CN115433981A - Process for electroplating high-corrosion-resistance bright black nickel on high-carbon steel snap spring - Google Patents
Process for electroplating high-corrosion-resistance bright black nickel on high-carbon steel snap spring Download PDFInfo
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- CN115433981A CN115433981A CN202211319272.9A CN202211319272A CN115433981A CN 115433981 A CN115433981 A CN 115433981A CN 202211319272 A CN202211319272 A CN 202211319272A CN 115433981 A CN115433981 A CN 115433981A
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/10—Electroplating with more than one layer of the same or of different metals
- C25D5/12—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium
- C25D5/14—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium two or more layers being of nickel or chromium, e.g. duplex or triplex layers
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/34—Pretreatment of metallic surfaces to be electroplated
- C25D5/36—Pretreatment of metallic surfaces to be electroplated of iron or steel
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/48—After-treatment of electroplated surfaces
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- Electroplating Methods And Accessories (AREA)
Abstract
The invention discloses a process for electroplating high-corrosion-resistant bright black nickel on a high-carbon steel snap spring, which comprises the following steps of: s5, electroplating of alkali copper: immersing the product into a tank body containing environment-friendly cyanide-free alkali copper, and electroplating a compact copper layer with the thickness of 1-2um on the surface of the product by using the environment-friendly cyanide-free alkali copper; s6, plating nickel sulfamate: immersing the product with the compact copper layer into a tank body containing nickel sulfamate solution, and electroplating a nickel sulfamate layer on the basis of the compact copper layer after electrifying; s7, plating bright nickel: immersing the product into a tank body filled with bright nickel solution, and plating a bright nickel layer on the basis of the nickel sulfamate layer after electrifying; s8, black nickel plating: the product is immersed into a tank body containing black nickel solution, and a black nickel layer can be plated on the basis of the bright black nickel layer after electrification. The beneficial effects of the invention are: the salt spray performance is improved, the blackness of the product is improved, the decarburization phenomenon is avoided, and the nickel plating efficiency is improved.
Description
Technical Field
The invention relates to the technical field of electroplating, in particular to a process for electroplating high-corrosion-resistant bright black nickel on a high-carbon steel snap spring.
Background
The high-carbon steel clamp spring is made of a steel material with the carbon content of 0.6-1.7%, and the outer surface of the clamp spring is not subjected to other special treatment. The process requires that a black nickel layer is plated on the outer surface of the high-carbon steel clamp spring to achieve the blackness required by customers. The existing electroplating process comprises the following steps: firstly removing oil stains on the surface of the high-carbon steel clamp spring in an acid washing mode, then activating the high-carbon steel clamp spring by hydrochloric acid, plating a pre-nickel plating layer on the surface of the high-carbon steel clamp spring after treatment, then plating a black nickel plating layer on the pre-nickel plating layer by using black nickel liquid medicine, cleaning the product, drying after cleaning, and finally obtaining the blackened product.
However, the black nickel plating process has the following technical defects:
I. the pickling concentration is higher, and the substrate of high carbon steel jump ring corrodes excessively, appears "the decarbonization" phenomenon, leads to the substrate poor binding force with the nickel layer of precoating, and then leads to the black nickel layer of plating to appear droing. II. The whole nickel layer is only provided with the pre-plated nickel layer and the black nickel layer, and the time for plating the black nickel is longer, so that the nickel plating efficiency is reduced. III, after the black nickel is plated, the blackness of the product is found to be insufficient, and the salt spray performance is found to be poor. Therefore, a process for electroplating high-corrosion-resistant bright black nickel on a high-carbon steel snap spring, which can improve the salt spray performance, the blackness of a product, avoid the decarburization phenomenon and improve the nickel plating efficiency, is urgently needed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a process for electroplating high-corrosion-resistant bright black nickel on a high-carbon steel snap spring, which is used for improving salt spray performance, improving product blackness, avoiding decarburization and improving nickel plating efficiency.
The purpose of the invention is realized by the following technical scheme: a process for electroplating high-corrosion-resistant bright black nickel on a high-carbon steel clamp spring comprises the following steps:
s1, barreling: immersing a high-carbon steel snap spring to be electroplated into a roller, adding a mixed abrasive and a grinding agent into the roller, opening a roller mill, driving the roller mill to rotate, closing the roller mill when centrifugal roller milling is carried out for 58 to 60min, and taking out a product;
s2, oil removal: immersing the barreled product into a tank body filled with a low-foam electrolytic degreasing agent, and removing oil stains on the surface of the product by using the low-foam electrolytic degreasing agent;
s3, hydrochloric acid activation: immersing the deoiled product into a tank body filled with an activation liquid, wherein the concentration of the activation liquid is 7 to 8 percent;
s4, nickel preplating: cleaning the product subjected to activation treatment by using pure water to remove the activation solution on the surface of the product, immersing the cleaned product into a tank body containing a hydrochloric acid + nickel chloride system, and plating a pre-plated nickel layer on the surface of the product after electrifying;
s5, electroplating alkali copper: immersing the product into a tank filled with environment-friendly cyanide-free alkali copper, and electroplating a compact copper layer with the thickness of 1 to 2um on the surface of the product by using the environment-friendly cyanide-free alkali copper;
s6, plating nickel sulfamate: immersing the product with the compact copper layer into a tank body containing nickel sulfamate solution, and electroplating a nickel sulfamate layer on the basis of the compact copper layer after electrifying;
s7, plating bright nickel: immersing the product into a tank body filled with bright nickel solution, and plating a bright nickel layer on the basis of the nickel sulfamate layer after electrifying;
s8, black nickel plating: immersing the product into a tank body containing black nickel solution, and plating a black nickel layer on the basis of the bright black nickel layer after electrifying;
s9, soaking in anti-rust oil: and (3) immersing the product into a tank body filled with rust-proof oil, taking out the product after a period of immersion, and sequentially washing and drying the product after the product is taken out, thereby finally obtaining the product with blackness.
The centrifugal barreling time in the step S1 is 60min.
The centrifugal barreling time in the step S1 is 59min.
The type of the low-foam electrolytic degreasing agent in the step S2 is WD-CL2.
The concentration of the activating solution in the step S3 is 8%.
And in the step S8, black nickel is plated in a copper wire mesh swinging mode.
The invention has the following advantages:
I. in the step S1, a high-carbon steel clamp spring to be electroplated is immersed into a roller, mixed abrasive and grinding agent are added into the roller, a tumbling mill is started and drives the roller to rotate, and when the centrifugal tumbling mill is used for 60min, the tumbling mill is closed and a product is taken out; thereby removing the burr and the rust on the surface and the bent part of the high-carbon steel clamp spring, improving the smoothness and effectively reducing the subsequent activation time.
II. In step S3, a product after oil removal is immersed into a tank body filled with an activation liquid, wherein the concentration of the activation liquid is 7 to 8 percent; the concentration of the activating solution is reduced from 20% to 7-8%, the acid concentration ratio is reduced, over-corrosion of the base material can be avoided, and the decarburization phenomenon is avoided, so that the binding force of a subsequent plating layer is improved, and meanwhile, the activation time is shortened to 90s.
III, immersing the product into a tank body containing environment-friendly cyanide-free alkali copper in step S5, and electroplating the environment-friendly cyanide-free alkali copper to form a compact copper layer with the thickness of 1-2um on the surface of the product; the compact copper layer is used for improving the flatness of the surface of a product, and meanwhile, nickel metal is easier to deposit on copper, and the bonding force of a plating layer is better.
IV, immersing the product with the compact copper layer into a tank body containing nickel sulfamate solution in the step S6 of the invention, and electroplating a nickel sulfamate layer on the basis of the compact copper layer after electrifying; because the nickel sulfamate has the advantages of low stress, no sulfur in the coating and high deposition speed, the nickel sulfamate layer is used as a thickened nickel layer, and compared with the traditional electroplating process for directly plating black nickel under the same thickness, the time can be reduced by about 50 percent; meanwhile, the corrosion resistance of the coating can be improved because the coating does not contain sulfur.
The method comprises the steps of immersing a product into a tank body filled with bright nickel solution, plating a bright nickel layer on the basis of the nickel sulfamate layer after electrifying, and thus increasing the blackness of the product.
Detailed Description
The present invention is further described below, and the scope of protection of the present invention is not limited to the following:
the first embodiment is as follows: a process for electroplating high-corrosion-resistant bright black nickel on a high-carbon steel clamp spring comprises the following steps:
s1, barreling: immersing a high-carbon steel snap spring to be electroplated into a roller, adding a mixed abrasive and a grinding agent into the roller, opening a tumbling mill, driving the roller to rotate by the tumbling mill, closing the tumbling mill when centrifugal tumbling is carried out for 60min, and taking out a product; thereby removing burrs and iron rust on the surface and the bent part of the high-carbon steel clamp spring, improving the smoothness and effectively reducing the subsequent activation time;
s2, oil removal: immersing the barreled product into a tank body filled with WD-CL2 type low-foam electrolytic degreasing agent, wherein the WD-CL2 type low-foam electrolytic degreasing agent removes oil stains on the surface of the product, and the type of the low-foam electrolytic degreasing agent is WD-CL2;
s3, hydrochloric acid activation: immersing the deoiled product into a tank body filled with an activation liquid, wherein the concentration of the activation liquid is 7-8%; the concentration of the activating solution is reduced from 20% to 7-8%, the acid concentration ratio is reduced, over-corrosion of the base material can be avoided, and the decarburization phenomenon is avoided, so that the binding force of a subsequent plating layer is improved, and meanwhile, the activation time is shortened to 90s;
s4, nickel preplating: cleaning the product subjected to activation treatment by using pure water to remove the activation solution on the surface of the product, immersing the cleaned product into a tank body containing a hydrochloric acid + nickel chloride system, and plating a pre-plated nickel layer on the surface of the product after electrifying;
s5, electroplating alkali copper: immersing the product into a tank body containing environment-friendly cyanide-free alkali copper, and electroplating a compact copper layer with the thickness of 1-2um on the surface of the product by using the environment-friendly cyanide-free alkali copper; the compact copper layer is used for improving the flatness of the surface of a product, and meanwhile, nickel metal is easier to deposit on copper, and the binding force of a plating layer is better.
S6, plating nickel sulfamate: immersing the product with the compact copper layer into a tank body containing nickel sulfamate solution, and electroplating a nickel sulfamate layer on the basis of the compact copper layer after electrifying; because the nickel sulfamate has the advantages of low stress, no sulfur in the coating and high deposition speed, the nickel sulfamate layer is used as a thickened nickel layer, and compared with the traditional electroplating process for directly plating black nickel under the same thickness, the time can be reduced by about 50 percent; meanwhile, as the plating layer does not contain sulfur, the corrosion resistance of the plating layer can be improved;
s7, plating bright nickel: immersing the product into a tank body filled with bright nickel solution, and plating a bright nickel layer on the basis of the nickel sulfamate layer after electrifying; by introducing the step of bright nickel, the nickel layer is crystallized to be fine, so that the product reaches the mirror surface appearance, and the blackness of the product is improved;
s8, black nickel plating: the product is immersed into a tank body containing black nickel solution, after the power is switched on, a black nickel layer can be plated on the basis of the bright black nickel layer, and the black nickel is plated in a copper wire mesh swinging mode, so that the turning amplitude of the part can be greatly improved. The surface is evenly plated;
s9, soaking in anti-rust oil: and (3) immersing the product into a tank body containing anti-rust oil, taking out the product after soaking for a period of time, and sequentially carrying out cleaning and drying treatment after taking out the product, thereby finally obtaining the product with blackness. By adding the procedure of soaking in anti-rust oil, the salt spray resistance and the product blackness can be effectively improved.
The electroplating process adopts a composite nickel plating method to realize the black nickel plating on the product, namely, the product is plated with the sulfamic acid nickel layer, the bright nickel layer and the black nickel layer, wherein the sulfamic acid nickel layer is used as the thickened nickel layer, and compared with the traditional electroplating process for directly plating the black nickel under the same thickness, the time can be reduced by about 50 percent, thereby greatly improving the nickel plating efficiency.
In addition, in the step S2, the concentration of the activating solution is reduced from 20% to 7-8%, the acid concentration ratio is reduced, over-corrosion of the base material can be avoided, the phenomenon of decarburization is avoided, the phenomenon that the electroplated black nickel layer falls off is effectively avoided, and meanwhile, the activation time is shortened to 90S.
In addition, in step S5, a compact copper layer is electroplated on the product in advance, and then the sulfamic acid nickel layer, the bright nickel layer and the black nickel layer are electroplated in sequence, so that the overall binding force is obviously improved, and the salt spray performance is greatly improved.
The second embodiment: the difference between the present embodiment and the first embodiment is: the centrifugal barreling time in the step S1 is 58min, and the concentration of the activating solution in the step S3 is 8%.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A process for electroplating high corrosion-resistant bright black nickel on a high-carbon steel clamp spring is characterized by comprising the following steps: the method comprises the following steps:
s1, barreling: immersing a high-carbon steel snap spring to be electroplated into a roller, adding a mixed abrasive and a grinding agent into the roller, opening a roller mill, driving the roller mill to rotate, closing the roller mill when centrifugal roller milling is carried out for 58 to 60min, and taking out a product;
s2, oil removal: immersing the barreled product into a tank body filled with a low-foam electrolytic degreasing agent, and removing oil stains on the surface of the product by using the low-foam electrolytic degreasing agent;
s3, hydrochloric acid activation: immersing the deoiled product into a tank body filled with an activation liquid, wherein the concentration of the activation liquid is 7 to 8 percent;
s4, nickel preplating: cleaning the product subjected to activation treatment by using pure water to remove the activation solution on the surface of the product, immersing the cleaned product into a tank body containing a hydrochloric acid + nickel chloride system, and plating a pre-plated nickel layer on the surface of the product after electrifying;
s5, electroplating of alkali copper: immersing the product into a tank body containing environment-friendly cyanide-free alkali copper, and electroplating a compact copper layer with the thickness of 1-2um on the surface of the product by using the environment-friendly cyanide-free alkali copper;
s6, plating nickel sulfamate: immersing the product with the compact copper layer into a tank body containing nickel sulfamate solution, and electroplating a nickel sulfamate layer on the basis of the compact copper layer after electrifying;
s7, plating bright nickel: immersing the product into a tank filled with bright nickel solution, and plating a bright nickel layer on the basis of the nickel sulfamate layer after electrifying;
s8, black nickel plating: immersing the product into a tank body containing black nickel solution, and plating a black nickel layer on the basis of the bright black nickel layer after electrifying;
s9, soaking in anti-rust oil: and (3) immersing the product into a tank body containing anti-rust oil, taking out the product after soaking for a period of time, and sequentially carrying out cleaning and drying treatment after taking out the product, thereby finally obtaining the product with blackness.
2. The process for electroplating high-corrosion-resistant bright black nickel on the high-carbon steel clamp spring according to claim 1, wherein the process comprises the following steps: the centrifugal barreling time in the step S1 is 60min.
3. The process for electroplating high-corrosion-resistant bright black nickel on the high-carbon steel clamp spring according to claim 1, wherein the process comprises the following steps: the centrifugal barreling time in the step S1 is 59min.
4. The process for electroplating high-corrosion-resistant bright black nickel on the high-carbon steel clamp spring according to claim 1, wherein the process comprises the following steps: the type of the low-foam electrolytic degreasing agent in the step S2 is WD-CL2.
5. The process for electroplating high-corrosion-resistant bright black nickel on the high-carbon steel clamp spring according to claim 1, wherein the process comprises the following steps: the concentration of the activating solution in the step S3 is 8%.
6. The process for electroplating high-corrosion-resistant bright black nickel on the high-carbon steel clamp spring according to claim 1, wherein the process comprises the following steps: in step S8, black nickel is plated by using a copper wire mesh swing method.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211319272.9A CN115433981A (en) | 2022-10-26 | 2022-10-26 | Process for electroplating high-corrosion-resistance bright black nickel on high-carbon steel snap spring |
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| CN202211319272.9A CN115433981A (en) | 2022-10-26 | 2022-10-26 | Process for electroplating high-corrosion-resistance bright black nickel on high-carbon steel snap spring |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114540896A (en) * | 2022-03-24 | 2022-05-27 | 东莞市立敏达电子科技有限公司 | Matte black electroplating structure and electroplating method for surface of iron piece |
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2022
- 2022-10-26 CN CN202211319272.9A patent/CN115433981A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114540896A (en) * | 2022-03-24 | 2022-05-27 | 东莞市立敏达电子科技有限公司 | Matte black electroplating structure and electroplating method for surface of iron piece |
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