Device for electrolytic polishing of metal samples

Abstract

The present invention relates to the field of material testing technology, and in particular to a device suitable for electrolytic polishing of metal samples, comprising an electrolytic cell for containing electrolytic polishing liquid, a first bracket and a second bracket respectively arranged at two ends of the electrolytic cell, a copper sheet hung under the first bracket as a cathode, and a sample assembly hung under the second bracket, wherein the sample assembly comprises a clamp, a sample matched and embedded in one side of the clamp and used as an anode, and a copper screw screwed into the upper end of the clamp and in contact with the upper end surface of the sample, the upper end of the copper screw is connected to the lifting mechanism, the copper sheet and the copper screw are respectively connected to the positive and negative electrodes of a direct current power supply through wires, and the preparation of polished samples using the device of the present invention is not only convenient and simple to operate, but also the polishing process will not damage the device and will not cause contamination of the electrolytic polishing liquid, and the obtained polished samples have good stability and uniform polishing degree.

Description

Technical Field

[0001] The invention relates to the technical field of material testing, and in particular to a device suitable for electrolytic polishing of metal samples. Background Art

[0002] Since the study of the physical properties of metal materials requires samples with no mechanical polishing layer and no stress on the material surface, electrolytic polishing has become a common method to remove the polishing layer of such samples. The existing electrolytic polishing method generally uses a metal clamp to clamp the sample, then connects the power supply and places it in a suitable acid solution for polishing. However, this method has the following problems: (1) After the power is turned on, the clamp will quickly dissolve in the acid solution, and some metal ions will enter the solution, causing solution contamination, affecting the polishing quality, and causing test failure; (2) After being used several times, the clamp will be unable to clamp the sample due to corrosion, resulting in the need to frequently replace the clamp; (3) The area where the clamp is used to clamp the sample undergoes different types of chemical reactions during the electrolytic polishing process or cannot be polished due to obstruction, resulting in the sample area not meeting the test requirements; (4) During the polishing process, if the positive and negative electrodes are not fixed, the distance between the two electrodes will be different when polishing different samples, the current size is poorly stable, and the polishing degree of different samples is different, which is not convenient for comparison; (5) As the acid in the electrolyte reacts, the concentration continues to decrease, resulting in different polishing degrees of the same batch of samples under the same external conditions, that is, the electrolysis degree of the sample polished later is lower than that of the sample polished earlier, and further resulting in unreliable subsequent test results. Based on the above five problems, the current device is not conducive to electrolytic polishing experiments. Summary of the invention

[0003] Based on the defects of the prior art, the present invention provides a device suitable for electrolytic polishing of metal samples.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a device suitable for electrolytic polishing of metal samples, comprising an electrolytic cell for containing electrolytic polishing liquid, a first bracket and a second bracket respectively arranged at both ends of the electrolytic cell, a copper sheet hung under the first bracket as a cathode, and a sample assembly hung under the second bracket, the sample assembly comprising a clamp, a sample embedded in one side of the clamp to serve as an anode, and a copper screw screwed into the upper end of the clamp and in contact with the upper end surface of the sample, the upper end of the copper screw is connected to the lifting mechanism, and the copper sheet and the copper screw are respectively connected to the positive and negative electrodes of a DC power supply through wires.

[0005] Furthermore, one side of the sample facing the copper sheet is exposed from the fixture, and the other sides of the sample are sealed.

[0006] Furthermore, an opening is provided on a side of the fixture facing the copper sheet, the sample is cooperatively embedded in the opening, and the sample and the inner wall of the opening are sealed by filling with silicone.

[0007] Furthermore, the copper screw is threadedly connected to the clamp.

[0008] Furthermore, the lifting mechanism includes a driving motor, a lead screw coaxially connected to the output shaft of the driving motor, and a lead screw nut matchedly sleeved on the lead screw, and the upper end of the copper screw is fixedly connected to the lead screw nut.

[0009] Furthermore, the driving motor is mounted on the second bracket.

[0010] Furthermore, the electrolytic cell is provided with a slide rail, and the first bracket and the second bracket can be slidably arranged on the electrolytic cell along the slide rail.

[0011] Furthermore, the fixture and the electrolytic cell are both made of polytetrafluoroethylene.

[0012] After adopting the above technical scheme, the present invention has the following advantages compared with the prior art:

[0013] (1) The device of the present invention can be used to conveniently install and remove samples. After polishing, the sample can be conveniently removed from the fixture by simply picking out the silica gel, and the removal process will not damage the polished surface.

[0014] (2) The device of the present invention can completely immerse the sample in the electrolytic polishing solution, which will not corrode the fixture and the copper screw, and can obtain a uniform and complete polishing surface. At the same time, it will not cause other metal ions in the metal clamp to enter the electrolytic polishing solution and cause contamination. The polished sample obtained has good stability and a uniform polishing degree. In addition, the distance between the two electrodes can be adjusted according to the corrosion resistance of the sample to obtain the best polishing surface. If the sample has good corrosion resistance, the cathode can be moved forward to increase the current. If the sample has poor corrosion resistance, the cathode can be moved backward to reduce the current.

[0015] (3) The polished samples obtained by the device of the present invention can be used for the study of the physical properties of metal materials, especially when the sample surface needs to be stress-free during the research process, such as for testing the texture and crystal orientation of metal materials or other samples that require the removal of the polishing layer on the sample surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attached Figure 1 It is a schematic diagram of the structure of the device of the present invention;

[0017] Attached Figure 2 It is a structural schematic diagram of the lifting mechanism connected to the clamp in the present invention.

[0018] in,

[0019] 1. Electrolytic cell; 2. First bracket; 3. Second bracket; 4. Copper sheet; 5. Copper wire; 6. Clamp; 601. Opening; 7. Copper screw; 8. DC power supply; 9. Wire; 10. Silicone; 11. Drive motor; 12. Screw; 13. Screw nut; 14. Sample. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] like Figure 1 and Figure 2 As shown, a device suitable for electrolytic polishing of a metal sample 13 includes an electrolytic cell 1 for containing an electrolyte, a first bracket 2 and a second bracket 3 respectively arranged at both ends of the electrolytic cell 1, a copper sheet 4 hung under the first bracket 2 as a cathode, and a sample 13 assembly hung under the second bracket 3, the sample 13 assembly includes a clamp 6, a sample 13 embedded in one side of the clamp 6 to serve as an anode, and a copper screw 7 screwed into the upper end of the clamp 6 and in contact with the upper end surface of the sample 13, the upper end of the copper screw 7 is connected to a lifting mechanism, and the copper sheet 4 and the copper screw 7 are respectively connected to the positive and negative electrodes of a DC power supply 8 through a wire 9.

[0022] The side of the sample 13 facing the copper sheet 4 is a polished surface, which is exposed to the fixture 6, and the other sides of the sample 13 are sealed. In this embodiment, an opening 601 is provided on the side of the fixture 6 facing the copper sheet 4, and the sample 13 is embedded in the opening 601, and the sample 13 and the inner wall of the opening 601 are sealed by the filled silicone 10. In this way, the sample 13 can be easily installed and removed, and it can be ensured that only one side of the sample 13 is polished. After polishing, the sample 13 can be conveniently removed from the fixture 6 by simply picking out the silicone 10, and the removal process will not damage the polished surface.

[0023] In this embodiment, the copper sheet 4 is hung under the first bracket 2 through the copper wire 5, and the wire 9 connects the copper wire 5 and the DC power supply 8. In order to facilitate the test of the current flowing through the wire 9, a current detection device is installed on the wire 9.

[0024] In order to ensure good connectivity between the copper screw 7 and the clamp 6, the copper screw 7 and the clamp 6 are threadedly connected.

[0025] The lifting mechanism in this embodiment includes a driving motor 11, a lead screw 12 coaxially connected to the output shaft of the driving motor 11, and a lead screw nut 13 sleeved on the lead screw 12. The driving motor 11 is mounted on the second bracket 3. The upper end of the copper screw 7 is fixedly connected to the lead screw nut 13. The lifting and lowering operation of the clamp 6 can be realized by the lifting mechanism, that is, the lifting and lowering operation of the sample 13 can be realized.

[0026] A slide rail is provided on the electrolytic cell 1, and the first bracket 2 and the second bracket 3 can be slidably arranged on the electrolytic cell 1 along the slide rail, so that the distance between the two electrodes can be adjusted according to the corrosion resistance of the sample 13, thereby obtaining the best polishing surface. If the corrosion resistance of the sample 13 is good, the cathode can be moved forward to increase the current. If the corrosion resistance of the sample 13 is poor, the cathode can be moved backward to reduce the current.

[0027] The fixture 6 and the electrolytic cell 1 in this embodiment are both made of polytetrafluoroethylene.

[0028] The device of the present invention can completely immerse the sample 13 in the electrolytic polishing solution, which will not corrode the clamp 6 and the copper screw 7, and can obtain a uniform and complete polishing surface. At the same time, it will not cause other metal ions in the metal clamp to enter the electrolytic polishing solution and cause contamination. The obtained sample 13 has good stability and a uniform polishing degree.

[0029] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A device suitable for electrolytic polishing of metal samples, characterized in that: The invention comprises an electrolytic cell for containing electrolytic polishing liquid, a first bracket and a second bracket respectively arranged at two ends of the electrolytic cell, a copper sheet hung under the first bracket as a cathode, and a sample assembly hung under the second bracket, wherein the sample assembly comprises a clamp, a sample matched and embedded in one side of the clamp and used as an anode, and a copper screw screwed into the upper end of the clamp and in contact with the upper end surface of the sample, the upper end of the copper screw is connected to a lifting mechanism, the copper sheet and the copper screw are respectively connected to the positive and negative electrodes of a DC power supply through wires; one side of the sample facing the copper sheet is exposed to the clamp, and the other sides of the sample are sealed; an opening is provided on one side of the clamp facing the copper sheet, the sample is matched and embedded in the opening, and the sample and the inner wall of the opening are sealed by filling silicone.

2. A device suitable for electrolytic polishing of metal samples according to claim 1, characterized in that: The copper screw is threadedly connected to the clamp.

3. The device for electrolytic polishing of metal samples according to claim 1, characterized in that: The lifting mechanism comprises a driving motor, a lead screw coaxially connected to the output shaft of the driving motor, and a lead screw nut matched and sleeved on the lead screw, and the upper end of the copper screw is fixedly connected to the lead screw nut.

4. The device for electrolytic polishing of metal samples according to claim 3, characterized in that: The driving motor is mounted on the second bracket.

5. The device for electrolytic polishing of metal samples according to claim 1, characterized in that: The electrolytic cell is provided with a slide rail, and the first bracket and the second bracket are slidably arranged on the electrolytic cell along the slide rail.

6. The device for electrolytic polishing of metal samples according to claim 1, characterized in that: The clamp and the electrolytic cell are both made of polytetrafluoroethylene.

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