High-throughput detection method for corrosion performance of alloy material

Abstract

The invention discloses a high-throughput detection method for the corrosion performance of an alloy material. The method comprises the following steps: A, preparing a plurality of low-alloy steel high-throughput samples containing preset components and having different contents through selective laser melting; b, regularly arranging the low-alloy steel high-flux samples according to preset components and an arrangement rule, and preparing a wire beam electrode and a residual sample; assembling the wire beam electrodes in a porous array mold according to a gradient sequence to form an array electrode, and performing cold inlaying twice; c, each tow electrode is connected, and each tow electrode is measured in a point-by-point switching mode; and D, sequentially carrying out electrochemical testing on each tow electrode, carrying out component characterization on the residual sample in the step B, and establishing a corresponding relationship between test data and corresponding chemical components. According to the invention, a selective laser melting high-throughput preparation means is combined with an array electrode scanning technology, so that rapid preparation and characterization of a high-throughput sample are realized.

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 the 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 a small amount of Cu, P, Cr, Ni and other elements to steel. However, this kind 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 composition gradient continuous or discrete distributed samples in a short time, which provides 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 composition gradient samples, but also can break through the size limit 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 play the overall efficiency advantage. Conventional electrochemical methods (such as polarization curve, electrochemical impedance spectroscopy) rely on one-by-one electrode test, which is long in cycle and limited in efficiency. Array electrode scanning method based on micro-element principle can obtain electrochemical information through a large number of wire electrode at the same time, which 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 electrode, but does not solve the problem of how to efficiently obtain a large number of gradient chemical composition samples, which limits 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 alloy 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: A. preparing a plurality of low alloy steel high-throughput samples containing preset components and different contents by selective laser melting; B. arranging the low-alloy steel high-flux samples according to the preset components and arranging rules to prepare a wire electrode and a residual sample; sequentially assembling the wire electrode in a gradient order in a multi-hole array mold to form an array electrode, and performing cold setting twice; C. connecting each wire electrode to measure each wire electrode in a point-by-point switching manner; 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 the test data and the corresponding chemical components.

[0008] In some embodiments, at least two low-alloy steel powders with different chemical components are respectively placed in separate hoppers in step A, and a gradient powder supply is used to achieve discrete or continuous component gradient distribution of the wire electrode.

[0009] In some embodiments, in step B, a residual sample is retained for each wire electrode when the wire electrode is removed from the substrate by wire cutting, and the residual sample is used for chemical component detection and maintains a corresponding relationship with the wire electrode.

[0010] In some embodiments, in the two cold settings in 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 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 electrode and the electrochemical test interface.

[0011] In some embodiments, in step C, the wire 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.

[0012] In some embodiments, in step A, a rectangular base is provided below the wire electrode, and the rectangular base is used to fix the wire electrode.

[0013] In some embodiments, in step D, the electrochemical test uses 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 sheet, 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.

[0014] In some embodiments, in step A, the wire electrode 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.

[0015] In some embodiments, in step A, the upper part of the wire electrode is fixed in a fixed mold.

[0016] In some embodiments, the height of the residual sample is 2-3 mm.

[0017] Compared with the prior art, the present application has the beneficial effects that: The present application provides a high-throughput detection method for corrosion performance of alloy materials, which combines a high-throughput sample preparation method of selective laser melting with an array electrode scanning technology to realize rapid preparation and characterization of high-throughput samples. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A flowchart of the high-throughput detection method for corrosion performance of alloy materials provided by the present application; Figure 2 A first schematic diagram of a wire electrode in the high-throughput detection method for corrosion performance of alloy materials provided by the present application; Figure 3 A second schematic diagram of a wire electrode in the high-throughput detection method for corrosion performance of alloy materials provided by the present application; In the figure: 1, fixed mold; 2, wire electrode; 3, wire cutting direction; 4, rectangular base. DETAILED DESCRIPTION

[0019] 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 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.

[0020] The terms "comprising" and "having" and any variations thereof in the embodiments of the present application are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or modules does not have to be limited to those steps or modules clearly listed, but can include other steps or modules that are not clearly listed or inherent to these processes, methods, products or devices.

[0021] The embodiments of the present application disclose a high-throughput detection method for corrosion performance of alloy materials, which combines a high-throughput preparation method of selective laser melting with an array electrode scanning technology to realize rapid preparation and characterization of high-throughput samples.

[0022] As Figure 1The method comprises the following steps: A. Preparing a plurality of low-alloy steel high-throughput samples containing preset components and different contents by selective laser melting.

[0023] 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 the selective laser melting process at one time. The samples are substantially consistent in shape and size, but differ in chemical composition. To obtain different chemical composition ratios, at least two low-alloy steel powders are placed in separate hoppers, and the chemical composition is continuously or discretely changed during the forming process through a gradient powder feeding mode, so that the wire electrode samples containing preset elements and different contents are obtained in the same batch preparation.

[0024] The wire electrode sample not only serves as a working electrode for subsequent electrochemical tests, but also has an integral cuboid base portion below it that can be used for composition characterization, thereby ensuring that each wire electrode 2 corresponds to the corresponding chemical composition data. The rectangular base is used to fix the remaining wire electrodes 2, prepare samples for testing chemical composition, and reduce the difficulty of sample preparation.

[0025] After a series of start-up preparation work such as leveling by the scraper of the powder laying device and argon gas protection, the laser light source of the device is turned on, and the forming process 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 follows: scanning speed v = 100-600 mm / s, scanner power P = 50-400 W, scanning pitch and layer thickness are set to 0.07-0.1 mm and 0.02-0.04 mm, respectively. The specific process parameters can be determined by experimental testing according to the actual material, and are not limited in the present application.

[0026] In some embodiments, the substrate is placed in the cleaning work chamber, the scraper of the powder laying device is leveled, the work chamber door is closed, argon gas protection is provided, and the gas circulation system is turned on to reduce the oxygen content in the chamber to below 1000 ppm. The powder laying 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 gas protection is provided and the oxygen content in the chamber is reduced, the gas circulation mode provides a large air speed to accelerate air flow and rapidly reduce the oxygen content. When the processing officially starts, an excessive air speed will damage the powder bed that has been laid on the surface of the substrate, 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, thereby improving the forming quality.

[0027] Each powder laying can obtain a powder bed with corresponding content distribution, and the number of powder laying can be set to 1-3 times, preferably 2 times in the present application, so as to form a material structure with gradually changing composition during forming. For different alloy systems, even if the number of powder laying is increased, the final obtained composition gradient mainly depends on the added powder composition and its ratio. Start scanning the 2 times forming model base, so that the formed model can be tightly connected with the substrate. After the related preparation is completed, the processing forming is started, and the high-throughput sample with discrete composition gradient is obtained, and the composition and content preset increase or decrease are realized according to the gradient direction.

[0028] B. According to the preset composition, the low-alloy steel high-throughput sample is arranged according to the arrangement rule to prepare a wire electrode; the wire electrode is assembled in the porous array mold according to the gradient order to form an array electrode, and is subjected to twice cold-embedding; The low-alloy steel high-throughput sample obtained by selective laser melting cannot be distinguished by the naked eye in terms of specific content or component difference. In order to distinguish, the low-alloy steel high-throughput sample is fixed on the base, and then subjected to wire cutting processing, so that all the low-alloy steel high-throughput samples are taken off and arranged on the base according to the arrangement rule in step A.

[0029] 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 the present application, the first diameter is 0.7 mm, and the second diameter is 1 mm. Φ1 Φ2 Since the number of wire electrodes 2 is large and the volume is small, after being processed by additive manufacturing, they are fixed on the metal substrate and cannot be directly taken off manually, and generally need to be sampled by wire cutting processing. However, since each wire electrode is almost identical in appearance, if direct cutting sampling is performed, the sample order will be chaotic and the corresponding relationship cannot be distinguished. Therefore, when wire cutting processing is performed, a fixed mold 1 is arranged above the wire electrode, which is used to maintain the relative position and order of the wire electrode during cutting, so that the sample can still be arranged according to the original gradient order after sampling, and the sample preparation efficiency is improved.

[0030] In order to ensure that the order of each wire electrode is not disturbed during sampling, a fixed mold 1 needs to be arranged above the wire electrode, which is used to maintain the relative position and order of the wire electrode during cutting, so that the sample can still be arranged according to the original gradient order after sampling, and the sample preparation efficiency is improved. Figure 2 ​The fixed mold 1 is shown to be positioned. A rectangular base 4 is integrally formed below the wire bundle electrode 2, which can retain a certain height of residual sample after line cutting. This residual sample can be used for chemical composition detection, thereby ensuring that each wire bundle electrode can correspond to the actual chemical composition information. Due to the possibility of element burning or uneven mixing of powder in the additive manufacturing process, the actual obtained composition gradient may differ from the preset value, and therefore the actual composition of the electrode needs to be confirmed by the composition characterization 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.

[0031] Subsequently, a wire cutting machine is used to cut from below the wire bundle electrode along the wire cutting direction 3 as shown, Figure 2 The wire bundle electrode is cut off in sequence. A residual sample with a height of 2-3 mm is retained during the cutting process as a sample for subsequent chemical composition testing. In this way, the wire bundle electrode taken off maintains a one-to-one correspondence with the residual sample below, ensuring that each wire bundle electrode can correspond to accurate chemical composition data. The wire bundle electrode taken off is polished on the surface and arranged in the original order.

[0032] The wire bundle electrode taken off is polished to remove oxidation or rust, and is arranged in sequence according to the composition gradient of the preset composition system, and is then inserted into the small holes of the multi-hole array mold, which is distributed as 10x10 as shown. Figure 3

[0033] In some embodiments, after assembly is completed, the epoxy resin and the curing agent are mixed in a mass ratio of 2:1, poured into a cold insert mold with a diameter of 50 mm for the first cold insert, and the array mold with the wire bundle electrode inserted is buckled, so that the mixed epoxy resin can submerge the wire bundle electrode by about 3 mm. In this process, the electrode maintains the established order and maintains a certain 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 wire bundle electrode is then connected with the socket type flexible flat cable in sequence.

[0034] After the above connection is completed, the mixed epoxy resin is poured into the cold insert mold again for the second cold insert, and at this time the epoxy resin needs to submerge the close contact area between the wire bundle electrode and the interface to achieve reliable sealing. After the second insert 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.

[0035] ​C. Connecting each of the wire bundle electrodes in the array electrode to measure each of the wire bundle electrodes in a point-by-point switching manner.

[0036] After the preparation of the array electrode is completed, the array electrode is connected with a data acquisition device. A flexible flat cable with a socket-type interface at one end is connected with a side joint of a 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 joint of the flexible flat cable in turn, and is grouped in a manner of every 10 wires as a group. To further ensure stable connection, electrician's tape can be used to reinforce the outside of the interface. Since the test process of the array electrode is point-by-point switching measurement rather than simultaneous data acquisition of multiple electrodes, there is no obvious mutual influence between the electrodes; in the case of stable double-layer, the difference in a short period of time during data acquisition can be ignored.

[0037] After the above connection is completed and cured by epoxy resin, the other side joint 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, so as to realize the electrical connection of the array electrode and the test device.

[0038] D. Each wire bundle electrode is sequentially subjected to electrochemical testing, the residual sample in step B is subjected to composition characterization, and the test data are correlated with the corresponding chemical composition.

[0039] According to the conventional electrochemical test method, a NaCl solution with a mass fraction of 0.3 wt.% 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 a 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 a 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 bundle electrode with different chemical composition and the reference electrode is obtained in sequence.

[0040] 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 bundle electrode with different chemical composition and the counter electrode is measured in sequence. In actual application, the collected data can be plotted into a chart, and a more reasonable chemical composition interval can be selected according to the difference in the galvanic current value. At the same time, the residual sample remaining in step B is analyzed for chemical composition by an energy dispersive spectrometer equipped with a scanning electron microscope, so as to obtain the actual composition information corresponding to each wire bundle electrode, and realize the establishment of the corresponding relationship between the electrochemical performance and the chemical composition.

[0041] The following examples are provided to illustrate the method using Fe-Cu (Cu content: 0.68 wt.%) and Fe-Ni (Ni content: 1.07 wt.%).

[0042] A. Cu and Ni content gradient distribution low alloy steel high-throughput samples were obtained by means of Longsheng AFS-M120X gradient powder supply selective laser melting 3D printer.

[0043] Fe-Cu and Fe-Ni low alloy steel powders were added to the respective hoppers, and the C content of both powders was about 0.12 wt.%. The composition gradient that can be obtained by adding powders with different chemical compositions. Generally, the mixture of the two powders is in a ratio of about 1:1, and the distribution accuracy of the continuous gradient composition needs to be characterized and judged according to the obtained sample.

[0044] The wire electrode model as shown in Figure 2 was imported, and the upper end of the wire electrode, i.e., the conductive section Φ1 = 0.7 mm, and the electrode diameter of the lower end, i.e., the working section Φ2 = 1 mm. To ensure smooth sampling and subsequent chemical composition of all samples, a cuboid base model was added below the fixed wire electrode, with dimensions of 116 mm x 2 mm x 2 mm.

[0045] The selective laser melting process parameters were set as follows: scanning speed 400 mm / s, laser power 140 W, scanning pitch 0.09 mm, and layer thickness 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 smoothly formed and reach the required density.

[0046] Before processing, the substrate in the working chamber was cleaned, and the doctor blade of the powder laying device was leveled. Then the working chamber door was closed and argon was filled, and the gas circulation system was started to reduce the oxygen content in the chamber to below 1000 ppm. After the oxygen content was reduced to the specified level, the gas circulation mode was adjusted to avoid damaging the powder bed due to excessive gas flow during the forming process, while ensuring that surface impurities can be removed during printing to improve the forming quality. In this embodiment, manual control of the equipment was used for two powder laying operations, and each powder laying operation could obtain a gradient distribution powder bed composed of Fe-Cu powder and Fe-Ni powder. The number of powder laying operations is not limited to 2, and it can also be 1 or 3. After the powder laying was completed, the current page was scanned twice to form a model base, so that the subsequent formed sample was tightly combined with the substrate. After completing the above preparation work, laser processing was started, and finally a high-throughput sample of the Fe-Cu-Ni system was obtained, with a composition gradient of gradually decreasing Cu content and gradually increasing Ni content.

[0047] B, arranging the high-throughput samples of Fe-Cu-Ni system according to the arrangement rule according to the preset composition, preparing a wire electrode; arranging the wire electrode in a gradient order in a multi-hole array mold to form an array electrode, and performing cold setting twice.

[0048] The small-size wire electrodes with different chemical compositions obtained by the selective laser melting method are almost completely consistent in shape. In order to avoid the sequence 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. When cutting, 2-3 mm of residual sample is retained. The removed wire electrode is polished to remove the oxide skin or rust, and then arranged in the gradient order of the composition of the Fe-Cu-Ni system, and inserted into the small holes of the array electrode mold. The small holes are arranged in a 10x10 matrix, and the assembly effect is shown in Figure 3

[0049] 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 removed 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.

[0050] After the above connection is completed, the mixed epoxy resin is poured into the cold setting mold again for the second time. At this time, the resin should cover and seal the contact area of the wire electrode and the interface to ensure reliable connection. After complete curing, the working surface of the array electrode is polished to 800# accuracy, which can be used for electrochemical test. If used for chemical composition characterization, further polishing to 2000# and polishing are required. Through the above steps, the array electrode high-throughput sample suitable for Fe-Cu-Ni system low alloy steel is obtained.

[0051] C, connecting each of the wire electrodes, and measuring each of the wire electrodes in a point-by-point switching manner; ​After the array electrode is prepared, it needs to be connected with the data acquisition device. Specifically, the flexible flat cable with a plug interface at one end is 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. Then, the socket interface at the other end of the array electrode is connected to the connector of the flexible flat cable in sequence, and is arranged in groups of every 10 wires. To ensure stable contact, electrical tape can be wrapped around the connection for reinforcement. Since the test process of the array electrode is in point-by-point switching mode, the electrodes are measured individually in sequence, so there is no interference between the electrodes. The data difference in a short time under stable double-layer conditions can be ignored.

[0052] 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.

[0053] D. Electrochemical tests are performed on each filament electrode in sequence, the residual sample described in step B is subjected to composition characterization, and the test data are correlated with the corresponding chemical composition.

[0054] 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 the saturated calomel electrode, which is a commonly used reference electrode at room temperature, and the counter electrode cable is connected to the platinum electrode, thereby forming a complete three-electrode test system.

[0055] After the electrolytic cell is built, 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 sequence. 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 sequence. In practical applications, the collected data can be plotted into a chart, and reasonable alloy composition intervals can be selected according to the difference in galvanic current values. 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), thereby obtaining actual chemical composition information corresponding to the electrochemical test data. The corresponding chemical composition information is obtained by testing with a scanning electron microscope equipped with an energy dispersive spectrometer. Part of the test results of the system are as follows: Table 1 Test result schematic table

[0056] The table shows the data results obtained by component characterization and electrochemical test. The sample is a Fe-based low alloy steel, the C content is basically fixed at 0.12 wt.%, and the main variable is the content of Cu and Ni, which presents a certain gradient distribution in different wire electrodes. From the electrode potential, the overall interval is -0.398 V to -0.418 V (vs SCE), the difference is small, which shows that 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 In general, 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 of 0.2-0.3 wt.% shows lower galvanic current, and the corrosion resistance is relatively good; 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 selected accordingly.

[0057] The present application provides a high-throughput detection method for the corrosion performance of an alloy material. 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 porous mold and a twice cold-embedding process, and then electrochemical test is performed 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.

[0058] The above-described embodiments are only illustrative, and 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., they can be located in one place or distributed on multiple network modules. Some or all of the modules can be selected to achieve the purpose of the embodiments according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0059] 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 high-throughput detection method for corrosion performance of alloy materials, characterized in that: The method comprises: A. Prepare multiple high-throughput samples of low-alloy steel containing preset components and varying contents by selective laser melting; B. Arranging the low-alloy steel high-throughput sample regularly according to a preset composition and arrangement rule to prepare a wire bundle electrode and a residual sample; assembling the wire bundle electrode in a multi-hole array mold in a gradient order to form an array electrode, and performing two cold mounting processes; C. connecting each of the wire bundle electrodes and measuring each of the wire bundle electrodes in a point-by-point switching manner; D. Perform electrochemical testing on each wire bundle electrode in turn, characterize the composition of the residual sample described in step B, and establish a corresponding relationship between the test data and the corresponding chemical composition.

2. The high-throughput detection method for corrosion performance of alloy materials according to claim 1, characterized in that: In step A, at least two low-alloy steel powders with different chemical compositions are placed in independent silos, and a discrete or continuous composition gradient distribution of the wire beam electrode is achieved through gradient powder supply.

3. The high-throughput detection method for corrosion performance of alloy materials according to claim 2, characterized in that: When the wire bundle electrodes are removed from the substrate by wire cutting in step B, a residual sample is retained on each wire bundle electrode. The residual sample is used for chemical composition detection and maintains a corresponding relationship with the wire bundle electrode.

4. The high-throughput detection method for corrosion performance of alloy materials according to claim 3, characterized in that: In the two cold mountings of step B, the mass ratio of epoxy resin to curing agent is 2:1 during the first cold mounting, and the epoxy resin submerges 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 mounting is used to cover and encapsulate the connection area between the wire bundle electrode and the electrochemical test interface.

5. The high-throughput detection method for corrosion performance of alloy materials according to claim 2, characterized in that: In step C, the tow electrode is connected to the female-to-female rehearsal wire, and the female-to-female rehearsal wire is connected to the DB50 multi-pin data cable, and the connection is grouped into groups of 10 wires.

6. The high-throughput detection method for corrosion performance of alloy materials according to claim 3, characterized in that: In step A, a rectangular base is provided below the wire beam electrode, and the rectangular base is used to fix the wire beam electrode.

7. The high-throughput detection method for corrosion performance of alloy materials according to claim 6, characterized in that: The electrochemical test in step D adopts a three-electrode system, with 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 electrochemical test is started after the array electrode is immersed in the electrolyte for at least 25 minutes.

8. The high-throughput detection method for corrosion performance of alloy materials according to claim 7, characterized in that: In step A, the wire bundle electrode includes an upper end and a lower end; the upper end includes a conductive segment of a first diameter, and the lower end includes a working segment of a second diameter, and the first diameter is smaller than the second diameter.

9. The high-throughput detection method for corrosion performance of alloy materials according to claim 7, characterized in that: In step A, the upper portion of the wire bundle electrode is fixed in a fixed mold.

10. The high-throughput detection method for corrosion performance of alloy materials according to claim 3, characterized in that: The height of the residual sample is 2 to 3 mm.

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