Multi-layer nickel plating method for pneumatic plunger pump material filter

Abstract

The invention discloses a multi-layer nickel plating method for a pneumatic plunger pump material filter, which is characterized in that a plating surface of a multi-layer nickel-plated part of the pneumatic plunger pump material filter is ensured to have certain roughness through a pretreatment procedure, the binding force of a plating layer can be effectively improved, and a copper pyrophosphate electroplating layer is used as a bottom plating layer after the pretreatment is finished, so that the plating layer is not damaged. The corrosion-resistant layer is a semi-bright nickel layer which aims at preventing the substrate layer from being corroded and guaranteeing the binding force of the subsequent plating layer, and when the subsequent chemical nickel-plating plating layer is plated, the semi-bright nickel layer has high hydrogen evolution capacity, so that the chemical nickel-plating layer has high adhesive force and high plating speed; the upper corrosion-resistant layer is a medium-high-phosphorus chemical nickel-plated layer, and the medium-high-phosphorus chemical nickel-plated layer is high in corrosion resistance, high in wear resistance and good in plating surface leveling capacity.

Description

Technical Field

[0001] The invention belongs to the technical field of surface treatment, and in particular relates to a multi-layer nickel plating method for a material filter of a pneumatic plunger pump. Background Art

[0002] Surface treatment technology has been widely used in workpiece surface modification. In industrial production, when pneumatic plunger pumps transport corrosive or abrasive media such as acidic nickel-containing solutions, the filters are susceptible to corrosion and wear and cannot meet actual production needs. There are problems such as high frequency of equipment maintenance and introduction of metal impurities. Traditional single coatings cannot meet the needs of long-term stable operation and reduced maintenance costs. Summary of the invention

[0003] (1) Technical problem to be solved: When a pneumatic plunger pump filter is used to transport corrosive or abrasive media such as nickel-containing solutions, the filter is susceptible to corrosion and wear and cannot meet actual production needs. The present invention provides a multi-layer nickel plating method for a pneumatic plunger pump material filter to improve corrosion resistance and abrasion resistance.

[0004] (2) The technical solution adopted by the present invention is as follows:

[0005] A multi-layer nickel plating method for a material filter of a pneumatic plunger pump comprises a pre-plating treatment process and a multi-layer nickel plating process, wherein the pre-plating treatment process is grinding, polishing, ultrasonic degreasing, electrolytic degreasing, hot water washing, activation, water washing, and hanging, and the multi-layer nickel plating process is copper pyrophosphate electroplating copper base layer, water washing, hydrochloric acid activation, water washing, electroplating semi-bright nickel, water washing, hydrochloric acid activation, water washing, medium phosphorus chemical nickel plating, high phosphorus chemical nickel plating, water washing, heat treatment, water washing, and drying.

[0006] The process formula of the copper pyrophosphate electroplating copper base layer is 80-120 g / L of copper sulfate, 220-340 g / L of potassium pyrophosphate, and 0.1-0.5 ml / L of ammonia water; the plating solution pH is 8-10;

[0007] In the electroplating process of semi-bright nickel, firstly, a Watt nickel solution with nickel sulfamate as the main salt is used to plate an impact nickel layer, and the process formula is: 800-900 ml / L of nickel sulfamate, 40-50 g / L of nickel chloride hexahydrate, and 50-80 g / L of boric acid; then a semi-bright nickel electroplating process is carried out, and the process formula is: 263-375 g / L of nickel sulfate, 38-53 g / L of nickel chloride hexahydrate, 26-50 g / L of boric acid, 0.2-0.5 ml / L of main brightener, 1-3 ml / L of softener, 0.1-1 ml / L of potentiometer, and 0.1-1 ml / L of wetting agent; the purpose of this is to make the semi-bright nickel layer more strongly bonded to the bottom copper plating layer in the previous step to prevent delamination.

[0008] In the medium phosphorus chemical nickel plating process, the process formula is: 25-30 g / L nickel sulfate, 15-20 g / L sodium hypophosphite, 10-15 g / L lactic acid, 10-15 g / L citric acid, and 10-15 g / L anhydrous sodium acetate;

[0009] In the high-phosphorus chemical nickel plating process, the process formula is: 30-35 g / L nickel sulfate, 30-35 g / L sodium dihydrogen phosphate, 10-15 ml / L lactic acid, 20-25 ml / L citric acid, and 10-15 g / L sodium acetate trihydrate.

[0010] The method described in the present invention must include the above process flow and process formula. This formula and process are self-created processes, which are mainly used for the modification method of the specific pneumatic plunger pump material filter in the present invention. If the process parameter range and process flow are changed, the corrosion resistance and wear resistance requirements cannot be achieved.

[0011] A further technical solution is that in the ultrasonic degreasing process before plating, the degreasing liquid temperature is 50-60°C, the ultrasonic generator frequency is 20-30HZ, and the current density is 0.5-1A / dm 2 .

[0012] A further technical solution is that the thickness of the copper pyrophosphate electroplated copper base layer is controlled at 3-5 microns, the thickness of the semi-bright nickel layer in the middle layer is controlled at 10-15 microns, and the total thickness of the medium-phosphorus chemical nickel plating layer and the high-phosphorus chemical nickel plating layer in the upper layer is controlled between 15-20 microns (the total thickness of the upper layer is still the thickness of the individual layers).

[0013] A further technical solution is that in the activation process before plating, the concentration of hydrochloric acid is 5% to 10%.

[0014] A further technical solution is that in the copper pyrophosphate electroplating copper base layer process of the multi-layer nickel plating process, the pH of the plating solution is 8-10, the plating temperature is 50-60° C., and the plating time is 10-20 minutes.

[0015] A further technical solution is that during the electroplating of semi-bright nickel in the multi-layer nickel plating process, the current density of the nickel layer is 3-4A / dm 2 , plating temperature 40 ~ 45 ℃, plating time 20 ~ 40s, plating solution pH 3.5-3.8.

[0016] A further technical solution is that in the electroplating process of semi-bright nickel in the multi-layer nickel plating process, the pH of the plating solution is 3.5-3.8, and the current density is 2.1-2.8A / dm 2 , plating temperature 40 ~ 45 ℃, plating time 30 ~ 50min.

[0017] A further technical solution is that in the medium phosphorus chemical nickel plating process of the multi-layer nickel plating process, the pH of the plating solution is 4.6-4.8, the plating temperature is 85-88° C., and the plating time is 60-80 minutes.

[0018] A further technical solution is that in the high-phosphorus chemical nickel plating process of the multi-layer nickel plating procedure, the plating solution pH is 4.8-5.0, the plating temperature is 90-92°C, the plating time is 20-30 minutes, and 1:1 concentration ammonia water is used to adjust the solution pH.

[0019] A further technical solution is that during the heat treatment process of the multi-layer nickel plating step, the oven temperature is 300-400° C. and the heat treatment time is 100-120 min.

[0020] (3) Due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0021] Since the material filter of the pneumatic plunger pump is made of 316L stainless steel, when conveying corrosion-resistant and abrasive materials such as acidic nickel powder solution in industrial production, the filter is susceptible to corrosion and wear. When the filter is damaged, there are problems such as liquid cross-contamination and introduction of metal ion impurities in material conveying. In view of the above problems, the principle of multi-layer nickel plating for the material filter of the pneumatic plunger pump using the present invention is as follows: the plated part is ensured to have a certain roughness on the plating surface through a pre-treatment process, which can effectively improve the bonding strength of the plating layer. After the pre-treatment is completed, a pyrophosphate copper electroplating layer is used as the bottom plating layer, which can effectively improve the bonding strength of the subsequent plating layer. The corrosion-resistant layer uses a semi-bright nickel layer, the purpose of which is to prevent corrosion of the base layer and ensure the bonding strength of the subsequent plating layer. When the subsequent chemical nickel plating layer is plated, the semi-bright nickel layer has a strong hydrogen evolution ability, which can make the chemical nickel plating layer have a strong adhesion and a higher plating speed; the upper corrosion-resistant layer uses a medium- and high-phosphorus chemical nickel plating layer, and the medium- and high-phosphorus chemical nickel plating layer has strong corrosion resistance, high wear resistance, and good plating surface flatness.

[0022] Compared with single-layer nickel plating, the multi-layer nickel plating of the pneumatic plunger pump material filter listed in the patent of this invention deposits multiple layers of nickel alloys with different properties on the surface of the substrate. Each layer is optimized for specific performance requirements. The bottom layer enhances the bonding strength and corrosion resistance with the substrate, the middle layer provides a high hardness and wear-resistant coating, and the surface layer improves corrosion resistance. Such a design not only improves the overall performance of the filter, but also extends its service life and reduces frequent replacement due to corrosion or wear, thus having significant advantages in industrial applications. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments.

[0024] Embodiment 1:

[0025] A multi-layer nickel plating method for a pneumatic plunger pump material filter comprises a pre-plating treatment process and a multi-layer nickel plating process, wherein the pre-plating treatment process is grinding, polishing, ultrasonic degreasing, electrolytic degreasing, hot water washing, activation, water washing, and hanging, and the multi-layer nickel plating process is copper pyrophosphate electroplating copper base layer, water washing, hydrochloric acid activation, water washing, electroplating semi-bright nickel, water washing, hydrochloric acid activation, water washing, medium-phosphorus chemical nickel plating, high-phosphorus chemical nickel plating, water washing, heat treatment, water washing, and drying, specifically

[0026] 1. After the filter is polished, perform ultrasonic degreasing, set the ultrasonic frequency to 20HZ, and set the degreasing temperature to 50℃

[0027] 2. After the ultrasonic degreasing is completed, the electrolytic degreasing process is carried out, the temperature is 50℃, and the current density is 0.5A / dm2. Answer: Water washing is a routine step. By default, the water washing step must be carried out after the key steps such as degreasing and nickel plating are completed.

[0028] 3. After ultrasonic degreasing is completed, enter the hydrochloric acid activation process, the hydrochloric acid concentration is 5%, and the activation time is 30s; weigh 3200g of copper sulfate, 8800g of potassium pyrophosphate, 4ml of ammonia water, add water to make up to 40L, adjust the plating solution pH to 8, the plating temperature is 50℃, and the plating time is 10min.

[0029] 4. Prepare the impact nickel plating solution. First add 32L of nickel sulfamate, 1600g of nickel chloride hexahydrate, and 2000g of boric acid. Add water to make the volume 40L. Add ammonia water to adjust the pH of the plating solution to 3.5. After the plating solution is adjusted, filter and circulate for 3h before electroplating. The current density of the impact nickel layer is 3A / dm 2 The plating temperature is 40°C, the plating time is 20s, and water washing is performed after plating is completed.

[0030] 5. Prepare semi-bright nickel plating solution, first add 10.52kg nickel sulfate, 1520g nickel chloride hexahydrate, 1040g boric acid, 8ml primary brightener, 40ml softener, 4ml potentiometer, 4ml wetting agent, use pure water to make the volume 40L, add ammonia water to adjust the plating solution pH to 3.5, set the current density to 2.1 / dm2, wash the plated parts and then plate them, the plating temperature is 40℃, and the plating time is 30min. The primary brightener is DR-malic acid, the softener is polyoxyethylene ether, the potentiometer is potassium sodium tartrate, and the wetting agent is hexadecyl trimethylammonium bromide.

[0031] 6. Use 5% hydrochloric acid to activate the semi-bright nickel plated parts for 30 seconds, wash with water for 15 seconds after activation, prepare the medium phosphorus chemical nickel plating solution, the process formula is: 1000g nickel sulfate, 600g sodium hypophosphite, 400g lactic acid, 400g citric acid, 400g anhydrous sodium acetate, use pure water to make up to 40L, stir until completely dissolved, add 1:1 ammonia water to adjust the pH of the plating solution to 4.6, set the plating temperature to 85℃, and plate after reaching the preset temperature, the plating time is 60min. After plating, wash with water and transfer to the next process.

[0032] 7. Prepare high-phosphorus chemical nickel plating solution, accurately weigh 1200g nickel sulfate, 1200g sodium dihydrogen phosphate, 400ml lactic acid, 800g citric acid, and 400g sodium acetate trihydrate, use pure water to make up to 40L, stir until completely dissolved, adjust the plating solution pH to 4.8, the plating temperature to 90, the plating time to 20min, wash with water after plating is completed, and proceed to the next process.

[0033] 8. Set the oven temperature to 300℃, put the workpiece in after reaching the preset temperature, wash with water after heat treatment for 100 minutes, and then enter the drying process to dry the plated parts. After drying, hang them down to test the wear resistance and corrosion resistance of the coating.

[0034] Example 2

[0035] 1. After the filter is polished, perform ultrasonic degreasing, set the ultrasonic frequency to 25HZ, and set the degreasing temperature to 55℃

[0036] 2. After ultrasonic degreasing, the electrolytic degreasing process is started, the temperature is 50℃, the current density is 0.6A / dm 2 .

[0037] 3. After ultrasonic degreasing is completed, enter the hydrochloric acid activation process, the hydrochloric acid concentration is 5%, and the activation time is 30s; weigh 3500g of copper sulfate, 9000g of potassium pyrophosphate, 5ml of ammonia water, add water to make up to 40L, adjust the plating solution pH to 8.2, the plating temperature is 50℃, and the plating time is 10min.

[0038] 4. Prepare the impact nickel plating solution. First add 33L nickel sulfamate, 1650g nickel chloride hexahydrate, 2000g boric acid, add water to make the volume 40L, add ammonia water to adjust the plating solution pH to 3.6, after the plating solution is adjusted, filter and circulate for 3h before electroplating, the impact nickel layer current density is 3.5A / dm 2 The plating temperature is 42°C, the plating time is 20s, and water washing is performed after plating is completed.

[0039] 5. Prepare semi-bright nickel plating solution. First add 10.8kg nickel sulfate, 1600g nickel chloride hexahydrate, 1100g boric acid, 10ml DR-malic acid, 45ml polyoxyethylene ether, 5ml potassium sodium tartrate, and 5ml hexadecyltrimethylammonium bromide. Make up to 40L. Add ammonia water to adjust the pH value of the plating solution to 3.6. Set the current density to 2.2A / dm2. Wash the plated parts with water and then plate them. The plating temperature is 42°C and the plating time is 35min.

[0040] 6. Use 5% hydrochloric acid to activate the semi-bright nickel plated parts for 30 seconds, wash with water for 15 seconds after activation, prepare the medium phosphorus chemical nickel plating solution, and its process formula is: 1100g nickel sulfate, 650g sodium hypophosphite, 450g lactic acid, 450g citric acid, 450g anhydrous sodium acetate, dilute to 40L, stir until completely dissolved, add 1:1 ammonia water to adjust the pH of the plating solution to 4.7, set the plating temperature to 86℃, and plate after reaching the preset temperature. The plating time is 65min. After plating, wash with water and transfer to the next process.

[0041] 7. Prepare high-phosphorus chemical nickel plating solution, accurately weigh 1200g nickel sulfate, 1200g sodium dihydrogen phosphate, 400ml lactic acid, 800g citric acid, 450g sodium acetate trihydrate, adjust the volume to 40L, and adjust the plating solution pH to 4.8 after stirring until completely dissolved, the plating temperature is 91, the plating time is 25min, and after plating, wash with water and transfer to the next process.

[0042] 8. Set the oven temperature to 320℃, put the workpiece in after reaching the preset temperature, wash with water after heat treatment for 100 minutes, and then enter the drying process to dry the plated parts. After drying, hang them down to test the wear resistance and corrosion resistance of the coating.

[0043] Example 3

[0044] 1. After the filter is polished, perform ultrasonic degreasing, set the ultrasonic frequency to 25HZ, and set the degreasing temperature to 60℃

[0045] 2. After ultrasonic degreasing, the electrolytic degreasing process is started, with a temperature of 55°C and a current density of 0.7A / dm 2 .

[0046] 3. After ultrasonic degreasing is completed, enter the hydrochloric acid activation process, the hydrochloric acid concentration is 5%, and the activation time is 30s; weigh 3600g of copper sulfate, 9100g of potassium pyrophosphate, and 6ml of ammonia water, add water to make up to 40L, adjust the plating solution pH to 8.5, the plating temperature is 55°C, and the plating time is 15min.

[0047] 4. Prepare the impact nickel plating solution. First add 33L nickel sulfamate, 1700g nickel chloride hexahydrate, 2000g boric acid, add water to 40L, add ammonia water to adjust the pH of the plating solution to 3.6. After the plating solution is adjusted, filter and circulate for 3h before electroplating. The impact nickel layer current density is 4A / dm 2 The plating temperature is 45°C, the plating time is 30s, and water washing is performed after plating is completed.

[0048] 5. Prepare semi-bright nickel plating solution. First add 11kg nickel sulfate, 1700g nickel chloride hexahydrate, 1200g boric acid, 12ml primary brightener, 50ml softener, 6ml potentiometer, 6ml wetting agent, adjust the volume to 40L, add ammonia water to adjust the plating solution pH to 3.7, and set the current density to 2.5A / dm 2 The plated parts are washed with water and then plated at a temperature of 45°C for 40 minutes.

[0049] 6. Use 5% hydrochloric acid to activate the semi-bright nickel plated parts for 30 seconds, wash with water for 15 seconds after activation, prepare the medium phosphorus chemical nickel plating solution, the process formula is: 1200g nickel sulfate, 650g sodium hypophosphite, 400g lactic acid, 400g citric acid, 500g anhydrous sodium acetate, dilute to 40L, stir until completely dissolved, add 1:1 ammonia water to adjust the pH of the plating solution to 4.8, set the plating temperature to 87℃, and plate after reaching the preset temperature, the plating time is 70min. After plating, wash with water and transfer to the next process.

[0050] 7. Prepare high-phosphorus chemical nickel plating solution, accurately weigh 1200g nickel sulfate, 1200g sodium dihydrogen phosphate, 400ml lactic acid, 800g citric acid, 450g sodium acetate trihydrate, fix the volume to 40L, stir until completely dissolved, adjust the plating solution pH to 4.8, plating temperature to 92°C, plating time to 25min, wash with water after plating is completed, and proceed to the next process.

[0051] 8. Set the oven temperature to 350℃, put the workpiece in after reaching the preset temperature, wash with water after heat treatment for 100 minutes, and then enter the drying process to dry the plated parts. After drying, hang them down to test the wear resistance and corrosion resistance of the coating.

[0052] Example 4

[0053] 1. After the filter is polished, perform ultrasonic degreasing, set the ultrasonic frequency to 30HZ, and set the degreasing temperature to 60℃

[0054] 2. After ultrasonic degreasing, the electrolytic degreasing process is started, with a temperature of 50°C and a current density of 0.8A / dm 2 .

[0055] 3. After ultrasonic degreasing is completed, enter the hydrochloric acid activation process, the hydrochloric acid concentration is 5%, and the activation time is 30s; weigh 3500g of copper sulfate, 9000g of potassium pyrophosphate, 5ml of ammonia water, add water to make up to 40L, adjust the plating solution pH to 9, the plating temperature is 60℃, and the plating time is 15min.

[0056] 4. Prepare the impact nickel plating solution. First add 33L nickel sulfamate, 1650g nickel chloride hexahydrate, 2000g boric acid, add water to 40L, add ammonia water to adjust the pH of the plating solution to 3.8. After the plating solution is adjusted, filter and circulate for 3h before electroplating. The impact nickel layer current density is 4A / dm 2 The plating temperature is 45°C, the plating time is 20s, and water washing is performed after plating is completed.

[0057] 5. Prepare semi-bright nickel plating solution. First add 10.8kg nickel sulfate, 1600g nickel chloride hexahydrate, 1100g boric acid, 12ml primary brightener, 50ml softener, 6ml potentiometer, 6ml wetting agent, adjust the volume to 40L, add ammonia water to adjust the plating solution pH to 3.8, and set the current density to 2.5A / dm 2 The plated parts are washed with water and then plated at a temperature of 45°C for 40 minutes.

[0058] 6. Use 10% hydrochloric acid to activate the semi-bright nickel plated parts for 30 seconds, wash with water for 15 seconds after activation, prepare the medium phosphorus chemical nickel plating solution, the process formula is: nickel sulfate 1100g, sodium hypophosphite 650g, lactic acid 450g, citric acid 450g, anhydrous sodium acetate 450g, dilute to 40L, stir until completely dissolved, add 1:1 ammonia water to adjust the pH of the plating solution to 4.8, set the plating temperature to 88℃, and plate after reaching the preset temperature, the plating time is 70min. After plating, wash with water and transfer to the next process.

[0059] 7. Prepare high-phosphorus chemical nickel plating solution, accurately weigh 1200g nickel sulfate, 1200g sodium dihydrogen phosphate, 400ml lactic acid, 800g citric acid, 450g sodium acetate trihydrate, adjust the volume to 40L, and adjust the plating solution pH to 4.8 after stirring until completely dissolved, the plating temperature is 92°C, the plating time is 30min, and after plating, wash with water and proceed to the next process.

[0060] 8. Set the oven temperature to 400℃, put the workpiece in after reaching the preset temperature, wash with water after heat treatment for 120 minutes, and then enter the drying process to dry the plated parts. After drying, hang them down to test the wear resistance and corrosion resistance of the coating.

[0061] Comparative Example

[0062] The wear resistance and corrosion resistance of the pneumatic plunger pump material filter made of 316L stainless steel in the background technology was tested.

[0063] Test results of embodiments and comparative examples

[0064] Table 1 - Test results

[0065]

[0066] From this, it can be seen that after the embodiment of the present invention uses multi-layer nickel plating technology to treat the pneumatic plunger pump material filter made of 316L stainless steel, the corrosion resistance and hardness of the coating are significantly improved compared with the original spare parts, which can effectively improve the performance of the spare parts.

[0067] The above are only preferred embodiments of the present invention.

Claims

1. A multi-layer nickel plating method for a pneumatic plunger pump material filter, characterized in that: The method comprises the following steps: pre-plating treatment and multi-layer nickel plating, wherein the pre-plating treatment steps are grinding, polishing, ultrasonic degreasing, electrolytic degreasing, hot water washing, activation, water washing, and hanging, and the multi-layer nickel plating steps are copper pyrophosphate electroplating copper base layer, water washing, hydrochloric acid activation, water washing, electroplating semi-bright nickel, water washing, hydrochloric acid activation, water washing, medium-phosphorus chemical nickel plating, high-phosphorus chemical nickel plating, water washing, heat treatment, water washing, and drying. The process formula of the copper pyrophosphate electroplating copper base layer is 80-120 g / L of copper sulfate, 220-340 g / L of potassium pyrophosphate, and 0.1-0.5 ml / L of ammonia water; the plating solution pH is 8-10; In the electroplating process of semi-bright nickel, firstly, a Watt nickel solution with nickel sulfamate as the main salt is used to plate an impact nickel layer, and the process formula is: 800-900 ml / L of nickel sulfamate, 40-50 g / L of nickel chloride hexahydrate, and 50-80 g / L of boric acid; then, a semi-bright nickel electroplating process is performed, and the process formula is: 263-375 g / L of nickel sulfate, 38-53 g / L of nickel chloride hexahydrate, 26-50 g / L of boric acid, 0.2-0.5 ml / L of main brightener, 1-3 ml / L of softener, 0.1-1 ml / L of potentiometer, and 0.1-1 ml / L of wetting agent; In the medium phosphorus chemical nickel plating process, the process formula is: 25-30 g / L nickel sulfate, 15-20 g / L sodium hypophosphite, 10-15 g / L lactic acid, 10-15 g / L citric acid, and 10-15 g / L anhydrous sodium acetate; In the high-phosphorus chemical nickel plating process, the process formula is: 30-35 g / L nickel sulfate, 30-35 g / L sodium dihydrogen phosphate, 10-15 ml / L lactic acid, 20-25 ml / L citric acid, and 10-15 g / L sodium acetate trihydrate.

2. The multi-layer nickel plating method for a pneumatic plunger pump material filter according to claim 1, characterized in that: In the ultrasonic degreasing process before plating, the degreasing liquid temperature is 50-60°C, the ultrasonic generator frequency is 20-30HZ, and the current density is 0.5-1A / dm 2 .

3. The multi-layer nickel plating method for a pneumatic plunger pump material filter according to claim 1, characterized in that: The thickness of the copper pyrophosphate electroplated copper base layer is controlled at 3-5 microns, the thickness of the middle semi-bright nickel layer is controlled at 10-15 microns, and the total thickness of the upper medium-phosphorus chemical nickel plating layer and high-phosphorus chemical nickel plating layer is controlled between 15-20 microns.

4. The multi-layer nickel plating method for a pneumatic plunger pump material filter according to claim 1, characterized in that: In the above mentioned pre-plating activation process, the concentration of hydrochloric acid is 5% to 10%.

5. The multi-layer nickel plating method for a pneumatic plunger pump material filter according to claim 1, characterized in that: In the copper pyrophosphate electroplating copper base layer process of the multi-layer nickel plating process, the pH of the plating solution is 8-10, the plating temperature is 50-60° C., and the plating time is 10-20 min.

6. The multi-layer nickel plating method for a pneumatic plunger pump material filter according to claim 1, characterized in that: During the electroplating of semi-bright nickel in the multi-layer nickel plating process, the current density of the impact nickel layer is 3-4A / dm 2 , plating temperature 40 ~ 45 ℃, plating time 20 ~ 40s, plating solution pH 3.5-3.

8.

7. The multi-layer nickel plating method for a pneumatic plunger pump material filter according to claim 1, characterized in that: In the electroplating process of semi-bright nickel in the multi-layer nickel plating process, the pH of the plating solution is 3.5-3.8, and the current density is 2.1-2.8 A / dm 2 , plating temperature 40 ~ 45 ℃, plating time 30 ~ 50min.

8. The multi-layer nickel plating method for a pneumatic plunger pump material filter according to claim 1, characterized in that: In the medium phosphorus chemical nickel plating process of the multi-layer nickel plating process, the pH of the plating solution is 4.6-4.8, the plating temperature is 85-88° C., and the plating time is 60-80 min.

9. The multi-layer nickel plating method for a pneumatic plunger pump material filter according to claim 1, characterized in that: In the high-phosphorus chemical nickel plating process of the multi-layer nickel plating procedure, the pH of the plating solution is 4.8-5.0, the plating temperature is 90-92° C., the plating time is 20-30 min, and 1:1 concentration ammonia water is used to adjust the solution pH.

10. The multi-layer nickel plating method for a pneumatic plunger pump material filter according to claim 1, characterized in that: During the heat treatment process of the multi-layer nickel plating step, the oven temperature is 300-400° C., and the heat treatment time is 100-120 min.

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