An electrochemical measurement device for material corrosion in a circulating water system and its usage method

Abstract

The present invention discloses an electrochemical measurement device and a usage method for material corrosion in a circulating water system. The device includes an electrochemical test container and a rotating disk electrode; the electrochemical test container is provided with a working electrode test hole; a reference electrode and an auxiliary platinum electrode are arranged at positions opposite to the working electrode test hole; the rotating disk electrode is integrally disk-shaped, and the rotating disk electrode is provided with a plurality of disk working electrodes made of different materials. The bottom of each electrode is welded to a copper wire, and multiple wires are aggregated into a test wire; there is a rotating shaft at the center of the rotating disk electrode; the rotating disk electrode is arranged at the working electrode test hole, and by rotating the rotating shaft, the rotation of the rotating disk electrode can be controlled to adjust different disk working electrodes to be in the working electrode test hole. This device reduces the interference of circulating water flow on electrochemical testing while ensuring the flow of circulating water.

Description

Technical Field

[0001] The invention belongs to a corrosion monitoring device for circulating water equipment in a thermal power plant, and in particular relates to an electrochemical measuring device for corrosion of materials in a circulating water system and a use method thereof. Background Art

[0002] The circulating water system is one of the important systems in thermal power plants. With the increasing demand for water conservation, the operating water quality of circulating water has become more complex, and the corrosion risk of materials in the system has gradually increased. Timely monitoring of the corrosion rate of materials during system operation, and then guiding the addition of corrosion inhibitors and water quality control are of great significance for the safe operation of the circulating water system.

[0003] However, there are many types of materials involved in the circulating water system, generally including carbon steel, stainless steel and copper, and the corrosion types of these materials are also different. The corrosion type of carbon steel is mainly uniform corrosion, and the main corrosion type of stainless steel is pitting corrosion. Conventional corrosion coupon tests can only reflect the corrosion results of materials within a certain period of time, which takes a long time and cannot reflect the corrosiveness of circulating water in a timely manner.

[0004] Corrosion electrochemical testing can quickly reflect the corrosion behavior of materials in a short period of time. Different types of corrosion use different electrochemical testing methods. Carbon steel corrosion generally focuses on its uniform corrosion rate, generally using linear polarization resistance measurement or using polarization curve Tafel zone fitting to calculate the self-corrosion current density. Stainless steel corrosion generally focuses on its pitting corrosion, and generally uses polarization curves to test its pitting breakdown potential.

[0005] Polarization curve measurement in electrochemical testing is a commonly used test method to calculate the corrosion rate of materials using Tafel zone fitting. However, the polarization curve test process is equivalent to accelerating the corrosion of carbon steel electrodes. After a single measurement, the surface state of the carbon steel electrode has changed and cannot be reused. The pitting behavior of stainless steel can also be judged by polarization curve testing, but after polarization is broken, the surface state of the stainless steel electrode has also changed. Therefore, how to reuse the electrode has become a major problem that plagues the evaluation of electrochemical corrosion in the strong polarization interval. In addition, sludge and suspended matter in the circulating water will also interfere with the corrosion electrochemical measurement process, making the probe tests of the resistance method and the inductance method inaccurate. In addition, during the electrochemical test, the flow of water also has a strong interference effect on the electrochemical measurement. It is precisely because of these factors that there is currently no relatively mature electrochemical corrosion measurement device for various materials in the circulating water system on the market. Summary of the invention

[0006] To solve the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide an electrochemical measurement device and a usage method for material corrosion in a circulating water system. The present invention reduces the interference of circulating water flow on electrochemical testing while ensuring the flow of circulating water.

[0007] The present invention adopts the following technical solutions:

[0008] An electrochemical measurement device for material corrosion in a circulating water system, comprising an electrochemical test container and a rotating disk electrode;

[0009] One side of the electrochemical test container is provided with a circulating water inlet, and the other side of the electrochemical test container is provided with a circulating water outlet. A working electrode test hole is arranged near the bottom position of the electrochemical test container on the side of the circulating water outlet; a reference electrode and an auxiliary platinum electrode are arranged at a position directly opposite to the working electrode test hole.

[0010] The rotating disk electrode is integrally disk-shaped, and the rotating disk electrode is provided with a plurality of disk working electrodes made of different materials. The bottom of each electrode is welded to a copper wire, and multiple wires are aggregated into a test wire; there is a rotating shaft at the center of the rotating disk electrode; the rotating disk electrode is arranged at the working electrode test hole, and the rotation of the rotating disk electrode can be controlled by rotating the rotating shaft to adjust different disk working electrodes to be in the working electrode test hole.

[0011] As a further improvement of the present invention, the rotating disk electrode is symmetrically arranged with four disk working electrodes along the center, namely a first disk working electrode, a second disk working electrode, a third disk working electrode, and a fourth disk working electrode.

[0012] As a further improvement of the present invention, a working electrode test cover plate for opening and closing the working electrode test hole is arranged inside the working electrode test hole.

[0013] As a further improvement of the present invention, it further comprises an electrode cleaning assembly; the electrode cleaning assembly includes a demineralized water flushing pipe, a working electrode grinding assembly, and a hot air blower;

[0014] The working electrode grinding assembly is arranged at the bottom of the electrochemical test container, and the grinding head of the working electrode grinding assembly is arranged opposite to the disk working electrode on the rotating disk electrode that is not placed in the working electrode test hole;

[0015] The demineralized water flushing pipe and the hot air blower are respectively arranged on both sides of the working interface between the grinding head and the rotating disk electrode.

[0016] As a further improvement of the present invention, the working electrode grinding assembly is connected with a driving device for driving the working electrode grinding assembly to rotate.

[0017] As a further improvement of the present invention, the diameter of the grinding head of the working electrode grinding assembly is the same as that of the disc working electrode.

[0018] As a further improvement of the present invention, the auxiliary platinum electrode is connected with an auxiliary electrode test wire, and the reference electrode is connected with a reference electrode test wire for transmission, and the test wire is connected with a working electrode test wire.

[0019] A method for using an electrochemical measurement device for material corrosion in a circulating water system includes the following steps:

[0020] The circulating water flows into the electrochemical test container from the water inlet and then flows out from the water outlet.

[0021] Rotate the rotating disk electrode so that the working electrode for testing is in the position directly opposite to the working electrode test hole; the three-electrode method is used for electrochemical testing during the test.

[0022] After the test is completed, rotate the rotating disk electrode to rotate the working electrode to be tested to the position directly opposite to the working electrode test hole.

[0023] It also includes a step of cleaning the surface of the tested working electrode, specifically including:

[0024] Use a desalted water flushing pipe to conduct a preliminary flushing of the surface attachments.

[0025] Rotate the working electrode grinding assembly, and use the grinding head to grind the surface of the working electrode to remove the surface attachments.

[0026] Use the desalted water flushing pipe to flush the surface of the working electrode again.

[0027] After flushing several times with desalted water, turn on the hot air blower to dry the surface of the working electrode.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] The corrosion electrochemical measurement electrode of the present invention is installed in the circulating water bypass, and a test container several times larger in diameter than the inlet pipe is designed. On the premise of ensuring the flow of circulating water, the interference of circulating water flow on electrochemical testing is reduced. The working electrodes of the present invention are symmetrically arranged on the disc-shaped electrode, and multiple test electrodes can be switched by rotating the disc-shaped electrode, and multiple materials can be set on the disc-shaped electrode.

[0030] Furthermore, the device of the present invention is designed with a disc working electrode cleaning device, which can clean, grind and dry the surface of the disc working electrode, so that the electrode can be reused after undergoing strong polarization testing. Description of the Drawings

[0031] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention disclosure in any way. Additionally, the shapes and proportional dimensions of the various components in the drawings are merely schematic and are used to assist in understanding the present invention, rather than specifically defining the shapes and proportional dimensions of the various components of the present invention. In the drawings:

[0032] Figure 1 It is a schematic diagram of an electrochemical measurement device for material corrosion in the circulating water system of the present invention.

[0033] Figure 2 It is a top view schematic diagram of a rotating disk electrode in the present invention. Detailed implementation manners

[0034] In order to enable those skilled in the art of the present technology to better understand the technical solutions in the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0035] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present invention. The terms used in the description of the present invention in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0037] As Figure 1 shown, an electrochemical measurement device for material corrosion in a circulating water system, the corrosion monitoring device includes an electrochemical test container, a rotating disk electrode and an electrode cleaning assembly, which are three parts. A circulating water inlet 3 is provided at a position near the bottom on one side of the electrochemical test container 1, a circulating water outlet 2 is provided at a position near the top on the other side of the electrochemical test container 1, and a working electrode test hole 19 and a working electrode test cover plate 16 are provided at a position near the bottom of the electrochemical test container 1 on one side of the circulating water outlet 2. A reference electrode 6 and an auxiliary platinum electrode 5 are arranged at a position directly opposite to the working electrode test hole 19.

[0038] The rotating disk electrode 4 is integrally disk-shaped. The rotating disk electrode 4 is provided with a plurality of disk working electrodes made of different materials. The bottom of each electrode is welded to a copper wire, and multiple wires are aggregated into a test wire 9. There is a rotating shaft 20 at the center of the rotating disk electrode 4. The rotating disk electrode 4 is arranged at the working electrode test hole 19, and the rotation of the rotating disk electrode 4 can be controlled by rotating the rotating shaft 20 to adjust different disk working electrodes to be within the working electrode test hole 19.

[0039] As a preferred embodiment, as Figure 2 shown, the rotating disk electrode 4 is integrally disk-shaped, and 4 disk working electrodes are symmetrically arranged along the center, namely the first disk working electrode 7, the second disk working electrode 8, the third disk working electrode 17, and the fourth disk working electrode 18. The bottom of each electrode is welded to a copper wire, and 4 wires are aggregated into a test wire 9. There is a rotating shaft 20 at the center of the rotating disk electrode 4, which can control the rotation of the rotating disk electrode for the switching of the 4 electrodes.

[0040] Of course, using other numbers of disk working electrodes can also meet the test requirements.

[0041] A working electrode test cover plate 16 for opening and closing the working electrode test hole is arranged inside the working electrode test hole 19.

[0042] As Figure 1 shown, the electrode cleaning assembly includes a demineralized water flushing pipe 12, a working electrode grinding assembly 10, and a hot air blower 11. The grinding head 21 of the working electrode grinding assembly 10 has the same diameter as the disk working electrode.

[0043] Among them, the working electrode grinding assembly 10 is arranged at the bottom of the electrochemistry test container 1, and the grinding head 21 of the working electrode grinding assembly 10 is arranged opposite to the disk working electrode on the rotating disk electrode 4 that is not placed within the working electrode test hole 19.

[0044] The demineralized water flushing pipe 12 and the hot air blower 11 are respectively arranged on both sides of the working interface between the grinding head 21 and the rotating disk electrode 4.

[0045] The working electrode grinding assembly 10 is connected to a driving device that drives the working electrode grinding assembly 10 to rotate. For example, a motor. The grinding head 21 of the working electrode grinding assembly 10 has the same diameter as the disk working electrode.

[0046] The auxiliary platinum electrode 5 is connected to an auxiliary electrode test wire 13, the reference electrode 6 is connected to a reference electrode test wire 14 for transmission, and the test wire 9 is connected to a working electrode test wire 15.

[0047] The present invention also provides a method for using an electrochemical measurement device for material corrosion in a circulating water system, comprising the following steps:

[0048] After the circulating water flows into the electrochemical test container 1 from the water inlet 3 and fills the electrochemical test container 1 , it flows out from the water outlet 2 .

[0049] The rotating disk electrode is rotated so that the working electrode for testing is located opposite to the working electrode test hole 19, and the working electrode cover 16 is opened. During the test, the three-electrode method is used for electrochemical testing, in which the auxiliary platinum electrode 5 is an auxiliary electrode, the auxiliary electrode signal is transmitted through the auxiliary electrode test line 13, the reference electrode 6 signal is transmitted through the reference electrode test line 14, and the working electrode test model is transmitted through the working electrode test line 15.

[0050] After the test is completed, the working electrode cover plate 16 is closed, and the rotating disk electrode is rotated to rotate the working electrode to be tested to a position directly facing the working electrode test hole 19 .

[0051] The cleaning steps for the tested working electrode surface are as follows:

[0052] First, the surface attachments are preliminarily rinsed using the deionized water flushing tube 12, and then the surface of the working electrode is grinded by the grinding head 21 through the rotation of the working electrode grinding assembly 10 to remove the attachments on the surface of the working electrode. Then, the surface of the working electrode is rinsed again using the deionized water flushing tube 12. After rinsing with deionized water several times, the hot air blower 11 is turned on to dry the surface of the working electrode. At this point, the working electrode has been processed and can be used for the next electrochemical test.

[0053] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and to distinguish similar objects. There is no order of precedence between the two, and they cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0054] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather with reference to the foregoing claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended to be a waiver of such subject matter, nor should it be considered that the applicant has not considered such subject matter to be part of the disclosed inventive subject matter.

Claims

1. An electrochemical measurement device for material corrosion in a circulating water system, characterized in that Comprising an electrochemical test container (1) and a rotating disk electrode (4); One side of the electrochemical test container (1) is provided with a circulating water inlet (3), and the other side of the electrochemical test container (1) is provided with a circulating water outlet (2). A working electrode test hole (19) is arranged near the bottom position of the electrochemical test container (1) on one side of the circulating water outlet (2); A reference electrode (6) and an auxiliary platinum electrode (5) are arranged at positions directly opposite to the working electrode test hole (19); The rotating disk electrode (4) is integrally disk-shaped, and the rotating disk electrode (4) is provided with a plurality of disk working electrodes made of different materials. The bottom of each electrode is welded to a copper wire, and multiple wires are aggregated into a test wire (9); There is a rotating shaft (20) at the center of the rotating disk electrode (4); The rotating disk electrode (4) is arranged at the working electrode test hole (19), and the rotation of the rotating disk electrode (4) can be controlled by rotating the rotating shaft (20) to adjust different disk working electrodes to be within the working electrode test hole (19); Four disk working electrodes are symmetrically arranged along the center of the rotating disk electrode (4), namely a first disk working electrode (7), a second disk working electrode (8), a third disk working electrode (17), and a fourth disk working electrode (18); It further includes an electrode cleaning assembly; The electrode cleaning assembly includes a demineralized water flushing pipe (12), a working electrode grinding assembly (10), and a hot air blower (11); The working electrode grinding assembly (10) is arranged at the bottom of the electrochemical test container (1), and the grinding head (21) of the working electrode grinding assembly (10) is arranged opposite to the disk working electrode on the rotating disk electrode (4) that is not placed within the working electrode test hole (19); The demineralized water flushing pipe (12) and the hot air blower (11) are respectively arranged on both sides of the working interface between the grinding head (21) and the rotating disk electrode (4); The auxiliary platinum electrode (5) is connected with an auxiliary electrode test wire (13), the reference electrode (6) is connected with a reference electrode test wire (14) for transmission, and the test wire (9) is connected with a working electrode test wire (15).

2. An electrochemical measurement device for material corrosion in a circulating water system according to claim 1, characterized in that: A working electrode test cover plate (16) for opening and closing the working electrode test hole is arranged inside the working electrode test hole (19).

3. An electrochemical measurement device for material corrosion in a circulating water system according to claim 1, characterized in that: The working electrode grinding assembly (10) is connected with a driving device for driving the working electrode grinding assembly (10) to rotate.

4. An electrochemical measurement device for material corrosion in a circulating water system according to claim 3, characterized in that: The grinding head (21) of the working electrode grinding assembly (10) has the same diameter size as the disk working electrode.

5. A method for using an electrochemical measurement device for material corrosion in a circulating water system according to any one of claims 1 to 4, characterized in that: Including the following steps: After the circulating water flows in from the inlet (3) and fills the electrochemical test container (1), it flows out from the outlet (2); Rotate the rotating disk electrode (4) so that the working electrode for testing is in a position opposite the working electrode test hole (19); during the test, the three-electrode method is used for electrochemical testing; After the test is completed, rotate the rotating disk electrode (4) to rotate the working electrode to be tested to a position opposite the working electrode test hole (19).

6. The method for using an electrochemical measurement device for material corrosion in a circulating water system according to claim 5, wherein: It further includes a step of cleaning the surface of the tested working electrode, specifically including: Use the demineralized water flushing pipe (12) to preliminarily flush the surface attachments; Rotate through the working electrode grinding assembly (10), and use the grinding head (21) to grind the surface of the working electrode to remove the surface attachments of the working electrode; Use the demineralized water flushing pipe (12) to flush the surface of the working electrode again; After flushing several times with demineralized water, turn on the hot air blower (11) to dry the surface of the working electrode.

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