CN114540903A - Method for regulating and controlling thermoelectric chemical oxidation - Google Patents
Method for regulating and controlling thermoelectric chemical oxidation Download PDFInfo
- Publication number
- CN114540903A CN114540903A CN202210106263.5A CN202210106263A CN114540903A CN 114540903 A CN114540903 A CN 114540903A CN 202210106263 A CN202210106263 A CN 202210106263A CN 114540903 A CN114540903 A CN 114540903A
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- magnetic field
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- plating tank
- chemical oxidation
- thermoelectric chemical
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- 230000003647 oxidation Effects 0.000 title claims abstract description 41
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 41
- 239000000126 substance Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 37
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 19
- 230000001276 controlling effect Effects 0.000 title claims description 8
- 238000007747 plating Methods 0.000 claims abstract description 44
- 238000006056 electrooxidation reaction Methods 0.000 claims abstract description 11
- 239000003792 electrolyte Substances 0.000 claims abstract description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 11
- 229910052782 aluminium Inorganic materials 0.000 claims description 11
- 239000004020 conductor Substances 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 4
- 238000002679 ablation Methods 0.000 abstract description 10
- 210000002381 plasma Anatomy 0.000 description 36
- 230000002776 aggregation Effects 0.000 description 5
- 238000004220 aggregation Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 4
- 238000005457 optimization Methods 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000036470 plasma concentration Effects 0.000 description 1
- 238000007745 plasma electrolytic oxidation reaction Methods 0.000 description 1
Images
Classifications
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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
- C25D11/026—Anodisation with spark discharge
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D21/00—Processes for servicing or operating cells for electrolytic coating
- C25D21/12—Process control or regulation
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Automation & Control Theory (AREA)
- Chemically Coating (AREA)
Abstract
A method of regulating a thermoelectric chemical oxidation, comprising the steps of: placing a workpiece to be processed in a plating tank filled with electrolyte, wherein the workpiece to be processed and the electrolyte are respectively connected with a thermoelectric chemical oxidation power supply; and a magnetic field component is also arranged beside the plating tank, so that the surface of the workpiece to be treated, which is subjected to the thermal electrochemical oxidation, is positioned in a magnetic field, and the direction of the magnetic field component is vertical to the surface of the workpiece to be treated, which is subjected to the thermal electrochemical oxidation, or the intensity of the magnetic field is periodically changed. According to the regulating method for the thermoelectric chemical oxidation, the movement of the plasma in the thermoelectric chemical oxidation process is regulated and controlled through the external magnetic field, the concentration of the plasma in the thermoelectric chemical oxidation process is reduced, the intensity of the plasma is reduced, and uneven ablation is avoided.
Description
Technical Field
The invention relates to the technical field of surface treatment, in particular to a regulating and controlling method for thermoelectric chemical oxidation.
Background
The thermoelectric chemical oxidation is also called micro plasma oxidation, plasma thermoelectric chemical oxidation, plasma enhanced electrochemical surface ceramic oxidation and the like, and the working voltage is higher. However, during the thermo-electrochemical oxidation of materials, excessive plasma concentrations can cause uneven ablation on the surface of the material, which can affect the quality of the surface treatment.
Disclosure of Invention
The invention aims to provide a regulating method of thermoelectric chemical oxidation, which regulates and controls the movement of plasmas in the thermoelectric chemical oxidation process through an auxiliary magnetic field, reduces the aggregation of the plasmas in the micro-arc oxidation process, reduces the intensity of the plasmas, and avoids uneven ablation, thereby realizing the optimization of the thermoelectric chemical oxidation process.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a method of regulating a thermoelectric chemical oxidation, comprising the steps of:
(1) placing a workpiece to be processed in a plating tank filled with electrolyte, wherein the workpiece to be processed and the electrolyte are respectively connected with a thermoelectric chemical oxidation power supply;
(2) and a magnetic field component is also arranged beside the plating tank, so that the surface of the workpiece to be treated, which is subjected to the thermal electrochemical oxidation, is positioned in a magnetic field, and the direction of the magnetic field component is vertical to the surface of the workpiece to be treated, which is subjected to the thermal electrochemical oxidation, or the magnetic field intensity of each magnetic field component is periodically changed.
Further, the workpiece to be processed in the step (1) is a flat aluminum wire, two ends of the flat aluminum wire are respectively wound on the unwinding device and the winding device, the plating tank comprises a first plating tank and a second plating tank, the first plating tank and the second plating tank are two cylindrical electrodes, a conductor wire penetrates through electrolyte along the axis of the cylindrical electrodes under the traction of the winding device, the first plating tank and the second plating tank are respectively connected with a thermoelectric chemical oxidation power supply,
the number of the magnetic field components in the step (2) is 4, 2 groups of the 4 magnetic field components are symmetrically distributed outside the plating bath along the conductor wire, and the direction of the magnetic field in each group of the magnetic field components is perpendicular to the flat aluminum wire.
Further, the magnetic field component is a solenoid or a permanent magnet.
Furthermore, the number of the magnetic field components in the step (2) is not less than 3, the magnetic field components are distributed around the plating tank, and the magnetic field intensity of the magnetic field components is periodically and sequentially adjusted at different moments in the thermoelectric chemical oxidation process, so that a magnetic field rotating around the workpiece to be processed is generated around the plating tank.
Furthermore, the magnetic field components are solenoids, and the current in each solenoid is periodically and sequentially regulated at different moments in the thermoelectric chemical oxidation process, so that a dynamically rotating magnetic field is generated around the plating bath.
Furthermore, the magnetic field components are distributed on the same circular ring at equal intervals around the plating tank, and the workpiece to be processed is positioned at the center of the circular ring.
Compared with the prior art, the invention has the beneficial technical effects that:
according to the regulating method of the thermoelectric chemical oxidation, the movement of plasmas in the thermoelectric chemical oxidation process is regulated and controlled through the external magnetic field, the aggregation of the plasmas in the thermoelectric chemical oxidation process is reduced, the intensity of the plasmas is reduced, and uneven ablation is avoided, so that the optimization of the thermoelectric chemical oxidation process is realized;
the longitudinal magnetic field is applied in the direction vertical to the surface of the plated part, and the longitudinal magnetic field parallel to the axis of the plasma is utilized to regulate the form of the plasma in the thermoelectric chemical oxidation process, inhibit the aggregation of the plasma and reduce the intensity of the plasma; the current threshold value of anode spot formation is improved, so that the plasma can be still maintained in a diffusion state under the condition of large current, and the ablation of the material is greatly reduced.
The Lorentz force is applied to the plasma through the transverse magnetic field perpendicular to the axis of the plasma, so that the arc is promoted to move and cool, the combustion time of the plasma is shortened, uneven ablation is avoided, the time required by the plasma to start moving can be shortened by increasing the transverse magnetic field, and the effect of promoting the plasma to move is achieved.
Drawings
FIG. 1 is a schematic view showing the structure of an apparatus used in a method for regulating and controlling a thermoelectric chemical oxidation in example 1 of the present invention;
FIG. 2 is a schematic diagram of the principle of controlling the morphology of a plasma by a magnetic field in example 1 of the present invention, in which the left diagram shows no magnetic field applied and the right diagram shows a magnetic field applied;
FIG. 3 is a schematic view of the structure of an apparatus for use in a method for regulating and controlling a thermoelectric chemical oxidation in example 2 of the present invention;
FIG. 4 is a schematic structural diagram of an apparatus for regulating a thermoelectric chemical oxidation method by a rotating magnetic field in embodiment 4 of the present invention.
The specific implementation mode is as follows:
the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments.
Example 1
As shown in fig. 1, the magnetic field regulation based thermoelectric chemical oxidation apparatus includes a first plating tank 2 and a second plating tank 3, the plating tanks are provided with electrolytes, cylindrical first electrodes 4 and second electrodes 5 are respectively disposed in the two plating tanks, and a flat aluminum wire 1 passes through the first plating tank 2, the second plating tank 3 and the first electrodes 4 and the second electrodes 5 therein (the thermoelectric chemical oxidation apparatus is a prior art, and the specific structure and the working principle thereof are disclosed in chinese patent No. CN 2021116747753). Further, a solenoid 6 as an external magnetic field component is included. Two groups of 4 spiral coils 6 are symmetrically distributed along the flat aluminum wire 1 outside the plating bath.
The device of the invention utilizes a longitudinal magnetic field parallel to the axis of the plasma to regulate the plasma form. The longitudinal magnetic field can inhibit the aggregation of plasma, raise the current threshold of anode spot, make the plasma still maintain in diffusion state under the heavy current, greatly reduce the ablation of the material. In the aspect of regulating and controlling the plasma by the longitudinal magnetic field, the longitudinal magnetic field basically has the function of enabling electrons to rotate around magnetic lines of the longitudinal magnetic field, so that radial contraction or diffusion of the electrons is limited, and as the movement of the electrons is limited, the electrostatic force in the plasma can limit the movement of ions, so that the radial loss of the plasma is reduced. As shown in fig. 2, when the electrochemical oxidation is performed, a ceramic film layer 101 is formed on the flat aluminum wire 1, and when a magnetic field is not applied (fig. 2, left), the plasma 102 is highly concentrated, which causes the plasma 102 to have a high temperature and a high intensity, and thus, uneven ablation is easily caused; after the magnetic field is applied (right in fig. 2), the longitudinal magnetic field can inhibit the aggregation of the plasma 102, improve the current threshold value for forming the anode spot, ensure that the plasma 102 can still be maintained in a diffusion state under the condition of large current, and greatly reduce the ablation of materials.
Example 2
As shown in FIG. 3, the present embodiment is different from embodiment 1 in that only one plating bath and one electrode are used, the flat aluminum wire 1 and the cylindrical electrode 4 are respectively connected with a thermal electrochemical oxidation power supply, and a pair of spiral coils 6 are symmetrically distributed on two sides of the flat aluminum wire 1. The circuit of the spiral coil connected with the direct current power supply is also provided with a current adjusting device, and the current is adjusted according to different process parameters in the thermoelectric chemical oxidation process, so that the magnetic field intensity is adjusted and controlled.
Example 3
Compared with the embodiment 1, the rotating magnetic field regulation and control thermoelectric chemical oxidation device has the advantages that the number of the magnetic field components is multiple, and the magnetic field components are distributed around the plating tank at equal intervals. Preferably, the magnetic field components are distributed on the same ring around the plating bath, and the workpiece to be treated is positioned in the center of the ring. The magnetic field component is a solenoid, and the current in each solenoid is periodically and sequentially regulated at different moments in the thermoelectric chemical oxidation process, so that a rotating magnetic field is generated around the plating tank, electric arcs are promoted to move and reduce the temperature, the plasma combustion time is shortened, the movement of plasmas in the thermoelectric chemical oxidation process is regulated and controlled, the concentration of plasmas in the thermoelectric chemical oxidation process is reduced, uneven ablation is avoided, and the optimization of the thermoelectric chemical oxidation process is realized. The increase of the transverse magnetic field can also shorten the time required by the plasma to start moving, and plays a role in promoting the plasma to move
Example 4
As shown in FIG. 4, the device for thermoelectric chemical oxidation based on rotating magnetic field regulation comprises a plating bath 9, an electrode 8 and a cuboid workpiece 7 to be treated, wherein 4 solenoids 6 are distributed at equal intervals around the plating bath 9, and the current in the 4 solenoids 6 is periodically and sequentially regulated in the thermoelectric chemical oxidation process, so that a dynamically changing spiral magnetic field is generated around the plating bath 9.
Claims (6)
1. A method for regulating and controlling thermoelectric chemical oxidation is characterized by comprising the following steps:
(1) placing a workpiece to be processed in a plating tank filled with electrolyte, wherein the workpiece to be processed and the electrolyte are respectively connected with a thermoelectric chemical oxidation power supply;
(2) and a plurality of magnetic field components are also arranged beside the plating tank, so that the surface of the workpiece to be treated, which is subjected to the thermal electrochemical oxidation, is positioned in a magnetic field, and the direction of the magnetic field components is vertical to the surface of the workpiece to be treated, which is subjected to the thermal electrochemical oxidation, or the magnetic field intensity of each magnetic field component is periodically changed.
2. The method according to claim 1, wherein the workpiece to be processed in the step (1) is a flat aluminum wire, two ends of the flat aluminum wire are respectively wound on the unwinding device and the winding device, the plating tank comprises a first plating tank and a second plating tank, the first plating tank and the second plating tank are two cylindrical electrodes, the conductor wire penetrates through the electrolyte along the axis of the cylindrical electrodes under the traction of the winding device, the first plating tank and the second plating tank are respectively connected with a thermoelectric chemical oxidation power supply,
the number of the magnetic field components in the step (2) is 4, 2 groups of the 4 magnetic field components are symmetrically distributed outside the plating bath along the conductor wire, and the direction of the magnetic field in each group of the magnetic field components is perpendicular to the flat aluminum wire.
3. The method of claim 1, wherein the magnetic field component is a solenoid or a permanent magnet.
4. The method of claim 1, wherein the number of the magnetic field components in the step (2) is not less than 3, the magnetic field components are distributed around the plating bath, and the magnetic field strength of the magnetic field components is periodically and sequentially adjusted at different moments in the process of the thermo-electrochemical oxidation, so that a magnetic field rotating around the workpiece to be processed is generated around the plating bath.
5. The method of claim 4, wherein the magnetic field components are solenoids, and wherein the magnitude of the current in each solenoid is periodically adjusted in sequence at different times during the thermo-electrochemical oxidation process to generate a dynamically rotating magnetic field around the plating bath.
6. The method of claim 5, wherein the magnetic field elements are equally spaced around the plating bath on a common ring, the workpiece to be treated being located at the center of the ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210106263.5A CN114540903A (en) | 2022-01-28 | 2022-01-28 | Method for regulating and controlling thermoelectric chemical oxidation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210106263.5A CN114540903A (en) | 2022-01-28 | 2022-01-28 | Method for regulating and controlling thermoelectric chemical oxidation |
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| Publication Number | Publication Date |
|---|---|
| CN114540903A true CN114540903A (en) | 2022-05-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210106263.5A Pending CN114540903A (en) | 2022-01-28 | 2022-01-28 | Method for regulating and controlling thermoelectric chemical oxidation |
Country Status (1)
| Country | Link |
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| CN (1) | CN114540903A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1068411A (en) * | 1991-07-11 | 1993-01-27 | 北京市太阳能研究所 | The manufacture method of solar selective absorbing film and equipment |
| CN101845653A (en) * | 2010-04-14 | 2010-09-29 | 中国船舶重工集团公司第十二研究所 | Preparation method of micro-arc oxidation film layer under effect of magnetic field |
| CN113151875A (en) * | 2021-05-18 | 2021-07-23 | 西比里电机技术(苏州)有限公司 | Electromagnetic thermal coupling thermoelectric chemical oxidation equipment |
-
2022
- 2022-01-28 CN CN202210106263.5A patent/CN114540903A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1068411A (en) * | 1991-07-11 | 1993-01-27 | 北京市太阳能研究所 | The manufacture method of solar selective absorbing film and equipment |
| CN101845653A (en) * | 2010-04-14 | 2010-09-29 | 中国船舶重工集团公司第十二研究所 | Preparation method of micro-arc oxidation film layer under effect of magnetic field |
| CN113151875A (en) * | 2021-05-18 | 2021-07-23 | 西比里电机技术(苏州)有限公司 | Electromagnetic thermal coupling thermoelectric chemical oxidation equipment |
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Application publication date: 20220527 |
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