CN105970264A - Electroplating liquid for cylinder outside-tank electroplating - Google Patents
Electroplating liquid for cylinder outside-tank electroplating Download PDFInfo
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- CN105970264A CN105970264A CN201610481732.6A CN201610481732A CN105970264A CN 105970264 A CN105970264 A CN 105970264A CN 201610481732 A CN201610481732 A CN 201610481732A CN 105970264 A CN105970264 A CN 105970264A
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- electroplate liquid
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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
- C25D7/00—Electroplating characterised by the article coated
- C25D7/04—Tubes; Rings; Hollow bodies
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D15/00—Electrolytic or electrophoretic production of coatings containing embedded materials, e.g. particles, whiskers, wires
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/12—Electroplating: Baths therefor from solutions of nickel or cobalt
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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
- C25D5/08—Electroplating with moving electrolyte e.g. jet electroplating
-
- 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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- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
The invention discloses an electroplating liquid for cylinder outside-tank electroplating. The electroplating liquid comprises an electroplating liquid A for pre-electroplating nickel and an electroplating liquid B for electroplating a nickel-silicon carbide composite coating, wherein the electroplating liquid A contains 246-626g/L of nickel sulfate and 35-45g/L of boric acid; the electroplating liquid B contains 246-626g/L of nickel sulfate, 35-45g/L of boric acid, 10-45g/L of silicon carbide and 0.5-2.5g/L of an electroplating additive; the electroplating liquid adopts the electroplating liquid formula which pre-electroplates nickel and then electroplates a composite nickel layer, is suitable for outside-tank electroplating, and combined with the scheme that flowing electroplating liquid ensures real-time replacement of cations on the coating, the concentration difference of the cations on the surface of the cathodic coating is basically unchanged, relative large concentration difference is prevented, and the variation in the thickness of the electroplating layer is controllable; and meanwhile, the no-difference concentration is combined with the special proportion of the electroplating liquid to ensure a dense and compact coating, prevent loose combination and to ensure the electroplating quality.
Description
Technical field
The present invention relates to the electroplate liquid of a kind of cylinder body class workpiece, particularly to the plating for groove outflow galvanic electricity plating
Liquid.
Background technology
Cylinder body, as the critical piece of electromotor, for collectively constituting combustor with piston, cylinder head, and is piston
Assembly provides movement locus, thus forms power switching environment.Cylinder constantly moves back and forth at guiding piston
During, long-time between cylinder inner wall and piston, altofrequency ground friction mutually, cause cylinder action has
Reduce with power, consume part energy.Therefore, prior art occurs in that and electroplates at inwall, with plating
Coating replaces cylinder sleeve to solve the problems referred to above.In common electroplating technology, electroplate liquid is in the environment of basic static
In, cation is moved as the inner surface of cylinder block of negative electrode by trend, and the concentration difference of formation causes coating not consolidation,
Thus be prone to come off, and electroplating time is longer；And due to the problem of concentration difference so that the plating of final product
Layer thickness variation is big, wayward, and some critical sizes resulting in cylinder block inner surface are difficult to control, thus,
End product quality after plating ensures more difficulty.In prior art, have and circulate electroplate liquid at cylinder body internal circular surfaces
The technical scheme of electronickelling-silicon carbide compound layer, but due to electroplating technology it cannot be guaranteed that the quality of composite deposite, obtain
The final cylinder body product taken can not meet use needs；The most traditional plating solution formula itself, with tradition
Electroplating technology and new technology cannot form coupling, cause final conforming product rate the highest, service life without
Method reaches intended problem.
Accordingly, it would be desirable to the electroplate liquid electroplating existing cylinder body improves, it is adaptable to groove is foreign-plated, with groove outside
Electroplating technology coordinates, and makes cathodic coating surface cation concn difference the most unchanged so that thickness of coating becomes
Change controlled, and consolidation is fine and close, it is ensured that electroplating quality.
Summary of the invention
In view of this, it is an object of the invention to provide a kind of electroplate liquid foreign-plated for cylinder body groove, make negative electrode plate
Layer surface cation concn difference is the most unchanged so that thickness of coating change is controlled, and consolidation is fine and close, it is ensured that electricity
Plating quality.
The electroplate liquid foreign-plated for cylinder body groove of the present invention, including electroplate liquid A and electroplate liquid B；
In electroplate liquid A, there is nickel sulfate 246-626g/L and boric acid 35-45g/L；
In electroplate liquid B, have nickel sulfate 246-626g/L, boric acid 35-45g/L, carborundum 10-45g/L and
Electroplating additive 0.5-2.5g/L；
During use, electroplate liquid A be used for electronickelling in advance, electroplate liquid B carry out after electronickelling in advance electronickelling-
SiC composite coat；Certainly, need the pretreatment of necessity before electronickelling, do not repeat them here；Plating is added
The selection of agent is then for easily improving the additive of coating performance；The electroplating bath components concentration of the present embodiment is suitable for groove
Foreign-plated, the foreign-plated electroplate liquid that refers generally to of groove flows through the technique of inner surface of cylinder block, between various compositions by power
Mutually coordinated and impact, be beneficial to formed dense uniform coating, it is ensured that the serviceability of finished product；Pre-nickel plating with
Final electronickelling-SiC composite coat has well, the combination of the most even densification, it is ensured that coating entirety
Bond strength.
Further, described electroplating additive is saccharin, and saccharin is mutually coordinated with other new components in electroplate liquid,
Coating stress and hardness can be effectively improved after interpolation, be suitable to the foreign-plated mode of cylinder body groove of the present invention.
Further, in electroplate liquid A, there is nickel sulfate 450g/L and boric acid 40g/L；In electroplate liquid B, tool
There are nickel sulfate 450g/L, boric acid 40g/L, carborundum 28g/L and electroplating additive 1.8g/L；The present embodiment
Electroplating bath components and ratio, be suitable in the foreign-plated technique of groove, and the coordination effect between each component
The most more preferably, intensity that the product of formation is final and hardness also can reach higher requirement to fruit.
Further, when electroplate liquid A and electroplate liquid B uses, described anode is tubular, and described anode is equal with cylinder body
Upright up and down and be coaxially disposed, electroplate liquid is flowed up also by the annular space between inner surface of cylinder block and anode outer surface
Refluxed by anode endoporus；The electroplate liquid using intracavity flowing forms the scheme of plating environment, and the electroplate liquid of flowing is protected
The cation demonstrate,proved on coating substitutes in real time, makes cathodic coating surface cation concn difference the most unchanged, it is to avoid
Forming bigger concentration difference, thickness of coating change is controlled, meanwhile, in conjunction with electroplating bath components and the ratio of the present invention,
Forming indiscriminate concentration, it is ensured that the closely knit of coating is compacted, meanwhile, the electroplate liquid of flowing can be taken away and coating
Cation in conjunction with defective tightness, it is to avoid the appearance of loose combination, it is ensured that electroplating quality.
Further, in use, electroplate liquid pH is adjusted to 1.3-1.8, electric current density 3-4A/dm to electroplate liquid A2；
In use, electroplate liquid pH is adjusted to 2.2-3.8, electric current density 30-40A/dm to electroplate liquid B2；PH value with
And electric current density when using, mutually coordinated with corresponding electroplating bath components and proportioning, it is possible to ensure the present invention's
Cation in electroplate liquid has good activity, is beneficial to be formed fine and close and that bond strength is high coating, further
Ensure electroplating quality.
Further, electroplate liquid also includes zinc conversional solution, before using electroplate liquid A plating, is existed by zinc conversional solution
Inner surface of cylinder block carries out chemistry zinc and converts, and the zinc conversional solution used includes: ZnO12-15g/L, hydroxide
Sodium 50-155g/L, ferric chloride 0.45-2.1g/L and zinc convert corrosion inhibiter 1.5-2.5g/L；This zinc conversional solution
It is applicable to groove external structure, good with electronickelling forming fine and close and that intensity is higher zinc conversion coating, beneficially later stage
In conjunction with, form preferably basis.
Further, described zinc converts corrosion inhibiter is sodium gluconate；It is sodium gluconate that zinc converts corrosion inhibiter, when
So may be used without zinc usual in prior art and convert corrosion inhibiter, and optimum is sodium gluconate.
Further, the time carrying out zinc conversion with zinc conversional solution is 60-90s, and temperature is 20-25 DEG C；This time
Scope and temperature range, adapt to and be matched with composition and the proportioning of zinc conversional solution, forms good zinc conversion coating,
So that zinc conversion coating is adapted to electroplating work procedure；Use the time that electroplate liquid A and electroplate liquid B carries out electroplating respectively
For 10-25min, temperature of electroplating solution is respectively 60-70 DEG C；According to thickness requirement adjustable；Temperature of electroplating solution is
60-70℃；This electroplating time scope and temperature range, it is possible to ensure the cation tool in the electroplate liquid of the present invention
There is good activity, be further ensured that electroplating quality.
Beneficial effects of the present invention: the electroplate liquid foreign-plated for cylinder body groove of the present invention, electroplate liquid uses preplating
Nickel and rear lining close the plating solution formula of nickel dam, it is adaptable to the foreign-plated technique of groove, and the electroplate liquid in conjunction with flowing ensures
The scheme that cation on coating substitutes in real time, makes the cathodic coating surface cation concn difference the most unchanged,
Avoiding the formation of bigger concentration difference, thickness of coating change is controlled；Meanwhile, indiscriminate concentration combines special electricity
Plating solution proportioning, it is ensured that the closely knit of coating is compacted, meanwhile, the electroplate liquid of flowing can be taken away and be combined not with coating
Cation closely, it is to avoid the appearance of loose combination, it is ensured that electroplating quality.
Detailed description of the invention
The electroplate liquid foreign-plated for cylinder body groove of the present embodiment, including electroplate liquid A and electroplate liquid B；
In electroplate liquid A, there is nickel sulfate 246-626g/L and boric acid 35-45g/L；
In electroplate liquid B, have nickel sulfate 246-626g/L, boric acid 35-45g/L, carborundum 10-45g/L and
Electroplating additive 0.5-2.5g/L；
During use, electroplate liquid A be used for electronickelling in advance, electroplate liquid B carry out after electronickelling in advance electronickelling-
SiC composite coat；Certainly, need the pretreatment of necessity before electronickelling, do not repeat them here；Plating is added
The selection of agent is then for easily improving the additive of coating performance；The electroplating bath components concentration of the present embodiment is suitable for groove
Foreign-plated, the foreign-plated electroplate liquid that refers generally to of groove flows through the technique of inner surface of cylinder block, between various compositions by power
Mutually coordinated and impact, be beneficial to formed dense uniform coating, it is ensured that the serviceability of finished product；Pre-nickel plating with
Final electronickelling-SiC composite coat has well, the combination of the most even densification, it is ensured that coating entirety
Bond strength.
In the present embodiment, described electroplating additive is saccharin, and saccharin is mutually assisted with other new components in electroplate liquid
Adjust, coating stress and hardness can be effectively improved after interpolation, be suitable to the foreign-plated mode of cylinder body groove of the present invention.
In the present embodiment, in electroplate liquid A, there is nickel sulfate 450g/L and boric acid 40g/L；In electroplate liquid B,
There is nickel sulfate 450g/L, boric acid 40g/L, carborundum 28g/L and electroplating additive 1.8g/L；This enforcement
The electroplating bath components of example and ratio, be suitable in the foreign-plated technique of groove, and the coordination between each component
Better, intensity that the product of formation is final and hardness also can reach higher requirement.
In the present embodiment, when electroplate liquid A and electroplate liquid B uses, described anode is tubular, described anode and cylinder
Body is the most upright and is coaxially disposed, electroplate liquid by the annular space between inner surface of cylinder block and anode outer surface to upstream
Move and refluxed by anode endoporus；The electroplate liquid using intracavity flowing forms the scheme of plating environment, the plating of flowing
Liquid ensure that the cation on coating substitutes in real time, makes cathodic coating surface cation concn difference the most unchanged,
Avoiding the formation of bigger concentration difference, thickness of coating change is controlled, meanwhile, in conjunction with the present invention electroplating bath components and
Ratio, forms indiscriminate concentration, it is ensured that the closely knit of coating is compacted, and meanwhile, the electroplate liquid of flowing can be taken away
The cation of defective tightness is combined, it is to avoid the appearance of loose combination, it is ensured that electroplating quality with coating.
In the present embodiment, in use, electroplate liquid pH is adjusted to 1.3-1.8, electric current density to electroplate liquid A
3-4A/dm2；In use, electroplate liquid pH is adjusted to 2.2-3.8, electric current density 30-40A/dm to electroplate liquid B2；
Electric current density when pH value and use, mutually coordinated with corresponding electroplating bath components and proportioning, it is possible to ensure
Cation in the electroplate liquid of the present invention has good activity, is beneficial to form fine and close and that bond strength is high plating
Layer, is further ensured that electroplating quality.
In the present embodiment, electroplate liquid also includes zinc conversional solution, before using electroplate liquid A plating, is converted by zinc
Liquid carries out chemistry zinc at inner surface of cylinder block and converts, and the zinc conversional solution used includes: ZnO12-15g/L, hydrogen
Sodium oxide 50-155g/L, ferric chloride 0.45-2.1g/L and zinc convert corrosion inhibiter 1.5-2.5g/L；This zinc turns
Change liquid and be applicable to groove external structure, form fine and close and that intensity is higher zinc conversion coating, beneficially later stage with electronickelling
Good combination, forms preferably basis.
In the present embodiment, it is sodium gluconate that described zinc converts corrosion inhibiter；It is sodium gluconate that zinc converts corrosion inhibiter,
Certainly may be used without zinc usual in prior art and convert corrosion inhibiter, and optimum is sodium gluconate.
In the present embodiment, the time carrying out zinc conversion with zinc conversional solution is 60-90s, and temperature is 20-25 DEG C；Should
Time range and temperature range, adapt to and be matched with composition and the proportioning of zinc conversional solution, forms good zinc and converts
Layer, so that zinc conversion coating is adapted to electroplating work procedure；Electroplate liquid A and electroplate liquid B is used to carry out the time electroplated
Being respectively 10-25min, temperature of electroplating solution is respectively 60-70 DEG C；According to thickness requirement adjustable；Plating liquid temperature
Degree is for 60-70 DEG C；This electroplating time scope and temperature range, it is possible to ensure the present invention electroplate liquid in sun from
Son has good activity, is further ensured that electroplating quality.
Below for the present invention for the foreign-plated specific embodiment of groove:
Embodiment one
Comprise the following steps:
A. pretreatment:
A1. etching, by the alkali liquor alkaline etching of NaOH 25g/L, the time is 175s, and Alkaline etchant temperature is 40 DEG C；
The mode using alkali liquor to flow through inner surface of cylinder block is carried out；
A2. being passivated, be passivated by acid solution, acid solution includes potassium hydrogen peroxymonosulfate 50g/L and sulphuric acid 6g/L；
Time is 175s, and pickling solution temperature is 35 DEG C；The mode using acid solution to flow through inner surface of cylinder block is carried out；
A3. activate, by Fluohydric acid. 13g/L acid solution, cylinder surfaces is corroded further；Time is 30s,
Temperature is room temperature；The mode using acid solution to flow through inner surface of cylinder block is carried out；
A4. zinc converts, and uses chemistry zinc to convert, makes cylinder surfaces form zinc layers；The zinc conversional solution used
Include: ZnO15g/L, sodium hydroxide 50g/L, ferric chloride 2.1g/L and sodium gluconate 1.5g/L；
Time is 90s, and temperature is 25 DEG C；The mode using zinc conversional solution to flow through inner surface of cylinder block is carried out；
B. groove is foreign-plated: as negative electrode and inner surface of cylinder block is coated at anode, electroplate liquid A and electroplate liquid B
Flow separately through the annular space between inner surface of cylinder block and anode outer surface and form plating environment, be energized and complete plating；
Particularly as follows:
B1 nickel preplating；Electroplate liquid A includes: nickel sulfate 246g/L and boric acid 35g/L；Adjust electroplate liquid A
PH be 1.3, electroplating current density 4A/dm2, the time is 25min, and electroplate liquid A temperature is 70 DEG C；
B2 electronickelling-SiC composite coat；Electroplate liquid B includes: nickel sulfate 246g/L, boric acid 35g/L,
Carborundum 10g/L and saccharin 2.5g/L；The pH adjusting electroplate liquid B is 2.2, electric current density 40A/dm2,
Time is 25min, and electroplate liquid B temperature is 70 DEG C；
C. subsequent treatment, conventional plating subsequent treatment；Subsequent treatment include electroplate liquid recycling, workpiece return
Receipts, follow-up cleaning, cured etc., do not repeat them here；Final washing typically uses full immersed type to wash；
Step a1, wash respectively between a2, a3, a4, b, c, do not repeat them here；a1、a2、
In a3, a4, the mode that flows through of liquid uses the structure similar with step b, does not repeats them here；Wherein
Step a4 can also be carried out as the first step in step b, forms zinc conversion coating, does not repeats them here.
Embodiment two
Comprise the following steps:
A. pretreatment:
A1. etching, by the alkali liquor alkaline etching of NaOH 5g/L, the time is 180s, and Alkaline etchant temperature is 60 DEG C；
The mode using alkali liquor to flow through inner surface of cylinder block is carried out；
A2. being passivated, be passivated by acid solution, acid solution includes potassium hydrogen peroxymonosulfate 12g/L and sulphuric acid 15g/L；
Time is 180s, and pickling solution temperature is 45 DEG C；The mode using acid solution to flow through inner surface of cylinder block is carried out；
A3. activate, by Fluohydric acid. 4g/L acid solution, cylinder surfaces is corroded further；Time is 90s,
Temperature is room temperature；The mode using acid solution to flow through inner surface of cylinder block is carried out；
A4. zinc converts, and uses chemistry zinc to convert, makes cylinder surfaces form zinc layers；The zinc conversional solution used
Include: ZnO12g/L, sodium hydroxide 155g/L, ferric chloride 0.45g/L and sodium gluconate 2.5g/L；
Time is 60s, and temperature is 20 DEG C；The mode using zinc conversional solution to flow through inner surface of cylinder block is carried out；
B. groove is foreign-plated: as negative electrode and inner surface of cylinder block is coated at anode, electroplate liquid A and electroplate liquid B
Flow separately through the annular space between inner surface of cylinder block and anode outer surface and form plating environment, be energized and complete plating；
Particularly as follows:
B1 nickel preplating；Electroplate liquid A includes: nickel sulfate 626g/L and boric acid 45g/L；Adjust electroplate liquid A
PH be 1.8, electroplating current density 3A/dm2, the time is 10min, and electroplate liquid A temperature is 60 DEG C；
B2 electronickelling-SiC composite coat；Electroplate liquid B includes: nickel sulfate 626g/L, boric acid 45g/L,
Carborundum 45g/L and saccharin 5g/L；The pH adjusting electroplate liquid B is 3.8, electric current density 30A/dm2, time
Between be 10min, electroplate liquid B temperature is 60 DEG C；
C. subsequent treatment, conventional plating subsequent treatment；Subsequent treatment include electroplate liquid recycling, workpiece return
Receipts, follow-up cleaning, cured etc., do not repeat them here；Final washing typically uses full immersed type to wash；
Step a1, wash respectively between a2, a3, a4, b, c, do not repeat them here；a1、a2、
In a3, a4, the mode that flows through of liquid uses the structure similar with step b, does not repeats them here；Wherein
Step a4 can also be carried out as the first step in step b, forms zinc conversion coating, does not repeats them here.
Embodiment three
Comprise the following steps:
A. pretreatment:
A1. etching, by the alkali liquor alkaline etching of NaOH 18g/L, the time is 178s, and Alkaline etchant temperature is 50 DEG C；
The mode using alkali liquor to flow through inner surface of cylinder block is carried out；
A2. being passivated, be passivated by acid solution, acid solution includes potassium hydrogen peroxymonosulfate 35g/L and sulphuric acid 9g/L；
Time is 178s, and pickling solution temperature is 40 DEG C；The mode using acid solution to flow through inner surface of cylinder block is carried out；
A3. activate, by Fluohydric acid. 8g/L acid solution, cylinder surfaces is corroded further；Time is 60s,
Temperature is room temperature；The mode using acid solution to flow through inner surface of cylinder block is carried out；
A4. zinc converts, and uses chemistry zinc to convert, makes cylinder surfaces form zinc layers；The zinc conversional solution used
Include: ZnO14g/L, sodium hydroxide 100g/L, ferric chloride 1.5g/L and sodium gluconate 2g/L；Time
Between be 75s, temperature is 22 DEG C；The mode using zinc conversional solution to flow through inner surface of cylinder block is carried out；
B. groove is foreign-plated: as negative electrode and inner surface of cylinder block is coated at anode, electroplate liquid A and electroplate liquid B
Flow separately through the annular space between inner surface of cylinder block and anode outer surface and form plating environment, be energized and complete plating；
Particularly as follows:
B1 nickel preplating；Electroplate liquid A includes: nickel sulfate 450g/L and boric acid 40g/L；Adjust electroplate liquid A
PH be 1.5, electroplating current density 3.5A/dm2, the time is 18min, and electroplate liquid A temperature is 65 DEG C；
B2 electronickelling-SiC composite coat；Electroplate liquid B includes: nickel sulfate 450g/L, boric acid 40g/L,
Carborundum 28g/L and saccharin 1.8g/L；The pH adjusting electroplate liquid B is 3, electric current density 35A/dm2, time
Between be 20min, electroplate liquid B temperature is 65 DEG C；
C. subsequent treatment, conventional plating subsequent treatment；Subsequent treatment include electroplate liquid recycling, workpiece return
Receipts, follow-up cleaning, cured etc., do not repeat them here；Final washing typically uses full immersed type to wash；
Step a1, wash respectively between a2, a3, a4, b, c, do not repeat them here；a1、a2、
In a3, a4, the mode that flows through of liquid uses the structure similar with step b, does not repeats them here.
The solution's solute concentration of the present invention refers to the Solute mass in 1L solution.
Finally illustrate, above example only in order to technical scheme to be described and unrestricted, although
With reference to preferred embodiment, the present invention is described in detail, it will be understood by those within the art that,
Technical scheme can be modified or equivalent, without deviating from technical solution of the present invention
Objective and scope, it all should be contained in the middle of scope of the presently claimed invention.
Claims (8)
1. one kind is used for the electroplate liquid that cylinder body groove is foreign-plated, it is characterised in that: include electroplate liquid A and electroplate liquid B；
In electroplate liquid A, there is nickel sulfate 246-626g/L and boric acid 35-45g/L；
In electroplate liquid B, have nickel sulfate 246-626g/L, boric acid 35-45g/L, carborundum 10-45g/L and
Electroplating additive 0.5-2.5g/L；
During use, electroplate liquid A be used for electronickelling in advance, electroplate liquid B carry out after electronickelling in advance electronickelling-
SiC composite coat.
The electroplate liquid foreign-plated for cylinder body groove the most according to claim 1, it is characterised in that: described electricity
Plating additive is saccharin.
The electroplate liquid foreign-plated for cylinder body groove the most according to claim 1 and 2, it is characterised in that: electricity
In plating solution A, there is nickel sulfate 450g/L and boric acid 40g/L；
In electroplate liquid B, there is nickel sulfate 450g/L, boric acid 40g/L, carborundum 28g/L and electroplating additive
1.8g/L。
The electroplate liquid foreign-plated for cylinder body groove the most according to claim 3, it is characterised in that: electroplate liquid
When A and electroplate liquid B uses, described anode is tubular, and described anode and cylinder body are the most upright and are coaxially disposed,
Electroplate liquid is flowed up by the annular space between inner surface of cylinder block and anode outer surface and is refluxed by anode endoporus.
The electroplate liquid foreign-plated for cylinder body groove the most according to claim 4, it is characterised in that: electroplate liquid
In use, electroplate liquid pH is adjusted to 1.3-1.8, electric current density 3-4A/dm to A2；Electroplate liquid B in use,
Electroplate liquid pH is adjusted to 2.2-3.8, electric current density 30-40A/dm2。
The electroplate liquid foreign-plated for cylinder body groove the most according to claim 4, it is characterised in that: electroplate liquid
Also include zinc conversional solution, before using electroplate liquid A plating, carry out chemistry by zinc conversional solution at inner surface of cylinder block
Zinc converts, and the zinc conversional solution used includes: ZnO12-15g/L, sodium hydroxide 50-155g/L, trichlorine
Change ferrum 0.45-2.1g/L and zinc converts corrosion inhibiter 1.5-2.5g/L.
The foreign-plated technique of cylinder body groove the most according to claim 7, it is characterised in that: described zinc converts slow
Erosion agent is sodium gluconate.
The electroplate liquid foreign-plated for cylinder body groove the most according to claim 7, it is characterised in that: turn with zinc
Changing liquid and carrying out time of zinc conversion is 60-90s, and temperature is 20-25 DEG C；
The time using electroplate liquid A and electroplate liquid B to carry out electroplating is respectively 10-25min, and temperature of electroplating solution divides
Wei 60-70 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610481732.6A CN105970264A (en) | 2016-06-27 | 2016-06-27 | Electroplating liquid for cylinder outside-tank electroplating |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610481732.6A CN105970264A (en) | 2016-06-27 | 2016-06-27 | Electroplating liquid for cylinder outside-tank electroplating |
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| CN105970264A true CN105970264A (en) | 2016-09-28 |
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| CN201610481732.6A Pending CN105970264A (en) | 2016-06-27 | 2016-06-27 | Electroplating liquid for cylinder outside-tank electroplating |
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| CN (1) | CN105970264A (en) |
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| CN112323110A (en) * | 2020-10-26 | 2021-02-05 | 江门市朝扬精密制造有限公司 | Electroplating device for inner surface of engine cylinder body |
| CN112695353A (en) * | 2020-12-11 | 2021-04-23 | 四川渝邻汽车零部件有限公司 | Preparation method of aluminum cylinder body composite electroplating |
| CN113881989A (en) * | 2021-11-12 | 2022-01-04 | 北京北方车辆集团有限公司 | Electroplating method for wear-resistant layer of shock absorber piston body |
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| CN112323110A (en) * | 2020-10-26 | 2021-02-05 | 江门市朝扬精密制造有限公司 | Electroplating device for inner surface of engine cylinder body |
| CN112695353A (en) * | 2020-12-11 | 2021-04-23 | 四川渝邻汽车零部件有限公司 | Preparation method of aluminum cylinder body composite electroplating |
| CN113881989A (en) * | 2021-11-12 | 2022-01-04 | 北京北方车辆集团有限公司 | Electroplating method for wear-resistant layer of shock absorber piston body |
| CN113881989B (en) * | 2021-11-12 | 2024-01-09 | 北京北方车辆集团有限公司 | Electroplating method for wear-resistant layer of piston body of shock absorber |
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