A process for electroless plating of Ni-Co-P alloy on high strength steel

Abstract

The application provides a chemical plating Ni-Co-P alloy process method suitable for high-strength steel, and comprises the following steps: surface finishing; degreasing treatment; pickling; surface adjustment; chemical plating of Ni-Co-P alloy; recovery; secondary countercurrent rinsing; water blowing, drying or hydrogen removal treatment on the plated workpiece; and closed treatment. The application solves the problems of poor self-catalytic ability of high-strength alloy steel for equipment, difficulty in plating, poor wear resistance of the chemical plating nickel-cobalt-phosphorus alloy layer and other problems. Meanwhile, the application solves the problems of high porosity and easy blistering of the commonly used alloy steel chemical plating nickel-cobalt-phosphorus layer. The application has the advantages of low plating temperature, fast deposition speed, strong plating solution stability, long plating solution service cycle, uniform, fine and bright plating layer, no lead and cadmium heavy metal ions in the plating solution, simple wastewater treatment, reduced environmental pollution risk, excellent comprehensive performance index of the plating layer, and meeting the requirements of corrosion resistance and wear resistance under long storage and severe conditions of equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electroless plating alloy on metal surface, in particular to a process for electroless plating Ni-Co-P alloy suitable for high-strength steel material. BACKGROUND

[0002] At present, the electroless plating nickel-phosphorus alloy process technology is widely used, and the plating layer is uniform, moderate wear resistance, good corrosion resistance, low porosity, simple process and other advantages. It has been widely used in energy, chemical industry, transportation, electronics, military and other fields. With the continuous development of electroless plating nickel-phosphorus alloy technology, the corrosion resistance of the existing electroless plating nickel-phosphorus alloy technology has been greatly improved, and the comprehensive quality has been greatly improved, but the hardness of the plating layer has been difficult to achieve a breakthrough, generally maintaining at 200-350 Hv, which is difficult to meet the requirements of equipment wear resistance.

[0003] Limited to the status quo of the hardness of the electroless nickel-phosphorus alloy plating layer being difficult to break through, surface technology personnel have researched nickel-boron alloy or nickel-boron-phosphorus alloy in order to realize the breakthrough of the hardness of the nickel-phosphorus alloy. Some studies have reported that the hardness of nickel-boron alloy reaches 600-700 Hv, but due to the high cost of electroless plating nickel-boron alloy, poor plating solution stability, and difficult process conditions, it has not been widely applied. Therefore, the electroless plating nickel-cobalt-phosphorus alloy process becomes the best choice.

[0004] At present, although there are many studies on electroless plating nickel-cobalt-phosphorus alloy technology, there are still problems such as low plating speed, unstable plating solution, large pH change during plating process, and poor adhesion of the plating layer. There are few reports on electroless plating nickel-cobalt-phosphorus alloy process technology suitable for high-strength alloy steel for military equipment. In addition, as a new emerging magnetic memory material, nickel-cobalt-phosphorus alloy plating layer has attracted widespread attention. This alloy plating layer has the advantages of nickel-phosphorus alloy and cobalt-phosphorus alloy, has high coercivity, small residual magnetism and excellent electromagnetic conversion performance, and can reduce noise. The magnetic disk made of nickel-cobalt-phosphorus alloy plating layer has large wire density, high film hardness and good wear resistance, which not only provides the possibility for the small size and large capacity of the magnetic disk, but also increases its service life. The preparation of magnetic thin film can adopt gas deposition, electroplating and electroless plating. Compared with the former two methods, electroless plating has the advantages of low cost, high efficiency, uniform plating layer, and easy operation and low investment, so it has become a research hotspot in recent years.

[0005] For the military industry, commonly used 35CrMnSiA, 4Cr5MoSiV1, 45CrNiMo1VA alloy steel material, due to obtain a certain special purpose, usually requires its Rockwell hardness above 40HRC after heat treatment. First, these alloy materials contain Cr, Mn, Si, B, Mo, V and other low activity elements, which have no catalytic ability to hypophosphite, and it is difficult to deposit the coating, even if it can be deposited, the adhesion is poor; second, the material organization has a great influence on the quality of chemical deposition. Research shows that different hardness intervals correspond to different organizations, such as 25-30HRC, the organization is sorbite and network ferrite, 32-38HRC, the organization is tempered sorbite, 40-48HRC, the organization is martensite and a small amount of ferrite (tempered troostite), and when the hardness is greater than 50HRC, the organization is lamellar martensite and acicular martensite. Certain material organization is easy to passivate in high temperature bath, and it is difficult to form active initiation center, which will cause the plating difficulty, even if there is a coating, the coating adhesion is poor, the porosity is high, and the coating is easy to burst. SUMMARY

[0006] In view of the above problems, the purpose of the present application is to provide a chemical plating nickel-cobalt-phosphorus alloy process method which is easy to obtain, suitable for high-strength alloy steel, and can improve the corrosion resistance and wear resistance of the plated part. This process method is not only suitable for high-strength steel, but also suitable for ordinary steel.

[0007] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows: a chemical plating Ni-Co-P alloy process method suitable for high-strength steel, comprising the following steps:

[0008] (1) Surface finishing: the workpiece is trimmed to remove burrs, rust and marker traces;

[0009] (2) Degreasing treatment: the workpiece after surface finishing is subjected to degreasing treatment to remove cutting oil, rust-proof oil and grinding paste on the workpiece;

[0010] (3) Pickling: using an acidic activation treatment solution to erode the workpiece, so that the oxides on the surface of the workpiece are dissolved to expose the active metal interface;

[0011] (4) Surface adjustment: the workpiece after pickling is placed in a weak alkaline solution to neutralize the residual acid on the surface and form an activation center to induce coating deposition;

[0012] (5) Chemical plating of Ni-Co-P alloy: the workpiece after surface adjustment is placed in a prepared chemical plating nickel-cobalt-phosphorus plating solution for 40-70 minutes, and the workpiece is hung by an insulating hanger; the filter device and the stirring device are turned on, and the nickel-cobalt-phosphorus coating is deposited on the workpiece;

[0013] The construction conditions of the plating solution are as follows: the temperature is 72-82℃, and the pH value is 6.2-6.8.

[0014] The composition of the plating solution is: nickel salt 8-15 g / L, cobalt salt 6-12 g / L, hypophosphite 15-30 g / L, tartrate 20-50 g / L, citrate 10-25 g / L, ammonium salt 10-25 g / L, accelerator 5 g / L, adjusting agent 5 ml / L, composite stabilizer 100-200 ppm, wetting agent 50-100 ppm; the loading capacity is 1-2 dm 2 / L;

[0015] (6) Recovery: recover the plating solution for reuse;

[0016] (7) Secondary countercurrent rinsing: clean the adhesion of the reagent on the surface of the workpiece to improve the quality of the workpiece coating;

[0017] (8) Blow water, dry or hydrogen removal treatment on the plated workpiece;

[0018] (9) Closed treatment to improve the corrosion resistance of the coating;

[0019] The acidic activation treatment solution is a mixture of 1:1 dilute hydrochloric acid and hexamethylenetetramine; the nickel salt is nickel sulfate, the cobalt salt is cobalt acetate, the hypophosphite is sodium hypophosphite, the tartrate is potassium sodium tartrate, the citrate is sodium citrate or ammonium citrate, the ammonium salt is ammonium chloride, and the accelerator is a mixture of ZS with a concentration of 3 g / L and ammonium fluoride with a concentration of 2 g / L;

[0020] The adjusting agent is triethanolamine or triisopropanolamine.

[0021] Further, the composite stabilizer is compounded by iodide and urea, and the mass ratio of the two is 50:1.

[0022] The plating solution is prepared by the following steps:

[0023] 1) Calculate the volume of the plating tank to be prepared, then add one-third volume of deionized water;

[0024] 2) Calculate the amount of medicine according to 5 times concentrated solution, add nickel salt and cobalt salt in No. 1 container, stir to dissolve, then add accelerator and adjusting agent, stir for 28-35 minutes;

[0025] 3) Calculate the amount of hypophosphite according to 5 times concentrated solution in No. 2 container, stir to dissolve, then add composite stabilizer and stir until completely dissolved;

[0026] 4) Calculate the amount of tartrate, citrate and ammonium salt according to 5 times concentrated solution in No. 3 container, stir until completely dissolved;

[0027] 5) Mix, stir, and add deionized water to No. 1, No. 2, and No. 3 solutions, then add a composite stabilizer and a wetting agent and stir until completely dissolved, and then adjust the pH value to 6.2-6.8 with sulfuric acid and ammonia.

[0028] The wetting agent is sodium dodecyl sulfate, and the content is controlled at 50-100 ppm.

[0029] A high-strength alloy steel Ni-Co-P alloy plated part is prepared by immersing a part in the plating solution prepared by the above process to form a plating layer.

[0030] Compared with the prior art, the present application has the advantages that the high-strength alloy steel is difficult to be plated, the deposition speed is slow, the plating layer has high porosity, the plating layer is easy to peel, the plating layer has low hardness, and is not resistant to wear, and the like, and the special requirements of the product are met.

[0031] There are not many mature processes for electroless plating of Ni-Co-P alloy, and the present application finds a reagent that is easy to reduce the activation energy and improve the self-catalytic ability of the high-strength alloy steel commonly used in the military industry by analyzing the structure of the high-strength alloy steel with different hardness (mechanical properties), and the reagent is further optimized by orthogonal experiment and screening of components, and a process for electroless plating of Ni-Co-P alloy suitable for high-strength alloy steel is obtained, which has fast chemical deposition speed, low plating solution temperature, and strong stability. The bath temperature of the present application is reduced from about 90 DEG C in the traditional process to about 75 DEG C, which not only saves energy but also reduces the volatilization of the bath, the harm to the operator, and environmental pollution; the bath life of the present application is greater than 13 cycles, the plating speed is up to 25 μm / h in the first cycle, and is still 8 μm / h in the 13th cycle; and the average plating speed is 15 μm / h.

[0032] Strong bath stability: the composite stabilizer selected through a large number of experiments can greatly prolong the service life of the bath, which not only saves chemicals but also reduces wastewater treatment costs, reduces environmental pollution, meets the requirements of clean production, saves energy, reduces environmental pollution caused by volatilization of the bath, reduces plating cost, improves bath stability, and is easy to operate on site.

[0033] Excellent plating layer quality: not only excellent corrosion resistance and high wear resistance of the plating layer meet the special functional requirements of military equipment parts, but also expand the application space of the electroless plating of Ni-Co-P alloy technology, which not only has wide economic and application value but also has important social significance. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a process flowchart of the present application. DETAILED DESCRIPTION

[0035] The technical scheme of the present application will be described clearly and completely in combination with the process flow and specific examples.

[0036] Referring to Figure 1 Fig. 1 shows a process method for electroless plating of Ni-Co-P alloy suitable for high-strength steel, which comprises the following steps:

[0037] (1) Surface finishing: the workpiece is trimmed to remove burrs, rust and marker traces; the workpiece surface is treated to be neat, so as to provide a basic condition for plating;

[0038] (2) Degreasing treatment: the workpiece after surface finishing is subjected to degreasing treatment to remove cutting oil, rust-proof oil and grinding paste on the workpiece;

[0039] (3) Pickling: the workpiece is eroded by using an acidic activation treatment solution, so that the oxides on the surface of the workpiece are dissolved to expose the active metal interface;

[0040] (4) Surface adjustment: the workpiece after pickling is placed in a weak alkaline solution to neutralize the residual acid on the surface and form an activation center to induce deposition of the plating layer;

[0041] (5) Electroless plating of Ni-Co-P alloy: the workpiece after surface adjustment is placed in the prepared electroless plating nickel-cobalt-phosphorus plating solution for 40-70 minutes, and the workpiece is hung by an insulating hanger; the filter device and the stirring device are turned on, and the nickel-cobalt-phosphorus plating layer is deposited on the workpiece;

[0042] The construction conditions of the plating solution are as follows: the temperature is 72-82℃, and the pH value is 6.2-6.8;

[0043] The composition of the plating solution is as follows: nickel salt 8-15 g / L, cobalt salt 6-12 g / L, hypophosphite 15-30 g / L, tartrate 20-50 g / L, citrate 10-25 g / L, ammonium salt 10-25 g / L, promoter 5 g / L, adjusting agent 5 ml / L, composite stabilizer 100-200 ppm, wetting agent 50-100 ppm; the loading capacity is 1-2 dm 2 / L;

[0044] (6) Recovery: the plating solution is recovered for reuse; the recovered plating solution can be supplemented with the tank solution to reduce waste, and on the other hand, Ni 2+ is a kind of pollutant, and recovery can reduce the wastewater discharge and maximize the pollution to the environment;

[0045] (7) Secondary countercurrent rinsing: the medicament adhered to the surface of the workpiece is cleaned to improve the quality of the plating layer of the workpiece;

[0046] (8) Water blowing, drying or hydrogen removal treatment is performed on the workpiece after plating;

[0047] (9) Perform a sealing treatment to improve the corrosion resistance of the plating layer.

[0048] The acidic activation treatment solution is a mixture of 1:1 dilute hydrochloric acid and hexamethylenetetramine; the nickel salt is nickel sulfate, the cobalt salt is cobalt acetate, the hypophosphite salt is sodium hypophosphite, the tartrate salt is potassium sodium tartrate, the citrate salt is sodium citrate or ammonium citrate, the ammonium salt is ammonium chloride, and the accelerator is a mixture of ZS with a concentration of 3 g / L and ammonium fluoride with a concentration of 2 g / L.

[0049] The adjusting agent is triethanolamine or triisopropanolamine.

[0050] The composite stabilizer is compounded from iodide and urea, and the mass ratio of the two is 50:1.

[0051] The plating solution is prepared by the following steps:

[0052] 1) First, calculate the volume of the plating bath to be prepared, then add one-third of the volume of deionized water;

[0053] 2) Calculate the amount of medicine added according to 5 times the concentrated solution, add nickel salt and cobalt salt in No. 1 container, stir and dissolve, then add the accelerator and the adjusting agent in turn, and stir for 28-35 minutes;

[0054] 3) Calculate the amount of hypophosphite salt added in No. 2 container according to 5 times the concentrated solution, stir and dissolve, then add the composite stabilizer and stir until completely dissolved;

[0055] 4) Calculate the amount of tartrate salt, citrate salt and ammonium salt added in No. 3 container according to 5 times the concentrated solution, and stir until completely dissolved;

[0056] 5) Mix, stir, and add deionized water to No. 1, No. 2, and No. 3 solutions, then add the composite stabilizer and the wetting agent and stir until completely dissolved, and then adjust the pH value to 6.2-6.8 with sulfuric acid and ammonia.

[0057] The wetting agent is sodium dodecyl sulfate, and its content is controlled at 50-100 ppm. Adding a small amount of the above wetting agent (surfactant) into the electroless nickel plating solution can greatly reduce the surface tension and interfacial tension of the plating solution, thereby changing the system state, facilitating the escape of the gas generated by the reaction, reducing the pinholes of the plating layer, avoiding the plating layer spot and mottling phenomenon for workpieces with high thread or surface roughness, improving the plating layer quality, and experimentally showing different degrees of effect of improving the deposition speed.

[0058] A high-strength alloy steel Ni-Co-P alloy part is prepared by immersing a workpiece in the plating solution prepared by the above process to form a plating layer. Example

[0059] The chemical plating solution is composed of: nickel sulfate 15 g / L, cobalt acetate 6 g / L, sodium hypophosphite 22 g / L, tartrate 30 g / L, citrate 20 g / L, ammonium salt 15 g / L, promoter: ZS 3 g / L, ammonium fluoride 2 g / L, adjusting agent 5 ml / L, composite stabilizer 150 ppm, wetting agent 80 ppm;

[0060] The chemical plating solution is specifically prepared and the plating method is as follows:

[0061] 1) Calculate the volume of the plating bath to be prepared, then add one-third of the volume of deionized water.

[0062] 2) Add nickel salt and cobalt salt to No. 1 container, stir to dissolve, then add promoter and adjusting agent in sequence, and stir for 30 minutes.

[0063] 3) Add calculated sodium hypophosphite to No. 2 container, stir to dissolve, then add stabilizer and stir until completely dissolved.

[0064] 4) Add calculated tartrate, citrate and ammonium salt to No. 3 container, stir until completely dissolved.

[0065] 5) Mix No. 1, No. 2 and No. 3 solutions, stir, add deionized water, then add stabilizer and surfactant, stir until completely dissolved, and adjust pH value with sulfuric acid and ammonia.

[0066] 6) Control the bath pH value to be 6.3, the loading capacity to be 1 dm 2 / L, and the bath temperature to be 75°C, put the treated workpiece into the tank filled with the plating solution, place for 50 minutes, and open the filter device and stirring device to deposit nickel-cobalt-phosphorus plating layer on the workpiece. Example

[0067] The difference between Example 1 and Example 2 is that the chemical plating Ni-Co-P alloy plating solution is composed of: nickel sulfate 12 g / L, cobalt acetate 9 g / L, sodium hypophosphite 22 g / L, tartrate 30 g / L, citrate 20 g / L, ammonium salt 15 g / L, promoter: ZS 3 g / L, ammonium fluoride 2 g / L, adjusting agent 5 ml / L, composite stabilizer 150 ppm, wetting agent 80 ppm; pH 6.5, loading capacity 1 dm 2 / L, bath temperature 75°C, put the pretreated workpiece into the tank filled with the plating solution, place for 50 minutes, and open the filter device and stirring device to deposit nickel-cobalt-phosphorus plating layer on the workpiece, and the other process steps are the same. Example

[0068] The composition of the electroless Ni-Co-P alloy plating solution is different from that of Example 1: nickel sulfate 8 g / L, cobalt acetate 12 g / L, sodium hypophosphite 22 g / L, tartrate 30 g / L, citrate 20 g / L, ammonium salt 15 g / L, accelerator: ZS 3 g / L, ammonium fluoride 2 g / L, adjusting agent 5 ml / L, composite stabilizer 150 ppm, wetting agent 80 ppm; pH 6.5, loading capacity 1 dm 2 / L, bath temperature 75°C, the pretreated workpiece is placed in the bath filled with the electroless plating solution for 50 minutes, and the filter device and the stirring device are turned on to deposit the nickel-cobalt-phosphorus plating layer on the workpiece, and the other process steps are the same. Example

[0069] The composition of the electroless Ni-Co-P alloy plating solution is different from that of Example 1: nickel sulfate 8 g / L, cobalt acetate 12 g / L, sodium hypophosphite 22 g / L, tartrate 30 g / L, citrate 20 g / L, ammonium salt 15 g / L, accelerator: ZS 3 g / L, ammonium fluoride 2 g / L, adjusting agent 5 ml / L, composite stabilizer 150 ppm, wetting agent 80 ppm; pH 6.5, loading capacity 1 dm 2 / L, bath temperature 75°C, the pretreated workpiece is placed in the bath filled with the electroless plating solution for 50 minutes, and the filter device and the stirring device are turned on to deposit the nickel-cobalt-phosphorus plating layer on the workpiece, and the other process steps are the same.

[0070] Implementation effect

[0071] After the high-strength alloy steel for equipment is subjected to the above four processes and then electrolessly plated with nickel-cobalt-phosphorus alloy, performance tests are conducted:

[0072] 1) Thickness: The thickness is greater than 10 μm as measured by an X-ray instrument according to GB / T6463;

[0073] 2) Salt spray test: The salt spray test is conducted according to NSS in GB10125, and the coating of the four samples is evaluated according to GB6461 after the salt spray test for 48 h (standard value), and no corrosion product appears on the surface, and the coating reaches level nine after the salt spray test for 72 h;

[0074] 3) Bonding strength: The adhesion of the coating is tested according to one or more methods in GB5270, and reaches level one;

[0075] 4) Coating hardness: The average hardness value of the sample of Example 1 is 480 HV 0.2 , the average hardness value of the sample of Example 2 is 660 HV 0.2 , and the average hardness value of the sample of Example 3 is 870 HV 0.2The average hardness value of the sample of Example 4 is 720HV 0.2 With the increase of the relative content of the cobalt salt in the plating solution, the hardness of the plating layer is also increased, and the overall hardness is increased by more than 3 times compared with the hardness of the electroless nickel layer; the comprehensive test results meet the tactical index requirements.

[0076] The process method solves the following problems: 1) the self-catalytic ability of the high-strength alloy steel for equipment is poor, and it is difficult to be plated; 2) the wear resistance of the electroless nickel-cobalt-phosphorus alloy plating layer is poor; 3) the corrosion resistance of the high-strength alloy steel parts for equipment is solved, so that it does not discolor and rust under normal storage conditions in the whole life cycle, and does not affect the tactical performance index; 4) the high porosity and easy peeling of the commonly used alloy steel electroless nickel-cobalt-phosphorus plating layer is solved; 5) the plating solution has the advantages of low plating temperature, fast deposition speed, strong plating solution stability, long plating solution use cycle and the like; 6) the problem of restricting the standardization of scientific research products is solved, and the products are put into batch production as soon as possible to meet the national defense needs.

[0077] The plating layer is uniform, fine and bright; the plating solution does not contain heavy metal ions such as lead and cadmium, the wastewater treatment is simple, the environmental pollution risk is reduced, the comprehensive performance index of the plating layer is excellent, and the requirements of corrosion resistance and wear resistance under long storage and severe conditions of equipment are met.

[0078] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and the present application can have various changes and variations for those skilled in the art. Any modification, equivalent replacement, improvement and the like within the spirit and principle of the present application are included in the protection scope of the present application.

Claims

1. A chemical plating process for Ni-Co-P alloys suitable for high-strength steel, characterized in that: Includes the following steps: (1) Surface finishing: The workpiece is finished to remove burrs, rust and markings; (2) Degreasing treatment: Degreasing treatment is performed on the workpiece after surface finishing to remove cutting grease, rust-preventive oil and grinding paste from the workpiece; (3) Pickling: Using an acidic activation treatment solution to erode the workpiece, dissolving the oxides on the workpiece surface and exposing the active metal interface; (4) Surface conditioning: The pickled workpiece is placed in a weak alkaline solution to neutralize the residual acid on the surface and form activation centers to induce coating deposition. (5) Electroless plating of Ni-Co-P alloy: Place the surface-adjusted workpiece into the prepared electroless nickel-cobalt-phosphorus plating solution for 40-70 minutes. The workpiece is suspended with an insulating hanger. Turn on the filter and stirring device to deposit a nickel-cobalt-phosphorus plating layer on the workpiece. The plating solution has the following application conditions: temperature 72-82℃, pH value 6.2-6.8; The plating solution comprises: nickel salt 8-15 g / L, cobalt salt 6-12 g / L, hypophosphite 15-30 g / L, tartrate 20-50 g / L, citrate 10-25 g / L, ammonium salt 10-25 g / L, accelerator 5 g / L, modifier 5 ml / L, composite stabilizer 100-200 ppm, and wetting agent 50-100 ppm; the loading rate is 1-2 dm³. 2 / L; (6) Recycling: Recycle the plating solution for reuse; (7) Secondary countercurrent rinsing: Cleans away the chemicals adhering to the surface of the workpiece to improve the quality of the workpiece coating; (8) Blow water, dry or remove hydrogen from the plated workpiece; (9) Perform a sealing treatment to improve the corrosion resistance of the coating; The acidic activation treatment solution is a 1:1 mixture of dilute hydrochloric acid and hexamethylenetetramine; the nickel salt is nickel sulfate, the cobalt salt is cobalt acetate, the hypophosphite is sodium hypophosphite, the tartrate is potassium sodium tartrate, the citrate is sodium citrate or ammonium citrate, the ammonium salt is ammonium chloride, and the accelerator is a mixture of 3 g / L ZS and 2 g / L ammonium fluoride; The modifier is triethanolamine or triisopropanolamine.

2. The chemical plating process for Ni-Co-P alloys suitable for high-strength steel according to claim 1, characterized in that: The composite stabilizer is composed of two substances, iodide and urea, in a mass ratio of 50:

1.

3. The chemical plating process for Ni-Co-P alloys suitable for high-strength steel according to claim 1, characterized in that: The plating solution is applied through the following steps: 1) First calculate the volume of the plating tank to be prepared, then add one-third of the volume of deionized water; 2) Calculate the amount of medicine to be added based on 5 times the concentration. Add nickel salt and cobalt salt to container No. 1 and stir to dissolve. Then add the accelerator and adjuster in sequence and stir for 28-35 minutes. 3) Add the calculated hypophosphite to container No. 2 according to the concentration of 5 times, stir to dissolve, and then add the composite stabilizer and stir until completely dissolved; 4) Add the calculated tartrate, citrate and ammonium salts to container No. 3 according to a 5-fold concentration, and stir until completely dissolved; 5) Mix solutions 1, 2, and 3, stir, add deionized water, then add composite stabilizer and wetting agent and stir until completely dissolved. Then adjust the pH value to 6.2-6.8 with sulfuric acid and ammonia.

4. The chemical plating process for Ni-Co-P alloys suitable for high-strength steel according to claim 3, characterized in that: The wetting agent is sodium dodecyl sulfate, and its content is controlled at 50-100 ppm.

5. A high-strength alloy steel component plated with Ni-Co-P alloy, characterized in that: It is prepared by immersing in the plating solution obtained according to any one of claims 1 to 4 to form a plating layer.

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