CN105925983B - A kind of metallographic etching agent and its application method of As-extruded magnesium lithium alloy - Google Patents
A kind of metallographic etching agent and its application method of As-extruded magnesium lithium alloy Download PDFInfo
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- CN105925983B CN105925983B CN201610487794.8A CN201610487794A CN105925983B CN 105925983 B CN105925983 B CN 105925983B CN 201610487794 A CN201610487794 A CN 201610487794A CN 105925983 B CN105925983 B CN 105925983B
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- lithium alloy
- magnesium lithium
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/16—Acidic compositions
- C23F1/22—Acidic compositions for etching magnesium or alloys thereof
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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
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Abstract
The invention discloses the metallographic etching agents and its application method of a kind of As-extruded magnesium lithium alloy, the ethyl alcohol that the citric acid and mass fraction that the hydrofluoric acid for being 40% by mass fraction, mass fraction are 60% are 98% mixes, and the volume ratio of the hydrofluoric acid and the citric acid, the ethyl alcohol is preferably 40:20:40, so as to conveniently and efficiently complete the etching pit of As-extruded magnesium lithium alloy, and the metallographic structure complete display the most of the As-extruded magnesium lithium alloy after etching pit, crystal boundary is clear and legible, this facilitates observation and analysis to metallographic structure.
Description
Technical field
The present invention relates to the etching pit field of magnesium lithium alloy more particularly to a kind of etching pits of As-extruded magnesium lithium alloy
Agent and its application method.
Background technique
Magnesium lithium alloy is most light metal material used in actual industrial production, and its with specific strength high, specific stiffness
High, the features such as machinability is good, therefore suffer from many fields such as electronic apparatus, aerospace, defence and military wide
General application.
As-extruded magnesium lithium alloy is a kind of the most commonly used magnesium lithium alloy.Due to material used by process at
Point, crushing strength and heat treatment process it is different, therefore there is very big difference in the metallographic structure of the As-extruded magnesium lithium alloy processed
Not, this makes the performance of As-extruded magnesium lithium alloy very big difference occur.In order to produce the satisfactory As-extruded of performance
Magnesium lithium alloy needs the metallographic structure to various As-extruded magnesium lithium alloys to observe, and binding performance test data, thus right
Material composition, crushing strength and heat treatment process are adjusted in time.And the metallographic structure of As-extruded magnesium lithium alloy is seen
It examines by using chemical etching method, i.e., makes the metallographic group of magnesium lithium alloy using metallographic etching agent etch As-extruded magnesium lithium alloy
It knits and is shown.
In the prior art, common metallographic etching agent is mainly made of nitric acid, sulfuric acid, water, but this metallographic is rotten
The corrosivity for losing agent is stronger, and the corrosion resistance of magnesium lithium alloy is excessively poor, therefore is closed using existing metallographic etching agent etch magnesium lithium
Not only the etch time is difficult to control accurately gold, to be easy to make that metallographic structure is smudgy, is difficult to observe and analyze.
Summary of the invention
For above-mentioned shortcoming in the prior art, the present invention provides a kind of etching pits of As-extruded magnesium lithium alloy
Agent and its application method not only can be convenient the etching pit for quickly realizing As-extruded magnesium lithium alloy, but also magnesium lithium after corrosion
Alloy surface uniformity, duplex structure's crystal boundary is clear-cut complete, is convenient for the observation and analysis of metallographic structure.
The purpose of the present invention is what is be achieved through the following technical solutions:
A kind of metallographic etching agent of As-extruded magnesium lithium alloy, the hydrofluoric acid for being 40% by mass fraction, mass fraction are
The ethyl alcohol that 60% citric acid and mass fraction is 98% is uniformly mixed, and according to volume basis, the hydrofluoric acid: institute
State citric acid: the ethyl alcohol=(20~50): (10~30): (20~70).
Preferably, the volume ratio of the hydrofluoric acid and the citric acid, the ethyl alcohol is 40:20:40.
It preferably, is 6%~9% suitable for the mass fraction to lithium, and metallographic structure is by rich magnesium α phase solid solution and β
The As-extruded magnesium lithium alloy of phase solid solution composition carries out etching pit.
A kind of application method of the metallographic etching agent of As-extruded magnesium lithium alloy, for carrying out metallographic to As-extruded magnesium lithium alloy
Corrosion, the metallographic etching agent of As-extruded magnesium lithium alloy as described in the above technical scheme is drawn with plastic suction pipe, and drip to polishing
Good As-extruded magnesium lithium alloy surface carries out etching pit, and the etching pit time is 5~15s, then with clear water to erosion after
As-extruded magnesium lithium alloy is cleaned, so as to obtain complete display As-extruded magnesium lithium alloy metallographic structure photo.
As seen from the above technical solution provided by the invention, As-extruded magnesium lithium alloy provided by the embodiment of the present invention
Metallographic etching agent use mass fraction for 40% hydrofluoric acid, mass fraction be 60% citric acid and mass fraction be 98%
Ethyl alcohol mix, and the volume ratio of the hydrofluoric acid and the citric acid, the ethyl alcohol is preferably 40:20:40, thus
It can be convenient the etching pit for quickly completing As-extruded magnesium lithium alloy, and the gold of the As-extruded magnesium lithium alloy after etching pit
Phase constitution complete display the most, crystal boundary is clear and legible, this facilitates observation and analysis to metallographic structure.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill in field, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is to carry out etching pit using the metallographic etching agent of As-extruded magnesium lithium alloy described in the embodiment of the present invention 1
The metallographic structure shape appearance figure of As-extruded magnesium lithium alloy A afterwards.
Specific embodiment
With reference to the attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete
Ground description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on this
The embodiment of invention, those of ordinary skill in the art's every other implementation obtained under that premise of not paying creative labor
Example, belongs to protection scope of the present invention.
The metallographic etching agent and its application method of As-extruded magnesium lithium alloy provided by the present invention are retouched in detail below
It states.
A kind of metallographic etching agent of As-extruded magnesium lithium alloy, the hydrofluoric acid for being 40% by mass fraction, mass fraction are
The ethyl alcohol that 60% citric acid and mass fraction is 98% mixes, and the hydrofluoric acid and the citric acid, the second
The volume ratio of alcohol is (20~50): (10~30): (20~70).
Wherein, the hydrofluoric acid, the citric acid and the ethyl alcohol can use (20~50): (10~30): (20~
70) between arbitrary volume ratio (such as: the hydrofluoric acid: the citric acid: the ethyl alcohol=20:10:70,30 can be used:
The volume ratio of 30:40 or 50:25:25) mixing, this can make the As-extruded magnesium lithium alloy after etching pit crystal boundary occur, only
Metallographic structure readability is different, but in practical applications, the hydrofluoric acid and the citric acid, the ethyl alcohol volume ratio most
It is well 40:20:40, this not only can be convenient the etching pit for quickly completing As-extruded magnesium lithium alloy, but also after etching pit
As-extruded magnesium lithium alloy metallographic structure complete display the most, crystal boundary is clear and legible, this facilitates the observation to metallographic structure
And analysis.
Specifically, the metallographic etching agent of As-extruded magnesium lithium alloy provided by the present invention the preparation method is as follows: according to upper
The volume ratio of raw material is stated, first the ethyl alcohol that mass fraction is 98% is added in plastic containers, then the amount of sequentially adding score is
40% hydrofluoric acid, the citric acid that mass fraction is 60% are simultaneously uniformly mixed.
Further, the metallographic etching agent of As-extruded magnesium lithium alloy provided by the present invention is primarily adapted for use in the quality to lithium
Score is 6%~9%, and metallographic structure is carried out by the As-extruded magnesium lithium alloy that rich magnesium α phase solid solution and β phase solid solution form
Etching pit.The application method of the metallographic etching agent of the As-extruded magnesium lithium alloy is as follows: drawing the As-extruded magnesium with plastic suction pipe
The metallographic etching agent of lithium alloy, and drip to polished As-extruded magnesium lithium alloy surface and carry out etching pit, etching pit time
For 5~15s, then the As-extruded magnesium lithium alloy after erosion is cleaned with clear water, and with the cotton balls pair for being moistened with dehydrated alcohol
The surface of As-extruded magnesium lithium alloy after cleaning is wiped, then be dried (such as: its surface can be blown using hair dryer
It is dry), etching pit is carried out to As-extruded magnesium lithium alloy to can be realized, the As-extruded magnesium lithium alloy of complete display can be obtained
Metallographic structure shape appearance figure.
To sum up, the embodiment of the present invention not only can be convenient the etching pit for quickly realizing As-extruded magnesium lithium alloy,
And magnesium lithium alloy surface uniformity after corroding, duplex structure's crystal boundary is clear-cut complete, is convenient for metallographic structure
Observation and analysis.
In order to more clearly from show technical solution provided by the present invention and generated technical effect, below with tool
The metallographic etching agent of As-extruded magnesium lithium alloy provided by the present invention is described in detail in body embodiment.
Embodiment 1
A kind of metallographic etching agent of As-extruded magnesium lithium alloy, hydrofluoric acid, 20ml mass by 40ml mass fraction for 40%
The ethyl alcohol that the citric acid and 40ml mass fraction that score is 60% are 98% is uniformly mixed.
Specifically, at room temperature, As-extruded magnesium lithium alloy described in the embodiment of the present invention 1 is drawn with plastic suction pipe
Metallographic etching agent, and drip to polished As-extruded magnesium lithium alloy A surface carry out etching pit, the etching pit time be 5
Then~15s cleans the As-extruded magnesium lithium alloy A after erosion with clear water, and with being moistened with the cotton balls of dehydrated alcohol to clear
The surface of As-extruded magnesium lithium alloy A after washing is wiped, then is dried up its surface using hair dryer, to can be realized to crowded
State magnesium lithium alloy A is pressed to carry out etching pit.The metallographic structure of As-extruded magnesium lithium alloy A after etching pit can with as shown in Figure 1,
As seen from Figure 1: metallographic structure is made of the rich magnesium α phase solid solution and dark color β phase solid solution of light strip in the figure, and
And duplex structure's crystal boundary is clear-cut complete.
To sum up, the embodiment of the present invention not only can be convenient the etching pit for quickly realizing As-extruded magnesium lithium alloy,
And magnesium lithium alloy surface uniformity after corroding, duplex structure's crystal boundary is clear-cut complete, is convenient for metallographic structure
Observation and analysis.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Subject to enclosing.
Claims (2)
1. a kind of metallographic etching agent of As-extruded magnesium lithium alloy is 6%~9% suitable for the mass fraction to lithium, and metallographic
Tissue carries out etching pit by the As-extruded magnesium lithium alloy that rich magnesium α phase solid solution and β phase solid solution form, which is characterized in that by
The ethyl alcohol that the citric acid and mass fraction that hydrofluoric acid that mass fraction is 40%, mass fraction are 60% are 98% uniformly mix and
At, and the volume ratio of the hydrofluoric acid and the citric acid, the ethyl alcohol is 40:20:40.
2. a kind of application method of the metallographic etching agent of As-extruded magnesium lithium alloy, rotten for carrying out metallographic to As-extruded magnesium lithium alloy
Erosion, which is characterized in that the metallographic etching agent of As-extruded magnesium lithium alloy described in the claims 1 is drawn with plastic suction pipe, and
It drips to polished As-extruded magnesium lithium alloy surface and carries out etching pit, the etching pit time is 5~15s, then with clear water pair
As-extruded magnesium lithium alloy after erosion is cleaned, and is shone so as to obtain the metallographic structure of As-extruded magnesium lithium alloy of complete display
Piece.
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| CN201610487794.8A CN105925983B (en) | 2016-06-28 | 2016-06-28 | A kind of metallographic etching agent and its application method of As-extruded magnesium lithium alloy |
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| CN201610487794.8A CN105925983B (en) | 2016-06-28 | 2016-06-28 | A kind of metallographic etching agent and its application method of As-extruded magnesium lithium alloy |
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| CN104032303A (en) * | 2014-06-26 | 2014-09-10 | 北京石油化工学院 | Metallographic phase corrosive of pure titanium TA1 and TC4 titanium alloy |
| CN105200428A (en) * | 2014-06-26 | 2015-12-30 | 胡磊磊 | AZ61-RE magnesium alloy etchant solution |
| CN104593774B (en) * | 2015-01-26 | 2017-08-01 | 河南科技大学 | A kind of magnesium alloy metallographic structure observational technique |
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