CN105018932A - Ni80Cr20 alloy rolled plate metallographic corrosive liquid and preparation method and use method thereof - Google Patents
Ni80Cr20 alloy rolled plate metallographic corrosive liquid and preparation method and use method thereof Download PDFInfo
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- CN105018932A CN105018932A CN201510440607.6A CN201510440607A CN105018932A CN 105018932 A CN105018932 A CN 105018932A CN 201510440607 A CN201510440607 A CN 201510440607A CN 105018932 A CN105018932 A CN 105018932A
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Abstract
The invention discloses Ni80Cr20 alloy rolled plate metallographic corrosive liquid and a preparation method and use method thereof. The corrosive liquid comprises concentrated hydrochloric acid, glacial acetic acid, water and copper sulfate, wherein the ratio of the concentrated hydrochloric acid, the glacial acetic acid, the water and the copper sulfate is 24-26 mL to 4-6 mL to 29-31 mL to 4-5 g. By means of the Ni80Cr20 alloy rolled plate metallographic corrosive liquid, the metallographic structure of a Ni80Cr20 alloy rolled plate can be quickly and efficiently obtained in a corrosive mode, the corrosive effect is good, the metallographic structure of a researched product can be observed, after the Ni80Cr20 alloy rolled plate is corroded, the metallographic structure and the crystal boundary are very clear, and crystalline grain display is complete. The requirements of production enterprises for developing new products and observing new product structures can be met. The grain size of the Ni80Cr20 alloy rolled plate is conveniently and accurately measured through a metallographic microscope, process parameters of the rolling procedure are adjusted and optimized by measuring the grain size, and product quality of the developed products is mastered and improved.
Description
Technical field
The present invention relates to a kind of metallographic etchant, be specifically related to a kind of Ni80Cr20 alloy rolled sheet metallographic etchant and compound method thereof and using method.
Background technology
From the data display can found at present, the data of Ni80Cr20 microstructure of the alloy corrosive fluid is considerably less, even if some relevant Ni80Cr20 microstructure of the alloy corrosive fluid data can be found, but do not mark the metallographic etchant of worked structure or the metallographic etchant of cast structure yet, nichrome as cast condition metallographic etchant, can not erode away nichrome worked structure metallographic structure.Because the alloy grain after processing is less, dense structure is even, and erosion resistance is very good, so need the corrosive fluid of worked structure just can erode away metallographic structure.The metallographic etchant of the as cast condition nichrome eroded away according to bedding-in carries out Ni80Cr20 alloy rolled sheet etching pit, etching time is long, and basic corrosion does not go out metallographic structure, utilize chloroazotic acid also can not corrode metallographic structure, be thus badly in need of developing rolling state Ni80Cr20 sheet alloy metallographic etchant and carry out etching pit.
It is that manufacturing enterprise judges and production control quality in process of production that metallographic detects, and improving product quality, analyzes the quality problems occurred in production process simultaneously, by changing production technique and Optimizing Process Parameters.And etching pit is the top priority that metallographic detects, only erode away metallographic structure clearly and crystal boundary, just can carry out grain fineness number and metallographic structure and each contained containing quantitative analysis mutually, could judge whether crystal grain is excessive, whether there is the problems such as burning.
Summary of the invention
The object of the invention is to solve the technical problem existed in prior art, providing a kind of and rapidly and efficiently can erode away the Ni80Cr20 alloy rolled sheet metallographic etchant of metallographic structure for rolling state Ni80Cr20 sheet alloy.
Another object of the present invention is to provide a kind of compound method and using method of Ni80Cr20 alloy rolled sheet metallographic etchant.
In order to achieve the above object, the present invention is by the following technical solutions: a kind of Ni80Cr20 alloy rolled sheet metallographic etchant, composed of the following components: concentrated hydrochloric acid, glacial acetic acid, water, copper sulfate, the proportioning of these four kinds of compositions is concentrated hydrochloric acid: glacial acetic acid: water: copper sulfate equals 24-26 mL:4-6 mL:29-31mL:4-5g.
Further, the proportioning of these four kinds of compositions is concentrated hydrochloric acid: glacial acetic acid: water: copper sulfate equals 25 mL:5mL:30mL:4.5g.
Further, described concentrated hydrochloric acid is analytical pure, and massfraction is 36%-38%.
Further, described glacial acetic acid is analytical pure, and massfraction is 99.5%.
A kind of compound method of Ni80Cr20 alloy rolled sheet metallographic etchant, the method comprises the following steps: first take copper sulfate and pour in beaker, measuring water again pours in this beaker, measuring glacial acetic acid again pours in this beaker, measuring concentrated hydrochloric acid again pours in this beaker, utilize glass stick to stir, until copper sulfate melts completely, leave standstill at least 10 minutes.
A using method for Ni80Cr20 alloy rolled sheet metallographic etchant, the method comprises the following steps:
A, Ni80Cr20 alloy rolled sheet to be sampled, and be cut into metallographic specimen with cutting machine;
B, mounting press is utilized to carry out edge sample to metallographic specimen;
C, varigrained metallographic waterproof abrasive paper is utilized to grind metallographic specimen;
D, on polishing machine, diamond paste is utilized to carry out grinding and polishing to metallographic specimen;
E, to metallographic specimen surface water rinse after again to metallographic specimen surface alcohol rinse;
F, metallographic specimen is put into the Ni80Cr20 alloy rolled sheet metallographic etchant prepared, corrosive fluid soaks metallographic specimen surface completely, and etching time is 3-8 minute;
G, utilize distilled water to corrosion after metallographic specimen surface rinse after use again alcohol rinse metallographic specimen surface;
H, with blower, metallographic specimen is dried up after utilize opticmicroscope to carry out metallographic structure observation.
Further, the metallographic specimen of 10X10X6mm is cut in described steps A with cutting machine.
Further, utilize 400 orders, 800 orders, 1000 orders, 1500 orders in described step C, 2000 order metallographic waterproof abrasive papers carry out metallographic grinding to metallographic specimen.
Further, on polishing machine, utilize 3 micron diamond lapping paste to carry out grinding and polishing to metallographic specimen in described step D, grinding and polishing observe after 2 minutes metallographic specimen surface bright cunning and without any cut time, change clean polishing cloth, with distilled water as lubricant, polishing 1 minute.
Concentrated hydrochloric acid in corrosive fluid of the present invention dissolves nickel, chromium, manganese, titanium elements; Glacial acetic acid dissolved aluminum element; Copper sulfate plays solvency effect.Mechanism of corrosion of the present invention is: Ni80Gr20 alloy is single phase austenite tissue, and the corrosion of pure metal or single-phased alloy is the process of a chemical dissolution.Because on crystal boundary, atomic arrangement is irregular, there is higher free energy, so crystal boundary corrosion-vulnerable and in chase, make tissue show, polygonal crystal grain can be seen under the microscope.If corrosion is comparatively dark, then because each crystal grain position is to difference, different crystal face dissolution rate is different, and the micro-plane after corrosion is different from the angle of former flour milling, and under vertical irradiate light, the light that reflection enters object lens is different, can see the crystal grain that light and shade is different.
Hinge structure of the present invention has following beneficial effect: Ni80Cr20 alloy rolled sheet metallographic etchant of the present invention can erode away the metallographic structure of rolling state Ni80Cr20 sheet alloy quickly and efficiently, corrosive effect is good, the metallographic structure of research and development product is observed, after the corrosion of rolling state Ni80Cr20 sheet alloy, metallurgical structure and crystal boundary are very clear, crystal grain display is complete, manufacturing enterprise can be met develop new product and observe product innovation weave construction, be convenient to utilize metaloscope to measure its grain fineness number accurately, and carry out by the measurement of grain fineness number the processing parameter adjusting and optimize rolling process, grasp and promote the quality product of development.The present invention makes researcher and the manufacturing enterprise weave construction to research and development and production product Ni80Cr20 alloy rolled sheet observe and measure, judge whether product meets enterprise and produce and customer requirement, improved the quality of products and product lumber recovery by adjusting process parameter, to reduce the number of rejects and seconds rate, improve the profit margin of enterprise's finished product and semi-finished product, very objectively economic benefit can be brought for scientific research and production.
Accompanying drawing explanation
Fig. 1 is the rear metallurgical structure figure of Ni80Cr20 alloy rolled sheet corrosion in the embodiment of the present invention 1;
Fig. 2 is the rear metallurgical structure figure of Ni80Cr20 alloy rolled sheet corrosion in the embodiment of the present invention 2;
Fig. 3 is the rear metallurgical structure figure of Ni80Cr20 alloy rolled sheet corrosion in the embodiment of the present invention 3.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Embodiment 1
A kind of Ni80Cr20 alloy rolled sheet metallographic etchant, be made up of the component of following content: concentrated hydrochloric acid 25mL, glacial acetic acid 5 mL, water 30 mL, copper sulfate 4.5g, wherein concentrated hydrochloric acid is analytical pure, and massfraction is 36%-38%; Glacial acetic acid is analytical pure, and massfraction is 99.5%.
When preparing this Ni80Cr20 alloy rolled sheet metallographic etchant, first taking 4.5g copper sulfate pours in 100 mL beakers, measuring 30 mL water again pours in this beaker, measuring 5 mL glacial acetic acids again pours in this beaker, measuring 25mL concentrated hydrochloric acid again pours in this beaker, utilize glass stick to stir, until copper sulfate melts completely, leave standstill at least 10 minutes.
When using this Ni80Cr20 alloy rolled sheet metallographic etchant, first the Ni80Cr20 alloy rolled sheet that certain enterprise produces is sampled, and be cut into the metallographic specimen of 10X10X6mm with cutting machine; Then mounting press is utilized to carry out edge sample to metallographic specimen; Utilize 400 orders, 800 orders, 1000 orders, 1500 orders, 2000 order metallographic waterproof abrasive papers carry out metallographic grinding to metallographic specimen; Then on polishing machine, utilize 3 micron diamond lapping paste to carry out grinding and polishing to metallographic specimen, grinding and polishing observe after 2 minutes metallographic specimen surface bright cunning and without any cut time, change clean polishing cloth, with distilled water as lubricant, polishing 1 minute; With water to after metallographic specimen surface washing again with alcohol to metallographic specimen surface washing; Metallographic specimen is put into watch-glass, metallographic specimen surface is dropped in after sucking with plastic dropper the Ni80Cr20 alloy rolled sheet metallographic etchant prepared, corrosive fluid is made to soak metallographic specimen surface completely, timing is carried out with manual time-keeping device, after etching time reaches 4 minutes, metallographic specimen is held out under the arm with agrafe, first with distilled water, flushing 1-2 minute is carried out to the metallographic specimen surface after corrosion, absorbent cotton wiping metallographic specimen surface again with band alcohol after the residual acid of specimen surface and salt ion are rinsed well, then utilizes alcohol rinse metallographic specimen surface; Opticmicroscope is utilized to carry out metallographic structure observation after the alcohol of metallographic specimen dries up by recycling blower.As can be seen from Figure 1: this Ni80Cr20 alloy rolled sheet metallographic etchant corrosive effect is very good, metallographic specimen is corroded with it, the weave construction of metallographic specimen and crystal boundary are very clear, and crystal grain display is complete, is convenient to utilize metaloscope to measure its grain fineness number accurately.
Embodiment 2
A kind of Ni80Cr20 alloy rolled sheet metallographic etchant, be made up of the component of following content: concentrated hydrochloric acid 24mL, glacial acetic acid 6 mL, water 31 mL, copper sulfate 5g, wherein concentrated hydrochloric acid is analytical pure, and massfraction is 36%-38%; Glacial acetic acid is analytical pure, and massfraction is 99.5%.
When preparing this Ni80Cr20 alloy rolled sheet metallographic etchant, first taking 5g copper sulfate pours in 100 mL beakers, measuring 31mL water again pours in this beaker, measuring 6 mL glacial acetic acids again pours in this beaker, measuring 24mL concentrated hydrochloric acid again pours in this beaker, utilize glass stick to stir, until copper sulfate melts completely, leave standstill at least 10 minutes.
When using this Ni80Cr20 alloy rolled sheet metallographic etchant, first the Ni80Cr20 alloy rolled sheet that certain enterprise produces is sampled, and be cut into the metallographic specimen of 10X10X6mm with cutting machine; Then mounting press is utilized to carry out edge sample to metallographic specimen; Utilize 400 orders, 800 orders, 1000 orders, 1500 orders, 2000 order metallographic waterproof abrasive papers carry out metallographic grinding to metallographic specimen; Then on polishing machine, utilize 3 micron diamond lapping paste to carry out grinding and polishing to metallographic specimen, grinding and polishing observe after 2 minutes metallographic specimen surface bright cunning and without any cut time, change clean polishing cloth, with distilled water as lubricant, polishing 1 minute; With water to after metallographic specimen surface washing again with alcohol to metallographic specimen surface washing; Metallographic specimen is put into watch-glass, metallographic specimen surface is dropped in after sucking with plastic dropper the Ni80Cr20 alloy rolled sheet metallographic etchant prepared, corrosive fluid is made to soak metallographic specimen surface completely, timing is carried out with manual time-keeping device, after etching time reaches 3 minutes, metallographic specimen is held out under the arm with agrafe, first with distilled water, flushing 1-2 minute is carried out to the metallographic specimen surface after corrosion, absorbent cotton wiping metallographic specimen surface again with band alcohol after the residual acid of specimen surface and salt ion are rinsed well, then utilizes alcohol rinse metallographic specimen surface; Opticmicroscope is utilized to carry out metallographic structure observation after the alcohol of metallographic specimen dries up by recycling blower.As can be seen from Figure 2: this Ni80Cr20 alloy rolled sheet metallographic etchant corrosive effect is good, and corrode metallographic specimen with it, weave construction and the crystal boundary of metallographic specimen are clear, crystal grain display is complete, is convenient to utilize metaloscope to measure its grain fineness number accurately.
Embodiment 3
A kind of Ni80Cr20 alloy rolled sheet metallographic etchant, be made up of the component of following content: concentrated hydrochloric acid 26mL, glacial acetic acid 4 mL, water 29 mL, copper sulfate 4g, wherein concentrated hydrochloric acid is analytical pure, and massfraction is 36%-38%; Glacial acetic acid is analytical pure, and massfraction is 99.5%.
When preparing this Ni80Cr20 alloy rolled sheet metallographic etchant, first taking 4g copper sulfate pours in 100 mL beakers, measuring 29mL water again pours in this beaker, measuring 4mL glacial acetic acid again pours in this beaker, measuring 26mL concentrated hydrochloric acid again pours in this beaker, utilize glass stick to stir, until copper sulfate melts completely, leave standstill at least 10 minutes.
When using this Ni80Cr20 alloy rolled sheet metallographic etchant, first the Ni80Cr20 alloy rolled sheet that certain enterprise produces is sampled, and be cut into the metallographic specimen of 10X10X6mm with cutting machine; Then mounting press is utilized to carry out edge sample to metallographic specimen; Utilize 400 orders, 800 orders, 1000 orders, 1500 orders, 2000 order metallographic waterproof abrasive papers carry out metallographic grinding to metallographic specimen; Then on polishing machine, utilize 3 micron diamond lapping paste to carry out grinding and polishing to metallographic specimen, grinding and polishing observe after 2 minutes metallographic specimen surface bright cunning and without any cut time, change clean polishing cloth, with distilled water as lubricant, polishing 1 minute; With water to after metallographic specimen surface washing again with alcohol to metallographic specimen surface washing; Metallographic specimen is put into watch-glass, metallographic specimen surface is dropped in after sucking with plastic dropper the Ni80Cr20 alloy rolled sheet metallographic etchant prepared, corrosive fluid is made to soak metallographic specimen surface completely, timing is carried out with manual time-keeping device, after etching time reaches 8 minutes, metallographic specimen is held out under the arm with agrafe, first with distilled water, flushing 1-2 minute is carried out to the metallographic specimen surface after corrosion, absorbent cotton wiping metallographic specimen surface again with band alcohol after the residual acid of specimen surface and salt ion are rinsed well, then utilizes alcohol rinse metallographic specimen surface; Opticmicroscope is utilized to carry out metallographic structure observation after the alcohol of metallographic specimen dries up by recycling blower.As can be seen from Figure 3: this Ni80Cr20 alloy rolled sheet metallographic etchant corrosive effect is good, and corrode metallographic specimen with it, weave construction and the crystal boundary of metallographic specimen are clear, crystal grain display is complete, is convenient to utilize metaloscope to measure its grain fineness number accurately.
Claims (9)
1. a Ni80Cr20 alloy rolled sheet metallographic etchant, it is characterized in that: it is composed of the following components: concentrated hydrochloric acid, glacial acetic acid, water, copper sulfate, the proportioning of these four kinds of compositions is concentrated hydrochloric acid: glacial acetic acid: water: copper sulfate equals 24-26 mL:4-6 mL:29-31mL:4-5g.
2. a kind of Ni80Cr20 alloy rolled sheet metallographic etchant according to claim 1, is characterized in that: the proportioning of these four kinds of compositions is concentrated hydrochloric acid: glacial acetic acid: water: copper sulfate equals 25 mL:5mL:30mL:4.5g.
3. a kind of Ni80Cr20 alloy rolled sheet metallographic etchant according to claim 1 and 2, it is characterized in that: described concentrated hydrochloric acid is analytical pure, massfraction is 36%-38%.
4. a kind of Ni80Cr20 alloy rolled sheet metallographic etchant according to claim 1 and 2, it is characterized in that: described glacial acetic acid is analytical pure, massfraction is 99.5%.
5. the compound method of a Ni80Cr20 alloy rolled sheet metallographic etchant, it is characterized in that the method comprises the following steps: first take copper sulfate and pour in beaker, measuring water again pours in this beaker, measuring glacial acetic acid again pours in this beaker, measuring concentrated hydrochloric acid again pours in this beaker, utilize glass stick to stir, until copper sulfate melts completely, leave standstill at least 10 minutes.
6. a using method for Ni80Cr20 alloy rolled sheet metallographic etchant, is characterized in that the method comprises the following steps:
A, Ni80Cr20 alloy rolled sheet to be sampled, and be cut into metallographic specimen with cutting machine;
B, mounting press is utilized to carry out edge sample to metallographic specimen;
C, varigrained metallographic waterproof abrasive paper is utilized to grind metallographic specimen;
D, on polishing machine, diamond paste is utilized to carry out grinding and polishing to metallographic specimen;
E, to metallographic specimen surface water rinse after again to metallographic specimen surface alcohol rinse;
F, metallographic specimen is put into the Ni80Cr20 alloy rolled sheet metallographic etchant prepared, corrosive fluid soaks metallographic specimen surface completely, and etching time is 3-8 minute;
G, utilize distilled water to corrosion after metallographic specimen surface rinse after use again alcohol rinse metallographic specimen surface;
H, with blower, metallographic specimen is dried up after utilize opticmicroscope to carry out metallographic structure observation.
7. the using method of a kind of Ni80Cr20 alloy rolled sheet metallographic etchant according to claim 6, is characterized in that: the metallographic specimen being cut into 10X10X6mm in described steps A with cutting machine.
8. the using method of a kind of Ni80Cr20 alloy rolled sheet metallographic etchant according to claim 6, is characterized in that: utilize 400 orders, 800 orders, 1000 orders, 1500 orders in described step C, 2000 order metallographic waterproof abrasive papers carry out metallographic grinding to metallographic specimen.
9. the using method of a kind of Ni80Cr20 alloy rolled sheet metallographic etchant according to claim 6, it is characterized in that: on polishing machine, in described step D, utilize 3 micron diamond lapping paste to carry out grinding and polishing to metallographic specimen, grinding and polishing observe after 2 minutes metallographic specimen surface bright cunning and without any cut time, change clean polishing cloth, with distilled water as lubricant, polishing 1 minute.
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| CN105780005A (en) * | 2016-04-13 | 2016-07-20 | 太原理工大学 | Cold corrosion agent for displaying dendritic structure of 800 H nickel base corrosion resistant alloy and corrosion method |
| CN107843592A (en) * | 2017-10-11 | 2018-03-27 | 河钢股份有限公司 | A kind of austenitic stainless steel weld joint tissue corrosive agent and its application method |
| CN109468640A (en) * | 2018-11-26 | 2019-03-15 | 抚顺特殊钢股份有限公司 | A kind of SNCrW stainless steel metallographic etchant and its preparation method and application method |
| CN109540634A (en) * | 2018-11-20 | 2019-03-29 | 中国航发贵州黎阳航空动力有限公司 | A kind of detection method for GH4648 sheet coupon crystal grain and microscopic structure |
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Cited By (5)
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| CN109540634A (en) * | 2018-11-20 | 2019-03-29 | 中国航发贵州黎阳航空动力有限公司 | A kind of detection method for GH4648 sheet coupon crystal grain and microscopic structure |
| CN109468640A (en) * | 2018-11-26 | 2019-03-15 | 抚顺特殊钢股份有限公司 | A kind of SNCrW stainless steel metallographic etchant and its preparation method and application method |
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