CN107447243B - Device for metal micro-arc oxidation unidirectional surface modification - Google Patents
Device for metal micro-arc oxidation unidirectional surface modification Download PDFInfo
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- CN107447243B CN107447243B CN201710465543.4A CN201710465543A CN107447243B CN 107447243 B CN107447243 B CN 107447243B CN 201710465543 A CN201710465543 A CN 201710465543A CN 107447243 B CN107447243 B CN 107447243B
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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
- C25D11/024—Anodisation under pulsed or modulated current or potential
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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
- C25D11/005—Apparatus specially adapted for electrolytic conversion coating
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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
- C25D11/022—Anodisation on selected surface areas
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention relates to a device for metal micro-arc oxidation unidirectional surface modification and a use method thereof. The device comprises a fastening bolt, an insulating pressing ring, a rubber sealing ring, a sample, a conductive cushion block, a stainless steel shielding frame, an insulating plastic outer frame, a conductive bolt, an insulating sheath and an anode circuit connected with a micro-arc oxidation power supply. The beneficial effects of the invention are as follows: 1. the device has good tightness, can realize unidirectional surface modification of the sample and the workpiece, and solves the problems that local surface modification is required due to the limitation of material performance requirements. 2. The stainless steel shielding frame in the device can shield the interference of the power line, and can ensure experimental precision. 3. The device can be suitable for samples with different thicknesses by adjusting and replacing conductive cushion blocks with different thicknesses. 4. The device has the characteristics of simple structure, easy manufacture, high precision, strong reliability and the like. The method is very suitable for the micro-arc oxidation unidirectional surface modification of various samples.
Description
Technical Field
The invention relates to the field of surface modification by micro-arc oxidation technology, in particular to a device for unidirectional surface modification by metal micro-arc oxidation.
Background
The micro-arc oxidation technology is a novel metal surface treatment technology which is raised in China in recent years, and the principle is that through matching adjustment of pulse electric parameters and electrolyte, micro-area arc discharge phenomenon is generated on the surface of light alloy such as aluminum, magnesium, titanium and the like by using the principles of plasma chemistry and electrochemistry, so that a ceramic layer grows in situ on the surface of metal, and the material has wider physical and chemical characteristics so as to adapt to higher requirements of modern industry on the material.
In the micro-arc oxidation modification process, a whole sample is required to be immersed in the solution, and due to the special structure of some materials, only a single surface of the material is required to be modified, and other parts are corroded or the performance of the material is changed due to contact with the solution.
Disclosure of Invention
The invention aims to solve the problems that local surface modification is needed and the like due to material performance requirement limitation, and provides a device for metal micro-arc oxidation unidirectional surface modification and a use method thereof. The device has the characteristics of simple structure, easy manufacture, high precision, strong reliability and the like. The method is very suitable for the micro-arc oxidation unidirectional surface modification of various samples.
The technical scheme for solving the technical problems is as follows:
the device for metal micro-arc oxidation unidirectional surface modification is formed by assembling n fastening bolts 1, n insulating pressing rings 2, n rubber sealing rings 3, a sample 4, a conductive cushion block 5, a stainless steel shielding frame 6, an insulating plastic outer frame 7, a conductive bolt 8, a conductive bolt insulating sheath 9 and an anode circuit 10 connected with a micro-arc oxidation power supply;
after assembly, any one of the n fastening bolts 1 penetrates through the corresponding insulating pressing ring and extends into the insulating outer frame 7, and the stainless steel shielding frame 6 is positioned in a space formed by the conductive cushion block and the insulating plastic outer frame 7 and is in close contact with the conductive cushion block and the insulating plastic outer frame 7;
after assembly, the conductive bolt is coated with an insulating sheath 9; the bottom of the conductive cushion block is penetrated through the insulating plastic outer frame 7 and the stainless steel shielding frame 6 and is embedded into a hole reserved by the conductive cushion block 5; the conductive bolt is also connected with an anode circuit 10 connected with a micro-arc oxidation power supply;
after assembly, the device is supposed to be cut along the surface A to obtain a section B, wherein the surface A is perpendicular to the bottom surface of the insulating plastic outer frame 7 and passes through 2 insulating pressing rings; projecting along the direction vertical to the section B to obtain a projection diagram, wherein on the projection diagram, a single insulating pressing ring is in a step shape, and a single rubber sealing ring is in an inverted convex shape;
definition: the distance from the bottom of the stainless steel shielding frame 6 to the plane where the top of the insulating plastic outer frame 7 is located on the projection view is L, and the distance from the bottom of the stainless steel shielding frame 6 to the plane where the top of the stainless steel shielding frame 6 is located on the projection view is P;
defining the height of the conductive cushion block as H; the H is less than P, and P is less than L; defining the height of the protruding part of the single rubber sealing ring as E and the total height of the inverted convex part as F; e+p=l; defining that the length of a single step is M, the total height is Q, the length of a step surface is R, the first step height S, the second step height T and the length of the second step U, and then S+T= Q, R +U=M; defining the width of the top of the insulating plastic outer frame 7 as V, and defining the single 'convex' type table edge as W, then u+w=v; defining the length of a single "convex" type bottom as X, then x=r.
The invention relates to a device for metal micro-arc oxidation unidirectional surface modification, wherein after assembly, a sample 4 is fixed through a conductive cushion block 5 and a rubber sealing ring.
The invention relates to a device for unidirectional surface modification of metal micro-arc oxidation, wherein n is any integer from 3 to 8; preferably 6 or 4.
The invention relates to a device for metal micro-arc oxidation unidirectional surface modification, which is characterized in that the width of the top of a single convex shape is defined as Y on a projection diagram, and the width of the top of the single convex shape is consistent with the width of the top of a stainless steel shielding frame 6.
The invention relates to a device for unidirectional surface modification of metal micro-arc oxidation, wherein the height E of a convex-shaped convex part is equal to L-P in a projection view.
The fastening bolt adopts an M8 specification bolt with the diameter of 8mm, and the conductive bolt adopts an M10 specification bolt with the diameter of 10 mm. The outer diameter of the insulating pressing ring is 210mm, the inner diameter of the insulating pressing ring is 150mm, and four uniformly symmetrical bolt through holes with the diameter of 9mm are drilled on the insulating pressing ring. The outer diameter of the insulating plastic outer frame is 210mm, the inner diameter of the insulating plastic outer frame is 170mm, M8-specification threaded holes are drilled at positions corresponding to the bolt through holes on the insulating pressing ring, and 11-mm bolt through holes are drilled at the center of the bottom. The outer diameter of the stainless steel shielding frame is 170mm, the inner diameter of the stainless steel shielding frame is 160mm, and a M10 specification threaded hole is drilled in the center of the bottom. The outer diameter of the rubber sealing ring is 180mm, and the inner diameter of the rubber sealing ring is 150mm.
The test sample is arranged on the conductive cushion block, and a rubber sealing ring is sleeved on the stainless steel shielding frame and the edge of the test sample; the insulating pressing ring is connected with the insulating plastic outer frame through four fastening bolts, and the insulating pressing ring and the insulating plastic outer frame are fastened.
The micro-arc oxidation power supply anode line is connected with the conductive bolt.
The application method of the device for metal micro-arc oxidation unidirectional surface modification comprises the following steps:
step 1: after the whole device is equipped, the sample is placed on the conductive cushion block, and then a rubber sealing ring is sleeved on the stainless steel shielding frame and the edge of the sample.
Step 2: and (3) the bolt through holes on the insulating pressing ring and the insulating plastic outer frame threaded holes are opposite to each other, and the fastening bolts are screwed down to enable the sealing rubber ring to be in close contact with the sample.
Step 3: according to the thickness of the sample, the conductive cushion blocks with different thicknesses can be replaced to meet the experimental requirements.
Step 4: and a micro-arc oxidation power supply anode line is connected to the conductive bolt.
Step 5: the device with the sample is placed in an electrolytic tank, so that the surface of the sample is completely placed in the electrolyte, and the proper depth is adjusted, so that the sample is kept parallel to the electrolyte level.
Step 6: according to the preselected parameters, experimental parameters and experimental conditions are set, and a power supply is switched on to perform micro-arc oxidation treatment.
The beneficial effects of the invention are as follows:
1. according to the invention, the rubber sealing inverted convex sealing ring with the outer edge is adopted for the first time, and the sealing ring is matched with the fastening bolt, the conductive cushion block and the stainless steel shielding frame precisely, so that perfect sealing of the device is realized, and further unidirectional surface modification of a sample and a workpiece can be realized, so that the problems that local surface modification is required due to the limitation of material performance requirements and the like are solved.
2. The stainless steel shielding frame in the device can shield the interference of the power line, and can ensure experimental precision.
3. The device can be suitable for samples with different thicknesses by adjusting and replacing conductive cushion blocks with different thicknesses.
4. The device has the characteristics of simple structure, easy manufacture, high precision, strong reliability and the like. The method is very suitable for the micro-arc oxidation unidirectional surface modification of various samples.
Drawings
FIG. 1 is a schematic structural diagram of a unidirectional surface modification apparatus for metal micro-arc oxidation according to the present invention.
FIG. 2 is a schematic illustration of a projection view;
FIG. 3 is a schematic illustration of a partial projection view;
in the figure: the power supply circuit is connected with the power supply circuit through the fastening bolt 1, the insulating pressing ring 2, the rubber sealing ring 3, the sample 4, the conductive cushion block 5, the stainless steel shielding frame 6, the insulating plastic outer frame 7, the conductive bolt 8, the insulating sheath 9 and the power supply circuit 10.
Detailed Description
The invention relates to a device for metal micro-arc oxidation unidirectional surface modification and a use method thereof, and is further described below with reference to the accompanying drawings and the detailed description.
The structure of the cross section of the unidirectional surface modification device for metal micro-arc oxidation is shown in figure 1.
Definition: the distance from the bottom of the stainless steel shielding frame 6 to the plane where the top of the insulating plastic outer frame 7 is located on the projection view is L, and the distance from the bottom of the stainless steel shielding frame 6 to the plane where the top of the stainless steel shielding frame 6 is located on the projection view is P;
defining the height of the conductive cushion block as H; the H is less than P, and P is less than L; defining the height of the protruding part of the single rubber sealing ring as E and the total height of the inverted convex part as F; e+p=l; defining that the length of a single step is M, the total height is Q, the length of a step surface is R, the first step height S, the second step height T and the length of the second step U, and then S+T= Q, R +U=M; defining the width of the top of the insulating plastic outer frame 7 as V, and defining the single 'convex' type table edge as W, then u+w=v; defining the length of a single "convex" type bottom as X, then x=r. See in particular figures 2 and 3.
In this embodiment, n is selected to be 6.
The projection of the device for metal micro-arc oxidation unidirectional surface modification designed in this embodiment defines a single "convex" type top width Y, which is identical to the width of the top of the stainless steel shielding frame 6.
The projected pattern of the device designed in this example for metal micro-arc oxidation unidirectional surface modification has a height E of the "convex" type protruding portion equal to L-P.
The device for micro-arc oxidation unidirectional surface modification consists of a fastening bolt 1, an insulating pressing ring 2, a rubber sealing ring 3, a sample 4, a conductive cushion block 5, a stainless steel shielding frame 6, an insulating plastic outer frame 7, a conductive bolt 8, an insulating sheath 9 and an anode circuit 10 connected with a micro-arc oxidation power supply. The fastening bolt 1 adopts a bolt with the diameter of 8mm in the M8 specification, and the conductive bolt 8 adopts a bolt with the diameter of 10mm in the M10 specification. The outer diameter of the insulation pressing ring 2 is 210mm, the inner diameter of the insulation pressing ring is 150mm, and four uniformly symmetrical bolt through holes with the diameter of 9mm are drilled in the insulation pressing ring 2. The outer diameter of the insulating plastic outer frame 7 is 210mm, the inner diameter is 170mm, M8-specification threaded holes are drilled at positions corresponding to the bolt through holes on the insulating pressing ring 2, and 11-mm bolt through holes are drilled at the center of the bottom. The outer diameter of the stainless steel shielding frame 6 is 170mm, the inner diameter is 160mm, and a M10 specification threaded hole is drilled in the center of the bottom. The outer diameter of the rubber sealing ring 3 is 180mm, and the inner diameter is 150mm.
The sample 4 is arranged on the conductive cushion block 5, and a rubber sealing ring 3 is sleeved on the stainless steel shielding frame 6 and the edge of the sample 4; the insulating pressing ring 2 and the insulating plastic outer frame 7 are connected and fastened by four fastening bolts 1.
The micro-arc oxidation power supply anode circuit 10 is connected with the conductive bolt 8.
2. The application method of the device for metal micro-arc oxidation unidirectional surface modification comprises the following steps:
step 1: after the whole device is equipped, the sample 4 is placed on the conductive cushion block 5, and then the stainless steel shielding frame 6 and the edge of the sample 4 are sleeved with the rubber sealing ring 3.
Step 2: the bolt through holes on the insulating pressing ring 3 and the threaded holes on the insulating plastic outer frame 7 are opposite to each other, and the fastening bolts 1 are screwed down to enable the sealing rubber ring 3 to be in close contact with the sample 4.
Step 3: according to the thickness of the sample, the conductive cushion blocks 5 with different thicknesses can be replaced to meet the experimental requirements.
Step 4: a micro-arc oxidation power supply anode line 10 is connected at the conductive bolt 8.
Step 5: the device with the sample is placed in an electrolytic tank, so that the surface of the sample is completely placed in the electrolyte, and the proper depth is adjusted, so that the sample is kept parallel to the electrolyte level.
Step 6: according to the preselected parameters, experimental parameters and experimental conditions are set, and a power supply is switched on to perform micro-arc oxidation treatment.
Application examples
Micro-arc oxidation treatment of 2A12 aluminum alloy:
in the example, the sample is a 2A12 circular plate with the diameter phi=155 mm and the thickness h=4 mm, the sample is placed on a conductive cushion block, a rubber sealing ring is sleeved on the stainless steel shielding frame and the edge of the sample, the insulating pressing ring is provided with a bolt through hole and an insulating plastic outer frame threaded hole, and a fastening bolt is screwed down to enable the sealing rubber ring to be in close contact with the sample. The device with the sample is placed in an electrolytic tank, the surface of the sample is completely placed in the electrolyte and is kept parallel to the electrolyte level, and an anode circuit is connected with a micro-arc oxidation anode and is connected with a power supply. In this example, na is used as the electrolyte 2 SiO 3 +KOH solution system at Na concentration 2 SiO 3 :20g/L and KOH: 4g/L. The technological parameters of micro-arc oxidation are as follows: constant current mode, current density 20A/dm 2 Frequency 500Hz, duty cycle 15% and time 30min. The current is stable and the spark is uniform in the micro-arc oxidation process. And taking out the sample after the micro-arc oxidation surface modification is finished, and observing to find that the thickness of a film layer generated on the front surface of the sample contacted with the solution is uniform and compact, and the back surface of the sample is unchanged, so that the micro-arc oxidation unidirectional surface modification is successfully realized.
Claims (6)
1. A device for modifying a metal micro-arc oxidation unidirectional surface, which is characterized in that: the device is formed by assembling n fastening bolts (1), n insulating pressing rings (2), n rubber sealing rings (3), a sample (4), a conductive cushion block (5), a stainless steel shielding frame (6), an insulating plastic outer frame (7), conductive bolts (8), a conductive bolt insulating sheath (9) and an anode circuit (10) connected with a micro-arc oxidation power supply;
after assembly, any one of the n fastening bolts (1) penetrates through the corresponding insulating pressing ring and extends into the insulating outer frame (7), and the stainless steel shielding frame (6) is positioned in a space formed by the conductive cushion block and the insulating plastic outer frame (7) and is in close contact with the conductive cushion block and the insulating plastic outer frame (7);
after assembly, the conductive bolt is coated with an insulating sheath (9); the bottom of the insulating plastic outer frame (7) and the stainless steel shielding frame (6) are penetrated through and embedded into the reserved holes of the conductive cushion block (5); the conductive bolt is also connected with an anode circuit (10) connected with a micro-arc oxidation power supply;
after assembly, cutting the device along the surface A to obtain a section B, wherein the surface A is perpendicular to the bottom surface of the insulating plastic outer frame (7) and passes through 2 insulating pressing rings; projecting along the direction vertical to the section B to obtain a projection diagram, wherein on the projection diagram, a single insulating pressing ring is in a step shape, and a single rubber sealing ring is in an inverted convex shape;
definition: the distance from the bottom of the stainless steel shielding frame (6) to the plane of the top of the insulating plastic outer frame (7) on the projection view is L, and the distance from the bottom of the stainless steel shielding frame (6) to the plane of the top of the stainless steel shielding frame (6) on the projection view is P; defining the height of the conductive cushion block as H; the H is less than P, and P is less than L; defining the height of the protruding part of the single rubber sealing ring as E and the total height of the inverted convex part as F; e+p=l; defining the length of a single insulating pressing ring 'step' as M, the total height as Q, the length of a step surface as R, the first step height S, the second step height as T and the length of the second step as U, and then S+T= Q, R +U=M; the width of the top of the insulating plastic outer frame (7) is defined as V, the width of the table edge of the single rubber sealing ring 'convex' is defined as W, and then U+W=V; defining the length of the "convex" bottom of a single rubber seal as X, then x=r.
2. A device for unidirectional surface modification of metal micro-arc oxidation according to claim 1, wherein: after assembly, the sample (4) is fixed by a conductive cushion block (5) and a rubber sealing ring.
3. A device for unidirectional surface modification of metal micro-arc oxidation according to claim 1, wherein: and n is any integer from 3 to 8.
4. A device for unidirectional surface modification of metal micro-arc oxidation according to claim 1, wherein: and n is 6 or 4.
5. A device for unidirectional surface modification of metal micro-arc oxidation according to claim 1, wherein: on the projection, the width of the top of the single rubber sealing ring 'convex' is defined as Y, and the width of the single rubber sealing ring is consistent with the width of the top of the stainless steel shielding frame (6).
6. A device for unidirectional surface modification of metal micro-arc oxidation according to claim 1, wherein:
the fastening bolt is an M8-specification bolt with the diameter of 8mm, and the conductive bolt is an M10-specification bolt with the diameter of 10 mm;
the outer diameter of the insulating pressing ring is 210mm, the inner diameter of the insulating pressing ring is 150mm, and four uniformly symmetrical bolt through holes with the diameter of 9mm are drilled on the insulating pressing ring;
the outer diameter of the insulating plastic outer frame is 210mm, the inner diameter of the insulating plastic outer frame is 170mm, M8-specification threaded holes are drilled at positions corresponding to the bolt through holes on the insulating pressing ring, and 11-mm bolt through holes are drilled at the center of the bottom of the insulating plastic outer frame;
the outer diameter of the stainless steel shielding frame is 170mm, the inner diameter of the stainless steel shielding frame is 160mm, and a M10 specification threaded hole is drilled in the center of the bottom; the outer diameter of the rubber sealing ring is 180mm, and the inner diameter of the rubber sealing ring is 150mm.
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| CN201710465543.4A CN107447243B (en) | 2017-06-19 | 2017-06-19 | Device for metal micro-arc oxidation unidirectional surface modification |
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| CN201710465543.4A CN107447243B (en) | 2017-06-19 | 2017-06-19 | Device for metal micro-arc oxidation unidirectional surface modification |
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| CN107447243B true CN107447243B (en) | 2023-07-14 |
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| CN107447243A (en) | 2017-12-08 |
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