CN114481252A - Preparation method of 3D printed metal surface micro-arc oxidation film layer - Google Patents
Preparation method of 3D printed metal surface micro-arc oxidation film layer Download PDFInfo
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- 238000007745 plasma electrolytic oxidation reaction Methods 0.000 title claims abstract description 105
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 99
- 239000002184 metal Substances 0.000 title claims abstract description 99
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 43
- 230000001590 oxidative effect Effects 0.000 claims abstract description 20
- 238000005488 sandblasting Methods 0.000 claims abstract description 19
- 230000008569 process Effects 0.000 claims abstract description 16
- 238000004506 ultrasonic cleaning Methods 0.000 claims abstract description 8
- 230000003647 oxidation Effects 0.000 claims description 37
- 238000007254 oxidation reaction Methods 0.000 claims description 37
- 239000000243 solution Substances 0.000 claims description 34
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 30
- 238000010146 3D printing Methods 0.000 claims description 20
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 17
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 17
- 229910001220 stainless steel Inorganic materials 0.000 claims description 15
- 239000010935 stainless steel Substances 0.000 claims description 15
- 239000004115 Sodium Silicate Substances 0.000 claims description 11
- 230000001050 lubricating effect Effects 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 11
- -1 polytetrafluoroethylene Polymers 0.000 claims description 11
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 11
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 11
- XMVONEAAOPAGAO-UHFFFAOYSA-N sodium tungstate Chemical compound [Na+].[Na+].[O-][W]([O-])(=O)=O XMVONEAAOPAGAO-UHFFFAOYSA-N 0.000 claims description 11
- 238000004381 surface treatment Methods 0.000 claims description 9
- 238000007639 printing Methods 0.000 claims description 8
- 230000003746 surface roughness Effects 0.000 claims description 7
- 239000004576 sand Substances 0.000 claims description 6
- 239000008367 deionised water Substances 0.000 claims description 5
- 229910021641 deionized water Inorganic materials 0.000 claims description 5
- 238000000605 extraction Methods 0.000 claims description 5
- 239000011259 mixed solution Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 230000002688 persistence Effects 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 2
- 238000002679 ablation Methods 0.000 abstract description 6
- 238000011010 flushing procedure Methods 0.000 abstract description 5
- 239000000843 powder Substances 0.000 abstract description 4
- 238000010301 surface-oxidation reaction Methods 0.000 abstract description 3
- 239000003792 electrolyte Substances 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 230000035939 shock Effects 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
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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
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
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- Chemical Kinetics & Catalysis (AREA)
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- Organic Chemistry (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
The invention discloses a preparation method of a micro-arc oxidation film layer on a 3D printed metal surface, which comprises the following steps: firstly, carrying out surface sand blasting treatment on a 3D printed metal workpiece and then carrying out ultrasonic cleaning to obtain a treated 3D printed metal workpiece; step two, preparing an oxidizing solution; and thirdly, performing continuous pressure flushing circulation by using an oxidizing solution as an electrolyte, and performing micro-arc oxidation on the processed 3D printed metal workpiece by using a steady-step upflow method to form a micro-arc oxidation film layer on the surface. According to the invention, the surface of the processed 3D printed metal workpiece is subjected to continuous pressure flushing circulation by using the circulating system to extract the oxidizing solution in the micro-arc oxidation process, and the micro-arc oxidation is carried out by combining the steady step up-flow method, so that the uniformity of the surface oxidation film layer and the arc light of the processed 3D printed metal workpiece in the micro-arc oxidation process is improved, the phenomena of ablation and powder generation of the micro-arc oxidation film layer are avoided, and the quality of the micro-arc oxidation film layer is improved.
Description
Technical Field
The invention belongs to the technical field of films, and particularly relates to a preparation method of a 3D printed metal surface micro-arc oxidation film.
Background
3D printing is a relatively advanced manufacturing technique. The basic principle of the technology is that according to two-dimensional section information obtained by slicing a three-dimensional solid part, point, line or plane is used as a basic unit to carry out layer-by-layer stacking manufacturing, and finally, the solid part or a prototype is obtained, so that the manufacturing of the complex structure part which cannot be achieved or is difficult to achieve by a traditional method can be realized. The application range of 3D printing covers a plurality of fields such as aerospace, automobiles, daily consumer goods, medical treatment and the like. Among them, metal 3D printed parts are an important development direction of advanced manufacturing technology as the leading and most potential technology in the whole 3D printing system.
When the metal 3D printing part is used under partial working conditions, surface treatment is needed to meet the requirements of corrosion resistance, wear resistance, decoration or other special functions. The micro-arc oxidation technology is a surface treatment technology developed on the basis of anodic oxidation, and the prepared ceramic film has the advantages of good bonding strength, high hardness, biological performance, corrosion resistance, heat conductivity and the like, and has the advantages of simple process, simple treatment process, no influence on a substrate material and the like. Micro-arc oxidation has high requirements on the surface quality of a workpiece, the surface is generally required to be a polished surface, and when the roughness is high, a film layer is easy to ablate to cause quality problems. The 3D prints one deck of formation three-dimensional solid model of printing out of thin slice one deck by the printer, and the surface ubiquitous one deck line, the solid surface after the seam of each deck also can show as little pit or arch, so the surface roughness of 3D prints the piece higher, only can become smooth or even reach the mirror surface effect through the surface treatment back 3D prints the surface of goods. It is often necessary to achieve precise round holes and smooth flat surfaces by machining and then to assemble them with other parts. However, the complex and lightweight structure of the 3D printed part sometimes does not adapt well to the machining process due to insufficient rigidity. The most common and simpler surface treatment methods are manual grinding or sand blasting, but the roughness of the workpiece surface can only reach about 8-15 after the treatment. The polishing treatment with chemical agent can improve the surface finish to below 3, but the treatment cost is high.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of a micro-arc oxidation film layer on a 3D printed metal surface aiming at the defects of the prior art. According to the method, the surface of the processed 3D printed metal workpiece is subjected to continuous pressure flushing circulation by using the circulating system to extract the oxidizing solution in the micro-arc oxidation process, and the micro-arc oxidation is performed by combining the steady step up-flow method, so that the uniformity of the surface oxidation film layer and the arc light of the processed 3D printed metal workpiece in the micro-arc oxidation process is improved, the phenomena of ablation and powder generation of the micro-arc oxidation film layer are avoided, and the quality of the micro-arc oxidation film layer is improved.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a preparation method of a 3D printed metal surface micro-arc oxidation film layer is characterized by comprising the following steps:
step one, surface treatment: carrying out surface sand blasting treatment on the 3D printed metal workpiece until the surface roughness Ra is 8-15, and then carrying out ultrasonic cleaning by adopting deionized water to obtain a treated 3D printed metal workpiece;
step two, preparing an oxidizing solution: preparing a mixed solution of sodium silicate, sodium tungstate, polytetrafluoroethylene lubricating particles and sodium hydroxide to obtain an oxidizing solution;
step three, preparing a micro-arc oxidation film layer: placing the processed 3D printed metal workpiece obtained in the first step into a stainless steel tank of direct-current pulse oxidation power supply equipment, wherein the stainless steel tank is filled with the oxidation solution obtained in the second step, the stainless steel tank and the processed 3D printed metal workpiece are correspondingly connected with a negative electrode and a positive electrode of a power supply of the direct-current pulse oxidation power supply equipment respectively, and then performing micro-arc oxidation by adopting a steady step up-flow method to form a micro-arc oxidation film layer on the surface of the processed 3D printed metal workpiece; the surface of the 3D who utilizes circulation system extraction oxidation solution to print metal workpiece after the processing carries out the pressure and washes of persistence among the micro arc oxidation's process, the circulation system is including being located the 3D who handles and printing metal workpiece top and the relative pipeline I and the pipeline II that sets up, and pipeline I and pipeline II and the 3D who handles after print metal workpiece's contained angle theta and distance D all can be adjusted.
According to the invention, the included angle theta between the pipeline I and the pipeline II and the processed 3D printing metal workpiece is the included angle between the pipeline I and the pipeline II and the processed 3D printing metal workpiece, and the distance D between the pipeline I and the pipeline II and the processed 3D printing metal workpiece is the vertical distance between the central point of the pipeline I and the pipeline II and the central point of the processed 3D printing metal workpiece.
The invention places the 3D printed metal workpiece with the surface subjected to sand blasting treatment and cleaning in a direct current pulse oxidation power supply device for micro-arc oxidation, utilizes a circulating system to extract an oxidation solution to carry out continuous pressure washing circulation on the surface of the treated 3D printed metal workpiece in the process of micro-arc oxidation, combines and controls the pipeline structure of the circulating system and the adjustable included angle theta and distance D between the pipeline and the treated 3D printed metal workpiece, so that the pipeline outlet of the circulating system can change in a larger angle range and distance range relative to the treated 3D printed metal workpiece, ensures that the surface of each part in the treated 3D printed metal workpiece is circularly washed by the oxidation solution from top to bottom, improves the uniformity of micro-arc oxidation, and further improves the uniformity of a micro-arc oxidation film layer formed on the surface of the treated 3D printed metal workpiece, the micro-arc oxidation is carried out by combining the steady step rising current method, so that the uniformity of the surface arc light of the 3D printed metal workpiece treated in the micro-arc oxidation process is further improved, the phenomena of film ablation and powder rising are avoided, and the quality of the micro-arc oxidation film is improved.
The preparation method of the micro-arc oxidation film layer on the 3D printed metal surface is characterized in that in the step one, the sand blasting pressure adopted by the surface sand blasting treatment is 0.5MPa to 1.5MPa, and the grain size of sand grains is 100 meshes to 250 meshes. According to the invention, by controlling the pressure of surface sand blasting and the grain size of sand, the surface roughness Ra of the 3D printed metal workpiece is effectively ensured to be 8-15, and the subsequent micro-arc oxidation process is facilitated.
The preparation method of the micro-arc oxidation film layer on the 3D printed metal surface is characterized in that the ultrasonic cleaning time in the step one is 10-15 min.
The preparation method of the micro-arc oxidation film layer on the 3D printed metal surface is characterized in that,in the second step, the content of sodium silicate in the oxidizing solution is 10-60 g/L, the content of sodium tungstate is 5-20 g/L, the content of polytetrafluoroethylene lubricating particles is 1-10 g/L, and the content of sodium hydroxide is 1-5 g/L. The oxidizing solution of the invention is added with sodium tungstate on the basis of the conventional sodium silicate, thereby forming WO in the micro-arc oxidation film layer3The high-temperature oxidation resistance of the micro-arc oxidation film is further improved, the micro-arc oxidation film is more compact by adding the polytetrafluoroethylene lubricating particles, and the binding force between the micro-arc oxidation film and the surface of the 3D printing metal workpiece is improved.
The preparation method of the micro-arc oxidation film layer on the 3D printed metal surface is characterized in that in the third step, in the process of micro-arc oxidation by adopting the steady-step current rise method, the increment value of the current density is controlled to be 0.5A/dm per 10min2～1A/dm2. According to the method, the current density is accelerated in the micro-arc oxidation process, so that the growth rate of the micro-arc oxidation film layer is controlled to be kept at a relatively constant value, the internal defects of the micro-arc oxidation film layer are reduced, and the quality of the micro-arc oxidation film layer is optimized.
The preparation method of the micro-arc oxidation film layer on the 3D printed metal surface is characterized in that in the third step, the power frequency of the micro-arc oxidation is 100 Hz-1000 Hz, the duty ratio is 10% -50%, the oxidation voltage is 0V-500V, and the oxidation time is 10 min-60 min.
The preparation method of the micro-arc oxidation film layer on the 3D printed metal surface is characterized in that theta is 10-90 degrees, D is 100-500 mm, the inner diameters of the pipeline I and the pipeline II are 10-100 mm, and the flow rates of the pipeline I and the pipeline II are 1 L.min-1～50L·min-1. By limiting theta to be 10-90 degrees, D to be 100-500 mm and the inner diameters of the pipeline I and the pipeline II to be 10-100 mm, the pipeline outlet of the circulating system is further guaranteed to change in a larger angle range and distance range relative to the processed 3D printed metal workpiece, so that the surface circulating washing uniformity of the oxidizing solution on each part of the processed 3D printed metal workpiece is improved, and the uniformity of micro-arc oxidation is improved.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the surface of the processed 3D printed metal workpiece is subjected to continuous pressure flushing circulation by using the circulating system to extract the oxidizing solution in the micro-arc oxidation process, so that the uniformity of micro-arc oxidation is improved, and meanwhile, the micro-arc oxidation is performed by combining the steady-step up-flow method, so that the uniformity of the surface oxidation film layer and the arc light of the processed 3D printed metal workpiece in the micro-arc oxidation process is improved, the phenomena of ablation and powdering of the micro-arc oxidation film layer are avoided, and the quality of the micro-arc oxidation film layer is improved.
2. According to the invention, by controlling the pipeline structure of the circulating system and adjusting the included angle and distance between the pipeline and the processed 3D printing metal workpiece, the pipeline outlet of the circulating system can change in a larger angle range and distance range relative to the processed 3D printing metal workpiece, the surface of each part in the processed 3D printing metal workpiece can be circularly washed by the oxidizing solution from top to bottom, and the uniformity of micro-arc oxidation is improved.
3. The micro-arc oxidation film layer prepared on the surface of the 3D printed metal workpiece is 5-100 mu m, the surface quality of the micro-arc oxidation film layer is good, and no ablation spots or loose powder layer is generated.
4. The bonding strength of the micro-arc oxidation film layer prepared on the surface of the 3D printed metal workpiece is more than 40MPa, the micro-arc oxidation film layer is oxidized for 50-100 h at 450 ℃ without peeling or stripping, and the micro-arc oxidation film layer is not peeled or stripped after being subjected to thermal shock test for 20-30 times at 400 ℃ in liquid nitrogen.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
Fig. 1 is a positional relationship diagram of the circulation system of the present invention and a processed 3D printed metal workpiece.
Fig. 2 is a scanned view of a micro-arc oxide film formed on the surface of a processed 3D printed metal workpiece according to embodiment 3 of the present invention.
Detailed Description
Example 1
The embodiment comprises the following steps:
step one, surface treatment: performing surface sand blasting on the 3D printed metal workpiece until the surface roughness Ra is 15, and then performing ultrasonic cleaning for 10min by using deionized water to obtain a processed 3D printed metal workpiece; the sand blasting pressure adopted by the surface sand blasting treatment is 0.5MPa, and the grain size of sand grains is 100 meshes;
step two, preparing an oxidizing solution: preparing a mixed solution of sodium silicate, sodium tungstate, Polytetrafluoroethylene (PTFE) lubricating particles and sodium hydroxide to obtain an oxidizing solution; the content of sodium silicate in the oxidation solution is 10g/L, the content of sodium tungstate is 5g/L, the content of Polytetrafluoroethylene (PTFE) lubricating particles is 1g/L, and the content of sodium hydroxide is 1 g/L;
step three, preparing a micro-arc oxidation film layer: placing the processed 3D printing metal workpiece obtained in the step one into a stainless steel tank of direct current pulse oxidation power supply equipment, wherein the stainless steel tank is filled with the oxidation solution obtained in the step two, the stainless steel tank and the processed 3D printing metal workpiece are correspondingly connected with the negative electrode and the positive electrode of a power supply of the direct current pulse oxidation power supply equipment respectively, then performing micro-arc oxidation by adopting a steady step current rise method, and controlling the increment value of the current density to be 0.5A/dm per 10min2The micro-arc oxidation power supply frequency is 100Hz, the duty ratio is 10%, the oxidation voltage is 0V-300V, the oxidation time is 10min, a micro-arc oxidation film layer is formed on the surface of the processed 3D printed metal workpiece, and after the micro-arc oxidation is finished, the 3D printed metal workpiece with the micro-arc oxidation film layer is taken out by closing equipment, cleaned and dried; micro arc oxidation's in-process utilizes circulation system extraction oxidation solution to carry out the pressure flushing of persistence to the surface of the 3D who handles after the 3D prints metal work piece, as shown in figure 1, the circulation system is including being located the 3D who handles after printing metal work piece top and the relative pipeline I and pipeline II that sets up, pipeline I and pipeline II and the 3D who handles after printing metal work piece contained angle theta is 10, and distance D is 100mm, and pipeline I and pipeline II's internal diameter is 10mm, and pipeline I and pipeline II's flow is 1L min-1。
According to detection, a micro-arc oxidation film layer with the thickness of 5 microns is formed on the surface of the 3D printed metal workpiece in the embodiment, the bonding strength is 41MPa, the micro-arc oxidation film layer is oxidized for 50 hours at 450 ℃ without peeling or stripping, and the micro-arc oxidation film layer is not peeled or stripped after being subjected to a thermal shock test for 20 times at 400 ℃ in liquid nitrogen.
Example 2
The embodiment comprises the following steps:
step one, surface treatment: carrying out surface sand blasting treatment on the 3D printed metal workpiece until the surface roughness Ra is 12, and then carrying out ultrasonic cleaning for 12min by adopting deionized water to obtain a treated 3D printed metal workpiece; the sand blasting pressure adopted by the surface sand blasting treatment is 1MPa, and the grain size of sand grains is 200 meshes;
step two, preparing an oxidizing solution: preparing a mixed solution of sodium silicate, sodium tungstate, Polytetrafluoroethylene (PTFE) lubricating particles and sodium hydroxide to obtain an oxidizing solution; the content of sodium silicate in the oxidation solution is 30g/L, the content of sodium tungstate is 10g/L, the content of Polytetrafluoroethylene (PTFE) lubricating particles is 5g/L, and the content of sodium hydroxide is 2 g/L;
step three, preparing a micro-arc oxidation film layer: placing the processed 3D printing metal workpiece obtained in the step one into a stainless steel tank of direct current pulse oxidation power supply equipment, wherein the stainless steel tank is filled with the oxidation solution obtained in the step two, the stainless steel tank and the processed 3D printing metal workpiece are correspondingly connected with the negative electrode and the positive electrode of a power supply of the direct current pulse oxidation power supply equipment respectively, then performing micro-arc oxidation by adopting a steady step current rise method, and controlling the increment value of the current density to be 0.8A/dm per 10min2The micro-arc oxidation power supply frequency is 600Hz, the duty ratio is 20%, the oxidation voltage is 0V-400V, the oxidation time is 30min, a micro-arc oxidation film layer is formed on the surface of the processed 3D printed metal workpiece, and after the micro-arc oxidation is finished, the 3D printed metal workpiece with the micro-arc oxidation film layer is taken out by closing equipment, cleaned and dried; micro arc oxidation's in-process utilizes circulation system extraction oxidation solution to carry out the pressure wash of persistence to the surface of the 3D who handles after the 3D prints metal work piece, as shown in figure 1, circulation system is including being located the 3D who handles after print metal work piece top and relative pipeline I and pipeline II that sets up, and pipeline I and pipeline II and the 3D who handles after print metal work piece contained angle theta be 60, and distance D is 300mm, and pipeline I and pipeline IIThe inner diameter of the pipeline I and the inner diameter of the pipeline II are both 60mm, and the flow rates of the pipeline I and the pipeline II are both 30 L.min-1。
According to detection, a micro-arc oxidation film layer with the thickness of 60 microns is formed on the surface of the 3D printed metal workpiece in the embodiment, the bonding strength is 40.2MPa, the micro-arc oxidation film layer is oxidized for 100 hours at 450 ℃ and does not have peeling and stripping phenomena, and the micro-arc oxidation film layer is not peeled and stripped after being subjected to a thermal shock test for 30 times at 400 ℃ in liquid nitrogen.
Fig. 2 is a scanned image of the micro-arc oxidation film layer formed on the surface of the processed 3D printed metal workpiece in this embodiment, and as can be seen from fig. 2, the surface of the micro-arc oxidation film layer is uniform and consistent, and has no ablation spots and powdery loose layer, which illustrates that the method of the present invention improves the quality of the micro-arc oxidation film layer.
Example 3
The embodiment comprises the following steps:
step one, surface treatment: carrying out surface sand blasting treatment on the 3D printed metal workpiece until the surface roughness Ra is 8, and then carrying out ultrasonic cleaning for 15min by using deionized water to obtain a treated 3D printed metal workpiece; the sand blasting pressure adopted by the surface sand blasting treatment is 1.5MPa, and the grain size of sand grains is 250 meshes;
step two, preparing an oxidizing solution: preparing a mixed solution of sodium silicate, sodium tungstate, Polytetrafluoroethylene (PTFE) lubricating particles and sodium hydroxide to obtain an oxidizing solution; the content of sodium silicate in the oxidizing solution is 60g/L, the content of sodium tungstate is 20g/L, the content of Polytetrafluoroethylene (PTFE) lubricating particles is 10g/L, and the content of sodium hydroxide is 5 g/L;
step three, preparing a micro-arc oxidation film layer: placing the processed 3D printed metal workpiece obtained in the step one into a stainless steel tank of direct current pulse oxidation power supply equipment, wherein the stainless steel tank is filled with the oxidation solution obtained in the step two, the stainless steel tank and the processed 3D printed metal workpiece are correspondingly connected with the negative electrode and the positive electrode of a power supply of the direct current pulse oxidation power supply equipment respectively, then performing micro-arc oxidation by adopting a steady step current rise method, and controlling the increment value of the current density to be 1A/dm every 10min2The micro-arc oxidation has a power supply frequency of 1000Hz, a duty ratio of 50%, an oxidation voltage of 0V-500V, and oxygenThe chemical treatment time is 60min, a micro-arc oxidation film layer is formed on the surface of the processed 3D printed metal workpiece, and after micro-arc oxidation is finished, the 3D printed metal workpiece with the micro-arc oxidation film layer is taken out by closing equipment, cleaned and dried; micro arc oxidation's in-process utilizes circulation system extraction oxidation solution to carry out the pressure wash of continuation to the surface of the 3D who handles after printing metal work piece, as shown in figure 1, the circulation system is including being located the 3D who handles after printing metal work piece top and pipeline I and the pipeline II that sets up relatively, and pipeline I and pipeline II and the 3D who handles after printing metal work piece's contained angle theta is 90, and distance D is 500mm, and pipeline I and pipeline II's internal diameter is 100mm, and pipeline I and pipeline II's flow is 50L min-1。
According to detection, a micro-arc oxidation film layer with the thickness of 100 microns is prepared and formed on the surface of the 3D printed metal workpiece, the bonding strength is 43MPa, the micro-arc oxidation film layer is oxidized at 450 ℃ for 60 hours without peeling or stripping, and the micro-arc oxidation film layer is not peeled or stripped after being subjected to a thermal shock test for 20 times at 400 ℃ in liquid nitrogen.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.
Claims (7)
1. A preparation method of a 3D printed metal surface micro-arc oxidation film layer is characterized by comprising the following steps:
step one, surface treatment: carrying out surface sand blasting treatment on the 3D printed metal workpiece until the surface roughness Ra is 8-15, and then carrying out ultrasonic cleaning by adopting deionized water to obtain a treated 3D printed metal workpiece;
step two, preparing an oxidizing solution: preparing a mixed solution of sodium silicate, sodium tungstate, polytetrafluoroethylene lubricating particles and sodium hydroxide to obtain an oxidizing solution;
step three, preparing a micro-arc oxidation film layer: placing the processed 3D printed metal workpiece obtained in the first step into a stainless steel tank of a direct-current pulse oxidation power supply device, wherein the stainless steel tank is filled with the oxidation solution obtained in the second step, the stainless steel tank and the processed 3D printed metal workpiece are correspondingly connected with the negative electrode and the positive electrode of a power supply of the direct-current pulse oxidation power supply device respectively, and then performing micro-arc oxidation by adopting a steady-step current rise method to form a micro-arc oxidation film layer on the surface of the processed 3D printed metal workpiece; the surface of the 3D who utilizes circulation system extraction oxidation solution to print metal workpiece after the processing carries out the pressure and washes of persistence among the micro arc oxidation's process, the circulation system is including being located the 3D who handles and printing metal workpiece top and the relative pipeline I and the pipeline II that sets up, and pipeline I and pipeline II and the 3D who handles after print metal workpiece's contained angle theta and distance D all can be adjusted.
2. The method for preparing the micro-arc oxide film layer on the metal surface through 3D printing according to claim 1, wherein the sand blasting pressure adopted in the surface sand blasting treatment in the step one is 0.5MPa to 1.5MPa, and the grain size of sand grains is 100 to 250 meshes.
3. The method for preparing the micro-arc oxide film layer on the surface of the 3D printed metal according to claim 1, wherein the ultrasonic cleaning time in the step one is 10-15 min.
4. The method for preparing the micro-arc oxidation film layer on the metal surface for 3D printing according to claim 1, wherein in the second step, the content of sodium silicate in the oxidation solution is 10 g/L-60 g/L, the content of sodium tungstate is 5 g/L-20 g/L, the content of polytetrafluoroethylene lubricating particles is 1 g/L-10 g/L, and the content of sodium hydroxide is 1 g/L-5 g/L.
5. The method for preparing a micro-arc oxidation film layer on a 3D printed metal surface according to claim 1, wherein in the third step, the increase of the current density is controlled to be 0.5A/dm per 10min in the micro-arc oxidation process by the steady step up-flow method2～1A/dm2。
6. The method for preparing the micro-arc oxidation film layer on the metal surface for 3D printing according to claim 1, wherein in the third step, the power frequency of the micro-arc oxidation is 100Hz to 1000Hz, the duty ratio is 10 percent to 50 percent, the oxidation voltage is 0V to 500V, and the oxidation time is 10min to 60 min.
7. The method for preparing the micro-arc oxidation film layer on the metal surface through 3D printing according to claim 1, wherein theta ranges from 10 degrees to 90 degrees, D ranges from 100mm to 500mm in the third step, the inner diameters of the pipeline I and the pipeline II both range from 10mm to 100mm, and the flow rates of the pipeline I and the pipeline II both range from 1 L.min-1～50L·min-1。
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105386099A (en) * | 2015-11-10 | 2016-03-09 | 西华大学 | 3D printing micro-arc oxidation film device and method |
| CN111321440A (en) * | 2020-04-22 | 2020-06-23 | 哈尔滨工业大学 | Preparation method of metal surface composite coating and modified metal material |
| CN111347038A (en) * | 2018-12-21 | 2020-06-30 | 广州中国科学院先进技术研究所 | Preparation method of 3D printing titanium implant with active gradient composite film layer on surface |
| CN113441732A (en) * | 2021-06-30 | 2021-09-28 | 西安赛福斯材料防护有限责任公司 | Preparation method of 3D printing titanium alloy surface thermal protection film layer for electric propulsion system |
| CN113564660A (en) * | 2021-07-19 | 2021-10-29 | 西安理工大学 | Preparation method of titanium alloy high-density micro-arc oxidation film layer |
-
2022
- 2022-04-02 CN CN202210350003.2A patent/CN114481252A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105386099A (en) * | 2015-11-10 | 2016-03-09 | 西华大学 | 3D printing micro-arc oxidation film device and method |
| CN111347038A (en) * | 2018-12-21 | 2020-06-30 | 广州中国科学院先进技术研究所 | Preparation method of 3D printing titanium implant with active gradient composite film layer on surface |
| CN111321440A (en) * | 2020-04-22 | 2020-06-23 | 哈尔滨工业大学 | Preparation method of metal surface composite coating and modified metal material |
| CN113441732A (en) * | 2021-06-30 | 2021-09-28 | 西安赛福斯材料防护有限责任公司 | Preparation method of 3D printing titanium alloy surface thermal protection film layer for electric propulsion system |
| CN113564660A (en) * | 2021-07-19 | 2021-10-29 | 西安理工大学 | Preparation method of titanium alloy high-density micro-arc oxidation film layer |
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