A high-throughput method for detecting corrosion performance of an alloy material

Abstract

The application discloses a high-throughput detection method for corrosion performance of alloy materials, and comprises the following steps: A, preparing a plurality of low-alloy steel high-throughput samples containing preset components and different contents through selective laser melting; B, arranging the low-alloy steel high-throughput samples according to a preset component and an arrangement rule to prepare a wire electrode and a residual sample; assembling the wire electrode in a gradient order in a multi-hole array mold to form an array electrode, and performing twice cold setting; C, connecting each wire electrode to measure each wire electrode in a point-by-point switching mode; and D, sequentially performing electrochemical testing on each wire electrode, performing component characterization on the residual sample in step B, and establishing a corresponding relationship between test data and corresponding chemical components. The application combines a selective laser melting high-throughput preparation method with an array electrode scanning technology to realize rapid preparation and characterization of high-throughput samples.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal material performance detection, and in particular to a high-throughput detection method for corrosion performance of alloy materials. BACKGROUND

[0002] Steel materials generally face atmospheric corrosion problems in service environments, and their corrosion resistance is closely related to the types and contents of alloying elements. Early research mainly relied on long-term outdoor exposure tests to improve weather resistance by adding small amounts of Cu, P, Cr, Ni and other elements to steel. However, this type of experimental method based on a large amount of smelting and trial and error has defects such as high cost and low efficiency.

[0003] With the proposal of high-throughput experimental concept, the efficiency of material research and development has been significantly improved. High-throughput preparation technology can obtain compositionally gradient continuous or discrete distributed samples in a short time, providing the possibility for rapid performance screening of multi-component alloys. Among them, selective laser melting (SLM) as an advanced laser additive manufacturing method, not only can efficiently prepare compositionally gradient samples, but also can break through the size limitation of samples, creating conditions for in-depth electrochemical characterization.

[0004] However, high-throughput preparation must be matched with high-throughput characterization methods, otherwise it is difficult to exert the overall efficiency advantage. Conventional electrochemical methods (such as polarization curve, electrochemical impedance spectroscopy) rely on one-by-one electrode testing, which is long in cycle and limited in efficiency. Array electrode scanning method is based on the principle of micro-element, which can obtain electrochemical information through a large number of wire electrode at the same time, and is a relatively efficient means. However, in the existing technology, array electrodes are mostly prepared based on homogeneous materials, which is difficult to meet the rapid comparison of different alloy compositions, and lacks effective connection with high-throughput preparation technology.

[0005] CN107655814A proposes a high-throughput corrosion performance detection method based on array electrodes, but does not solve the problem of how to efficiently obtain a large number of gradient chemical composition samples, limiting its application range. Therefore, there is an urgent need for a comprehensive technical solution that can simultaneously solve the high-throughput sample preparation and characterization, so as to efficiently evaluate the influence of multi-component alloys on corrosion resistance. SUMMARY

[0006] Based on the deficiencies of the above prior art, the present application provides a high-throughput detection method for corrosion performance of alloy materials, which combines selective laser melting high-throughput preparation method with array electrode scanning technology to realize rapid preparation and characterization of high-throughput samples.

[0007] To solve the above technical problems, the present application discloses a high-throughput detection method for corrosion performance of alloy materials, which comprises:

[0008] A. Preparing a plurality of low-alloy steel high-throughput samples containing preset components and different contents by selective laser melting;

[0009] B. Arranging the low-alloy steel high-throughput samples according to preset components and arrangement rules to prepare a wire bundle electrode and a residual sample; assembling the wire bundle electrode in a gradient order in a multi-hole array mold to form an array electrode, and performing cold setting twice;

[0010] C. Connecting each wire bundle electrode to measure each wire bundle electrode in a point-by-point switching manner;

[0011] D. Sequentially performing electrochemical tests on each wire bundle electrode, performing component characterization on the residual sample of step B, and establishing a corresponding relationship between the test data and the corresponding chemical components.

[0012] In some embodiments, at least two low-alloy steel powders with different chemical components are placed in separate hoppers in step A, and a gradient powder feeding is used to realize discrete or continuous component gradient distribution of the wire bundle electrode.

[0013] In some embodiments, when the wire bundle electrode is removed from the substrate by wire cutting in step B, a residual sample is reserved for each wire bundle electrode, which is used for chemical component detection and maintains a corresponding relationship with the wire bundle electrode.

[0014] In some embodiments, in the two cold settings of step B, the mass ratio of epoxy resin to curing agent is 2:1 in the first cold setting, and the epoxy resin is submerged in the wire bundle electrode by 2-4 mm, and the epoxy resin is higher than the working end of the electrode and lower than the positioning mold; the second cold setting is used to cover and package the connection area of the wire bundle electrode and the electrochemical test interface.

[0015] In some embodiments, in step C, the wire bundle electrode is connected to a female-to-female color arrangement wire, the female-to-female color arrangement wire is connected to a DB50 multi-pin data line, and the connection is grouped in groups of every 10 wires.

[0016] In some embodiments, in step A, a rectangular base is arranged below the wire bundle electrode, which is used to fix the wire bundle electrode.

[0017] In some embodiments, in step D, the electrochemical test uses a three-electrode system, the array electrode as the working electrode, the reference electrode as a saturated calomel electrode, the counter electrode as a platinum sheet, and the electrolyte as a 0.3 wt.% NaCl solution; the array electrode is immersed in the electrolyte for not less than 25 minutes before starting the electrochemical test.

[0018] In some embodiments, the wire electrode in step A comprises an upper end and a lower end; the upper end comprises a conductive section with a first diameter, and the lower end comprises a working section with a second diameter, and the first diameter is smaller than the second diameter.

[0019] In some embodiments, in step A, the upper end of the wire electrode is fixed in a fixed mold.

[0020] In some embodiments, the height of the residual sample is 2-3 mm.

[0021] Compared with the prior art, the present application has the beneficial effects that:

[0022] The present application provides a high-throughput detection method for the corrosion performance of alloy materials, which comprises the following steps: preparing a high-throughput sample of low-alloy steel with clear composition difference by selective laser melting, forming an array electrode by combining a porous mold and a twice cold-embedding process, performing electrochemical testing by point-by-point switching, and finally establishing a corresponding relationship between the test data and the composition representation of the wire electrode. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 A flowchart of the high-throughput detection method for the corrosion performance of alloy materials provided by the present application;

[0024] Figure 2 A first schematic diagram of the wire electrode in the high-throughput detection method for the corrosion performance of alloy materials provided by the present application;

[0025] Figure 3 A second schematic diagram of the wire electrode in the high-throughput detection method for the corrosion performance of alloy materials provided by the present application;

[0026] In the figure: 1, fixed mold; 2, wire electrode; 3, wire cutting direction; 4, rectangular base. DETAILED DESCRIPTION

[0027] In order to better understand and implement, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0028] The terms "comprising" and "having" and any variations thereof herein are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or apparatus that comprises a list of steps or modules as non- limiting examples, can include not only those steps or modules that are expressly listed, but also other steps or modules that are inherent in such process, method, product or apparatus.

[0029] Embodiments of the present application disclose a high-throughput detection method for corrosion performance of alloy materials, which combines a selective laser melting high-throughput preparation means with an array electrode scanning technology to realize rapid preparation and characterization of high-throughput samples.

[0030] As shown in Figure 1 , the method comprises:

[0031] A, a plurality of low-alloy steel high-throughput samples containing preset components and different contents are prepared by selective laser melting.

[0032] Low-alloy steel refers to an alloy steel with a total content of alloying elements less than 5%. The low-alloy steel high-throughput sample refers to a plurality of small-size wire electrode samples prepared by selective laser melting process at one time, which are basically consistent in size, but different in chemical composition. In order to obtain different chemical composition ratios, at least two low-alloy steel powders are placed in independent hoppers, and the chemical composition is continuously or discretely changed during the forming process by gradient powder feeding, so that the wire electrode samples containing preset elements and different contents are obtained in the same batch preparation.

[0033] The wire electrode sample not only serves as a working electrode for subsequent electrochemical tests, but also has an integral cuboid base part below it, which can be used for composition characterization, so as to ensure that each wire electrode 2 corresponds to the corresponding chemical composition data. The rectangular base is used to fix the remaining wire electrode 2, prepare the sample for testing the chemical composition, and reduce the difficulty of sample preparation.

[0034] After a series of start-up preparation work such as leveling by powder laying equipment scraper and argon protection, the laser light source of the equipment is turned on, and the forming is started according to the parameters set in advance. The plurality of wire electrodes 2 with different compositions obtained in this way are low-alloy steel high-throughput samples. In some embodiments, the process parameters of the selective laser melting process can be set as a scanning speed v =100~600 mm / s, a scanner power P =50~400 W, and a scanning interval and layer thickness of 0.07~0.1 mm and 0.02~0.04 mm, respectively. The specific process parameters can be determined by experimental test according to the actual material, which is not limited in the present application.

[0035] In some embodiments, the substrate is placed in the work chamber, the scraper of the powder spreading device is leveled, the work chamber door is closed, argon is filled for protection, the oxygen content in the chamber is reduced to below 1000 ppm by opening the gas circulation system, and the powder spreading device is manually controlled. After the oxygen content is maintained at a specified level, the gas circulation mode is changed to adapt to the forming process. When argon is filled for protection and the oxygen content in the chamber is reduced, the gas circulation mode provides a large air speed to accelerate air flow and quickly reduce the oxygen content. When the processing officially starts, the powder bed on the substrate surface has been spread, and excessive air speed will damage the powder bed, so the gas circulation mode is adjusted to ensure that the powder bed is not damaged by a lower air speed, while removing impurities or spheroidization accumulated on the surface during printing to improve the forming quality.

[0036] A powder bed with a corresponding content distribution can be obtained for each powder spreading, and the number of powder spreading can be set to 1-3 times, preferably 2 times in this application, so as to form a material structure with gradually changing composition during forming. For different alloy systems, the number of powder spreading will not change even if the number of metals is increased, and the final composition gradient mainly depends on the added powder composition and its ratio. The base of the formed model is scanned twice to start, so that the formed model can be tightly connected with the substrate. After the related preparation is completed, the processing is started, and a high-throughput sample with a discrete composition gradient is obtained after the processing is completed, and the composition and content are increased or decreased according to the gradient direction.

[0037] B. The low-alloy steel high-throughput samples are arranged according to the arrangement rule according to the preset composition, a wire electrode is prepared, the wire electrode is assembled in the porous array mold according to the gradient order to form an array electrode, and cold setting is performed twice;

[0038] The low-alloy steel high-throughput sample obtained by selective laser melting cannot be distinguished by the naked eye. In order to distinguish, the low-alloy steel high-throughput sample is fixed on the base, and then all the low-alloy steel high-throughput samples are taken down by wire cutting processing, and arranged on the base according to the arrangement rule in step A.

[0039] The wire electrode 2 includes an upper end and a lower end. The upper end includes a conductive section with a first diameter, and the lower end includes a working section with a second diameter, and the first diameter is smaller than the second diameter. In this application, the first diameter is 0.7 mm, and the second diameter is 1.2 mm. Φ1 The wire electrode 2 includes an upper end and a lower end. The upper end includes a conductive section with a first diameter, and the lower end includes a working section with a second diameter, and the first diameter is smaller than the second diameter. In this application, the first diameter is 0.7 mm, and the second diameter is 1.2 mm. Φ21 mm. Due to the large number of wire electrodes 2 and their small size, they cannot be removed manually after being fixed on the metal substrate after additive manufacturing processing, and generally need to be sampled by wire cutting processing. However, since each wire electrode is almost identical in appearance, direct cutting sampling can easily cause sample order confusion and make it impossible to distinguish their corresponding relationship. Therefore, when wire cutting processing is performed, a fixed mold 1 is provided above the wire electrodes to maintain the relative position and order of the wire electrodes during cutting, thereby ensuring that the samples can still be arranged in the original gradient order after sampling, improving the sample preparation efficiency.

[0040] To ensure that the order of each wire electrode is not disturbed during sampling, a fixed mold 1 as shown in Figure 2 is needed to position above the wire electrodes. A rectangular base 4 is integrally formed below the wire electrodes 2, which can retain a certain height of residual samples after wire cutting. The residual samples can be used for chemical composition detection, thereby ensuring that each wire electrode can establish a corresponding relationship with the actual chemical composition information. Since there may be element burning or uneven powder mixing during additive manufacturing, the actual composition gradient obtained may differ from the preset value, so the actual composition of the electrode needs to be confirmed by characterizing the composition of the base residual sample. By adding a cuboid base below the electrode, the difficulty of preparing the chemical composition test sample is reduced, and the consistency of the electrode and the composition information is ensured.

[0041] Subsequently, a wire cutting machine is used to cut from below the wire electrodes along the wire cutting direction 3 as shown in Figure 2 , and all wire electrodes are sequentially removed. During cutting, a residual sample with a height of 2-3 mm is retained as a sample for subsequent chemical composition testing. In this way, the wire electrodes removed are in one-to-one correspondence with the residual samples below, ensuring that each wire electrode can correspond to accurate chemical composition data. After surface polishing, the removed wire electrodes are arranged in the original order.

[0042] The removed wire electrodes are polished to remove oxidation or rust, and are arranged in the order of the composition gradient of the preset composition system, and are then inserted into the small holes of the multi-hole array mold, which are distributed as 10x10 as shown in Figure 3 .

[0043] In some embodiments, after assembly is complete, the epoxy resin is mixed with the curing agent in a mass ratio of 2:1, poured into a cold inlay mold with a diameter of 50 mm for the first cold inlay, and the array mold with the inserted bundle electrodes is buckled to allow the mixed epoxy resin to submerge the bundle electrodes by about 3 mm. In this process, the electrodes maintain the established order and are kept at a distance from the upper array mold to avoid the mold from being unable to be recovered after the epoxy resin solidifies. After the epoxy resin is completely cured, the array mold is removed, and the bundle electrodes are sequentially connected with the socket-type flexible flat cable.

[0044] After the above connection is completed, the uniformly mixed epoxy resin is poured into the cold inlay mold for the second cold inlay, and at this time the epoxy resin needs to submerge the close contact area between the bundle electrodes and the interface to achieve reliable sealing. After the second inlay is completely cured, the working surface of the array electrode is polished until the surface reaches the first preset accuracy, which can be used for electrochemical testing; if used for composition detection, the sample working surface needs to be further polished to the second preset accuracy and polished to obtain a more smooth surface. The array electrode sample thus prepared can be directly applied to subsequent electrochemical testing and chemical composition characterization.

[0045] C. Connect each of the bundle electrodes in the array electrode, and measure each of the bundle electrodes in a point-by-point switching manner.

[0046] After the preparation of the array electrode is completed, the array electrode is connected with the data acquisition device. The flexible flat cable with a socket-type interface at one end is connected with the side connector of the DB50 multi-pin data line. To ensure reliable contact, epoxy resin is used to fix and inlay the connection area, and after curing, the electrode cable can be recycled. Subsequently, the socket interface at the other end of the array electrode is connected with the connector of the flexible flat cable in sequence, and is grouped in a manner of every 10 wires. To further ensure stable connection, electrical tape can be used to reinforce the outside of the interface. Since the testing process of the array electrode is a point-by-point switching measurement, rather than simultaneous data acquisition by multiple electrodes, there is no significant mutual influence between the electrodes; under the condition of stable double-layer, the difference in a short period of time during data acquisition can be ignored.

[0047] After the above connection is completed and cured by epoxy resin, the other side connector of the DB50 multi-pin data line is connected with the corresponding interface on the array electrode scanner, and the remaining data lines are connected according to the normal connection rules of the device, thereby realizing the electrical connection between the array electrode and the testing device.

[0048] D. Each bundle electrode is sequentially subjected to electrochemical testing, the composition of the residual sample in step B is characterized, and the test data and the corresponding chemical composition are correlated.

[0049] According to the conventional electrochemical test method, a 0.3 wt.% NaCl solution is selected as the electrolyte to simulate the coastal atmospheric corrosion environment. The array electrode is immersed in the solution in the electrolytic cell, the reference electrode cable is connected with the saturated calomel electrode, and the saturated calomel electrode is usually used as the reference electrode in the normal temperature aqueous solution system; the counter electrode cable is connected with the platinum plate. To ensure the stability of the system, the array electrode is immersed in the solution for 30 min before testing, and the electrode potential between each wire electrode with different chemical compositions and the reference electrode is obtained in sequence.

[0050] After the electrode potential test is completed, the relevant cables are reconnected, switched to the current test mode, and the galvanic current between each wire electrode with different chemical compositions and the counter electrode is measured in sequence. In practical application, the collected data can be plotted into a chart, and the more reasonable chemical composition interval can be screened according to the difference of the galvanic current values. At the same time, the residual sample remaining in step B is analyzed for chemical composition by the energy spectrometer equipped with the scanning electron microscope, so as to obtain the actual composition information corresponding to each wire electrode, and the correspondence between the electrochemical performance and the chemical composition is established.

[0051] The following takes Fe-Cu (Cu content: 0.68 wt.%) and Fe-Ni (Ni content: 1.07 wt.%) as examples to explain and illustrate the method.

[0052] A, with the help of Longyuan AFS-M120X gradient powder supply zone laser melting 3D printer, a low alloy steel high-throughput sample with gradient distribution of Cu and Ni content is obtained.

[0053] The Fe-Cu and Fe-Ni low alloy steel powders are respectively added into the respective hoppers, and the C content in the two powders is about 0.12 wt.%. The component gradient that can be obtained by adding powders with different chemical compositions. Generally, the mixing ratio of the two powders is about 1:1, and the distribution accuracy of the continuous gradient composition needs to be characterized and judged according to the obtained sample.

[0054] The wire electrode model as shown in Figure 2 is imported, the upper end of the wire electrode, that is, the conductive section Φ1 = 0.7 mm, and the electrode diameter of the lower end, that is, the working section Φ2 = 1 mm. To ensure smooth sampling and subsequent chemical composition of all samples, a cuboid base model is added below the fixed wire electrode, with a size of 116 mm×2 mm×2 mm.

[0055] The following selective laser melting process parameters are set: scanning speed is 400 mm / s, laser power is 140 W, scanning interval is 0.09 mm, and layer thickness is 0.03 mm. The specific values of the above parameters need to be adjusted through experiments according to the material composition and equipment performance to ensure that the sample can be successfully formed and reach the required density.

[0056] Before processing, the substrate in the working chamber is cleaned, and the scraper of the powder laying device is leveled, then the working chamber door is closed and argon is filled, and the gas circulation system is started to reduce the oxygen content in the chamber to below 1000 ppm. After the oxygen content is reduced to the specified level, the gas circulation mode is adjusted to avoid damaging the powder bed during the forming process due to excessive gas flow, while ensuring that surface impurities can be removed during printing to improve the forming quality. In this embodiment, manual control equipment is used for two powder laying operations, and each powder laying can obtain a gradient distribution powder bed composed of Fe-Cu powder and Fe-Ni powder. The number of powder laying is not limited to 2 times, and can also be 1 time or 3 times. After the powder laying is completed, the current page scanning is started twice to form a model base, so that the subsequent formed sample is tightly combined with the substrate. After the above preparation is completed, laser processing is started, and finally a high-throughput sample of the Fe-Cu-Ni system is obtained, and the composition gradient shows that the Cu content gradually decreases and the Ni content gradually increases.

[0057] B, according to the preset composition, the high-throughput sample of the Fe-Cu-Ni system is arranged according to the arrangement rule to prepare a wire electrode; the wire electrode is assembled in the multi-hole array mold according to the gradient order to form an array electrode, and cold setting is performed twice.

[0058] The small-size wire electrodes of different chemical compositions obtained by selective laser melting method are almost completely consistent in appearance. In order to avoid the order confusion in the sampling process, a fixing mold needs to be arranged above the wire electrode for positioning, as shown in Figure 2 . Then, the wire electrode is cut from below using a wire cutting machine tool, and 2-3 mm of residual sample is reserved during cutting. After the removed wire electrode is polished to remove the oxide skin or rust, and is arranged in sequence according to the composition gradient of the Fe-Cu-Ni system, the wire electrode is inserted into the small holes of the array electrode mold, and the small holes are distributed in a 10x10 matrix. The assembly effect is shown in Figure 3 .

[0059] After the assembly is completed, the epoxy resin and the curing agent are mixed in a mass ratio of 2:1, and then poured into a cold setting mold with a diameter of 50 mm. At the same time, the array electrode mold is buckled, so that the epoxy resin is submerged in the wire electrode by about 3 mm, and the electrode is kept in the original order and maintains a gap with the upper mold to prevent the mold from being taken out after the epoxy resin is cured. After the resin is cured, the array electrode mold is removed, and then the wire electrode is connected with the flexible flat cable in sequence.

[0060] After the above connection is completed, the mixed and uniform epoxy resin is poured into the cold inlay mold again for a second inlaying, at which time the resin should cover and seal the contact area of the wire bundle electrode and the interface to ensure reliable connection. After complete curing, the working surface of the array electrode is polished to 800# accuracy, and can be used for electrochemical testing; if used for chemical composition characterization, further polishing to 2000# and polishing are required. Through the above steps, a high-throughput sample of the array electrode suitable for Fe-Cu-Ni system low alloy steel is obtained.

[0061] C. connecting each of the wire bundle electrodes, and measuring each of the wire bundle electrodes in a point-by-point switching mode;

[0062] After the array electrode is prepared, it needs to be connected with a data acquisition device. Specifically, a flexible flat cable with a plug interface at one end is first connected to the side connector of the DB50 multi-pin data line, and epoxy resin is applied at the interface for fixation. After curing, a reliable connection is formed, and the electrode cable can be recycled. Subsequently, the socket interface at the other end of the array electrode is connected to the connector of the flexible flat cable in turn, and is arranged in groups of every 10 wires. To ensure stable contact, electrician tape can be wrapped around the connection for reinforcement. Since the test process of the array electrode is in a point-by-point switching mode, the electrodes are measured individually in sequence, so there is no interference between the electrodes, and the data difference in a short period of time under stable double-layer conditions can be ignored.

[0063] After the above connection is completed and the epoxy resin is cured, the other end connector of the DB50 data line is connected to the corresponding interface on the CST520 array electrode scanner, and the remaining data lines are connected to the device in the conventional manner.

[0064] D. sequentially performing electrochemical testing on each wire bundle electrode, performing composition characterization on the residual sample of step B, and establishing a corresponding relationship between the test data and the corresponding chemical composition.

[0065] After the electrical connection is completed, an electrochemical test system is built, and a 0.3 wt.% NaCl solution is selected as the electrolyte to simulate the coastal atmospheric environment. The array electrode is immersed in the electrolytic cell, the reference electrode cable is connected to a saturated calomel electrode, which is a commonly used reference electrode at room temperature, and the counter electrode cable is connected to a platinum electrode, thereby forming a complete three-electrode test system.

[0066] After the setup of the electrolytic cell, the array electrode is immersed in the electrolyte for 30 min to stabilize the system, and then the test is started to obtain the electrode potential between each different chemical composition filament electrode and the reference electrode in turn. After the electrode potential test is completed, the relevant cable is reconnected, switched to the current test mode, and the galvanic current between each different chemical composition filament electrode and the counter electrode is measured in turn. In practical application, the collected data can be plotted into a chart, and the reasonable alloy composition interval is screened according to the difference of the galvanic current value. At the same time, the residual sample retained in step B is analyzed for chemical composition by a scanning electron microscope equipped with an energy dispersive spectrometer (SEM-EDS), so as to obtain the actual chemical composition information corresponding to the electrochemical test data. The corresponding chemical component information is obtained by testing with a scanning electron microscope equipped with an energy dispersive spectrometer. The partial test results of the system are as follows:

[0067] Table 1 test result schematic table

[0068]

[0069] The table shows the data results obtained by component characterization and electrochemical test. The sample is a Fe-based low alloy steel, and the C content is basically fixed at 0.12 wt.%, and the main variables are the contents of Cu and Ni, which present a certain gradient distribution in different filament electrodes. From the electrode potential, the overall interval is -0.398 V to -0.418 V (vs SCE), the difference is small, and the corrosion potential under different components is relatively close. From the galvanic current, the value fluctuates between 6.76E-06 and 1.63E-05 A·cm -2 , and there is obvious difference between different component combinations. Generally, the sample with lower current corresponds to better corrosion resistance. For example, the sample with Cu content of about 0.5 wt.% and Ni content in the interval of 0.2-0.3 wt.% shows lower galvanic current and relatively better corrosion resistance; when the Ni content increases to more than 0.7 wt.%, the Cu content decreases, the galvanic current increases significantly, and the corrosion resistance decreases. Through the table, the influence of different Cu-Ni ratios on the electrochemical performance can be directly reflected, and the component range with better corrosion resistance can be screened accordingly.

[0070] The present application provides a high-throughput detection method for the corrosion performance of alloy materials. A low alloy steel high-throughput sample with clear component difference is prepared by selective laser melting, an array electrode is formed by combining a multi-hole mold and a twice cold-embedding process, and then electrochemical test is carried out by point-by-point switching. Finally, the test data and the component characterization of the residual sample are correlated. The method combines high-throughput sample preparation, array electrode assembly and electrochemical test, and realizes systematic and high-throughput detection of corrosion performance.

[0071] The above-described embodiments are merely illustrative for the present application, wherein the modules described as separate components can or can not be physically separated, and the components shown as modules can or can not be physical modules, i.e., can be located in one place or distributed to multiple network modules. Part or all of the modules can be selected to achieve the purposes of the embodiments according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0072] Finally, it should be noted that: the embodiments disclosed by the present application are only the preferred embodiments of the present application, and are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for high-throughput detection of corrosion performance of an alloy material, characterized in that, The method comprises: A. Preparing a plurality of low-alloy steel high-throughput samples containing preset components and different contents by selective laser melting; wherein, at least two low-alloy steel powders with different chemical compositions are placed in independent hoppers, and discrete or continuous component gradient distribution of the wire electrode is realized by gradient powder feeding; B. Arranging the low-alloy steel high-throughput samples according to the arrangement rule according to the preset components to prepare the wire electrode and the residual sample; assembling the wire electrode in the multi-hole array mold according to the gradient order to form an array electrode, and performing cold setting twice; the mass ratio of epoxy resin to curing agent is 2:1 during the first cold setting, the epoxy resin is submerged in the wire electrode by 2-4 mm, the epoxy resin is higher than the working end of the electrode and lower than the positioning mold, and the second cold setting is used to cover and package the connection area of the wire electrode and the electrochemical test interface; C. Connecting each wire electrode and measuring each wire electrode in a point-by-point switching manner; D. Sequentially performing electrochemical tests on each wire electrode, characterizing the composition of the residual sample in step B, and establishing a corresponding relationship between the test data and the corresponding chemical composition; the electrochemical test adopts a three-electrode system, the array electrode is used as the working electrode, the reference electrode is a saturated calomel electrode, the counter electrode is a platinum plate, and the electrolyte is a 0.3 wt.% NaCl solution; the array electrode is immersed in the electrolyte for not less than 25 minutes before starting the electrochemical test.

2. The method according to claim 1, wherein the alloy material is a high-entropy alloy. When the wire electrode is cut from the substrate in step B, a residual sample is reserved for each wire electrode, and the residual sample is used for chemical composition detection and maintains a corresponding relationship with the wire electrode.

3. The method of claim 1, wherein the alloy material is a high-entropy alloy. In step C, the wire electrode is connected to the female-to-female color arrangement wire, the female-to-female color arrangement wire is connected to the DB50 multi-pin data line, and each group of 10 wires is connected.

4. The method of claim 2, wherein the alloy material is a high-entropy alloy. In step A, a rectangular base is arranged below the wire electrode, and the rectangular base is used to fix the wire electrode.

5. The method according to claim 4, wherein the alloy material is a high-entropy alloy. In step A, the wire electrode includes an upper end and a lower end; the upper end includes a first diameter conductive section, and the lower end includes a second diameter working section, and the first diameter is smaller than the second diameter.

6. The method of claim 4, wherein the alloy material is a high-entropy alloy. In step A, the upper end of the wire electrode is fixed in a fixed mold.

7. The method according to claim 2, wherein the alloy material is a high-entropy alloy. The height of the residual sample is 2-3 mm.

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