CN113151873A - Process method for improving electroplating corrosion resistance - Google Patents
Process method for improving electroplating corrosion resistance Download PDFInfo
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- CN113151873A CN113151873A CN202110459410.2A CN202110459410A CN113151873A CN 113151873 A CN113151873 A CN 113151873A CN 202110459410 A CN202110459410 A CN 202110459410A CN 113151873 A CN113151873 A CN 113151873A
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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
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/10—Other heavy metals
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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
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion 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
- C25D5/10—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
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
- C25F1/02—Pickling; Descaling
- C25F1/04—Pickling; Descaling in solution
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- Materials Engineering (AREA)
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- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
The invention relates to the technical field of electroplating corrosion resistance, in particular to a process method for improving electroplating corrosion resistance, which comprises the following steps: carrying out electrolytic degreasing on the workpiece; carrying out acid cleaning and rust removal on the workpiece after overflowing washing water; alkaline electrolytic degreasing is carried out on the workpiece after the overflow washing; performing acid electrolysis on the workpiece after overflowing washing water; plating semi-gloss nickel on the workpiece after the overflow washing; plating full bright nickel on the workpiece plated with the semi-bright nickel; carrying out chrome plating on the workpiece after overflowing washing; and (4) performing electrolytic passivation by using an electrolytic protective agent on the workpiece after overflowing washing water to obtain the electroplated workpiece. After the workpiece is electroplated with nickel and chromium, the electrolytic protective agent is added for electrolysis to perform electrolytic passivation protection of the chromium coating, so that the corrosion resistance is improved, and the service life of the workpiece product is effectively prolonged.
Description
Technical Field
The invention relates to the technical field of electroplating corrosion resistance, in particular to a process method for improving electroplating corrosion resistance.
Background
With the continuous development of electroplating technology and the increasing functional requirements of consumers, in the existing nickel and chromium plating process, the thickness of a plating layer on the surface of a workpiece is uneven due to the difference of high and low potentials and the inconsistent current efficiency of the front side and the side of an electroplating product in the electroplating process, so that the corrosion resistance of the electroplating product is reduced, the nickel and chromium plating product can only pass the standard of grade 7 for 24 hours under the neutral salt spray test condition, the product is easy to rust in the use process, and the use requirements of customers under different environments (such as a wet kitchen, a toilet and the like) can not be met.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a process method for improving electroplating corrosion resistance.
In order to solve the technical problems, the invention adopts the following technical scheme:
a process for improving the corrosion resistance of electroplating comprising the steps of:
carrying out electrolytic degreasing on the workpiece;
carrying out first overflow washing on the workpiece subjected to electrolytic degreasing;
carrying out acid cleaning and rust removal on the workpiece after overflowing washing water;
performing secondary overflow washing on the workpiece subjected to acid washing and rust removal;
alkaline electrolytic degreasing is carried out on the workpiece after the overflow washing;
carrying out third overflow washing on the workpiece subjected to alkaline electrolysis degreasing;
performing acid electrolysis on the workpiece after overflowing washing water;
carrying out fourth overflow washing on the workpiece subjected to acid electrolysis;
plating semi-gloss nickel on the workpiece after the overflow washing;
plating full bright nickel on the workpiece plated with the semi-bright nickel;
performing fifth overflow washing on the workpiece plated with the full bright nickel;
carrying out chrome plating on the workpiece after overflowing washing;
carrying out sixth overflow washing on the workpiece subjected to chrome plating;
electrolytic passivation is carried out on the workpiece after overflowing washing water by using an electrolytic protective agent;
and performing seventh overflow washing on the workpiece subjected to electrolytic passivation by the electrolytic protective agent to obtain the electroplated workpiece.
The further technical scheme is as follows: in the step of electrolytic degreasing of the workpiece, the electrolytic degreasing comprises cathodic electrolytic degreasing and anodic electrolytic degreasing; the working parameters of the cathodic electrolysis degreasing are as follows: 80-100g/L of electric release oil powder, 5-10g/L of sodium hydroxide, 50-60 ℃ of temperature and 4-8A/dm of current2For 3-5 min; the working parameters of the anode electrolysis degreasing are as follows: 80-100g/L of electric release oil powder, 5-10g/L of sodium hydroxide, 50-60 ℃ of temperature and 4-8A/dm of current2The time is 3-5 min.
The further technical scheme is as follows: in the step of carrying out acid cleaning and rust removing on the workpiece after overflowing washing water, the working parameters of acid cleaning and rust removing are as follows: hydrochloric acid: 1:2 of water and 100ml/L of acid cleaning agent for 5-8 min.
The further technical scheme is as follows: in the step of alkaline electrolytic degreasing of the workpiece after the overflow washing, the working parameters of the alkaline electrolytic degreasing are as follows: 50-80g/L of electric release oil powder, 5-8g/L of sodium hydroxide, 50-60 ℃ of temperature and 4-8A/dm of current2The time is 2-4 min.
The further technical scheme is as follows: in the step of performing acid electrolysis on the workpiece after the overflow washing, the working parameters of the acid electrolysis are as follows: sulfuric acid 50-80g/L and current 3-5A/dm2The time is 10-20 seconds.
The further technical scheme is as follows: in the step of plating semi-gloss nickel on the workpiece after the overflow washing, the working parameters of the semi-gloss nickel plating are as follows: 200g/L of nickel sulfate 160-2At 45-60 deg.C and pH of 3.8-4.5 for 3-5 min.
The further technical scheme is as follows: in the step of plating full bright nickel on the workpiece plated with the semi-bright nickel, the working parameters of the full bright nickel plating are as follows: 200g/L of nickel sulfate, 50-60g/L of nickel chloride, 40-50g/L of boric acid and 2-4A/dm of anode current density2At 50-60 deg.C, pH 4.2-4.8, time 3-5min, nickel major polishing agent 0.5ml/L, nickel softening agent 10ml/L, and wetting agent 1 ml/L.
The further technical scheme is as follows: the workpiece after overflowing washing water is subjected to chromium platingIn the step, the working parameters of the chromium plating are as follows: chromic anhydride 200g/L, sulfuric acid 0.5-1g/L, trivalent chromium 1-3g/L, and current density 8-12A/dm2The temperature is 20-28 ℃, and the chromium displacement water is 5-10 ml/L.
The further technical scheme is as follows: in the step of electrolytic passivation of the electrolytic protective agent on the workpiece after the overflow washing, the electrolytic protective agent has the following working parameters: 80-100ml/L of electrolytic protective agent, 4-5 of PH value, 30-120 seconds of time and 0.2-1A/dm of current density2At a temperature of 25-50 ℃.
The further technical scheme is as follows: the first overflow washing water, the second overflow washing water, the third overflow washing water, the fourth overflow washing water, the fifth overflow washing water, the sixth overflow washing water and the seventh overflow washing water are all normal-temperature tap water.
Compared with the prior art, the invention has the beneficial effects that: after the workpiece is electroplated with nickel and chromium, an electrolytic protective agent is added for electrolysis to perform electrolytic passivation protection of the chromium coating, so that the corrosion resistance is improved, and the service life of the workpiece product is effectively prolonged.
The invention is further described below with reference to the accompanying drawings and specific embodiments.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a flow chart of a process for improving the corrosion resistance of electroplating according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and the detailed description.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be connected or detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, a first feature "on," "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above should not be understood to necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by one skilled in the art.
In the embodiment shown in fig. 1, the invention discloses a process for improving the corrosion resistance of electroplating, which comprises the following steps:
s1, performing electrolytic degreasing on the workpiece;
in the step S1, electrolytic degreasing comprises cathodic electrolytic degreasing and anodic electrolytic degreasing; the working parameters of the cathodic electrolysis degreasing are as follows: 80-100g/L of electric release oil powder, 5-10g/L of sodium hydroxide, 50-60 ℃ of temperature and 4-8A/dm of current2For 3-5 min; the working parameters of the anode electrolysis degreasing are as follows: 80-100g/L of electric release oil powder, 5-10g/L of sodium hydroxide, 50-60 ℃ of temperature and 4-8A/dm of current2The time is 3-5min, the device is used for removing various impurities from the workpiece, the effect is good, the speed is high, and the workpiece is not corroded.
S2, performing first overflow washing on the workpiece subjected to electrolytic degreasing;
wherein, overflow wash water is used for realizing abluent cleanliness factor, gets rid of impurity and remains.
S3, performing acid cleaning and rust removing on the workpiece after overflowing washing water;
in the step S3, working parameters of acid cleaning and rust removing are as follows: hydrochloric acid: and (3) water is 1:2, and the acid cleaning agent is 100ml/L for 5-8min, and is used for removing the oxide on the surface of the workpiece.
S4, performing secondary overflow washing on the workpiece after acid washing and rust removal;
wherein, overflow wash water is used for realizing abluent cleanliness factor, gets rid of impurity and remains.
S5, alkaline electrolysis degreasing is carried out on the workpiece after overflow washing;
in the step S5, the working parameters of the alkaline electrolytic degreasing are: 50-80g/L of electric release oil powder, 5-8g/L of sodium hydroxide, 50-60 ℃ of temperature and 4-8A/dm of current2And the time is 2-4min, and the cleaning agent is used for removing oil stains on the surface of the workpiece.
S6, carrying out third overflow washing on the workpiece subjected to alkaline electrolysis degreasing;
wherein, overflow wash water is used for realizing abluent cleanliness factor, gets rid of impurity and remains.
S7, performing acid electrolysis on the workpiece after overflowing washing;
in the step S7, the working parameters of the acid electrolysis are: sulfuric acid 50-80g/L and current 3-5A/dm2The time is 10-20 seconds, and the electrolysis effect is good.
S8, performing fourth overflow washing on the workpiece after acid electrolysis;
wherein, overflow wash water is used for realizing abluent cleanliness factor, gets rid of impurity and remains.
S9, plating semigloss nickel on the workpiece after the overflow washing;
in the step S9, the working parameters of the semi-gloss nickel plating are: 200g/L of nickel sulfate 160-2The temperature is 45-60 ℃, the PH value is 3.8-4.5, and the time is 3-5min, so that the workpiece can obtain high finishThe flat nickel plating layer can effectively improve the corrosion resistance of the nickel plating layer.
S10, plating full bright nickel on the workpiece after the semi-bright nickel is plated;
in the step S10, the working parameters of the full bright nickel plating are: 200g/L of nickel sulfate, 50-60g/L of nickel chloride, 40-50g/L of boric acid and 2-4A/dm of anode current density2The temperature is 50-60 ℃, the PH value is 4.2-4.8, the time is 3-5min, the nickel main polishing agent is 0.5ml/L, the nickel softening agent is 10ml/L, and the wetting agent is 1ml/L, so that the workpiece has the effects of high hardness and strong corrosion resistance.
S11, performing fifth overflow washing on the workpiece plated with the full bright nickel;
wherein, overflow wash water is used for realizing abluent cleanliness factor, gets rid of impurity and remains.
S12, performing chrome plating on the workpiece subjected to overflow washing;
wherein, before chromium plating, chromium activation is needed, and chromic anhydride is adopted by 5-10 g/L. In step S12, the working parameters of the chrome plating are: chromic anhydride 200g/L, sulfuric acid 0.5-1g/L, trivalent chromium 1-3g/L, and current density 8-12A/dm2The temperature is 20-28 ℃, the chromium displacement water is 5-10ml/L, and the corrosion resistance of the workpiece is improved.
S13, carrying out sixth overflow washing on the chromium-plated workpiece;
wherein, overflow wash water is used for realizing abluent cleanliness factor, gets rid of impurity and remains.
S14, performing electrolytic passivation by using an electrolytic protective agent on the workpiece after overflowing washing;
in the step S14, the electrolytic passivation working parameters of the electrolytic protective agent are: 80-100ml/L of electrolytic protective agent, 4-5 of PH value, 30-120 seconds of time and 0.2-1A/dm of current density2And the temperature is 25-50 ℃, passivation protection is provided for the workpiece, and the corrosion resistance of the workpiece is improved.
In the embodiment, the electrolytic protective agent is a trivalent chromium electrolytic protective agent, so that the passivation protective effect is good, and the cost is low.
And S15, performing seventh overflow washing on the workpiece subjected to electrolytic passivation by the electrolytic protective agent to obtain an electroplated workpiece, and performing overflow washing to obtain a final workpiece product, so that the corrosion resistance is greatly improved.
In this embodiment, the first overflow washing water, the second overflow washing water, the third overflow washing water, the fourth overflow washing water, the fifth overflow washing water, the sixth overflow washing water, and the seventh overflow washing water all use normal-temperature tap water, which is simple and convenient and has low cost.
In the present embodiment, the workpiece is a door or window, a storage rack, or the like.
After the workpiece is electroplated with nickel and chromium, the electrolytic protective agent is added for electrolysis to perform electrolytic passivation protection of the chromium coating, so that the corrosion resistance is improved, and the service life of the workpiece product is effectively prolonged.
The above embodiments are preferred implementations of the present invention, and the present invention can be implemented in other ways without departing from the spirit of the present invention.
Claims (10)
1. A process for improving the corrosion resistance of electroplating, comprising the steps of:
carrying out electrolytic degreasing on the workpiece;
carrying out first overflow washing on the workpiece subjected to electrolytic degreasing;
carrying out acid cleaning and rust removal on the workpiece after overflowing washing water;
performing secondary overflow washing on the workpiece subjected to acid washing and rust removal;
alkaline electrolytic degreasing is carried out on the workpiece after the overflow washing;
carrying out third overflow washing on the workpiece subjected to alkaline electrolysis degreasing;
performing acid electrolysis on the workpiece after overflowing washing water;
carrying out fourth overflow washing on the workpiece subjected to acid electrolysis;
plating semi-gloss nickel on the workpiece after the overflow washing;
plating full bright nickel on the workpiece plated with the semi-bright nickel;
performing fifth overflow washing on the workpiece plated with the full bright nickel;
carrying out chrome plating on the workpiece after overflowing washing;
carrying out sixth overflow washing on the workpiece subjected to chrome plating;
electrolytic passivation is carried out on the workpiece after overflowing washing water by using an electrolytic protective agent;
and performing seventh overflow washing on the workpiece subjected to electrolytic passivation by the electrolytic protective agent to obtain the electroplated workpiece.
2. The process for improving the corrosion resistance of electroplating according to claim 1, wherein in the step of electrolytically degreasing the workpiece, the electrolytically degreasing includes cathodically electrolytically degreasing and anodically electrolytically degreasing; the working parameters of the cathodic electrolysis degreasing are as follows: 80-100g/L of electric release oil powder, 5-10g/L of sodium hydroxide, 50-60 ℃ of temperature and 4-8A/dm of current2For 3-5 min; the working parameters of the anode electrolysis degreasing are as follows: 80-100g/L of electric release oil powder, 5-10g/L of sodium hydroxide, 50-60 ℃ of temperature and 4-8A/dm of current2The time is 3-5 min.
3. The process method for improving the corrosion resistance of electroplating according to claim 1, wherein in the step of performing acid cleaning and rust removal on the workpiece after overflowing washing water, the working parameters of the acid cleaning and rust removal are as follows: hydrochloric acid: 1:2 of water and 100ml/L of acid cleaning agent for 5-8 min.
4. The process method for improving the corrosion resistance of electroplating according to claim 1, wherein in the step of alkaline electrolytic degreasing of the workpiece after overflowing washing water, the working parameters of alkaline electrolytic degreasing are as follows: 50-80g/L of electric release oil powder, 5-8g/L of sodium hydroxide, 50-60 ℃ of temperature and 4-8A/dm of current2The time is 2-4 min.
5. A process for improving the corrosion resistance of electroplating according to claim 1, wherein in the step of acid electrolysis of the workpiece after overflowing the washing water, the working parameters of the acid electrolysis are as follows:sulfuric acid 50-80g/L and current 3-5A/dm2The time is 10-20 seconds.
6. The process method for improving the corrosion resistance of electroplating according to claim 1, wherein in the step of plating the workpiece after overflowing the washing water with the semi-gloss nickel, the working parameters of the semi-gloss nickel plating are as follows: 200g/L of nickel sulfate 160-2At 45-60 deg.C and pH of 3.8-4.5 for 3-5 min.
7. The process method for improving the corrosion resistance of electroplating according to claim 1, wherein in the step of plating full bright nickel on the workpiece after the semi-bright nickel is plated, the working parameters of the full bright nickel plating are as follows: 200g/L of nickel sulfate, 50-60g/L of nickel chloride, 40-50g/L of boric acid and 2-4A/dm of anode current density2At 50-60 deg.C, pH 4.2-4.8, time 3-5min, nickel major polishing agent 0.5ml/L, nickel softening agent 10ml/L, and wetting agent 1 ml/L.
8. The process for improving the corrosion resistance of electroplating according to claim 1, wherein in the step of performing chromium plating on the workpiece after overflowing washing water, the working parameters of the chromium plating are as follows: chromic anhydride 200g/L, sulfuric acid 0.5-1g/L, trivalent chromium 1-3g/L, and current density 8-12A/dm2The temperature is 20-28 ℃, and the chromium displacement water is 5-10 ml/L.
9. The process method for improving the corrosion resistance of electroplating according to claim 1, wherein in the step of electrolytically passivating the workpiece after overflowing the washing water with the electrolytic protectant, the electrolytic protectant is electrolytically passivated with the following working parameters: 80-100ml/L of electrolytic protective agent, 4-5 of PH value, 30-120 seconds of time and 0.2-1A/dm of current density2At a temperature of 25-50 ℃.
10. The process of claim 1, wherein the first, second, third, fourth, fifth, sixth, and seventh overflow washings are tap water at room temperature.
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CN116555854A (en) * | 2023-04-12 | 2023-08-08 | 广州三孚新材料科技股份有限公司 | Golf club head and preparation method thereof |
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