CN113514311A - Display method of pure tin metallographic phase - Google Patents
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- CN113514311A CN113514311A CN202110611432.6A CN202110611432A CN113514311A CN 113514311 A CN113514311 A CN 113514311A CN 202110611432 A CN202110611432 A CN 202110611432A CN 113514311 A CN113514311 A CN 113514311A
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- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000005498 polishing Methods 0.000 claims abstract description 112
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 95
- 239000007788 liquid Substances 0.000 claims abstract description 18
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 49
- 244000137852 Petrea volubilis Species 0.000 claims description 15
- 235000019441 ethanol Nutrition 0.000 claims description 14
- 238000005406 washing Methods 0.000 claims description 12
- 238000005520 cutting process Methods 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 claims 1
- 239000013078 crystal Substances 0.000 abstract description 5
- 238000000227 grinding Methods 0.000 description 29
- 238000005868 electrolysis reaction Methods 0.000 description 11
- 239000008399 tap water Substances 0.000 description 11
- 235000020679 tap water Nutrition 0.000 description 11
- 239000000428 dust Substances 0.000 description 7
- 238000005070 sampling Methods 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 229910001128 Sn alloy Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000007517 polishing process Methods 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- JVPLOXQKFGYFMN-UHFFFAOYSA-N gold tin Chemical compound [Sn].[Au] JVPLOXQKFGYFMN-UHFFFAOYSA-N 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000005088 metallography Methods 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910001281 superconducting alloy Inorganic materials 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/32—Polishing; Etching
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a method for displaying a pure tin metallographic phase, which comprises the following steps: providing a pure tin sample to be detected; sequentially polishing the surface of the pure tin sample to be tested by adopting first water-based abrasive paper, second water-based abrasive paper and third water-based abrasive paper to form a first polishing surface; carrying out first electrolytic polishing on the first polished surface by using first electrolytic polishing liquid to form a second polished surface; and carrying out second electrolytic polishing on the second polished surface by using second electrolytic polishing liquid to form a pure tin metallographic phase display surface. The method for displaying the pure tin metallographic phase combines the first electrolytic polishing and the second electrolytic polishing, is simple to operate, consumes short time, can simply and efficiently corrode a tin crystal boundary, and has a clear and attractive metallographic structure.
Description
Technical Field
The invention relates to a machining method, in particular to a method for displaying a pure tin metallographic phase.
Background
The tin target has strong heat absorption capacity, high strength, stable mechanical performance and excellent conductivity, is widely applied to tin plating and diffusion doping processes, semiconductors, manufacturing superconducting alloys and the like in the microelectronic industry, and serves as electronic, photoelectric, military, decorative plating, functional films and the like.
Pure tin has low hardness and recrystallization temperature, and is easy to form a deformation layer, so that tin and tin alloy are easy to cause deformation layers, pseudo structures, twin crystals and the like which interfere metallographic judgment in the sample preparation process. In metallographic phase preparation, silicon carbide in sandpaper is easily embedded during grinding and a polishing agent is easily embedded during polishing, making it difficult to polish samples into mirror images. When metallographic observation is carried out, good effects cannot be obtained because the polishing quality and the chemical corrosion process are difficult to control.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a method for displaying a pure tin metallographic phase.
In order to achieve the purpose, the invention adopts the technical scheme that: a method for displaying a pure tin metallographic phase comprises the following steps:
providing a pure tin sample to be detected;
sequentially polishing the surface of the pure tin sample to be detected by adopting first water-based abrasive paper, second water-based abrasive paper and third water-based abrasive paper to form a first polished surface, wherein the grain sizes of the first water-based abrasive paper, the second water-based abrasive paper and the third water-based abrasive paper are sequentially increased;
carrying out first electrolytic polishing on the first polished surface by using first electrolytic polishing liquid to form a second polished surface, wherein the first electrolytic polishing liquid is HClO4And ethanol, wherein the direct current electrolytic voltage of the first electrolytic polishing is 25-30V, and the time of the first electrolytic polishing is 50-70 s;
carrying out second electrolytic polishing on the second polished surface by using second electrolytic polishing liquid to form a display surface of a pure tin metallographic phase, wherein the second electrolytic polishing liquid is HClO4And ethanol, wherein the direct current electrolytic voltage of the second electrolytic polishing is 6-10V, and the time of the second electrolytic polishing is 15-25 s.
At present, a metallographic sample of tin is obtained mainly by mechanical grinding and mechanical polishing, and a deformation layer is easily formed due to low hardness and recrystallization temperature of pure tin, so that the tin and the tin alloy are easy to cause a deformation layer, a pseudo structure, a twin crystal and the like which interfere with metallographic judgment in the sample preparation process. In metallographic phase preparation, silicon carbide in sandpaper is easily embedded during grinding and a polishing agent is easily embedded during polishing, resulting in difficulty in polishing the sample into a mirror image and a considerable time consumption in the polishing stage. The method can obtain the non-deformation tin-gold phase sample in a short time by adopting electrolytic polishing, thereby greatly improving the metallographic preparation efficiency.
Chemical corrosion is generally adopted in the current tin metallographic corrosion stage, the obtained metallographic structure is not clear enough, the corrosion process is difficult to control, and the experimental reproducibility is low. The mechanical polishing most commonly adopted in the pure tin polishing stage is optimized into first electrolytic polishing; the chemical corrosion adopted by the pure tin metallographic appearance mode is optimized to be the second electrolytic polishing. The method for displaying the pure tin metallographic phase disclosed by the invention combines the first electrolytic polishing and the second electrolytic polishing, can realize the polishing of a display surface and the display of the metallographic phase under the electrolysis condition, is simple to operate, consumes short time, can simply and efficiently corrode a tin crystal boundary, and has a clear and attractive metallographic structure.
In a preferred embodiment of the method for displaying a pure tin phase according to the present invention, the first, second, and third aqueous sandpaper are: 600# water sand paper, 1200# water sand paper and 2500# water sand paper.
As a preferred embodiment of the method for displaying the pure tin metallographic phase, the rotating speed of the first water-based sand paper grinding, the rotating speed of the second water-based sand paper grinding and the rotating speed of the third water-based sand paper grinding are all 350-450 r/min, and the grinding time is 1-3 min.
As a preferred embodiment of the method for displaying the pure tin metallographic phase, the method further comprises the step of cleaning the surface of the target to be detected after the first water-based sand paper is used for polishing, the second water-based sand paper is used for polishing and the third water-based sand paper is used for polishing.
As a preferable embodiment of the method for displaying a pure tin phase of the present invention, the first electrolytic polishing liquid and the second electrolytic polishing liquid are 70 wt.% of HClO4Mixed with absolute ethanol, 70 wt.% of HClO4The volume ratio of the alcohol to absolute ethyl alcohol is as follows: 70 wt.% HClO4The ratio of absolute ethyl alcohol is 1: 9. The inventors found that under the electrolysis of the first electrolytic polishing solution and the second electrolytic polishing solution, the polishing and display of the metallographic phase can be better realized by controlling the electrolysis conditions.
As a preferable embodiment of the method for displaying a pure tin metal phase of the present invention, the anodes of the first electrolytic polishing and the second electrolytic polishing are pure tin samples, and the cathodes are stainless steel.
As a preferable embodiment of the method for displaying a pure tin phase according to the present invention, the method further includes, after the first electrolytic polishing is completed: and washing the second polished surface for more than 15 seconds by adopting pure water, washing by using absolute ethyl alcohol, and finally drying.
As a preferable embodiment of the method for displaying a pure tin phase according to the present invention, the method further includes, after the second electrolytic polishing is completed: and washing the display surface of the pure tin metallographic phase for more than 15 seconds by adopting pure water, washing by using absolute ethyl alcohol, and finally drying.
As a preferred embodiment of the method for displaying the pure tin metallographic phase, the method further comprises the steps of marking the pure tin sample to be detected before the surface of the pure tin sample to be detected is polished by sequentially using the first water-based sand paper, the second water-based sand paper and the third water-based sand paper, and then performing water cutting.
The invention has the beneficial effects that: the invention provides a method for displaying a pure tin metallographic phase. The method for displaying the pure tin metallographic phase combines the first electrolytic polishing and the second electrolytic polishing, is simple to operate, consumes short time, can simply and efficiently corrode a tin crystal boundary, and has a clear and attractive metallographic structure.
Drawings
FIG. 1 is a photomicrograph of the show surface of a pure tin phase as described in example 1, at 20X magnification;
FIG. 2 is a photomicrograph of the show surface of a pure tin phase as described in example 2, at 20 magnification;
fig. 3 is a photomicrograph of the display surface of a pure tin phase described in the comparative example, at a magnification of 20X.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples.
Example 1
The method for displaying the pure tin phase comprises the following steps:
providing a pure tin sample to be tested: sampling by adopting water cutting equipment, and scribing a sample before sampling to ensure that the surface of the water cutting sample is smooth, and the cross section of the sample is 15 x 15 mm;
it is right the surface of the pure tin sample that awaits measuring adopts first water-based abrasive paper, second water-based abrasive paper and third water-based abrasive paper to polish in proper order, forms first polished surface, first water-based abrasive paper, second water-based abrasive paper and third water-based abrasive paper are respectively: 600# water-based sandpaper, 1200# water-based sandpaper and 2500# water-based sandpaper; the grinding speed of the first water-based abrasive paper is 400r/min, the grinding time is 2min, and after grinding is finished, the grinding scraps are washed clean by tap water to prevent the first water-based abrasive paper from being brought into the next grinding process; the grinding speed of the second water-based abrasive paper is 400r/min, the second water-based abrasive paper is ground until the surface is smooth and no previous scratch exists, the new scratch is shallow and the orientation is consistent, the grinding time is 2min, and after the grinding is finished, the abrasive dust is washed clean by tap water to prevent the abrasive dust from being brought into the next grinding process; the polishing rotation speed of the third water-based abrasive paper is 400r/min, the third water-based abrasive paper is polished until the surface is smooth and no previous scratch exists, the new scratch is shallow and the orientation is consistent, the polishing time is 2min, after polishing is finished, the third water-based abrasive paper is washed by tap water, washed by absolute ethyl alcohol and dried by cold air;
carrying out first electrolytic polishing on the first polished surface by using first electrolytic polishing liquid to form a second polished surface: a pure tin sample is taken as an anode, and a stainless steel plate is taken as a cathode; the first electrolytic polishing solution is 70 wt.% HClO4The volume ratio of the alcohol to absolute ethyl alcohol is as follows: 70 wt.% HClO4Absolute ethyl alcohol is 1:9, the direct current electrolytic voltage of the first electrolytic polishing is 25V, and the time of the first electrolytic polishing is 70 s; the electrolysis temperature is lower than 40 ℃, the sample to be electrolyzed is shaken during the electrolysis, after the first electrolytic polishing is finished, the sample is washed by pure water for more than 15s, then washed by absolute ethyl alcohol, and dried by a blower;
carrying out second electrolytic polishing on the second polished surface by using second electrolytic polishing liquid to form a pure tin metallographic phase display surface; the second electrolytic polishing solution is 70 wt.% of HClO4The volume ratio of the alcohol to absolute ethyl alcohol is as follows: 70 wt.% HClO4Absolute ethyl alcohol is 1:9, the direct current electrolytic voltage of the second electrolytic polishing is 6V, and the time of the second electrolytic polishing is 25 s; and (3) the electrolysis temperature is lower than 40 ℃, the sample to be electrolyzed is shaken during the electrolysis, and after the first electrolytic polishing is finished, the sample is washed by pure water for more than 15s, then washed by absolute ethyl alcohol and dried by a blower with cold air.
Example 2
The method for displaying the pure tin phase comprises the following steps:
providing a pure tin sample to be tested: sampling by adopting water cutting equipment, and scribing a sample before sampling to ensure that the surface of the water cutting sample is smooth, and the cross section of the sample is 15 x 15 mm;
it is right the surface of the pure tin sample that awaits measuring adopts first water-based abrasive paper, second water-based abrasive paper and third water-based abrasive paper to polish in proper order, forms first polished surface, first water-based abrasive paper, second water-based abrasive paper and third water-based abrasive paper are respectively: 600# water-based sandpaper, 1200# water-based sandpaper and 2500# water-based sandpaper; the polishing rotation speed of the first water-based abrasive paper is 450r/min, the polishing time is 2min, and after polishing is finished, the first water-based abrasive paper is washed clean by tap water to prevent the first water-based abrasive paper from being brought into the next polishing process; the polishing speed of the second water-based abrasive paper is 450r/min, the second water-based abrasive paper is polished until the surface is smooth and no previous scratch exists, the new scratch is shallow and the orientation is consistent, the polishing time is 2min, and after polishing is finished, the abrasive dust is washed clean by tap water to prevent the second water-based abrasive paper from being brought into the next polishing process; the polishing speed of the third water-based abrasive paper is 450r/min, the third water-based abrasive paper is polished until the surface is flat and no previous scratch exists, the new scratch is shallow and the orientation is consistent, the polishing time is 2min, after polishing is finished, the third water-based abrasive paper is washed clean by tap water, washed by absolute ethyl alcohol and dried by cold air;
carrying out first electrolytic polishing on the first polished surface by using first electrolytic polishing liquid to form a second polished surface: a pure tin sample is taken as an anode, and a stainless steel plate is taken as a cathode; the first electrolytic polishing solutionIs 70 wt.% HClO4The volume ratio of the alcohol to absolute ethyl alcohol is as follows: 70 wt.% HClO4Absolute ethyl alcohol is 1:9, the direct current electrolytic voltage of the first electrolytic polishing is 30V, and the time of the first electrolytic polishing is 50 s; the electrolysis temperature is lower than 40 ℃, the sample to be electrolyzed is shaken during the electrolysis, after the first electrolytic polishing is finished, the sample is washed by pure water for more than 15s, then washed by absolute ethyl alcohol, and dried by a blower;
carrying out second electrolytic polishing on the second polished surface by using second electrolytic polishing liquid to form a pure tin metallographic phase display surface; the second electrolytic polishing solution is 70 wt.% of HClO4The volume ratio of the alcohol to absolute ethyl alcohol is as follows: 70 wt.% HClO4Absolute ethyl alcohol is 1:9, the direct current electrolytic voltage of the second electrolytic polishing is 10V, and the time of the second electrolytic polishing is 15 s; and (3) the electrolysis temperature is lower than 40 ℃, the sample to be electrolyzed is shaken during the electrolysis, and after the first electrolytic polishing is finished, the sample is washed by pure water for more than 15s, then washed by absolute ethyl alcohol and dried by a blower with cold air.
Comparative example
The method for displaying the pure tin metallographic phase comprises the following steps:
providing a pure tin sample to be tested: sampling by adopting water cutting equipment, and scribing a sample before sampling to ensure that the surface of the water cutting sample is smooth, and the cross section of the sample is 15 x 15 mm;
it is right the surface of the pure tin sample that awaits measuring adopts first waterborne abrasive paper, second waterborne abrasive paper, third waterborne abrasive paper to polish and fourth waterborne abrasive paper to polish in proper order and forms first polished surface, first waterborne abrasive paper, second waterborne abrasive paper, third waterborne and fourth waterborne abrasive paper are respectively: 600# water-based sandpaper, 1200# water-based sandpaper, 2500# water-based sandpaper and 4000# water-based sandpaper; the grinding speed of the first water-based abrasive paper is 400r/min, the grinding time is 2min, and after grinding is finished, the grinding scraps are washed clean by tap water to prevent the first water-based abrasive paper from being brought into the next grinding process; the grinding speed of the second water-based abrasive paper is 400r/min, the second water-based abrasive paper is ground until the surface is smooth and no previous scratch exists, the new scratch is shallow and the orientation is consistent, the grinding time is 2min, and after the grinding is finished, the abrasive dust is washed clean by tap water to prevent the abrasive dust from being brought into the next grinding process; the grinding speed of the third water-based abrasive paper is 400r/min, the third water-based abrasive paper is ground until the surface is smooth and no previous scratch exists, the new scratch is shallow and the orientation is consistent, the grinding time is 2min, and after the grinding is finished, the abrasive dust is washed clean by tap water to prevent the abrasive dust from being brought into the next grinding process; the fourth aqueous abrasive paper is polished at the rotating speed of 400r/min until the surface is flat and no previous scratch exists, the new scratch is shallow and consistent in orientation, the polishing time is 2min, after polishing is finished, the fourth aqueous abrasive paper is washed clean by tap water, washed by absolute ethyl alcohol and dried by cold air;
and mechanically polishing the first polishing surface to obtain a second polishing surface: using wool fabric polishing cloth, spraying diamond spraying polishing agent with the granularity of 1um on 1/3-1/2 area of the polishing cloth, improving the fine polishing effect, polishing the polishing surface into a mirror surface at the polishing speed of 350r/min for 5min, washing the polished surface with tap water, washing the polished surface with absolute ethyl alcohol, and drying the polished surface with cold air;
and chemically corroding the second polished surface to obtain a metallographic display surface: the chemical corrosive liquid is: 5ml (36% by volume) HCl +95ml pure water +2 drops of H2O2And immersing the tin sample with the second polished surface in a chemical corrosive liquid for 60s, washing the tin sample with pure water for more than 15s after the immersion is finished, washing the tin sample with absolute ethyl alcohol, and drying the tin sample with cold air of a blower.
The display surfaces of the pure tin metallography described in the test examples 1 and 2 and the comparative example were photographed with a metallographic microscope, and the grain sizes were marked on the pictures, and the results are shown in fig. 1 to 3. FIG. 1 is a photomicrograph of the display surface of a pure tin phase as described in example 1, and FIG. 2 is a photomicrograph of the display surface of a pure tin phase as described in example 2; fig. 3 is a photomicrograph of the display surface of a pure tin phase described in the comparative example. As can be seen from the graphs 1-3, the pure tin phase shown in the graphs 1 and 2 is successfully displayed, the grain boundary is clear and attractive, the grain size can be easily counted, and the grain boundary shown in the graph 3 is fuzzy and is difficult to count the grain size.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (8)
1. A method for displaying a pure tin metallographic phase is characterized by comprising the following steps:
providing a pure tin sample to be detected;
sequentially polishing the surface of the pure tin sample to be detected by adopting first water-based abrasive paper, second water-based abrasive paper and third water-based abrasive paper to form a first polished surface, wherein the grain sizes of the first water-based abrasive paper, the second water-based abrasive paper and the third water-based abrasive paper are sequentially increased;
carrying out first electrolytic polishing on the first polished surface by using first electrolytic polishing liquid to form a second polished surface, wherein the first electrolytic polishing liquid is HClO4And ethanol, wherein the direct current electrolytic voltage of the first electrolytic polishing is 25-30V, and the time of the first electrolytic polishing is 50-70 s;
carrying out second electrolytic polishing on the second polished surface by using second electrolytic polishing liquid to form a display surface of a pure tin metallographic phase, wherein the second electrolytic polishing liquid is HClO4And ethanol, wherein the direct current electrolytic voltage of the second electrolytic polishing is 6-10V, and the time of the second electrolytic polishing is 15-25 s.
2. The method for displaying the pure tin metallographic phase according to claim 1, wherein the first aqueous sandpaper, the second aqueous sandpaper, and the third aqueous sandpaper are each: 600# water sand paper, 1200# water sand paper and 2500# water sand paper.
3. The method for displaying the pure tin metallographic phase according to claim 2, wherein the first aqueous abrasive paper, the second aqueous abrasive paper and the third aqueous abrasive paper are used for polishing at a rotation speed of 350 to 450r/min for 1 to 3 min.
4. The method for displaying pure tin metallographic phase according to claim 1, wherein said first electrolytic polishing solution and said second electrolytic polishing solution are 70 wt.%HClO of4Mixed with absolute ethanol, 70 wt.% of HClO4The volume ratio of the alcohol to absolute ethyl alcohol is as follows: 70 wt.% HClO4The ratio of absolute ethyl alcohol is 1: 9.
5. The method for displaying pure tin metallographic phase according to claim 1, wherein an anode of said first electropolishing and said second electropolishing is a pure tin sample, and a cathode thereof is stainless steel.
6. The method for displaying the pure tin metallographic phase according to claim 1, further comprising, after the end of the first electropolishing: and washing the second polished surface for more than 15 seconds by adopting pure water, washing by using absolute ethyl alcohol, and finally drying.
7. The method for displaying a pure tin metallographic phase according to claim 1, further comprising, after the second electrolytic polishing is completed: and washing the display surface of the pure tin metallographic phase for more than 15 seconds by adopting pure water, washing by using absolute ethyl alcohol, and finally drying.
8. The method for displaying the pure tin metallographic phase as claimed in claim 1, wherein the steps of scribing the pure tin sample to be tested and then performing water cutting are further included before the surfaces of the pure tin sample to be tested are sequentially polished by using the first water-based abrasive paper, the second water-based abrasive paper and the third water-based abrasive paper.
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