Alloy simulation working condition corrosion test device and method for nuclear waste glass curing smelting furnace electrode

Abstract

The invention discloses an alloy simulation working condition corrosion test device and method for a nuclear waste glass curing smelting furnace electrode, and the device comprises a heating box which is used for storing and heating a corrosion medium and an electrified sample, the electrified sample comprises a positive plate and a negative plate, and the experiment ends of the positive plate and the negative plate are immersed in the corrosion medium at intervals; according to the alloy simulated working condition corrosion test device for the nuclear waste glass curing smelting furnace electrode, the actual working condition environment is simulated through the heating box, the power supply system applies current with the current density similar to that of the actual working condition to the electrified sample, and the experiment end of the comparison sample is immersed in the corrosion medium. The corrosion performance test of the alloy for the nuclear waste glass curing smelting furnace electrode under the actual service working condition of'heat-electricity-flow 'multi-physical field simulation is realized by matching with a stirring mechanism, and a comparison sample is used as a non-electrified control group for synchronous corrosion.

Description

Technical Field

[0001] The present invention belongs to the technical field of simulated working condition corrosion test equipment for alloys used in nuclear waste glass solidification furnace electrodes, and more specifically, relates to a simulated working condition corrosion test equipment and method for alloys used in nuclear waste glass solidification furnace electrodes. Background Art

[0002] Due to its high radioactivity levels, long half-life, and high biological toxicity, the treatment and disposal of high-level radioactive liquid waste (HLW) has become a global concern. my country's HLW output is growing at a rate of 600 tons per year, yet the country still faces a storage problem. Vitrification technology is currently the most effective and mature technology for HLW disposal. Joule-heated ceramic furnace vitrification technology, with its advantages of unlimited furnace size, high glass yield per unit time, and excellent compatibility with precious metals, is currently the most advanced waste treatment method internationally. It has been listed by the Chinese Academy of Engineering as one of the "2024 Global Engineering Frontiers." Currently, only a few countries in the world have mastered this technology. Electrode alloys for nuclear waste vitrification furnaces, represented by nickel-based alloys (such as IN690 and IN693), are used in the manufacture of key functional components of vitrification furnaces in HLW disposal facilities. These alloys operate in harsh environments characterized by high temperatures, high currents, and molten glass corrosion. The alloy's resistance to molten glass corrosion under simulated operating conditions is a key performance indicator determining the lifespan of vitrification furnaces.

[0003] At present, only a few scholars have studied the corrosion tests of this type of corrosion-resistant alloys. For example, Jen-Hsien Hsu et al. studied the corrosion behavior of IN690 and IN693 alloys in iron phosphate molten glass at 1000℃~1190℃ (Jen-HsienHsu et al., 2013; Jen-Hsien Hsu et al., 2014), R. Halder et al. studied the corrosion behavior of IN693 alloy in borate at 1000℃ (R. Halder et al., 2016), Zhijian Feng et al. studied the corrosion behavior of IN690 alloy in molten salts rich in Al, Bi, Cr and other elements (Zhijian Feng et al., 2008), and Xianhe Mao et al. studied the corrosion behavior of Inconel alloys in high-temperature borosilicate glass melts simulating nuclear waste (Xianhe Mao et al., 2017). Most of the aforementioned studies were conducted under static corrosion conditions, considering only the effects of corrosive media and high temperatures. They lacked equipment and methods for testing alloy corrosion resistance under simulated operating conditions, such as current flow and flow, making it impossible to characterize the corrosion performance of such materials under actual service conditions. Therefore, the present invention designs a simulated corrosion testing apparatus with adjustable loading current and test temperature to test the corrosion resistance of corrosion-resistant alloys under conditions simulating different temperatures, times, and corrosive media flow, quantify the corrosion rate, and analyze the elemental composition of corrosion products. Summary of the Invention

[0004] The purpose of the present invention is to address the deficiencies in the prior art and provide a simulated working condition corrosion test device for alloys used in nuclear waste glass solidification furnace electrodes, so as to solve the problem that existing experiments are all carried out under static corrosion conditions, only considering the influence of corrosive media and high temperature, lacking alloy corrosion resistance test devices and methods under simulated working conditions such as power supply and flow, and unable to characterize the corrosion performance of such materials under actual service conditions.

[0005] In order to achieve the above-mentioned object, the present invention provides a simulated working condition corrosion test device for alloys used in nuclear waste glass solidification furnace electrodes, comprising: A heating box, the heating box is used to store and heat the corrosive medium; A powered sample, the powered sample comprising a positive electrode sheet and a negative electrode sheet, wherein the test ends of the positive electrode sheet and the test ends of the negative electrode sheet are immersed in the corrosive medium at intervals; a comparative sample, wherein the experimental end of the comparative sample is immersed in the corrosive medium; A stirring mechanism, the stirring mechanism is used to stir the corrosive medium to move; A power supply system, wherein the positive output terminal of the power supply system is connected to the connection terminal of the positive electrode sheet, and the negative output terminal of the power supply system is connected to the connection terminal of the negative electrode sheet.

[0006] Optionally, the heating box includes a resistance furnace, a crucible is provided in the resistance furnace, and the crucible is used to store the corrosive medium.

[0007] Optionally, the crucible is provided with a cover, the cover and the crucible form a chamber structure, the corrosive medium fills the chamber structure, and the experimental ends of the energized sample and the comparative sample respectively pass through the cover and are immersed in the corrosive medium.

[0008] Optionally, the stirring mechanism includes a bubbling tube, the gas outlet end of the bubbling tube passes through the cover or the crucible and is immersed in the corrosive medium, the corrosive medium is a molten corrosive medium, and the crucible is a chrome corundum spinel crucible.

[0009] Optionally, the immersed ends of the energized sample and the control sample do not contact the inner wall of the crucible, and the bubbling tube is arranged close to the bottom of the crucible.

[0010] Optionally, argon gas is introduced into the bubbling tube.

[0011] The present invention also provides a method for testing corrosion of alloys used in electrodes of a nuclear waste glass solidification furnace under simulated working conditions, using the aforementioned apparatus for testing corrosion of alloys used in electrodes of a nuclear waste glass solidification furnace under simulated working conditions, comprising: Prepare energized samples and comparison samples; Insert the electrified sample and the comparative sample into the molten corrosive medium; Adjust the load current of the energized sample; Adjust the temperature of the corrosive medium to keep the energized sample at a stable test temperature; After the energized sample and the comparative sample are immersed in corrosion for a predetermined time, the energized sample and the comparative sample for microstructure observation are prepared; Compare the microstructure observation of the energized sample and the microstructure observation of the comparison sample, and the differences between the two before and after corrosion.

[0012] Optionally, preparing the energized sample and the comparative sample comprises: Trim the size and shape of the energized specimen and the comparison specimen; Mechanically grind and polish the outer surfaces of the energized specimens and the control specimens.

[0013] Optionally, inserting the energized sample and the comparative sample into the molten corrosive medium comprises: Add corrosive media into the heating box; Heating the corrosive medium until it changes into a molten state; Stir the corrosive medium to make the molten corrosive medium move.

[0014] Optionally, observing and measuring the thickness of the corrosion layer using a metallographic microscope includes: Mechanically polished microstructure observation of energized specimens and microstructure observation comparison specimens; The microstructure of the electrified sample and the microstructure of the comparative sample were observed under a metallographic microscope respectively; The thickness of the corrosion layer of the microstructure observation energized sample and the microstructure observation comparison sample was measured respectively.

[0015] The present invention provides a simulated working condition corrosion test device for alloys used in nuclear waste glass solidification furnace electrodes, which has the following beneficial effects: 1. The simulated working condition corrosion test device for alloys used in electrodes of nuclear waste glass solidification melting furnaces simulates the actual working environment through a heating box. The power supply system applies a current close to the actual working condition current density to the energized sample, and cooperates with the stirring mechanism to realize the corrosion performance test of the alloys used in electrodes of nuclear waste glass solidification melting furnaces under the "heat-electricity-current" multi-physical field simulating the actual service conditions. The comparison sample is corroded simultaneously as a control group without power.

[0016] 2. The simulated working condition corrosion test method for alloys used in nuclear waste glass solidification furnace electrodes simulates the corrosion changes under actual service conditions. By performing simultaneous corrosion tests on energized and comparison samples, the thickness of the corrosion layer can be accurately measured, the elemental composition of the corrosion products can be analyzed, and the influence of the presence or absence of current on the corrosion behavior of the electrode material under simulated working conditions and its mechanism can be analyzed.

[0017] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0019] Figure 1 A schematic structural diagram of a simulated working condition corrosion test device for alloys used in nuclear waste glass solidification furnace electrodes according to one embodiment of the present invention is shown.

[0020] Figure 2 A schematic structural diagram of a powered sample of a simulated working condition corrosion test device for an alloy used in a nuclear waste glass solidification melting furnace electrode according to an embodiment of the present invention is shown.

[0021] Figure 3 The results show that the electrode of the nuclear waste glass solidification furnace according to Example 1 of the present invention is made of IN690 alloy and melts borosilicate glass at 1150°C with current densities of 0 and 1.5 A / cm 2 Scanning image of corrosion products inside the sample after 7 days of electrical corrosion.

[0022] Figure 4 The electrode of the nuclear waste glass solidification furnace according to Example 2 of the present invention is made of IN690 alloy and melts borosilicate glass at 1150°C and the current density is 1.0~3.0A / cm 2 Schematic diagram of the average annual corrosion rate below.

[0023] Description of reference numerals: 1. Power supply system; 2. Powered sample; 3. Comparative sample; 4. Cover; 5. Crucible; 6. Corrosive medium; 7. Resistance furnace; 8. Bubble tube. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. Instead, these embodiments are provided to make the present invention more thorough and complete and to fully convey the scope of the present invention to those skilled in the art.

[0025] like Figure 1-2 As shown, a simulated working condition corrosion test device for alloys used in nuclear waste glass solidification furnace electrodes comprises: Heating box, the heating box is used to store and heat the corrosive medium 6; The powered sample 2 includes a positive electrode sheet and a negative electrode sheet, and the experimental ends of the positive electrode sheet and the negative electrode sheet are immersed in the corrosive medium 6 at intervals; Comparative sample 3: the experimental end of comparative sample 3 is immersed in the corrosive medium 6; A stirring mechanism, which is used to stir the corrosive medium 6 to move; The power supply system 1 has a positive output terminal connected to the connection terminal of the positive electrode sheet, and a negative output terminal connected to the connection terminal of the negative electrode sheet.

[0026] Specifically, the power supply system 1 can adjust the current, voltage, and frequency, and introduce alternating current of different current densities into the test environment, which can simulate the current density range of 0~5A / cm when the electrodes of the nuclear waste glass solidification furnace are working. 2 The heating chamber simulates actual operating conditions, maintaining a constant high-temperature environment for material testing, reaching temperatures as high as 1200°C. This simulates the internal temperature of a nuclear waste glass solidification furnace, which ranges from 25°C to 1200°C. Power supply system 1, in conjunction with the heating chamber, applies a current close to the actual operating current density to powered sample 2. The stirring mechanism also tests the corrosion performance of the alloy used in nuclear waste glass solidification furnace electrodes under a "heat-electricity-current" multi-physics field simulation of actual service conditions. Comparative sample 3, serving as a non-powered control group, undergoes simultaneous corrosion testing.

[0027] Furthermore, the materials of the powered sample 2 and the comparative sample 3 are identical, differing only in whether they are powered. The powered sample 2 is shaped like a paddle, with the long handle end serving as the experimental and submerged end, and the paddle end serving as the connection end. The paddle body increases the size of the connected, powered area. The comparative sample 3 can be either strip-shaped or paddle-shaped, as it is not powered and can be installed in one piece.

[0028] In this embodiment, the heating box includes a resistance furnace 7 , in which a crucible 5 is arranged. The crucible 5 is used to store a corrosive medium 6 .

[0029] Specifically, the resistance furnace 7 heats the crucible 5 in the air to prevent the conduction and dissipation of the energized current.

[0030] In this embodiment, the crucible 5 is provided with a cover 4, which forms a chamber structure with the crucible 5. The corrosive medium 6 fills the chamber structure. The experimental ends of the energized sample 2 and the comparative sample 3 pass through the cover 4 and are immersed in the corrosive medium 6 respectively.

[0031] Specifically, the cover 4 cooperates with the crucible 5 to simulate a closed furnace environment.

[0032] In this embodiment, the stirring mechanism includes a bubbling tube 8, the gas outlet end of the bubbling tube 8 passes through the cover 4 or the crucible 5 and is immersed in the corrosive medium 6, the corrosive medium 6 is a molten corundum spinel crucible.

[0033] Specifically, argon gas is introduced through the bubbling tube 8 for stirring, while simulating a real working environment.

[0034] In this embodiment, the submerged ends of the powered sample 2 and the comparative sample 3 do not contact the inner wall of the crucible 5 , and the bubbling tube 8 is disposed close to the bottom of the crucible 5 .

[0035] Specifically, the energized sample 2 is heated sufficiently and current dissipation is reduced.

[0036] In this embodiment, argon gas is introduced into the bubbling tube 8 .

[0037] The present invention also provides a method for testing corrosion of alloys used in electrodes of a nuclear waste glass solidification furnace under simulated working conditions, using the aforementioned apparatus for testing corrosion of alloys used in electrodes of a nuclear waste glass solidification furnace under simulated working conditions, comprising: Prepare the energized sample 2 and the comparative sample 3; The energized sample 2 and the comparative sample 3 were inserted into the molten corrosive medium 6; Adjust the load current of energized sample 2; Adjust the temperature of the corrosive medium 6 so that the energized sample 2 maintains a stable test temperature; After the electrified sample 2 and the comparative sample 3 were immersed in corrosion for a predetermined time, they were prepared into electrified samples for microstructure observation and comparative samples for microstructure observation; Compare the microstructure observation of the energized sample and the microstructure observation of the comparison sample, and the differences between the two before and after corrosion.

[0038] In this embodiment, preparing the energized sample 2 and the comparative sample 3 includes: Trim the size and shape of the energized sample 2 and the comparative sample 3; The outer surfaces of the energized sample 2 and the comparative sample 3 were mechanically polished.

[0039] Specifically, the sizes of the energized sample 2 and the comparative sample 3 were adjusted according to experimental requirements to facilitate current density calculations. Pure mechanical polishing was used to prevent impurities from affecting the experiment. The surfaces of the energized sample 2 and the comparative sample 3 were mechanically polished to a mirror finish. After polishing, the original thickness of the samples was measured and recorded using a micrometer screw.

[0040] In this embodiment, inserting the energized sample 2 and the comparative sample 3 into the molten corrosive medium 6 includes: Adding corrosive medium 6 into the heating box; Heating the corrosive medium 6 until the corrosive medium 6 is transformed into a molten state; The corrosive medium 6 is stirred to move the molten corrosive medium 6 .

[0041] Specifically, the molten corrosive medium 6 is stirred to simulate the flow state of actual working conditions.

[0042] Furthermore, the corrosive medium 6 is kept warm for a certain period of time after being transformed into a molten state to ensure that the corrosive medium 6 is completely transformed.

[0043] In this embodiment, observing and measuring the corrosion layer thickness using a metallographic microscope includes: Mechanically polished microstructure observation of energized specimens and microstructure observation comparison specimens; The microstructure of the electrified sample and the microstructure of the comparative sample were observed under a metallographic microscope respectively; The thickness of the corrosion layer of the microstructure observation energized sample and the microstructure observation comparison sample was measured respectively.

[0044] Specifically, observations were made under a metallographic microscope, and the average annual corrosion rate of the alloy was calculated based on the thickness of the corrosion layers of the two.

[0045] Furthermore, scanning electron microscopy was used to analyze and identify the corrosion products. Corrosion depth was measured using an optical microscope to eliminate the influence of residual corrosive media on the sample surface on measurement errors. Scanning electron microscopy was also used to characterize the morphology and elemental composition of the corrosion products. This simulated operating corrosion test apparatus and method can provide technical support for corrosion performance evaluation and material improvement of electrode materials in high-level waste vitrification furnaces. A micrometer screw can also be used to assist in measurement. Example 1

[0046] like Figure 3 As shown in the figure, the IN690 alloy for the electrode of the nuclear waste glass solidification furnace is used at a simulated working temperature of 1150℃ and a current density of 1.5A / cm 2 Corrosion behavior testing of dynamic melting borosilicate glass.

[0047] (1) The main parameters of the corrosion test device are designed as follows: the AC voltage of the power supply system 1 is 380V, the current density is 1.5A / cm 2 , frequency is 50Hz.

[0048] (2) According to the service environment requirements of IN690 alloy, the crucible 5 used is a chrome corundum spinel crucible, and the dimensions of the crucible 5 are: inner diameter of 150 mm, height of 150 mm, crucible 5 cover size of 150 mm in diameter, thickness of 3 mm, and the internal corrosive medium 6 is borosilicate glass.

[0049] (3) According to the corrosion test device and crucible 5 of step (1) and step (2), the sample size is designed and the sample is processed; the long handle end of the energized sample 2 is 278 mm long and 8.5 mm wide; the slurry end is 35 mm wide and 35 mm long, and the sample thickness is 8.4 mm; the comparison sample 3 is 278 mm long, 34 mm wide, and 8.4 mm thick.

[0050] (4) The energized sample 2 and the comparative sample 3 processed in step (3) were mechanically ground on 600#, 800#, 1000#, 1200#, and 2000# water-abrasive sandpaper, respectively, and then polished with a polishing paste with a particle size of 2.5μm until the surface was mirror-finished.

[0051] (5) Pour the borosilicate glass from step (2) into the crucible 5, then place it in the resistance furnace 7 and heat it to 1150°C and keep it there for 1 hour until the borosilicate glass melts. After the borosilicate glass is completely melted, insert the bubbling tube 8 and introduce gas at a flow rate of 10 L / min to cause the molten corrosive medium 6 to flow.

[0052] (6) The positive electrode and negative electrode of the energized sample 2 prepared in step (3) are clamped to the positive electrode and negative electrode of the power supply system 1 in step (1). The connected energized sample 2 and the comparative sample 3 are simultaneously inserted into the molten corrosive medium 6 in step (5), and the current density is adjusted to 1.5 A / cm 2 .

[0053] (7) When the temperature of the energized sample 2 and the comparative sample 3 in step (6) reaches 1150°C, the time is started. After 7 days, the samples are taken out and the molten corrosive medium 6 on the surface of the energized sample 2 and the comparative sample 3 is removed. Then, the energized sample for microstructure observation and the comparative sample for microstructure observation are prepared.

[0054] (8) The microstructure observation energized sample and the microstructure observation comparison sample obtained in step (7) are mechanically ground and polished, and then observed under a metallographic microscope after grinding and polishing, and the thickness of the corrosion layer is measured to calculate the average annual corrosion rate of the alloy.

[0055] (9) At the same time, the oxidation products after corrosion were analyzed by scanning electron microscopy.

[0056] The results show that IN690 alloy for glass solidification furnace electrodes can be used at a temperature of 1150℃ and a load of 1.5A / cm 2 The average annual corrosion rate under current is 1.65 mm / year, and the corrosion product after corrosion is a sparse Cr2O3 layer. Example 2

[0057] like Figure 4 As shown in the figure, the IN690 alloy used for the electrode of the nuclear waste glass solidification furnace is used under the simulated working conditions of temperature 1150℃ and current density 1.0~3.0A / cm 2 Corrosion behavior testing of dynamic melting borosilicate glass.

[0058] (1) The main parameters of the corrosion test device are designed as follows: the AC voltage of the power supply system 1 is 380 V, the current density is 1.0 A / cm 2 , 2.0A / cm 2 , 3.0A / cm 2 , frequency is 50Hz.

[0059] (2) According to the service environment requirements, the crucible 5 used is a chrome corundum spinel crucible, and the dimensions of the crucible 5 are: inner diameter of 150 mm, height of 150 mm, crucible 5 cover size of 150 mm in diameter, thickness of 3 mm, and the internal corrosive medium 6 is borosilicate glass.

[0060] (3) According to the dynamic corrosion test device and crucible 5 of step (1) and step (2), the sample size is designed and the sample is processed; the long handle end of the energized sample 2 is 278 mm long and 8.5 mm wide; the slurry end is 34 mm wide and 34 mm long, and the sample thickness is 8.4 mm; the comparison sample 3 is 278 mm long, 34 mm wide, and 8.4 mm thick.

[0061] (4) The samples processed in step (3) were mechanically ground on 600#, 800#, 1000#, 1200#, and 2000# water-abrasive sandpaper, and then polished with a 2.5μm polishing paste until the surface was mirror-finished.

[0062] (5) Pour the borosilicate glass from step (2) into the crucible 5, then place it in the resistance furnace 7 and heat it to 1150°C and keep it there for 1 hour until the borosilicate glass melts. After the borosilicate glass is completely melted, insert the bubbling tube 8 and introduce gas at a flow rate of 10 L / min to cause the molten corrosive medium 6 to flow.

[0063] (6) Clamp the sample prepared in step (3) to the positive and negative electrodes of the power supply system 1 in step (1). Insert the connected energized sample 2 into the molten corrosive medium 6 in step (5) and adjust the current density to 1.0~3.0 A / cm 2 .

[0064] (7) When the temperature of the energized sample 2 and the comparative sample 3 in step (6) reaches 1150°C, the time is counted. After 7 days, the samples are taken out and the molten corrosive medium 6 on the surface of the samples is removed. Then, samples are prepared for microstructure observation.

[0065] (8) The sample obtained in step (7) is mechanically polished, observed under a metallographic microscope, and the thickness of the corrosion layer is measured to calculate the annual corrosion rate of the alloy under dynamic corrosion conditions.

[0066] The results show that IN690 alloy for glass solidification furnace electrodes can be used at a temperature of 1150℃ and a current of 1.0~3.0A / cm 2 The average annual corrosion rate under current is 0.9~2.5mm / year. With the increase of current density, the size loss rate increases. The corrosion product after dynamic corrosion is Cr2O 3。 Example 3

[0067] The IN690 alloy for the melting furnace electrode was solidified by nuclear waste glass under simulated working temperature of 1150℃ and current density of 1.5A / cm 2 Corrosion behavior of static molten borosilicate glass.

[0068] (1) The main parameters of the corrosion test device are designed as follows: power supply system 1 AC voltage is 380V, current density is 1.5A / cm 2 , frequency is 50Hz.

[0069] (2) According to the service environment requirements of IN690 alloy, the crucible 5 used is a chrome corundum spinel crucible, and the dimensions of the crucible 5 are: inner diameter of 150 mm, height of 150 mm, crucible 5 cover size of 150 mm in diameter, thickness of 3 mm, and the internal corrosive medium 6 is borosilicate glass.

[0070] (3) According to the corrosion test device and crucible 5 of step (1) and step (2), the sample size is designed and the sample is processed; the long handle end of the energized sample 2 is 278 mm long and 8.5 mm wide; the slurry end is 35 mm wide and 35 mm long, and the sample thickness is 8.4 mm; the comparison sample 3 is 278 mm long, 34 mm wide, and 8.4 mm thick.

[0071] (4) The samples processed in step (3) were mechanically ground on 600#, 800#, 1000#, 1200#, and 2000# water-abrasive sandpaper, and then polished with a 2.5μm polishing paste until the surface was mirror-finished.

[0072] (5) The borosilicate glass prepared in step (2) is poured into the crucible 5, and then placed in the resistance furnace 7 for heating to 1150°C and kept at this temperature for 1 hour until the borosilicate glass is melted.

[0073] (6) Clamp the sample prepared in step (3) to the positive and negative electrodes of the power supply system 1 in step (1). Insert the connected energized sample 2 and the comparative sample 3 into the molten corrosive medium 6 in step (5) at the same time, and adjust the current density to 1.5 A / cm 2 .

[0074] (7) When the temperature of the energized sample 2 and the comparative sample 3 in step (6) reaches 1150°C, the time is counted. After 7 days, the samples are taken out and the molten corrosive medium 6 on the surface of the samples is removed. Then, samples are prepared for microstructure observation.

[0075] (8) After mechanical grinding and polishing, the sample obtained in step (7) is observed under a metallographic microscope and the thickness of the corrosion layer is measured to calculate the average annual corrosion rate of the alloy.

[0076] The results show that IN690 alloy for glass solidification furnace electrodes is 2 The average annual corrosion rate in the electrostatic molten state of the corrosive medium 6 is 1.25 mm / year.

[0077] While various embodiments of the present invention have been described above, the above description is intended to be illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A simulated working condition corrosion test device for alloys used in nuclear waste glass solidification furnace electrodes, characterized in that: include: A heating box, the heating box is used to store and heat the corrosive medium; A powered sample, the powered sample comprising a positive electrode sheet and a negative electrode sheet, wherein the test ends of the positive electrode sheet and the test ends of the negative electrode sheet are immersed in the corrosive medium at intervals; a comparative sample, wherein the experimental end of the comparative sample is immersed in the corrosive medium; A stirring mechanism, the stirring mechanism is used to stir the corrosive medium to move; A power supply system, wherein the positive output terminal of the power supply system is connected to the connection terminal of the positive electrode sheet, and the negative output terminal of the power supply system is connected to the connection terminal of the negative electrode sheet; The heating box includes a resistance furnace, a crucible is arranged in the resistance furnace, and the crucible is used to store the corrosive medium; The crucible is provided with a cover, the cover and the crucible form a chamber structure, the corrosive medium fills the chamber structure, and the experimental ends of the energized sample and the comparative sample respectively pass through the cover and are immersed in the corrosive medium; The stirring mechanism includes a bubbling tube, the gas outlet end of the bubbling tube passes through the cover or the crucible and is immersed in the corrosive medium, the corrosive medium is a molten corrosive medium, and the crucible is a chrome corundum spinel crucible; The immersed ends of the energized sample and the comparative sample do not contact the inner wall of the crucible, and the bubbling tube is arranged close to the bottom of the crucible; Argon is introduced into the bubbling tube; The resistance furnace heats the crucible in the air to prevent the conduction and dissipation of the electric current.

2. A method for testing corrosion of alloys used in electrodes of nuclear waste glass solidification furnaces under simulated working conditions, using the apparatus for testing corrosion of alloys used in electrodes of nuclear waste glass solidification furnaces according to claim 1, characterized in that: include: Prepare energized samples and comparison samples; Insert the electrified sample and the comparative sample into the molten corrosive medium; Adjust the load current of the energized sample; Adjust the temperature of the corrosive medium to keep the energized sample at a stable test temperature; After the energized sample and the comparative sample are immersed in corrosion for a predetermined time, the energized sample and the comparative sample for microstructure observation are prepared; Compare the microstructure observation of the energized sample and the microstructure observation of the comparison sample, and the differences between the two before and after corrosion.

3. A simulated working condition corrosion test method for alloys used in nuclear waste glass solidification furnace electrodes according to claim 2, characterized in that: The preparation of the energized sample and the comparative sample comprises: Trim the size and shape of the energized specimen and the comparison specimen; Mechanically grind and polish the outer surfaces of the energized specimens and the control specimens.

4. A simulated working condition corrosion test method for alloys used in nuclear waste glass solidification furnace electrodes according to claim 2, characterized in that: The step of inserting the energized sample and the comparative sample into the molten corrosive medium comprises: Add corrosive media into the heating box; Heating the corrosive medium until it changes into a molten state; Stir the corrosive medium to make the molten corrosive medium move.

5. A simulated working condition corrosion test method for alloys used in nuclear waste glass solidification furnace electrodes according to claim 2, characterized in that: Use a metallographic microscope to observe and measure the thickness of the corrosion layer, including: Mechanically polished microstructure observation of energized specimens and microstructure observation comparison specimens; The microstructure of the electrified sample and the microstructure of the comparative sample were observed under a metallographic microscope respectively; The thickness of the corrosion layer of the microstructure observation energized sample and the microstructure observation comparison sample was measured respectively.

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