sulfonate and nonylphenol polyoxyethylene ether in a weight ratio of 2:1, and the initiator is tert-butyl peroxybenzoate. The content of each component is shown in Table 1 below.

[0069] The preparation method of the passivation solution is as follows: crotonic anhydride, N-isovalerylaminoacetic acid and a dispersant are stirred and mixed at 30° C. to obtain a mixed anhydride, and then sebacic acid amide and a catalyst are added, the temperature is raised to 40° C., and refluxed for 1 hour to obtain a condensate;

[0070] The carbon fiber, alkyd resin and toluene were mixed and ultrasonically dispersed at a power of 30 W for 15 minutes; then (E)-2-(5-chlorothiophen-2-yl)ethylenesulfonyl chloride and an initiator were added, the temperature was raised to 30° C., and the mixture was stirred for reaction for 2 hours to obtain a carbon fiber copolymer mixture;

[0071] The condensate, the carbon fiber copolymer mixture, oleyl hydroxyethyl imidazoline, citric acid, hydrogen peroxide and water were mixed and stirred for 50 minutes.

[0072] Example 5

[0073] This embodiment discloses an electroplating process, comprising the following steps:

[0074] S1. Pretreatment before plating: washing, degreasing and rust removal;

[0075] S2. Electroplating;

[0076] S3. Post-plating treatment; the workpiece after electroplating is post-treated with a passivation solution, the passivation temperature is 45°C, and the passivation time is 1.5h; then washed with water and dried at 65°C for 35min; the passivation solution includes the following components: hydrogen peroxide, citric acid, oleyl hydroxyethyl imidazoline, sebacic acid amide, crotonic anhydride, N-isovalerylaminoacetic acid, a catalyst, a dispersant, water, carbon fiber, alkyd resin, toluene, (E)-2-(5-chlorothiophene-2-yl)ethylenesulfonyl chloride and an initiator, wherein the catalyst is 4-dimethylaminopyridine, the dispersant is sodium dodecyl sulfonate and nonylphenol polyoxyethylene ether in a weight ratio of 2:1, and the initiator is tert-butyl peroxybenzoate. The content of each component is shown in Table 1 below.

[0077] The preparation method of the passivation solution is as follows: crotonic anhydride, N-isovalerylaminoacetic acid and a dispersant are stirred and mixed at 35° C. to obtain a mixed anhydride, and then sebacic acid amide and a catalyst are added, the temperature is raised to 50° C., and refluxed for 2 hours to obtain a condensation product;

[0078] The carbon fiber, alkyd resin and toluene were mixed and ultrasonically dispersed at a power of 50 W for 20 minutes; then (E)-2-(5-chlorothiophen-2-yl)ethylenesulfonyl chloride and an initiator were added, the temperature was raised to 40°C, and the reaction was stirred for 3 hours to obtain a carbon fiber copolymer mixture;

[0079] The condensate, the carbon fiber copolymer mixture, oleyl hydroxyethyl imidazoline, citric acid, hydrogen peroxide and water were mixed and stirred for 60 minutes.

[0080] Example 6

[0081] This embodiment discloses an electroplating process, comprising the following steps:

[0082] S1. Pretreatment before plating: washing, degreasing and rust removal;

[0083] S2. Electroplating;

[0084] S3. Post-plating treatment; the workpiece after electroplating is post-treated with a passivation solution, the passivation temperature is 42°C, and the passivation time is 1.2h; then washed with water and dried at 60°C for 33min; the passivation solution includes the following components: hydrogen peroxide, citric acid, oleyl hydroxyethyl imidazoline, sebacic acid amide, crotonic anhydride, N-isovalerylaminoacetic acid, a catalyst, a dispersant, water, carbon fiber, alkyd resin, toluene, (E)-2-(5-chlorothiophene-2-yl)ethylenesulfonyl chloride and an initiator, wherein the catalyst is 4-dimethylaminopyridine, the dispersant is sodium dodecyl sulfonate and nonylphenol polyoxyethylene ether in a weight ratio of 2:1, and the initiator is tert-butyl peroxybenzoate. The content of each component is shown in Table 1 below.

[0085] The preparation method of the passivation solution is as follows: crotonic anhydride, N-isovalerylaminoacetic acid and a dispersant are stirred and mixed at 33° C. to obtain a mixed anhydride, and then sebacic acid amide and a catalyst are added, the temperature is raised to 45° C., and refluxed for 1.5 hours to obtain a condensate;

[0086] The carbon fiber, alkyd resin and toluene were mixed and ultrasonically dispersed at a power of 40 W for 18 minutes; then (E)-2-(5-chlorothiophene-2-yl)ethylenesulfonyl chloride and an initiator were added, the temperature was raised to 35°C, and the reaction was stirred for 2.5 hours to obtain a carbon fiber copolymer mixture;

[0087] The condensate, the carbon fiber copolymer mixture, oleyl hydroxyethyl imidazoline, citric acid, hydrogen peroxide and water were mixed and stirred for 55 minutes.

[0088] Example 7

[0089] The difference from Example 1 is that the components of the passivation solution also include carbon fiber, alkyd resin and toluene, and the content of each component is shown in Table 2 below.

[0090] Example 8

[0091] The difference from Example 7 is that no carbon fiber is added. The contents of each component are shown in Table 2 below.

[0092] Example 9

[0093] The difference from Example 7 is that the alkyd resin is replaced by ethyl acetate. The contents of each component are shown in Table 2 below.

[0094] Example 10

[0095] The difference from Example 4 is that (E)-2-(5-chlorothiophen-2-yl)ethylenesulfonyl chloride is replaced by styrene. The contents of each component are shown in Table 2 below.

[0096] Embodiment 11

[0097] The difference from Example 10 is that the alkyd resin is replaced by ethyl acetate. The contents of each component are shown in Table 2 below.

[0098] Example 12

[0099] The difference from Example 4 is that the initiator is replaced by azobisisobutyronitrile.

[0100] Example 13

[0101] The difference from Example 1 is that the catalyst is replaced by aluminum chloride.

[0102] Embodiment 14

[0103] The difference from Example 1 is that the dispersant is sodium dodecyl sulfate.

[0104] Comparative Example

[0105] Comparative Example 1

[0106] The difference from Example 1 is that the components of the passivation solution are only 15 parts of hydrogen peroxide, 10 parts of citric acid and 80 parts of water.

[0107] Comparative Example 2

[0108] The difference from Example 1 is that oleyl hydroxyethyl imidazoline is replaced by sodium molybdate.

[0109] Comparative Example 3

[0110] The difference from Example 1 is that sebacic acid amide is replaced by triethylamine.

[0111] Comparative Example 4

[0112] The difference from Comparative Example 3 is that crotonic anhydride is replaced by methoxyacetic anhydride.

[0113] Comparative Example 5

[0114] The difference from Comparative Example 4 is that N-isovalerylaminoacetic acid is replaced by phenylacetic acid.

[0115] Table 1 Component contents of Examples 1-6

[0116] Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Hydrogen Peroxide 15 30 25 15 30 25 Citric Acid 10 20 15 10 20 15 Oleic acid hydroxyethyl imidazoline 8 12 10 8 12 10 Sebacic acid amide 6 8 7 6 8 7 Crotonic anhydride 1 2 2 1 2 2 N-Isovalerylaminoacetic acid 1 2 1 1 2 1 catalyst 1 2 1 1 2 1 Dispersants 5 6 6 5 6 6 water 80 100 90 80 100 90 Carbon Fiber / / / 0.4 0.6 0.5 Alkyd resin / / / 3 4 3 Toluene / / / 5 6 6 (E)-2-(5-Chlorothien-2-yl)ethylenesulfonyl chloride / / / 1 2 1 Initiator / / / 0.4 0.6 0.5

[0117] Table 2 Component contents of Examples 7-11

[0118] Example 7 Example 8 Example 9 Example 10 Embodiment 11 Hydrogen Peroxide 15 15 15 15 15 Citric Acid 10 10 10 10 10 Oleic acid hydroxyethyl imidazoline 8 8 8 8 8 Sebacic acid amide 6 6 6 6 6 Crotonic anhydride 1 1 1 1 1 N-Isovalerylaminoacetic acid 1 1 1 1 1 catalyst 1 1 1 1 1 Dispersants 5 5 5 5 5 water 80 80 80 80 80 Carbon Fiber 0.4 / 0.4 0.4 0.4 Alkyd resin / ethyl acetate 3 3 3 3 3 Toluene 5 5 5 5 5 (E)-2-(5-Chlorothien-2-yl)ethylenesulfonyl chloride / styrene / / / 1 1 Initiator / / / 0.4 0.4

[0119] Performance testing

[0120] Test method: Use a solution with a concentration of (5±0.1)% NaCl, a temperature of 50°C, a humidity of 95%, continuous spraying, and a test time of 48h; use the average corrosion rate to characterize the corrosion resistance, and weigh the mass of the specimen on an analytical balance, m0 before the experiment and m after the corrosion test. The average corrosion rate = [(m0-m) / m0] × 100%. The smaller the average corrosion rate, the better the corrosion resistance. The test results are shown in Table 3 below.

[0121] Table 3 Performance test results of various embodiments and comparative examples

[0122] Average corrosion rate / % Example 1 1.16 Example 2 1.02 Example 3 1.09 Example 4 0.41 Example 5 0.26 Example 6 0.34 Example 7 0.76 Example 8 1.03 Example 9 0.91 Example 10 0.75 Embodiment 11 0.86 Example 12 0.44 Example 13 1.25 Embodiment 14 1.20 Comparative Example 1 3.74 Comparative Example 2 1.65 Comparative Example 3 1.56 Comparative Example 4 1.78 Comparative Example 5 2.04

[0123] This specific implementation is merely an explanation of the present application and is not intended to limit the scope of protection of the present application. After reading this specification, those skilled in the art may make modifications to the present implementation as needed without any creative contribution, but as long as it is within the scope of the claims of the present application, it shall be protected by the patent law.

Claims

1. An electroplating process, characterized in that: The steps include: S1. Pretreatment before plating: washing, degreasing and rust removal; S2. Electroplating; S3. Post-plating treatment; post-treatment of the electroplated workpiece with a passivation solution, the passivation temperature is 40-45 ° C, the passivation time is 1-1.5h; then washed with water and dried at 60 ± 5 ° C for 30-35min; the passivation solution comprises the following components in parts by weight: 15-30 parts of hydrogen peroxide; 10-20 parts citric acid; 8-12 parts of oleyl hydroxyethyl imidazoline; 6-8 parts of sebacamide; 1-2 parts of crotonic anhydride; 1-2 parts of N-isovalerylaminoacetic acid; 1-2 parts of catalyst; 5-6 parts of dispersant; 80-100 parts water; 0.4-0.6 parts of carbon fiber; 3-4 parts alkyd resin; 5-6 parts of toluene; 1-2 parts of (E)-2-(5-chlorothiophen-2-yl)ethylenesulfonyl chloride; 0.4-0.6 parts of initiator; The catalyst is 4-dimethylaminopyridine; the dispersant is sodium dodecyl sulfate and nonylphenol polyoxyethylene ether in a weight ratio of 2:

1.

2. An electroplating process according to claim 1, characterized in that: The initiator is tert-butyl peroxybenzoate.

3. An electroplating process according to claim 1, characterized in that: The preparation method of the passivation solution is: mixing crotonic anhydride, N-isovalerylaminoacetic acid and a dispersant at 30-35° C. to obtain a mixed anhydride, then adding sebacic acid amide and a catalyst, heating to 40-50° C., and reflux reaction for 1-2 hours to obtain a condensate; The carbon fiber, alkyd resin and toluene are mixed and ultrasonically dispersed at a power of 30-50W for 15-20min; then (E)-2-(5-chlorothiophen-2-yl)ethylenesulfonyl chloride and an initiator are added, the temperature is raised to 30-40°C, and the reaction is stirred for 2-3h to obtain a carbon fiber copolymer mixture; The condensate, the carbon fiber copolymer mixture, the oleyl hydroxyethyl imidazoline, the citric acid, the hydrogen peroxide and the water are mixed and stirred for 50-60 minutes.