A device for improving the corrosion resistance of magnesium alloy

Abstract

A device for improving the corrosion resistance of magnesium alloys, comprising a micro-arc oxidation device, a stirring device, a pH adjusting device, a high-temperature heating device, a nano-spraying device and a cooling device; the cooling device comprises a small box placed inside a large box, and the large box is connected to the cooling box through a hose; the small box is provided with a stirring device, a pH adjusting device, a high-temperature heating device, and a nano-spraying device; the stirring device comprises an impeller connected to a motor transmission; the pH adjusting device comprises a pH sensor and a pH adjusting liquid conduit, and the small box is connected to a pH adjusting liquid container through the pH adjusting liquid conduit; the high-temperature heating device comprises a heater conductor support plate connected to a heater; the nano-spraying device comprises a nano-powder spray head and an adhesive spray; the micro-arc oxidation device comprises a sample conductor fixture and a conductor steel plate. After the micro-arc oxidation treatment, the present invention can carry out the next stage of processing without taking out the sample, and has a high degree of integration.

Description

Technical Field

[0001] The invention relates to the field of magnesium alloy material surface modification experimental equipment, in particular to a device for improving the corrosion resistance of magnesium alloy. Background Art

[0002] With the development of economy and the improvement of people's quality of life, the aging of population is becoming more and more serious. Cardiovascular disease is a common disease that threatens the health of the elderly. The effective method of treating cardiovascular disease is angioplasty, i.e. stent implantation. In addition, the widespread popularity of transportation has caused frequent traffic accidents, resulting in different degrees of human injuries. Some fierce confrontational sports such as football and basketball will also cause different injuries during sports. Most of these injuries are caused by human bones. Bone injuries are generally fixed and treated by internal implants. All these have promoted the research and development of biomedical materials.

[0003] In recent years, magnesium and magnesium alloys can be naturally degraded in the human body without the need for secondary surgery to remove them, which greatly reduces the pain of doctors and patients and medical costs. In addition, the density of magnesium alloys is close to that of human bones, avoiding some advantages such as the "stress shielding" phenomenon, making the preparation of biomedical composite materials based on magnesium and magnesium alloys a research hotspot, and magnesium and magnesium alloys as new biological implant materials also show huge market potential and development prospects. However, magnesium and magnesium alloys have poor corrosion resistance and are very susceptible to corrosion in physiological environments, which limits their medical use as biological implant materials. Surface modification technology is an effective method to improve the corrosion resistance of magnesium and its alloys. How to prepare biomedical composite materials with stronger corrosion resistance using magnesium and magnesium alloys as the matrix through surface modification technology, and studying the corrosion behavior of modified magnesium alloys in simulated body fluids to provide a theoretical basis for clinical application is of great significance.

[0004] At present, the most commonly used surface modification technologies such as micro-arc oxidation and laser shock strengthening can improve the corrosion resistance of magnesium alloys. However, due to the single coating, especially the materials treated with micro-arc oxidation, although the corrosion resistance has been improved, it still cannot reach the expected goal. Because after the micro-arc oxidation treatment, the obtained coating will have many micropores, which will become the nucleation points of corrosion cracking in the future, reducing the corrosion resistance. In addition, most of the micro-arc oxidation devices currently used still need to stir the electrolyte manually, and the high temperature heat cannot be dissipated in time, which is relatively dangerous. Summary of the invention

[0005] In order to overcome the above problems, the present invention provides a highly integrated device for improving the corrosion resistance of magnesium alloy.

[0006] The technical solution adopted by the present invention is: a device for improving the corrosion resistance of magnesium alloy, comprising a micro-arc oxidation device, a stirring device, a pH adjustment device, a high-temperature heating device, a nano-spraying device and a cooling device;

[0007] The cooling device comprises: a large box, a small box, a glass cover of the small box, a heat conducting plate, a cooling box and a hose; the large box and the small box are both hollow inside and open at the top, the small box is placed inside the large box, the bottom of the small box is supported by two plate-like legs between the large box, and a cavity is formed between the small box and the large box; a drainage hole is provided at the bottom of the small box, a filter plate is provided below the drainage hole, and the two ends of the filter plate are respectively connected to the two plate-like legs; a sealing plug is provided in the drainage hole, and a plurality of through holes are provided on the filter plate; the left and right side walls of the large box are respectively provided with a water inlet and a water outlet, and the water inlet and the water outlet are respectively connected to the cooling box through a hose; the left and right side walls of the small box are respectively connected to a plurality of heat conducting plates between the large box, and the heat conducting plates are in the form of a plate-like structure arranged obliquely; a first glass window is embedded in the front side wall of the large box, a second glass window is embedded in the front side wall of the small box at a position corresponding to the first glass window, and the glass cover of the small box is movably arranged on the top of the small box;

[0008] The nano-spraying device comprises: a nano-powder spray head support plate, an adhesive spray head support plate, a nano-powder conduit, an adhesive conduit, a nano-powder spray head cover and an adhesive spray head cover; two nano-powder spray head support plates are arranged in parallel on the rear inner wall of the small box, the rear end of the nano-powder spray head support plate is vertically fixed on the rear inner wall of the small box, and the front end of the nano-powder spray head support plate extends along the horizontal plane to the front side wall of the small box; a nano-powder spray head is vertically arranged between the two nano-powder spray head support plates, and the nano-powder spray head cover is movably embedded in the nano-powder spray head; the nano-powder spray head is connected to the nano-powder container through the nano-powder conduit;

[0009] Two adhesive spray head support plates are arranged in parallel on the front inner wall of the small box, the front end of the adhesive spray head support plate is vertically fixed on the front inner wall of the small box, and the rear end of the adhesive spray head support plate extends along the horizontal plane toward the rear wall of the small box; an adhesive spray head is arranged vertically between the two adhesive spray head support plates, and an adhesive spray head cover is movably embedded in the adhesive spray head; the adhesive spray head is connected to the adhesive container through an adhesive conduit; the rear end of the adhesive spray head support plate is aligned with the front end of the nano powder spray head support plate;

[0010] The micro-arc oxidation device comprises: a power supply, a sample conductor fixture and a conductor steel plate; the conductor steel plate is arranged on the right inner wall of the small box; the sample conductor fixture is located above the nano-powder nozzle support plate, the rear end of the sample conductor fixture is vertically fixed to the rear inner wall of the small box, and the front end of the sample conductor fixture extends along the horizontal plane to the front side wall of the small box and exceeds the front end of the nano-powder nozzle support plate; a sample chuck is arranged at the position where the bottom of the sample conductor fixture exceeds the powder nozzle support plate, and the sample chuck clamps the sample between the adhesive nozzle support plate and the nano-powder nozzle support plate; the power supply is connected to the power connector of the bidirectional switch through a voltage regulating rectifier, the left anode end of the bidirectional switch is connected to the sample conductor fixture through a wire, and the left cathode end of the bidirectional switch is connected to the conductor steel plate through a wire;

[0011] The stirring device comprises a motor, a first bearing support, a second bearing support and a third bearing support; the motor is connected to the gear shaft and the first bevel gear in sequence, the first bearing support supports the rear end of the gear shaft through the bearing, and the second bearing support supports the front end of the gear shaft through the bearing; the axis lines of the motor, the gear shaft and the first bevel gear are located on the same parallel line; the first bevel gear is meshed with the second bevel gear, the second bevel gear is connected to the impeller shaft and the impeller in sequence, the impeller shaft and the impeller are located inside the small box, and the third bearing support supports the impeller shaft through the bearing; the axis lines of the second bevel gear, the impeller shaft and the impeller are located on the same straight line perpendicular to the axis line of the motor; the rear end of the third bearing seat is vertically fixed on the front surface of the second bearing seat, a slot is provided on the rear side wall of the small box, and the bottom end of the second bearing seat is detachably inserted in the slot; the motor is electrically connected to the motor controller;

[0012] The high-temperature heating device comprises: a heater conductor support plate and a heater, wherein the rear inner wall of the small box is provided with a heater conductor support plate, the rear end of the heater conductor support plate is vertically fixed to the rear inner wall of the small box, the front end of the heater conductor support plate extends along a horizontal plane toward the front wall of the small box, and a heater is vertically provided at the bottom of the heater conductor support plate; the right end anode of the bidirectional switch is connected to the heater conductor support plate through a wire, and the right end cathode of the bidirectional switch is connected to the conductor steel plate through a wire;

[0013] The pH adjusting device comprises: a pH sensor and a pH adjusting liquid conduit; the pH sensor is arranged inside a small box; the pH adjusting liquid conduit is vertically arranged inside the small box, and the small box is connected with a pH adjusting liquid container through the pH adjusting liquid conduit.

[0014] Furthermore, a circulating water pump is provided on the pipeline between the water inlet of the large box and the cooling box.

[0015] The beneficial effects of the present invention are as follows: 1) At present, most of the experimental devices at home and abroad require manual stirring of the electrolyte, which has a relatively high risk factor. The present device completely adopts automatic stirring to reduce the risk factor. 2) The high heat dissipation system can quickly dissipate heat, improve preparation efficiency, protect the experimental device, and also greatly reduce the risk factor to the human body. 3) After the micro-arc oxidation treatment, the sample does not need to be taken out, and the next stage of processing can be carried out, with a high degree of integration. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention.

[0017] Figure 2 It is a top view of the present invention.

[0018] Figure 3 yes Figure 2 Sectional view along AA direction.

[0019] Figure 4 It is a front view of the present invention without the stirring device.

[0020] Figure 5 yes Figure 4 Cross-sectional view along direction BB.

[0021] Explanation of reference numerals: 1. motor controller; 2. power supply; 3. voltage regulating rectifier; 4. bidirectional switch; 5. motor; 6. cooling box; 7. first bearing; 8. first bearing support; 9. first bevel gear; 10. second bevel gear; 11. large box; 12. small box; 13. glass cover of small box; 14. hose; 15. glass window of large box; 16. glass window of small box; 17. heater conductor support plate; 18. sample conductor fixture; 19. gear shaft; 20. second shaft Bearing support; 21. pH adjustment liquid conduit; 22. Nano powder conduit; 23. Adhesive nozzle support plate; 24. Adhesive conduit; 25. Conductor steel plate; 26. Impeller shaft; 27. Nano powder nozzle cover; 28. Adhesive nozzle cover; 29. ​​Nano powder nozzle; 30. Third bearing support; 31. Impeller; 32. pH sensor; 33. Heat conduction plate; 34. Filter residue plate; 35. Heater; 36. Sample chuck; 37. Nano powder nozzle support plate; 38. Adhesive nozzle. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with specific embodiments, but the protection scope of the present invention is not limited thereto:

[0023] Referring to the accompanying drawings, a device for improving the corrosion resistance of magnesium alloys includes a micro-arc oxidation device, a stirring device, a pH adjustment device, a high-temperature heating device, a nano-spraying device and a cooling device;

[0024] The cooling device comprises: a large box 11, a small box 12, a glass upper cover 13 of the small box, a heat conducting plate 32, a cooling box 6 and a hose 14; the large box and the small box 12 are both hollow inside and open at the top, the small box 12 is placed inside the large box 11, and two plate-like legs are supported between the bottom of the small box 12 and the large box 11, and a cavity is formed between the small box 12 and the large box; a drainage hole is provided at the bottom of the small box 12, and a filter plate 34 is provided below the drainage hole, and the two ends of the filter plate 34 are respectively connected to the two plate-like legs; a sealing plug is provided in the drainage hole, and a plurality of through holes are provided on the filter plate 34 Hole; the left and right side walls of the large box 11 are respectively provided with a water inlet and a water outlet, the water inlet and the water outlet are respectively connected to the cooling box 6 through a hose 14, and a circulating water pump is provided on the pipeline between the water inlet of the large box 11 and the cooling box 6; the left and right side walls of the small box 12 are respectively connected to the large box 11 with a plurality of heat conducting plates 33, and the heat conducting plates 33 are in a plate-like structure arranged obliquely; the front side wall of the large box 11 is embedded with a first glass window 15, and the front side wall of the small box 12 is embedded with a second glass window 16 at a position corresponding to the first glass window 15, and the glass upper cover 13 of the small box is movably arranged on the top of the small box 12;

[0025] The nano spraying device comprises: a nano powder spray head support plate 37, an adhesive spray head support plate 23, a nano powder conduit 22, an adhesive conduit 24, a nano powder spray head cover 27 and an adhesive spray head cover 28; two nano powder spray head support plates 37 are arranged in parallel on the rear inner wall of the small box 12, the rear end of the nano powder spray head support plate 37 is vertically fixed on the rear inner wall of the small box 12, and the front end of the nano powder spray head support plate 37 extends along the horizontal plane to the front side wall of the small box 12; a nano powder spray head 29 is vertically arranged between the two nano powder spray head support plates 37, and the nano powder spray head cover 27 is movably embedded in the nano powder spray head 29; the nano powder spray head 29 is connected to the nano powder container through the nano powder conduit 22;

[0026] Two adhesive spray head support plates 23 are parallelly arranged on the front inner wall of the small box body 12, the front end of the adhesive spray head support plate 23 is vertically fixed to the front inner wall of the small box body 12, and the rear end of the adhesive spray head support plate 23 extends toward the rear wall of the small box body 12 along the horizontal plane; an adhesive spray head 38 is vertically arranged between the two adhesive spray head support plates 23, and an adhesive spray head cover 28 is movably embedded in the adhesive spray head 38; the adhesive spray head 38 is connected to the adhesive container through the adhesive conduit 24; the rear end of the adhesive spray head support plate 23 is aligned with the front end of the nano powder spray head support plate 37;

[0027] The micro-arc oxidation device comprises: a power supply 2, a sample conductor fixture 18 and a conductor steel plate 25; the conductor steel plate 25 is arranged on the right inner wall of the small box 12; the sample conductor fixture 18 is located above the nano powder nozzle support plate 37, the rear end of the sample conductor fixture 18 is vertically fixed to the rear inner wall of the small box 12, and the front end of the sample conductor fixture 18 extends along the horizontal plane to the front side wall of the small box 12 and exceeds the front end of the nano powder nozzle support plate 37; a sample chuck 36 is arranged at the position where the bottom of the sample conductor fixture 18 exceeds the powder nozzle support plate 37, and the sample chuck 36 clamps the sample between the adhesive nozzle support plate 23 and the nano powder nozzle support plate 37; an electrolyte is placed in the small box 12 so that the entire sample is below the liquid level;

[0028] The power source 2 is connected to the power connector of the bidirectional switch 4 via the voltage regulating rectifier 3, the left anode terminal of the bidirectional switch 4 is connected to the sample conductor fixture 18 via a wire, and the left cathode terminal of the bidirectional switch 4 is connected to the conductor steel plate 25 via a wire;

[0029] The stirring device comprises a motor 5, a first bearing support 8, a second bearing support 20 and a third bearing support 30; the motor 4 is connected to a gear shaft 19 and a first bevel gear 9 in sequence, the first bearing support 8 supports the rear end of the gear shaft 19 through a first bearing 7, and the second bearing support 20 supports the front end of the gear shaft 19 through a bearing; the axis lines of the motor 5, the gear shaft 19 and the first bevel gear 9 are located on the same parallel line; the first bevel gear 9 is meshed with the second bevel gear 10, and the second bevel gear 10 is connected in sequence The impeller shaft 26 and the impeller 31 are connected, and the impeller shaft 26 and the impeller 31 are located inside the small box body. The third bearing support 30 supports the impeller shaft 26 through the bearing; the axis lines of the second bevel gear 10, the impeller shaft 26 and the impeller 31 are located on the same straight line perpendicular to the axis line of the motor 5; the rear end of the third bearing seat 30 is vertically fixed on the front surface of the second bearing seat 20, and a slot is provided on the rear side wall of the small box body 12, and the bottom end of the second bearing seat 20 is detachably inserted in the slot; the motor 5 is electrically connected to the motor controller 1;

[0030] The high temperature heating device comprises: a heater conductor support plate 17 and a heater 35. The rear inner wall of the small box 12 is provided with a heater conductor support plate. The rear end of the heater conductor support plate 17 is vertically fixed to the rear inner wall of the small box 12. The front end of the heater conductor support plate 17 extends along a horizontal plane toward the front wall of the small box 12. The bottom of the heater conductor support plate 17 is vertically provided with a heater 35. The right end anode of the two-way switch 4 is connected to the heater conductor support plate 17 through a wire, and the right end cathode of the two-way switch 4 is connected to the conductor steel plate 25 through a wire.

[0031] The pH adjusting device includes: a pH sensor 32 and a pH adjusting liquid conduit 21; the pH sensor 32 is arranged inside the small box 12, and the pH sensor 32 is located below the liquid level of the electrolyte; the pH adjusting liquid conduit 21 is vertically arranged in the small box, and the small box 12 is connected to the pH adjusting liquid container through the pH adjusting liquid conduit 21.

[0032] The following is a brief description of the operation process of a device for improving the corrosion resistance of magnesium alloy in this example:

[0033] a. When the experiment is to be carried out, install the test piece in the sample conductor fixture, open the glass cover of the small box, and introduce the micro-arc oxidation electrolyte until the liquid level completely covers the sample; then fill the coolant into the cavity formed by the large box and the small box.

[0034] b. Turn on the power and turn the two-way switch to the left to start the micro-arc oxidation device. At the same time, start the stirring device and cooling device to perform micro-arc oxidation surface treatment.

[0035] c. After a period of time, observe the surface treatment of the sample through the glass windows of the large box and the small box. After the treatment is completed, reset the two-way switch and wait for a while. Then turn off the stirring device and cooling device, drain the coolant, and then pull out the sealing plug at the bottom of the small box to drain the electrolyte.

[0036] d. Remove the stirring device, close the glass cover of the small box, turn the two-way switch to the right, and after heating for a period of time, spray the adhesive and nano powder. After completion, reset the two-way switch, fill the cavity formed by the large box and the small box with coolant, turn on the cooling device, and take out the sample after the small box cools to room temperature.

[0037] The contents described in the embodiments of this specification are merely an enumeration of the implementation forms of the inventive concept. The protection scope of the present invention should not be regarded as limited to the specific forms described in the embodiments. The protection scope of the present invention also extends to equivalent technical means that can be conceived by those skilled in the art based on the inventive concept.

Claims

1. A method for operating a device for improving the corrosion resistance of a magnesium alloy, characterized in that: A device for improving the corrosion resistance of magnesium alloy includes a micro-arc oxidation device, a stirring device, a pH adjustment device, a high-temperature heating device, a nano-spraying device and a cooling device; The cooling device comprises: a large box, a small box, a glass cover of the small box, a heat conducting plate, a cooling box and a hose; the large box and the small box are both hollow inside and open at the top, the small box is placed inside the large box, the bottom of the small box is supported by two plate-like legs between the large box, and a cavity is formed between the small box and the large box; a drainage hole is provided at the bottom of the small box, a filter plate is provided below the drainage hole, and the two ends of the filter plate are respectively connected to the two plate-like legs; a sealing plug is provided in the drainage hole, and a plurality of through holes are provided on the filter plate; the left and right side walls of the large box are respectively provided with a water inlet and a water outlet, and the water inlet and the water outlet are respectively connected to the cooling box through a hose; the left and right side walls of the small box are respectively connected to a plurality of heat conducting plates between the large box, and the heat conducting plates are in the form of a plate-like structure arranged obliquely; a first glass window is embedded in the front side wall of the large box, a second glass window is embedded in the front side wall of the small box at a position corresponding to the first glass window, and the glass cover of the small box is movably arranged on the top of the small box; The nano-spraying device comprises: a nano-powder spray head support plate, an adhesive spray head support plate, a nano-powder conduit, an adhesive conduit, a nano-powder spray head cover and an adhesive spray head cover; two nano-powder spray head support plates are arranged in parallel on the rear inner wall of the small box, the rear end of the nano-powder spray head support plate is vertically fixed on the rear inner wall of the small box, and the front end of the nano-powder spray head support plate extends along the horizontal plane to the front side wall of the small box; a nano-powder spray head is vertically arranged between the two nano-powder spray head support plates, and the nano-powder spray head cover is movably embedded in the nano-powder spray head; the nano-powder spray head is connected to the nano-powder container through the nano-powder conduit; Two adhesive spray head support plates are arranged in parallel on the front inner wall of the small box, the front end of the adhesive spray head support plate is vertically fixed on the front inner wall of the small box, and the rear end of the adhesive spray head support plate extends along the horizontal plane toward the rear wall of the small box; an adhesive spray head is arranged vertically between the two adhesive spray head support plates, and an adhesive spray head cover is movably embedded in the adhesive spray head; the adhesive spray head is connected to the adhesive container through an adhesive conduit; the rear end of the adhesive spray head support plate is aligned with the front end of the nano powder spray head support plate; The micro-arc oxidation device comprises: a power supply, a sample conductor fixture and a conductor steel plate; the conductor steel plate is arranged on the right inner wall of the small box; the sample conductor fixture is located above the nano-powder nozzle support plate, the rear end of the sample conductor fixture is vertically fixed to the rear inner wall of the small box, and the front end of the sample conductor fixture extends along the horizontal plane to the front side wall of the small box and exceeds the front end of the nano-powder nozzle support plate; a sample chuck is arranged at the position where the bottom of the sample conductor fixture exceeds the powder nozzle support plate, and the sample chuck clamps the sample between the adhesive nozzle support plate and the nano-powder nozzle support plate; the power supply is connected to the power connector of the bidirectional switch through a voltage regulating rectifier, the left anode end of the bidirectional switch is connected to the sample conductor fixture through a wire, and the left cathode end of the bidirectional switch is connected to the conductor steel plate through a wire; The stirring device comprises a motor, a first bearing support, a second bearing support and a third bearing support; the motor is connected to the gear shaft and the first bevel gear in sequence, the first bearing support supports the rear end of the gear shaft through the bearing, and the second bearing support supports the front end of the gear shaft through the bearing; the axis lines of the motor, the gear shaft and the first bevel gear are located on the same parallel line; the first bevel gear is meshed with the second bevel gear, the second bevel gear is connected to the impeller shaft and the impeller in sequence, the impeller shaft and the impeller are located inside the small box, and the third bearing support supports the impeller shaft through the bearing; the axis lines of the second bevel gear, the impeller shaft and the impeller are located on the same straight line perpendicular to the axis line of the motor; the rear end of the third bearing seat is vertically fixed on the front surface of the second bearing seat, a slot is provided on the rear side wall of the small box, and the bottom end of the second bearing seat is detachably inserted in the slot; the motor is electrically connected to the motor controller; The high-temperature heating device comprises: a heater conductor support plate and a heater, wherein the rear inner wall of the small box is provided with a heater conductor support plate, the rear end of the heater conductor support plate is vertically fixed to the rear inner wall of the small box, the front end of the heater conductor support plate extends along a horizontal plane toward the front wall of the small box, and a heater is vertically provided at the bottom of the heater conductor support plate; the right end anode of the bidirectional switch is connected to the heater conductor support plate through a wire, and the right end cathode of the bidirectional switch is connected to the conductor steel plate through a wire; The pH adjusting device comprises: a pH sensor and a pH adjusting liquid conduit; the pH sensor is arranged inside the small box; the pH adjusting liquid conduit is vertically arranged inside the small box, and the small box is connected to the pH adjusting liquid container through the pH adjusting liquid conduit; The specific steps include: a. When the experiment is to be carried out, install the test piece in the sample conductor fixture, open the glass cover of the small box, and introduce the micro-arc oxidation electrolyte until the liquid level completely covers the sample; then fill the cooling liquid into the cavity formed by the large box and the small box; b. Turn on the power and turn the two-way switch to the left to start the micro-arc oxidation device. At the same time, start the stirring device and cooling device to perform micro-arc oxidation surface treatment; c. After a period of time, observe the surface treatment of the sample through the glass windows of the large box and the small box. After the treatment is completed, reset the two-way switch and wait for a while; then turn off the stirring device and the cooling device, drain the coolant, and then pull out the sealing plug at the bottom of the small box to drain the electrolyte; d. Remove the stirring device, close the glass cover of the small box, turn the two-way switch to the right, and after heating for a period of time, spray the adhesive and nano powder. After completion, reset the two-way switch, fill the cavity formed by the large box and the small box with coolant, turn on the cooling device, and take out the sample after the small box cools to room temperature.

2. The method for operating the device for improving the corrosion resistance of magnesium alloy according to claim 1, characterized in that: A circulating water pump is arranged on the pipeline between the water inlet of the large box and the cooling box.

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