Dynamic corrosion test device

Abstract

The utility model belongs to the field of dynamic corrosion of metal materials, and discloses a dynamic corrosion test device. The device comprises power supply equipment, a heating furnace and a corrosive medium container, the power supply equipment is arranged outside the heating furnace; the corrosive medium container is arranged in the heating furnace; the heating furnace is provided with temperature control equipment; the temperature control equipment is used for dynamically stabilizing the temperature of the molten corrosion medium arranged in the corrosion medium container, the temperature of the alloy sample arranged in the corrosion medium container and connected with the positive electrode of the power supply equipment and the temperature of the alloy sample arranged in the corrosion medium container and connected with the negative electrode of the power supply equipment. According to the utility model, dynamic corrosion tests of metal materials in different current densities, temperatures and corrosive media in a wide temperature range can be realized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of metal material dynamic corrosion, more particularly, relate to a kind of dynamic corrosion test device. BACKGROUND

[0002] Corrosion-resistant alloy represented by nickel-based alloy is widely used in manufacturing core components of nuclear power plant and key structures of chemical processing, and the service environment of such alloy is mostly high temperature, strong current and molten corrosive medium and other harsh environments.Corrosion performance of alloy is the key performance index of material selection in nuclear power field.

[0003] Currently, corrosion test of corrosion-resistant alloy is only studied by a few scholars, for example, Jen-Hsien Hsu et al. studied the corrosion behavior of In693 alloy in 1000℃-1190℃ iron phosphate molten glass (Jen-Hsien Hsu et al., 2013; Jen-Hsien Hsu et al., 2014); R. Halder et al. studied the corrosion behavior of In693 alloy in boric acid at 1000℃ (R. Halder et al., 2016).

[0004] The above-mentioned existing researches are mostly carried out under static conditions, only considering the influence of corrosion medium and high temperature, and lacking of alloy corrosion-resistant test device and method under dynamic conditions such as power on and flow. Therefore, the utility model designs a kind of dynamic corrosion test device. UTILITY MODEL CONTENT

[0005] The utility model aims at the shortage of prior art, and proposes a kind of dynamic corrosion test device. The utility model can realize dynamic corrosion test of metal material under different current density, temperature and corrosion medium in wide temperature range.

[0006] In order to realize the above-mentioned purpose, the utility model provides a kind of dynamic corrosion test device, the device includes power supply equipment, heating furnace and corrosion medium container;

[0007] The power supply equipment is arranged outside the heating furnace;

[0008] The corrosion medium container is arranged inside the heating furnace;

[0009] The heating furnace is provided with temperature control equipment, and the temperature control equipment is used to realize the dynamic stability of the temperature of molten corrosion medium arranged in the corrosion medium container, the temperature of alloy sample arranged in the corrosion medium container and connected with the positive pole of the power supply equipment and the temperature of alloy sample arranged in the corrosion medium container and connected with the negative pole of the power supply equipment.

[0010] Preferably, the corrosion medium container is a crucible.

[0011] Preferably, the crucible is at least one of a chrome corundum crucible, a corundum crucible, a zirconium corundum crucible and a chrome zirconium corundum crucible.

[0012] Preferably, the size of the crucible comprises: an inner diameter of 100-250mm, a height of 100-200mm.

[0013] The crucible is provided with a crucible cover, and the size of the crucible cover is a diameter of 150-300mm and a thickness of 5-10mm.

[0014] Preferably, the device further comprises a metallographic microscope.

[0015] Preferably, the device further comprises a scanning electron microscope.

[0016] Preferably, the alloy sample is in a sheet shape.

[0017] Preferably, the length of the alloy sample is 200-400mm, the width is 30-90mm, and the thickness is 5-10mm.

[0018] Preferably, the power supply device is an alternating current power supply device.

[0019] Preferably, the heating furnace is an electric resistance furnace.

[0020] The beneficial effects of the technical scheme of the utility model are as follows:

[0021] (1) The dynamic corrosion test device of the utility model can adjust the loading current, voltage and frequency, test the corrosion resistance of the alloy sample under different temperature, current density, time and corrosion medium conditions, and quantify the corrosion rate and analyze the element composition of the corrosion product.

[0022] (2) After the dynamic corrosion test of the alloy sample under different temperature, current density, time and corrosion medium conditions on the device of the utility model, the utility model also accurately measures the corrosion layer thickness of the alloy sample through an optical microscope, and characterizes the corrosion product through a scanning electron microscope.

[0023] (3) The utility model can guarantee the constant temperature of the corrosion medium in the dynamic corrosion test process through the collaborative regulation of the heating furnace and the heating furnace temperature control equipment.

[0024] (4) The utility model can be applied to the dynamic corrosion performance test of corrosion-resistant alloy, is convenient to operate, is accurate in control, reliable in data, and high in efficiency.

[0025] Other features and advantages of the utility model will be described in detail in the subsequent specific embodiment part. BRIEF DESCRIPTION OF DRAWINGS

[0026] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which like reference characters refer to the like elements throughout the figures, and in which:

[0027] Figure 1 A schematic view of a dynamic corrosion testing device is shown.

[0028] Reference signs are explained as follows:

[0029] 1 power supply device, 2 alloy sample, 3 corrosion medium container, 4 molten corrosion medium, 5 heating furnace. DETAILED DESCRIPTION

[0030] Preferred embodiments of the present application will be described in more detail below. Although the following describes preferred embodiments of the present application, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present application is more thoroughly and completely conveyed to those skilled in the art, and so that the scope of the present application is fully conveyed to those skilled in the art.

[0031] The present application provides a dynamic corrosion testing device, the device comprising a power supply device, a heating furnace and a corrosion medium container;

[0032] The power supply device is disposed outside the heating furnace;

[0033] The corrosion medium container is disposed inside the heating furnace;

[0034] The heating furnace is provided with a temperature control device for dynamically stabilizing the temperature of the molten corrosion medium disposed in the corrosion medium container, the temperature of the alloy sample disposed in the corrosion medium container and connected to the positive electrode of the power supply device, and the temperature of the alloy sample disposed in the corrosion medium container and connected to the negative electrode of the power supply device.

[0035] In the present application, "dynamic stabilization of temperature" means that the temperature of the molten corrosion medium disposed in the corrosion medium container, the temperature of the alloy sample disposed in the corrosion medium container and connected to the positive electrode of the power supply device, and the temperature of the alloy sample disposed in the corrosion medium container and connected to the negative electrode of the power supply device are constant within the range of the required temperature (900-1200℃) for the test.

[0036] In one example, the corrosion medium container is a crucible. The material and size of the crucible are determined according to the service environment of the alloy sample.

[0037] In one example, the crucible is at least one of a chrome corundum crucible, a corundum crucible, a zirconium corundum crucible, and a chrome zirconium corundum crucible.

[0038] In one example, the size of the crucible includes: an inner diameter of 100-250mm, a height of 100-200mm; the crucible is provided with a crucible cover, and the size of the crucible cover is 150-300mm in diameter and 5-10mm in thickness.

[0039] In one example, the device further comprises a metallographic microscope.

[0040] In one example, the device further comprises a scanning electron microscope.

[0041] In the utility model, according and the dynamic corrosion test device of the utility model, the size of alloy sample is designed and alloy sample is processed.In one example, the alloy sample is sheet-shaped, more preferably, the length of alloy sample is 200-400mm, the width is 30-90mm, and the thickness is 5-10mm.

[0042] In the utility model, the heating furnace is provided with a cover body, and the power line passes through the cover body of the heating furnace, so that the alloy sample connected with the positive pole of the power supply device and the alloy sample connected with the negative pole of the power supply device are inserted into the molten corrosion medium.The gas environment in the heating furnace is air.

[0043] The utility model also provides a kind of dynamic corrosion test method, the method is carried out in the device, including the following steps:

[0044] S1: the thickness of alloy sample connected with the positive pole of the power supply device and the thickness of alloy sample connected with the negative pole of the power supply device are measured and recorded;

[0045] S2: heat corrosion medium to the temperature required for test in heating furnace and keep warm, obtain molten corrosion medium;

[0046] S3: alloy sample connected with the positive pole of the power supply device and alloy sample connected with the negative pole of the power supply device are inserted into the molten corrosion medium, and power is turned on;

[0047] S4: when the temperature of the alloy sample reaches the temperature required for test, timing is carried out;After preset time is reached after timing, after-test sample is taken out, and the surface corrosion layer thickness of after-test sample is measured and the element composition analysis of surface corrosion product of after-test sample is carried out.

[0048] According to the utility model, preferably, before step S1, the method further comprises performing mechanical grinding and polishing treatment on the alloy sample to mirror surface.

[0049] In one example, the alloy sample is In693 alloy and / or Inconel 758 alloy.

[0050] In the utility model, the service environment of the alloy sample includes the type and specific substance composition of the corrosion medium. Therefore, the utility model selects the corrosion medium according to the service environment requirement of the alloy sample. In one example, the corrosion medium is at least one of borosilicate glass, iron phosphate glass and aluminosilicate.

[0051] In one example, the power supply is an alternating current power supply, and different intensity current densities are realized inside the sample by adjusting alternating voltage, and the current density is 0.5-2.0A / cm 2 , the alternating voltage is 200-400V, and the frequency is 40-80Hz.

[0052] In one example, the required temperature of the test is 900-1200 DEG C.

[0053] In one example, the preset time is 0.5-42 days.

[0054] In the utility model, according to the current requirement of the alloy dynamic corrosion test of the utility model, the related parameters of the alternating current power supply are designed, including current density, alternating voltage and frequency;According to the requirement of the required temperature of the test, the heating power, resistance wire and temperature measuring thermocouple of the heating furnace are designed.

[0055] In one example, the measurement of the surface corrosion layer thickness of the sample after the test utilizes a metallographic microscope;Further comprising calculating the average annual corrosion rate of the alloy sample through the surface corrosion layer thickness of the sample after the test.

[0056] In the utility model, the metallographic microscope can exclude the influence of the residual corrosion medium on the surface. The utility model removes the molten corrosion medium on the surface of the sample after the test to prepare into a microstructure observation sample. After the microstructure observation sample is mechanically ground and polished, the corrosion layer thickness is measured under the metallographic microscope, and the average annual corrosion rate of the alloy is calculated.

[0057] In one example, the element composition analysis of the surface corrosion product of the sample after the test utilizes a scanning electron microscope.

[0058] The present invention will be specifically described below through examples.

[0059] Example 1

[0060] This embodiment provides a dynamic corrosion testing device, such as... Figure 1 As shown, the device includes a power supply unit 1, a heating furnace 5, and a corrosive medium container 3;

[0061] The power supply device 1 is located outside the heating furnace 5; the heating furnace 5 is a resistance furnace.

[0062] The corrosive medium container 3 is disposed inside the heating furnace 5; based on the service environment of the In693 alloy sample, the corrosive medium container 3 is a chromium corundum crucible, the dimensions of which include: an inner diameter of 150 mm and a height of 150 mm; the crucible is provided with a crucible lid, the dimensions of which are: a diameter of 200 mm and a thickness of 3 mm.

[0063] The heating furnace is equipped with a temperature control device, which is used to achieve dynamic stability of the temperature of the molten corrosive medium 4 placed in the corrosive medium container 3, the temperature of the alloy sample 2 placed in the corrosive medium container and connected to the positive electrode of the power supply device, and the temperature of the alloy sample 2 placed in the corrosive medium container and connected to the negative electrode of the power supply device.

[0064] Alloy sample 2 is an In693 alloy, in sheet form, with a length of 300 mm, a width of 34 mm, and a thickness of 8.4 mm.

[0065] The apparatus also includes a metallurgical microscope (not shown) and a scanning electron microscope (not shown).

[0066] This embodiment also provides a dynamic corrosion testing method for In693 alloy at a temperature of 1000℃ and a current density of 1.0 A / cm². 2 The dynamic corrosion behavior test under molten ferrophosphate glass conditions includes the following steps:

[0067] S1: Process two alloy samples to obtain two alloy samples, each with a length of 300 mm, a width of 34 mm, and a thickness of 8.4 mm; mechanically grind the two alloy samples on 600#, 800#, 1000#, 1200#, and 2000# wet sandpaper respectively, and then polish them with 2.5 μm polishing paste until the surface is mirror-finished; then clamp the two alloy samples to the positive and negative terminals of the power supply; measure and record the thickness of the alloy sample connected to the positive terminal of the power supply and the thickness of the alloy sample connected to the negative terminal of the power supply.

[0068] S2: Pouring the molten iron phosphate glass into a chromium steel spinel crucible, and then heating the corrosion medium to 1000℃ in a heating furnace and keeping for 1 hour to obtain the molten iron phosphate glass;

[0069] S3: Inserting the alloy sample connected to the positive electrode of the power supply device and the alloy sample connected to the negative electrode of the power supply device into the molten corrosion medium, turning on the power supply, and setting the alternating voltage to 380V, the current density to 1.0A / cm 2 , and the frequency to 50Hz;

[0070] S4: When the temperature of the alloy sample reaches 1000℃, timing is started; after 7 days, the post-test sample is taken out; after removing the molten corrosion medium on the surface of the post-test sample, a microstructure observation sample is prepared; after mechanical polishing, the microstructure observation sample is observed under a metallographic microscope, the corrosion layer thickness is measured, the average annual corrosion rate of the alloy is calculated, and the element composition analysis of the surface corrosion product (oxidation product) of the post-test sample is performed by using a scanning electron microscope.

[0071] The results show that the average annual corrosion rate of the In693 alloy under the current of 1.0A / cm 2 is 1.1mm / year.

[0072] Example 2

[0073] The device of the present embodiment is different from that of Example 1 only in that:

[0074] The corrosion medium container is a corundum crucible;

[0075] The present embodiment also provides a dynamic corrosion test method, which is a test of the dynamic corrosion behavior of an In693 alloy under the condition of a molten iron phosphate glass at a temperature of 1150℃ and a current density of 2.0A / cm 2 , and includes the following steps:

[0076] S1: The same as step S1 of Example 1;

[0077] S2: Pouring the iron phosphate glass into a corundum crucible, and then heating the corrosion medium to 1150℃ in a heating furnace and keeping for 1 hour to obtain the molten iron phosphate glass;

[0078] S3: Inserting the alloy sample connected to the positive electrode of the power supply device and the alloy sample connected to the negative electrode of the power supply device into the molten corrosion medium, turning on the power supply, and setting the alternating voltage to 380V, the current density to 2.0A / cm 2 , and the frequency to 50Hz;

[0079] S4: when the temperature of the alloy sample reaches 1050 DEG C, timing is performed; after 7 days, the post-test sample is taken out; after removing the molten corrosion medium on the surface of the post-test sample after the post-test sample is taken out, a microstructure observation sample is prepared; the microstructure observation sample is mechanically polished, and then observed under a metallographic microscope to measure the corrosion layer thickness, calculate the average annual corrosion rate of the alloy, and analyze the element composition of the surface corrosion product (oxidation product) of the post-test sample by using a scanning electron microscope.

[0080] The results show that the average annual corrosion rate of the In693 alloy under the current density of 2.0 A / cm2 is 2.06 mm / year. 2 The results show that the average annual corrosion rate of the In693 alloy under the current density of 2.0 A / cm2 is 2.06 mm / year.

[0081] The results of the above embodiments show that the alloy sample dynamic corrosion test can be realized, the corrosion rate of the alloy under different dynamic corrosion parameters can be evaluated, and the corrosion product after dynamic corrosion can be characterized.

[0082] The above has described the embodiments of the utility model, the above description is exemplary, is not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A dynamic corrosion testing apparatus, characterized by, The device comprises a power supply device, a heating furnace and a corrosion medium container; The power supply device is arranged outside the heating furnace; The corrosion medium container is arranged inside the heating furnace; The heating furnace is provided with a temperature control device for dynamically stabilizing the temperature of the molten corrosion medium arranged in the corrosion medium container, the temperature of the alloy sample arranged in the corrosion medium container and connected with the positive pole of the power supply device, and the temperature of the alloy sample arranged in the corrosion medium container and connected with the negative pole of the power supply device.

2. The dynamic corrosion testing apparatus of claim 1, wherein, The corrosion medium container is a crucible.

3. The dynamic corrosion testing apparatus of claim 2, wherein, The crucible is at least one of a chrome corundum crucible, a corundum crucible, a zirconium corundum crucible and a chrome-zirconium corundum crucible.

4. The dynamic corrosion testing apparatus of claim 2, wherein, The size of the crucible includes an inner diameter of 100-250 mm and a height of 100-200 mm. The crucible is provided with a crucible cover with a size diameter of 150-300 mm and a thickness of 5-10 mm.

5. The dynamic corrosion testing apparatus of claim 1, wherein, The device further comprises a metallographic microscope.

6. The dynamic corrosion testing apparatus of claim 1, wherein, The device further comprises a scanning electron microscope.

7. The dynamic corrosion testing apparatus of claim 1, wherein The alloy sample is in the form of a sheet.

8. The dynamic corrosion testing apparatus of claim 7, wherein, The length of the alloy sample is 200-400 mm, the width is 30-90 mm, and the thickness is 5-10 mm.

9. The dynamic corrosion testing apparatus of claim 1, wherein, The power supply device is an alternating current power supply device.

10. The dynamic corrosion testing apparatus of claim 1, wherein, The heating furnace is an electric resistance furnace.

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