CN117071032A - Electrophoretic coating process for automobile parts - Google Patents
Electrophoretic coating process for automobile parts Download PDFInfo
- Publication number
- CN117071032A CN117071032A CN202311033052.4A CN202311033052A CN117071032A CN 117071032 A CN117071032 A CN 117071032A CN 202311033052 A CN202311033052 A CN 202311033052A CN 117071032 A CN117071032 A CN 117071032A
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- automobile
- automobile parts
- parts
- electrophoresis
- coated
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- 238000000576 coating method Methods 0.000 title claims abstract description 28
- 238000001962 electrophoresis Methods 0.000 claims abstract description 47
- 239000011248 coating agent Substances 0.000 claims abstract description 19
- 238000011282 treatment Methods 0.000 claims abstract description 16
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000005406 washing Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000009489 vacuum treatment Methods 0.000 claims abstract description 8
- 229910052786 argon Inorganic materials 0.000 claims abstract description 7
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 238000005238 degreasing Methods 0.000 claims abstract description 7
- 239000012295 chemical reaction liquid Substances 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 34
- 230000008569 process Effects 0.000 claims description 30
- 238000005498 polishing Methods 0.000 claims description 11
- 238000001035 drying Methods 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 238000004070 electrodeposition Methods 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 239000010408 film Substances 0.000 description 19
- 230000000694 effects Effects 0.000 description 13
- 239000003973 paint Substances 0.000 description 11
- 238000005507 spraying Methods 0.000 description 11
- 239000010410 layer Substances 0.000 description 8
- 239000007788 liquid Substances 0.000 description 6
- 238000010422 painting Methods 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 239000002114 nanocomposite Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 125000003636 chemical group Chemical group 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000005237 degreasing agent Methods 0.000 description 1
- 239000013527 degreasing agent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 238000011221 initial treatment Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000002120 nanofilm Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- C25D13/12—Electrophoretic coating characterised by the process characterised by the article coated
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F3/00—Electrolytic etching or polishing
- C25F3/16—Polishing
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The application provides an automobile fitting electrophoretic coating process, which relates to the technical field of coating and comprises the following steps of: the auto parts after vacuum treatment are sent into an electrolytic cell, and fine burrs are removed and the brightness is increased on the surfaces of the auto parts through electrolytic reaction; sequentially carrying out hot water washing, degreasing and thinning treatment on the surface of the automobile part to be coated; the automobile parts after the electrophoretic coating are sent into a baking chamber and are baked at high temperature for a plurality of times; the auto parts to be coated after pretreatment are sent into an electrophoresis tank, so that the auto parts to be coated are completely immersed into electrophoresis reaction liquid; sending the electropolished automobile parts into a baking chamber again, and baking at high temperature for a plurality of times; and sending the dried automobile parts into a vacuum chamber, and injecting argon into the vacuum chamber for a preset period of time. The application can solve the problems of high cost and environmental pollution in the traditional technology.
Description
Technical Field
The application relates to the technical field of coating, in particular to an automobile accessory electrophoretic coating process.
Background
Automotive painting is a typical representation of modern industrial painting, and belongs to advanced protective painting and decorative painting, wherein more than about 95% of the internal and external surface areas of an automobile are protected and decorated by painting, and the painting has become one of four processes of an automobile host factory. The domestic automobile manufacturing development has been decades old, and the coating process is gradually updated and optimized along with the development of the automobile manufacturing industry. The existing technology of the automobile body is generally to coat the electrophoretic and solvent-adding type intermediate coat and the finishing coat matched with the phosphating pretreatment, wherein the finishing coat is coated after the coating is required to be baked and cured, the weather resistance of the automobile parts can be improved by spraying the finishing coat, and the spraying operation of the finishing coat is generally realized by adopting a manual operation spraying or robot spraying mode.
However, the process flow of spraying the finish paint needs to be matched with a strict gluing baking flow, so that the energy consumption is high, the problem that the paint diffuses in the air in the spraying process to a certain extent can occur, the environment can be influenced, and the paint is easy to waste due to spraying, so that the cost is increased.
Disclosure of Invention
The application aims to provide an automobile accessory electrophoretic coating process which can solve the problems of high cost and environmental pollution in the traditional technology.
In order to solve the technical problems, the application adopts the following technical scheme:
1. an automobile part electrophoretic coating process comprises the following steps:
s1: electrolytic polishing, namely sending the automobile parts subjected to vacuum treatment into an electrolytic cell, and removing fine burrs and increasing brightness on the surfaces of the automobile parts through electrolytic reaction;
s2: pretreatment, namely sequentially carrying out hot water washing, degreasing and thinning treatment on the surface of the automobile part to be coated;
s3: drying, namely sending the automobile parts subjected to electrophoretic coating into a baking chamber, and baking at high temperature for a plurality of times;
s4: electrophoresis, namely conveying the pretreated automobile parts to be coated into an electrophoresis tank, so that the automobile parts to be coated are completely immersed into electrophoresis reaction liquid;
s5: and (3) secondary drying, namely sending the auto parts subjected to electrolytic polishing into a baking chamber again, and baking at high temperature for a plurality of times.
S6: and (3) carrying out vacuum treatment, namely sending the dried automobile parts into a vacuum chamber, and injecting argon into the vacuum chamber for a preset period of time.
In the application, the thinning treatment process in the step S2 comprises taking fluorozirconate as a main agent to form a layer of amorphous three-dimensional reticular film on the surface of the degreased workpiece.
Further, in the present application, the temperature of the above-mentioned film formation treatment process is 20℃to 35 ℃.
Further, in the present application, in step S4, a conveying channel for conveying the automobile parts is provided in the electrophoresis tank.
Further, in the present application, the conveying passage is provided in a sealed manner.
Compared with the prior art, the application has at least the following advantages or beneficial effects:
the application ensures that the surface of the automobile part is derusted and degreased to form a compact film through pretreatment operation, ensures the electrophoresis effect, can further modify burrs or other uneven defects on the surface of the film formed through pretreatment through subsequent electrolytic polishing operation, ensures good surface condition before electrophoresis of the automobile part, improves the electrophoresis effect, realizes ionization operation in a vacuum state through drying after the electrophoresis coating is finished, further improves the surface quality of the automobile part after the electrophoresis coating, can realize good surface effect without a finish paint spraying process, reduces the cost and improves the Korean static pollution problem generated by a paint spraying process.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a process flow diagram of the present application;
Detailed Description
Examples
The embodiment of the application provides an automobile fitting electrophoretic coating process, which comprises the following steps of:
s1: electrolytic polishing, namely sending the automobile parts subjected to vacuum treatment into an electrolytic cell, and removing fine burrs and increasing brightness on the surfaces of the automobile parts through electrolytic reaction;
s2: pretreatment, namely sequentially carrying out hot water washing, degreasing and thinning treatment on the surface of the automobile part to be coated;
s3: drying, namely sending the automobile parts subjected to electrophoretic coating into a baking chamber, and baking at high temperature for a plurality of times;
s4: electrophoresis, namely conveying the pretreated automobile parts to be coated into an electrophoresis tank, so that the automobile parts to be coated are completely immersed into electrophoresis reaction liquid;
s5: and (3) secondary drying, namely sending the auto parts subjected to electrolytic polishing into a baking chamber again, and baking at high temperature for a plurality of times.
S6: and (3) carrying out vacuum treatment, namely sending the dried automobile parts into a vacuum chamber, and injecting argon into the vacuum chamber for a preset period of time.
It should be noted that, through electrolytic polishing operation can be with the burr or other inhomogeneous defect of pretreatment formation film surface further modify, guarantee that auto-parts electrophoresis front surface situation is good, promote the effect of electrophoresis, make auto-parts surface rust cleaning degreasing after forming dense film through the operation of pretreatment moreover, further guarantee the effect of electrophoresis, moreover after accomplishing the electrophoresis application, through the stoving effect, carry out vacuum argon treatment, realize ionization operation under the vacuum state, further promote the surface quality of auto-parts after the electrophoresis application.
For the electrolytic polishing process, the surface of the automobile fitting is smooth and clean due to the fact that untreated burrs and bulges possibly exist on the surface of the formed automobile fitting, and the surface of the automobile fitting can be fully treated by subsequent pretreatment operation.
Specifically, the auto parts are firstly hung in batches, namely the auto parts are arranged on a designated running water bracket, a production line is started, the auto parts enter an electrolytic cell along with the production line, electrolyte reacts with metal or metal oxide on the surface of the automobile, and electrolytic polishing is a common electrolytic machining method. The method utilizes the characteristic that the dissolution rate of the convex part on the surface of the automobile part is greater than that of the concave part in the electrolysis process to treat the micro-rough surface of the automobile part so as to lead the micro-rough surface to be bright and smooth, and has stronger corrosion resistance. The electrolytic polishing has the advantages of high speed, good quality, long service life of polishing solution, no influence of the shape of the workpiece, and the like.
After entering pretreatment process, the automobile parts are conveyed to a washing chamber, a plurality of uniformly arranged high-pressure spray heads are arranged in the washing chamber, and are provided with photosensitive sensors, when the automobile parts are detected, hot water with the stable range of 50-70 ℃ can be sprayed out, and a dirt remover is dissolved in the hot water, so that the washing operation can be realized for cleaning the complete foreign matters by the aid of residue dust and electrolytic polishing after the automobile parts are processed, and the primary treatment of the surfaces of the automobile parts is ensured.
After the operation of hot water washing is completed, the automobile parts enter a degreasing tank along with the assembly line, the automobile parts are completely immersed in the degreasing agent, oil stains and grease on the surfaces of the automobile parts are cleaned through the soaking effect of a preset period of time, and the stability of the later-stage electrophoretic coating is improved.
The degreased automobile part enters a pretreatment tank along with a production line, the reaction of chemical groups is realized by the treatment fluid in the automobile surface layer and the pretreatment tank, a large number of groups are formed by hydrolysis reaction of polymers in the solution, stable covalent bonds are formed by the groups and hydroxides of an oxide layer on the surface of the automobile part, meanwhile, a compact nano ceramic layer is formed on the surface of the automobile part by the inorganic nano film forming agent in the solution, and the compact nano ceramic layer is in action with the previous covalent bonds, so that the compact nano ceramic layer is firmly and stably connected with the surface of the automobile part, and further, the adsorption force between the subsequent electrophoretic coating layer and a base material can be improved, meanwhile, the surface defects of the base material can be fully filled by the nano composite film, and the corrosion resistance of the automobile part can be greatly improved.
In the whole pretreatment process flow, sundries on the surface of an automobile part can be cleaned through water washing and degreasing operation, so that the surface of a base material of the automobile part is free from foreign matters influencing the reaction process in the film treatment process, meanwhile, a layer of compact nano composite film is formed on the surface of the automobile part through the treatment of pretreatment liquid, the surface of the base material of the automobile part reacts with a solution to form a stable covalent bond, and the temperature of the film treatment process is 20-35 ℃, so that the stable covalent bond is easier to form at room temperature; can guarantee the good adsorptivity between auto-parts film and substrate build, and the film treatment process is compared with traditional phosphating pretreatment technology, can not produce a large amount of poisonous and harmful waste gas, and is energy-conserving and environmental protection, and nano composite film possesses better corrosion resistance in phosphating surface in addition, can promote the overall effect of electrophoresis application better.
Specifically, the thin film treatment process comprises the steps of taking fluorozirconate as a main agent, forming a layer of amorphous three-dimensional reticular film on the surface of a degreased and clean workpiece, and ensuring that a large amount of toxic and harmful waste gas is not generated, so that the method is energy-saving and environment-friendly, and has good corrosion resistance effect.
The auto-parts of accomplishing pretreatment can directly send into the baking chamber to realize the stoving effect of fixed duration in the baking chamber many times, make auto-parts surface no treatment liquid remain, prevent that electrophoresis operation from appearing when, the situation that the residual liquid hinders electrophoresis effect takes place.
The auto parts through many times regulation time stoving operation is directly sent into the electrophoresis tank, is full of the electrophoresis coating that disposes in the electrophoresis tank, adopts high throwing power electrophoresis coating in this embodiment, and high throwing power electrophoresis coating can improve the conductivity of electrophoresis tank liquid and the resistance of electrophoresis wet film through adjustment resin and curing agent system, realizes the promotion of throwing power. After the throwing power is improved, the thickness of the paint film on the outer surface is reduced, and the thickness of the paint film on the inner cavity is improved, so that the total consumption of the bicycle electrophoretic paint is reduced compared with that of the traditional electrophoretic paint.
When the automobile part is completely immersed in the electrophoresis tank, the tank is provided with a positively charged anode and a negatively charged cathode. Electrolytic decomposition of the conductive solution results in movement of charged particles, movement of negatively charged particles toward the anode, movement of positively charged cations toward the cathode (electrophoretic) the charged coating particles adhere to the metal substrate after precipitation from the solution (electrodeposition). As the deposited film thickens, the corresponding resistance at the coated surface increases. As the resistance increases, the workpiece gradually becomes an insulator, at which time film formation is stopped. Thereby being capable of forming uniform electrophoretic coating on the surface of the automobile part.
In the electrophoresis process, the auto-parts realize at the uniform velocity removal with driving the stores pylon and remove, the fixed knot of general stores pylon constructs and directly connects on the surface of auto-parts, but in actual operation, probably connecting position is at electrophoresis in-process probably because connection structure's shielding for auto-parts's connecting position electrophoresis application effect is not good, in order to solve above-mentioned problem, can set up conveying channel in the electrophoresis tank, auto-parts get into the electrophoresis tank, stores pylon guide auto-parts gets into conveying channel, stores pylon and auto-parts disconnection make auto-parts realize removing in the conveying channel of electrophoresis tank, and do not have other connection structure to connect auto-parts, ensure that the holistic outward appearance of auto-parts carries out electrophoresis application and does not receive the influence.
Specifically, the conveying channel in the electrophoresis tank is filled with electrophoresis tank liquid, the conveying channel is in a sealing state, after the automobile parts enter the conveying channel, the conveying channel is pressurized through an external air pressure pressurizing device, so that the tank liquid in the conveying channel flows under pressure and drives the automobile parts to move in the conveying channel, and after the automobile parts move to a designated position, the hanging rack is used for fixing the automobile parts again to drive the automobile parts to execute subsequent technological processes.
The automobile parts after the electrophoresis process are required to be further dried, a layer of uniform and compact coating is formed on the surface of the dried starting parts, but the defects of the process means are limited, and the surface color of the automobile parts after the electrophoresis process is darker.
In order to solve the problem of poor appearance of the automobile parts after the electrophoresis process, the dried automobile parts are sent into a vacuum chamber, argon is injected into the vacuum chamber for a preset period of time, in the vacuum chamber, the argon is excited into a plasma state, gas-phase substances are adsorbed on the solid surface, adsorbed groups react with molecules on the solid surface to generate product molecules, the product molecules are resolved to form gas phase, and reaction residues are separated from the surface, so that the outer surface layer of the electrophoresis coating is subjected to luster improvement treatment.
The surface gloss and surface quality of the automobile accessory can be improved through the vacuum treatment process, the integral corrosion resistance effect of the electrophoretic coating can be improved, the traditional paint spraying process can be omitted, the cost is saved, the environmental pollution in the paint spraying process is prevented, and the energy is saved and the environment is protected.
The above is only a preferred embodiment of the present application, and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (5)
1. The automobile part electrophoretic coating process is characterized by comprising the following steps of:
s1: electrolytic polishing, namely sending the automobile parts subjected to vacuum treatment into an electrolytic cell, and removing fine burrs and increasing brightness on the surfaces of the automobile parts through electrolytic reaction;
s2: pretreatment, namely sequentially carrying out hot water washing, degreasing and thinning treatment on the surface of the automobile part to be coated;
s3: drying, namely sending the automobile parts subjected to electrophoretic coating into a baking chamber, and baking at high temperature for a plurality of times;
s4: electrophoresis, namely conveying the pretreated automobile parts to be coated into an electrophoresis tank, so that the automobile parts to be coated are completely immersed into electrophoresis reaction liquid;
s5: secondary drying, namely sending the electropolished automobile parts into a baking chamber again, and baking at high temperature for a plurality of times;
s6: and (3) carrying out vacuum treatment, namely sending the dried automobile parts into a vacuum chamber, and injecting argon into the vacuum chamber for a preset period of time.
2. The process of electrodeposition coating according to claim 1, wherein the thinning process in step S2 comprises forming an amorphous three-dimensional net film on the surface of the degreased workpiece using fluorozirconate as a main agent.
3. The automotive part electrocoating process of claim 2, characterized in that the temperature of the film-forming treatment process is 20-35 ℃.
4. The automotive part electrocoating process according to claim 1, characterized in that a conveying channel for conveying automotive parts is provided in the electrophoresis tank in step S4.
5. The automotive part electrocoating process of claim 4, in which the transfer passage is a sealed arrangement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311033052.4A CN117071032A (en) | 2023-08-16 | 2023-08-16 | Electrophoretic coating process for automobile parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311033052.4A CN117071032A (en) | 2023-08-16 | 2023-08-16 | Electrophoretic coating process for automobile parts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117071032A true CN117071032A (en) | 2023-11-17 |
Family
ID=88710921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311033052.4A Pending CN117071032A (en) | 2023-08-16 | 2023-08-16 | Electrophoretic coating process for automobile parts |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117071032A (en) |
-
2023
- 2023-08-16 CN CN202311033052.4A patent/CN117071032A/en active Pending
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