A multi-layer nickel plating method for a material filter of a pneumatic plunger pump

Abstract

The application discloses a multilayer nickel plating method for a material filter of a pneumatic plunger pump, and the method is characterized in that: the multilayer nickel plating part of the material filter of the pneumatic plunger pump is subjected to a pretreatment process to ensure that the plating surface has a certain roughness, so that the adhesion of the plating layer can be effectively improved; after the pretreatment is completed, a copper pyrophosphate electroplating layer is used as a bottom plating layer, so that the adhesion of a subsequent plating layer can be effectively improved; a semi-bright nickel layer is selected as a corrosion-resistant layer, the purpose of which is to prevent corrosion of the base layer and ensure the adhesion of the subsequent plating layer; when the subsequent electroless nickel plating layer is plated, the semi-bright nickel layer has strong hydrogen evolution capacity, so that the electroless nickel plating layer has strong adhesion and high plating speed; a middle-high phosphorus electroless nickel plating layer is used as an upper corrosion-resistant layer, the middle-high phosphorus electroless nickel plating layer has strong corrosion resistance, high wear resistance and good plating surface flattening capacity.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of surface treatment, and particularly relates to a multi-layer nickel plating method for a material filter of a pneumatic plunger pump. BACKGROUND

[0002] Surface treatment technology has been widely used in the modification of workpiece surfaces. In industrial production, when a pneumatic plunger pump is used to transport corrosive or abrasive media such as acidic nickel-containing solutions, the filter is prone to corrosion and wear, which cannot meet the actual production requirements. There are problems such as high equipment maintenance frequency and introduction of metal impurities. The traditional single plating layer cannot meet the requirements of long-term stable operation and reduction of maintenance cost. SUMMARY

[0003] (1) The technical problem to be solved: In view of the problem that the filter of the pneumatic plunger pump is prone to corrosion and wear when it is used to transport corrosive or abrasive media such as nickel-containing solutions, which cannot meet the actual production requirements, the present application provides a multi-layer nickel plating method for a material filter of a pneumatic plunger pump to improve the corrosion resistance and abrasion resistance.

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

[0005] A multi-layer nickel plating method for a material filter of a pneumatic plunger pump, comprising sequentially performing a pre-plating treatment process and a multi-layer nickel plating process, wherein the pre-plating treatment process comprises sequentially polishing, polishing, ultrasonic oil removal, electrolytic oil removal, hot water washing, activation, water washing, and hanging, and the multi-layer nickel plating process comprises sequentially copper base layer electroplating with copper pyrophosphate, water washing, hydrochloric acid activation, water washing, electroplating of 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 base layer electroplating with copper pyrophosphate is copper sulfate 80-120 g / L, potassium pyrophosphate 220-340 g / L, and ammonia water 0.1-0.5 ml / L; and the plating solution pH is 8-10.

[0007] In the process of electroplating semi-bright nickel, first, a shock nickel layer is plated using a Watt nickel solution mainly containing nickel sulfamate, and the process formula is: nickel sulfamate 800-900 ml / L, nickel chloride hexahydrate 40-50 g / L, and boric acid 50-80 g / L; then, the process of electroplating semi-bright nickel is carried out, and the process formula is: nickel sulfate 263-375 g / L, nickel chloride hexahydrate 38-53 g / L, boric acid 26-50 g / L, main brightener 0.2-0.5 ml / L, softener 1-3 ml / L, potential agent 0.1-1 ml / L, and wetting agent 0.1-1 ml / L. The purpose of this is to make the bonding force between the semi-bright nickel layer and the bottom copper plating layer in the previous step stronger, so as to prevent delamination.

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

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

[0010] The method must include the above process flow and process formula, and the formula and process are self-created processes, which are mainly used for the modification method of the specific air-driven plunger pump material filter in the application, and cannot achieve the corrosion resistance and wear resistance performance requirements by changing the process parameter range and process flow.

[0011] Further technical solutions are that in the ultrasonic oil removal process before plating, the oil removal liquid temperature is 50-60 DEG C, the ultrasonic wave generator frequency is 20-30 HZ, the current density is 0.5-1 A / dm 2 .

[0012] Further technical solutions are that the thickness of the copper substrate layer of the cupric pyrophosphate electroplating is controlled to be 3-5 microns, the thickness of the semi-bright nickel layer of the middle layer is controlled to be 10-15 microns, and the total thickness of the upper layer of the medium-phosphorus electroless nickel layer and the high-phosphorus electroless nickel layer is controlled to be between 15-20 microns (the total thickness of the upper layer is still the single thickness)

[0013] Further technical solutions are that in the activation process before plating, the concentration of hydrochloric acid is 5%-10%.

[0014] Further technical solutions are that in the cupric pyrophosphate electroplating copper substrate layer process of the multi-layer nickel plating process, the plating liquid pH is 8-10, the plating temperature is 50-60 DEG C, and the plating time is 10-20 min.

[0015] Further technical solutions are that in the semi-bright nickel electroplating process of the multi-layer nickel plating process, the impact nickel layer current density is 3-4 A / dm 2 , the plating temperature is 40-45 DEG C, the plating time is 20-40 s, and the plating liquid pH is 3.5-3.8.

[0016] Further technical solutions are that in the semi-bright nickel electroplating process of the multi-layer nickel plating process, the plating liquid pH is 3.5-3.8, the current density is 2.1-2.8 A / dm 2 , the plating temperature is 40-45 DEG C, and the plating time is 30-50 min.

[0017] Further technical solutions are that in the middle phosphorus chemical nickel plating process of the multi-layer nickel plating procedure, the plating solution pH is 4.6-4.8, the plating temperature is 85-88 DEG C, and the plating time is 60-80 min.

[0018] Further technical solutions are 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 DEG C, the plating time is 20-30 min, and the solution pH is adjusted by using 1:1 concentration ammonia water.

[0019] Further technical solutions are that in the heat treatment process of the multi-layer nickel plating procedure, the oven temperature is 300-400 DEG C, and the heat treatment time is 100-120 / min.

[0020] (3) Since the above technical solutions are adopted, the beneficial effects of the present application are:

[0021] Since the material of the pneumatic plunger pump material filter is 316L stainless steel, when conveying acid nickel powder solution and other corrosion-resistant and abrasive materials in industrial production, the filter is easy to be corroded and worn. When the filter is damaged, there are problems such as liquid mixing and metal ion impurities introduced during material conveying. In view of the above problems, the principle of the multi-layer nickel plating of the pneumatic plunger pump material filter is as follows: the plating part is subjected to a pretreatment process to ensure that the plating surface has a certain roughness, which can effectively improve the adhesion of the plating layer. After the pretreatment is completed, a copper pyrophosphate plating layer is used as a bottom layer plating layer, which can effectively improve the adhesion of the subsequent plating layer. The corrosion-resistant layer is selected to be a semi-bright nickel layer, which aims to prevent corrosion of the base layer and ensure the adhesion of the subsequent plating layer. When the subsequent chemical nickel plating layer is plated, the semi-bright nickel layer has strong hydrogen evolution ability, which can make the chemical nickel plating layer have strong adhesion and high plating speed. The upper corrosion-resistant layer uses a medium and high phosphorus chemical nickel plating layer, which has strong corrosion resistance, high wear resistance and good plating surface leveling ability.

[0022] Compared with single-layer nickel plating, the multi-layer nickel plating of the pneumatic plunger pump material filter listed in the present application can improve the overall performance of the filter and prolong its service life by depositing multiple layers of nickel alloy with different properties on the surface of the base material. This design not only improves the overall performance of the filter, but also reduces the frequency of replacement due to corrosion or wear, thereby having significant advantages in industrial applications. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present application more clear and explicit, the present application will be further described in detail below with examples.

[0024] Example 1:

[0025] A multi-layer nickel plating method for a pneumatic plunger pump material filter, comprising sequentially performing a pre-plating treatment process and a multi-layer nickel plating process, wherein the pre-plating treatment process comprises sequentially polishing, polishing, ultrasonic oil removal, electrolytic oil removal, hot water washing, activation, water washing, and hanging, and the multi-layer nickel plating process comprises sequentially copper base layer electroplating with cupric pyrophosphate, water washing, hydrochloric acid activation, water washing, semi-bright nickel electroplating, 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, and specifically

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

[0027] 2. After ultrasonic oil removal, electrolytic oil removal is performed at a temperature of 50℃ and a current density of 0.5A / dm2.

[0028] 3. After ultrasonic oil removal, hydrochloric acid activation is performed, the hydrochloric acid concentration is 5%, the activation time is 30s, copper sulfate 3200g, potassium pyrophosphate 8800g, and ammonia water 4ml are weighed, water is added to make up to 40L, the plating solution pH is adjusted to 8, the plating temperature is 50℃, and the plating time is 10min.

[0029] 4. Prepare the impact nickel plating solution, first add nickel sulfamate 32L, nickel chloride hexahydrate 1600g, boric acid 2000g, add water to make up to 40L, add ammonia water to adjust the plating solution pH to 3.5, after the plating solution is adjusted, filter and circulate for 3h, then electroplate, the impact nickel layer current density is 3A / dm 2 , the plating temperature is 40℃, and the plating time is 20s, after plating is completed, water washing is performed.

[0030] 5. Prepare the semi-bright nickel plating solution, first add nickel sulfate 10.52kg, nickel chloride hexahydrate 1520g, boric acid 1040g, main brightener 8ml, softener 40ml, potential agent 4ml, wetting agent 4ml, use pure water to make up to 40L, add ammonia water to adjust the plating solution pH to 3.5, set the current density to 2.1 / dm2, after the plating piece is washed, plating is performed, the plating temperature is 40℃, and the plating time is 30min. The main brightener is selected from DR-malic acid, the softener is selected from polyoxyethylene ether, the potential agent is selected from potassium sodium tartrate, and the wetting agent is selected from cetyltrimethylammonium bromide.

[0031] 6, using 5% hydrochloric acid activation semi-bright nickel plated parts 30 s, after activation water wash 15 s, configuration of the phosphorus electroless nickel plating solution, its process formula is: nickel sulfate 1000 g, sodium hypophosphite 600 g, lactic acid 400 g, citric acid 400 g, anhydrous sodium acetate 400 g, using pure water to constant volume to 40 L, stirring to completely dissolved, add 1:1 ammonia water to adjust the plating solution pH = 4.6, set the plating temperature 85 ℃, reach the preset temperature after plating, plating time 60 min. After plating complete water wash into the next process.

[0032] 7, configuration of high phosphorus electroless nickel plating solution, accurately take the nickel sulfate 1200 g, sodium dihydrogen phosphate 1200 g, lactic acid 400 ml, citric acid 800 g, sodium acetate trihydrate 400 g, using pure water to constant volume to 40 L, after stirring to completely dissolved adjust the plating solution pH = 4.8, plating temperature 90, plating time 20 min, after plating complete water wash, into the next process.

[0033] 8, set the oven temperature 300 ℃, reach the preset temperature after put into the workpiece, heat treatment 100 min after water wash, into the drying process to dry the plated parts, after drying hang detection of the coating wear resistance and corrosion resistance.

[0034] Example 2

[0035] 1, after polishing and polishing the filter, ultrasonic oil removal, set the ultrasonic frequency 25 HZ, set the oil removal temperature 55 ℃

[0036] 2, after ultrasonic oil removal into the electrolytic oil removal process, temperature 50 ℃, current density 0.6 A / dm 2 .

[0037] 3, ultrasonic oil removal into the hydrochloric acid activation process, hydrochloric acid concentration 5%, activation time 30 s; take the copper sulfate 3500 g, potassium pyrophosphate 9000 g, ammonia 5 ml, add water to constant volume to 40 L, adjust the plating solution pH = 8.2, plating temperature 50 ℃, plating time 10 min.

[0038] 4, configuration of impact nickel plating solution, first add nickel sulfamate 33 L, nickel chloride hexahydrate 1650 g, boric acid 2000 g, add water to constant volume to 40 L, add ammonia to adjust the plating solution pH = 3.6, after the plating solution adjustment, filter circulation 3 h start electroplating, impact nickel layer current density 3.5 A / dm 2 , plating temperature 42 ℃, plating time 20 s, after plating complete water wash.

[0039] 5. The semi-bright nickel plating solution is configured by adding 10.8 kg of nickel sulfate, 1600 g of nickel chloride hexahydrate, 1100 g of boric acid, 10 ml of DR-malic acid, 45 ml of polyoxyethylene ether, 5 ml of potassium sodium tartrate, and 5 ml of cetyltrimethylammonium bromide into 40 L of water, and adjusting the pH of the plating solution to 3.6 by adding ammonia water. The plating is performed at a current density of 2.2 A / dm2 after washing the workpiece with water, at a plating temperature of 42°C for 35 min.

[0040] 6. The semi-bright nickel plated workpiece is activated using 5% hydrochloric acid for 30 s, and then washed with water for 15 s. A medium phosphorus electroless nickel plating solution is configured by adding 1100 g of nickel sulfate, 650 g of sodium hypophosphite, 450 g of lactic acid, 450 g of citric acid, and 450 g of anhydrous sodium acetate into 40 L of water, and stirring until completely dissolved. The pH of the plating solution is adjusted to 4.7 by adding 1:1 ammonia water. The plating is performed at a temperature of 86°C for 65 min after reaching the preset temperature.

[0041] 7. A high phosphorus electroless nickel plating solution is configured by accurately measuring 1200 g of nickel sulfate, 1200 g of sodium dihydrogen phosphate, 400 ml of lactic acid, 800 g of citric acid, and 450 g of sodium acetate trihydrate, and adjusting the pH of the plating solution to 4.8 after stirring until completely dissolved. The plating is performed at a temperature of 91 for 25 min. After the plating is completed, the workpiece is washed and transferred to the next process.

[0042] 8. The temperature of the oven is set to 320°C. After reaching the preset temperature, the workpiece is placed in the oven and heat treated for 100 min. After washing, the workpiece is dried in the drying process. After drying, the wear resistance and corrosion resistance of the plated layer are detected.

[0043] Example 3

[0044] 1. After polishing and polishing the filter, ultrasonic oil removal is performed. The ultrasonic frequency is set to 25 Hz, and the oil removal temperature is set to 60°C.

[0045] 2. After ultrasonic oil removal, the temperature is 55°C, and the current density is 0.7 A / dm2. 2 .

[0046] 3. After ultrasonic oil removal, the hydrochloric acid activation process is performed. The concentration of hydrochloric acid is 5%, and the activation time is 30 s. 3600 g of copper sulfate and 9100 g of potassium pyrophosphate are weighed, 6 ml of ammonia water is added, and the volume is adjusted to 40 L with water. The pH of the plating solution is adjusted to 8.5, the plating temperature is 55°C, and the plating time is 15 min.

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

[0048] 5. Configure semi-bright nickel plating solution, first add nickel sulfate 11kg, nickel chloride hexahydrate 1700g, boric acid 1200g, main brightener 12ml, softener 50ml, potential agent 6ml, wetting agent 6ml, add water to 40L, add ammonia water to adjust the plating solution pH = 3.7, set the current density to 2.5A / dm 2 , after the plated part is washed with water, plating is performed, the plating temperature is 45℃, and the plating time is 40min.

[0049] 6. Activate the semi-bright nickel plated part using 5% hydrochloric acid for 30s, after activation is completed, water wash for 15s, configure medium phosphorus chemical nickel plating solution, the process formula is: nickel sulfate 1200g, sodium hypophosphite 650g, lactic acid 400g, citric acid 400g, anhydrous sodium acetate 500g, add water to 40L, stir until completely dissolved, add 1:1 ammonia water to adjust the plating solution pH = 4.8, set the plating temperature to 87℃, after reaching the preset temperature, plating is performed, the plating time is 70min. After plating is completed, water washing is performed and the next process is entered.

[0050] 7. Configure high-phosphorus chemical nickel plating solution, accurately weigh nickel sulfate 1200g, sodium dihydrogen phosphate 1200g, lactic acid 400ml, citric acid 800g, sodium acetate trihydrate 450g, add water to 40L, after stirring until completely dissolved, adjust the plating solution pH = 4.8, the plating temperature is 92℃, the plating time is 25min, after plating is completed, water washing is performed, and the next process is entered.

[0051] 8. Set the oven temperature to 350℃, after reaching the preset temperature, put the workpiece, heat treat for 100min, then water wash, enter the drying process to dry the plated part, after drying is completed, hang for detection of wear resistance and corrosion resistance of the plated layer.

[0052] Example 4

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

[0054] 2. After ultrasonic oil removal is completed, enter the electrolytic oil removal process, the temperature is 50℃, and the current density is 0.8A / dm 2 .

[0055] 3. The ultrasonic oil removal is completed and transferred to the hydrochloric acid activation process, the concentration of hydrochloric acid is 5%, and the activation time is 30s; 3500g of copper sulfate, 9000g of potassium pyrophosphate, 5ml of ammonia water, and water are added to make the volume 40L, the plating solution pH is adjusted to 9, the plating temperature is 60℃, and the plating time is 15min.

[0056] 4. The impact nickel plating solution is configured, 33L of nickel sulfamate, 1650g of nickel chloride hexahydrate, and 2000g of boric acid are added first, water is added to make the volume 40L, ammonia water is added to adjust the plating solution pH to 3.8, the plating solution is filtered and circulated for 3h after being adjusted, and then electroplating is started, the impact nickel layer current density is 4A / dm 2 , the plating temperature is 45℃, the plating time is 20s, and water washing is performed after plating is completed.

[0057] 5. The semi-bright nickel plating solution is configured, 10.8kg of nickel sulfate, 1600g of nickel chloride hexahydrate, 1100g of boric acid, 12ml of main brightener, 50ml of softener, 6ml of potential agent, and 6ml of wetting agent are added first, the volume is made 40L, ammonia water is added to adjust the plating solution pH to 3.8, the current density is set to 2.5A / dm 2 , the plating is performed after the plating piece is washed with water, the plating temperature is 45℃, and the plating time is 40min.

[0058] 6. The semi-bright nickel plating piece is activated with 10% hydrochloric acid for 30s, water washing is performed for 15s after activation is completed, the medium phosphorus electroless nickel plating solution is configured, the process formula is: 1100g of nickel sulfate, 650g of sodium hypophosphite, 450g of lactic acid, 450g of citric acid, 450g of anhydrous sodium acetate, the volume is made 40L, stirring is performed until complete dissolution, 1:1 ammonia water is added to adjust the plating solution pH to 4.8, the plating temperature is set to 88℃, the plating is performed after the preset temperature is reached, the plating time is 70min, and water washing is performed after plating is completed to transfer to the next process.

[0059] 7. The high-phosphorus electroless nickel plating solution is configured, 1200g of nickel sulfate, 1200g of sodium dihydrogen phosphate, 400ml of lactic acid, 800g of citric acid, and 450g of sodium acetate trihydrate are accurately weighed, the volume is made 40L, the plating solution pH is adjusted to 4.8 after stirring until complete dissolution, the plating temperature is 92℃, the plating time is 30min, water washing is performed after plating is completed, and the next process is transferred.

[0060] 8. The oven temperature is set to 400℃, the workpiece is placed after the preset temperature is reached, heat treatment is performed for 120min, water washing is performed, the plated piece is dried in the drying process, the wear resistance and corrosion resistance of the plated layer are detected after drying is completed.

[0061] Comparative Example

[0062] The material of the air-driven plunger pump material filter in the background art is 316L stainless steel, and the wear resistance and corrosion resistance test is performed.

[0063] Test results of examples and comparative examples

[0064] Table 1 - test results table

[0065]

[0066] It can be seen that, after the material of the pneumatic plunger pump material filter is treated by the multi-layer nickel plating technology, the corrosion resistance and hardness of the plating layer are significantly improved compared with the original spare parts, and the performance of the spare parts can be effectively improved.

[0067] The above is only a preferred embodiment of the present application.

Claims

1. A multi-layered nickel plating method for a material filter of a pneumatic piston pump, characterized by, The process comprises a pre-plating treatment process and a multi-layer nickel plating process, wherein the pre-plating treatment process comprises polishing, polishing, ultrasonic oil removal, electrolytic oil removal, hot water washing, activation, water washing and hanging, and the multi-layer nickel plating process comprises copper pyrophosphate electroplating copper base layer, water washing, hydrochloric acid activation, water washing, semi-bright nickel electroplating, 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 copper sulfate 80-120 g / L, potassium pyrophosphate 220-340 g / L and ammonia water 0.1-0.5 ml / L; the plating solution pH is 8-10. In the semi-bright nickel electroplating process, first, impact nickel layer is plated using nickel sulfamate as the main salt in the Watt nickel solution, and the process formula is: nickel sulfamate 800-900 ml / L, nickel chloride hexahydrate 40-50 g / L and boric acid 50-80 g / L; then, the semi-bright nickel electroplating process is carried out, and the process formula is: nickel sulfate 263-375 g / L, nickel chloride hexahydrate 38-53 g / L, boric acid 26-50 g / L, main brightener 0.2-0.5 ml / L, softener 1-3 ml / L, potential agent 0.1-1 ml / L and wetting agent 0.1-1 ml / L. In the medium phosphorus chemical nickel plating process, the process formula is: nickel sulfate 25-30 g / L, sodium hypophosphite 15-20 g / L, lactic acid 10-15 g / L, citric acid 10-15 g / L and anhydrous sodium acetate 10-15 g / L. In the high phosphorus chemical nickel plating process, the process formula is: nickel sulfate 30-35 g / L, sodium dihydrogen phosphate 30-35 g / L, lactic acid 10-15 ml / L, citric acid 20-25 ml / L and sodium acetate trihydrate 10-15 g / L. In the copper pyrophosphate electroplating copper base layer process of the multi-layer nickel plating process, the plating solution pH is 8-10, the plating temperature is 50-60 ℃, and the plating time is 10-20 min. In the electroplating semi-bright nickel process of the multi-layer nickel plating procedure, the impact nickel layer current density is 3-4 A / dm 2 , the plating temperature is 40-45℃, the plating time is 20-40s, and the plating solution pH is 3.5-3.8; In the electroplating semi-bright nickel process of the multi-layer nickel plating procedure, the plating solution pH is 3.5-3.8, the current density is 2.1-2.8 A / dm 2 , the plating temperature is 40-45℃, and the plating time is 30-50 min. In the medium phosphorus chemical nickel plating process of the multi-layer nickel plating process, the plating solution pH is 4.6-4.8, the plating temperature is 85-88 ℃, and the plating time is 60-80 min. In the high phosphorus chemical nickel plating process of the multi-layer nickel plating process, the plating solution pH is 4.8-5.0, the plating temperature is 90-92 ℃, the plating time is 20-30 min, and the solution pH is adjusted using 1:1 concentration ammonia water.

2. The multi-layered nickel plating method for a material filter of a pneumatic plunger pump according to claim 1, wherein: In the ultrasonic oil removing process before plating, the oil removing liquid temperature is 50-60℃, the ultrasonic generator frequency is 20-30HZ, and the current density is 0.5-1A / dm 2 .

3. The multi-layered nickel plating process for a pneumatic piston pump material filter according to claim 1, wherein: The thickness of the copper pyrophosphate electroplating copper base layer is controlled to be 3-5 microns, the thickness of the semi-bright nickel layer of the medium layer is controlled to be 10-15 microns, and the total thickness of the medium phosphorus chemical nickel layer and the high phosphorus chemical nickel layer of the upper layer is controlled to be 15-20 microns.

4. The multi-layered nickel plating process for a pneumatic piston pump material filter according to claim 1, wherein: In the activation process of the pre-plating treatment, the concentration of hydrochloric acid is 5%-10%.

5. The multi-layered nickel plating process for a pneumatic piston pump material filter according to claim 1, wherein: In the heat treatment process of the multi-layer nickel plating process, the oven temperature is 300-400 ℃, and the heat treatment time is 100-120 / min.

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