CN109881239A - A kind of part electrophoresis coating technique - Google Patents
A kind of part electrophoresis coating technique Download PDFInfo
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- CN109881239A CN109881239A CN201910153864.XA CN201910153864A CN109881239A CN 109881239 A CN109881239 A CN 109881239A CN 201910153864 A CN201910153864 A CN 201910153864A CN 109881239 A CN109881239 A CN 109881239A
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Abstract
The present invention relates to technical field of surface, more specifically, it relates to a kind of part electrophoresis coating technique, its key points of the technical solution are that: including pretreatment procedure and electrophoretic process process；The pretreatment procedure successively includes following processing step: ungrease treatment, phosphorating treatment and Passivation Treatment；The ungrease treatment is successively the following steps are included: pre- degreasing spray process, degreasing immersion treatment, main degreasing spray process；The phosphorating treatment is successively the following steps are included: surface adjusts spray process, phosphate immersion treatment；The Passivation Treatment is successively the following steps are included: passivation immersion treatment, first time pure water spray process, second of pure water spray process；The electrophoretic process process successively includes following processing step: anodic electrophoresis processing, hyperfiltration recovery processing, pure water immersion treatment, pure water spray process.A kind of part electrophoresis coating technique of the invention has the advantages that improve auto parts electrophoretic painting quality.
Description
Technical field
The present invention relates to technical field of surface, more specifically, it relates to a kind of part electrophoresis coating technique.
Background technique
Auto parts process of surface treatment mainly has the modes such as nigrescence, plating and electrophoresis at present, and due to blacking and being electroplated
Processing is typically not capable of salt spray test standard as defined in automobile factory, and the auto parts and components for supplying automobile factory are mostly using electrophoresis work
Skill is surface-treated, and electrophoresis is divided into anodic electrophoresis and two kinds of ability cathode electrophoresis.
In existing electrophoresis process, under the premise of pursuing more low energy consumption, more low pollution, the paint of raising electrophoretic paint as far as possible is attached
Rate, improve salt spray resistance ability, be the target that those skilled in the art constantly pursue.Existing technique is during processing still
It needs further to be promoted.
Summary of the invention
In view of the deficiencies of the prior art, the present invention intends to provide a kind of part electrophoresis coating technique, have
The advantages of improving auto parts electrophoretic painting quality.
Above-mentioned technical purpose of the invention has the technical scheme that a kind of part electrophoretic painting work
Skill, including pretreatment procedure and electrophoretic process process；
The pretreatment procedure successively includes following processing step: ungrease treatment, phosphorating treatment and Passivation Treatment；
The ungrease treatment successively the following steps are included:
Degreaser is sprayed by spray equipment and is carried out at pre- degreasing spray on auto parts surface by S01, pre- degreasing spray process
Reason, degreaser is to be watered to be made by degreasing agent, and the free alkalinity of degreaser is 20~30pt, and the temperature of degreaser is 35~45
DEG C, spray pressure is 0.06~0.1Mpa, spray time 2min;
Auto parts after pre- degreasing spray process are immersed in the degreasing bath for filling degreaser and are carried out by SO2, degreasing immersion treatment
Degreasing immersion treatment, the free alkalinity of degreaser are 20~30pt, and the temperature of degreaser is 40~50 DEG C, soaking time 4
min24s;
S03, main degreasing spray process are sprayed degreaser on the auto parts surface after degreasing is impregnated by spray equipment
Main degreasing spray process is carried out, the free alkalinity of degreaser is 20~30pt, and the temperature of degreaser is 40~50 DEG C, spray pressure
For 0.05~0.11Mpa, spray time 2min;
Auto parts after ungrease treatment are washed away the oil on auto parts surface by S04, water purification cleaning treatment by water purification
Object；
The phosphorating treatment successively the following steps are included:
S11, surface adjust spray process, and surface is adjusted liquid spray by spray equipment and carries out surface tune on auto parts surface
Whole spray process, the pH value that surface adjusts liquid is 8~10, and spray pressure is 0.05~0.11Mpa, spray time 1min24s；
S12, phosphate immersion treatment, the auto parts after surface to be adjusted to spray process enter the Phosphating Slot for filling phosphating solution
Middle progress phosphate immersion treatment, the free acidity of phosphating solution are 0.5~1.3pt, and the temperature of phosphating solution is 30~40 DEG C, leaching
The bubble time is 5min12s;
S13, water purification spray process are carried out the auto parts after phosphate immersion treatment at water purification spray by spray equipment
Reason, spray pressure are 0.04~0.08Mpa, spray time 1min36s;
Auto parts after water purification spray process are immersed and carry out water purification immersion treatment in clean water tank by S14, water purification immersion treatment,
Soaking time is 5min12s；
The Passivation Treatment successively the following steps are included:
S21 is passivated immersion treatment, auto parts is put into the deactivation slot for fill passivating solution and are passivated immersion treatment, impregnates
Time is 2min36s；
Auto parts after being passivated immersion treatment are carried out first time spray by spray equipment by S22, first time pure water spray process
Pure water spray process is drenched, spray pressure is 0.04~0.08Mpa, and spray time 1min12s sprays the conductance of the pure water of collection
Rate is less than 200 μ s/cm；
Auto parts after first time pure water spray process are carried out the by spray equipment by S23, second of pure water spray process
Second pure water spray process, spray pressure are 0.05~0.11Mpa, spray time 1min24s, the pure water collected after spray
Conductivity is less than 50 μ s/cm；
The electrophoretic process process successively includes following processing step:
Auto parts are immersed and carry out anodic electrophoresis processing, electrophoresis in the electrophoresis tank for filling electrophoresis liquid by S31, anodic electrophoresis processing
The pH value of liquid is 5.5~5.9, and the pigment of electrophoresis liquid is 10%~12%, and the solid ingredient of electrophoresis liquid is 11%~15%, electricity
The conductivity of swimming liquid is 1100~1500 μ s/cm, and the temperature of electrophoresis liquid is 28~32 DEG C, operating voltage 200V, electrophoresis time
For 4min；
S32, hyperfiltration recovery processing, cleans the auto parts after electrophoretic process by ultrafilter and recycles electrophoresis
Liquid；
S33, pure water immersion treatment, the auto parts after hyperfiltration is recycled, which immerse in pure water slot, to carry out at pure water immersion
Reason, soaking time 2min24s；
Auto parts after pure water immersion treatment are carried out pure water spray process by spray equipment by S34, pure water spray process,
Spray pressure is 0.02~0.08Mpa, spray time 1min36s.
By using above-mentioned technical proposal, auto parts remove surface grease by ungrease treatment process, to improve phosphorus
Change the quality of phosphating coat in treatment process, then by Passivation Treatment, further increases the adhesion of phosphating coat electrophoretic painting
Can, then by the anodic electrophoresis processing in electrophoretic process process, to improve the electrophoretic paint adhesive force on auto parts, in turn
Improve the quality of auto parts electrophoretic painting.
The present invention is further arranged to: the water purification cleaning treatment includes first time water purification spray process, at water purification immersion
Reason and second of water purification spray process, the spray pressure of the first water purification spray process are 0.04~0.08Mpa, when spray
Between be 1min12s；The time of water purification immersion treatment is 2min24s；The spray pressure of second of water purification spray process be 0.05~
0.11Mpa, spray time 1min12s.
By using above-mentioned technical proposal, after the completion of auto parts ungrease treatment, first passes through the first water purification spray and carry out just
Step cleaning, then again by water purification soaking and washing, finally again by second of water purification spray cleaning, so that automobile zero will be remained in
Grease on part surface more thoroughly cleans up, to improve the clean level on auto parts surface.
The present invention is further arranged to: the degreasing bath in the degreasing immersion treatment step is carried out by the way of ultrasonic wave
Ungrease treatment.
By using above-mentioned technical proposal, degreasing immersion treatment is carried out by way of ultrasonic wave, to further increase
The efficiency of auto parts soak degreasing.
The present invention is further arranged to: being added with promotor in the phosphating solution of the phosphate immersion treatment step, is promoted
Concentration into agent is 1~3pt.
By using above-mentioned technical proposal, by adding promotor in phosphating solution, to accelerate auto parts phosphating coat
Formation.
The present invention is further arranged to: the passivating solution in the passivation immersion treatment step is using at non-chromium passivating solution
Reason.
By using above-mentioned technical proposal, the processing of non-chromium passivating solution can reduce the pollution to environment.
The present invention is further arranged to: described three sections of hyperfiltration recovery processing point are successively handled, three processing times
It is 1min, the conductivity for the liquid collected in final stage hyperfiltration recovery processing is 600~1000 μ s/cm.
By using above-mentioned technical proposal, it is recycled by three sections of hyperfiltration, thus more thoroughly by auto parts
On floating paint clean up, and floating Qi Jinhang recycling and reusing is economized on resources to reduce environmental pollution.
The present invention is further arranged to: further including processing of dripping in the electrophoretic process process, after pure water spray process
Auto parts be placed in area of dripping and carry out processing of dripping, the time of dripping is 2min24s.
By using above-mentioned technical proposal, water spray will be blown treated auto parts it is placed on area of dripping and carry out place of dripping
Reason, reduces the moisture on auto parts, facilitates subsequent operation.
The present invention is further arranged to: accelerating the air to drip in area by screw air compressor in the processing step of dripping
Flow velocity.
By using above-mentioned technical proposal, accelerated to drip the air velocity in area by screw air compressor, to improve automobile
The water loss of piece surface.
The present invention is further arranged to: it further include drying and processing in the electrophoretic process process, the vapour that will drip that treated
Vehicle part, which is put into oven, carries out drying and processing, and baking temperature is 180~200 DEG C, baking time 31min.
By using above-mentioned technical proposal, by dripping that treated, auto parts placement is toasted in an oven, from
And thoroughly the moisture on auto parts surface is evaporated.
The present invention is further arranged to: in the oven in the drying and processing step in such a way that combustor cooperates blower
Carry out drying and processing.
By using above-mentioned technical proposal, combustor cooperates the mode of blower, accelerates the evaporation of auto parts surface moisture.
In conclusion the invention has the following advantages: auto parts by ungrease treatment process remove surface grease,
To improve the quality of phosphating coat in Phosphating Treatment Process, then by Passivation Treatment, the painting of phosphatization membrane electrophoresis is further increased
The adhesion property of dress, then by the anodic electrophoresis processing in electrophoretic process process, to improve the electrophoretic paint on auto parts
Adhesive force, and then improve the quality of auto parts electrophoretic painting.
Specific embodiment
Following example, the present invention will be described in detail.
A kind of part electrophoresis coating technique, including pretreatment procedure and electrophoretic process process；
Pretreatment procedure successively includes following processing step: ungrease treatment, phosphorating treatment and Passivation Treatment；
Ungrease treatment successively the following steps are included:
Degreaser is sprayed by spray equipment and is carried out at pre- degreasing spray on auto parts surface by S01, pre- degreasing spray process
Reason, spray equipment is by the way of spray room and circulated sprinkling.Degreaser is to be watered to be made by degreasing agent, and degreaser dissociates
Basicity is 20~30pt, and the temperature of degreaser is 35~45 DEG C, and spray pressure is 0.06~0.1Mpa, spray time 2min;
Auto parts after pre- degreasing spray process are immersed in the degreasing bath for filling degreaser and are carried out by SO2, degreasing immersion treatment
Degreasing immersion treatment, the free alkalinity of degreaser are 20~30pt, and the temperature of degreaser is 40~50 DEG C, soaking time 4
min24s;Wherein the auto parts in auto parts degreasing immersion treatment step carry out degreasing immersion by the way of ultrasonic wave.
S03, main degreasing spray process are sprayed degreaser in the auto parts after degreasing is impregnated by spray equipment
Surface carries out main degreasing spray process, and the free alkalinity of degreaser is 20~30pt, and the temperature of degreaser is 40~50 DEG C, spray
Pressure is 0.05~0.11Mpa, spray time 2min;
Auto parts after ungrease treatment are washed away the oil on auto parts surface by S04, water purification cleaning treatment by water purification
Object；
Phosphorating treatment successively the following steps are included:
S11, surface adjust spray process, and surface is adjusted liquid spray by spray equipment and carries out surface tune on auto parts surface
Whole spray process, the pH value that surface adjusts liquid is 8~10, and spray pressure is 0.05~0.11Mpa, spray time 1min24s；
S12, phosphate immersion treatment, the auto parts after surface to be adjusted to spray process enter the Phosphating Slot for filling phosphating solution
Middle progress phosphate immersion treatment, the free acidity of phosphating solution are 0.5~1.3pt, and the temperature of phosphating solution is 30~40 DEG C, leaching
The bubble time is 5min12s;
S13, water purification spray process are carried out the auto parts after phosphate immersion treatment at water purification spray by spray equipment
Reason, spray pressure are 0.04~0.08Mpa, spray time 1min36s;
Auto parts after water purification spray process are immersed and carry out water purification immersion treatment in clean water tank by S14, water purification immersion treatment,
Soaking time is 5min12s；
Passivation Treatment successively the following steps are included:
S21 is passivated immersion treatment, auto parts is put into the deactivation slot for fill passivating solution and are passivated immersion treatment, impregnates
Time is 2min36s；
Auto parts after being passivated immersion treatment are carried out first time spray by spray equipment by S22, first time pure water spray process
Pure water spray process is drenched, spray pressure is 0.04~0.08Mpa, and spray time 1min12s sprays the conductance of the pure water of collection
Rate is less than 200 μ s/cm；
Auto parts after first time pure water spray process are carried out the by spray equipment by S23, second of pure water spray process
Second pure water spray process, spray pressure are 0.05~0.11Mpa, spray time 1min24s, the pure water collected after spray
Conductivity is less than 50 μ s/cm.
Electrophoretic process process successively includes following processing step:
Auto parts are immersed and carry out anodic electrophoresis processing, electrophoresis in the electrophoresis tank for filling electrophoresis liquid by S31, anodic electrophoresis processing
The pH value of liquid is 5.5~5.9, and the pigment of electrophoresis liquid is 10%~12%, and the solid ingredient of electrophoresis liquid is 11%~15%, electricity
The conductivity of swimming liquid is 1100~1500 μ s/cm, and the temperature of electrophoresis liquid is 28~32 DEG C, operating voltage 200V, electrophoresis time
For 4min；
S32, hyperfiltration recovery processing, cleans the auto parts after electrophoretic process by ultrafilter and recycles electrophoresis
Liquid；
S33, pure water immersion treatment, the auto parts after hyperfiltration is recycled, which immerse in pure water slot, to carry out at pure water immersion
Reason, soaking time 2min24s；
Auto parts after pure water immersion treatment are carried out pure water spray process by spray equipment by S34, pure water spray process,
Spray pressure is 0.02~0.08Mpa, spray time 1min36s.
Auto parts remove surface grease by ungrease treatment process, to improve the matter of phosphating coat in Phosphating Treatment Process
Amount further increases the adhesion property of phosphating coat electrophoretic painting then by Passivation Treatment, then passes through electrophoretic process process
In anodic electrophoresis processing, to improve the electrophoretic paint adhesive force on auto parts, and then improve auto parts electrophoretic painting
Quality.
Specifically, water purification cleaning treatment includes first time water purification spray process, water purification immersion treatment and second of water purification
Spray process, the spray pressure of the first water purification spray process are 0.04~0.08Mpa, spray time 1min12s；Water purification
The time of immersion treatment is 2min24s；The spray pressure of second of water purification spray process is 0.05~0.11Mpa, spray time
For 1min12s.After the completion of auto parts ungrease treatment, first passes through the first water purification spray and tentatively cleaned, then again by net
Water soaking and washing, finally again by second of water purification spray cleaning, thus by the grease on auto parts surface is remained in more
It thoroughly cleans up, to improve the clean level on auto parts surface.
Further, it is added with promotor in the phosphating solution of phosphate immersion treatment step, the concentration of promotor is 1~
3pt.By adding promotor in phosphating solution, to accelerate the formation of auto parts phosphating coat.Promotor in the present embodiment
Using nitrate.
Further, the passivating solution being passivated in immersion treatment step is handled using non-chromium passivating solution.Non-chromium passivating solution
Processing can reduce the pollution to environment.
Specifically, three sections of hyperfiltration recovery processing point is successively handled, three processing times are 1min, final stage
The conductivity for the liquid collected in hyperfiltration recovery processing is 600~1000 μ s/cm.It is recycled by three sections of hyperfiltration, from
And more thoroughly clean up the floating paint on auto parts, and by floating Qi Jinhang recycling and reusing, to reduce environment
Pollution, economizes on resources.
Further, further include processing of dripping in electrophoretic process process, the auto parts after pure water spray process are placed
Processing of dripping is carried out in area of dripping, the time of dripping is 2min24s.Water spray will be blown treated auto parts and be placed on and dripped
Area carries out processing of dripping, and reduces the moisture on auto parts, facilitates subsequent operation.Pass through screw air compressing in processing step of dripping
Machine accelerates the air velocity that drips in area, is accelerated to drip the air velocity in area by screw air compressor, to improve auto parts
The water loss on surface.
It further, further include drying and processing in electrophoretic process process, dripping that treated, auto parts are put into oven
Middle carry out drying and processing, baking temperature are 180~200 DEG C, baking time 31min.By the auto parts that drip that treated
Placement is toasted in an oven, to thoroughly evaporate the moisture on auto parts surface.In oven in drying and processing step
Drying and processing is carried out in such a way that combustor cooperates blower.Combustor cooperates the mode of blower, accelerates auto parts surface water
The evaporation divided.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of part electrophoresis coating technique, it is characterised in that: including pretreatment procedure and electrophoretic process process；
The pretreatment procedure successively includes following processing step: ungrease treatment, phosphorating treatment and Passivation Treatment；
The ungrease treatment successively the following steps are included:
Degreaser is sprayed by spray equipment and is carried out at pre- degreasing spray on auto parts surface by S01, pre- degreasing spray process
Reason, degreaser is to be watered to be made by degreasing agent, and the free alkalinity of degreaser is 20~30pt, and the temperature of degreaser is 35~45
DEG C, spray pressure is 0.06~0.1Mpa, spray time 2min;
Auto parts after pre- degreasing spray process are immersed in the degreasing bath for filling degreaser and are carried out by SO2, degreasing immersion treatment
Degreasing immersion treatment, the free alkalinity of degreaser are 20~30pt, and the temperature of degreaser is 40~50 DEG C, soaking time 4
min24s;
S03, main degreasing spray process are sprayed degreaser on the auto parts surface after degreasing is impregnated by spray equipment
Main degreasing spray process is carried out, the free alkalinity of degreaser is 20~30pt, and the temperature of degreaser is 40~50 DEG C, spray pressure
For 0.05~0.11Mpa, spray time 2min;
Auto parts after ungrease treatment are washed away the oil on auto parts surface by S04, water purification cleaning treatment by water purification
Object；
The phosphorating treatment successively the following steps are included:
S11, surface adjust spray process, and surface is adjusted liquid spray by spray equipment and carries out surface tune on auto parts surface
Whole spray process, the pH value that surface adjusts liquid is 8~10, and spray pressure is 0.05~0.11Mpa, spray time 1min24s；
S12, phosphate immersion treatment, the auto parts after surface to be adjusted to spray process enter the Phosphating Slot for filling phosphating solution
Middle progress phosphate immersion treatment, the free acidity of phosphating solution are 0.5~1.3pt, and the temperature of phosphating solution is 30~40 DEG C, leaching
The bubble time is 5min12s;
S13, water purification spray process are carried out the auto parts after phosphate immersion treatment at water purification spray by spray equipment
Reason, spray pressure are 0.04~0.08Mpa, spray time 1min36s;
Auto parts after water purification spray process are immersed and carry out water purification immersion treatment in clean water tank by S14, water purification immersion treatment,
Soaking time is 5min12s；
The Passivation Treatment successively the following steps are included:
S21 is passivated immersion treatment, auto parts is put into the deactivation slot for fill passivating solution and are passivated immersion treatment, impregnates
Time is 2min36s；
Auto parts after being passivated immersion treatment are carried out first time spray by spray equipment by S22, first time pure water spray process
Pure water spray process is drenched, spray pressure is 0.04~0.08Mpa, and spray time 1min12s sprays the conductance of the pure water of collection
Rate is less than 200 μ s/cm；
Auto parts after first time pure water spray process are carried out the by spray equipment by S23, second of pure water spray process
Second pure water spray process, spray pressure are 0.05~0.11Mpa, spray time 1min24s, the pure water collected after spray
Conductivity is less than 50 μ s/cm；
The electrophoretic process process successively includes following processing step:
Auto parts are immersed and carry out anodic electrophoresis processing, electrophoresis in the electrophoresis tank for filling electrophoresis liquid by S31, anodic electrophoresis processing
The pH value of liquid is 5.5~5.9, and the pigment of electrophoresis liquid is 10%~12%, and the solid ingredient of electrophoresis liquid is 11%~15%, electricity
The conductivity of swimming liquid is 1100~1500 μ s/cm, and the temperature of electrophoresis liquid is 28~32 DEG C, operating voltage 200V, electrophoresis time
For 4min；
S32, hyperfiltration recovery processing, cleans the auto parts after electrophoretic process by ultrafilter and recycles electrophoresis
Liquid；
S33, pure water immersion treatment, the auto parts after hyperfiltration is recycled, which immerse in pure water slot, to carry out at pure water immersion
Reason, soaking time 2min24s；
Auto parts after pure water immersion treatment are carried out pure water spray process by spray equipment by S34, pure water spray process,
Spray pressure is 0.02~0.08Mpa, spray time 1min36s.
2. a kind of part electrophoresis coating technique according to claim 1, it is characterised in that: the water purification cleaning treatment includes
First time water purification spray process, water purification immersion treatment and second of water purification spray process, the first water purification spray process
Spray pressure is 0.04~0.08Mpa, spray time 1min12s；The time of water purification immersion treatment is 2min24s；Second
The spray pressure of water purification spray process is 0.05~0.11Mpa, spray time 1min12s.
3. a kind of part electrophoresis coating technique according to claim 1, it is characterised in that: the degreasing immersion treatment step
In degreasing bath ungrease treatment is carried out by the way of ultrasonic wave.
4. a kind of part electrophoresis coating technique according to claim 1, it is characterised in that: the phosphate immersion treatment
Promotor is added in the phosphating solution of step, the concentration of promotor is 1~3pt.
5. a kind of part electrophoresis coating technique according to claim 1, it is characterised in that: the passivation immersion treatment step
In passivating solution using non-chromium passivating solution handle.
6. a kind of part electrophoresis coating technique according to claim 1, it is characterised in that: the hyperfiltration recovery processing point
Three sections are successively handled, and three processing times are 1min, the electricity for the liquid collected in final stage hyperfiltration recovery processing
Conductance is 600~1000 μ s/cm.
7. a kind of part electrophoresis coating technique according to claim 1, it is characterised in that: in the electrophoretic process process also
Including processing of dripping, the auto parts after pure water spray process are placed in area of dripping and carry out processing of dripping, the time of dripping is
2min24s。
8. a kind of part electrophoresis coating technique according to claim 7, it is characterised in that: lead in the processing step of dripping
It crosses screw air compressor and accelerates the air velocity to drip in area.
9. a kind of part electrophoresis coating technique according to claim 1, it is characterised in that: in the electrophoretic process process also
Including drying and processing, the auto parts that will drip that treated, which are put into oven, carries out drying and processing, and baking temperature is 180~200
DEG C, baking time 31min.
10. a kind of part electrophoresis coating technique according to claim 9, it is characterised in that: in the drying and processing step
Oven in combustor cooperate blower by way of carry out drying and processing.
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| CN110552046A (en) * | 2019-09-30 | 2019-12-10 | 常州市骠马工业机器人系统工程有限公司 | Coating process for collinear electrophoresis of frame and cab |
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| CN113088953A (en) * | 2019-12-23 | 2021-07-09 | 绵阳海立电器有限公司 | Surface treatment method for compressor |
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| CN110541172A (en) * | 2019-08-30 | 2019-12-06 | 合肥通快钣金科技有限公司 | Novel sheet metal part machining process |
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| CN111235620A (en) * | 2020-03-09 | 2020-06-05 | 天津合力嘉科技有限公司 | Electrophoresis coating process for vehicle frame |
| CN111235620B (en) * | 2020-03-09 | 2021-09-28 | 天津合力嘉科技有限公司 | Electrophoresis coating process for vehicle frame |
| CN111118580A (en) * | 2020-03-17 | 2020-05-08 | 常熟华庆汽车部件有限公司 | Electrophoresis process of automobile parts |
| WO2021184659A1 (en) * | 2020-03-17 | 2021-09-23 | 常熟华庆汽车部件有限公司 | Electrophoresis process for automobile part |
| CN112481678A (en) * | 2020-10-30 | 2021-03-12 | 河南德力新能源汽车有限公司 | Automobile pretreatment electrophoresis process simultaneously suitable for multiple plates |
| CN112893066A (en) * | 2021-01-15 | 2021-06-04 | 合肥瑞昇流体机械制造有限公司 | Surface coating process for processing fire-fighting equipment |
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