CN112697566A - 7075-T6 state aluminum alloy metallographic etchant and etching method - Google Patents
7075-T6 state aluminum alloy metallographic etchant and etching method Download PDFInfo
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- CN112697566A CN112697566A CN202011503987.0A CN202011503987A CN112697566A CN 112697566 A CN112697566 A CN 112697566A CN 202011503987 A CN202011503987 A CN 202011503987A CN 112697566 A CN112697566 A CN 112697566A
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- aluminum alloy
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000005530 etching Methods 0.000 title claims abstract description 17
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000005260 corrosion Methods 0.000 claims abstract description 14
- 230000007797 corrosion Effects 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000004140 cleaning Methods 0.000 claims abstract description 12
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000012153 distilled water Substances 0.000 claims abstract description 10
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 10
- 238000005498 polishing Methods 0.000 claims abstract description 7
- 238000000227 grinding Methods 0.000 claims abstract description 5
- 238000007605 air drying Methods 0.000 claims abstract description 4
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 6
- 229910000853 7075 T6 aluminium alloy Inorganic materials 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 239000004744 fabric Substances 0.000 claims description 4
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 4
- 239000010931 gold Substances 0.000 claims description 4
- 229910052737 gold Inorganic materials 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 238000011010 flushing procedure Methods 0.000 claims 1
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 238000005406 washing Methods 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
- G01N1/34—Purifying; Cleaning
-
- 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)
- General Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Molecular Biology (AREA)
- Investigating And Analyzing Materials By Characteristic Methods (AREA)
Abstract
The application relates to a 7075-T6 state aluminum alloy metallographic etchant and an etching method. The 7075-T6 state aluminum alloy metallographic corrosive liquid comprises the following components in percentage by mass: 95% distilled water; 4% nitric acid; 1% hydrofluoric acid. The 7075-T6 state aluminum alloy metallographic corrosion method comprises the following steps: preparing a metallographic corrosive liquid; grinding and polishing an aluminum alloy sample; dripping the metallographic etchant on the surface of the aluminum alloy sample to ensure that the surface of the aluminum alloy sample is completely covered by the metallographic etchant to corrode the aluminum alloy sample; and cleaning and air-drying the aluminum alloy sample, and observing the metallographic structure of the aluminum alloy sample. The 7075-T6 state aluminum alloy metallographic corrosive liquid and the 7075-T6 state aluminum alloy after being corroded by the corrosion method are clear in metallographic structure, so that 7075 metallographic corrosion is simple and convenient, and the cost is greatly reduced.
Description
Technical Field
The application relates to the technical field of metallographic detection of metal materials, in particular to 7075-T6 state aluminum alloy metallographic corrosive liquid and a corrosion method.
Background
The 7075-T6 aluminum alloy has a metallographic structure which is difficult to corrode, and even if corroded, the structure is fuzzy. The texture is generally better characterized by anodic coating, but this corrosion method is costly, time consuming and inefficient. Therefore, a simple and quick corrosion method suitable for observing 7075 metallographic structures is urgently needed.
Disclosure of Invention
In order to solve the technical problems in the prior art, the embodiment of the application provides a 7075-T6 state aluminum alloy metallographic etchant and an etching method. The specific technical scheme is as follows:
in a first aspect, a 7075-T6 state aluminum alloy metallographic etchant is provided, which comprises the following components by mass percent: 95% distilled water; 4% nitric acid; 1% hydrofluoric acid.
In a second aspect, a 7075-T6 state aluminum alloy metallographic corrosion method is provided, which comprises the following steps:
preparing a metallographic corrosive liquid according to the mass percentage of the 7075-T6 state aluminum alloy metallographic corrosive liquid in the first aspect; grinding and polishing an aluminum alloy sample; dripping the metallographic etchant on the surface of the aluminum alloy sample to ensure that the surface of the aluminum alloy sample is completely covered by the metallographic etchant to corrode the aluminum alloy sample; and cleaning and air-drying the aluminum alloy sample, and observing the metallographic structure of the aluminum alloy sample.
In a first possible implementation manner of the second aspect, the method for preparing the metallographic etchant solution comprises the following steps: adding 4 mass percent of nitric acid and 1 mass percent of hydrofluoric acid into 95 mass percent of distilled water; and stirring the mixed solution to uniformly mix the nitric acid, the hydrofluoric acid and the distilled water to form the metallographic etchant.
In a second possible implementation manner of the second aspect, when the aluminum alloy sample is ground, the aluminum alloy sample is ground by using 200#, 400#, 600#, 800#, and 1000# of metallographic abrasive paper in sequence.
In a third possible implementation manner of the second aspect, when polishing the aluminum alloy sample, the aluminum alloy sample is placed on a gold velvet cloth and polished to a mirror surface.
In a fourth possible implementation manner of the second aspect, the metallographic etchant has a time for etching the aluminum alloy test piece of 80 s.
In a fifth possible implementation manner of the second aspect, the metallographic etchant is dropped on the surface of the aluminum alloy test sample by using a dropper.
In a sixth possible implementation manner of the second aspect, the method for cleaning the aluminum alloy test piece comprises the following steps: washing the aluminum alloy sample subjected to corrosion under flowing clear water; and putting the aluminum alloy sample into an ultrasonic cleaning machine for cleaning again.
With reference to the sixth possible implementation manner of the second aspect, in a seventh possible implementation manner of the second aspect, the time for cleaning the aluminum alloy test sample by the ultrasonic cleaning machine is 3-4 min.
In an eighth possible implementation manner of the second aspect, the aluminum alloy test piece is blow-dried by using a blower.
Compared with the prior art, the application has the advantages that:
according to the 7075-T6 state aluminum alloy metallographic etchant and the etching method, the etched 7075-T6 state aluminum alloy metallographic structure is clear, so that 7075 metallographic etching is simple and convenient, and the cost is greatly reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a schematic flow chart illustrating the steps of a method for metallographic etching of aluminum alloy in the 7075-T6 state according to an embodiment of the present application;
FIG. 2 is a diagram of the gold phase (X200) of a 7075-T6 temper aluminum alloy coupon of an embodiment of the present application after corrosion.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In one embodiment of the application, raw materials are weighed according to the mass percentage of the 7075-T6 state aluminum alloy metallographic etchant, and the raw materials comprise 95% of distilled water, 4% of nitric acid and 1% of hydrofluoric acid.
Referring to FIG. 1, a schematic flow chart of steps of a 7075-T6 state aluminum alloy metallographic etching method according to an embodiment of the present application is shown. As shown in the figure, the 7075-T6 state aluminum alloy metallographic etching method 1 comprises the following steps 101 to 104, wherein:
And step 103, corroding the sample. And (4) dripping the metallographic corrosive liquid on the surface of the aluminum alloy sample to completely cover the surface of the aluminum alloy sample with the metallographic corrosive liquid so as to corrode the aluminum alloy sample. Specifically, a dropper is adopted to drop the metallographic etchant on the surface of the aluminum alloy sample, the surface of the aluminum alloy sample is completely covered by the metallographic etchant, and meanwhile, the time for corroding the aluminum alloy sample by the metallographic etchant is controlled to be 80 s.
In summary, the application provides the 7075-T6 state aluminum alloy metallographic etchant and the etching method, the etched 7075-T6 state aluminum alloy metallographic structure is clearer, so that 7075 metallographic etching becomes simple and convenient, and the cost is greatly reduced.
The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the application as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.
Claims (10)
1. The 7075-T6 state aluminum alloy metallographic etchant is characterized by comprising the following components in percentage by mass:
95% distilled water;
4% nitric acid;
1% hydrofluoric acid.
2. A7075-T6 state aluminum alloy metallographic corrosion method is characterized by comprising the following steps:
preparing a metallographic etchant according to the mass percentage of the metallographic etchant for the 7075-T6 aluminum alloy in the state of claim 1;
grinding and polishing an aluminum alloy sample;
dripping the metallographic etchant on the surface of the aluminum alloy sample to ensure that the surface of the aluminum alloy sample is completely covered by the metallographic etchant to corrode the aluminum alloy sample;
and cleaning and air-drying the aluminum alloy sample, and observing the metallographic structure of the aluminum alloy sample.
3. The method for metallographic corrosion of a 7075-T6 state aluminum alloy according to claim 2, wherein the method for preparing the metallographic corrosive liquid comprises the following steps:
adding 4 mass percent of nitric acid and 1 mass percent of hydrofluoric acid into 95 mass percent of distilled water;
and stirring the mixed solution to uniformly mix the nitric acid, the hydrofluoric acid and the distilled water to form the metallographic corrosive liquid.
4. A method of metallographic etching of an aluminium alloy in the 7075-T6 state according to claim 2, wherein when grinding the aluminium alloy sample, the aluminium alloy sample is ground by using metallographic sandpaper of 200#, 400#, 600#, 800#, 1000#, in that order.
5. The method of metallographic etching of aluminum alloy 7075-T6 according to claim 2, wherein said aluminum alloy specimens are polished to a mirror finish by placing said specimens on a spun gold cloth.
6. The method for metallographic etching of 7075-T6 aluminum alloy according to claim 2, wherein the time for the metallographic etchant to etch the aluminum alloy test piece is 80 s.
7. The method for metallographic etching of 7075-T6 state aluminum alloy according to claim 2, wherein the metallographic etchant is dripped on the surface of the aluminum alloy test sample by a dropper.
8. The method of metallographic etching of an aluminum alloy in the 7075-T6 state according to claim 2, wherein the method of cleaning said aluminum alloy specimens comprises the steps of:
flushing the aluminum alloy sample subjected to corrosion under flowing clean water;
and putting the aluminum alloy sample into an ultrasonic cleaning machine for cleaning again.
9. The method for metallographic corrosion of a 7075-T6 state aluminum alloy according to claim 8, wherein the time for cleaning the aluminum alloy sample by the ultrasonic cleaning machine is 3-4 min.
10. The method for metallographic corrosion of aluminum alloy in the 7075-T6 state according to claim 2, wherein the aluminum alloy sample is blow-dried by a blower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011503987.0A CN112697566A (en) | 2020-12-18 | 2020-12-18 | 7075-T6 state aluminum alloy metallographic etchant and etching method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011503987.0A CN112697566A (en) | 2020-12-18 | 2020-12-18 | 7075-T6 state aluminum alloy metallographic etchant and etching method |
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| CN112697566A true CN112697566A (en) | 2021-04-23 |
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| CN202011503987.0A Pending CN112697566A (en) | 2020-12-18 | 2020-12-18 | 7075-T6 state aluminum alloy metallographic etchant and etching method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114941139A (en) * | 2022-05-11 | 2022-08-26 | 云南大学 | Metallographic corrosive agent for 7000 series aluminum alloy and corrosion method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005248214A (en) * | 2004-03-01 | 2005-09-15 | Aisin Keikinzoku Co Ltd | Surface treatment method for aluminum alloy |
| CN105088237A (en) * | 2014-05-20 | 2015-11-25 | 钱虎 | Application method of novel 7-series aluminum alloy (Al-Zn-Mg-Cu) etchant solution |
| CN105088112A (en) * | 2015-06-30 | 2015-11-25 | 黄河科技学院 | Heat treatment technology for 7-series high-strength aluminum alloy |
-
2020
- 2020-12-18 CN CN202011503987.0A patent/CN112697566A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005248214A (en) * | 2004-03-01 | 2005-09-15 | Aisin Keikinzoku Co Ltd | Surface treatment method for aluminum alloy |
| CN105088237A (en) * | 2014-05-20 | 2015-11-25 | 钱虎 | Application method of novel 7-series aluminum alloy (Al-Zn-Mg-Cu) etchant solution |
| CN105088112A (en) * | 2015-06-30 | 2015-11-25 | 黄河科技学院 | Heat treatment technology for 7-series high-strength aluminum alloy |
Non-Patent Citations (4)
| Title |
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| 丁红燕等: "《工程材料实验》", 31 December 2017, 西安电子科技大学出版社 * |
| 朱浩: "TiAl金属间化合物损伤机理的研究", 《中国优秀博硕士学位论文全文数据库（硕士） 工程科技I辑 2005年期》 * |
| 沈桂琴: "《化学金相技术》", 31 August 1992, 北京航空航天大学出版社 * |
| 童浩: "挤压-A方式ECA集成大应变技术及其对铝材组织性能的调控", 《中国优秀硕士学位论文全文数据库 工程科技I辑 2019年期》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114941139A (en) * | 2022-05-11 | 2022-08-26 | 云南大学 | Metallographic corrosive agent for 7000 series aluminum alloy and corrosion method thereof |
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Application publication date: 20210423 |