CN113430511A - Surface treatment process for metal workpiece - Google Patents
Surface treatment process for metal workpiece Download PDFInfo
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- CN113430511A CN113430511A CN202110595846.4A CN202110595846A CN113430511A CN 113430511 A CN113430511 A CN 113430511A CN 202110595846 A CN202110595846 A CN 202110595846A CN 113430511 A CN113430511 A CN 113430511A
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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
- C23C22/78—Pretreatment of the material to be coated
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
- B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
- B05B13/04—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation
- B05B13/0405—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation with reciprocating or oscillating spray heads
- B05B13/041—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation with reciprocating or oscillating spray heads with spray heads reciprocating along a straight line
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B05B5/08—Plant for applying liquids or other fluent materials to objects
- B05B5/082—Plant for applying liquids or other fluent materials to objects characterised by means for supporting, holding or conveying the objects
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
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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
- C23C22/82—After-treatment
- C23C22/83—Chemical after-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
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/20—Pretreatment
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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
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/22—Servicing or operating apparatus or multistep processes
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Electrochemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
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Abstract
The application relates to the technical field of surface treatment, in particular to a metal workpiece surface treatment process, which comprises the following steps: s1, workpiece surface cleaning: removing oil stains and rust stains on the surface of the workpiece; s2, workpiece surface passivation: sequentially carrying out phosphating treatment and passivation treatment on the workpiece to form a phosphating film on the surface of the workpiece; s3, surface electrophoretic coating: immersing a workpiece into electrolyte, and performing electrophoresis on the workpiece to form an electrophoresis paint film on the surface of the phosphating film; s4, electrostatic surface spraying: and (3) electrostatically spraying a coating on the surface of the workpiece after the electrophoresis film covering, heating and drying the coating, and forming a layer of electrostatic paint film on the surface of the electrophoretic paint film. This application prepares bonderizing rete, electrophoresis lacquer rete and static lacquer rete in proper order on the workpiece surface, enables metal workpiece and has good corrosion resisting property, and stability is high, long service life.
Description
Technical Field
The application relates to the technical field of surface treatment, in particular to a metal workpiece surface treatment process.
Background
The lamp is a general term for lighting tools, and is divided into a ceiling lamp, a desk lamp, a wall lamp, a floor lamp and the like, and refers to an appliance capable of transmitting light, distributing and changing light distribution of a light source, and comprises all parts except the light source, which are required for fixing and protecting the light source, and circuit accessories which are necessary for connecting with a power supply. At present, a plurality of lamps are made of metal, particularly outdoor lamps, and the lamps made of metal materials have higher strength and better decorative effect. However, when the metal lamp is used outdoors, the metal lamp is easily corroded by oxygen, heat, water and the like, particularly in coastal areas, the salt content in the environment is higher than that in inland areas, and the corrosion condition is more serious than that in inland areas. Therefore, the corrosion resistance of the current lamp is difficult to meet the use requirement.
Disclosure of Invention
In order to improve the corrosion resistance of a lamp, the application provides a surface treatment process for a metal workpiece.
The technical scheme adopted by the surface treatment process for the metal workpiece is as follows:
a surface treatment process for a metal workpiece comprises the following steps:
s1, workpiece surface cleaning: removing oil stains and rust stains on the surface of the workpiece;
s2, workpiece surface passivation: sequentially carrying out phosphating treatment and passivation treatment on the workpiece to form a phosphating film on the surface of the workpiece;
s3, surface electrophoretic coating: immersing a workpiece into electrolyte, and performing electrophoresis on the workpiece to form an electrophoresis paint film on the surface of the phosphating film;
s4, electrostatic surface spraying: and (3) electrostatically spraying a coating on the surface of the workpiece after the electrophoresis film covering, heating and drying the coating, and forming a layer of electrostatic paint film on the surface of the electrophoretic paint film.
By adopting the technical scheme, the surface of the workpiece is cleaned and then subjected to surface passivation treatment, electrophoresis film coating treatment and electrostatic spraying treatment in sequence, so that a three-layer protection structure of a phosphating film layer, an electrophoresis paint film layer and an electrostatic paint film layer is formed on the surface of the workpiece in sequence, and the workpiece achieves higher salt mist corrosion resistance.
Optionally, the S1 specifically includes the following steps:
s1.1-1, deoiling: soaking the workpiece in hot alkaline chemical degreasing liquid;
s1.1-2, hot water washing: soaking the deoiled workpiece in hot water to remove residual hot alkaline chemical deoiling liquid;
s1.1-3, derusting: soaking the workpiece washed by hot water in an acidic rust removing solution;
s1.1-4, washing with cold water: and (4) flushing the surface of the derusted workpiece with cold water to remove the residual acidic derusting liquid.
By adopting the technical scheme, the workpiece is degreased by using hot alkaline chemical degreasing liquid, the oil stain on the surface of the workpiece is subjected to saponification reaction with alkaline solution, and then the workpiece is soaked in hot water, so that the alkaline solution attached to the surface of the workpiece and the product of the saponification reaction are melted into the hot water, and a better oil stain removal effect is achieved. After removing oil stains, the workpiece is derusted by using an acidic solution, double decomposition reaction is carried out on the rust stains on the surface of the workpiece and the acidic solution, and a cleaning agent is added into the acidic solution, so that the stain removal effect on the surface of the workpiece is improved. And finally, washing the surface of the workpiece by using cold water, and washing away the acidic solution attached to the surface of the workpiece and a product of double decomposition reaction to obtain the workpiece with higher surface cleanliness, so that the adhesiveness of a subsequent phosphating film layer on the surface of the clean workpiece is improved, and the falling-off phenomenon of the corrosion-resistant layer is avoided.
Optionally, the S1 specifically includes the following steps:
s1.2-1, sand blasting: sand blasting the surface of the workpiece by using sand blasting equipment to remove oil stains and rust stains;
s1.2-2, washing: and (5) washing the surface of the workpiece subjected to sand blasting by using cold water.
Through adopting above-mentioned technical scheme, use sand blasting equipment to the work piece surface sand blasting in order to get rid of greasy dirt and rust stain, then wash the work piece surface after the sandblast with cold water, have higher efficiency to the work piece surface clearance.
Optionally, the S2 specifically includes the following steps:
s2-1, phosphorization: putting the workpiece with the cleaned surface into a phosphating solution for soaking for phosphating;
s2-2, passivation: and putting the phosphated workpiece into a passivation solution for passivation.
By adopting the technical scheme, firstly, the workpiece is phosphorized to form a phosphorized film, then the workpiece is passivated, and the hole of the phosphorized film on the surface of the workpiece is sealed to form a uniform and stable protective film layer.
Optionally, the S3 specifically includes the following steps:
s3-1, electrophoresis: carrying out electrophoresis on the passivated workpiece;
s3-2, washing: washing the surface of the electrophoretic workpiece by using cold water to remove the residual passivation solution;
s3-3, drying: and baking the washed workpiece to obtain the electrophoretic paint film.
By adopting the technical scheme, the passivated workpiece is subjected to electrophoresis, the surface of the workpiece subjected to electrophoresis is washed by water flow to remove redundant electrophoretic liquid, and then the workpiece is dried, so that the electrophoretic paint film has a better curing effect.
Optionally, the S4 specifically includes the following steps:
s4-1, electrostatic spraying: carrying out high-voltage electrostatic spraying on the surface of the workpiece subjected to electrophoretic coating by using electrostatic spraying equipment;
s4-2, curing: and (4) baking and curing the workpiece subjected to electrostatic spraying to obtain an electrostatic paint film.
By adopting the technical scheme, the surface of the workpiece after electrophoresis is subjected to high-voltage electrostatic spraying, and then is baked and cured, so that a stable electrostatic paint film is formed, and finally the metal workpiece with a three-layer protective film structure is formed, and the corrosion resistance is good.
Optionally, after S4-2, the S4 further includes the following steps:
s4-3, deburring: and (5) smoothing burrs of the electrostatic paint film on the surface of the workpiece.
Through adopting above-mentioned technical scheme, the static that plays the membrane to workpiece surface carries out the burr and levels off, and the later stage of being convenient for is thick to be detected, reduces the stress concentration's that the burr brought the condition simultaneously.
Optionally, the electrostatic spraying device includes a first body and a second body, the first body is provided with a first conveying mechanism and a first spraying mechanism, and the second body is provided with a second conveying mechanism and a second spraying mechanism; the first machine body is provided with a feeding part and a discharging part, the second machine body is provided with a feeding part and a discharging part, and the discharging part is positioned above the feeding part; the first conveying mechanism comprises a conveying chain and a first driving assembly, the conveying chain is fixedly provided with a clamp, the clamp is used for clamping a workpiece, and the driving assembly drives the conveying chain to move; the second conveying mechanism comprises conveying mesh cloth and a second driving assembly, the conveying mesh cloth is used for bearing a workpiece, and the second driving assembly drives the conveying mesh cloth to move.
By adopting the technical scheme, in the process of electrostatic spraying of the workpiece by the electrostatic spraying equipment, firstly, the workpiece is fed by the feeding part, the workpiece is clamped by the clamp on the first machine body and is conveyed by the conveying chain, in the process, the first spraying mechanism carries out primary spraying on the surface of the workpiece, when the workpiece reaches the discharging part, the clamp releases the clamping on the workpiece, the workpiece falls onto the conveying mesh cloth, namely the workpiece reaches the feeding part of the second machine body, the conveying mesh cloth conveys the workpiece to the discharging part, in the process, the second spraying mechanism carries out secondary spraying on the workpiece, and the secondary spraying can carry out spraying on the part of the workpiece which is not sprayed due to clamping of the clamp in the primary spraying process, so that the whole electrostatic paint film on the surface of the workpiece is more uniform
Optionally, first spraying mechanism includes lifting unit and spraying piece, spraying piece is fixed in lifting unit, lifting unit orders about spraying piece goes up and down in order to carry out the spraying to the work piece in the first organism.
Through adopting above-mentioned technical scheme, lifting unit drives the spraying piece and goes up and down ceaselessly for spraying piece spun electrostatic spraying degree of consistency is higher, thereby makes the electrostatic spraying effect that the work piece received on first organism more even.
Optionally, the second spraying mechanism includes a sliding assembly and an electrostatic spray gun, the electrostatic spray gun is fixed to the sliding assembly, and the sliding assembly drives the electrostatic spray gun to slide so as to spray a workpiece in the second body.
Through adopting above-mentioned technical scheme, the slip subassembly drives the electrostatic spray gun and removes ceaselessly for electrostatic spray uniformity of electrostatic spray gun spun is higher, thereby makes the electrostatic spraying effect that the work piece received on the second organism more even.
Drawings
Fig. 1 is an overall three-dimensional view of an electrostatic spraying device in an embodiment of the present application.
Fig. 2 is a top view of the electrostatic spraying device in the embodiment of the present application, with the first body hidden.
Description of reference numerals: 1. a first body; 11. a feeding part; 12. a discharging part; 2. a first conveying mechanism; 21. a clamp; 3. a first spraying mechanism; 4. a second body; 41. a feeding section; 42. a discharge part; 5. a second transport mechanism; 6. and a second spraying mechanism.
Detailed Description
The present application is described in further detail below with reference to figures 1-2.
Example 1
The embodiment discloses a metal workpiece surface treatment process, which comprises the following steps:
s1, workpiece surface cleaning: the method for removing the oil stain and the rust stain on the surface of the workpiece specifically comprises the following steps:
s1.1-1, deoiling: soaking the workpiece in hot alkaline chemical degreasing fluid, wherein the hot alkaline chemical degreasing fluid is a ZJ-802 product produced by Guangdong Kewei environmental protection technology Limited and water, and the weight ratio of the product to the water is 1: 20, the oil removal temperature is 60 ℃, and the soaking time is 20 min.
S1.1-2, hot water washing: and (3) soaking the deoiled workpiece in hot water at 60 ℃ for 2 min.
S1.1-3, derusting: soaking the workpiece washed by hot water in an acidic rust removing solution, wherein a cleaning agent is added into the acidic rust removing solution, the total acidity of the acidic rust removing solution is 43mg/g, the free acidity is 41mg/g, the cleaning agent is a product of CA9020, which is produced by Guangdong Kewei environmental protection science and technology Limited, and the weight ratio of the cleaning agent to the rust removing solution is 3: 197, soaking time is 10 min.
S1.1-4, washing with cold water: and (4) flushing the surface of the derusted workpiece for 1min by using cold water at the flow speed of 3.0 m/s.
S2, workpiece surface passivation: the method comprises the following steps of sequentially carrying out phosphating treatment and passivation treatment on a workpiece to form a phosphating film on the surface of the workpiece:
s2-1, phosphorization: soaking the workpiece with the cleaned surface into a phosphating solution, wherein the phosphating solution is a product produced by the Aobang chemical industry and having a model number of KBM213 and water, and the phosphating solution is prepared by mixing the following components in parts by weight: 25, adding a catalyst into the solution, wherein the catalyst is a product produced by Lebang technology and having a model of LF-501, and the weight ratio of the catalyst to the phosphating solution is 3: 1000, the phosphating temperature is 50 ℃, and the soaking time is 10 min.
S2-2, passivation: and (3) putting the phosphated workpiece into a passivation solution, and soaking for 1min at room temperature, wherein the passivation solution is a medicine provided by the Oubang chemical industry and matched with KBM213 for use.
S3, surface electrophoretic coating: immersing a workpiece into electrolyte to carry out electrophoresis on the workpiece, and forming a layer of electrophoretic paint film on the surface of the phosphating film, wherein the method specifically comprises the following steps:
s3-1, electrophoresis: immerse the work piece in order to carry out the electrophoresis in the electrolyte, carry out the electrophoresis to the work piece after the surface passivation, the electrophoresis lacquer that the electrophoresis adopted is the electrophoresis lacquer that model that Shenzhen Zhi bang science and technology electrophoresis coating Limited company produced is H08-1, this electrophoresis lacquer when using with water with 9: 91, the electrophoresis voltage is 60V, the electrophoresis time is 2min, the electrophoresis temperature is 15 ℃, and the pH value of the paint liquid is 8.
S3-2, washing: washing the surface of the workpiece subjected to electrophoresis by using cold water at normal temperature, wherein the water flow speed is 1.5 m/s;
s3-3, drying: and (3) baking the washed workpiece at the temperature of 180 ℃ for 15min to form an electrophoretic paint film.
S4, electrostatic surface spraying: and (4) performing electrostatic spraying on the surface of the workpiece with the electrophoretic paint film in the step S3-3, and heating and drying the paint to form a layer of electrostatic paint film on the surface of the workpiece, wherein the method specifically comprises the following steps:
s4-1, electrostatic spraying: performing high-voltage electrostatic spraying on the surface of the workpiece subjected to electrophoretic coating by using electrostatic spraying equipment, wherein the electrostatic spraying powder is a coating produced by Acksonobel great wall coating (Guangdong) Co., Ltd;
s4-2, curing: and baking the surface of the workpiece to cure the electrostatic paint film, wherein the curing temperature is 180 ℃, and the curing time is 15 min.
The raw material manufacturers and the models are specifically selected for the auxiliary agents in the supporting embodiments, and are adopted for experiments, and in the actual production process, the sources of the raw materials are not limited to the manufacturers and the models.
Referring to fig. 1 and 2, the electrostatic spraying apparatus includes a first body 1 and a second body 4, and the first body 1 and the second body 4 sequentially perform electrostatic spraying on a workpiece. The first machine body 1 comprises a first machine shell, the first machine body 1 is provided with a feeding part 11 and a discharging part 12, and the feeding part 11 and the discharging part 12 are arranged adjacently. The first conveying mechanism 2 is arranged at the top of the first housing, the first conveying mechanism 2 comprises a conveying chain, the conveying chain is arranged around the edge of the first housing, clamps 21 are arranged on the conveying chain at equal intervals, the clamps 21 can be chucks or suckers and the like to grab workpieces, and in other embodiments, the clamps 21 can be replaced by hangers to hang the workpieces. First casing has two spraying portions, and spraying portion all is provided with first spraying mechanism 3, and first spraying mechanism 3 includes lifting unit and spraying piece, and the spraying piece sets up in the central point of spraying portion and puts, and the transfer chain is around spraying portion periphery, and lifting unit prefers to use the pneumatic cylinder, and the vertical setting of pneumatic cylinder, the cylinder of pneumatic cylinder are fixed in the top of first casing, and spraying piece is fixed to be set up in the bottom of the piston rod of pneumatic cylinder. Spraying piece is discoid, and spraying piece level sets up, is provided with a plurality of electrostatic spray nozzles around the spraying piece, and a plurality of electrostatic spray nozzle equidistance set up, and lifting unit orders about spraying piece and constantly goes up and down, and the electrostatic spray nozzle on the spraying piece constantly carries out the spraying to the work piece that the transfer chain transported. The work pieces are fed in the feeding section 11, the conveyor chain transports the work pieces successively through the two spraying sections and finally to the discharge section 12, and the grippers 21 drop the work pieces in the discharge section 12. The second machine body 4 comprises a second machine shell, the second machine body 4 is provided with a feeding portion 41 and a discharging portion 42, a second conveying mechanism 5 is arranged on the second machine shell, the second conveying mechanism 5 comprises conveying net cloth, the conveying net cloth is driven by the feeding portion 41 to the discharging portion 42, and the conveying net cloth penetrates through the second machine shell. The feeding portion 41 is located below the discharging portion 12, the workpiece falls onto the conveying mesh after being discharged by the discharging portion 12, and the conveying mesh conveys the workpiece from the feeding portion 41 to the discharging portion 42. Be provided with second spraying mechanism 6 in the second casing, second spraying mechanism 6 includes slip subassembly and electrostatic spray gun, and the slip subassembly is preferably linear electric motor, and linear electric motor is vertical to be set up, and linear electric motor has the slide, and the electrostatic spray gun is fixed in on the slide, and linear electric motor is located the conveying screen cloth top, and linear electric motor's slide slides from top to bottom, and the electrostatic spray gun carries out electrostatic spraying to the top surface and the side of work piece.
Examples 2 to 3
Examples 2-3 differ from example 1 above in the differences in the process parameters, see in particular table 1 below.
Example 4
Example 4 differs from example 1 in that: example 4 the surface of the workpiece was cleaned by sandblasting, see table 2 below.
Examples 5 to 6
Examples 5-6 differ from example 4 above in the differences in the process parameters, see in particular table 2 below.
Comparative examples 1 to 4
Comparative example 1 differs from example 1 in that: comparative example 1 the electrostatic spraying and curing treatment was not performed after the electrophoresis, cold water washing, and drying treatment, as shown in table 1 below.
Comparative example 2 differs from example 1 in that: comparative example 2 the electrostatic spraying and curing treatment was directly performed without electrophoresis, cold water washing and drying after the phosphating and passivation treatment, as shown in table 1 below.
Comparative example 3 differs from example 4 in that: comparative example 3 the electrostatic spraying and curing treatment was not performed after the electrophoresis, cold water washing, and drying treatment, as shown in table 2 below.
Comparative example 4 differs from example 4 in that: comparative example 4 the electrostatic spraying and curing treatment was directly performed without electrophoresis, cold water washing and drying after the phosphating and passivation treatment, as shown in table 2 below.
TABLE 1 Process parameter tables for examples 1-3 and comparative examples 1-2
TABLE 2 Process parameter tables for examples 4-6 and comparative examples 3-4
The salt spray test was carried out using 5% concentration neutral saline solution, wherein the salt content was 99.8% analytical grade NaCl, the test was carried out according to GB/T31467.3-2015 standard, the test was carried out at a temperature of (35. + -.1). degree.C, the temperature of the pressure tank was (47. + -.1). degree.C, and the pressure of the compressed air was (1.00. + -. 0.01) kg/cm2。
The above examples, in combination with the above data, show that no red rust occurs after 1500H of the salt spray test in the embodiments 1-6, while the red rust occurs in the comparative example 1 when the salt spray test reaches 900H, the red rust occurs in the comparative example 2 when the salt spray test is 950H, the red rust occurs in the comparative example 3 when the salt spray test is 850H, and the red rust occurs in the comparative example 4 when the salt spray test is 880H. The method is used for performing surface treatment on the metal workpiece by independently adopting an electrophoresis or spraying mode, and the corrosion resistance of the metal workpiece is weaker than that of the metal workpiece, so that the method is used for effectively improving the corrosion resistance of the surface of the metal workpiece by adopting a mode of combining phosphorization, electrophoresis and spraying.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. A surface treatment process for a metal workpiece is characterized by comprising the following steps:
s1, workpiece surface cleaning: removing oil stains and rust stains on the surface of the workpiece;
s2, workpiece surface passivation: sequentially carrying out phosphating treatment and passivation treatment on the workpiece to form a phosphating film on the surface of the workpiece;
s3, surface electrophoretic coating: immersing a workpiece into electrolyte, and performing electrophoresis on the workpiece to form an electrophoresis paint film on the surface of the phosphating film;
s4, electrostatic surface spraying: and (3) electrostatically spraying a coating on the surface of the workpiece after the electrophoresis film covering, heating and drying the coating, and forming a layer of electrostatic paint film on the surface of the electrophoretic paint film.
2. The metal workpiece surface treatment process as claimed in claim 1, wherein the step S1 specifically comprises the steps of:
s1.1-1, deoiling: soaking the workpiece in hot alkaline chemical degreasing liquid;
s1.1-2, hot water washing: soaking the deoiled workpiece in hot water to remove residual hot alkaline chemical deoiling liquid;
s1.1-3, derusting: soaking the workpiece washed by hot water in an acidic rust removing solution;
s1.1-4, washing with cold water: and (4) flushing the surface of the derusted workpiece with cold water to remove the residual acidic derusting liquid.
3. The metal workpiece surface treatment process as claimed in claim 1, wherein the step S1 specifically comprises the steps of:
s1.2-1, sand blasting: sand blasting the surface of the workpiece by using sand blasting equipment to remove oil stains and rust stains;
s1.2-2, washing: and (5) washing the surface of the workpiece subjected to sand blasting by using cold water.
4. The process for the surface treatment of a metal workpiece according to any one of claims 1 to 3, wherein S2 comprises the following steps:
s2-1, phosphorization: putting the workpiece with the cleaned surface into a phosphating solution for soaking for phosphating;
s2-2, passivation: and putting the phosphated workpiece into a passivation solution for passivation.
5. The metal workpiece surface treatment process as claimed in claim 4, wherein the step S3 specifically comprises the steps of:
s3-1, electrophoresis: carrying out electrophoresis on the passivated workpiece;
s3-2, washing: washing the surface of the electrophoretic workpiece by using cold water to remove the residual passivation solution;
s3-3, drying: and baking the washed workpiece to obtain the electrophoretic paint film.
6. The metal workpiece surface treatment process as claimed in claim 5, wherein the step S4 specifically comprises the steps of:
s4-1, electrostatic spraying: carrying out high-voltage electrostatic spraying on the surface of the workpiece subjected to electrophoretic coating by using electrostatic spraying equipment;
s4-2, curing: and (4) baking and curing the workpiece subjected to electrostatic spraying to obtain an electrostatic paint film.
7. The metal workpiece surface treatment process of claim 6, wherein the S4 further comprises the following steps after S4-2:
s4-3, deburring: and (5) smoothing burrs of the electrostatic paint film on the surface of the workpiece.
8. The metal workpiece surface treatment process according to claim 6, wherein: the electrostatic spraying equipment comprises a first machine body (1) and a second machine body (4), wherein the first machine body (1) is provided with a first conveying mechanism (2) and a first spraying mechanism (3), and the second machine body (4) is provided with a second conveying mechanism (5) and a second spraying mechanism (6); the first machine body (1) is provided with a feeding part (11) and a discharging part (12), the second machine body (4) is provided with a feeding part (41) and a discharging part (42), and the discharging part (12) is positioned above the feeding part (41); the first conveying mechanism (2) comprises a conveying chain, a clamp (21) is fixedly arranged on the conveying chain, and the clamp (21) is used for clamping and conveying workpieces; the second conveying mechanism (5) comprises a conveying net cloth which is used for bearing and conveying workpieces.
9. The metal workpiece surface treatment process according to claim 8, wherein: first spraying mechanism (3) are including lifting unit and spraying piece, spraying piece is fixed in lifting unit, lifting unit orders about spraying piece goes up and down in order to carry out the spraying to the work piece in first organism (1).
10. The metal workpiece surface treatment process according to claim 8, wherein: the second spraying mechanism (6) comprises a sliding assembly and an electrostatic spray gun, the electrostatic spray gun is fixed on the sliding assembly, and the sliding assembly drives the electrostatic spray gun to slide so as to spray the workpiece in the second machine body (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110595846.4A CN113430511A (en) | 2021-05-29 | 2021-05-29 | Surface treatment process for metal workpiece |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110595846.4A CN113430511A (en) | 2021-05-29 | 2021-05-29 | Surface treatment process for metal workpiece |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114657625A (en) * | 2022-03-25 | 2022-06-24 | 江苏徐工工程机械研究院有限公司 | Workpiece cleaning apparatus and workpiece cleaning method |
| CN115283678A (en) * | 2022-07-22 | 2022-11-04 | 德莱赛稳加油设备(上海)有限公司 | Manufacturing method of secondary oil gas recovery pump impeller of gas station |
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| CN102400197A (en) * | 2010-09-16 | 2012-04-04 | 郭子亿 | Electrophoresis technology for replacing electrofacing |
| CN104759383A (en) * | 2015-03-30 | 2015-07-08 | 湖北精诚钢结构股份有限公司 | Production line for automatically coating profile steel and coating method thereof |
| CN111005051A (en) * | 2018-10-08 | 2020-04-14 | 株洲中车时代电气股份有限公司 | Preparation method of metal piece surface composite coating |
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| CN102400197A (en) * | 2010-09-16 | 2012-04-04 | 郭子亿 | Electrophoresis technology for replacing electrofacing |
| CN104759383A (en) * | 2015-03-30 | 2015-07-08 | 湖北精诚钢结构股份有限公司 | Production line for automatically coating profile steel and coating method thereof |
| CN111005051A (en) * | 2018-10-08 | 2020-04-14 | 株洲中车时代电气股份有限公司 | Preparation method of metal piece surface composite coating |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114657625A (en) * | 2022-03-25 | 2022-06-24 | 江苏徐工工程机械研究院有限公司 | Workpiece cleaning apparatus and workpiece cleaning method |
| CN114657625B (en) * | 2022-03-25 | 2023-11-07 | 江苏徐工工程机械研究院有限公司 | Workpiece cleaning device and workpiece cleaning method |
| CN115283678A (en) * | 2022-07-22 | 2022-11-04 | 德莱赛稳加油设备(上海)有限公司 | Manufacturing method of secondary oil gas recovery pump impeller of gas station |
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Application publication date: 20210924 |