CN113092226A - Aluminum and aluminum alloy metallographic corrosive agent and metallographic test method for aluminum-containing welding part of lithium ion battery - Google Patents
Aluminum and aluminum alloy metallographic corrosive agent and metallographic test method for aluminum-containing welding part of lithium ion battery Download PDFInfo
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 82
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 80
- 238000003466 welding Methods 0.000 title claims abstract description 53
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 44
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 27
- 239000003518 caustics Substances 0.000 title claims abstract description 18
- 238000010998 test method Methods 0.000 title claims abstract description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 50
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 48
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 32
- 238000000227 grinding Methods 0.000 claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 22
- 238000005070 sampling Methods 0.000 claims abstract description 17
- 239000011780 sodium chloride Substances 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 238000005520 cutting process Methods 0.000 claims description 26
- 238000004140 cleaning Methods 0.000 claims description 12
- 230000007797 corrosion Effects 0.000 claims description 9
- 238000005260 corrosion Methods 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 9
- 238000012360 testing method Methods 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 abstract description 12
- 238000002844 melting Methods 0.000 abstract description 11
- 230000008018 melting Effects 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 7
- 230000035515 penetration Effects 0.000 description 20
- 230000003628 erosive effect Effects 0.000 description 17
- 239000000126 substance Substances 0.000 description 9
- 239000007864 aqueous solution Substances 0.000 description 7
- 244000137852 Petrea volubilis Species 0.000 description 6
- 238000005498 polishing Methods 0.000 description 6
- 239000004576 sand Substances 0.000 description 6
- 238000002791 soaking Methods 0.000 description 6
- 238000010587 phase diagram Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000004927 fusion Effects 0.000 description 4
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 4
- 239000010931 gold Substances 0.000 description 4
- 229910052737 gold Inorganic materials 0.000 description 4
- 210000001519 tissue Anatomy 0.000 description 4
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000005530 etching Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 229920006255 plastic film Polymers 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 206010031264 Osteonecrosis Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 238000005282 brightening Methods 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 210000000170 cell membrane Anatomy 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 210000001508 eye Anatomy 0.000 description 1
- 238000009459 flexible packaging Methods 0.000 description 1
- 210000001035 gastrointestinal tract Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 210000004877 mucosa Anatomy 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 210000002345 respiratory system 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
- 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
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- 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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- 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
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
- G01N2001/2866—Grinding or homogeneising
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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
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
- G01N2001/2873—Cutting or cleaving
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Abstract
The invention discloses a metallographic corrosive agent for aluminum and aluminum alloy and a metallographic test method for an aluminum-containing welding part of a lithium ion battery, wherein the metallographic corrosive agent for aluminum and aluminum alloy comprises the following raw materials in percentage by mass: 1-20% of sodium hydroxide, 1-20% of sodium chloride, 10-50% of ethanol and the balance of water; the invention adopts the formula of an alkaline system, can remove a compact oxide layer left in the sampling and grinding process as soon as possible under the relatively safe condition, so that the observed surface of the material is smooth and bright, the difference between a welding melting area and other areas is obvious, the aluminum and aluminum alloy metallographic corrosive is easily identified and distinguished as corrosive liquid, and a sample meeting the observation requirement can be prepared by corroding for 30s at the fastest speed, thus being convenient and fast.
Description
Technical Field
The invention belongs to the technical field of material detection, and particularly relates to a metallographic corrosive agent for aluminum and aluminum alloy and a metallographic test method for an aluminum-containing welding part of a lithium ion battery.
Background
The lithium ion battery needs to be internally sealed due to the requirement of internal materials, and common packaging modes in the market can be aluminum plastic film flexible packaging and metal packaging. The sealing mode of the aluminum plastic film flexible package is mainly sealed by a vacuumizing heat sealing machine; the metal package is mainly divided into an aluminum shell package and a steel shell package, and the sealing mode is mainly sealed by a laser spot welding machine.
After the aluminum shell is subjected to laser welding, a high-temperature melting area and an unmelted area form an obvious boundary, and the welding effect can be evaluated by judging whether the depth and the width of the melting area meet the standard requirements or not. The microscopic metallographic detection of the welding area becomes the primary detection means for adjusting the parameters of the laser welding process of the lithium ion battery and supervising the capability of the laser welding equipment, plays an important role and greatly improves the production yield.
Because the aluminum has active chemical property, the oxide film on the surface is very compact and corrosion resistant, and the preparation method comprises the following steps of: sampling, grinding, corrosion, cleaning and dehydration, wherein the grinding step can strengthen and stabilize the oxide film on the surface of the material, prevent the effect of further brightening the pattern and influence the subsequent corrosion.
In order to destroy a compact oxide film formed in the grinding process, an acidic corrosion system containing hydrofluoric acid is often used for chemical corrosion to observe the metallographic structure of a sample in the prior art, but the system is corroded too fast, so that the surface of the whole material is too bright, a welding area is not easy to identify and distinguish, and HF has strong corrosivity and stimulates clothes, skin, eyes, respiratory tract and digestive tract mucosa: the contact part is obviously burnt, so that tissue protein is dehydrated and dissolved, can quickly penetrate through a horny layer, permeates into deep tissues, can dissolve cell membranes, and quickly permeates into bones to react with Ca ions, thereby causing the bone necrosis; inhalation of vapor or contact with the skin can cause difficult-to-heal burns; the patients who touch the artificial limb are not easy to perceive and feel no at first, and the patients who need to cut the artificial limb are likely to hurt the body, so that many safety accidents occur once, and the use is avoided as much as possible.
Disclosure of Invention
The invention aims to provide an aluminum and aluminum alloy metallographic corrosive agent, which adopts a formula of an alkaline system, can remove a compact oxide layer left in the sampling and grinding processes as soon as possible under a safer condition, enables the observed surface of a material to be flat and bright, has obvious difference between a welding melting area and other areas, and is easy to identify and distinguish.
The invention also aims to provide a metallographic test method for the aluminum-containing welding part of the lithium ion battery, wherein the metallographic corrosive agent of aluminum and aluminum alloy is used as corrosive liquid, so that a sample meeting the observation requirement can be prepared by corroding for 30s at the fastest speed, and the method is convenient and rapid.
In order to achieve the purpose, the invention adopts the technical scheme that:
the aluminum and aluminum alloy metallographic corrosive agent comprises the following raw materials in percentage by mass: 1-20% of sodium hydroxide, 1-20% of sodium chloride, 10-50% of ethanol and the balance of water.
Further, the aluminum and aluminum alloy metallographic corrosive agent preferably comprises the following raw materials in percentage by mass: 1-2% of sodium hydroxide, 1-5% of sodium chloride, 10-15% of ethanol and the balance of water.
Furthermore, the aluminum and aluminum alloy metallographic corrosive agent preferably comprises the following raw materials in percentage by mass: 1.2% of sodium hydroxide, 2.0% of sodium chloride, 10.0% of ethanol and the balance of water.
The invention provides a metallographic test method for an aluminum-containing welding part of a lithium ion battery, which comprises the following steps of: sampling, grinding, corroding, cleaning, dehydrating and observing a metallographic structure;
further, in the corrosion step, the ground sample piece is placed into the aluminum and aluminum alloy metallographic corrosive agent to be soaked for 30-300 s; in the most preferred etchant consisting of 1.2% sodium hydroxide, 2.0% sodium chloride, 10.0% ethanol, and the balance water, the effective erosion of the sample can be achieved within only 30 seconds.
In the grinding step, the edges and corners are ground flat, the observation surface is ground flat, and the deformation layer during cutting is ground away.
The step of cleaning by using ethanol is also included after the grinding.
In the cleaning and dewatering steps, the sample piece is washed by water and then wiped clean.
The aluminum-containing welding part of the lithium ion battery comprises a welding part of an aluminum shell of the lithium ion battery, a welding part of an aluminum top cover of the lithium ion battery and the aluminum shell, a welding part of the aluminum top cover of the lithium ion battery and an aluminum sealing nail, and a welding part of a pole of the lithium ion battery and a busbar.
The aluminum and aluminum alloy metallographic corrosive provided by the invention has mild formula and low cost, an alkali-alcohol mixed aqueous solution system is adopted, NaOH in the system is used as a main reaction reagent, aluminum and surface oxides thereof are reacted, the concentration of the aluminum and surface oxides thereof is not too high, and otherwise, the interface tissue structure is damaged; NaCl is used as an auxiliary reagent, and the corrosivity of chloride ions is utilized to prevent the oxide layer from being formed again; EtOH is used as an auxiliary reagent, and can ensure the surface of the material to be clean and participate in preventing the oxide layer from being formed again.
Compared with the prior art, the invention has the following advantages:
1. the aluminum and aluminum alloy metallographic corrosive provided by the invention has a good corrosion effect on the aluminum-containing welding part of the lithium ion battery, and after the aluminum and aluminum alloy metallographic corrosive is corroded, the microscopic metallographic phase of the welding area can be observed easily, so that the welding effect can be evaluated through the depth and width of the melting area;
2. the aluminum and aluminum alloy metallographic corrosive agent provided by the invention can improve the condition of a tissue interface, so that a defect area is easy to distinguish, a molten area and an unmelted area are clear in shade, and the boundary is clear;
3. the aluminum and aluminum alloy metallographic corrosive provided by the invention has a mild formula, and the common HF with strong corrosivity is replaced by the low-concentration sodium hydroxide, sodium chloride and ethanol, so that the operation safety is improved;
3. the raw materials in the formula of the aluminum and aluminum alloy metallographic corrosive provided by the invention are common and cheap substances, and the aluminum and aluminum alloy metallographic corrosive has the advantages of small usage amount, low cost and high economy;
4. the metallographic corrosive agent for aluminum and aluminum alloy provided by the invention can complete the corrosion process only within 30s under the condition of better raw material proportion, thereby optimizing the test flow and improving the timeliness and efficiency of the test.
Drawings
FIG. 1 is a gold phase diagram of the welded junction of the aluminum case of the lithium ion battery in example 1;
FIG. 2 is a metallographic image of the weld between the aluminum top cover and the aluminum can of the lithium ion battery in example 2;
FIG. 3 is a metallographic image of the weld between the aluminum top cover and the aluminum sealing nail of the lithium ion battery in example 3;
FIG. 4 is a metallographic view of the welded junction between the lithium ion battery post and the busbar according to example 4;
FIG. 5 is a gold phase diagram of the welding position of the aluminum top cover and the aluminum shell of the lithium ion battery in comparative example 1;
fig. 6 is a gold phase diagram of the welding position of the aluminum top cover and the aluminum shell of the lithium ion battery in the comparative example 2.
Detailed Description
The present invention will be described in detail with reference to the following examples and drawings.
Example 1
The method for observing the welding penetration melting width of the lithium ion battery aluminum shell comprises the following steps:
(1) cutting and sampling: cutting and sampling the welding part of the lithium ion battery aluminum shell by adopting a handheld cutting machine, wherein a sample piece needs to keep a complete welding area and grinding operability;
(2) grinding the edges and corners of the sample piece by using a sand mill until the possibility of no scratch exists, and grinding an obvious slippage deformation layer generated during cutting off an observation surface; polishing the observation surface by using sand paper until the observation surface has obvious mirror reflection; cleaning oil stains on the surface of the sample by using ethanol;
(3) chemical erosion: preparing an alkali-alcohol mixed aqueous solution system as an erosion liquid according to the mass percent of 1.2% of NaOH + 2% of NaCl + 10% of EtOH + 86.6% of water, soaking the sample piece in the erosion liquid for 30s, then wiping and dehydrating the sample piece after washing with water, wherein the surface of the sample piece corroded by the process is bright, a fused area and an unmelted area can be obviously distinguished, the boundary is clear and is easy to distinguish, and finally, metallographic observation is carried out, and the result is shown in figure 1.
As can be seen from FIG. 1, clear welding boundaries can be seen from the phase diagram, and the penetration and the width of the aluminum shell welding can be effectively observed; the maximum penetration is 1673 μm, the effective penetration is 1373 μm, and the penetration width is 1265 μm.
Example 2
The method for observing the welding penetration and melting width of the aluminum top cover and the aluminum shell of the lithium ion battery comprises the following steps of:
(1) cutting and sampling: cutting and sampling the welding part of the aluminum top cover and the aluminum shell of the lithium ion battery by adopting a handheld cutting machine, wherein a sample piece needs to keep a complete welding area and grinding operability;
(2) grinding the edges and corners of the sample piece by using a sand mill until the possibility of no scratch exists, and grinding an obvious slippage deformation layer generated during cutting off an observation surface; polishing the observation surface by using sand paper until the observation surface has obvious mirror reflection; cleaning oil stains on the surface of the sample by using ethanol;
(3) chemical erosion: preparing an alkali-alcohol mixed aqueous solution system as an erosion liquid according to the mass percent of 1.2% of NaOH + 2% of NaCl + 10% of EtOH + 86.6% of water, soaking the sample piece in the erosion liquid for 30s, then wiping and dehydrating the sample piece after washing with water, wherein the surface of the sample piece corroded by the process is bright, a fused area and an unmelted area can be obviously distinguished, the boundary is clear and is easy to distinguish, and finally, metallographic observation is carried out, and the result is shown in figure 2.
As can be seen from fig. 2, a clear welding boundary can be seen from the metallographic image, and the penetration and the width of the weld between the top cover and the aluminum shell can be effectively observed; the maximum penetration is 2112 μm, the effective penetration is 1565 μm, and the penetration width is 1758 μm.
Example 3
The method for observing the welding penetration and melting width of the aluminum top cover and the aluminum sealing nail of the lithium ion battery comprises the following steps:
(1) cutting and sampling: cutting and sampling the welding part of the aluminum top cover of the lithium ion battery and the aluminum sealing nail by using a handheld cutting machine, wherein a sample piece needs to keep a complete welding area and grinding operability;
(2) grinding the edges and corners of the sample piece by using a sand mill until the possibility of no scratch exists, and grinding an obvious slippage deformation layer generated during cutting off an observation surface; polishing the observation surface by using sand paper until the observation surface has obvious mirror reflection; cleaning oil stains on the surface of the sample by using ethanol;
(3) chemical erosion: preparing an alkali-alcohol mixed aqueous solution system as an erosion liquid according to the mass percentage of 1.2% of NaOH + 2% of NaCl + 10% of EtOH + 86.6% of water, soaking the sample piece in the erosion liquid for 30s, then wiping and dehydrating the sample piece after washing with water, wherein the surface of the sample piece corroded by the process is bright, a fused area and an unmelted area can be obviously distinguished, the boundary is clear and is easy to distinguish, and finally, metallographic observation is carried out, and the result is shown in figure 3.
As can be seen from FIG. 3, clear welding boundaries can be observed from the metallographic image, and the penetration and the width of the weld between the top cover and the sealing nail can be effectively observed; the maximum fusion depth is 583 μm, the effective fusion depth is 505 μm, and the fusion width is 1194 μm.
Example 4
The method for observing the welding penetration and melting width of the lithium ion battery pole and the bus bar comprises the following steps:
(1) cutting and sampling: cutting and sampling the welding position of the lithium ion battery pole and the bus bar by adopting a handheld cutting machine, wherein a sample piece needs to keep a complete welding area and grinding operability;
(2) grinding the edges and corners of the sample piece by using a sand mill until the possibility of no scratch exists, and grinding an obvious slippage deformation layer generated during cutting off an observation surface; polishing the observation surface by using sand paper until the observation surface has obvious mirror reflection; cleaning oil stains on the surface of the sample by using ethanol;
(3) chemical erosion: preparing an alkali-alcohol mixed aqueous solution system as an erosion liquid according to the mass percentage of 1.2% of NaOH + 2% of NaCl + 10% of EtOH + 86.6% of water, soaking the sample piece in the erosion liquid for 30s, then wiping and dehydrating the sample piece after washing with water, wherein the surface of the sample piece corroded by the process is bright, a fused area and an unmelted area can be obviously distinguished, the boundary is clear and is easy to distinguish, and finally, metallographic observation is carried out, and the result is shown in figure 4.
As can be seen from fig. 4, a clear welding boundary can be observed from the metallographic image, and the penetration of the welding between the pole and the busbar can be effectively observed; the maximum penetration was 464 μm.
Comparative example 1
The method for observing the welding penetration and melting width of the aluminum top cover and the aluminum shell of the lithium ion battery comprises the following steps of:
(1) cutting and sampling: cutting and sampling the welding position of the lithium ion battery pole and the bus bar by adopting a handheld cutting machine, wherein a sample piece needs to keep a complete welding area and grinding operability;
(2) grinding the edges and corners of the sample piece by using a sand mill until the possibility of no scratch exists, and grinding an obvious slippage deformation layer generated during cutting off an observation surface; polishing the observation surface by using sand paper until the observation surface has obvious mirror reflection; cleaning oil stains on the surface of the sample by using ethanol;
(3) chemical erosion: according to the mass percentage, the content of NaOH is 1.2 percent and NaNO is 2 percent3Preparing an alkali-alcohol mixed aqueous solution system serving as an etching solution according to the proportion of + 10% of EtOH + 86.6% of water, soaking the sample in the etching solution for 30s, then wiping and dehydrating the sample after water washing, gradually darkening the whole surface of the sample corroded by the process from brightness, enabling the brightness of a molten area to be basically consistent with that of an unmelted area, and carrying out no obvious boundary distinction, and finally carrying out metallographic observation, wherein the result is shown in figure 5.
As can be seen from fig. 5, the weld boundaries of the sample cannot be distinguished from the metallographic image, and the penetration and the weld width cannot be observed.
Comparative example 2
The method for observing the welding penetration and melting width of the aluminum top cover and the aluminum shell of the lithium ion battery comprises the following steps of:
(1) cutting and sampling: cutting and sampling the welding position of the lithium ion battery pole and the bus bar by adopting a handheld cutting machine, wherein a sample piece needs to keep a complete welding area and grinding operability;
(2) grinding the edges and corners of the sample piece by using a sand mill until the possibility of no scratch exists, and grinding an obvious slippage deformation layer generated during cutting off an observation surface; polishing the observation surface by using sand paper until the observation surface has obvious mirror reflection; cleaning oil stains on the surface of the sample by using ethanol;
(3) chemical erosion: according to the mass percentage, the content of Ca (OH) is 0.165 percent2Preparing an alkali-alcohol mixed aqueous solution system serving as an erosion liquid according to the proportion of + 2% NaCl + 10% EtOH + 87.835% water, soaking the sample piece in the erosion liquid for 30s, then wiping and dehydrating the sample piece after washing with water, wherein the surface brightness of the sample piece corroded by the process is general, and the boundary between a molten area and an unmelted area is fuzzy and is not generatedAnd (4) easy to distinguish, and finally carrying out metallographic observation, wherein the result is shown in figure 6.
As can be seen from FIG. 6, the welding boundary of the sample piece is fuzzy and cannot be effectively distinguished, and the penetration and the fusion width cannot be effectively observed.
In conclusion, the etching solution prepared by proportioning 1.2% NaOH, 2% NaCl, 10% EtOH and 86.6% water in the invention can effectively etch the aluminum-containing welding part of the lithium ion battery within 30s, the cleaned welding boundary can be observed in a gold phase diagram, and the weld penetration and weld width can be obtained through testing.
The above detailed description of the metallographic corrosive agent for aluminum and aluminum alloys and the method for metallographic testing of the aluminum-containing welded portion of a lithium ion battery with reference to the embodiments is illustrative and not restrictive, and several embodiments can be cited within the scope of the present invention.
Claims (8)
1. The aluminum and aluminum alloy metallographic corrosive agent is characterized by comprising the following raw materials in percentage by mass: 1-20% of sodium hydroxide, 1-20% of sodium chloride, 10-50% of ethanol and the balance of water.
2. The aluminum and aluminum alloy metallographic corrosive agent according to claim 1, comprising the following raw materials in percentage by mass: 1-2% of sodium hydroxide, 1-5% of sodium chloride, 10-15% of ethanol and the balance of water.
3. The aluminum and aluminum alloy metallographic corrosive agent according to claim 1, comprising the following raw materials in percentage by mass: 1.2% of sodium hydroxide, 2.0% of sodium chloride, 10.0% of ethanol and the balance of water.
4. The metallographic test method for the aluminum-containing welding part of the lithium ion battery is characterized by comprising the following steps of: sampling, grinding, corroding, cleaning, dehydrating and observing a metallographic structure;
in the corrosion step, the ground sample piece is put into the aluminum and aluminum alloy metallographic corrosive agent according to any one of claims 1 to 3 to be soaked for 30 to 300 seconds.
5. The method for metallographic phase test of an aluminum-containing welded part of a lithium ion battery according to claim 4, wherein in the grinding step, the edges and corners are ground flat, the observation surface is ground flat, and the deformation layer during cutting is ground away.
6. The method for metallographic testing of an al-containing weld of a li-ion battery of claim 4, further comprising a step of washing with ethanol after said grinding.
7. The method for metallographic phase test of an aluminum-containing welded part of a lithium ion battery according to claim 4, wherein in the step of cleaning and dehydrating, the sample piece is washed by water and then wiped clean.
8. The metallographic test method for the aluminum-containing welded part of the lithium ion battery according to claim 4, wherein the aluminum-containing welded part of the lithium ion battery comprises a welded part of an aluminum shell of the lithium ion battery, a welded part of an aluminum top cover of the lithium ion battery and the aluminum shell, a welded part of the aluminum top cover of the lithium ion battery and an aluminum sealing nail, and a welded part of a pole of the lithium ion battery and a busbar.
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| CN116288357A (en) * | 2023-03-22 | 2023-06-23 | 湖北亿纬动力有限公司 | Chromogenic corrosive liquid and preparation method and application thereof |
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