Thermal inlay metallographic sample suitable for contact type electrode electrolytic polishing instrument

Abstract

The utility model relates to the field of stainless steel microcosmic detection, and particularly discloses a hot inlay metallographic sample suitable for a contact type electrode electrolytic polishing instrument, which is used for preparing an inlay type electrolytic corrosion or electrolytic polishing section sample and consists of a single-sided cohesive copper foil, a polyvinyl chloride insulating tape, a hot inlay material and a stainless steel sample. The manufacturing process is simple, the structure enables the hot inlay material side of the stainless steel sample and the stainless steel sample to be in a conductive state, the single-face cohesive copper foil is connected with an anode of a Lectropol-5 electrolytic polishing instrument, the insulating tape protects the connecting position of the stainless steel sample and the copper foil, and the stainless steel sample is prevented from being damaged. The conductivity and the current density uniformity are greatly improved, and the stability is extremely high.

Description

Technical Field

[0001] This utility model relates to the field of stainless steel microscopic detection, specifically to a hot-mounted metallographic sample suitable for a contact electrode electrolytic polishing instrument. Background Technology

[0002] The Lectropol-5 electropolishing system is a typical contact electrode electropolishing system suitable for electrolytic etching or polishing of steel materials. Currently, metallographic analysis is the primary method for structural analysis, and metallographic samples are often mounted using a hot-mount system. However, conventional chemical etching cannot provide effective metallographic samples for stainless steel, and the calibration rate of samples required for EBSD analysis in SEM is extremely low. Therefore, electrolytic polishing is necessary. The hot-mount material is a phenolic resin polymer, which is non-conductive, and thus cannot be directly electrolytic etched or polished using the Lectropol-5. Currently, the Lectropol-5 can only perform surface etching or polishing of metals without mounting. Metallographic analysis primarily analyzes the cross-sectional microstructure of metal materials. Since most stainless steel is less than 1 mm thick, it cannot be directly fixed on the sample stage; therefore, it is currently difficult to achieve cross-sectional electrolytic etching or polishing of thin materials using this equipment.

[0003] Therefore, based on the above technical problems, a hot-mounted metallographic sample suitable for a contact electrode electrolytic polishing instrument was designed. Utility Model Content

[0004] The purpose of this invention is to provide a hot-mounted metallographic sample suitable for a contact electrode electrolytic polishing instrument, in order to solve the problems of thin steel material cross-sections being unable to be fixed on the sample stage and the back of the mounted sample being non-conductive.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A heat-mounted metallographic sample suitable for a contact electrode electrolytic polishing instrument comprises, from top to bottom, a single-sided adhesive copper foil layer, a heat-mounting material layer, a polyvinyl chloride (PVC) insulating layer, and a stainless steel sample layer. One end of the single-sided adhesive copper foil layer is fixed to the end of the stainless steel sample layer, wrapping the end of the stainless steel sample layer by 1-2 mm. The heat-mounting material layer is adhered to one side of the exposed end of the cross-section of the stainless steel sample layer. The PVC insulating layer wraps the connection between the stainless steel sample layer and the single-sided adhesive copper foil layer.

[0007] Preferably, the overall thickness of the thermally inlaid material layer is 20-25 mm.

[0008] Preferably, the thickness of the single-sided adhesive copper foil layer is 0.05-0.1 mm.

[0009] Preferably, the hot-mounted metallographic sample is fixed by hot-melting and cooling of hot-mounting powder in a mounting machine.

[0010] The beneficial effects of this utility model are as follows:

[0011] 1. The manufacturing process of this utility model is relatively simple. This structure makes the stainless steel sample in a conductive state between the hot-mounted material side and the stainless steel sample. The single-sided adhesive copper foil is connected to the anode of the Lecropol-5 electrolytic polishing instrument. The insulating tape protects the connection between the stainless steel sample and the copper foil, which greatly improves the conductivity and current density uniformity and has extremely high stability.

[0012] 2. The single-sided adhesive copper foil is relatively thin, which completely avoids the problem of poor stability of the sample when placed on the sample stage of the electrolysis device.

[0013] 3. Polyvinyl chloride completely isolates the copper foil immersed in the electrolyte from the electrolyte, with only the stainless steel part in contact with the electrolyte. This avoids interference from galvanic corrosion or other selective corrosion during electrolysis, greatly improving the electrolytic corrosion or polishing efficiency of stainless steel samples.

[0014] 4. This structure can embed multiple samples at once, allowing for electrolytic etching or polishing of multiple samples, thus exhibiting high efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 IPF surface distribution map after EBSD analysis of electropolishing

[0017] In the figure: 1. Polyvinyl chloride insulation layer, 2. Single-sided adhesive copper foil layer, 3. Thermal insert layer, 4. Stainless steel sample layer. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0019] like Figure 1 and 2The illustrated thermally mounted metallographic sample, suitable for a contact electrode electrolytic polishing instrument, comprises, from top to bottom, a single-sided adhesive copper foil layer 2, a thermally mounted material layer 3, a polyvinyl chloride (PVC) insulating layer 1, and a stainless steel sample layer 4. One end of the single-sided adhesive copper foil layer 2 is fixed to the end of the stainless steel sample layer 4, covering the end of the stainless steel sample layer 4 by 1-2 mm. The thermally mounted material layer 3 is adhered to the exposed end of the stainless steel sample layer 4. The PVC insulating layer 1 covers the connection between the stainless steel sample layer 4 and the single-sided adhesive copper foil layer 2. The overall thickness of the thermally mounted material layer 3 is 20-25 mm; the thickness of the single-sided adhesive copper foil layer 2 is 0.05-0.1 mm. The thermally mounted metallographic sample is fixed by hot-melting and cooling the thermally mounted powder in a mounting machine.

[0020] A heat-mounted metallographic sample suitable for contact electrode electropolishing apparatus is used to prepare embedded electrolytic corrosion or electropolishing cross-sectional samples. It consists of a single-sided adhesive copper foil, polyvinyl chloride insulating tape, heat-mounting material, and a stainless steel sample. First, the polished heat-mounted sample is inverted so that the exposed steel cross-section faces upwards. The sample is then encapsulated with a 15*50mm piece of single-sided adhesive copper foil. One end of the copper foil is fixed to the end of the steel material, wrapping it 1-2mm around the end. The foil is pressed firmly to ensure a secure bond and conductivity. The copper foil is then adhered along the heat-mounting material to the side opposite the exposed steel cross-section, making the heat-mounting material and the steel material a conductive whole. The connection between the stainless steel sample and the conductive copper foil was insulated and sealed with polyvinyl chloride insulating tape. The insulating tape was applied to half the length of the side of the hot-mounted material, so that the copper foil in the electrolyte immersion area was completely isolated from the electrolyte. This sample is well-suited for the electrode design structure of the Lectropol-5 electropolishing instrument.

[0021] This invention uses a single-sided adhesive copper foil as a conductive connector, with PVC insulating tape separating the stainless steel and copper foil from the electrolyte, ensuring only the stainless steel contacts the electrolyte. The sample is then heat-mounted and fixed, forming a sandwich structure. This stabilizes the sample and solves the problem of non-conductivity of the heat-mounted material on the back of the sample. Therefore, the sample structure described in this invention has high practical value and convenience for the widely used Lecropol-5 electropolishing instrument.

[0022] The utility model relates to an embedded metallographic sample that meets the requirements of the Lecropol-5 electropolishing instrument. The laboratory has conducted multiple repeatability tests on it, and the test results on the Lecropol-5 electropolishing instrument are good and highly stable, providing researchers with great convenience.

Claims

1. A hot-mounted metallographic sample suitable for a contact electrode electrolytic polishing instrument, characterized in that: From top to bottom, the components include a single-sided adhesive copper foil layer (2), a heat-inserting material layer (3), a polyvinyl chloride insulation layer (1), and a stainless steel sample layer (4). One end of the single-sided adhesive copper foil layer (2) is fixed to the end of the stainless steel sample layer (4) and wraps around the end of the stainless steel sample layer (4) by 1-2 mm. The heat-inserting material layer (3) is pasted to the exposed end of the cross section of the stainless steel sample layer (4). The polyvinyl chloride insulation layer (1) wraps the connection between the stainless steel sample layer (4) and the single-sided adhesive copper foil layer (2).

2. A hot-mounted metallographic sample suitable for a contact electrode electrolytic polishing instrument according to claim 1, characterized in that: The overall thickness of the thermally embedded material layer (3) is 20-25 mm.

3. A hot-mounted metallographic sample suitable for a contact electrode electrolytic polishing instrument according to claim 1, characterized in that: The thickness of the single-sided adhesive copper foil layer (2) is 0.05-0.1 mm.

4. A hot-mounted metallographic sample suitable for a contact electrode electrolytic polishing instrument according to claim 1, characterized in that: The hot-mounted metallographic sample is fixed by hot-melting and cooling of hot-mounting powder in a mounting machine.

Images