CN111398146A - Static high-temperature molten salt corrosion test device and test method convenient for multi-period sampling - Google Patents
Static high-temperature molten salt corrosion test device and test method convenient for multi-period sampling Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 97
- 150000003839 salts Chemical class 0.000 title claims abstract description 66
- 238000005260 corrosion Methods 0.000 title claims abstract description 48
- 230000007797 corrosion Effects 0.000 title claims abstract description 48
- 238000005070 sampling Methods 0.000 title claims abstract description 40
- 230000003068 static effect Effects 0.000 title claims abstract description 25
- 238000010998 test method Methods 0.000 title claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 11
- 239000000725 suspension Substances 0.000 claims abstract description 7
- 230000000712 assembly Effects 0.000 claims description 15
- 238000000429 assembly Methods 0.000 claims description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 239000007769 metal material Substances 0.000 claims description 3
- 229910000963 austenitic stainless steel Inorganic materials 0.000 claims description 2
- 239000000919 ceramic Substances 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 230000000903 blocking effect Effects 0.000 claims 1
- 238000003780 insertion Methods 0.000 claims 1
- 230000037431 insertion Effects 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 239000002994 raw material Substances 0.000 claims 1
- 238000011056 performance test Methods 0.000 abstract description 2
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 5
- 238000010248 power generation Methods 0.000 description 4
- 229910002651 NO3 Inorganic materials 0.000 description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 3
- 238000005258 corrosion kinetic Methods 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 150000002823 nitrates Chemical class 0.000 description 2
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 239000010963 304 stainless steel Substances 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
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Abstract
The invention discloses a static high-temperature molten salt corrosion test device and a test method convenient for multi-period sampling, and the device comprises a crucible assembly, a connecting rod assembly and a branch assembly, wherein the crucible assembly is used for containing molten salt, the branch assembly and a crucible cover are connected into a whole through a connecting piece by the connecting rod assembly to form a sample suspension structure which is stably supported, the sampling operation can be greatly simplified by using the structure during multi-period sampling, and the problem of insufficient contact between the sample and the molten salt in the test process is avoided by suspending the sample on the branch. The invention has convenient assembly and disassembly, all parts can be replaced, and the invention can be repeatedly used. When the corrosion characteristics and the dynamic curve of the material are subjected to multi-period sampling and determination in different time, the testing method and the testing device can ensure the continuity of the test and the consistency of the test environment, are convenient for frequent sampling, and provide good basic guarantee for the corrosion performance test and the corrosion rate determination of the material in the static high-temperature molten salt environment.
Description
Technical Field
The invention belongs to a high-temperature molten salt corrosion test of a metal material, and particularly relates to a static high-temperature molten salt corrosion test device and a test method which are convenient for multi-period sampling.
Background
In recent years, development and utilization of renewable energy have been receiving wide attention worldwide, and among them, solar photo-thermal power generation (CSP) gradually shows great potential for development because it can realize continuous and stable power generation. The power generation technology needs to use a large amount of molten salt as a heat transfer and storage medium, and the molten salt has certain corrosiveness at high temperature. When the CSP device is in operation, equipment such as a container, a pipeline and the like which are in contact with the high-temperature molten salt can be corroded by the molten salt in the long-term service process, and the practical application value of the high-temperature molten salt in the field of photo-thermal power generation is greatly influenced. The corrosion problem of the structural material in the high-temperature molten salt environment can not only improve the operation and maintenance cost of the CSP power station, but also greatly increase the failure risk of the equipment due to corrosion, and reduce the reliability and the service life of the equipment. In addition, the material manufacturing equipment with good compatibility with the high-temperature molten salt is selected, and the method has important significance for reducing the cost of the whole CSP power station. Therefore, the corrosion characteristics and mechanism of the structural material in the high-temperature molten salt are researched, the corrosion rule of the material in the high-temperature molten salt is evaluated, and theoretical basis and scientific guidance can be provided for the design, material selection, maintenance, repair, replacement and other aspects of equipment in the CSP power station, which is in contact with the molten salt.
At present, the existing static high-temperature molten salt corrosion test method is to directly put a sample into a crucible for testing. If the test of different duration and still guaranteeing the continuity needs to be carried out, need put a lot of crucibles in heating device, the sample is put in different crucibles, and not only the test condition has the difference, and still can start and stop the test device when the many periods of time sample, is not suitable for the long-term corrosion test that different duration needs the sample not very much. Further, the reliability of the test may be affected by problems such as contact between samples and insufficient contact between a surface of a sample and the molten salt due to adhesion to the crucible. In addition, some static high-temperature molten salt corrosion tests adopt metal containers or sealed quartz tubes sealed by flange covers, and the multi-period sampling operation of the test device in the long-term corrosion test process is very inconvenient, and the sampling of equipment needs to be repeatedly started and stopped. Moreover, for static high-temperature molten salt corrosion tests with a large number of tests without requirements on test atmosphere (such as binary molten nitrate salt needs to be tested in an air environment to prevent molten salt decomposition), the requirements of the tests are difficult to meet by using the device of the type, the cost is high, and the sampling is inconvenient.
Disclosure of Invention
The invention provides a static high-temperature molten salt corrosion test device and a test method convenient for multi-period sampling, which solve the problem of insufficient contact between a sample and molten salt and greatly simplify multi-period sampling operation.
The technical solution for realizing the purpose of the invention is as follows: a static high-temperature molten salt corrosion test device convenient for multi-period sampling comprises a crucible assembly, a connecting rod assembly and a branch assembly provided with a plurality of samples, wherein the crucible assembly is used for containing prepared molten salt; one end of the connecting rod assembly is arranged in the crucible assembly, and the other end of the connecting rod assembly is positioned outside the crucible assembly and is used for connecting the crucible assembly into a whole, so that a sample suspension structure is formed through the support of the crucible assembly; the branch assemblies are assembled with a plurality of samples and fixed on the connecting rod assembly through connecting pieces to jointly form a sample tree.
A test method of a static high-temperature molten salt corrosion test device convenient for multi-period sampling comprises the following steps:
step 1), according to the test material type number n and the molten salt type number m, taking n ∙ m installed test devices convenient for multi-time-period sampling, wherein the sample materials arranged in the same device are consistent, and avoiding the mutual influence of different materials in the corrosion process; fixing the sample and the circular retaining sheet on the sleeve in sequence;
step 2), respectively putting the prepared m mixed salt solids into a muffle furnace to be heated to be in a molten state, respectively pouring the m molten salt in the molten state into the crucible assembly in the step 1), enabling the liquid level of the molten salt to be about 2cm +/-5 mm below a crucible opening, and vertically putting the connecting rod assemblies provided with different material samples into the crucibles to ensure that all the samples are soaked in the molten salt; finally, putting all the crucible assemblies into a muffle furnace, setting the test temperature, and starting the test;
and 3) when the set time point is reached for sampling, taking out the whole testing device from the muffle furnace, clamping the center rod above the crucible cover by using steel tongs, slowly lifting, taking down a sample to be taken from the sleeve, putting the whole connecting rod assembly back into the crucible, and putting the whole testing device back into the muffle furnace for continuous testing.
Compared with the prior art, the invention has the remarkable advantages that:
(1) the device is low in cost and simple and convenient to mount and dismount.
(2) A stable sample suspension structure is formed by utilizing the support of the crucible assembly, so that each surface of the suspended sample is fully contacted with the molten salt.
(3) The sleeve and the ring baffle are adopted to isolate the sample from the device and the sample, so that the occurrence of gap corrosion and poor contact is avoided, and the test result is more reliable and real.
(4) In the sampling process of each time period, the upper end of the central rod is lifted, and the sample can be taken out; then, the crucible cover is covered, the subsequent test is continuously carried out, the equipment does not need to be shut down, the operation is simple and safe during sampling, and the continuity of the multi-sample test and the consistency of the test environment can be kept.
Drawings
Fig. 1 is a schematic view and a partial structure enlarged view after the assembly of the present invention.
Fig. 2 is a schematic view of the connector of the present invention.
FIG. 3 is a schematic view of a crucible cover of the present invention.
FIG. 4 is a schematic representation of a sample of the present invention.
FIG. 5 is a schematic view of a circular ring baffle of the present invention.
Fig. 6 is a schematic diagram of a pin of the present invention.
Fig. 7 is a schematic view of the bushing of the present invention.
FIG. 8 is a schematic view of a sheet of the present invention.
FIG. 9 shows the corrosion kinetics of the test results.
Detailed Description
The present invention is described in further detail below with reference to the attached drawing figures.
With reference to fig. 1 to 8, a static high-temperature molten salt corrosion test device convenient for multi-period sampling comprises a crucible assembly, a connecting rod assembly and a branch assembly provided with a plurality of samples 2, wherein the crucible assembly is used for containing prepared molten salt; one end of the connecting rod assembly is arranged in the crucible assembly, and the other end of the connecting rod assembly is positioned outside the crucible assembly and is used for connecting the crucible assembly into a whole, so that a sample suspension structure is formed through the support of the crucible assembly; the branch assemblies of a plurality of samples 2 are assembled, and are fixed on the connecting rod assembly through the connecting piece 8 to jointly form a sample tree.
The crucible assembly comprises a crucible 3 and a crucible cover 4, wherein a central through hole is formed in the center of the crucible cover 4, one end of the connecting rod assembly penetrates through the through hole to be arranged in the crucible 3, and the other end of the connecting rod assembly is located outside the crucible cover 4.
The connecting rod assembly comprises a central rod 7, the central rod 7 is a threaded rod, one end of the central rod 7 is inserted into a central through hole of the crucible cover 4, is not contacted with the bottom of the crucible 3, and is fastened with the crucible cover 4 through a nut 6 and a gasket 5; the other end of the center rod 7 extends out of the crucible cover 4 to be used as a clamping handle. The crucible cover 4 and the connecting piece 8 are connected into a whole by the connecting rod assembly to form a sample suspension structure with stable support, so that the sample can be fully contacted with the molten salt in the test process.
The connecting piece 8 is disc-shaped, a threaded hole is formed in the center of the connecting piece and used for being matched with the central rod 7 so as to adjust the height position of the connecting piece on the central rod 7, a plurality of through holes are distributed in the connecting piece 8 along the circumferential direction, and the branch assemblies are fixed on the through holes so as to adjust the hanging position of the sample 2 in the crucible assembly. The number of samples in each layer of the sample tree can be controlled by the number of the branch assemblies arranged on the connecting piece 8; the design of branch subassembly has avoided the bad contact of sample with the device material to it is more convenient to make many periods of sampling operation.
The branch component comprises a sheet 10, a sleeve 11, a pin 12 and a plurality of circular retaining sheets 1.
The thin sheet 10 comprises an annular thin sheet and a rectangular thin sheet, the annular thin sheet is fixed at one end of the rectangular thin sheet, a first through hole is formed in the other end of the rectangular thin sheet, and the length of the rectangular thin sheet is longer than that of the sleeve 11; the top end of the inserting pin 12 is provided with an end cap to prevent falling off.
The ring-shaped thin slice of the thin slice 10 is fixed in the circumferential through hole of the connecting piece 8; the sleeve 11 is sleeved on the rectangular sheet of the sheet 10, and the pin 12 is inserted into the first through hole of the rectangular sheet and used for preventing the sleeve 11 from sliding out of the sheet 10; the sample 2 is strung on the sleeve 11 through the second through hole, the sample 2 is rectangular, a second through hole is arranged on the sample 2, and a circular baffle plate 1 is arranged between every two adjacent samples 2.
The sheet 10 and the contact pin 12 are made of austenitic stainless steel, and can meet the temperature condition during the test and the corrosion resistance requirement under the test environment; the sleeve 11 and the ring baffle 1 are used as the contact part of the device and the sample 2, and the materials are all ceramics, so that the test error increase caused by galvanic corrosion between different metal materials can be avoided.
The dimensions of the cross-sectional thickness T and width W of the rectangular sheet of the sheet 10 and the inner diameter of the sleeve 11
The following relationship should be satisfied:
to ensure that the sleeve 11 can be just sleeved on the rectangular sheet without loosening, the outer diameter D of the end cap of the inserting pin 12, the length L of the inserting pin and the inner diameter of the sleeve 11
Outer diameter of sleeve 11
Should satisfy the following relations:
，
to ensure the insertionThe needle 12 prevents the cannula 11 from slipping out of the rectangular sheet during sampling and does not impede the removal of the sample 2 from the cannula 11.
The number of the through holes in the circumferential direction of the connecting pieces 8 and the sheets 10 connected with the through holes is increased or decreased as required, and at least 2 connecting pieces 8 can be connected in series on the central rod 7 at the same time to form a multi-layer sample tree, so that the static high-temperature molten salt corrosion tests of multiple samples in different periods can be carried out in batches, and the continuity of the multiple sample tests and the consistency of the test environment can be ensured.
A test method of a static high-temperature molten salt corrosion test device convenient for multi-period sampling comprises the following steps:
step 1), according to the test material type number n and the molten salt type number m, taking n ∙ m installed test devices convenient for multi-time-period sampling, wherein the materials of a sample 2 arranged in the same device are consistent, and avoiding the mutual influence of different materials in the corrosion process; fixing a sample 2 and a circular baffle plate 1 on a sleeve 11 in sequence;
step 2), respectively putting the prepared m mixed salt solids into a muffle furnace to be heated to be in a molten state, respectively pouring the m molten salt in the molten state into the crucible assembly in the step 1), enabling the liquid level of the molten salt to be about 2cm +/-5 mm below a crucible opening, and vertically putting the connecting rod assembly provided with the different material samples 2 into each crucible to ensure that all the samples 2 are soaked in the molten salt; finally, putting all the crucible assemblies into a muffle furnace, setting the test temperature, and starting the test;
and 3) when the set time point is reached for sampling, taking out the whole testing device from the muffle furnace, clamping the central rod 7 above the crucible cover 4 by using steel tongs to slowly lift up, taking down the sample 2 to be taken from the sleeve 11, putting the whole connecting rod assembly back into the crucible 3, and putting the whole testing device back into the muffle furnace for continuous testing.
Example (b):
different materials melt nitrate (60 wt.% NaNO) at 565 deg.C3+40wt.% KNO3) In the corrosion performance test, the sample materials are respectively 304, 316 and 347; stainless steel, three test devices are arranged, samples of three materials are respectively placed, and the same material is testedThe samples were placed in the same apparatus. The number of each material sample was 11, and samples were taken for analysis at time periods of 100, 200, 300, 400, 500, 750, 1000, 1500, 2000, 2500, and 3000h for the corrosion test, respectively.
Step 1), the types of the materials in the test are 3, and 60wt.% of NaNO is adopted as the molten salt3+40wt.% KNO3Taking 3 installed test devices convenient for multi-time-period sampling, and respectively installing 304, 316 and 347 stainless steel samples in the 3 test devices to avoid mutual influence of different materials in the corrosion process; fixing a sample 2 and a circular baffle plate 1 on a sleeve 11 in sequence;
step 2), mixing the prepared 60wt.% NaNO3+40wt.% KNO3Respectively putting the mixed salt solid into a muffle furnace to be heated to be in a molten state, respectively pouring the molten salt into the crucible assemblies in the step 1), enabling the liquid level of the molten salt to be about 2cm +/-5 mm below the crucible openings, and vertically putting connecting rod assemblies provided with different material samples 2 into the crucibles 3 to ensure that all the samples 2 are soaked in the molten salt; finally, putting all the crucible assemblies into a muffle furnace, setting the test temperature, and starting the test;
and 3) when sampling at the set time points of 100, 200, 300, 400, 500, 750, 1000, 1500, 2000, 2500 and 3000h, taking the whole test device out of the muffle furnace, clamping the central rod 7 above the crucible cover 4 by using a steel clamp, slowly lifting the central rod, taking the sample 2 to be taken out of the sleeve 11, putting the whole connecting rod assembly back into the crucible 3, and putting the whole test device back into the muffle furnace for continuous test.
FIG. 9 shows the corrosion kinetics curves of the three stainless steels 304, 316 and 347 in a molten nitrate environment, all of which exhibit parabolic corrosion kinetics, and also shows the difference in corrosion resistance of the three materials in molten nitrate, namely 60wt.% NaNO at 565 ℃3+40wt.% KNO3In a molten nitrate salt environment, the corrosion resistance is as follows: 316>347>304 stainless steel. In this high temperature fused salt corrosion soaking test process, the test device is simple to install and use, and after the test is finished, all parts of the device can be recycled or can be used at any timeAnd sampling at different time periods is simple and safe, and the test continuity and the test environment consistency are also ensured.
Claims (10)
1. The utility model provides a static high temperature fused salt corrosion test device convenient to multi-period sample which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the crucible assembly is used for containing the prepared molten salt;
one end of the connecting rod component is arranged in the crucible component, and the other end of the connecting rod component is positioned outside the crucible component and is used for connecting the crucible component into a whole, so that a sample suspension structure is formed by the support of the crucible component;
the branch assemblies of a plurality of samples (2) are assembled, and are fixed on the connecting rod assembly through the connecting piece (8) to jointly form a sample tree.
2. The static high-temperature molten salt corrosion test device facilitating multi-period sampling according to claim 1, wherein: the crucible assembly comprises a crucible (3) and a crucible cover (4), a central through hole is formed in the center of the crucible cover (4), one end of the connecting rod assembly penetrates through the through hole to be arranged in the crucible (3), and the other end of the connecting rod assembly is located outside the crucible cover (4).
3. The static high-temperature molten salt corrosion test device facilitating multi-period sampling according to claim 2, wherein: the connecting rod assembly comprises a central rod (7), the central rod (7) is a threaded rod, one end of the central rod (7) is inserted into a central through hole of the crucible cover (4), is not contacted with the bottom of the crucible (3), and is fastened with the crucible cover (4) through a nut (6) and a gasket (5); the part of the other end of the central rod (7) extending out of the crucible cover (4) is used as a clamping handle.
4. The static high-temperature molten salt corrosion test device facilitating multi-period sampling according to claim 1, wherein: the connecting piece (8) is disc-shaped, a threaded hole is formed in the center of the connecting piece and used for being matched with the central rod (7) so as to adjust the height position of the central rod (7), a plurality of through holes are distributed in the connecting piece (8) along the circumferential direction, and the branch assemblies are fixed on the through holes so as to adjust the suspension position of the sample (2) in the crucible assembly.
5. The static high-temperature molten salt corrosion test device convenient for multi-period sampling according to claim 4, characterized in that: the branch component comprises a thin sheet (10), a sleeve (11), a pin (12) and a plurality of annular blocking sheets (1);
the thin sheet (10) comprises an annular thin sheet and a rectangular thin sheet, the annular thin sheet is fixed at one end of the rectangular thin sheet, a first through hole is formed in the other end of the rectangular thin sheet, and the length of the rectangular thin sheet is longer than that of the sleeve (11);
the top end of the insertion pin (12) is provided with an end cap to prevent falling off.
6. The static high-temperature molten salt corrosion test device convenient for multi-period sampling according to claim 5, characterized in that: the annular thin sheet of the thin sheet (10) is fixed in the circumferential through hole of the connecting piece (8); the sleeve (11) is sleeved on the rectangular sheet of the sheet (10), and the contact pin (12) is inserted into the first through hole of the rectangular sheet and used for preventing the sleeve (11) from sliding out of the sheet (10); the test sample (2) is strung on the sleeve (11) through the second through hole, the test sample (2) is rectangular, the second through hole is formed in the test sample, and a circular ring baffle (1) is arranged between every two adjacent test samples (2).
7. The static high-temperature molten salt corrosion test device convenient for multi-period sampling according to claim 5, characterized in that: the sheet (10) and the contact pin (12) are made of austenitic stainless steel, and can meet the temperature condition during the test and the corrosion resistance requirement under the test environment; the sleeve (11) and the ring baffle (1) are used as the contact part of the device and the sample (2), and the materials are all ceramic, so that the test error increase caused by galvanic corrosion between different metal materials can be avoided.
8. The static high temperature molten salt decay facilitating multiple time period sampling of claim 5The corrosion test device is characterized in that: the dimensions of the cross-sectional thickness T and width W of the rectangular sheet of the sheet (10) and the inner diameter of the sleeve (11)
The following relationship should be satisfied:
so as to ensure that the sleeve (11) can be just sleeved on the rectangular sheet and cannot be loosened;
the end cap outer diameter D of the inserting needle (12), the inserting needle length L and the sleeve (11) inner diameter
Outer diameter of the sleeve (11)
Should satisfy the following relations:
，
to ensure that the pin (12) prevents the sleeve (11) from sliding out of the rectangular sheet during sampling and does not impede removal of the sample (2) from the sleeve (11).
9. The static high-temperature molten salt corrosion test device convenient for multi-period sampling according to claim 5, characterized in that: the number of through-holes in the circumferential direction of the connecting piece (8) and the sheets (10) connected with the through-holes is increased or decreased as required, and at least 2 connecting pieces (8) can be connected in series on the central rod (7) at the same time to form a multi-layer sample tree, so that the static high-temperature molten salt corrosion tests of multiple samples in different periods can be carried out in batches, and the continuity of the multiple sample tests and the consistency of the test environment can be ensured.
10. A test method of a static high-temperature molten salt corrosion test device convenient for multi-period sampling is characterized by comprising the following steps:
step 1), according to the test material type number n and the molten salt type number m, taking n ∙ m installed test devices convenient for multi-time-period sampling, wherein the materials of the test samples (2) arranged in the same device are consistent, and different materials are prevented from influencing each other in the corrosion process; fixing the sample (2) and the circular retaining sheet (1) on the sleeve (11) in sequence;
step 2), respectively putting the prepared m mixed salt solids into a muffle furnace to be heated to be in a molten state, respectively pouring the m molten salt in the molten state into the crucible assemblies in the step 1), enabling the liquid level of the molten salt to be 2cm +/-5 mm below the crucible openings, and vertically putting the connecting rod assemblies provided with different material samples (2) into each crucible to ensure that all the samples (2) are soaked in the molten salt; finally, putting all the crucible assemblies into a muffle furnace, setting the test temperature, and starting the test;
and 3) when sampling at a set time point, taking the whole testing device out of the muffle furnace, clamping a center rod (7) above the crucible cover (4) by using steel tongs, slowly lifting, taking the sample (2) to be taken out of the sleeve (11), putting the whole connecting rod assembly back into the crucible (3), and putting the whole testing device back into the muffle furnace for continuous testing.
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| CN110779856A (en) * | 2019-11-20 | 2020-02-11 | 中国核动力研究设计院 | Sample installation device and method for lead-bismuth alloy melt corrosion test |
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