CN110273169A - A kind of cylinder liner internal wall spongy chromium plating technique - Google Patents
A kind of cylinder liner internal wall spongy chromium plating technique Download PDFInfo
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- CN110273169A CN110273169A CN201910686753.5A CN201910686753A CN110273169A CN 110273169 A CN110273169 A CN 110273169A CN 201910686753 A CN201910686753 A CN 201910686753A CN 110273169 A CN110273169 A CN 110273169A
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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
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/04—Electroplating: Baths therefor from solutions of chromium
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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
- 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
- C25D5/50—After-treatment of electroplated surfaces by heat-treatment
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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
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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
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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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Abstract
The invention discloses a kind of cylinder liner internal wall spongy chromium plating techniques, specifically includes the following steps: S1, grinding, S2, degreasing and rust removal processing, S3, chromium plating, S4, dehydrogenation heat treatment, S5, porosity, S6, inspection of coating, the present invention relates to surface treatment technical fields.The cylinder liner internal wall spongy chromium plating technique, it can be achieved by being optimized to cylinder jacket spongy chromium plating treatment process, to simplify the treatment process of cylinder jacket spongy chromium plating, achieve the purpose that not only quickly but also efficiently to carry out the processing of cylinder jacket spongy chromium plating well, significantly reduce the work load of producers, the procedure of processing of spongy chromium plating technique is simplified well, and improve spongy chromium plating effect, without spending producers to carry out the spongy chromium plating processing of cylinder jacket a large amount of time, the production cost of manufacturing enterprise is also saved simultaneously, improve the working efficiency of producers, work is handled to greatly facilitate the spongy chromium plating of the cylinder jacket of producers.
Description
Technical field
The present invention relates to surface treatment technical field, specially a kind of cylinder liner internal wall spongy chromium plating technique.
Background technique
Cylinder jacket is a cylindrical component, is placed in the cylinder body opening of body, on be fixed by cylinder head, piston exists
Its inner hole is reciprocating, and outer to have cooling water cooling, table is directly acted on by high-temperature high-pressure fuel gas in cylinder jacket, and always with work
High-speed slide friction occurs for plug ring and piston skirt, and appearance is contacted with cooling water, and serious thermal stress is generated under the larger temperature difference, by
Cooling water corrosion, piston not only aggravate table friction in it to the side-thrust of cylinder sleeve, and it is made to generate bending, and side-thrust changes direction
When, piston also hits cylinder sleeve.Additionally by biggish installation pretightening force, gas pressure make cylinder wall generate tangential stress and
Radial compressive stress, and in inner surface maximum, this stress is all dither stress, because casing wall internal-external temperature difference generates greatly
Thermal stress, make at general temperature inner surface generate compression and cooling surface there are tensile stresses, but under extra-high temperature, nearly inner surface
Metal creep plastic deformation, and residual tension is formed in inner surface after cooling down, it is this low caused by variation with starting, stopping
Frequency stress can make fatigue of materials, therefore, need to carry out promotion processing to the wearability of cylinder jacket in the production process of cylinder jacket.
Nitrogen treatment, laser surface hardening technology, plasma processing techniques are mostly used greatly in the inner wall to cylinder jacket at present
With electrodeposited chromium technology, these four technologies are handled, and wherein electrodeposited chromium processing technique is most widely used, and electrodeposited chromium technology
It is the most commonly used to be divided into spongy chromium plating, hard chromium plating and Britain Cromard patent chromium plating, spongy chromium plating.
The step of existing spongy chromium plating technique, is cumbersome, and spongy chromium plating effect is poor, needs to spend producers a large amount of
Time carry out the spongy chromium plating processing of cylinder jacket, while a large amount of production cost of manufacturing enterprise can also be spent to carry out at processing
Reason, can not achieve by optimizing to cylinder jacket spongy chromium plating treatment process, to simplify the processing work of cylinder jacket spongy chromium plating
Sequence is unable to reach the purpose for not only quickly but also efficiently carrying out the processing of cylinder jacket spongy chromium plating, considerably increases the work of producers
It bears, reduces the working efficiency of producers, to come to the spongy chromium plating processing work belt of the cylinder jacket of producers
Great inconvenience.
Summary of the invention
(1) the technical issues of solving
In view of the deficiencies of the prior art, it the present invention provides a kind of cylinder liner internal wall spongy chromium plating technique, solves existing
Spongy chromium plating technique the step of it is cumbersome, and spongy chromium plating effect is poor, needs that producers is spent a large amount of time to carry out gas
The spongy chromium plating of cylinder sleeve is handled, while a large amount of production cost of manufacturing enterprise can also be spent to be processed, and can not achieve logical
It crosses and cylinder jacket spongy chromium plating treatment process is optimized, to simplify the treatment process of cylinder jacket spongy chromium plating, be unable to reach both
The purpose for quickly and efficiently carrying out the processing of cylinder jacket spongy chromium plating, considerably increases the work load of producers, reduces
The problem of producers' working efficiency.
(2) technical solution
In order to achieve the above object, the present invention is achieved by the following technical programs: a kind of cylinder liner internal wall spongy chromium plating
Technique, specifically includes the following steps:
S1, grinding: carrying out grinding 15-25min by inner wall of the milling apparatus to cylinder jacket to be processed first, until to
The size for handling cylinder jacket corner part fillet is kept uniformly, without any visible scratch, then by the gas after milled processed
Cylinder sleeve is rinsed processing by flushing device, and then cylinder is mounted in the slot for filling solvent again, dips in solvent with brush and wipes
Brush cylinder sleeve surface can hold the characteristics of solving grease using gasoline, remove the mineral grease being attached on cylinder sleeve surface, oil removing
Method is cylinder sleeve；
S2, degreasing and rust removal processing: the cylinder jacket after step S1 gasoline oil removing is transferred in electrolytic cell, in the function of current
Under, it using cylinder sleeve as cathode or anode, is placed in electrochemical degreasing liquid and is electrolysed, electrolysis temperature is 80-90 DEG C, and electric current is close
Degree is 5-7A/dm2, time 3-5min, so that degreasing is removed, when electrochemical degreasing, in addition to having the saponification of electrochemical deoiling and cream
Change effect is outer, and also under the function of current, just hydrogen or oxygen is precipitated in piece surface.Their bubble becomes larger, by film from
Internal lacerations take on liquid level, and play stirring action to solution, and greasy dirt is accelerated to be detached from the speed of piece surface, so, electrification
Oil removing is more more effective than electrochemical deoiling, and cylinder sleeve is being in no greasy dirt state through electrochemical degreasing rear surface, but in reality
In industrial environment, there is also oxide skins and rusty stain on surface, if being that cannot obtain complete phosphating coat without acid pickling and rust removing,
Therefore, processing of rust removing need to be carried out to cylinder liner internal wall using mordant, derusting temperature is 50-80 DEG C, time 0.5-
1min；
S3, chromium plating: the cylinder jacket after step S2 processing of rust removing is first immersed to 2- in the room temperature soda ash aqueous solution of 0.2-1%
In 3min and raffinate, then will first scheme to go up strippable anti-plated coating except other positions of cylinder liner internal wall, later by cylinder jacket
It is radially clamped, cylinder jacket is slowly protruded into chrome-plating bath, being totally submerged to cylinder jacket can open with electroplate liquid by clip
Beginning electroplating processes, electroplating temperature is 50-55 DEG C, current density 40-50A/dm2, time 3.5-4.5h；
S4, dehydrogenation heat treatment: the cylinder jacket after the completion of chromium plating in step S3 is successively washed through subcooled water, hot water wash and drying
Chromium plating after drying, is then placed in 180-200 DEG C of drying box and heats 1.5-2h, can be completed and remove to cylinder jacket by processing
Hydrogen heat treatment is mainly discharged most of hydrogen that remains, reduces the brittleness of workpiece, improve its fatigue strength, meanwhile, heat treatment
The associativity between coating and parent metal can also be improved, when parent metal bears pressure distortion, coating has good deformation
Adaptability is unlikely to that peeling phenomenon occurs；
S5, porosity: by the anode of the cylinder jacket access electrolytic cell after step S4 dehydrogenation, chrome plating is by backward current
Effect starts rush of current 1.5-2min, and current density is 2 times of normal anode, except the oxide film to dechromise above, porosity
Cylinder jacket is transferred in service sink after the completion and successively carries out cold rinse and thermal cleaning, finally carries out drying and processing, to complete
The advantages of porosity of cylinder jacket is handled, hard chromium is that surface is hard and fine and close smooth, and such property is conducive to have preferable
Wearability, although also having crackle in hard chrome layer surface, depth and width are all little.Lubricating oil, thus lubricity can not be stored
Difference.And the coating used under severe conditions, such as with the cylinder sleeve of heavy load mechanical friction, it is necessary to there is good lubricity,
To reduce coefficient of friction.Spongy chromium plating can be such that original crack widens, and clearly pattern cracking is presented in surface, become trench pine
These rills of hole chrome layer or deep hole can store lubricating oil well, guarantee good lubrication during the work time, substantially reduce
The abrasion of piece surface.Therefore it is handled using porosity, the service life of part can be greatly improved；
S6, inspection of coating: the inner wall of the cylinder jacket after the completion of the processing of step S5 porosity is carried out by detection device respectively
The detection of reticulate pattern density, coating hardness, binding force and thickness of coating, and whether analysis detection result is qualified, if qualification
Complete the spongy chromium plating treatment process of cylinder jacket.
Preferably, grinding can eliminate cylinder sleeve inner wall scratch, scratch, impression manufacturing deficiency and casting in the step S1
Defect.
Preferably, the constitutive material of electrochemical degreasing liquid according to weight ratio part includes: sodium hydroxide 25- in the step S2
35 parts, 20-30 parts of sodium carbonate, 25-35 parts of tertiary sodium phosphate and 1-5 parts of sodium metasilicate.
In addition plus corrosion inhibitor 0.5-1% preferably, mordant is sulfuric acid using 15-20% in the step S2, if
Fourth, if the effect of corrosion inhibiter fourth is: its Molecular Adsorption prevents erosion of the acid to parent metal in base metal surface.
Preferably, in the step S3 electroplate liquid constitutive material according to weight ratio part include: 245-255 parts of CrO3,
2-2.5 parts and Cr3+2-4 parts of H2SO4.
Preferably, in the step S5 porosity handle document be 45-55 DEG C, current density 40-50A/dm2, and locate
The reason time is 10-11min.
(3) beneficial effect
The present invention provides a kind of cylinder liner internal wall spongy chromium plating techniques.Have compared with prior art following beneficial to effect
Fruit:
(1), cylinder liner internal wall spongy chromium plating technique, by specifically includes the following steps: S1, grinding: passing through first
Milling apparatus carries out grinding 15-25min to the inner wall of cylinder jacket to be processed, until cylinder jacket corner part fillet to be processed
Size is kept uniformly, and without any visible scratch, S2, degreasing and rust removal processing: the cylinder jacket after step S1 gasoline oil removing is turned
It moves in electrolytic cell, under the function of current, using cylinder sleeve as cathode or anode, is placed in electrochemical degreasing liquid and is electrolysed,
Electrolysis temperature is 80-90 DEG C, current density 5-7A/dm2, time 3-5min, S3, chromium plating: first by step S2 processing of rust removing
Rear cylinder jacket immerses in the room temperature soda ash aqueous solution of 0.2-1% in 2-3min and raffinate, then by remove cylinder liner internal wall its
Upper strippable anti-plated coating is first schemed at his position, later radially clamps cylinder jacket by clip, cylinder jacket is slowly protruded into
In chrome-plating bath, S4, dehydrogenation heat treatment: the cylinder jacket after the completion of chromium plating in step S3 is successively washed through subcooled water, hot water wash and dry
Then chromium plating after drying is placed in 180-200 DEG C of drying box and heats 1.5-2h, can be completed to cylinder jacket by dry processing
Dehydrogenation heat treatment, S5, porosity: by the anode of the cylinder jacket access electrolytic cell after step S4 dehydrogenation, chrome plating is by reverse electricity
The effect of stream starts rush of current 1.5-2min, and current density is 2 times of normal anode, to remove the oxide film to dechromise above,
S6, inspection of coating: by step S5 porosity processing after the completion of cylinder jacket inner wall respectively by detection device carry out reticulate pattern density,
The detection of coating hardness, binding force and thickness of coating, and whether analysis detection result is qualified, if cylinder jacket can be completed in qualification
Spongy chromium plating processing work, it can be achieved that by being optimized to cylinder jacket spongy chromium plating treatment process, to simplify cylinder jacket porosity
The treatment process of chromium plating has achieved the purpose that not only quickly but also efficiently to carry out the processing of cylinder jacket spongy chromium plating well, subtract significantly
The light work load of producers, simplifies the procedure of processing of spongy chromium plating technique, and improve spongy chromium plating well
Effect without spending producers to carry out the spongy chromium plating processing of cylinder jacket a large amount of time, while also saving manufacturing enterprise
Production cost, the working efficiency of producers is improved, to greatly facilitate the spongy chromium plating of the cylinder jacket of producers
Handle work.
(2), the cylinder liner internal wall spongy chromium plating technique carries out removing for cylinder-barrel surface by using electrochemical degreasing method
Oil processing quickly removes the grease of cylinder-barrel surface, it can be achieved that instead of existing oil removing mode, while avoiding well to gas
The some dead angles of cylinder sleeve cannot fine oil removal treatment the problem of, to ensure that the success rate of cylinder jacket chromium plating process.
Detailed description of the invention
Fig. 1 is flow chart of the invention；
Fig. 2 is the formula table figure of electrochemical degreasing liquid of the present invention；
Fig. 3 is the formula table figure of electroplate liquid of the present invention；
Fig. 4 is test experience reticulate pattern density rating table figure of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1-4 is please referred to, the embodiment of the present invention provides a kind of three kinds of technical solutions: cylinder liner internal wall spongy chromium plating technique,
Specifically include following embodiment:
Embodiment 1
S1, grinding: carrying out grinding 20min by inner wall of the milling apparatus to cylinder jacket to be processed first, until wait locate
The size of qi-regulating cylinder sleeve corner part fillet is kept uniformly, without any visible scratch, then by the cylinder after milled processed
Set is rinsed processing by flushing device, and then cylinder is mounted in the slot for filling solvent again, dips in solvent brushing with brush
Cylinder sleeve surface can hold the characteristics of solving grease using gasoline, remove the mineral grease being attached on cylinder sleeve surface, the side of oil removing
Method is cylinder sleeve, and grinding can eliminate cylinder sleeve inner wall scratch, scratch, impression manufacturing deficiency and casting flaw；
S2, degreasing and rust removal processing: the cylinder jacket after step S1 gasoline oil removing is transferred in electrolytic cell, in the function of current
Under, it using cylinder sleeve as cathode or anode, is placed in electrochemical degreasing liquid and is electrolysed, electrolysis temperature is 85 DEG C, current density
For 6A/dm2, time 4min, to remove degreasing, cylinder sleeve is being in no greasy dirt shape through electrochemical degreasing rear surface
State, but in real industrial environment, there is also oxide skins and rusty stain on surface, therefore, need to be using mordant to cylinder liner internal wall
Processing of rust removing is carried out, derusting temperature is 65 DEG C, and time 0.7min, the constitutive material of electrochemical degreasing liquid is according to weight ratio
It part include: 30 parts of sodium hydroxide, 25 parts of sodium carbonate, 30 parts of tertiary sodium phosphate and 3 parts of sodium metasilicate, mordant is the sulphur using 17%
Acid, if in addition plus the fourth of corrosion inhibitor 0.7%；
S3, chromium plating: the cylinder jacket after step S2 processing of rust removing is first immersed to 2.5min in 0.6% room temperature soda ash aqueous solution
Raffinate is neutralized, then by except upper strippable anti-plated coating is first schemed in other positions of cylinder liner internal wall, is later passed through cylinder jacket
Clip radially clamps, and cylinder jacket is slowly protruded into chrome-plating bath, is totally submerged to cylinder jacket and can start electricity in electroplate liquid
Plating, electroplating temperature is 53 DEG C, current density 45A/dm2, and time 4h, the constitutive material of electroplate liquid is according to weight ratio part
It include: 250 parts of CrO3,2.3 parts and Cr3+3 parts of H2SO4；
S4, dehydrogenation heat treatment: the cylinder jacket after the completion of chromium plating in step S3 is successively washed through subcooled water, hot water wash and drying
Chromium plating after drying, is then placed in 190 DEG C of drying box and heats 1.7h, can be completed at the dehydrogenation heat to cylinder jacket by processing
Reason；
S5, porosity: by the anode of the cylinder jacket access electrolytic cell after step S4 dehydrogenation, chrome plating is by backward current
Effect starts rush of current 1.7min, and current density is 2 times of normal anode, with except the oxide film to dechromise above, porosity is complete
Cylinder jacket is transferred in service sink after and successively carries out cold rinse and thermal cleaning, finally carries out drying and processing, to complete gas
The porosity of cylinder sleeve is handled, and the document of porosity processing is 50 DEG C, current density 45A/dm2, and handling the time is 10.5min；
S6, inspection of coating: the inner wall of the cylinder jacket after the completion of the processing of step S5 porosity is carried out by detection device respectively
The detection of reticulate pattern density, coating hardness, binding force and thickness of coating, and whether analysis detection result is qualified, if qualification
Complete the spongy chromium plating treatment process of cylinder jacket.
Embodiment 2
S1, grinding: carrying out grinding 15min by inner wall of the milling apparatus to cylinder jacket to be processed first, until wait locate
The size of qi-regulating cylinder sleeve corner part fillet is kept uniformly, without any visible scratch, then by the cylinder after milled processed
Set is rinsed processing by flushing device, and then cylinder is mounted in the slot for filling solvent again, dips in solvent brushing with brush
Cylinder sleeve surface can hold the characteristics of solving grease using gasoline, remove the mineral grease being attached on cylinder sleeve surface, the side of oil removing
Method is cylinder sleeve, and grinding can eliminate cylinder sleeve inner wall scratch, scratch, impression manufacturing deficiency and casting flaw；
S2, degreasing and rust removal processing: the cylinder jacket after step S1 gasoline oil removing is transferred in electrolytic cell, in the function of current
Under, it using cylinder sleeve as cathode or anode, is placed in electrochemical degreasing liquid and is electrolysed, electrolysis temperature is 80 DEG C, current density
For 5A/dm2, time 3min, to remove degreasing, cylinder sleeve is being in no greasy dirt shape through electrochemical degreasing rear surface
State, but in real industrial environment, there is also oxide skins and rusty stain on surface, therefore, need to be using mordant to cylinder liner internal wall
Processing of rust removing is carried out, derusting temperature is 50 DEG C, and time 0.5min, the constitutive material of electrochemical degreasing liquid is according to weight ratio
It part include: 25 parts of sodium hydroxide, 20 parts of sodium carbonate, 25 parts of tertiary sodium phosphate and 1 part of sodium metasilicate, mordant is the sulphur using 15%
Acid, if in addition plus the fourth of corrosion inhibitor 0.5%；
S3, chromium plating: first the cylinder jacket after step S2 processing of rust removing is immersed in 0.2% room temperature soda ash aqueous solution in 2min
And cylinder jacket is passed through folder later then by except upper strippable anti-plated coating is first schemed in other positions of cylinder liner internal wall by raffinate
Son radially clamps, and cylinder jacket is slowly protruded into chrome-plating bath, is totally submerged to cylinder jacket and can start to be electroplated in electroplate liquid
Processing, electroplating temperature is 50 DEG C, current density 40A/dm2, and time 3.5h, the constitutive material of electroplate liquid is according to weight ratio part
It include: 245 parts of CrO3,2 parts and Cr3+2 parts of H2SO4；
S4, dehydrogenation heat treatment: the cylinder jacket after the completion of chromium plating in step S3 is successively washed through subcooled water, hot water wash and drying
Chromium plating after drying, is then placed in 180 DEG C of drying box and heats 1.5h, can be completed at the dehydrogenation heat to cylinder jacket by processing
Reason；
S5, porosity: by the anode of the cylinder jacket access electrolytic cell after step S4 dehydrogenation, chrome plating is by backward current
Effect starts rush of current 1.5min, and current density is 2 times of normal anode, with except the oxide film to dechromise above, porosity is complete
Cylinder jacket is transferred in service sink after and successively carries out cold rinse and thermal cleaning, finally carries out drying and processing, to complete gas
The porosity of cylinder sleeve is handled, and the document of porosity processing is 45 DEG C, current density 40A/dm2, and handling the time is 10min；
S6, inspection of coating: the inner wall of the cylinder jacket after the completion of the processing of step S5 porosity is carried out by detection device respectively
The detection of reticulate pattern density, coating hardness, binding force and thickness of coating, and whether analysis detection result is qualified, if qualification
Complete the spongy chromium plating treatment process of cylinder jacket.
Embodiment 3
S1, grinding: carrying out grinding 25min by inner wall of the milling apparatus to cylinder jacket to be processed first, until wait locate
The size of qi-regulating cylinder sleeve corner part fillet is kept uniformly, without any visible scratch, then by the cylinder after milled processed
Set is rinsed processing by flushing device, and then cylinder is mounted in the slot for filling solvent again, dips in solvent brushing with brush
Cylinder sleeve surface can hold the characteristics of solving grease using gasoline, remove the mineral grease being attached on cylinder sleeve surface, the side of oil removing
Method is cylinder sleeve, and grinding can eliminate cylinder sleeve inner wall scratch, scratch, impression manufacturing deficiency and casting flaw；
S2, degreasing and rust removal processing: the cylinder jacket after step S1 gasoline oil removing is transferred in electrolytic cell, in the function of current
Under, it using cylinder sleeve as cathode or anode, is placed in electrochemical degreasing liquid and is electrolysed, electrolysis temperature is 90 DEG C, current density
For 7A/dm2, time 5min, to remove degreasing, cylinder sleeve is being in no greasy dirt shape through electrochemical degreasing rear surface
State, but in real industrial environment, there is also oxide skins and rusty stain on surface, therefore, need to be using mordant to cylinder liner internal wall
Processing of rust removing is carried out, derusting temperature is 80 DEG C, time 1min, and the constitutive material of electrochemical degreasing liquid is according to weight ratio part
It include: 35 parts of sodium hydroxide, 30 parts of sodium carbonate, 35 parts of tertiary sodium phosphate and 5 parts of sodium metasilicate, mordant is the sulfuric acid using 20%,
In addition plus the fourth of corrosion inhibitor 1% if；
S3, chromium plating: the cylinder jacket after step S2 processing of rust removing is first immersed to 3min in 1% room temperature soda ash aqueous solution and is neutralized
Cylinder jacket is passed through clip later then by except upper strippable anti-plated coating is first schemed in other positions of cylinder liner internal wall by raffinate
It radially clamps, cylinder jacket is slowly protruded into chrome-plating bath, being totally submerged to cylinder jacket can start at plating with electroplate liquid
Reason, electroplating temperature is 55 DEG C, current density 50A/dm2, time 4.5h, and the constitutive material of electroplate liquid is wrapped according to weight ratio part
It includes: 255 parts, H2SO42.5 parts and Cr3+4 parts of CrO3；
S4, dehydrogenation heat treatment: the cylinder jacket after the completion of chromium plating in step S3 is successively washed through subcooled water, hot water wash and drying
Chromium plating after drying, is then placed in 200 DEG C of drying box and heats 2h, can be completed at the dehydrogenation heat to cylinder jacket by processing
Reason；
S5, porosity: by the anode of the cylinder jacket access electrolytic cell after step S4 dehydrogenation, chrome plating is by backward current
Effect starts rush of current 2min, and current density is 2 times of normal anode, with except the oxide film to dechromise above, porosity is completed
Cylinder jacket is transferred in service sink afterwards and successively carries out cold rinse and thermal cleaning, finally carries out drying and processing, to complete cylinder
The porosity of set is handled, and the document of porosity processing is 55 DEG C, current density 50A/dm2, and handling the time is 11min；
S6, inspection of coating: the inner wall of the cylinder jacket after the completion of the processing of step S5 porosity is carried out by detection device respectively
The detection of reticulate pattern density, coating hardness, binding force and thickness of coating, and whether analysis detection result is qualified, if qualification
Complete the spongy chromium plating treatment process of cylinder jacket.
Test experience
Certain cylinder jacket manufacturing enterprise respectively obtains three groups of spongy chromium plating processing using the treatment process of 1-3 of the embodiment of the present invention
Then cylinder jacket afterwards carries out reticulate pattern density, coating hardness, combination by detection device respectively to the inner wall of this three groups of cylinder jacket
The detection of power and thickness of coating, and whether analysis detection result is qualified.
The profit oiliness of general chromium plating layer surface is poor, it is difficult to form uniform lubricating oil film, spongy chromium plating layer surface has
Fine and closely woven, uniform, the suitably irregular reticulate pattern of depth that naked eyes are difficult to see at present may be used with guaranteeing the favorable lubricating property on surface
To be divided into five grades of A, B, C, D, E, the method for classification shoots the 100X metallograph of sample, photo is placed in 1000mm2
In grid, grid number therein is calculated, standard such as table 4, the grid number in two class unit area of D, E is very little, be easy to cause cylinder sleeve
Inner surface is pulled, and A, B, C three classes meet requirement, shows embodiment 1-3 through test experience structure treated in cylinder jacket
The grid number of wall is greater than 180, therefore reticulate pattern density meets the requirements.
The hardness of coating is measured with micro Vickers simultaneously, the microhardness value of embodiment 1-3 coating is not less than
800HV。
With the binding force of hammering method qualitative test chrome layer, carried out in layers of chrome and metal attachment checking machine, cylinder
It is placed under weight, hammer quality is 1kg, is freely fallen at away from inspection object 150mm, hammering end face is primary, must not add external force, also
It must not repeat to hammer primary.Qualified or not determination method are as follows: layers of chrome is not fallen off with matrix cast iron, qualified；Layers of chrome and matrix are cast
Iron falls off simultaneously, qualified；Layers of chrome falls off one layer, but still has chromium to cement with matrix cast iron, qualified；Layers of chrome is all de- from matrix cast iron
It falls, unqualified, the layers of chrome of 1-3 of embodiment of the present invention processing exhaust hood set is not fallen off with matrix cast iron, therefore qualified.
By embodiment 1-3 treated cylinder jacket in the thickness of metallography microscope microscopic observation film, chrome plating thickness is all larger than
0.10mm, therefore, thickness of coating meet the requirements.
In summary
The present invention can be achieved by optimizing to cylinder jacket spongy chromium plating treatment process, to simplify cylinder jacket spongy chromium plating
Treatment process, achieved the purpose that well not only quickly but also it is efficient carry out the processing of cylinder jacket spongy chromium plating, significantly reduce
The work load of producers, simplifies the procedure of processing of spongy chromium plating technique well, and improves spongy chromium plating effect,
Without spending producers to carry out the spongy chromium plating processing of cylinder jacket a large amount of time, while also saving the production of manufacturing enterprise
Cost, improves the working efficiency of producers, to greatly facilitate the spongy chromium plating processing work of the cylinder jacket of producers
Make.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (6)
1. a kind of cylinder liner internal wall spongy chromium plating technique, it is characterised in that: specifically includes the following steps:
S1, grinding: carrying out grinding 15-25min by inner wall of the milling apparatus to cylinder jacket to be processed first, until to be processed
The size of cylinder jacket corner part fillet is kept uniformly, without any visible scratch, then by the cylinder jacket after milled processed
It is rinsed processing by flushing device, then cylinder is mounted in the slot for filling solvent again, dips in solvent brushing vapour with brush
Cylinder liner surface can hold the characteristics of solving grease using gasoline, remove the mineral grease being attached on cylinder sleeve surface, the method for oil removing
It is cylinder sleeve；
S2, degreasing and rust removal processing: the cylinder jacket after step S1 gasoline oil removing is transferred in electrolytic cell, will under the function of current
Cylinder sleeve as cathode or anode, be placed in electrochemical degreasing liquid and be electrolysed, electrolysis temperature is 80-90 DEG C, and current density is
5-7A/dm2, time 3-5min, to remove degreasing, cylinder sleeve is being in no greasy dirt shape through electrochemical degreasing rear surface
State, but in real industrial environment, there is also oxide skins and rusty stain on surface, therefore, need to be using mordant to cylinder liner internal wall
Processing of rust removing is carried out, derusting temperature is 50-80 DEG C, time 0.5-1min；
S3, chromium plating: first the cylinder jacket after step S2 processing of rust removing is immersed in the room temperature soda ash aqueous solution of 0.2-1% in 2-3min
And cylinder jacket is passed through folder later then by except upper strippable anti-plated coating is first schemed in other positions of cylinder liner internal wall by raffinate
Son radially clamps, and cylinder jacket is slowly protruded into chrome-plating bath, is totally submerged to cylinder jacket and can start to be electroplated in electroplate liquid
Processing, electroplating temperature is 50-55 DEG C, current density 40-50A/dm2, time 3.5-4.5h；
S4, dehydrogenation heat treatment: the cylinder jacket after the completion of chromium plating in step S3 is successively washed through subcooled water, at hot water wash and drying
Chromium plating after drying, is then placed in 180-200 DEG C of drying box and heats 1.5-2h, the dehydrogenation to cylinder jacket can be completed by reason
Heat treatment；
S5, porosity: by the anode of the cylinder jacket access electrolytic cell after step S4 dehydrogenation, work of the chrome plating by backward current
With beginning rush of current 1.5-2min, current density is 2 times of normal anode, with except the oxide film to dechromise above, porosity is complete
Cylinder jacket is transferred in service sink after and successively carries out cold rinse and thermal cleaning, finally carries out drying and processing, to complete gas
The porosity of cylinder sleeve is handled；
S6, inspection of coating: the inner wall of the cylinder jacket after the completion of the processing of step S5 porosity is passed through into detection device respectively and carries out reticulate pattern
The detection of density, coating hardness, binding force and thickness of coating, and whether analysis detection result is qualified, if qualification can be completed
The spongy chromium plating treatment process of cylinder jacket.
2. a kind of cylinder liner internal wall spongy chromium plating technique according to claim 1, it is characterised in that: ground in the step S1
Mill can eliminate cylinder sleeve inner wall scratch, scratch, impression manufacturing deficiency and casting flaw.
3. a kind of cylinder liner internal wall spongy chromium plating technique according to claim 1, it is characterised in that: electric in the step S2
The constitutive material of chemical degreasing liquid includes: 25-35 parts of sodium hydroxide, 20-30 parts of sodium carbonate, tertiary sodium phosphate according to weight ratio part
25-35 parts and sodium metasilicate 1-5 parts.
4. a kind of cylinder liner internal wall spongy chromium plating technique according to claim 1, it is characterised in that: sour in the step S2
In addition plus the fourth of corrosion inhibitor 0.5-1% lotion is the sulfuric acid using 15-20%, if.
5. a kind of cylinder liner internal wall spongy chromium plating technique according to claim 1, it is characterised in that: electric in the step S3
The constitutive material of plating solution includes: 245-255 parts of CrO3,2-2.5 parts of H2SO4 and 2-4 parts of Cr3+ according to weight ratio part.
6. a kind of cylinder liner internal wall spongy chromium plating technique according to claim 1, it is characterised in that: loose in the step S5
Hole processing document be 45-55 DEG C, current density 40-50A/dm2, and handle the time be 10-11min.
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| CN201910686753.5A CN110273169A (en) | 2019-07-29 | 2019-07-29 | A kind of cylinder liner internal wall spongy chromium plating technique |
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Application publication date: 20190924 |