A multi-channel device for monitoring the corrosion resistance of a metal material

Abstract

The application discloses a kind of multi-channel metal material corrosion resistance monitoring devices, including probe, voltmeter or ammeter;The probe includes sealed body, reference electrode and working electrode, the reference electrode and working electrode are all arranged in sealed body, and one end of the reference electrode and working electrode is exposed from the side of sealed body, the other end is sealed in sealed body, the end of the reference electrode and working electrode sealed in sealed body is connected with voltmeter or ammeter by wire respectively;The reference electrode is set to one, and the reference electrode is located at the center position of sealed body;The working electrode is set to several, and the working electrode does not contact with reference electrode.The device can continuously monitor the corrosion potential or corrosion current of several working electrodes in corresponding corrosion environment, according to the corrosion potential or corrosion current data of monitored metal material, can select the metal material with good corrosion resistance for manufacturing refining equipment.

Description

Technical Field

[0001] This invention relates to the field of metal material corrosion performance monitoring technology, specifically to a multi-channel metal material corrosion resistance monitoring device. Background Technology

[0002] In the oil refining and chemical production industry, most oil refining and chemical production equipment suffers from varying degrees of failure due to factors such as raw material reactions and working environment. Corrosion failure accounts for more than 40% of the total equipment failures in oil refining and chemical production equipment. Therefore, it is necessary to monitor the corrosion behavior of equipment materials in oil refining and chemical production, that is, to monitor the corrosion behavior of the metal materials used in equipment in oil refining and chemical production, so as to select metal materials with good corrosion resistance to manufacture refining and chemical equipment.

[0003] Traditional methods for monitoring corrosion behavior in refining and chemical equipment rely on calculations based on the properties of process materials and corrosion models. However, due to limitations in the types of materials that can be measured and issues with measurement accuracy, the accuracy of both measurements and calculations is low. Existing corrosion testing methods for refining and chemical equipment tend to reflect the corrosivity of the equipment by directly measuring the corrosion behavior of metallic materials. The core of this testing method lies in the design of corrosion detection devices within the refining and chemical environment. For example, Chinese Patent 201510583966.7 discloses an image-based high-throughput characterization experimental device for metal corrosion. This experimental device includes a high-throughput electrolytic cell, metal electrodes, an electrochemical signal acquisition device, an image signal acquisition device, and a data processing device. The high-throughput electrolytic cell is installed on the test bench, with its bottom connected to the electrochemical signal acquisition device via wires and its upper part connected to the electrochemical signal acquisition device via a reference electrode. An image signal acquisition device is located above the high-throughput electrolytic cell, and both the image signal acquisition device and the electrochemical signal acquisition device are connected to the data processing device. This device is used for metal corrosion testing and can simultaneously react multiple samples, achieving real-time acquisition of electrochemical and image signals. It acquires images through a camera and uses image signal algorithms to study corrosion characteristics. Finally, it determines the overall corrosion degree of the image by combining the corrosion area ratio and the corrosion depth of local areas. Chinese Patent 201110358680.0 discloses a multi-channel galvanic corrosion measurement device, which can detect the galvanic corrosion potential and galvanic corrosion current of dissimilar metal materials. These two corrosion detection devices indirectly characterize the activity and corrosion rate of metals through corrosion morphology and galvanic corrosion rate, but cannot directly monitor the activity and corrosion rate of metals.

[0004] The electrochemical parameters related to the activity and corrosion rate of metals are corrosion potential and corrosion current. Therefore, this invention designs a new metal material corrosion performance monitoring device to directly monitor the corrosion potential or corrosion current of metal materials used in refining and chemical equipment. Based on the monitored corrosion potential or corrosion current data of the metal materials, metal materials with good corrosion resistance are selected to manufacture refining and chemical equipment, thereby improving the corrosion resistance of the refining and chemical equipment and extending its service life. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a multi-channel metal material corrosion resistance monitoring device. A reference electrode and several working electrodes are arranged within a sealed body to form a monitoring probe. This probe is placed in a corresponding corrosive environment, and the reference electrode and working electrodes are led out and connected to corresponding voltmeters or ammeters via wires. This allows for continuous monitoring of the corrosion potential or corrosion current of several working electrodes in the corresponding corrosive environment. Based on the monitored corrosion potential or corrosion current data of the metal material, metal materials with good corrosion resistance can be selected for use in manufacturing refining equipment.

[0006] To achieve the above objectives, the technical solution adopted by this invention is as follows:

[0007] A multi-channel metal material corrosion resistance monitoring device includes a probe and a voltmeter or ammeter, wherein the probe is connected to the voltmeter or ammeter via a wire;

[0008] The probe includes a sealed body, a reference electrode, and a working electrode. The reference electrode and the working electrode are both disposed inside the sealed body, with one end of the reference electrode and the working electrode protruding from one side of the sealed body and the other end sealed inside the sealed body. The end of the reference electrode and the working electrode sealed inside the sealed body are respectively connected to a voltmeter or a galvanometer via wires.

[0009] One reference electrode is provided, and the reference electrode is located at the center of the sealing body;

[0010] The working electrodes are arranged in a plurality of manner, and the working electrodes are evenly arranged around the reference electrode. The working electrodes do not contact the reference electrode, nor do they contact each other.

[0011] In the above technical solution, a monitoring probe is formed by setting a reference electrode and several working electrodes in the sealed body. The monitoring probe is placed in the corresponding corrosive environment, and the reference electrode and working electrodes are led out and connected to the corresponding voltmeter or ammeter through wires. The corrosion potential or corrosion current of several working electrodes in the corresponding corrosive environment can be continuously monitored. Based on the monitored corrosion potential or corrosion current data of the metal material, a metal material with good corrosion resistance can be selected for manufacturing refining equipment.

[0012] In addition, in the above technical solution, when the wires connected to the reference electrode and the working electrode are led out to the outside of the sealing body, the sealing performance of the sealing body needs to be guaranteed.

[0013] Furthermore, a plurality of slots are evenly arranged around the center position on one side of the sealing body. A conductive sheet is fixedly arranged at the center of the bottom of the slot. A sealing gasket is arranged inside the slot and on both sides of the conductive sheet. The working electrode is arranged in the slot, and one side of the working electrode is in contact with the conductive sheet. The conductive sheet is connected to a voltmeter or ammeter through a wire.

[0014] In the above technical solution, by pre-setting several slots on the sealing body, setting conductive sheets in the slots, and connecting the conductive sheets to the wires, the installation and replacement of the working electrode can be facilitated, thereby improving work efficiency.

[0015] Furthermore, each of the slots is provided with a bolt and nut assembly at both ends. Each bolt and nut assembly includes a fixing bolt and two oppositely arranged fixing nuts. The fixing nuts are fixed to the side of the sealing body, and the two fixing nuts of each bolt and nut assembly are respectively arranged on both sides of the slot. The fixing bolt is inserted into the fixing nuts to fix the working electrode in the slot.

[0016] In the above technical solution, when the working electrode is inserted into the slot, the working electrode can be fixed by the bolt and nut assembly to prevent the working electrode from coming out of the slot and to ensure that the working electrode and the electrode plate are always in contact during the monitoring process, thus ensuring the continuity and accuracy of the monitoring data.

[0017] Furthermore, the fixing bolts and fixing nuts are made of insulating material.

[0018] Furthermore, the reference electrode is made of one of the following: Au, Ag, Ag / AgCl, Pt, Cu, Ti, carbon steel, stainless steel, nickel-based alloy, or high-entropy alloy.

[0019] Furthermore, several of the working electrodes are made of different metallic materials.

[0020] Furthermore, the distance between the reference electrode and the working electrode is 0.01 to 200 mm.

[0021] In the above technical solution, by controlling the distance between the reference electrode and the working electrode, and separating the reference electrode and the working electrode by a sealed body, the two are prevented from being too close and making contact, thus ensuring the accuracy of the data during the monitoring process.

[0022] Furthermore, the distance between two adjacent working electrodes shall not be less than 2 mm.

[0023] In the above technical solution, it is necessary to control the distance between two adjacent working electrodes to prevent them from contacting each other, and to separate the working electrodes by a sealed body to avoid affecting the accuracy of the monitoring data.

[0024] Furthermore, the sealing body is made of insulating material, specifically polytetrafluoroethylene or acrylic material.

[0025] In the above technical solutions, polytetrafluoroethylene or acrylic materials not only have insulating properties, but also have good resistance to acid and alkali corrosion and oxidation resistance.

[0026] Furthermore, both the reference electrode and the sealing body are cylindrical.

[0027] The beneficial effects of this invention are as follows:

[0028] The present invention provides a multi-channel metal material corrosion resistance monitoring device, which forms a monitoring probe by setting a reference electrode and several working electrodes in a sealed body. The monitoring probe is placed in a corresponding corrosive environment, and the reference electrode and working electrodes are led out and connected to a corresponding voltmeter or ammeter through wires. The corrosion potential or corrosion current of several working electrodes in the corresponding corrosive environment can be continuously monitored. Based on the monitored corrosion potential or corrosion current data of the metal material, metal materials with good corrosion resistance can be selected for manufacturing refining and chemical equipment. The device has a simple structure and is convenient for testing. Attached Figure Description

[0029] To clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0031] Figure 2 This is a schematic diagram of the overall structure of Embodiment 2 of the present invention;

[0032] Figure 3 This is a time-potential curve diagram of Embodiment 3 of the present invention;

[0033] Figure 4 This is the time-potential curve diagram of Embodiment 4 of the present invention.

[0034] The diagram is labeled as follows: 1. Sealing body; 2. Reference electrode; 3. Working electrode; 4. Wire; 5. Slot; 6. Conductive sheet; 7. Fixing nut; 8. Fixing bolt. Detailed Implementation

[0035] This invention provides a multi-channel metal material corrosion resistance monitoring device. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention is further described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0036] In the description of this invention, it should be understood that the terms "top", "bottom", "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0037] In this invention, terms such as "connected" and "linked" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can determine the specific meaning of these terms in this invention based on the specific circumstances, and they should not be construed as limitations on the invention.

[0038] The present invention will now be described in detail with reference to the accompanying drawings:

[0039] Example 1

[0040] Reference Figure 1 This invention provides a multi-channel metal material corrosion resistance monitoring device, including a probe and a voltmeter or ammeter. The probe is connected to the voltmeter or ammeter via a wire 4. The probe includes a sealed body 1, a reference electrode 2, and a working electrode 3. The reference electrode 2 and the working electrode 3 are both disposed within the sealed body 1, with one end of each electrode protruding from one side of the sealed body 1 and the other end sealed within it. The sealed end of each electrode is connected to the voltmeter or ammeter via wires 4. This monitoring device forms a monitoring probe by placing a reference electrode 2 and several working electrodes 3 within the sealed body 1. The probe is placed in a corresponding corrosive environment, and the reference electrode 2 and the working electrodes 3 are led out and connected to the corresponding voltmeter or ammeter via wires 4, forming multiple monitoring channels. This allows for continuous monitoring of the corrosion potential and corrosion current of several working electrodes 3 in the corresponding corrosive environment. Based on the monitored corrosion potential and corrosion current data of the metal material, metal materials with good corrosion resistance can be selected for manufacturing refining equipment.

[0041] Specifically, the aforementioned sealing body 1 is cylindrical and is made of insulating material, which may be polytetrafluoroethylene or acrylic material.

[0042] One reference electrode 2 is provided, and the reference electrode 2 is made of one of Au, Ag, Ag / AgCl, Pt, Cu, Ti, carbon steel, stainless steel, nickel-based alloy, and high-entropy alloy; the reference electrode 2 is cylindrical and located at the center of the sealing body 1.

[0043] The aforementioned working electrodes 3 are provided in several units, and the several working electrodes 3 are made of different metal materials, that is, different metal materials used in refining and chemical equipment; the several working electrodes 3 are arranged on the edge of the sealing body 1 and are evenly distributed around the reference electrode 2. The working electrodes 3 and the reference electrode 2 do not contact each other, and two adjacent working electrodes 3 do not contact each other. The working electrodes 3 and the reference electrode 2, and two adjacent working electrodes 3 are separated by the sealing body 1 made of insulating material.

[0044] In addition, the distance between the reference electrode 2 and the working electrode 3 is 0.01 to 200 mm; the distance between two adjacent working electrodes 3 is not less than 2 mm. By controlling the distance between the reference electrode 2 and the working electrode and the distance between two adjacent working electrodes 3, and by separating the reference electrode 2 and the working electrode 3 through the sealing body 1, the accuracy of the monitoring data of the reference electrode 2 and the working electrode 3 during the monitoring process is ensured.

[0045] Example 2

[0046] Reference Figure 2 This invention also provides a pluggable multi-channel metal material corrosion resistance monitoring device, including a probe and a voltmeter or ammeter. The probe is connected to the voltmeter or ammeter via a wire 4. The probe includes a sealed body 1, a reference electrode 2, and a working electrode 3. The reference electrode 2 and the working electrode 3 are both disposed within the sealed body 1, with one end of the reference electrode 2 and the working electrode 3 protruding from one side of the sealed body 1 and the other end sealed within the sealed body 1. The sealed end of the reference electrode 2 and the working electrode 3 within the sealed body 1 is connected to the voltmeter or ammeter via the wire 4. This monitoring device forms a monitoring probe by setting one reference electrode 2 and several working electrodes 3 within the sealed body 1. The monitoring probe is placed in a corresponding corrosive environment, and the reference electrode 2 and the working electrodes 3 are led out and connected to the corresponding voltmeter and ammeter via the wire 4 to form multiple monitoring channels. This allows for continuous monitoring of the corrosion potential or corrosion current of several working electrodes 3 in the corresponding corrosive environment. Based on the monitored corrosion potential and corrosion current data of the metal material, metal materials with good corrosion resistance can be selected for manufacturing refining equipment.

[0047] Specifically, the sealing body 1 is cylindrical and made of insulating material, such as polytetrafluoroethylene (PTFE) or acrylic material. Several slots 5 are evenly distributed around the center of one side of the sealing body 1. A conductive sheet 6 is fixedly installed at the center of the bottom of each slot 5. Two conductive sheets 6 are provided, and they do not contact each other, with a gap of 1-2 mm between them. Sealing gaskets are provided inside the slots 5 and on both sides of the conductive sheets 6. The working electrode 3 is disposed within the slots 5, with one side of the working electrode 3 in contact with the conductive sheet 6. The two conductive sheets 6 are respectively connected to a voltmeter and an ammeter via wires 4. By pre-setting several slots 5 on the sealing body 1, placing conductive sheets 6 within the slots 5, and connecting the conductive sheets 6 to the wires 4, the installation and replacement of the working electrode 3 can be facilitated. In use, the working electrode 3 is simply inserted into the slot 5, improving working efficiency.

[0048] In addition, bolt and nut assemblies are provided at both ends of each slot 5. Each bolt and nut assembly includes a fixing bolt 8 and two oppositely arranged fixing nuts 7. The fixing nuts 7 are fixed to the side of the sealing body 1, and the two fixing nuts 7 of each bolt and nut assembly are respectively located on both sides of the slot 5. The fixing bolt 8 can be inserted into the fixing nuts 7. When the working electrode 3 is inserted into the slot 5, the working electrode 3 in the slot 5 can be fixed by inserting the fixing bolt 8 into the fixing nuts 7, preventing the working electrode 3 from coming out of the slot 5, and ensuring that the working electrode 3 and the electrode plate are always in contact during the monitoring process, thus ensuring the continuity and accuracy of the monitoring data.

[0049] The aforementioned fixing bolts 8 and fixing nuts 7 are made of insulating material to prevent them from interfering with the monitoring data.

[0050] One reference electrode 2 is provided, and the reference electrode 2 is made of one of Au, Ag, Ag / AgCl, Pt, Cu, Ti, carbon steel, stainless steel, nickel-based alloy, and high-entropy alloy; the reference electrode 2 is cylindrical and located at the center of the sealing body 1.

[0051] The aforementioned working electrodes 3 are provided in several units, and the several working electrodes 3 are made of different metal materials, that is, different metal materials used in refining and chemical equipment; the several working electrodes 3 are inserted into the slots 5 of the sealing body 1, the working electrodes 3 do not contact the reference electrode 2, and there is no contact between two adjacent working electrodes 3, the working electrodes 3 and the reference electrode 2, and the two adjacent working electrodes 3 are separated by the sealing body 1 made of insulating material.

[0052] Furthermore, the distance between the reference electrode 2 and the slot 5 is 0.01–200 mm; the distance between two adjacent slots 5 is not less than 2 mm. These limitations on the distance between the reference electrode and the slot 5, as well as the distance between two adjacent slots 5, are actually used to control the distance between the reference electrode 2 and the working electrolyzer, and the distance between two adjacent working electrodes 3, to ensure the accuracy of the monitoring data during the monitoring process.

[0053] Example 3

[0054] The corrosion performance of metal materials used in refining and chemical equipment was monitored using the multi-channel metal material corrosion resistance monitoring device in Example 1. The metal materials used in refining and chemical equipment were selected from 316, 316L, 316H, 316Ti, 316N, 316LN, and precipitation-hardened 316L.

[0055] The monitoring device includes a probe, which includes a sealed body 1, a reference electrode 2, and a working electrode 3. The reference electrode 2 and the working electrode 3 are both disposed inside the sealed body 1, with one end of the reference electrode 2 and the working electrode 3 protruding from one side of the sealed body 1 and the other end sealed inside the sealed body 1. The end of the reference electrode 2 and the working electrode 3 sealed inside the sealed body 1 is connected to a voltmeter or an ammeter via a wire 4.

[0056] The reference electrode 2 is a cylindrical copper block with a diameter of 30 mm and a height of 10 mm.

[0057] The working electrode 3 is made of the metal material used in the refining and chemical equipment to be tested, namely 316, 316L, 316H, 316Ti, 316N, 316LN, and precipitation-hardened 316L. The working electrode 3 is designed as a rectangular block with a length of 10mm, a width of 3mm, and a height of 10mm.

[0058] The distance between the reference electrode 2 and the working electrode 3 is 5 mm, and the distance between two adjacent working electrodes 3 is 3 mm.

[0059] The preparation process of the above-mentioned monitoring device is as follows: A cylindrical mold with a diameter of 50 mm and a height of 20 mm is selected. Molten polytetrafluoroethylene is poured into the mold to prepare the sealing body 1. Before the sealing body 1 is completely solidified, multiple wires 4 are first inserted from one side of the sealing body 1 and passed out from the other side. The two ends of the wires 4 are cleaned to prevent the insulating material from covering them and making them non-conductive. Then, one end of one of the wires is connected to the reference electrode, and the remaining wires are connected to the working electrode respectively. Then, the reference electrode 2 and the working electrode 3 are inserted into the not-fully solidified sealing body 1, so that the wires 4 are connected to the reference electrode 2 and the working electrode 3 respectively in the sealing body, and one side of the reference electrode 2 and the working electrode 3 is exposed from the sealing body 1. After the reference electrode 2, the working electrode 3 and the wires 4 are installed, the sealing body 1 is wrapped around them and continues to solidify, so that the reference electrode 2, the working electrode 3 and the wires 4 are tightly connected to the sealing body 1 and do not detach. After the sealing body 1 has completely solidified, the exposed sides of the sealing body 1 containing the reference electrode 2 and the working electrode 3 are polished smooth, thus producing a multi-channel metal material corrosion resistance monitoring device. Of course, this monitoring device can also be manufactured using a specific mold.

[0060] The aforementioned multi-channel metal material corrosion resistance monitoring device was placed in a pipeline of an oil refining unit. Multiple wires 4 were connected to the outside of the pipeline. The device was then connected to a multi-channel potentiometer for potential monitoring. Specifically, a wire 4 connected to the reference electrode 2 was connected to the positive terminal of each channel of the multi-channel potentiometer, and a wire 4 connected to each working electrode 3 was connected to the negative terminal of the corresponding channel of the multi-channel potentiometer. The potentiometer measured and recorded the data every minute. Alternatively, several potentiometers could be used instead of the multi-channel potentiometer for potential monitoring, or an ammeter could be used instead of a voltmeter. The ammeter could detect the corrosion current, and the corrosion resistance of the metal material could be determined by the corrosion current.

[0061] The time-potential curve measured by the potentiometer, such as Figure 3 As shown. From Figure 3 As can be seen, 316L and 316N stainless steels have the most positive potential and the smallest fluctuation, and they have the best corrosion resistance in this environment. Therefore, 316L or 316N stainless steels can be selected as materials for manufacturing refining and chemical equipment.

[0062] Example 4

[0063] The corrosion performance of metal materials used in refining and chemical equipment was monitored using the plug-in multi-channel metal material corrosion resistance monitoring device in Example 2. The metal materials used in refining and chemical equipment were selected from 316, 316L, 316H, 316Ti, 316N, 316LN, and precipitation-hardened 316L.

[0064] The monitoring device includes a probe, which includes a sealed body 1, a reference electrode 2, and a working electrode 3. The reference electrode 2 and the working electrode 3 are both disposed inside the sealed body 1, with one end of the reference electrode 2 and the working electrode 3 protruding from one side of the sealed body 1 and the other end sealed inside the sealed body 1. The end of the reference electrode 2 and the working electrode 3 sealed inside the sealed body 1 is connected to a voltmeter and a galvanometer respectively through a wire 4.

[0065] The aforementioned sealing body 1 is cylindrical and made of insulating material, specifically polytetrafluoroethylene (PTFE). Several slots 5 are evenly distributed around the center of one side of the sealing body 1. A conductive sheet 6 is fixedly disposed at the center of the bottom of each slot 5. Two conductive sheets 6 are disposed, and the two conductive sheets 6 do not contact each other, with a spacing of 2-5 mm between them. Sealing gaskets are disposed inside the slots 5 and on both sides of the conductive sheets 6 to prevent crevice corrosion within the slots. The working electrode 3 is disposed within the slots 5, with one side of the working electrode 3 contacting the conductive sheet 6. The two conductive sheets 6 are respectively connected to a voltmeter and an ammeter via wires 4.

[0066] In addition, bolt and nut assemblies are provided at both ends of each slot 5. Each bolt and nut assembly includes a fixing bolt 8 and two oppositely arranged fixing nuts 7. The fixing nuts 7 are fixed to the side of the sealing body 1, and the two fixing nuts 7 of each bolt and nut assembly are respectively located on both sides of the slot 5. The fixing bolt 8 can be inserted into the fixing nuts 7. The fixing bolt 8 and fixing nuts 7 are made of insulating material to prevent them from interfering with the monitoring data.

[0067] The preparation process of the above-mentioned plug-in monitoring device is as follows: A cylindrical mold with a diameter of 50 mm and a height of 20 mm is selected. Molten polytetrafluoroethylene is poured into the mold to prepare the sealing body 1. Before the sealing body 1 is completely solidified, multiple wires 4 are first inserted from one side of the sealing body 1 and exited from the other side. The ends of the wires 4 are cleaned to prevent insulating material from covering them and making them non-conductive. Then, one end of one of the wires 4 is connected to the reference electrode 2. The reference electrode 2 is inserted into the partially solidified sealing body 1, so that the wire and the reference electrode are connected inside the sealing body. Then, before the sealing body 1 solidifies, the fixing nut 7 is installed along the edge of the sealing body 1 according to the required working electrode 3. After the sealing body 1 is placed in the correct position, the fixing nut 7 can be tightly fixed to the sealing body 1 after it solidifies. After the sealing body 1 solidifies, six slots 5, each 10mm long, 3mm wide, and 5mm deep, are cut out on the sealing body 1. Two copper pieces, each 2mm long and 2mm wide, are placed in each slot 5 and connected to the other protruding wires 4. The two copper pieces are spaced 1mm apart. Then, sealing gaskets are placed on both sides of the two copper pieces and between the two copper pieces to fill the gaps between the slots and the copper pieces. After the sealing body 1 has completely solidified, the side of the sealing body 1 exposed by the reference electrode 2 and the working electrode 3 is polished smooth, thus completing the multi-channel metal material corrosion resistance monitoring device.

[0068] In this embodiment, the reference electrode 2 is a cylindrical copper block, specifically with a diameter of 30mm and a height of 10mm.

[0069] The working electrode 3 is made of the metal material used in the refining and chemical equipment to be tested, namely 316, 316L, 316H, 316Ti, 316N, 316LN, and precipitation-hardened 316L. The working electrode 3 is designed as a rectangular block with a length of 10mm, a width of 3mm, and a height of 10mm.

[0070] The distance between the reference electrode 2 and the working electrode 3 is 20 mm, and the distance between two adjacent working electrodes 3 is 3 mm.

[0071] When selecting refining equipment, a rectangular working electrode 3 made of metal material is made of the equipment to be tested. The working electrode 3 is inserted into the slot 5 of the plug-in multi-channel metal corrosion resistance monitoring device, ensuring contact between the working electrode 3 and the copper sheet in the slot 5. A fixing bolt 8 is inserted into a fixing nut 7 to secure the working electrode 3. Then, it is placed in a pipeline of the refining unit, with multiple wires 4 connected to the outside of the pipeline. The device is then connected to a multi-channel potentiometer for potential monitoring. Specifically, one wire 4 connected to the reference electrode 2 is connected to the positive terminal of each channel of the multi-channel potentiometer, and two wires 4 connected to each working electrode 3 are connected to the negative terminal of the corresponding channel of the multi-channel potentiometer. The potentiometer measures and records the data every minute.

[0072] The time-potential curve measured by the potentiometer, such as Figure 4 As shown. From Figure 4 As can be seen, 316L and 316N stainless steels have the most positive potential and the smallest fluctuation, and they have the best corrosion resistance in this environment. Therefore, 316L or 316N stainless steels can be selected as materials for manufacturing refining and chemical equipment.

[0073] It should be noted that any parts not mentioned in this invention can be achieved by using or referencing existing technologies.

[0074] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A multi-channel metal material corrosion resistance monitoring device, characterized in that, Includes a probe and a voltmeter or ammeter, wherein the probe is connected to the voltmeter or ammeter via a wire; The probe includes a sealed body, a reference electrode, and a working electrode. The reference electrode and the working electrode are both disposed inside the sealed body, with one end of the reference electrode and the working electrode protruding from one side of the sealed body and the other end sealed inside the sealed body. The end of the reference electrode and the working electrode sealed inside the sealed body are respectively connected to a voltmeter or a galvanometer via wires. One reference electrode is provided, and the reference electrode is located at the center of the sealing body; The working electrodes are provided in a plurality of manner, and the plurality of working electrodes are evenly arranged around the reference electrode, and the working electrodes and the reference electrode do not contact each other; A plurality of slots are evenly arranged around the center of one side of the sealing body. A conductive sheet is fixedly arranged at the center of the bottom of the slot. A sealing gasket is arranged inside the slot and on both sides of the conductive sheet. The working electrode is arranged in the slot, and one side of the working electrode is in contact with the conductive sheet. The conductive sheet is connected to a voltmeter or ammeter through a wire. Each of the slots is provided with a bolt and nut assembly at both ends. Each bolt and nut assembly includes a fixing bolt and two opposite fixing nuts. The fixing nuts are fixed to the side of the sealing body, and the two fixing nuts of each bolt and nut assembly are respectively located on both sides of the slot. The fixing bolt is inserted into the fixing nuts to fix the working electrode in the slot. The fixing bolts and fixing nuts are made of insulating material; The distance between the reference electrode and the working electrode is 0.01~200mm; The distance between two adjacent working electrodes shall not be less than 2 mm; The fabrication process of the multi-channel metal material corrosion resistance monitoring device is as follows: A cylindrical mold is selected, and molten insulating material is poured into the mold to prepare a sealing body. Before the sealing body is completely solidified, multiple wires are inserted from one side of the sealing body and exit from the other side. The ends of the wires are cleaned to prevent the insulating material from encasing them and rendering them non-conductive. Then, one end of one of the wires is connected to a reference electrode. The reference electrode is then inserted into the partially solidified sealing body, connecting the wire and the reference electrode within the sealing body. Finally, before the sealing body solidifies, a fixing nut is installed along the sealing body... The edges of the sealing body are arranged according to the required working electrode placement position, so that after the sealing body solidifies, the fixing nut can be tightly fixed to the sealing body. After the sealing body solidifies, slots are cut out on the sealing body, and conductive sheets are placed in each slot. The conductive sheets are then connected to the other protruding wires. Sealing gaskets are then placed on both sides of the two conductive sheets and between the two conductive sheets to fill the gaps between the slots and the conductive sheets. After the sealing body is completely cured and formed, the side of the sealing body where the reference electrode and the working electrode are exposed is polished smooth, thus producing a multi-channel metal material corrosion resistance monitoring device.

2. The multi-channel metal material corrosion resistance monitoring device according to claim 1, characterized in that, The reference electrode is made of one of the following: Au, Ag, Ag / AgCl, Pt, Cu, Ti, carbon steel, stainless steel, nickel-based alloy, or high-entropy alloy.

3. The multi-channel metal material corrosion resistance monitoring device according to claim 1, characterized in that, The various working electrodes are made of different metallic materials.

4. The multi-channel metal material corrosion resistance monitoring device according to claim 1, characterized in that, The sealing body is made of insulating material, specifically polytetrafluoroethylene or acrylic material.

5. The multi-channel metal material corrosion resistance monitoring device according to claim 1, characterized in that, Both the reference electrode and the sealing body are cylindrical.

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