CN101104935A - Metallographic etching agent - Google Patents
Metallographic etching agent Download PDFInfo
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- CN101104935A CN101104935A CNA2007101204114A CN200710120411A CN101104935A CN 101104935 A CN101104935 A CN 101104935A CN A2007101204114 A CNA2007101204114 A CN A2007101204114A CN 200710120411 A CN200710120411 A CN 200710120411A CN 101104935 A CN101104935 A CN 101104935A
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- metallographic
- etching agent
- acid
- water
- acetone
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Abstract
The invention discloses a corrosive for metallography, which is composed of hydrofluoric acid, nitric acid, acetone, acetic anhydride and water. With the inventive corrosive, the metallographic observation surface is bright, the grain boundary of metallurgical structure is clear, and the alpha phase or other phases precipitated by diffusion are easy to distinguish. The invention is particularly suitable for the use as a corrosive for approximate beta Ti alloys and metastable beta Ti alloys.
Description
Technical field
The present invention relates to a kind of metallographic etching agent, be particularly suitable for the nearly β of aging state, the etching pit of metastable beta-titanium alloy.
Background technology
In the titanium alloy research process, the difference of the difference of material composition, processing thermal treatment process tends to obtain dissimilar metallographic structures, and the performance of final alloy is difference to some extent also.In order to obtain required titanium alloy, must observe the metallographic structure of alloy, and the bonding properties test data, in time adjust composition, complete processing or the thermal treatment process etc. of alloy.
Usually, the metallographic etching agent of titanium alloy is made up of components such as hydrofluoric acid, nitric acid, hydrochloric acid, water that ((patent No. is: ZL97103866.x) as patent " a kind of metallographic etching agent ".Adopt above-mentioned metallographic etching agent corrosion titanium alloy, the particularly nearly beta-titanium alloy of aging state or metastable beta-titanium alloy, tend to form the film like pollution layer that one deck is difficult to get rid of on the metallographic specimen surface, the observation surface blur is unclear, cause the precipitated phase pattern to be difficult to identification, to the observation of metallographic structure with distinguish and have a negative impact.
Summary of the invention
The present invention seeks to shortcoming at existing metallographic etching agent existence, a kind of new metallographic etching agent is provided, this metallographic etching agent can make in the metallographic structure crystal boundary clear, differentiate easily α that β matrix and timeliness separate out mutually or other precipitated phase, be very beneficial for the particularly observation of the nearly β of aging state, metastable beta-titanium alloy metallographic structure.
Realize that technical scheme of the present invention is:
A kind of metallographic etching agent is done and water is formed by hydrofluoric acid, nitric acid, acetone, acetic acid, and the volume percent of its each component is:
Hydrofluoric acid (mass percent concentration is 40%) 10～15%
Nitric acid (mass percent concentration is 65%) 10～15%
Acetone 15～20%
Acetic acid does 10～20%
All the other are water.
Preparation method of the present invention proportionally earlier places plastic ware with water, adds hydrofluoric acid and nitric acid then, adds acetone and acetic acid at last and do, and mixedly evenly gets final product.
Advantage of the present invention and beneficial effect: use metallographic etching agent of the present invention and can make in the metallographic structure crystal boundary clear, differentiate easily α that β matrix and timeliness separate out mutually or other precipitated phase, be very beneficial for the particularly observation of the nearly β of aging state, metastable beta-titanium alloy metallographic structure.
Embodiment
Embodiment 1:
Earlier 55ml water is placed plastic ware, add 10ml hydrofluoric acid (mass percent concentration is 40%) and 10ml nitric acid (mass percent concentration is 65%) then, add the acetone of 15ml and the acetic acid of 10ml at last and do, mix.
Embodiment 2:
Earlier 42ml water is placed plastic ware, add 12ml hydrofluoric acid (mass percent concentration is 40%) and 12ml nitric acid (mass percent concentration is 65%) then, add the acetone of 18ml and the acetic acid of 16ml at last and do, mix.
Embodiment 3:
Earlier 40ml water is placed plastic ware, add 15ml hydrofluoric acid (mass percent concentration is 40%) and 15ml nitric acid (mass percent concentration is 65%) then, add the acetone of 15ml and the acetic acid of 15ml at last and do, mix.
After treating that corrosive fluid prepares, the TB8 titanium alloy sample after the polishing is immersed in the metallographic etchant for preparing, sample metallographicobservation face is vertical with the etching reagent liquid level during immersion, can slightly rock sample when etch, and the etch time is 5～10 seconds.The intact alloy sample that takes out of etch, water is rinsed well repeatedly, again with the cotton balls of being stained with alcohol wipe samples metallographicobservation face gently, natural airing or dry up with hair dryer.Like this, just obtained required metallographic structure observation sample.
Claims (1)
1. metallographic etching agent is done and water is formed by hydrofluoric acid, nitric acid, acetone, acetic acid, and the volume percent of its each component is:
Hydrofluoric acid (mass percent concentration is 40%) 10～15%
Nitric acid (mass percent concentration is 65%) 10～15%
Acetone 15～20%
Acetic acid does 10～20%
All the other are water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101204114A CN100513645C (en) | 2007-08-17 | 2007-08-17 | Metallographic etching agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101204114A CN100513645C (en) | 2007-08-17 | 2007-08-17 | Metallographic etching agent |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101104935A true CN101104935A (en) | 2008-01-16 |
| CN100513645C CN100513645C (en) | 2009-07-15 |
Family
ID=38999010
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007101204114A Expired - Fee Related CN100513645C (en) | 2007-08-17 | 2007-08-17 | Metallographic etching agent |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100513645C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101603894B (en) * | 2009-07-16 | 2012-01-04 | 厦门大学 | Etching agent for titanium carbonitride coating on surface of hard alloy cutter and method for using same |
| CN102866047A (en) * | 2012-09-28 | 2013-01-09 | 昆明理工大学 | Method for preparing metallographic display sample made of Ti-Al laminated composite material |
| CN104677716A (en) * | 2015-02-11 | 2015-06-03 | 西安建筑科技大学 | Pretreatment method for observing titanium fiber metallographic structure sintering neck |
| CN106757030A (en) * | 2016-12-29 | 2017-05-31 | 北京有色金属研究总院 | A kind of metallographic etching agent of titanium alloy |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4345969A (en) * | 1981-03-23 | 1982-08-24 | Motorola, Inc. | Metal etch solution and method |
-
2007
- 2007-08-17 CN CNB2007101204114A patent/CN100513645C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101603894B (en) * | 2009-07-16 | 2012-01-04 | 厦门大学 | Etching agent for titanium carbonitride coating on surface of hard alloy cutter and method for using same |
| CN102866047A (en) * | 2012-09-28 | 2013-01-09 | 昆明理工大学 | Method for preparing metallographic display sample made of Ti-Al laminated composite material |
| CN104677716A (en) * | 2015-02-11 | 2015-06-03 | 西安建筑科技大学 | Pretreatment method for observing titanium fiber metallographic structure sintering neck |
| CN106757030A (en) * | 2016-12-29 | 2017-05-31 | 北京有色金属研究总院 | A kind of metallographic etching agent of titanium alloy |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100513645C (en) | 2009-07-15 |
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| TR01 | Transfer of patent right |
Effective date of registration: 20190403 Address after: 101407 No. 11 Xingke East Street, Yanqi Economic Development Zone, Huairou District, Beijing Patentee after: Research Institute of engineering and Technology Co., Ltd. Address before: 100088, 2, Xinjie street, Beijing Patentee before: General Research Institute for Nonferrous Metals |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090715 Termination date: 20200817 |