CN118186531A - Method for coloring surface of aluminum or aluminum alloy - Google Patents
Method for coloring surface of aluminum or aluminum alloy Download PDFInfo
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- CN118186531A CN118186531A CN202410453535.8A CN202410453535A CN118186531A CN 118186531 A CN118186531 A CN 118186531A CN 202410453535 A CN202410453535 A CN 202410453535A CN 118186531 A CN118186531 A CN 118186531A
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- pearl powder
- aluminum
- electrophoresis tank
- coloring
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 22
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 238000004040 coloring Methods 0.000 title claims abstract description 19
- 229910000838 Al alloy Inorganic materials 0.000 title abstract description 8
- 238000001962 electrophoresis Methods 0.000 claims abstract description 56
- 239000000843 powder Substances 0.000 claims abstract description 48
- 230000008569 process Effects 0.000 claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 18
- 230000003647 oxidation Effects 0.000 claims abstract description 18
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 18
- 238000004043 dyeing Methods 0.000 claims abstract description 10
- 239000000725 suspension Substances 0.000 claims abstract description 9
- 230000000694 effects Effects 0.000 claims abstract description 5
- 238000004140 cleaning Methods 0.000 claims description 30
- 229910045601 alloy Inorganic materials 0.000 claims description 17
- 239000000956 alloy Substances 0.000 claims description 17
- 230000003472 neutralizing effect Effects 0.000 claims description 12
- 238000005273 aeration Methods 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 238000005498 polishing Methods 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims description 7
- 230000005484 gravity Effects 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 4
- 238000009835 boiling Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims 3
- 239000003086 colorant Substances 0.000 abstract description 6
- 238000001179 sorption measurement Methods 0.000 abstract description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 8
- 229910017604 nitric acid Inorganic materials 0.000 description 8
- 238000005238 degreasing Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 238000006386 neutralization reaction Methods 0.000 description 6
- 238000005488 sandblasting Methods 0.000 description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- 239000003513 alkali Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- 238000007743 anodising Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000012286 potassium permanganate Substances 0.000 description 2
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000010407 anodic oxide Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 235000010344 sodium nitrate Nutrition 0.000 description 1
- 239000004317 sodium nitrate Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000004018 waxing Methods 0.000 description 1
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention provides a surface coloring method of aluminum or aluminum alloy, which comprises the following steps: a pretreatment step of the surface of the workpiece; anodic oxidation, namely generating a porous oxide film on the surface of a workpiece; dyeing, namely adding pearl powder into the electrophoresis tank liquid, placing the workpiece subjected to anodic oxidation treatment into an electrophoresis tank, and enabling the electrophoresis tank liquid to be in a flowing state or the pearl powder to be in a uniform suspension state in the electrophoresis process so as to achieve the aim of uniformly dispersing the pearl powder; and (5) baking to obtain the workpiece with the flashing effect on the surface. The invention forms a film layer with a large number of micropores on the surface of the product through anodic oxidation, and then colors the product by utilizing an electrophoresis process, so that the micropores of the film layer have strong adsorption capacity and can be colored into various beautiful and gorgeous colors; and the pearl powder is added into the electrophoresis tank liquid, and then the sinking of the pearl powder is prevented through a special step, so that the pearl powder is uniformly distributed, the surface of the workpiece is uniformly flashed, and the product quality is improved.
Description
Technical Field
The invention relates to the technical field of metal surface treatment, in particular to a surface coloring method of aluminum or aluminum alloy.
Background
Anodic oxidation (anodic oxidation) is the electrochemical oxidation of metals or alloys. The metal or alloy product is used as anode and the surface of the product is formed into oxide film by electrolysis. The metal oxide film changes surface properties such as improving corrosion resistance, enhancing wear resistance and hardness, protecting metal surfaces, etc. The nonferrous metals or alloys thereof (e.g., aluminum, magnesium, alloys thereof, etc.) can be anodized.
Chinese patent document CN113481563B discloses a process for coloring aluminum alloy, which comprises anodizing an aluminum alloy product, and printing a color process pattern on the surface of the aluminum alloy with weak solvent ink. This process can print a pattern on the surface of a product, but is difficult to exhibit a sparkling effect; and for products that do not require a surface pattern, it is rarely colored in this way.
Disclosure of Invention
The invention provides a method for coloring the surface of aluminum or aluminum alloy, which can lead the surface of a product to have uniform flashing effect.
The invention is realized by the following technical scheme:
a method for coloring the surface of aluminum or an alloy thereof, comprising the steps of:
a pretreatment step of the surface of the workpiece;
anodic oxidation, namely generating a porous oxide film on the surface of a workpiece;
Dyeing; dyeing by adopting an electrophoresis process, adding pearl powder into electrophoresis tank liquor, placing the workpiece subjected to anodic oxidation treatment into an electrophoresis tank, and enabling the electrophoresis tank liquor to be in a flowing state or the pearl powder to be in a uniform suspension state in the electrophoresis process so as to achieve the aim of uniformly dispersing the pearl powder.
And (3) baking to obtain a workpiece with a flashing effect on the surface, wherein the flashing points are uniformly distributed.
The electrophoresis process is one of the most commonly used methods for coating metal workpieces, and other details of the electrophoresis process are not described herein.
Optionally, between the anodic oxidation and the dyeing, the method further comprises a step of immersing the workpiece in an acid solution to expand the aperture.
Optionally, before baking, the method further comprises the step of carrying out hole sealing treatment on the dyed workpiece in a hole sealing groove.
It is worth to say that the pretreatment modes of different workpieces have certain differences and can be selected according to the needs.
Optionally, the pretreatment process comprises degreasing, cleaning, alkaline cleaning, neutralizing, cleaning, chemical polishing, neutralizing and cleaning.
Optionally, adding a stirring device into the electrophoresis tank to make the electrophoresis tank liquid in a flowing state; or an aeration device is added into the electrophoresis tank to make the electrophoresis tank liquid in a boiling state, so that the pearl powder is uniformly dispersed.
Optionally, the pearl powder is magnetic pearl powder, a magnetic field is applied to the electrophoresis tank, and the pearl powder is in a uniform suspension state against gravity by utilizing magnetic force, so that the pearl powder is uniformly dispersed.
Preferably, the stirring device or the aeration device is turned off after the pearl powder is uniformly dispersed by the stirring device or the aeration device; then a magnetic field is applied to the electrophoresis tank, and the pearl powder is in a suspension state against gravity by utilizing magnetic force, so that the pearl powder is kept uniformly dispersed.
Further, the electrophoresis tank is provided with an intelligent switch, the power-on time of the electrophoresis tank is set according to the thickness, the power-off is automatically performed when the set time is reached, and the electrophoresis is stopped.
Further, a concentration meter is arranged in the electrophoresis tank.
Compared with the prior art, the application has at least the following beneficial effects:
The application forms a film layer with a large number of micropores on the surface of the product through anodic oxidation, and then colors the product by utilizing an electrophoresis process, so that the micropores of the film layer have strong adsorption capacity and can be colored into various beautiful and gorgeous colors; and the pearl powder is added into the electrophoresis tank liquid, and then the sinking of the pearl powder is prevented through a special step, so that the pearl powder is uniformly distributed, the surface of the workpiece is uniformly flashed, and the product quality is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, 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 invention 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 a method for coloring the surface of aluminum or an alloy thereof in an embodiment;
FIG. 2 is a schematic representation of an anodic oxide film under a microscope at a magnification of 2 ten thousand times in the example.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without collision. It should be noted that, in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described as different from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
As shown in fig. 1, the method for coloring the surface of aluminum or an alloy thereof disclosed in this embodiment includes the following steps:
S1, sand blasting, namely removing oxide skin, rust, impurities and the like on the surface of a workpiece through sand blasting, and providing a clean surface for subsequent oxidation treatment.
During sand blasting, sequentially feeding the workpieces into a sand blaster, and leaving a gap between each workpiece; the proper sand blasting air pressure should be set during sand blasting.
Illustratively, when the aluminum upper cover is sandblasted, the air pressure of the sandblasting is set to 3.0.
S2, hanging the workpiece on a hanger so as to immerse the workpiece in a subsequent reaction tank.
Optionally, the hanger is made of titanium, so that the hanger is alkali-resistant, acid-resistant and good in conductivity.
And S3, degreasing, namely sequentially putting the hung workpiece into two degreasing cylinders to degrease twice, so as to ensure that the whole hung workpiece is immersed in the bath liquid and rocked up and down, and removing greasy dirt and waxing on the surface of the workpiece.
Optionally, the degreasing solution is a nitric acid solution.
It is worth to say that the temperature of the degreasing solution and the degreasing time are reasonably set according to the needs.
In some embodiments, the nitric acid to water ratio in the nitric acid solution of this step is 20:100.
In some embodiments, the degreasing solution temperature is 40 ℃, and the soaking time is 80 seconds each.
S4, cleaning, namely cleaning the degreased workpiece for a plurality of times, wherein the surface of the cleaned workpiece is free of suspended matters and greasy dirt. The washing water can be tap water at normal temperature.
In general, in this step, the workpiece is sequentially put into three cleaning tanks to be cleaned three times, each for 80 seconds, so that the cleaning standard can be achieved.
S5, alkali washing; and (3) putting the cleaned workpiece into an alkaline washing tank, removing a natural oxide layer on the surface of the workpiece, and adjusting the brightness of the surface of the workpiece.
In some embodiments, the caustic wash solution temperature is 80 ℃ to 90 ℃;
the configuration mode of the alkaline washing solution is as follows: 200g of sodium hydroxide and 50g of sodium nitrate were added per liter of water.
S6, neutralizing, namely immersing the workpiece in a neutralizing solution at normal temperature, and removing compounds on the surface of the workpiece after alkali washing through neutralization.
Optionally, the neutralization solution in this step contains 30% nitric acid, 5% potassium permanganate and 65% clear water.
And S7, cleaning the neutralized workpiece for multiple times, wherein the surface of the cleaned workpiece is free of suspended matters and greasy dirt.
In general, in this step, the workpiece is sequentially put into three cleaning tanks to be cleaned three times, each for 80 seconds, so that the cleaning standard can be achieved.
S8, chemically polishing, namely immersing the workpiece in the polishing solution, and adjusting the brightness of the surface of the workpiece.
In some embodiments, the slurry temperature is from 90 ℃ to 110 ℃; the polishing solution contains sulfuric acid with the concentration of 98%, phosphoric acid with the concentration of 85% and nitric acid with the concentration of 98%; wherein, sulfuric acid: phosphoric acid: the content ratio of nitric acid is 16:80:4.
S9, neutralizing, namely immersing the workpiece into a neutralizing solution at normal temperature, and removing compounds on the surface of the workpiece after chemical polishing through neutralization.
In some embodiments, the neutralization solution of this step contains 30% nitric acid, 5% potassium permanganate, and 65% clear water.
S10, cleaning the neutralized workpiece for multiple times, wherein the surface of the cleaned workpiece is standard in that suspended matters and greasy dirt do not exist.
In general, in this step, the workpiece is sequentially put into three cleaning tanks to be cleaned three times, each for 80 seconds, so that the cleaning standard can be achieved.
S11, anodic oxidation, namely immersing the workpiece in the medium anodic oxidation tank to form a porous oxide film on the surface of the workpiece.
In some embodiments, the anodizing bath solution is configured in the following manner: 150-200 g/L of sulfuric acid, 10-15 g/L of alumina and 65% of clear water; the temperature of the bath solution is 18-20 ℃.
As shown in FIG. 2, 77 hundred million nanopores were anodized per square centimeter of aluminum surface shell at this ratio.
The equipment used in this step is a refrigerator, a positive current device, a lead plate, a copper plate, a PP tank, etc., which are conventional in the art and will not be described here.
S12, cleaning, namely cleaning the anodized workpiece for a plurality of times, wherein the surface of the cleaned workpiece is standard in that suspended matters and greasy dirt do not exist.
In general, in this step, the workpiece is sequentially put into three cleaning tanks to be cleaned three times, each for 80 seconds, so that the cleaning standard can be achieved.
S13, neutralizing and reaming, namely immersing the workpiece in a neutralizing solution at normal temperature to neutralize the acid solution and enlarge micropores on the surface of the workpiece.
In some embodiments, the neutralization solution of this step comprises 5% nitric acid and 95% clear water.
S14, cleaning, namely cleaning the workpiece after neutralization and reaming for a plurality of times, wherein the surface of the cleaned workpiece is standard in that suspended matters and greasy dirt do not exist.
In general, in this step, the workpiece is sequentially put into three cleaning tanks to be cleaned three times, each for 80 seconds, so that the cleaning standard can be achieved.
S15, dyeing.
The step adopts an electrophoresis process for dyeing, pearl powder is added into the electrophoresis tank liquid, and the workpiece is placed into the electrophoresis tank, so that the whole hanging workpiece is ensured to be immersed into the tank liquid and shake up and down.
Because the granularity of the pearl powder is large, fluorescent points are unevenly distributed due to easy sinking, so that the electrophoresis tank liquid is in a flowing state or the pearl powder is in a uniform suspension state in the electrophoresis process, the downward precipitation and accumulation of the pearl powder under the action of gravity are avoided, and the fluorescent points on the surface of a workpiece are more evenly distributed.
The product surface is smooth and has certain alkali resistance by adopting electrophoresis technology for dyeing.
Observing whether the surface of the product has flow marks, pits and chromatic aberration after electrophoresis; the electrophoretic paint filter cotton core needs to be replaced periodically.
In order to ensure the attachment thickness of the electrophoresis tank liquid, an intelligent switch can be added, the power-on time is set according to the thickness, the set time is reached, and the automatic power-off is realized.
In some embodiments, a stirring device is added into the electrophoresis tank to enable the electrophoresis tank liquid to be in a flowing state, so that the pearl powder is prevented from sinking, and the pearl powder is uniformly dispersed.
In some embodiments, an aeration device is added into the electrophoresis tank to make the electrophoresis tank liquid in a boiling state, so that the pearl powder is prevented from sinking, and the pearl powder is uniformly dispersed.
In some embodiments, the pearl powder is magnetic pearl powder, and a magnetic field is applied at the electrophoresis tank to enable the pearl powder to be in a suspension state against gravity, so as to prevent the pearl powder from sinking.
In some embodiments, the stirring device or the aeration device is turned off after the pearl powder is uniformly dispersed by the stirring device or the aeration device; then a magnetic field is applied to the electrophoresis tank, and the pearl powder is in a suspension state against gravity by utilizing magnetic force, so that the pearl powder is kept uniformly dispersed.
In some embodiments, the electrophoresis tank is equipped with a concentration meter to monitor the tank fluid concentration.
Of course, parameters such as time, temperature, concentration, voltage and the like in the step are reasonably set according to the type, size and the like of a specific workpiece.
For example, taking an aluminum upper cover as an example, the electrophoresis time is 50 seconds, the temperature is 28 ℃, the concentration of the bath solution is 12%, and the voltage is 150v-180v.
S16, cleaning, namely cleaning the dyed workpiece for a plurality of times, wherein the surface of the cleaned workpiece is standard in terms of no suspended matters and no greasy dirt.
In general, in this step, the workpiece is sequentially put into four cleaning tanks for four times, each for 80 seconds, so that the cleaning standard can be achieved.
S17, hole sealing is carried out, and the dyed workpiece is subjected to hole sealing treatment in a hole sealing groove.
And S18, baking to obtain the workpiece with the uniformly shiny surface.
Of course, parameters such as temperature, time and the like during baking are reasonably set according to requirements.
In some embodiments, the baking temperature is 180 ℃, baking for 1.5 hours.
The appearance of the finally obtained workpiece can not be bumped, exposed, scratched or watermarked, the color difference is within DECMC 3.0.0, and the product which is qualified by the full inspection can be packaged.
The application forms a film layer with a large number of micropores on the surface of the product through anodic oxidation, and then colors the product by utilizing an electrophoresis process, so that the micropores of the film layer have strong adsorption capacity and can be colored into various beautiful and gorgeous colors; and the pearl powder is added into the electrophoresis tank liquid, and then the sinking of the pearl powder is prevented through a special step, so that the pearl powder is uniformly distributed, the surface of the workpiece is uniformly flashed, and the product quality is improved.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The surface coloring method of the aluminum or the alloy thereof comprises a pretreatment process of the surface of a workpiece, and is characterized by further comprising the following steps:
anodic oxidation, namely generating a porous oxide film on the surface of the workpiece;
Dyeing, namely adding pearl powder into the electrophoresis tank liquid, putting the workpiece subjected to anodic oxidation treatment into an electrophoresis tank, and enabling the electrophoresis tank liquid to be in a flowing state or the pearl powder to be in a uniform suspension state in the electrophoresis process so as to enable the pearl powder to be uniformly dispersed;
and (5) baking to obtain the workpiece with the flashing effect on the surface.
2. The method of coloring an aluminum or an alloy thereof according to claim 1, further comprising a step of immersing the work piece in an acid solution to expand the pore diameter between the anodic oxidation and the dyeing.
3. The method for coloring the surface of aluminum or an alloy thereof according to claim 2, wherein after the anodic oxidation, the surface is first cleaned and then subjected to a pore diameter enlarging process; after the pore diameter enlarging process, cleaning is performed first and then dyeing is performed.
4. The method for coloring the surface of aluminum or an alloy thereof according to claim 1, 2 or 3, further comprising a step of sealing the dyed workpiece in a sealing tank before the baking.
5. The method of coloring an aluminum or an alloy thereof according to claim 1, wherein the pretreatment process comprises the steps of:
Removing oil;
Cleaning;
Alkaline washing, namely putting the washed workpiece into an alkaline washing tank, removing a natural oxide layer on the surface of the workpiece, and adjusting the brightness of the surface of the workpiece;
neutralizing, namely immersing the alkali-washed workpiece into a neutralizing solution at normal temperature to remove compounds on the surface of the workpiece;
Cleaning;
Chemically polishing, namely immersing a workpiece into the polishing solution, and adjusting the brightness of the surface of the workpiece;
Neutralizing, namely immersing a workpiece into a neutralizing solution at normal temperature to remove compounds on the surface of the workpiece after chemical polishing;
Cleaning;
Thereafter, anodic oxidation is performed.
6. The method for coloring the surface of aluminum or an alloy thereof according to claim 1, wherein a stirring device is added in the electrophoresis tank to make the electrophoresis tank liquid in a flowing state so as to uniformly disperse the pearl powder.
7. The method for coloring the surface of aluminum or an alloy thereof according to claim 1, wherein an aeration device is added in the electrophoresis tank to make the electrophoresis tank liquid in a boiling state so as to uniformly disperse the pearl powder.
8. The method for coloring the surface of aluminum or an alloy thereof according to claim 1, 6 or 7, wherein the pearl powder is magnetic pearl powder, and the stirring device or the aeration device is turned off after the pearl powder is uniformly dispersed by the stirring device or the aeration device; and a magnetic field is applied to the electrophoresis tank, and the pearl powder is in a suspension state against gravity by utilizing magnetic force, so that the pearl powder is kept uniformly dispersed.
9. The method for coloring the surface of aluminum or an alloy thereof according to claim 1, wherein the electrophoresis tank is provided with an intelligent switch, the energization time of the electrophoresis tank is set according to the thickness, and the electrophoresis is stopped after reaching the set time and automatically being turned off.
10. The method of coloring an aluminum or an alloy thereof according to claim 1, wherein a concentration meter is installed in the electrophoresis tank.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410453535.8A CN118186531A (en) | 2024-04-15 | 2024-04-15 | Method for coloring surface of aluminum or aluminum alloy |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410453535.8A CN118186531A (en) | 2024-04-15 | 2024-04-15 | Method for coloring surface of aluminum or aluminum alloy |
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| CN118186531A true CN118186531A (en) | 2024-06-14 |
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| CN202410453535.8A Pending CN118186531A (en) | 2024-04-15 | 2024-04-15 | Method for coloring surface of aluminum or aluminum alloy |
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| Country | Link |
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| CN (1) | CN118186531A (en) |
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