CN110129783A - A kind of Pretreatment Technology Before Finishing - Google Patents
A kind of Pretreatment Technology Before Finishing Download PDFInfo
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- CN110129783A CN110129783A CN201910299984.0A CN201910299984A CN110129783A CN 110129783 A CN110129783 A CN 110129783A CN 201910299984 A CN201910299984 A CN 201910299984A CN 110129783 A CN110129783 A CN 110129783A
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- Prior art keywords
- silane
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- spraying
- washing
- pretreatment
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/34—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
- C23C22/77—Controlling or regulating of the coating process
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
- C23C2222/20—Use of solutions containing silanes
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- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a kind of Pretreatment Technology Before Finishings, comprising the following steps: S1: washing 1；S2: pure water direct-injection；S3: silane treatment；S4: tank liquor pH value adjustment；S5: washing 2；S6: drying；S7: spraying pretreatment；S8: spraying, the present invention is to be surface-treated using organosilan as important raw material to plate, is reacted using fluorine zirconic acid with the dissolution of the water of silane, forms the chemical combination substance of zirconium oxide and silica composition in plate surface, relatively traditional phosphating process corrosion resistance is strong, and adhesive force is strong；Silane pre-treating technology is without heating, short processing time, it is easy to operate, it is opposite in terms of the energy to reduce, and the appearance of the without phosphorus slugging of sediment will not be generated, it is thin to form film, strict control parameter of pre-treatment process, due to not phosphorous in silane, silicone content about 40PPM, zirconium content about 200PPM, when rear road washing reaches balance, therefore cost for wastewater treatment will greatly reduce.
Description
Technical field
The invention belongs to car body coating pretreatment technology fields, and in particular to a kind of Pretreatment Technology Before Finishing.
Background technique
Coating Pretreatment is the various greasy dirts (such as lubricating oil, grease, sweat) eliminated on bodywork surface, keeps coated surface clean
Net cleaning process is the essential process of coating；However phosphating coat is only in the vehicle of sundries such as thoroughly degrease, become rusty
Body is formed on surface, and the chemical combination substance to have been formed need to select dirty removal capacities strong, and the strong solvent of derusting ability is extremely important, therefore
Table tune technique need to be set, but table tune technique need to use a large amount of chemical agent, silicate, sulfuric acid, ferrous sulfate, phosphoric acid, carbonic acid
The poisonous and harmful substances such as sodium cause significant impact to environment, personnel, workshop etc., and will form phosphatization slag in parkerizing process, and
The meeting of phosphatization slag should will also focus on phosphorus to the stringent control of scavenging effect because the allotment ratio difference of solvent carries out control
The formation of slugging.
Traditional phosphating process corrosion resistance and adhesive force are weaker, and phosphating process generally need to control 35 DEG C -55 DEG C of temperature,
The energy is higher, and can generate phosphatization slag, after subsequent washing cost for wastewater treatment is increased.
Summary of the invention
The purpose of the present invention is to provide a kind of Pretreatment Technology Before Finishing, using organosilan as important raw material to plate into
Row surface treatment, is reacted using fluorine zirconic acid with the dissolution of the water of silane, forms the change of zirconium oxide and silica composition in plate surface
Substance is closed, relatively traditional phosphating process corrosion resistance is strong, and adhesive force is strong；Silane pre-treating technology handles the time without heating
It is short, it is easy to operate, it is opposite in terms of the energy to reduce, and the appearance of the without phosphorus slugging of sediment will not be generated, formation film is thin, strict control
Parameter of pre-treatment process, due to not phosphorous in silane, silicone content about 40PPM, zirconium content about 200PPM, rear road washing reach balance
When, therefore cost for wastewater treatment will greatly reduce, to solve to propose the problems of the prior art in above-mentioned background technique.
To achieve the above object, present invention employs following technical solutions: a kind of Pretreatment Technology Before Finishing, including following step
It is rapid:
S1: bodywork surface is cleaned out in washing 1, cleans vehicle body surfaces externally and internally using giant, spare after cleaning；
S2: pure water direct-injection will be rinsed well with pure water inside and outside vehicle body, and bodywork surface is rinsed one with fresh deionized water after slot out
Time, the scum for being adhered to bodywork surface is washed away, checks and adds pure water to overflow liquid level, guarantee a certain amount of overflow；
S3: silane treatment, bodywork surface form the compound silane film layer of one layer of fine and close organic/inorganic, select silane list processing agent
KR-S210, silane additives KR-S211 and additive KR-S2108 proportion mixing, silane slot allocation ratio is according to KR-S211:
5kg/m3, KR-S210:2kg/m3, KR-S2108:2.5~3kg/m3, be sufficiently mixed uniformly；
S4: the adjustment of tank liquor pH value, tank liquor per ton add 0.7kg KR-S211 and 0.1kg KR-S210 for improving tank liquor activation
Point 1pt；When pH value is relatively low, lower than 5.0 or when being higher than 7.0, figure layer adhesive force reduces value, controls the optimal pH of tank liquor, pH value
When relatively low, addition KR-S212 adjustment；When pH value is higher, by adding KR-S214, to reduce pH value；
S5: the silane liquid being attached on white body surfaces externally and internally is cleaned in washing 2, controls conductivity≤1000 μ s/cm, pH value control
System is in 6-8,0.1~0.2Mpa of spray pressure；
S6: the vehicle body after washing is carried out drying drying by drying, spare after the completion of dry；
S7: spraying pretreatment, into painting electrophoresis slot before need carry out the processing of pure water spraying humidification, it is ensured that dry and wet is equal before vehicle body enters slot
It is even；
S8: vehicle body is sent into painting electrophoresis slot and carries out spraying operation by spraying.
Preferably, conductivity≤50 μ s/cm are controlled in the step S2 pure water direct-injection process, pH value control is sprayed 6~8
Drench 0.1~0.2Mpa of pressure.
Preferably, silane bath parameters control activation point is detected in 5-7pt, ICP instrument in the step S3 silane treatment
Cu2+For 1~5ppm, Si4+For 5~30ppm, Zr2+For 80~120ppm, pH value 4-5,35~45ppm of fluorine content, conductivity <
4000 μ s/cm, 15~40 DEG C for the treatment of temperature.
Preferably, the optimum controling range of the pH value adjustment of the step S4 tank liquor is between 6.0-7.0.
Preferably, the treatment temperature of the baking step of the step S6 is 40~80 DEG C.
Preferably, spraying using atomizing spraying progress humidification process in the spraying pretreatment, spray time is not
Lower than 0.5min.
A kind of Pretreatment Technology Before Finishing proposed by the present invention has the advantage that compared with prior art
1, the present invention is to be surface-treated using organosilan as important raw material to plate, utilizes the water-soluble of fluorine zirconic acid and silane
Solution reaction forms the chemical combination substance of zirconium oxide and silica composition, relatively traditional phosphating process corrosion resistance in plate surface
By force, adhesive force is strong；For silane pre-treating technology without heating, short processing time is easy to operate, opposite in terms of the energy to reduce, and
The appearance of the without phosphorus slugging of sediment will not be generated, formation film is thin, strict control parameter of pre-treatment process, due to not phosphorous in silane,
Silicone content about 40PPM, zirconium content about 200PPM, when rear road washing reaches balance, therefore cost for wastewater treatment will greatly reduce.
Detailed description of the invention
Fig. 1 is a kind of Pretreatment Technology Before Finishing flow chart of the present invention；
Fig. 2 is that a kind of compound silane film of organic/inorganic of Pretreatment Technology Before Finishing of the present invention forms schematic diagram.
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.Herein
Described specific embodiment is only used to explain the present invention, is not intended to limit the present invention.Based on the embodiments of the present invention,
Every other embodiment obtained by those of ordinary skill in the art without making creative efforts, belongs to this hair
The range of bright protection.
Embodiment 1
The present invention provides a kind of Pretreatment Technology Before Finishings referring to FIG. 1-2, comprising the following steps:
S1: bodywork surface is cleaned out in washing 1, cleans vehicle body surfaces externally and internally using giant, spare after cleaning；
S2: pure water direct-injection will be rinsed well with pure water inside and outside vehicle body, and bodywork surface is rinsed one with fresh deionized water after slot out
Time, the scum for being adhered to bodywork surface is washed away, checks and adds pure water to overflow liquid level, guarantee a certain amount of overflow；
S3: silane treatment, bodywork surface form the compound silane film layer of one layer of fine and close organic/inorganic, select silane list processing agent
KR-S210, silane additives KR-S211 and additive KR-S2108 proportion mixing, silane slot allocation ratio is according to KR-S211:
5kg/m3, KR-S210:2kg/m3, KR-S2108:2.5g/m3, be sufficiently mixed uniformly；
S4: the adjustment of tank liquor pH value, tank liquor per ton add 0.7kg KR-S211 and 0.1kg KR-S210 for improving tank liquor activation
Point 1pt；When pH value is relatively low, lower than 5.0 or when being higher than 7.0, figure layer adhesive force reduces value, controls the optimal pH of tank liquor, pH value
When relatively low, addition KR-S212 adjustment；When pH value is higher, by adding KR-S214, to reduce pH value；
S5: the silane liquid being attached on white body surfaces externally and internally is cleaned in washing 2, controls conductivity≤1000 μ s/cm, pH value control
System is 6, spray pressure 0.1Mpa；
S6: the vehicle body after washing is carried out drying drying by drying, spare after the completion of dry；
S7: spraying pretreatment, into painting electrophoresis slot before need carry out the processing of pure water spraying humidification, it is ensured that dry and wet is equal before vehicle body enters slot
It is even；
S8: vehicle body is sent into painting electrophoresis slot and carries out spraying operation by spraying.
Conductivity≤50 μ s/cm are controlled in the step S2 pure water direct-injection process, pH value control is 6, spray pressure
0.1Mpa, silane bath parameters control activation point detects Cu in 5pt, ICP instrument in the step S3 silane treatment2+For 1~
5ppm, Si4+For 5ppm, Zr2+For 80ppm, pH value 4, fluorine content 35ppm, conductivity < 4000 μ s/cm, 15 DEG C for the treatment of temperature,
The Optimal Control of the pH value adjustment of the step S4 tank liquor is 6.0, and the treatment temperature of the baking step of the step S6 is 40 DEG C,
Spraying using atomizing spraying progress humidification process in the spraying pretreatment, spray time is not less than 0.5min.
Embodiment 2
The present invention provides a kind of Pretreatment Technology Before Finishings referring to FIG. 1-2, comprising the following steps:
S1: bodywork surface is cleaned out in washing 1, cleans vehicle body surfaces externally and internally using giant, spare after cleaning；
S2: pure water direct-injection will be rinsed well with pure water inside and outside vehicle body, and bodywork surface is rinsed one with fresh deionized water after slot out
Time, the scum for being adhered to bodywork surface is washed away, checks and adds pure water to overflow liquid level, guarantee a certain amount of overflow；
S3: silane treatment, bodywork surface form the compound silane film layer of one layer of fine and close organic/inorganic, select silane list processing agent
KR-S210, silane additives KR-S211 and additive KR-S2108 proportion mixing, silane slot allocation ratio is according to KR-S211:
5kg/m3, KR-S210:2kg/m3, KR-S2108:2.75kg/m3, be sufficiently mixed uniformly；
S4: the adjustment of tank liquor pH value, tank liquor per ton add 0.7kg KR-S211 and 0.1kg KR-S210 for improving tank liquor activation
Point 1pt；When pH value is relatively low, lower than 5.0 or when being higher than 7.0, figure layer adhesive force reduces value, controls the optimal pH of tank liquor, pH value
When relatively low, addition KR-S212 adjustment；When pH value is higher, by adding KR-S214, to reduce pH value；
S5: the silane liquid being attached on white body surfaces externally and internally is cleaned in washing 2, controls conductivity≤1000 μ s/cm, pH value control
System is in 6-8, spray pressure 0.15Mpa；
S6: the vehicle body after washing is carried out drying drying by drying, spare after the completion of dry；
S7: spraying pretreatment, into painting electrophoresis slot before need carry out the processing of pure water spraying humidification, it is ensured that dry and wet is equal before vehicle body enters slot
It is even；
S8: vehicle body is sent into painting electrophoresis slot and carries out spraying operation by spraying.
Conductivity≤50 μ s/cm are controlled in the step S2 pure water direct-injection process, pH value control is 7, spray pressure
0.15Mpa, silane bath parameters control activation point detects Cu in 6pt, ICP instrument in the step S3 silane treatment2+For 3ppm,
Si4+For 17.5ppm, Zr2+For 100ppm, pH value 4.5,4000 μ s/cm of fluorine content 40ppm, conductivity <, treatment temperature 27.5
DEG C, the Optimal Control of the pH value adjustment of the step S4 tank liquor is 6.5, and the treatment temperature of the baking step of the step S6 is 60
DEG C, spraying using atomizing spraying progress humidification process in the spraying pretreatment, spray time is not less than 0.5min.
Embodiment 3
The present invention provides a kind of Pretreatment Technology Before Finishings referring to FIG. 1-2, comprising the following steps:
S1: bodywork surface is cleaned out in washing 1, cleans vehicle body surfaces externally and internally using giant, spare after cleaning；
S2: pure water direct-injection will be rinsed well with pure water inside and outside vehicle body, and bodywork surface is rinsed one with fresh deionized water after slot out
Time, the scum for being adhered to bodywork surface is washed away, checks and adds pure water to overflow liquid level, guarantee a certain amount of overflow；
S3: silane treatment, bodywork surface form the compound silane film layer of one layer of fine and close organic/inorganic, select silane list processing agent
KR-S210, silane additives KR-S211 and additive KR-S2108 proportion mixing, silane slot allocation ratio is according to KR-S211:
5kg/m3, KR-S210:2kg/m3, KR-S2108:3kg/m3, be sufficiently mixed uniformly；
S4: the adjustment of tank liquor pH value, tank liquor per ton add 0.7kg KR-S211 and 0.1kg KR-S210 for improving tank liquor activation
Point 1pt；When pH value is relatively low, lower than 5.0 or when being higher than 7.0, figure layer adhesive force reduces value, controls the optimal pH of tank liquor, pH value
When relatively low, addition KR-S212 adjustment；When pH value is higher, by adding KR-S214, to reduce pH value；
S5: the silane liquid being attached on white body surfaces externally and internally is cleaned in washing 2, controls conductivity≤1000 μ s/cm, pH value control
System is 8, spray pressure 0.2Mpa；
S6: the vehicle body after washing is carried out drying drying by drying, spare after the completion of dry；
S7: spraying pretreatment, into painting electrophoresis slot before need carry out the processing of pure water spraying humidification, it is ensured that dry and wet is equal before vehicle body enters slot
It is even；
S8: vehicle body is sent into painting electrophoresis slot and carries out spraying operation by spraying.
Conductivity≤50 μ s/cm are controlled in the step S2 pure water direct-injection process, pH value control is 8, spray pressure
0.2Mpa, silane bath parameters control activation point detects Cu in 7pt, ICP instrument in the step S3 silane treatment2+For 5ppm,
Si4+For 30ppm, Zr2+For 120ppm, pH value 5, fluorine content 45ppm, conductivity < 4000 μ s/cm is 40 DEG C for the treatment of temperature, described
The optimum controling range of the pH value adjustment of step S4 tank liquor is between 7.0, and the treatment temperature of the baking step of the step S6 is
80 DEG C, described spray in pretreatment carries out humidification process using atomizing spraying by spraying, and spray time is not less than 0.5min.
In a kind of Pretreatment Technology Before Finishing of the present invention, twice in water-washing step, washing parameter corresponding data is as follows:
| Conductivity (μ s/cm) | pH | Spray pressure (Mpa) | |
| Washing 1 | ≤50 | 6~8 | 0.1~0.2 |
| Washing 2 | ≤1000 | 6-8 | 0.1~0.2 |
In summary: the present invention is to be surface-treated using organosilan as important raw material to plate, utilizes fluorine zirconic acid and silicon
The water of alkane dissolves reaction, forms the chemical combination substance of zirconium oxide and silica composition, relatively traditional phosphating process in plate surface
Corrosion resistance is strong, and adhesive force is strong；For silane pre-treating technology without heating, short processing time is easy to operate, opposite in terms of the energy
It reduces, and the appearance of the without phosphorus slugging of sediment will not be generated, formation film is thin, strict control parameter of pre-treatment process, due in silane
Not phosphorous, silicone content about 40PPM, zirconium content about 200PPM, when rear road washing reaches balance, therefore cost for wastewater treatment will subtract significantly
It is few.
Finally, it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not intended to restrict the invention,
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features,
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (6)
1. a kind of Pretreatment Technology Before Finishing, it is characterised in that: the following steps are included:
S1: bodywork surface is cleaned out in washing 1, cleans vehicle body surfaces externally and internally using giant, spare after cleaning；
S2: pure water direct-injection will be rinsed well with pure water inside and outside vehicle body, and bodywork surface is rinsed one with fresh deionized water after slot out
Time, the scum for being adhered to bodywork surface is washed away, checks and adds pure water to overflow liquid level, guarantee a certain amount of overflow；
S3: silane treatment, bodywork surface form the compound silane film layer of one layer of fine and close organic/inorganic, select silane list processing agent
KR-S210, silane additives KR-S211 and additive KR-S2108 proportion mixing, silane slot allocation ratio is according to KR-S211:
5kg/m3, KR-S210:2kg/m3, KR-S2108:2.5~3kg/m3, be sufficiently mixed uniformly；
S4: the adjustment of tank liquor pH value, tank liquor per ton add 0.7kg KR-S211 and 0.1kg KR-S210 for improving tank liquor activation
Point 1pt；When pH value is relatively low, lower than 5.0 or when being higher than 7.0, figure layer adhesive force reduces value, controls the optimal pH of tank liquor, pH value
When relatively low, addition KR-S212 adjustment；When pH value is higher, by adding KR-S214, to reduce pH value；
S5: the silane liquid being attached on white body surfaces externally and internally is cleaned in washing 2, controls conductivity≤1000 μ s/cm, pH value control
System is in 6-8,0.1~0.2Mpa of spray pressure；
S6: the vehicle body after washing is carried out drying drying by drying, spare after the completion of dry；
S7: spraying pretreatment, into painting electrophoresis slot before need carry out the processing of pure water spraying humidification, it is ensured that dry and wet is equal before vehicle body enters slot
It is even；
S8: vehicle body is sent into painting electrophoresis slot and carries out spraying operation by spraying.
2. a kind of Pretreatment Technology Before Finishing according to claim 1, it is characterised in that: the step S2 pure water direct-injection process
Middle control conductivity≤50 μ s/cm, pH value control is 6~8,0.1~0.2Mpa of spray pressure.
3. a kind of Pretreatment Technology Before Finishing according to claim 1, it is characterised in that: silicon in the step S3 silane treatment
For alkane bath parameters control activation point in 5-7pt, ICP instrument detects Cu2+For 1~5ppm, Si4+For 5~30ppm, Zr2+For 80~
120ppm, pH value 4-5,35~45ppm of fluorine content, conductivity < 4000 μ s/cm, 15~40 DEG C for the treatment of temperature.
4. a kind of Pretreatment Technology Before Finishing according to claim 1, it is characterised in that: the pH value tune of the step S4 tank liquor
Whole optimum controling range is between 6.0-7.0.
5. a kind of Pretreatment Technology Before Finishing according to claim 1, it is characterised in that: the baking step of the step S6
Treatment temperature is 40~80 DEG C.
6. a kind of Pretreatment Technology Before Finishing according to claim 1, it is characterised in that: being sprayed in the spraying pretreatment
Humidification process is carried out using atomizing spraying, spray time is not less than 0.5min.
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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 |
| CN111774274A (en) * | 2020-07-07 | 2020-10-16 | 湖北华越汽车零部件有限公司 | Surface treatment process for automobile frame |
| CN112251744A (en) * | 2020-09-29 | 2021-01-22 | 上海福阜机械科技有限公司 | Metal plate coating pretreatment process |
| CN112251744B (en) * | 2020-09-29 | 2022-10-21 | 上海福阜机械科技有限公司 | Metal plate coating pretreatment process |
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Application publication date: 20190816 |