Nickel plating method for crown spring

Abstract

The invention discloses a crown spring nickel plating method, and belongs to the technical field of crown spring nickel plating, and the crown spring nickel plating method comprises the following steps: S1, putting a to-be-plated part and a plating accompanying object steel ball into a roller together, then putting into a pure water tank for cleaning, then putting into an alkaline degreasing tank for ultrasonic cleaning, and finally putting into the pure water tank for cleaning; s2, putting the roller into a sulfuric acid concentration activation tank; s3, the roller is put into an electroplating nickel tank to be electroplated; s4, the roller electroplated with the bottom nickel is taken out and put into a pure water tank to be cleaned; s5, the roller in the previous step is put into a sulfuric acid concentration activation tank to be subjected to activation treatment, and nickel plating in the next step is facilitated; s6, putting the roller in the previous step into an electroplating semi-bright nickel bath for electroplating, wherein the thickness of a nickel layer is 7-11 microns at the moment; and S7, the roller is put into pure water to be cleaned for 28-32 S, then the roller is put into pure water to be subjected to ultrasonic cleaning for 58-65 S, after ultrasonic cleaning, the part is taken out to be cleaned, oil dirt is removed, and after blow-drying, the part is put into a drying oven to be dried at the temperature of 75-85 DEG C.

Description

Technical Field

[0001] This invention relates to the field of nickel plating technology for crown springs, and particularly to a method for nickel plating crown springs. Background Technology

[0002] In the manufacturing process of aluminum nitride heaters, the crown spring is an indispensable component. During the operation of the aluminum nitride heater, this component will conduct excess charge into the cavity and then be grounded for protection. Therefore, the result of nickel plating of the protective layer of this component will directly affect the use of the aluminum nitride heater. Thus, a nickel plating method for the crown spring is needed. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method for nickel plating a crown spring, wherein the crown spring is nickel plated to obtain a nickel plating layer with good adhesion, high hardness, wear resistance and corrosion resistance.

[0004] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0005] A method for nickel plating a crown spring, the method comprising the following steps:

[0006] S1: Place the workpiece to be plated and the steel balls to be plated together into the roller, wherein the diameter of the steel balls to be plated is 2-4 mm; place the roller into a pure water tank for cleaning for 20-60 seconds, then place the roller into an alkaline degreasing tank and ultrasonically clean for 80-110 seconds, then place the roller into a pure water tank for cleaning for 20-40 seconds. The water should be changed in time during cleaning to prevent the concentration of degreasing agent in the tank from being too high, which would cause the roller to carry the degreasing agent into the nickel plating tank and affect the subsequent electroplating; then place the roller into a pure water tank for ultrasonic cleaning for 50-70 seconds.

[0007] S2: Place the above roller into an activation tank with a sulfuric acid concentration of 4% to 5% for 12 to 18 seconds;

[0008] S3: Place the above-mentioned roller into a nickel plating bath with NiSO4·6H2O concentration of 240-280 g / L, NiCl2·6H2O concentration of 40-55 g / L, H3BO3 concentration of 40-55 g / L, pH of 4.3-4.5, and temperature of 44-48℃. Set the roller speed to 6 RPM and the plating time to 4500 s for plating. At this time, the base nickel thickness is 3-5 micrometers.

[0009] S4: Take out the roller with the base nickel plated and put it into a pure water tank for cleaning for 14-16 seconds, and then put the roller into a pure water tank for ultrasonic cleaning for 28-32 seconds.

[0010] S5: Place the roller from the previous step into an activation bath with a sulfuric acid concentration of 4% to 5% for activation treatment in preparation for the next step of nickel plating;

[0011] S6: Place the previous roller into a semi-bright nickel plating bath with NiSO4·6H2O concentration of 270-300 g / L, NiCl2·6H2O concentration of 50-65 g / L, H3BO3 concentration of 40-60 g / L, pH of 4.4-4.7, and temperature of 48-54℃. Set the roller speed to 8 RPM and the plating time to 6000 s for plating. At this time, the nickel layer thickness is 7-11 micrometers.

[0012] S7: Immerse the roller in pure water for 28-32 seconds, then immerse it in pure water for ultrasonic cleaning for 58-65 seconds. After ultrasonic cleaning, remove the parts for further cleaning to remove oil stains. After drying, place them in an oven at 75-85°C for drying.

[0013] Preferably, the sulfuric acid concentration activation tank in step S2 contains a mixture of 95L water and 5L sulfuric acid.

[0014] Preferably, the nickel plating method for the crown spring is barrel plating.

[0015] Preferably, in the nickel plating bath of step S3, the concentration of NiSO4·6H2O is 250-270 g / L, the concentration of NiCl2·6H2O is 45-50 g / L, the concentration of H3BO3 is 45-50 g / L, the temperature is 45-47°C, and the thickness of the base nickel after electroplating is 3.5-4.5 micrometers.

[0016] Preferably, in the semi-bright nickel plating bath of step S6, the concentration of NiSO4·6H2O is 280-290 g / L, the concentration of NiCl2·6H2O is 55-60 g / L, the concentration of H3BO3 is 45-55 g / L, the pH is 4.5-4.6, the temperature is 50-52℃, and the thickness of the nickel layer after electroplating is 8-10 micrometers.

[0017] The above technical solution has the following beneficial effects:

[0018] This application achieves a nickel plating layer with good adhesion, high hardness, wear resistance, and corrosion resistance by changing the concentration of each ion in the electroplating bath. Detailed Implementation

[0019] The specific embodiments of the present invention will be further described below. It should be noted that these descriptions are for the purpose of aiding understanding the present invention, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0020] In CVD chemical deposition processes, aluminum nitride heaters are commonly used to adsorb wafers for processing. The crown spring is an indispensable part of the aluminum nitride heater, and it plays a grounding role during the operation of the aluminum nitride heater. Therefore, the result of nickel plating on the protective layer of this part will directly affect the use of the aluminum nitride heater. Thus, a nickel plating method for the crown spring is needed to obtain a nickel plating layer with good adhesion, high hardness, wear resistance, and corrosion resistance.

[0021] To solve the above problems, a method for nickel plating a crown spring is provided, which includes the following steps:

[0022] S1: Place the workpiece to be plated and the steel balls to be plated together into the roller, wherein the diameter of the steel balls to be plated is 2-4 mm; place the roller into a pure water tank for cleaning for 20-60 seconds, then place the roller into an alkaline degreasing tank and ultrasonically clean for 80-110 seconds, then place the roller into a pure water tank for cleaning for 20-40 seconds. The water should be changed in time during cleaning to prevent the concentration of degreasing agent in the tank from being too high, which would cause the roller to carry the degreasing agent into the nickel plating tank and affect the subsequent electroplating; then place the roller into a pure water tank for ultrasonic cleaning for 50-70 seconds.

[0023] Specifically, the part to be plated and the steel balls to be plated are first placed into the drum. The part to be plated is the unplated crown spring, and the steel balls to be plated are spherical with a diameter of 2 mm, 4 mm, or 3 mm. The drum, the part to be plated, and the steel balls to be plated are first placed into a pure water tank for cleaning for 20 seconds, 60 seconds, or 40 seconds. Then, they are placed into an alkaline degreasing tank and ultrasonically cleaned for 80 seconds or 110 seconds. The ultrasonic cleaning time in the alkaline degreasing tank can also be 90 seconds or 100 seconds. After cleaning, it is cleaned in a pure water tank for 20 seconds, 40 seconds, or 30 seconds. Then, the drum is placed into a pure water tank for ultrasonic cleaning for 50 seconds, 70 seconds, or 60 seconds to complete the cleaning. During the cleaning process, the drum speed can be 6 RPM.

[0024] S2: Immerse the roller in an activation tank with a sulfuric acid concentration of 4% to 5% for 12 to 18 seconds. Specifically, after the above cleaning steps are completed, immerse the roller in an activation tank with a sulfuric acid concentration of 4% or 5% for 12 or 18 seconds. The sulfuric acid concentration in the activation tank can also be 4.5%, and the activation time can be 15 seconds. After activation, it is convenient to carry out the next step of nickel plating.

[0025] S3: Place the above-mentioned roller into a nickel plating bath with NiSO4·6H2O concentration of 240-280 g / L, NiCl2·6H2O concentration of 40-55 g / L, H3BO3 concentration of 40-55 g / L, pH of 4.3-4.5, and temperature of 44-48℃. Set the roller speed to 6 RPM and the plating time to 4500 s for plating. At this time, the base nickel thickness is 3-5 micrometers.

[0026] Specifically, after activation, the roller, along with the parts to be plated and the steel balls to be plated, is placed into the nickel plating bath. The concentration of NiSO4·6H2O in the electroplating solution of the nickel plating bath is 240-280 g / L, and can also be 250-270 g / L; the concentration of NiCl2·6H2O is 40-55 g / L, and can also be 45-50 g / L; the concentration of H3BO3 is 40-55 g / L, and can also be 45-50 g / L; the pH value of the electroplating solution in the nickel plating bath is between 4.3 and 4.5, and the temperature is between 44 and 48℃, specifically between 45 and 47℃.

[0027] S4: Take out the nickel-plated roller and put it into a pure water tank for cleaning for 14-16 seconds. Then put the roller into a pure water tank for ultrasonic cleaning for 28-32 seconds. Specifically, take the nickel-plated roller and crown spring out of the nickel plating tank and put them into a pure water tank for cleaning for 14 or 16 seconds. Then put them into a pure water tank for ultrasonic cleaning for 28 or 32 seconds. After cleaning, set aside.

[0028] S5: Place the roller from the previous step into an activation bath with a sulfuric acid concentration of 4% to 5% for activation treatment in order to proceed with the next nickel plating step. Specifically, after cleaning the base nickel plating, place it back into an activation bath with a sulfuric acid concentration of 4% to 5% for activation treatment in order to proceed with the nickel plating again.

[0029] S6: Place the previous roller into a semi-bright nickel plating bath with NiSO4·6H2O concentration of 270-300 g / L, NiCl2·6H2O concentration of 50-65 g / L, H3BO3 concentration of 40-60 g / L, pH of 4.4-4.7, and temperature of 48-54℃. Set the roller speed to 8 RPM and the plating time to 6000 s for plating. At this time, the nickel layer thickness is 7-11 micrometers.

[0030] Specifically, after the base nickel-plated crown spring undergoes a second activation treatment, it is placed in a semi-bright nickel plating bath for electroplating. The drum speed in the semi-bright nickel plating bath is set to 8 RPM, the plating time to 6000 s, and the concentration of NiSO4·6H2O in the plating solution is between 270 and 300 g / L (or 280-290 g / L), while the concentration of NiCl2·6H2O is between 50 and 65 g / L. The concentration of iCl2·6H2O can be between 55 and 60 g / L, the concentration of H3BO3 can be between 40 and 60 g / L, and the concentration of H3BO3 can be between 45 and 55 g / L. The pH is adjusted to 4.4 to 4.7, and the temperature is 48 to 54℃. Alternatively, the pH can be between 4.5 and 4.6, and the temperature can be between 50 and 52℃. The total thickness of the nickel layer after electroplating is between 7 and 11 micrometers. Specifically, the thickness can be 7 micrometers or 11 micrometers.

[0031] S7: Immerse the roller in pure water for 28-32 seconds, then immerse it in pure water for ultrasonic cleaning for 58-65 seconds. After ultrasonic cleaning, remove the parts and clean them to remove oil stains. After drying, place them in an oven at a temperature of 75-85℃. Specifically, after electroplating in a semi-bright nickel plating bath, immerse the roller along with the crown spring in pure water for 28 or 32 seconds, then immerse it in pure water for ultrasonic cleaning for 58 or 65 seconds. After cleaning, blow it dry and place it in an oven at a temperature of 75-85℃. After drying, the nickel plating is complete.

[0032] In some embodiments, the sulfuric acid concentration activation tank in step S2 includes a mixture of 95L water and 5L sulfuric acid, and the sulfuric acid concentration in the sulfuric acid concentration activation tank is 5%.

[0033] In some embodiments, the nickel plating method for the crown spring is barrel plating, in which a driving drum is rotated to perform electroplating.

[0034] In some embodiments, in the nickel plating bath of step S3, the concentration of NiSO4·6H2O is 250-270 g / L, the concentration of NiCl2·6H2O is 45-50 g / L, the concentration of H3BO3 is 45-50 g / L, the temperature is 45-47°C, and the thickness of the base nickel after electroplating is 3.5-4.5 micrometers.

[0035] Specifically, in step S3, the electroplating solution in the nickel plating bath has a NiSO4·6H2O concentration of 250 g / L or 270 g / L, a NiCl2·6H2O concentration of 45 g / L or 50 g / L, an H3BO3 concentration of 45 g / L or 50 g / L, a temperature of 45 degrees Celsius or 47 degrees Celsius, and a base nickel thickness of 3.5 to 4.5 micrometers after electroplating.

[0036] In some embodiments, in the semi-bright nickel plating bath of step S6, the concentration of NiSO4·6H2O is 280-290 g / L, the concentration of NiCl2·6H2O is 55-60 g / L, the concentration of H3BO3 is 45-55 g / L, the pH is 4.5-4.6, the temperature is 50-52°C, and the thickness of the nickel layer after electroplating is 8-10 micrometers.

[0037] Specifically, in step S6, the concentration of NiSO4·6H2O in the electroplating bath is 280 g / L or 290 g / L, the concentration of NiCl2·6H2O is 55 g / L or 60 g / L, the concentration of H3BO3 is 45 g / L or 55 g / L, the pH is between 4.5 and 4.6, the temperature is 50℃ or 52℃, and the thickness of the nickel layer after electroplating is between 8 and 10 micrometers.

[0038] This application achieves a nickel plating layer with good adhesion, high hardness, wear resistance, and corrosion resistance by changing the concentration of each ion in the electroplating bath.

[0039] The embodiments of the present invention have been described in detail above, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and these variations still fall within the protection scope of the present invention.

Claims

1. A method for nickel plating a crown spring, characterized in that, The nickel plating method for the crown spring includes the following steps: S1: Place the workpiece to be plated and the steel balls to be plated together into the roller, wherein the diameter of the steel balls to be plated is 2-4 mm; place the roller into a pure water tank for cleaning for 20-60 seconds, then place the roller into an alkaline degreasing tank and ultrasonically clean for 80-110 seconds, then place the roller into a pure water tank for cleaning for 20-40 seconds. The water should be changed in time during cleaning to prevent the concentration of degreasing agent in the tank from being too high, which would cause the roller to carry the degreasing agent into the nickel plating tank and affect the subsequent electroplating; then place the roller into a pure water tank for ultrasonic cleaning for 50-70 seconds. S2: Place the above roller into an activation tank with a sulfuric acid concentration of 4% to 5% for 12 to 18 seconds; S3: Place the above-mentioned roller into a nickel plating bath with NiSO4·6H2O concentration of 240-280 g / L, NiCl2·6H2O concentration of 40-55 g / L, H3BO3 concentration of 40-55 g / L, pH of 4.3-4.5, and temperature of 44-48℃. Set the roller speed to 6 RPM and the plating time to 4500 s for plating. At this time, the base nickel thickness is 3-5 micrometers. S4: Take out the roller with the base nickel plated and put it into a pure water tank for cleaning for 14-16 seconds, and then put the roller into a pure water tank for ultrasonic cleaning for 28-32 seconds. S5: Place the roller from the previous step into an activation bath with a sulfuric acid concentration of 4% to 5% for activation treatment in preparation for the next step of nickel plating; S6: Place the previous roller into a semi-bright nickel plating bath with NiSO4·6H2O concentration of 270-300 g / L, NiCl2·6H2O concentration of 50-65 g / L, H3BO3 concentration of 40-60 g / L, pH of 4.4-4.7, and temperature of 48-54℃. Set the roller speed to 8 RPM and the plating time to 6000 s for plating. At this time, the nickel layer thickness is 7-11 micrometers. S7: Immerse the roller in pure water for 28-32 seconds, then immerse it in pure water for ultrasonic cleaning for 58-65 seconds. After ultrasonic cleaning, remove the parts for further cleaning to remove oil stains. After drying, place them in an oven at 75-85°C for drying.

2. The method for nickel plating a crown spring according to claim 1, characterized in that, The sulfuric acid concentration activation tank in step S2 contains a mixture of 95L of water and 5L of sulfuric acid.

3. The method for nickel plating a crown spring according to claim 1, characterized in that, The nickel plating method for the crown spring is barrel plating.

4. The method for nickel plating a crown spring according to claim 3, characterized in that, In step S3, the concentration of NiSO4·6H2O in the nickel plating bath is 250–270 g / L, the concentration of NiCl2·6H2O is 45–50 g / L, the concentration of H3BO3 is 45–50 g / L, the temperature is 45–47 °C, and the thickness of the base nickel after electroplating is 3.5–4.5 micrometers.

5. The method for nickel plating a crown spring according to claim 1, characterized in that, In the semi-bright nickel plating bath of step S6, the concentration of NiSO4·6H2O is 280-290 g / L, the concentration of NiCl2·6H2O is 55-60 g / L, the concentration of H3BO3 is 45-55 g / L, the pH is 4.5-4.6, the temperature is 50-52℃, and the thickness of the nickel layer after electroplating is 8-10 micrometers.