Reference electrode and cathodic protection system

Abstract

The application provides a reference electrode and a cathodic protection system. The reference electrode comprises a first electrode, a second electrode, a third electrode, a first insulating tube, a second insulating tube and a third insulating tube connected in sequence. The first insulating tube is provided with a first accommodating cavity, and the second insulating tube is provided with a second accommodating cavity. One of the first accommodating cavity and the second accommodating cavity contains a first solution, and the other contains a second solution. The first accommodating cavity and the second accommodating cavity are separated from each other. In the case where the temperature is greater than a threshold temperature, the unit temperature solubility change amount of the first solution and the unit temperature solubility change amount of the second solution are different. Or, in the case where the temperature is greater than the threshold temperature, the solubility of one of the first solution and the second solution increases with the increase of the temperature, and the solubility of the other decreases with the increase of the temperature. Through the above arrangement, the potential fluctuation of the reference electrode is improved, and the potential stability of the reference electrode is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrode, in particular to a reference electrode and a cathodic protection system. BACKGROUND

[0002] Cathodic protection technology is generally used to avoid or weaken metal corrosion, and its principle is to apply an external current to the surface of a corroded metal structure (such as a metal pipe buried in soil), so that the corroded metal structure becomes a cathode, thereby inhibiting the electron migration of metal corrosion.

[0003] The reference electrode is one of the important components in the cathodic protection system. It can be used to measure the potential of the protected structure, and also can be used as a signal source for automatic control of the constant potential instrument. The potential stability of the reference electrode determines the potential accuracy and stability on the working electrode.

[0004] However, in actual use, the potential of the reference electrode will drift with the increase of the use time. When the potential drift reaches a certain degree, the reference electrode needs to be replaced to ensure the accurate control of the potential on the working electrode, which affects the service life of the reference electrode and increases the use cost.

[0005] Based on the above description, how to stabilize the potential of the reference electrode has become a problem to be solved. SUMMARY

[0006] In view of this, the present application provides a reference electrode and a cathodic protection system to improve the potential stability of the reference electrode.

[0007] Specifically, the technical scheme includes the following:

[0008] In a first aspect, the present application provides a reference electrode, which includes a first electrode, a second electrode, a third electrode, and a first insulating tube, a second insulating tube and a third insulating tube connected in sequence.

[0009] The first insulating tube is provided with a first accommodating cavity, and the second insulating tube is provided with a second accommodating cavity. One of the first accommodating cavity and the second accommodating cavity contains a first solution, and the other contains a second solution. The first accommodating cavity and the second accommodating cavity are separated from each other.

[0010] The third insulating tube is provided with a third accommodating cavity, and the third electrode includes a first conductive part and a second conductive part connected in sequence. The first conductive part is accommodated in the third accommodating cavity, and the second conductive part extends into the second accommodating cavity.

[0011] One end of the second electrode is inserted into the second accommodating cavity and is arranged in a spaced manner with the second conductive part, and the other end is inserted into the first accommodating cavity.

[0012] One end of the first electrode is inserted into the first accommodating cavity and is spaced apart from the second electrode;

[0013] Wherein, in the case that the temperature is greater than a threshold temperature, the unit temperature solubility change amount of the first solution is different from that of the second solution; or, in the case that the temperature is greater than a threshold temperature, the solubility of one of the first solution and the second solution increases with the increase of temperature, and the solubility of the other decreases with the increase of temperature.

[0014] In an optional embodiment, the first solution is a saturated copper sulfate solution, and the second solution is one or more of a saturated ferrous sulfate solution, a saturated potassium sulfate solution, a saturated calcium sulfate solution, and a saturated sodium sulfate solution.

[0015] In an optional embodiment, the reference electrode further comprises a first sealing member, a second sealing member, and a third sealing member, the first sealing member is arranged at one end of the first insulating tube away from the second insulating tube, the second sealing member is arranged between the first insulating tube and the second insulating tube, and the third sealing member is arranged between the second insulating tube and the third insulating tube.

[0016] The first electrode penetrates the first sealing member, the second electrode penetrates the second sealing member, and the second conductive part penetrates the third sealing member.

[0017] In an optional embodiment, the reference electrode further comprises a blocking member, the blocking member is mounted at one end of the first sealing member away from the second insulating tube and abuts against the first sealing member.

[0018] The first electrode comprises a third conductive part and a wire part connected in series, the third conductive part is partially inserted into the first accommodating cavity, and the wire part penetrates the blocking member and is used for electrical connection with a potential testing device.

[0019] In an optional embodiment, the blocking member and the first insulating tube, the first insulating tube and the second insulating tube, and the second insulating tube and the third insulating tube are all connected in a threaded manner.

[0020] In an optional embodiment, an outer periphery of the wire part is provided with an insulating outer layer.

[0021] In an optional embodiment, the first insulating tube, the second insulating tube, the third insulating tube, and the blocking member all have a transparency less than 30%.

[0022] In an optional embodiment, cinnabar powder is added to the first solution and the second solution.

[0023] In an optional embodiment, in the case that the second solution comprises a saturated ferrous sulfate solution, vitamin C powder is further added into the second solution.

[0024] In a second aspect, the embodiments of the present application provide a reference electrode for a cathodic protection system.

[0025] The technical scheme provided by the embodiments of the present application has at least the following beneficial effects: in the case that the temperature is greater than the threshold temperature, if the unit temperature solubility variation of the first solution is different from the unit temperature solubility variation of the second solution, the concentration variation of one of the first solution and the second solution within a unit temperature is less than the concentration variation of the other within a unit temperature, the potential drift of the whole reference electrode is inhibited, which is conducive to improving the potential fluctuation of the reference electrode and improving the potential stability of the reference electrode; in the case that the temperature is greater than the threshold temperature, if the first solution and the second solution have different variation trends with temperature, the concentration of one of the first solution and the second solution increases, and the potential is negatively biased, and the concentration of the other decreases, and the potential is positively biased, the potential of the whole reference electrode is balanced, and the potential self-correction of the reference electrode is realized. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0027] Figure 1 The structure diagram of the reference electrode provided by the embodiments of the present application is shown in the figure.

[0028] Figure 2 The partial exploded view of the reference electrode provided by the embodiments of the present application is shown in the figure.

[0029] The reference numerals in the figure respectively represent:

[0030] 11-first electrode; 111-third conductive part; 112-wire part; 12-second electrode; 13-third electrode; 131-first conductive part; 132-second conductive part;

[0031] 21-first insulating tube; 211-first containing cavity; 212-first threaded hole; 22-second insulating tube; 221-second containing cavity; 222-protruding part; 23-third insulating tube; 231-third containing cavity; 232-second threaded hole;

[0032] 31-first solution; 32-second solution;

[0033] 41-First seal; 42-Second seal; 43-Third seal;

[0034] 5-Sealing component.

[0035] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] In the embodiments of this application, directional terms such as "upper," "lower," and "side" are generally used in the following ways: Figure 1 The relative positions shown are based on the given information, and these directional terms are used only to more clearly describe the relationships between structures, not to describe absolute positions. Positions may change when the product is placed in different orientations; for example, "up" and "down" may be interchanged.

[0038] Unless otherwise defined, all technical terms used in the embodiments of this application have the same meaning as commonly understood by those skilled in the art. Some technical terms appearing in the embodiments of this application are described below.

[0039] To make the technical solutions and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0040] Firstly, such as Figure 1 and Figure 2 As shown, this application provides a reference electrode for cathodic protection, including a first electrode 11, a second electrode 12, a third electrode 13, and a first insulating tube 21, a second insulating tube 22, and a third insulating tube 23 connected in sequence.

[0041] The first insulating tube 21 is provided with a first receiving cavity 211, and the second insulating tube 22 is provided with a second receiving cavity 221. One of the first receiving cavity 211 and the second receiving cavity 221 contains a first solution 31, and the other contains a second solution 32. The first receiving cavity 211 and the second receiving cavity 221 are separated from each other.

[0042] The third insulating tube 23 is provided with a third receiving cavity 231. The third electrode 13 includes a first conductive part 131 and a second conductive part 132 connected together. The first conductive part 131 is received in the third receiving cavity 231 and at least partially extends to the outside of the third insulating tube 23. The second conductive part 132 partially extends into the second receiving cavity 221.

[0043] One end of the second electrode 12 is inserted into the second receiving cavity 221 and spaced apart from the second conductive part 132, and the other end is inserted into the first receiving cavity 211.

[0044] One end of the first electrode 11 is inserted into the first receiving cavity 211 and is spaced apart from the second electrode 12.

[0045] Specifically, when the temperature is above the threshold temperature, the change in solubility per unit temperature of the first solution 31 is different from that of the second solution 32; or, when the temperature is above the threshold temperature, the solubility of one of the first solution 31 and the second solution 32 increases with increasing temperature, while the solubility of the other decreases with increasing temperature.

[0046] For example, such as Figure 1 As shown, the first insulating tube 21, the second insulating tube 22 and the third insulating tube 23 are connected sequentially from top to bottom. The two ends of the second insulating tube 22 along its length are respectively sealed to the first insulating tube 21 and the third insulating tube 23. The first receiving cavity 211 and the second receiving cavity 221 are isolated from each other and do not conduct electricity, so that the first solution 31 and the second solution 32 do not mix.

[0047] Optionally, the first insulating tube 21, the second insulating tube 22, and the third insulating tube 23 are made of insulating materials with a certain degree of hardness, such as alumina ceramics, zirconium oxide ceramics, nylon rods, rigid PVC (Polyvinyl chloride), PPR (Polypropylene-Random), etc., which have good machinability.

[0048] The first insulating tube 21 is sealed at the end opposite to the second insulating tube 22 to ensure the isolation of the reference electrode from the external environment, prevent oxygen from oxidizing the internal electrode, prevent harmful ion contamination, and prevent solution leakage.

[0049] For example, the outer contours of the cross-sections of the first insulating tube 21, the second insulating tube 22, and the third insulating tube 23 are circular. It can be understood that the cross-sections of the first insulating tube 21, the second insulating tube 22, and the third insulating tube 23 are cross-sections formed by cutting with a plane perpendicular to the length direction of the reference electrode, where the length direction of the reference electrode is... Figure 1 The vertical direction in the middle.

[0050] The second conductive part 132 of the first electrode 11, the second electrode 12 and the third electrode 13 is made of a conductive material, for example, copper.

[0051] The first conductive part 131 of the third electrode 13 penetrates the third accommodating cavity 231, and at least partially extends to the outside of the third insulating tube 23, so as to be exposed at the end of the third insulating tube 23 away from the second insulating tube 22, to contact the external medium to be measured such as soil or seawater. The second conductive part 132 is at least partially immersed in the first solution 31 or the second solution 32 in the second accommodating cavity 221.

[0052] One end of the first electrode 11 is immersed in the solution in the first accommodating cavity 211, one end of the second electrode 12 is immersed in the solution in the first accommodating cavity 211, and the other end is immersed in the solution in the second accommodating cavity 221. The arrangement of the first electrode 11, the second electrode 12 and the third electrode 13 realizes the electrical connection of the first solution 31 and the second solution 32 with the external medium to be measured, and ensures the normal operation of the cathodic protection.

[0053] The arrangement of the first electrode 11, the second electrode 12 and the third electrode 13 can connect the external medium to be measured, the first solution 31 and the second solution 32 in series under the working state of the reference electrode, to form a potential measurement path.

[0054] The threshold temperature is a critical temperature at which the reference electrode can stabilize its own potential, and the value of the threshold temperature is related to the types of the first solution 31 and the second solution 32.

[0055] In the case where the temperature is greater than the threshold temperature, if the unit temperature solubility change amount of the first solution 31 is different from the unit temperature solubility change amount of the second solution 32, the concentration change amount of one of the first solution 31 and the second solution 32 in a unit temperature is less than the concentration change amount of the other in a unit temperature, the potential drift of the reference electrode as a whole is inhibited, which is conducive to improving the potential fluctuation of the reference electrode and improving the potential stability of the reference electrode; in the case where the temperature is greater than the threshold temperature, if the first solution 31 and the second solution 32 have different change trends with temperature changes, the concentration of one of the first solution 31 and the second solution 32 increases, and the potential is negatively biased, and the concentration of the other decreases, and the potential is positively biased, the potential of the reference electrode as a whole is balanced, and the potential self-correction of the reference electrode is realized.

[0056] In one specific embodiment, the first solution 31 is a saturated copper sulfate solution, and the second solution 32 is one or more of a saturated ferrous sulfate solution, a saturated potassium sulfate solution, a saturated calcium sulfate solution and a saturated sodium sulfate solution.

[0057] Specifically, the copper sulfate solution is formed by dissolving copper sulfate powder in pure water or mineral water to form a saturated electrolyte, and the copper sulfate solution is combined with the first electrode 11 and the second electrode 12 to form an electrode; the second solution 32 is formed by dissolving one or more of ferrous sulfate powder, potassium sulfate powder, calcium sulfate powder and sodium sulfate powder in pure water or mineral water to form a saturated electrolyte, and the second solution 32 is combined with the second electrode 12 and the second conductive part 132 of the third electrode 13 to form an electrode.

[0058] For example, the first containing cavity 211 contains the first solution 31, and the second containing cavity 221 contains the second solution 32, which is a saturated ferrous sulfate solution. The second solution 32, together with the second electrode 12 and the third electrode 13, forms a copper / saturated ferrous sulfate solution reference electrode system, and the threshold temperature is about 60°C. The ferrous sulfate ion can prevent the oxidation and ionization of the second electrode 12 and the third electrode 13, which is conducive to the formation of a stable copper / saturated ferrous sulfate solution reference electrode system and improves the stability of the reference electrode. When the temperature of the first solution 31 and the second solution 32 is greater than the threshold temperature, the solubility of the first solution 31 increases with the increase of the temperature, the concentration of the first solution 31 increases, and the electrode potential formed in the first containing cavity 211 is negatively biased; while the solubility of the second solution 32 decreases with the increase of the temperature, the concentration of the second solution 32 decreases, and the electrode potential formed in the second containing cavity 221 is positively biased, which balances the negatively biased electrode potential, thereby correcting and stabilizing the reference electrode potential.

[0059] For example, the first containing cavity 211 contains the first solution 31, and the second containing cavity 221 contains the second solution 32, which is a saturated potassium sulfate or saturated calcium sulfate solution. The second solution 32, together with the second electrode 12 and the third electrode 13, forms a copper / saturated potassium sulfate solution reference electrode system or a copper / saturated calcium sulfate solution reference electrode system, and the threshold temperature is about 20°C. When the temperature of the first solution 31 and the second solution 32 is greater than the threshold temperature, the solubility of the first solution 31 increases with the increase of the temperature, the concentration of the first solution 31 increases, and the electrode potential formed in the first containing cavity 211 is negatively biased; while the change in the solubility of the second solution 32 is relatively small with the increase of the temperature, the concentration of the second solution 32 changes relatively unobviously, and the electrode potential formed in the second containing cavity 221 is stable. After the electrodes formed in the first containing cavity 211 and the second containing cavity 221 are connected in series, the potential fluctuation of the reference electrode as a whole can be suppressed, and the potential stability of the reference electrode can be improved.

[0060] Exemplarily, the first accommodating cavity 211 contains the first solution 31, and the second accommodating cavity 221 contains the second solution 32, which is a saturated sodium sulfate solution. The second solution 32, together with the second electrode 12 and the third electrode 13, forms a copper / saturated sodium sulfate solution reference electrode system, and the threshold temperature is about 40°C. Compared with the copper sulfate solution, the solubility of the sodium sulfate solution at a temperature higher than the threshold temperature is stable at a certain value. When the temperature of the first solution 31 and the second solution 32 is greater than the threshold temperature, the solubility of the first solution 31 increases with the increase of the temperature, the concentration of the first solution 31 increases, and the electrode potential formed in the first accommodating cavity 211 is negatively biased. The solubility of the second solution 32 almost does not change significantly with the increase of the temperature, and the concentration of the second solution 32 also almost does not change significantly. The electrode potential formed in the second accommodating cavity 221 is stable. After the electrode potentials formed in the first accommodating cavity 211 and the second accommodating cavity 221 are combined in series, the potential fluctuation of the reference electrode as a whole is inhibited, and the potential stability of the reference electrode is improved.

[0061] Exemplarily, the second solution 32 can also be a mixed compound solution prepared by mixing saturated ferrous sulfate solution, saturated potassium sulfate solution, saturated calcium sulfate solution and saturated sodium sulfate solution in a certain proportion.

[0062] In a further embodiment, the reference electrode further comprises a first sealing member 41, a second sealing member 42 and a third sealing member 43. The first sealing member 41 is arranged at one end of the first insulating tube 21 away from the second insulating tube 22. The second sealing member 42 is arranged between the first insulating tube 21 and the second insulating tube 22. The third sealing member 43 is arranged between the second insulating tube 22 and the third insulating tube 23. The first electrode 11 penetrates through the first sealing member 41, the second electrode 12 penetrates through the second sealing member 42, and the second conductive part 132 penetrates through the third sealing member 43.

[0063] Exemplarily, the first sealing member 41, the second sealing member 42 and the third sealing member 43 are made of non-metallic insulating materials, have the characteristics of acid and alkali resistance and high temperature resistance, are flexible and have elastic deformation ability. For example, the first sealing member 41, the second sealing member 42 and the third sealing member 43 can be made of silicone, rubber or the like.

[0064] It can be understood that the first sealing member 41, the second sealing member 42 and the third sealing member 43 are each provided with a central hole so that the first electrode 11, the second electrode 12 or the third electrode 13 can be inserted therein.

[0065] By setting the first seal 41, the second seal 42 and the third seal 43, the sealed connection between the first insulating tube 21, the second insulating tube 22 and the third insulating tube 23 is realized, preventing the joint from producing water seepage short circuit and other phenomena, causing the reference electrode test potential distortion or failure, while preventing the outside environment from causing pollution to the inside of the reference electrode, affecting the measurement accuracy.

[0066] In a further embodiment, the reference electrode further comprises a plugging piece 5 installed at the end of the first seal 41 away from the second insulating tube 22 and abutting against the first seal 41. The first electrode 11 comprises a third conductive part 111 and a wire part 112 connected thereto, the third conductive part 111 being partially inserted into the first accommodating cavity 211, and the wire part 112 being threaded through the plugging piece 5, the wire part 112 being used for electrical connection with the outside potential testing device.

[0067] As shown in Figure 1 , the plugging piece 5 is installed above the first seal 41, and the plugging piece 5 is used to isolate the inside of the reference electrode from the outside environment, avoiding the oxidation of the internal electrode by oxygen, while preventing the pollution of harmful ions and preventing the leakage of the solution.

[0068] It can be understood that the plugging piece 5 is provided with a central hole for inserting the first electrode 11.

[0069] The third conductive part 111 of the first electrode 11 has electrical conductivity and can be made of metal copper or the like. The first conductive part 131 is inserted into the solution in the first accommodating cavity 211, the wire part 112 is connected with the third conductive part 111 and is electrically connected with the potential testing device, realizing the potential measurement.

[0070] In an optional embodiment, the plugging piece 5 and the first insulating tube 21, the first insulating tube 21 and the second insulating tube 22, and the second insulating tube 22 and the third insulating tube 23 are fixedly connected by adhesion or the like.

[0071] In another optional embodiment, the plugging piece 5 and the first insulating tube 21, the first insulating tube 21 and the second insulating tube 22, and the second insulating tube 22 and the third insulating tube 23 are threadedly connected.

[0072] Under the cooperation of the threaded connection and the plurality of seals, the reference electrode not only can ensure the sealing property, but also has the advantage of convenient disassembly, and in the process of screwing, the internal air can be gradually extruded and discharged, preventing the extruded air column from causing the internal solution environment of the reference electrode to be boosted during the threaded advancement.

[0073] Exemplarily, the outer periphery of the plugging piece 5 is provided with an external thread, as shown in Figure 2As shown, both ends of the first insulating tube 21 in the length direction are provided with first threaded holes 212 with internal threads, and the connection between the plugging member 5 and the first insulating tube 21 is realized by screwing the plugging member 5 into the first threaded hole 212 above the first insulating tube 21. Figure 2 As shown, the two first threaded holes 212 of the first insulating tube 21 are respectively in communication with the first accommodating cavity 211.

[0074] Exemplarily, as shown, Figure 2 As shown, both ends of the second insulating tube 22 in the length direction are provided with protruding portions 222, the size of the protruding portion 222 is matched with the size of the first threaded hole 212 of the first insulating tube 21, and the outer periphery of the protruding portion 222 is provided with external threads, and the connection between the second insulating tube 22 and the first insulating tube 21 is realized by screwing the protruding portion 222 into the first threaded hole 212 below the first insulating tube 21.

[0075] Exemplarily, as shown, Figure 2 As shown, the third insulating tube 23 is provided with a second threaded hole 232 at one end close to the second insulating tube 22, the second threaded hole 232 is provided with internal threads, the size of the second threaded hole 232 is matched with the size of the protruding portion 222 below the second threaded hole 232, and the connection between the second insulating tube 22 and the third insulating tube 23 is realized by screwing the protruding portion 222 below the second insulating tube 22 into the second threaded hole 232. The second threaded hole 232 is in communication with the third accommodating cavity 231.

[0076] In a specific embodiment, the assembly process of the reference electrode is as follows:

[0077] The first conductive portion 131 of the third electrode 13 is embedded into the third accommodating cavity 231 of the third insulating tube 23;

[0078] The central hole of the third sealing member 43 is passed through the second conductive portion 132 of the third electrode 13 and installed in the second threaded hole 232 of the third insulating tube 23;

[0079] One of the protruding portions 222 of the second insulating tube 22 is passed through the second conductive portion 132, inserted into the second threaded hole 232 of the third insulating tube 23 and screwed, and the third sealing member 43 is deformed by extrusion during the screwing process, thereby realizing the end surface sealing of the connection between the second insulating tube 22 and the third insulating tube 23;

[0080] The prepared second solution 32 is injected into the second accommodating cavity 221 of the second insulating tube 22;

[0081] The second electrode 12 is inserted into the central hole of the second sealing member 42, and the second sealing member 42 is installed in one of the first threaded holes 212 of the first insulating tube 21,

[0082] The other protruding part 222 of the second insulation tube 22 is inserted into the first threaded hole 212 where the second seal 42 is located and is screwed tightly, so that one end of the second electrode 12 is inserted into the second accommodating cavity 221, and the second seal 42 is deformed during the screwing process, thereby realizing the end face sealing of the first insulation tube 21 and the second insulation tube 22, and the deformation of the second seal 42 will squeeze the second electrode 12, thereby realizing the sealing isolation of the second seal 42 and the second insulation tube 22;

[0083] The prepared first solution 31 is injected into the first accommodating cavity 211;

[0084] The first seal 41 is installed in the other first threaded hole 212 of the first insulation tube;

[0085] The first electrode 11 is inserted into the first solution 31 in the first accommodating cavity 211 through the center hole of the first seal 41;

[0086] The center hole of the plugging member 5 is inserted into the first threaded hole 212 through the first electrode 11 and is screwed tightly, the first seal 41 is deformed during the screwing process, thereby realizing the end face sealing of the plugging member 5 and the first insulation tube 21, and realizing the isolation sealing of the first solution 31 in the first accommodating cavity 211 from the external environment, and during the screwing process, the air inside the reference electrode is gradually squeezed out, avoiding the increase of the internal solution environment caused by the squeezing of the air column during the advancing process.

[0087] In a specific embodiment, the first electrode 11, the second conductive part 132 and the third conductive part 111 are all made of red copper, which has good electrical conductivity, thermal conductivity and corrosion resistance, and can form a copper / saturated copper sulfate solution reference electrode system with the first solution 31 and a copper / saturated sulfate solution reference electrode system with the second solution 32.

[0088] Optionally, the first conductive part 131 of the third electrode 13 is a high-molecular conductive polymer without doped conductive metal powder, which has electrical conductivity, hydrophobicity, acid and alkali resistance, and temperature resistance of-40℃ to 200℃ after solidification.

[0089] For example, the first conductive part 131 is configured by using liquid epoxy resin, liquid polyurethane, non-metal doped conductive grease and conductive polyurethane powder in a ratio of 10ml:10ml:20ml:500mg.

[0090] During the assembly of the reference electrode, the first conductive part 131 is filled into the third accommodating cavity 231, and the first conductive part 131 is solidified and integrated with the third insulation tube 23 after solidification.

[0091] In a specific embodiment, an insulating outer layer is arranged on the outer periphery of the lead part 112 to prevent the reference electrode from leaking or short-circuiting.

[0092] Exemplarily, the first electrode 11 includes a main body made of red copper, a portion of the main body wrapped by the insulating outer layer forms the wire portion 112, and a portion of the main body exposed forms the third conductive portion 111. The diameter of the wire portion 112 is greater than the diameter of the third conductive portion 111.

[0093] Optionally, when the reference electrode is assembled, the joint between the wire portion 112 and the third conductive portion 111 is located at the middle position in the thickness direction of the first sealing member 41. When the first sealing member 41 is pressed due to the screwing of the plugging member 5 into the first threaded hole 212, the gap between the third conductive portion 111 and the insulating outer layer of the wire portion 112 can be reduced, and the sealing effect can be improved. It can be understood that the thickness direction of the first sealing member 41 is the vertical direction in the figure. Figure 1

[0094] In a specific embodiment, the first insulating tube 21, the second insulating tube 22, the third insulating tube 23, and the plugging member 5 all have a transparency less than 30%.

[0095] In this embodiment, the first insulating tube 21, the second insulating tube 22, the third insulating tube 23, and the plugging member 5 are made of a low-transparency, light-proof or low-light-transmission material. On the one hand, the low-transparency, light-proof or low-light-transmission material can prevent the sunlight from the external environment from irradiating on the first solution 31 or the second solution 32 to cause temperature rise, and affect the solubility, concentration, and potential of the reference electrode. On the other hand, the low-transparency, light-proof or low-light-transmission material can block ultraviolet rays to avoid affecting the solution components.

[0096] In a specific embodiment, cinnabar powder is added to the first solution 31 and the second solution 32. The cinnabar powder can prevent the first solution 31 and the second solution 32 from being contaminated by microorganisms and their reproduction products.

[0097] The amount of the cinnabar powder added can be set according to actual needs. For example, 5 mg to 10 mg of cinnabar powder is added to each 100 ml of solution.

[0098] Further, when the second solution 32 includes a saturated ferrous sulfate solution, vitamin C powder is added to the second solution 32. The vitamin C powder can prevent the oxidation or crystallization of ferrous ions and activate the crystalline ferrous sulfate, which is conducive to stabilizing the solution system.

[0099] The amount of the vitamin C powder added can be set according to actual needs. For example, 10 mg to 50 mg of vitamin C powder is added to each 100 ml of solution.

[0100] In a second aspect, the embodiments of the present application also provide a cathodic protection system, which includes the reference electrode provided by any of the above embodiments.

[0101] ​In this application, the terms "first" and "second" are used only for descriptive purposes and not to connote or imply relative importance. The term "plurality" refers to two or more, unless otherwise expressly specified.

[0102] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope of the application being indicated by the following claims.

[0103] It is to be understood that the application is not limited to the precise construction described in the specification and shown in the drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is limited only by the claims that follow.

Claims

1. A reference electrode, characterized in that, It includes a first electrode (11), a second electrode (12), a third electrode (13), and a first insulating tube (21), a second insulating tube (22), and a third insulating tube (23) connected in sequence; The first insulating tube (21) is provided with a first receiving cavity (211), and the second insulating tube (22) is provided with a second receiving cavity (221). One of the first receiving cavity (211) and the second receiving cavity (221) contains a first solution (31), and the other contains a second solution (32). The first receiving cavity (211) and the second receiving cavity (221) are separated from each other. The third insulating tube (23) is provided with a third receiving cavity (231). The third electrode (13) includes a first conductive part (131) and a second conductive part (132) connected together. The first conductive part (131) is received in the third receiving cavity (231) and at least partially extends to the outside of the third insulating tube (23). The second conductive part (132) partially extends into the second receiving cavity (221). One end of the second electrode (12) is inserted into the second receiving cavity (221) and spaced apart from the second conductive part (132), and the other end is inserted into the first receiving cavity (211); One end of the first electrode (11) is inserted into the first receiving cavity (211) and is spaced apart from the second electrode (12); Among them, when the temperature is greater than the threshold temperature, the change in solubility per unit temperature of the first solution (31) is different from that of the second solution (32); or, when the temperature is greater than the threshold temperature, the solubility of one of the first solution (31) and the second solution (32) increases with increasing temperature, while the solubility of the other decreases with increasing temperature.

2. The reference electrode according to claim 1, characterized in that, The first solution (31) is a saturated copper sulfate solution, and the second solution (32) is one or more of a saturated ferrous sulfate solution, a saturated potassium sulfate solution, a saturated calcium sulfate solution, and a saturated sodium sulfate solution.

3. The reference electrode according to claim 1, characterized in that, The reference electrode further includes a first sealing element (41), a second sealing element (42), and a third sealing element (43). The first sealing element (41) is disposed at one end of the first insulating tube (21) away from the second insulating tube (22). The second sealing element (42) is disposed between the first insulating tube (21) and the second insulating tube (22). The third sealing element (43) is disposed between the second insulating tube (22) and the third insulating tube (23). The first electrode (11) passes through the first sealing member (41), the second electrode (12) passes through the second sealing member (42), and the second conductive part (132) passes through the third sealing member (43).

4. The reference electrode according to claim 3, characterized in that, The reference electrode also includes a sealing element (5), which is installed on the end of the first sealing element (41) away from the second insulating tube (22) and abuts against the first sealing element (41); The first electrode (11) includes a third conductive part (111) and a wire part (112) connected together. The third conductive part (111) is partially inserted into the first receiving cavity (211), and the wire part (112) passes through the sealing member (5). The wire part (112) is used to electrically connect with the potential testing device.

5. The reference electrode according to claim 4, characterized in that, The sealing component (5) is threadedly connected to the first insulating tube (21), the first insulating tube (21) is threadedly connected to the second insulating tube (22), and the second insulating tube (22) is threadedly connected to the third insulating tube (23).

6. The reference electrode according to claim 4, characterized in that, An insulating outer layer is provided on the outer periphery of the conductor portion (112).

7. The reference electrode according to claim 4, characterized in that, The transparency of the first insulating tube (21), the second insulating tube (22), the third insulating tube (23), and the sealing member (5) is all less than 30%.

8. The reference electrode according to claim 1, characterized in that, Cinnabar powder is added to the first solution (31) and the second solution (32).

9. The reference electrode according to claim 8, characterized in that, In the case where the second solution (32) includes a saturated ferrous sulfate solution, vitamin C powder is also added to the second solution (32).

10. A cathodic protection system, characterized in that, Includes the reference electrode as described in any one of claims 1 to 9.

Images