CN106404502A - Corrosive agent for displaying grain boundaries of high-damping manganese-based copper alloys and corrosion method thereof - Google Patents
Corrosive agent for displaying grain boundaries of high-damping manganese-based copper alloys and corrosion method thereof Download PDFInfo
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Abstract
The invention relates to a corrosion method for displaying grain boundaries of high-damping manganese-based copper alloys. Metallographic corrosion is carried out for high-damping manganese-based copper alloys whose Mn content is higher than 70% and Cu content is higher than 20%, and a sample is prepared according to a conventional method; a saturated solution of picric acid and a nitric acid alcohol solution whose concentration is 5-15% are fully mixed according to a volume fraction ratio of 1 to 0.8-1 to 1.2, and the solutions are placed at a normal temperature for at least 10 minutes; a polishing surface of a sample is upward and placed in a corrosive agent, corrosion is carried out for at least 4 minutes, the corroded high-damping manganese-based copper alloy sample is taken out and washed with flowing water as well as washed with alcohol and dried, and etching is completed for displaying crystal boundaries; observation is carried out under a 100x microscope in order to obtain crystal grain displaying photographs, and a comparsion method or a grid method or a resection is used for carrying out determination of grains. The corrosive agent is used for corroding in order to obtain clear grain sizes, corrosion of matrix structures is avoided, and the problem that crystal boundary and twin crystal appear at the same time is solved; and the method has the advantages of simple operation, accurate determination, higher accuracy, and usage safety.
Description
Technical field
The present invention relates to a kind of caustic of display high-damping manganio copper alloy grain boundary and its caustic solution, belong to gold
Facies analyses technical field.
Background technology
Developing rapidly with modernization industry, noise and vibration become outstanding problem in engineering and pollution nuisance it
One.Metal damping material is a kind of structure-function integration material for vibration damping and noise reduction, manufactures coupled vibration source using it
Component, can efficiently solve the vibration in machine-building and correlation engineering field and noise problem.
The copper alloy with damping effect mainly has manganin, belongs to twin type alloy material.The machine that its damping produces
Reason is：Alloy passes through heat treatment in high temperature annealing process, produces substantial amounts of highly dense because of nile transformation and Martensite like transformation
Degree twins sub-structure, in the presence of external stress, absorbs external energy due to the movement of micro-twin circle and the deflection of magnetic moment
Amount, so that stress relaxation, plays preferable vibration damping, de-noising effect.Few, the only minority of damping copper alloy domestic development
Several alloy designations, copper-manganese damping alloy can play damping, noise reduction and the effect improving fatigue life, making vibrationproof and disappearing
Acoustic equipment aspect has important function.It is mainly used in the securing member of vibration-proof equipment, the pump housing, support, gear on decelerator etc..Its
Most typical purposes is submarine propeller.
Because high-damping manganio coppr alloy-metal is in twin type alloy material, intercrystalline exists and substantial amounts of produces height because of phase transformation
Density twins sub-structure, therefore how it is carried out with crystal grain evaluation is a metallographic difficult problem now.
Existing to high-damping manganio copper alloy grain size detection mode, a kind of be 4% using volume fraction nitre
Sour alcoholic solution, as caustic, by high-damping manganio copper alloy test block after caustic corrosion, relies on the presence of the size of a phase
To pass judgment on grain size.As shown in Figure 8, sample after being corroded with 4% nitric acid ethanol caustic, shines in 100 times of metallographics
Piece, reason in by tissue interference than more serious it is impossible to intuitively show crystal grain.Another kind is to make this using saturation picric acid solution
Caustic, through there being display grain size.As shown in Figure 9, when after the corrosion of saturation picric acid solution, damp manganio copper alloy test block
Observe and obtain crystal grain display photos at 100 times and may be seen indistinctly although crystal boundary can be examined, but cannot intuitively accurately enter
Row grain size is passed judgment on.Another is to carry out electrolysis process using oxalic acid solution, to show that the crystal grain of damping manganio copper alloy is big
Little, as shown in Figure 10, after oxalic acid solution electrolytic etching, damping manganio copper alloy test block is observed and is obtained crystal grain at 100 times and shows
Show photo although crystal boundary can clearly manifest, but seriality be bad, and a large amount of twins occur that crystal grain evaluation can be existed very
Big interference.
Therefore, demand provides a kind of caustic that can clearly indicate high-damping manganio copper alloy grain boundaries and corrosion side
Method is so that can clearly indicate high-damping manganio copper alloy grain size under an optical microscope.
Content of the invention
The purpose of the present invention is exactly to solve the above-mentioned problems in the prior art, providing a kind of display high-damping manganese
The caustic of base copper alloy grain boundary and its caustic solution.
The present invention is that the technical scheme reaching above-mentioned purpose is：A kind of corruption of display high-damping manganio copper alloy grain boundary
Erosion agent it is characterised in that：The nital being 5%～15% including saturation picric acid solution and volume fraction, and saturation
It is 1 that picric acid solution and nital press Volume fraction：0.8～1.2.
The present invention show high-damping manganio copper alloy grain boundary caustic solution it is characterised in that：Application claim 1
Described caustic carries out etching pit to the high-damping manganio copper alloy of Mn ＞ 70% and Cu ＞ 20%, comprises the steps：
(1), sample preparation：Cut high-damping manganio copper alloy sample, the horizontal face of high-damping manganio copper alloy sample is pressed
Conventional method carries out roughly grinding, fine grinding, polishing, clean, dry up, and high-damping manganio copper alloy sample is obtained；
(2), corrosive liquid proportioning：The nital of saturation picric acid solution and 5%～15% is pressed Volume fraction exist
1：After 0.8～1.1.2 is sufficiently mixed, room temperature places at least 10min；
(3), sample corrosion：The polishing of high-damping manganio copper alloy sample is faced up and is placed in caustic, through at least
After 4min corrosion, take out the high-damping manganio copper alloy sample of corrosion, rinsed with flowing water and dried up with alcohol washes, etch completes
Display of Grain Boundary；
(4), crystal grain judges：Observed with 100 times under the microscope and obtain crystal grain display photos, and adopt matching type or net
Lattice method or resection carry out crystal grain judgement；
Unrestricted only in the preparation of above-mentioned high-damping manganio copper alloy sample and corrosive liquid proportioning step, can carry out or suitable simultaneously
Sequence can adjust.
The caustic of the present invention adopts weakly acidic saturation picric acid solution and acidity higher than the 5% of saturation picric acid solution
～15% nital, and saturation picric acid solution and nital Volume fraction are controlled 1：0.8～
1.2, when high-damping manganio copper alloy is completely immersed in the caustic of the present invention, make saturation picric acid solution preferential nitric acid ethanol
Solution and with high-damping manganio copper alloy occur chemical reaction, corrode high-damping manganio copper alloy grain boundaries while, also can shape
Become the manganese oxide film of one layer of grey black, be completely covered corroding the crystal boundary because manganese oxide is in grey black, and manganese oxide film
Corrosion resistance be higher than matrix, now the corrosive nature of saturation picric acid solution just greatly reduces, and the stronger nitric acid of acidity
Alcoholic solution starts to play a role, and the manganese oxide film of grey black is removed, reaches the effect of pickling, due to nital with
Copper in high-damping manganio copper alloy hardly reacts, the high-damping manganio copper alloy specimen surface shape after making to be corroded
Become coppery, therefore take out and can examine under a microscope clearly crystal grain after drying up.Caustic of the present invention adopts specific ratio
The saturation picric acid solution of example and nital can carry out chemical reaction to high-damping manganio copper alloy specimen surface, corrosion
Go out clearly grain size, avoid corrosion structure simultaneously, and can clearly be shown high-damping manganio copper alloy grain boundaries, solve crystalline substance
Boundary and twin produced problem simultaneously, can clearly show high-damping manganio copper alloy grain size under an optical microscope.
Under room temperature of the present invention, high-damping manganio copper alloy carries out etching pit it is not necessary to heating, need not be electrolysed, economical real
Favour, and after corroding, only display crystal boundary after corrosion, do not show intergranular structure, crystal grain evaluation is not affected by twin completely, can
Clearly observe each crystal grain, crystal grain judge can be carried out using matching type, gridding method, resection etc. according to practical situation, judge accurate
Really property, accuracy are higher.
The inventive method is simple to operate, and nital concentration is relatively low, and sample and caustic are easily prepared, no
There is potential safety hazard, material consumption is few, compared to prior art, the preparation of caustic is easier, and process more simplifies, each material
It is more easy to obtain, and their consumption, precision are easier to control.
Brief description
Below in conjunction with the accompanying drawings embodiments of the invention are described in further detail.
Fig. 1 is that caustic corrosion high-damping manganio copper alloy sample Jin Jing's granularity of the embodiment of the present invention 1 preparation amplifies 100
Metallograph again.
Fig. 2 is that caustic corrosion high-damping manganio copper alloy sample Jin Jing's granularity of the embodiment of the present invention 2 preparation amplifies 100
Metallograph again.
Fig. 3 is that caustic corrosion high-damping manganio copper alloy sample Jin Jing's granularity of the embodiment of the present invention 3 preparation amplifies 100
Metallograph again.
Fig. 4 is that the corrosive high-damping manganio copper alloy sample grain size of the embodiment of the present invention 4 preparation amplifies 100
Metallograph again.
Fig. 5 is that corrosive high-damping manganio copper alloy sample Jin Jing's granularity of the embodiment of the present invention 5 preparation is amplified
100 times of metallograph.
Fig. 6 is that the caustic corrosion high-damping manganio copper alloy sample grain size of preparation in the embodiment of the present invention 6 amplifies 100
Metallograph again.
Fig. 7 is that the caustic corrosion high-damping manganio copper alloy crystalline substance sample granularity of preparation in the embodiment of the present invention 7 amplifies 100
Metallograph again.
Fig. 8 is to corrode high-damping manganio copper alloy sample grain size using 4% nitric acid ethanol caustic in prior art to put
Big 100 times of metallograph.
Fig. 9 is to adopt saturation picric acid caustic corrosion high-damping manganio copper alloy sample grain size to amplify in prior art
100 times of metallograph.
Figure 10 is to adopt oxalic acid electrolytic etching high-damping manganio copper alloy sample grain size to amplify 100 times in prior art
Metallograph.
Specific embodiment
The present invention shows the caustic of high-damping manganio copper alloy grain boundary, including saturation picric acid solution and volume integral
The nital for 5%～15% for the number, and saturation picric acid solution presses Volume fraction for 1 with nital：0.8
～1.2.
The present inventor is led to substantial amounts of experiment and is found, corrosive liquid of the present invention adopts weakly acidic saturation picric acid solution and acidity
Higher than the peculiar formula system of the 5%～15% of saturation picric acid solution nital, in the examination of high-damping manganio copper alloy
After sample surface is completely immersed in caustic, the saturation picric acid solution of weak acid is made first to occur chemistry anti-with high-damping manganio copper alloy
Should, while corroding high-damping manganio copper alloy grain boundaries, also can form the manganese oxide film of one layer of grey black, because manganese oxide is in
Grey black, and can be completely covered corroding the crystal boundary, and the corrosion resistance of manganese oxide film is higher than matrix, makes saturation picric acid
The corrosive nature of solution just greatly reduces, and plays an only corrosion crystal boundary, and the effect of not corrosion structure, a large amount of due to producing
Twin, solves crystal boundary and twin produced problem simultaneously.And the stronger nital of acidity is by the manganese oxide of grey black
Film removes, and plays the effect of pickling, and nital and the copper in high-damping manganio copper alloy hardly react,
So the specimen surface after being corroded forms coppery, take out and can examine under a microscope clearly crystal grain after drying up, this
Invention, by two kinds of different acid solution and through peculiar formula system, controls two kinds of solution different response time, can ensure that
High-damping manganio copper alloy grain size can clearly be shown under an optical microscope.
The present invention shows the caustic of high-damping manganio copper alloy grain boundary, its saturation picric acid solution and 5%～
The Volume fraction of 15% nital is 1：0.9～1.1.
The present invention be preferably saturation picric acid solution and 5%～15% nital Volume fraction 1：1.
And the nital of caustic is nital that volume fraction is 10%.
The present invention shows the caustic solution of high-damping manganio copper alloy grain boundary, using above-mentioned caustic to Mn ＞
The high-damping manganio copper alloy of 70% and Cu ＞ 20% carries out etching pit, comprises the steps：
(1), sample preparation：Cut high-damping manganio copper alloy sample, the horizontal face of high-damping manganio copper alloy sample is pressed
Conventional method carries out roughly grinding, fine grinding, polishing, clean, dry up, and high-damping manganio copper alloy sample is obtained.
(2), corrosive liquid proportioning：The nital of saturation picric acid solution and 5%～15% is pressed Volume fraction exist
1：After 0.8～1.1.2 is sufficiently mixed, room temperature places at least 10min.
(3), sample corrosion：The polishing of high-damping manganio copper alloy sample is faced up and is placed in caustic, through at least
After 4min corrosion, take out the high-damping manganio copper alloy sample after corrosion, rinsed with flowing water and dried up with alcohol washes, etch is complete
Become Display of Grain Boundary.It was observed that high-damping manganio copper after high-damping manganio copper alloy sample of the present invention corrodes 4min in caustic
The erosional surface of alloy sample becomes corrosion during coppery completely and terminates.
(4), crystal grain judges：Observed with 100 times under the microscope and obtain crystal grain display photos, and adopt matching type or net
Lattice method or resection carry out crystal grain judgement.
Unrestricted only in the preparation of above-mentioned high-damping manganio copper alloy sample and corrosive liquid proportioning step, can carry out or suitable simultaneously
Sequence can adjust.
The present invention in above-mentioned corrosive liquid proportioning, by the nital of saturation picric acid solution and 5%～15%
Volume fraction presses 1：0.9～1.1 is sufficiently mixed, and places at least 10min under room temperature.As corrosive liquid adopts saturation picric acid solution
Press 1 with the Volume fraction of 5% nital：0.9 is sufficiently mixed, or corrosive liquid adopt saturation picric acid solution with
The Volume fraction of 10% nital presses 1：0.9 is sufficiently mixed, or corrosive liquid adopt saturation picric acid solution with
The Volume fraction of 15% nital presses 1：0.9 is sufficiently mixed；Can also be corrosive liquid and adopt saturation picric acid solution
Press 1 with the Volume fraction of 5% nital：0.95 is sufficiently mixed, or corrosive liquid adopt saturation picric acid solution with
The Volume fraction of 10% nital presses 1：0.95 is sufficiently mixed, or corrosive liquid adopt saturation picric acid solution with
The Volume fraction of 15% nital presses 1：0.95 is sufficiently mixed, and can also be corrosive liquid and adopts saturation picric acid solution
Press 1 with the Volume fraction of 5% nital：1.05 being sufficiently mixed；Or corrosive liquid adopt saturation picric acid solution with
The Volume fraction of 10% nital presses 1：1.05 are sufficiently mixed, or corrosive liquid adopt saturation picric acid solution with
The Volume fraction of 15% nital presses 1：1.05 being sufficiently mixed.
The present invention also can be in corrosive liquid proportioning, by the nital of saturation picric acid solution and 5%～15%
Volume fraction presses 1：1 is sufficiently mixed, and places at least 10min under room temperature, as corrosive liquid adopts saturation picric acid solution and 5%
The Volume fraction of nital presses 1：1 is sufficiently mixed, or molten with 10% nitric acid ethanol using saturation picric acid solution
The Volume fraction of liquid presses 1：1 is sufficiently mixed；Or corrosive liquid adopts saturation picric acid solution and 10% nital
Volume fraction presses 1：1 is sufficiently mixed, or corrosive liquid is using the volume of saturation picric acid solution and 15% nital
Score ratio presses 1：1 is sufficiently mixed.
The inventors discovered that after corrosive liquid exceeds said ratio, the high-damping manganio copper alloy sample Jin Jing after being corroded
Boundary is inconspicuous, can organize etched the matrix, and substantial amounts of twin, can be subject to tissue effect, be unable to clearly observe each crystalline substance
Grain, and affect to judge.
The present invention adopt high-damping manganio copper alloy sample main chemical be Mn74.15%, Cu25.38%,
Fe0.055%, Si0.023%, C0.047%, S0.041%, P0.004%, with the corrosive liquid of the present invention to high-damping manganio copper
Alloy is corroded as sample, is specifically shown in following examples.
Embodiment 1：
The present invention shows that the caustic of high-damping manganio copper alloy grain boundary includes saturation picric acid and nitric acid ethanol is molten
Liquid, by Volume fraction, saturation picric acid solution and 15% nital are 1：0.8, room temperature after stirring
Place 11 minutes.During using this caustic corrosion high-damping manganio copper alloy grain boundary, height is obtained according to conventional method of preparing sample
After damping manganio copper alloy sample, the burnishing surface of high-damping manganio copper alloy sample is immersed in caustic fully up, room temperature
It was observed that the erosional surface of high-damping manganio copper alloy sample becomes during coppery corrosion completely terminates after placing 5 minutes, take out rotten
High-damping manganio copper alloy sample after erosion, after circulating water rinses, spray dehydrated alcohol air-dries, and is observed with 100 times under the microscope,
Result is as shown in Figure 1.
Embodiment 2：
The present invention shows that the caustic of high-damping manganio copper alloy grain boundary includes saturation picric acid solution and nitric acid wine
Smart solution, by Volume fraction, saturation picric acid solution and 5% nital are 1：0.9, through stirring rear chamber
Temperature is placed 12 minutes.During using this caustic corrosion high-damping manganio copper alloy grain boundary, it is obtained according to conventional method of preparing sample
After high-damping manganio copper alloy sample, the burnishing surface of high-damping manganio copper alloy sample is immersed in caustic fully up, room
It was observed that the erosional surface of high-damping manganio copper alloy sample becomes during coppery corrosion completely terminates after temperature is placed 4 minutes, take out
High-damping manganio copper alloy sample after corrosion, after circulating water rinses, spray dehydrated alcohol air-dries, and is seen with 100 times under the microscope
Examine, result is as shown in Figure 2.
Embodiment 3
The present invention shows that the caustic of high-damping manganio copper alloy grain boundary includes saturation picric acid solution and nitric acid wine
Smart solution, by Volume fraction, saturation picric acid solution and 10% nital are according to 1：1, stir rear chamber
Temperature is placed 11 minutes.During using this caustic corrosion high-damping manganio copper alloy grain boundary, it is obtained according to conventional method of preparing sample
After high-damping manganio copper alloy sample, the burnishing surface of high-damping manganio copper alloy sample is immersed in caustic fully up, room
It was observed that the erosional surface of high-damping manganio copper alloy sample becomes during coppery corrosion completely terminates after temperature is placed 5 minutes, take out
High-damping manganio copper alloy sample after corrosion, after circulating water rinses, spray dehydrated alcohol air-dries, and is seen with 100 times under the microscope
Examine, result is as shown in Figure 3.
Embodiment 4：
The present invention shows that the caustic of high-damping manganio copper alloy grain boundary includes saturation picric acid solution and nitric acid wine
Smart solution, by Volume fraction, saturation picric acid solution and 5% nital are according to 1：1, stir rear room temperature
Place 10 minutes.During using this caustic corrosion high-damping manganio copper alloy grain boundary, height is obtained according to conventional method of preparing sample
After damping manganio copper alloy sample, the burnishing surface of high-damping manganio copper alloy sample is immersed in caustic fully up, room temperature
It was observed that the erosional surface of high-damping manganio copper alloy sample becomes during coppery corrosion completely terminates after placing 5 minutes, take out rotten
High-damping manganio copper alloy sample after erosion, after circulating water rinses, spray dehydrated alcohol air-dries, and is observed with 100 times under the microscope,
Result is as shown in Figure 4.
Embodiment 5
The present invention shows that the caustic of high-damping manganio copper alloy grain boundary includes saturation picric acid solution and nitric acid wine
Smart solution, by Volume fraction, saturation picric acid solution and 15% nital are according to 1：1, stir rear chamber
Temperature is placed 10 minutes.During using this caustic corrosion high-damping manganio copper alloy grain boundary, it is obtained according to conventional method of preparing sample
After high-damping manganio copper alloy sample, the burnishing surface of high-damping manganio copper alloy sample is immersed in caustic fully up, room
It was observed that the erosional surface of high-damping manganio copper alloy sample becomes during coppery corrosion completely terminates after temperature is placed 5 minutes, take out
High-damping manganio copper alloy sample after corrosion, after circulating water rinses, spray dehydrated alcohol air-dries, and is seen with 100 times under the microscope
Examine, result is as shown in Figure 5.
Embodiment 6：
The present invention shows that the caustic of high-damping manganio copper alloy grain boundary includes saturation picric acid solution and nitric acid wine
Smart solution, by Volume fraction, saturation picric acid solution and 15% nital are according to 1：1.1, after stirring
Room temperature is placed 10 minutes.During using this caustic corrosion high-damping manganio copper alloy grain boundary, according to conventional method of preparing sample system
After obtaining high-damping manganio copper alloy sample, the burnishing surface of high-damping manganio copper alloy sample is immersed in caustic fully up,
It was observed that the erosional surface of high-damping manganio copper alloy sample becomes during coppery corrosion completely terminates after room temperature is placed 5 minutes, take
Go out the high-damping manganio copper alloy sample after corrosion, after circulating water rinses, spray dehydrated alcohol air-dries, under the microscope with 100 times
Observe, result is as shown in Figure 6.
Embodiment 7：
The present invention shows that the caustic of high-damping manganio copper alloy grain boundary includes saturation picric acid solution and nitric acid wine
Smart solution, by Volume fraction, saturation picric acid solution and 10% nital are according to 1：1.2, after stirring
Room temperature is placed 11 minutes.During using this caustic corrosion high-damping manganio copper alloy grain boundary, according to conventional method of preparing sample system
After obtaining high-damping manganio copper alloy sample, the burnishing surface of high-damping manganio copper alloy sample is immersed in caustic fully up,
It was observed that the erosional surface of high-damping manganio copper alloy sample becomes during coppery corrosion completely terminates after room temperature is placed 6 minutes, take
Go out the high-damping manganio copper alloy sample after corrosion, after circulating water rinses, spray dehydrated alcohol air-dries, under the microscope with 100 times
Observe, result is as shown in Figure 7.
By contrast it is found that the high-damping manganio copper alloy grain boundaries of Fig. 1～Fig. 7 substantially, are not subject to tissue effect completely,
Each crystal grain can clearly be observed, crystal grain judge can be carried out using matching type, gridding method, resection etc. according to practical situation.
Claims (8)
1. a kind of display high-damping manganio copper alloy grain boundary caustic it is characterised in that：Including saturation picric acid solution
The nital being 5%～15% with volume fraction, and saturation picric acid solution presses volume fraction with nital
Than for 1：0.8～1.2.
2. according to claim 1 display high-damping manganio copper alloy grain boundary caustic it is characterised in that：Described
Saturation picric acid solution and 5%～15% nital Volume fraction 1：0.9～1.1.
3. according to claim 1 display high-damping manganio copper alloy grain boundary caustic it is characterised in that：Described
Saturation picric acid solution and 5%～15% nital Volume fraction 1：1.
4. the caustic of the display high-damping manganio copper alloy grain boundary according to one of claims 1 to 3, its feature exists
In：Described nital is the nital that volume fraction is 10%.
5. a kind of display high-damping manganio copper alloy grain boundary caustic solution it is characterised in that：Described in application claim 1
Caustic etching pit is carried out to the high-damping manganio copper alloy of Mn ＞ 70% and Cu ＞ 20%, comprise the steps：
(1), sample preparation：Cut high-damping manganio copper alloy sample, to the horizontal face of high-damping manganio copper alloy sample routinely
Method carries out roughly grinding, fine grinding, polishing, clean, dry up, and high-damping manganio copper alloy sample is obtained；
(2), corrosive liquid proportioning：The nital of saturation picric acid solution and 5%～15% is pressed Volume fraction 1：
After 0.8～1.1.2 is sufficiently mixed, room temperature places at least 10min；
(3), sample corrosion：The polishing of high-damping manganio copper alloy sample is faced up and is placed in caustic, through at least 4min
After corrosion, take out the high-damping manganio copper alloy sample after corrosion, rinsed with flowing water and dried up with alcohol washes, etch completes crystalline substance
Boundary shows；
(4), crystal grain judges：Observed with 100 times under the microscope and obtain crystal grain display photos, and adopt matching type or gridding method
Or resection carries out crystal grain judgement；
Unrestricted only in the preparation of above-mentioned high-damping manganio copper alloy sample and corrosive liquid proportioning step, can carry out simultaneously or order can
To adjust.
6. according to claim 5 display high-damping manganio copper alloy grain boundary caustic solution it is characterised in that：Rotten
During erosion liquid proportioning, the Volume fraction of saturation picric acid solution and 5%～15% nital is pressed 1：0.8～1.2
It is sufficiently mixed, under room temperature, place at least 10min.
7. according to claim 5 display high-damping manganio copper alloy grain boundary caustic solution it is characterised in that：Rotten
During erosion liquid proportioning, the Volume fraction of saturation picric acid solution and 5%～15% nital is pressed 1：0.9～1.1
It is sufficiently mixed, under room temperature, place at least 10min.
8. according to claim 5 display high-damping manganio copper alloy grain boundary caustic solution it is characterised in that：Institute
State after high-damping manganio copper alloy sample corrodes 4min in caustic it was observed that the erosional surface of high-damping manganio copper alloy sample
Become corrosion during coppery completely to terminate.
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| CN106706402A (en) * | 2017-03-08 | 2017-05-24 | 北京科技大学 | Method for eroding as-cast Fe-Mn-C-Al system TWIP steel metallographic specimen |
| CN108774733A (en) * | 2018-05-11 | 2018-11-09 | 威尔斯新材料（太仓）有限公司 | C55E spring steel ball annealings etchant solution, solution manufacturing method and application method |
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| CN111206248A (en) * | 2020-01-16 | 2020-05-29 | 中国第一汽车股份有限公司 | Preparation and corrosion method of corrosive agent for displaying original austenite grain size of 42CrMo forge piece |
| CN113155582A (en) * | 2021-05-13 | 2021-07-23 | 攀钢集团江油长城特殊钢有限公司 | Combined corrosion method for removing twin crystal boundary |
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