CN109916685B - Corrosion observation method for Nb-Cu composite plate metallographic structure - Google Patents
Corrosion observation method for Nb-Cu composite plate metallographic structure Download PDFInfo
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Abstract
The invention discloses a corrosion observation method of a metallographic structure of a Nb-Cu composite plate, which comprises the following steps: firstly, machining a metallographic observation plane of the Nb-Cu composite plate; secondly, grinding the metallographic observation plane of the machined Nb-Cu composite plate and then punching sand grains; polishing the metallographic observation plane of the Nb-Cu composite plate after sand particles are washed away; fourthly, carrying out primary corrosion on the metallographic observation plane of the polished Nb-Cu composite plate; fifthly, carrying out secondary corrosion on the metallographic observation plane of the Nb-Cu composite plate subjected to the primary corrosion; sixthly, carrying out metallographic structure observation on the metallographic observation plane of the Nb-Cu composite plate subjected to secondary corrosion. According to the invention, the Nb-Cu composite board after grinding and polishing is subjected to primary and secondary corrosion in sequence, so that the Nb plate and the Cu plate in the Nb-Cu composite board are respectively clearly shown, and thus a clear and real Nb-Cu composite board metallographic structure is obtained, and the observation is convenient.
Description
Technical Field
The invention belongs to the technical field of composite material surface structure observation, and particularly relates to a corrosion observation method for a metallographic structure of a Nb-Cu composite plate.
Background
The composite plate is formed by coating another metal plate on one metal plate, so that the effects of saving resources and reducing cost are achieved on the premise of not reducing the using effect (corrosion resistance, mechanical strength and the like), and the composite plate is mainly applied to industries such as corrosion prevention, pressure vessels, electric construction, petrifaction, medicine, light industry, automobiles and the like. The commonly used compounding methods include explosion compounding, explosion rolling compounding, rolling compounding and the like. In order to study the performance of the composite board, the microstructure of the composite board needs to be observed to determine the type and uniformity of the microstructure, so as to lay the foundation for improving the process of the composite board. The Nb-Cu composite plate also has a wide application range, but the corrosive agent of the Cu cannot corrode Nb due to the large difference of the corrosive agents of the Nb and the Cu, and the corrosive agent of the Nb can corrode Cu but deeply corrode to obtain a real microstructure, so that the metallographic microstructure cannot be observed during Nb-Cu corrosion.
Disclosure of Invention
The invention aims to solve the technical problem of providing a corrosion observation method for a metallographic structure of an Nb-Cu composite plate aiming at the defects of the prior art. According to the method, the Nb-Cu composite board after grinding and polishing is subjected to primary corrosion and secondary corrosion by sequentially adopting the corrosion solution A and the corrosion solution B, so that the Nb plate and the Cu plate in the Nb-Cu composite board are clearly shown respectively, a clear and real Nb-Cu composite board metallographic structure is obtained, the observation is convenient, and the defect that the corrosive cannot corrode Nb or corrode Cu excessively and cannot obtain a real metallographic microstructure due to the fact that the Nb corrosive and the Cu corrosive are different greatly is overcome.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a corrosion observation method for a metallographic structure of a Nb-Cu composite plate is characterized by comprising the following steps:
firstly, machining a metallographic observation plane of the Nb-Cu composite plate on a composite surface of the Nb-Cu composite plate;
secondly, placing the metallographic observation plane of the Nb-Cu composite plate machined in the first step on a pre-grinding machine, grinding the metallographic observation plane by using sand paper, and then washing away sand grains on the metallographic observation plane of the ground Nb-Cu composite plate by using water;
thirdly, placing the metallographic observation plane of the Nb-Cu composite plate subjected to sand washing by water in the second step on a polishing machine for polishing; the polishing agent adopted by the polishing is Cr2O3Solution and Al with grain diameter of 5-10 mu m2O3A suspension of powder;
step four, carrying out primary corrosion on the metallographic observation plane of the polished Nb-Cu composite plate in the step three by using a corrosion solution A; the etching solution A is composed of HF solution and HNO3Solution and H2O is according to (1-5): (1-2): (1-2) by volume ratio;
step five, carrying out secondary corrosion on the metallographic observation plane of the Nb-Cu composite plate subjected to the primary corrosion in the step four by adopting a corrosion solution B; the etching solution B is made of HNO3Solution and H2O is according to (1-4): (1-2) by volume ratio;
and sixthly, carrying out metallographic structure observation on the metallographic observation plane of the Nb-Cu composite plate subjected to the secondary corrosion in the fifth step by adopting a metallographic microscope.
The invention processes a metallographic observation plane on a Nb-Cu composite plate, and then carries out metallographic structure observation after grinding, polishing, primary corrosion and secondary corrosion in sequence, firstly, a corrosive solution A is adopted to carry out primary corrosion on the Nb-Cu composite plate after grinding and polishing, the corrosive solution A has lower corrosion performance than that of a common metal Nb corrosive solution, so that the Nb plate in the Nb-Cu composite plate is corroded and displays a clear metallographic structure, the Cu plate is not influenced or a shallow metallographic structure appears after slight corrosion on a local area, then, a corrosive solution B is adopted to carry out secondary corrosion on the metallographic observation plane of the Nb-Cu composite plate after primary corrosion, so that the Cu plate in the Nb-Cu composite plate is corroded and displays a clear metallographic structure, and the metallographic structure displayed by the Nb plate has no deepened sign, thereby the metallographic structure in the Nb-Cu composite plate is clearly displayed, the defect that a real metallographic microstructure cannot be obtained due to the fact that Nb in the Nb-Cu composite plate cannot be corroded by the corrosive agent or Cu in the Nb-Cu composite plate is corroded excessively due to the fact that the corrosion performance difference of the Nb corrosive agent and the Cu corrosive agent is large is overcome. The method has simple operation, adopts the corrosive solution without toxicity and harm, can clearly observe the metallographic structure of the Nb-Cu composite plate, does not need any special equipment, and is easy to popularize and apply.
The corrosion observation method for the Nb-Cu composite plate metallographic structure is characterized in that in the grinding process of the second step, the grinding process sequentially adopts the grinding process with the granularity of 150#、320#、400#And 1000#The metallographic waterproof abrasive paper gradually grinds the metallographic observation plane of the machined Nb-Cu composite plate, and after the metallographic waterproof abrasive paper is replaced each time, the metallographic observation plane of the machined Nb-Cu composite plate is rotated by 90 degrees along the grinding direction and then ground until scratches ground last time are ground. The metallographic waterproof abrasive paper with the granularity is adopted for polishing step by step, so that impurities and an oxide layer generated by machining on the observation plane of the Nb-Cu composite plate can be effectively removed, the metallographic observation plane of the Nb-Cu composite plate is fully exposed, and the subsequent observation of the metallographic structure of the Nb-Cu composite plate is facilitated; and the step-by-step polishing process is mature and easy to use.
The corrosion observation method for the Nb-Cu composite plate metallographic structure is characterized in that the mass concentration of the HF solution in the fourth step is 40%, and the HNO is added3The mass concentration of the solution was 65%. The above HF solution and HNO3The mass concentration of the solution is the concentration commonly used for corresponding acid liquor, and the solution does not need to be prepared again and is convenient to use.
The corrosion observation method for the Nb-Cu composite plate metallographic structure is characterized in that the corrosion solution A in the fourth step is composed of HF solution and HNO3Solution and H2O is as follows 3:1:1 in a volume ratio. The corrosion performance of the corrosion solution A in the proportion is relatively proper, so that the Nb plate in the Nb-Cu composite plate is guaranteed to be corroded, a clear metallographic structure is displayed, the phenomenon that the metallographic structure is damaged due to the fact that the Cu plate is seriously corroded is avoided, and the real metallographic structure of the Nb-Cu composite plate is obtained.
The corrosion observation method for the Nb-Cu composite plate metallographic structure is characterized in that the corrosion solution A in the fourth step is composed of HF solution and HNO3Solution and H2O is as follows 3:1:2, and the volume ratio is prepared. The corrosion performance of the corrosion solution A in the proportion is relatively proper, so that the Nb plate in the Nb-Cu composite plate is guaranteed to be corroded, a clear metallographic structure is displayed, the Cu plate is prevented from being corroded, and the real Nb-Cu composite plate metallographic structure is obtained.
The corrosion observation method of the Nb-Cu composite plate metallographic structure is characterized in that the time of the primary corrosion in the fourth step is 3-15 s. The one-time corrosion time ensures that the Nb plate in the Nb-Cu composite plate is fully corroded and displays a clear metallographic structure, so that the metallographic structures of the Nb plate and the Cu plate are prevented from being damaged due to overlong one-time corrosion time, and the Nb-Cu composite plate is safe, reliable and high in efficiency.
The corrosion observation method for the metallographic structure of the Nb-Cu composite plate is characterized in that HNO is adopted in the fifth step3The mass concentration of the solution was 65%. The mass concentration of the HF solution is the concentration commonly used by the HF solution, and the HF solution is not required to be prepared again and is convenient to use.
The corrosion observation method for the Nb-Cu composite plate metallographic structure is characterized in that in the fifth step, the corrosion solution B is HNO3Solution and H2O is as follows 1:1 in a volume ratio. The corrosion solution B with the proportion has proper corrosion performance, can ensure that a Cu plate in the Nb-Cu composite plate is corroded and displays a clear metallographic structure, and also avoids the metallographic structure displayed by the Nb plate from being deepened, so that the metallographic structure in the Nb-Cu composite plate is clearly displayed, and the real metallographic structure of the Nb-Cu composite plate is favorably obtained.
The corrosion observation method for the Nb-Cu composite plate metallographic structure is characterized in that the time of the secondary corrosion in the fifth step is 2-10 s. The secondary corrosion time not only ensures that the Cu plate in the Nb-Cu composite plate is fully corroded and displays a clear metallographic structure, but also avoids the destruction of the metallographic structures of the Nb plate and the Cu plate caused by overlong secondary corrosion time, and the Nb-Cu composite plate is safe, reliable and high in efficiency.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the Nb-Cu composite board after grinding and polishing is subjected to primary corrosion and secondary corrosion by sequentially adopting the corrosion solution A and the corrosion solution B, so that the Nb plate and the Cu plate in the Nb-Cu composite board are clearly shown respectively, a clear and real Nb-Cu composite board metallographic structure is obtained, the observation is convenient, and the defect that the corrosive cannot corrode Nb or corrode Cu too much to obtain a real metallographic microstructure due to the large difference between the Nb corrosive and the Cu corrosive is overcome.
2. The method has simple operation, adopts the corrosive solution without toxicity and harm, can clearly observe the metallographic structure of the Nb-Cu composite plate, does not need any special equipment, and is easy to popularize and apply.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Drawings
Fig. 1 is a metallographic structure diagram of a composite surface of an Nb — Cu composite sheet according to example 1 of the present invention.
Fig. 2 is a metallographic structure diagram of a Cu plate in the Nb-Cu composite sheet according to example 1 of the present invention.
Fig. 3 is a metallographic structure diagram of an Nb plate in an Nb-Cu composite plate according to example 1 of the present invention.
FIG. 4 is a metallographic structure diagram of a composite surface of an Nb-Cu composite plate according to comparative example 1 of the present invention.
FIG. 5 is a metallographic structure diagram of the composite surface of the Nb-Cu composite plate of comparative example 2 of the present invention.
Fig. 6 is a metallographic structure diagram of a composite surface of an Nb — Cu composite sheet according to example 2 of the present invention.
Fig. 7 is a metallographic structure diagram of a Cu plate in an Nb-Cu composite sheet according to example 2 of the present invention.
Fig. 8 is a metallographic structure diagram of an Nb plate in an Nb-Cu clad plate according to example 2 of the present invention.
Fig. 9 is a metallographic structure diagram of a composite surface of an Nb — Cu composite sheet according to example 3 of the present invention.
Fig. 10 is a metallographic structure diagram of a Cu plate in an Nb-Cu composite sheet according to example 3 of the present invention.
Fig. 11 is a metallographic structure diagram of an Nb plate in an Nb-Cu clad plate according to example 3 of the present invention.
Detailed Description
Example 1
The embodiment comprises the following steps:
firstly, machining a metallographic observation plane of the Nb-Cu composite plate on a composite surface of the Nb-Cu composite plate;
secondly, placing the metallographic observation plane of the Nb-Cu composite plate machined in the first step on a pre-grinding machine, grinding the metallographic observation plane by using sand paper, and then washing away sand grains on the metallographic observation plane of the ground Nb-Cu composite plate by using water; in the grinding process, the particle size of 150 is adopted in sequence#、320#、400#And 1000#The metallographic waterproof abrasive paper gradually grinds the metallographic observation plane of the machined Nb-Cu composite plate, and after the metallographic waterproof abrasive paper is replaced each time, the metallographic observation plane of the machined Nb-Cu composite plate is rotated by 90 degrees along the grinding direction and then ground until scratches ground last time are ground;
thirdly, placing the metallographic observation plane of the Nb-Cu composite plate subjected to sand washing by water in the second step on a polishing machine for polishing; the polishing agent adopted by the polishing is Cr2O3Solution and Al with grain diameter of 5-10 mu m2O3A suspension of powder;
step four, carrying out primary corrosion on the polished metallographic observation plane of the Nb-Cu composite plate in the step three for 10s by using a corrosion solution A; the etching solution A is composed of HF solution with mass concentration of 40% and HNO with mass concentration of 65%3Solution and H2The O is prepared according to the volume ratio of 3:1: 1;
step five, carrying out secondary corrosion on the metallographic observation plane of the Nb-Cu composite plate subjected to the primary corrosion in the step four for 5s by adopting a corrosion solution B; the corrosive solution B is prepared from 65% of HNO (HNO)3Solution and H2The O is prepared according to the volume ratio of 1: 1;
and sixthly, carrying out metallographic structure observation on the metallographic observation plane of the Nb-Cu composite plate subjected to the secondary corrosion in the fifth step by adopting a metallographic microscope.
Fig. 1 is a metallographic structure diagram of a composite surface of the Nb-Cu composite plate according to the present embodiment, and as can be seen from fig. 1, a metallographic structure of Nb and a metallographic structure of Cu in the composite surface of the Nb-Cu composite plate according to the present embodiment are both clearly shown, and no corrosion phenomenon occurs.
Fig. 2 is a metallographic structure diagram of a Cu plate in the Nb-Cu composite plate according to the present embodiment, and as can be seen from fig. 2, the metallographic structure of the Cu plate in the Nb-Cu composite plate according to the present embodiment is clear, and no corrosion is caused too deeply.
Fig. 3 is a metallographic structure diagram of the Nb plate in the Nb-Cu composite plate of the present embodiment, and as can be seen from fig. 3, the metallographic structure of the Nb plate in the Nb-Cu composite plate of the present embodiment is clear.
Comparative example 1
This comparative example comprises the following steps:
firstly, machining a metallographic observation plane of the Nb-Cu composite plate on a composite surface of the Nb-Cu composite plate;
secondly, placing the metallographic observation plane of the Nb-Cu composite plate machined in the first step on a pre-grinding machine, grinding the metallographic observation plane by using sand paper, and then washing away sand grains on the metallographic observation plane of the ground Nb-Cu composite plate by using water; in the grinding process, the particle size of 150 is adopted in sequence#、320#、400#And 1000#The metallographic waterproof abrasive paper gradually grinds the metallographic observation plane of the machined Nb-Cu composite plate, and after the metallographic waterproof abrasive paper is replaced each time, the metallographic observation plane of the machined Nb-Cu composite plate is rotated by 90 degrees along the grinding direction and then ground until scratches ground last time are ground;
thirdly, placing the metallographic observation plane of the Nb-Cu composite plate subjected to sand washing by water in the second step on a polishing machine for polishing; the polishing agent adopted by the polishing is Cr2O3Solution and Al with grain diameter of 5-10 mu m2O3A suspension of powder;
corroding the polished metallographic observation plane of the Nb-Cu composite plate for 10s by using a corrosive solution; the corrosion solution consists of HF solution with the mass concentration of 40% and HNO with the mass concentration of 65%3The solution is prepared according to the volume ratio of 3: 1;
and step five, carrying out metallographic structure observation on the corroded Nb-Cu composite plate metallographic observation plane in the step four by using a metallographic microscope.
Fig. 4 is a metallographic structure diagram of the composite surface of the Nb-Cu composite plate of this comparative example, and it can be seen from fig. 4 that the Nb-Cu composite plate is corroded by the Nb corrosion solution in the prior art, and the metallographic structure of the Nb plate in the obtained Nb-Cu composite plate metallographic structure is clear, but the Nb corrosion solution corrodes the Cu plate too deeply, and the metallographic structure of the Cu plate is destroyed and cannot be observed, so that a clear and real metallographic structure of the composite surface of the Nb-Cu composite plate cannot be obtained.
Comparative example 2
This comparative example comprises the following steps:
firstly, machining a metallographic observation plane of the Nb-Cu composite plate on a composite surface of the Nb-Cu composite plate;
secondly, placing the metallographic observation plane of the Nb-Cu composite plate machined in the first step on a pre-grinding machine, grinding the metallographic observation plane by using sand paper, and then washing away sand grains on the metallographic observation plane of the ground Nb-Cu composite plate by using water; in the grinding process, the particle size of 150 is adopted in sequence#、320#、400#And 1000#The metallographic waterproof abrasive paper gradually grinds the metallographic observation plane of the machined Nb-Cu composite plate, and after the metallographic waterproof abrasive paper is replaced each time, the metallographic observation plane of the machined Nb-Cu composite plate is rotated by 90 degrees along the grinding direction and then ground until scratches ground last time are ground;
thirdly, placing the metallographic observation plane of the Nb-Cu composite plate subjected to sand washing by water in the second step on a polishing machine for polishing; the polishing agent adopted by the polishing is Cr2O3Solution and Al with grain diameter of 5-10 mu m2O3A suspension of powder;
corroding the metallographic observation plane of the polished Nb-Cu composite plate obtained in the step three for 5 seconds by using a corrosive solution; the corrosion solution is prepared from an HF solution with the mass concentration of 40% and water according to the volume ratio of 1: 1;
and step five, carrying out metallographic structure observation on the corroded Nb-Cu composite plate metallographic observation plane in the step four by using a metallographic microscope.
Fig. 5 is a metallographic structure diagram of the composite surface of the Nb-Cu composite plate of the present comparative example, and it can be seen from fig. 5 that when the Nb-Cu composite plate is corroded by using the Cu corrosion solution in the prior art, the metallographic structure of the Cu plate in the metallographic structure of the obtained Nb-Cu composite plate is clear, but the Cu corrosion solution cannot corrode the Nb plate, and the metallographic structure of the Nb plate cannot be exposed, so that observation cannot be performed, and the metallographic structure of the composite surface of the complete Nb-Cu composite plate cannot be obtained.
Comparing fig. 1, fig. 4 and fig. 5, it can be seen that the Nb-Cu composite plate is corroded by the corrosive liquid a and the corrosive liquid B in sequence, so that a metallographic structure of the Nb-Cu composite plate with clear metallographic structures of the Cu plate and the Nb plate can be obtained, and the defect that the corrosive cannot corrode Nb or corrode Cu excessively to obtain a true metallographic microstructure in the Nb-Cu composite plate due to a large difference between the Nb corrosive and the Cu corrosive is overcome.
Example 2
The embodiment comprises the following steps:
firstly, machining a metallographic observation plane of the Nb-Cu composite plate on a composite surface of the Nb-Cu composite plate;
secondly, placing the metallographic observation plane of the Nb-Cu composite plate machined in the first step on a pre-grinding machine, grinding the metallographic observation plane by using sand paper, and then washing away sand grains on the metallographic observation plane of the ground Nb-Cu composite plate by using water; in the grinding process, the particle size of 150 is adopted in sequence#、320#、400#And 1000#The metallographic waterproof abrasive paper gradually grinds the metallographic observation plane of the machined Nb-Cu composite plate, and after the metallographic waterproof abrasive paper is replaced each time, the metallographic observation plane of the machined Nb-Cu composite plate is rotated by 90 degrees along the grinding direction and then ground until scratches ground last time are ground;
thirdly, placing the metallographic observation plane of the Nb-Cu composite plate subjected to sand washing by water in the second step on a polishing machine for polishing; the polishing agent adopted by the polishing is Cr2O3Solution and Al with grain diameter of 5-10 mu m2O3A suspension of powder;
step four, corroding the polished metallographic observation plane of the Nb-Cu composite plate for 20s by using a corrosive solution A;the etching solution A is composed of HF solution with mass concentration of 40% and HNO with mass concentration of 65%3Solution and H2The O is prepared according to the volume ratio of 1:2: 2;
step five, carrying out secondary corrosion on the metallographic observation plane of the Nb-Cu composite plate subjected to the primary corrosion in the step four for 10s by adopting a corrosion solution B; the corrosive solution B is prepared from 65% of HNO (HNO)3Solution and H2The O is prepared according to the volume ratio of 1: 2;
and sixthly, carrying out metallographic structure observation on the metallographic observation plane of the Nb-Cu composite plate subjected to the secondary corrosion in the fifth step by adopting a metallographic microscope.
Fig. 6 is a metallographic structure diagram of the composite surface of the Nb-Cu composite plate according to the present embodiment, and as can be seen from fig. 6, the metallographic structure of Nb and the metallographic structure of Cu in the composite surface of the Nb-Cu composite plate according to the present embodiment are both clearly shown, and the phenomenon of excessive corrosion is not generated.
Fig. 7 is a metallographic structure diagram of a Cu plate in the Nb-Cu composite plate according to the present embodiment, and as can be seen from fig. 7, the metallographic structure of the Cu plate in the Nb-Cu composite plate according to the present embodiment is clear, and no corrosion deepening occurs.
Fig. 8 is a metallographic structure diagram of the Nb plate in the Nb-Cu composite plate of the present embodiment, and as can be seen from fig. 8, the metallographic structure of the Nb plate in the Nb-Cu composite plate of the present embodiment is clear.
Example 3
The embodiment comprises the following steps:
firstly, machining a metallographic observation plane of the Nb-Cu composite plate on a composite surface of the Nb-Cu composite plate;
secondly, placing the metallographic observation plane of the Nb-Cu composite plate machined in the first step on a pre-grinding machine, grinding the metallographic observation plane by using sand paper, and then washing away sand grains on the metallographic observation plane of the ground Nb-Cu composite plate by using water; in the grinding process, the particle size of 150 is adopted in sequence#、320#、400#And 1000#The metallographic waterproof abrasive paper gradually grinds the metallographic observation plane of the machined Nb-Cu composite plate, and after the metallographic waterproof abrasive paper is replaced each time, the metallographic observation plane of the machined Nb-Cu composite plate is rotated by 90 degrees along the grinding direction and then is ground, and the grinding is carried out directlyGrinding off the scratch of the last grinding;
thirdly, placing the metallographic observation plane of the Nb-Cu composite plate subjected to sand washing by water in the second step on a polishing machine for polishing; the polishing agent adopted by the polishing is Cr2O3Solution and Al with grain diameter of 5-10 mu m2O3A suspension of powder;
step four, carrying out primary corrosion on the polished metallographic observation plane of the Nb-Cu composite plate in the step three for 3s by using a corrosion solution A; the etching solution A is composed of HF solution with mass concentration of 40% and HNO with mass concentration of 65%3Solution and H2The O is prepared according to the volume ratio of 5:1: 1;
step five, carrying out secondary corrosion on the metallographic observation plane of the Nb-Cu composite plate subjected to the primary corrosion in the step four for 2s by adopting a corrosion solution B; the corrosive solution B is prepared from 65% of HNO (HNO)3Solution and H2The O is prepared according to the volume ratio of 4: 1;
and sixthly, carrying out metallographic structure observation on the metallographic observation plane of the Nb-Cu composite plate subjected to the secondary corrosion in the fifth step by adopting a metallographic microscope.
Fig. 9 is a metallographic structure diagram of the composite surface of the Nb-Cu composite plate according to the present embodiment, and as can be seen from fig. 9, the metallographic structure of Nb and the metallographic structure of Cu in the composite surface of the Nb-Cu composite plate according to the present embodiment are both clearly shown, and the phenomenon of excessive corrosion is not generated.
Fig. 10 is a metallographic structure diagram of a Cu plate in the Nb-Cu composite plate according to the present embodiment, and as can be seen from fig. 10, the metallographic structure of the Cu plate in the Nb-Cu composite plate according to the present embodiment is clear, and no corrosion deepening phenomenon occurs.
Fig. 11 is a metallographic structure diagram of the Nb plate in the Nb-Cu composite sheet of the present embodiment, and as can be seen from fig. 11, the metallographic structure of the Nb plate in the Nb-Cu composite sheet of the present embodiment is clear.
Example 4
The embodiment comprises the following steps:
firstly, machining a metallographic observation plane of the Nb-Cu composite plate on a composite surface of the Nb-Cu composite plate;
step two, machining in the step onePlacing the metallographic observation plane of the Nb-Cu composite plate on a pre-grinding machine, grinding by using sand paper, and then washing away sand grains on the metallographic observation plane of the ground Nb-Cu composite plate by using water; in the grinding process, the particle size of 150 is adopted in sequence#、320#、400#And 1000#The metallographic waterproof abrasive paper gradually grinds the metallographic observation plane of the machined Nb-Cu composite plate, and after the metallographic waterproof abrasive paper is replaced each time, the metallographic observation plane of the machined Nb-Cu composite plate is rotated by 90 degrees along the grinding direction and then ground until scratches ground last time are ground;
thirdly, placing the metallographic observation plane of the Nb-Cu composite plate subjected to sand washing by water in the second step on a polishing machine for polishing; the polishing agent adopted by the polishing is Cr2O3Solution and Al with grain diameter of 5-10 mu m2O3A suspension of powder;
step four, carrying out primary corrosion on the polished Nb-Cu composite plate metallographic observation plane in the step three for 15s by using a corrosion solution A; the etching solution A is composed of HF solution with mass concentration of 40% and HNO with mass concentration of 65%3Solution and H2The O is prepared according to the volume ratio of 3:1: 2;
step five, carrying out secondary corrosion on the metallographic observation plane of the Nb-Cu composite plate subjected to the primary corrosion in the step four for 5s by adopting a corrosion solution B; the corrosive solution B is prepared from 65% of HNO (HNO)3Solution and H2The O is prepared according to the volume ratio of 1: 1;
and sixthly, carrying out metallographic structure observation on the metallographic observation plane of the Nb-Cu composite plate subjected to the secondary corrosion in the fifth step by adopting a metallographic microscope.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.
Claims (5)
1. A corrosion observation method for a metallographic structure of a Nb-Cu composite plate is characterized by comprising the following steps:
firstly, machining a metallographic observation plane of the Nb-Cu composite plate on a composite surface of the Nb-Cu composite plate;
secondly, placing the metallographic observation plane of the Nb-Cu composite plate machined in the first step on a pre-grinding machine, grinding the metallographic observation plane by using sand paper, and then washing away sand grains on the metallographic observation plane of the ground Nb-Cu composite plate by using water;
thirdly, placing the metallographic observation plane of the Nb-Cu composite plate subjected to sand washing by water in the second step on a polishing machine for polishing; the polishing agent adopted by the polishing is Cr2O3Solution and Al with particle size of 5-10 mu m2O3A suspension of powder;
step four, carrying out primary corrosion on the metallographic observation plane of the polished Nb-Cu composite plate in the step three by using a corrosion solution A; the etching solution A is composed of HF solution and HNO3Solution and H2O is according to (1-5): (1-2): (1-2) by volume ratio; the mass concentration of the HF solution is 40%, and the HNO solution3The mass concentration of the solution is 65%, and the time of the primary corrosion is 3-15 s;
step five, carrying out secondary corrosion on the metallographic observation plane of the Nb-Cu composite plate subjected to the primary corrosion in the step four by adopting a corrosion solution B; the etching solution B is made of HNO3Solution and H2O is according to (1-4): (1-2) by volume ratio; the HNO3The mass concentration of the solution is 65%, and the time of the secondary corrosion is 2-10 s;
and sixthly, carrying out metallographic structure observation on the metallographic observation plane of the Nb-Cu composite plate subjected to the secondary corrosion in the fifth step by adopting a metallographic microscope.
2. The method for observing corrosion of metallographic structure of Nb-Cu composite plate according to claim 1, wherein in the grinding process of the second step, a grain size of 150 is adopted in sequence#、320#、400#And 1000#The metallographic waterproof abrasive paper gradually grinds the metallographic observation plane of the machined Nb-Cu composite plate, and the metallographic waterproof abrasive paper is replaced every timeAnd then, rotating the metallographic observation plane of the machined Nb-Cu composite plate by 90 degrees along the grinding direction, and then grinding until scratches of the previous grinding are ground off.
3. The corrosion observation method of the metallographic structure of the Nb-Cu composite plate according to claim 1, wherein the corrosion solution A in the fourth step is composed of HF solution and HNO solution3Solution and H2O is as follows 3:1:1 in a volume ratio.
4. The corrosion observation method of the metallographic structure of the Nb-Cu composite plate according to claim 1, wherein the corrosion solution A in the fourth step is composed of HF solution and HNO solution3Solution and H2O is as follows 3:1:2, and the volume ratio is prepared.
5. The corrosion observation method of Nb-Cu composite plate metallographic structure according to claim 1, wherein in step five, the etching solution B is HNO3Solution and H2O is as follows 1:1 in a volume ratio.
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| CN201910254083.XA CN109916685B (en) | 2019-03-30 | 2019-03-30 | Corrosion observation method for Nb-Cu composite plate metallographic structure |
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| CN201910254083.XA CN109916685B (en) | 2019-03-30 | 2019-03-30 | Corrosion observation method for Nb-Cu composite plate metallographic structure |
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| CN109916685A CN109916685A (en) | 2019-06-21 |
| CN109916685B true CN109916685B (en) | 2021-08-06 |
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