CN114088614A - Metal component soil corrosion in-situ detection sensor - Google Patents
Metal component soil corrosion in-situ detection sensor Download PDFInfo
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- CN114088614A CN114088614A CN202111390831.0A CN202111390831A CN114088614A CN 114088614 A CN114088614 A CN 114088614A CN 202111390831 A CN202111390831 A CN 202111390831A CN 114088614 A CN114088614 A CN 114088614A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/02—Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement
Abstract
A shell penetrates through a fixing hole through a threaded fastener and then is installed on a metal component to be detected, the metal component is connected with an elastic needle to form electric connection with the metal component to be detected, a loop electrode, a constant potential electrode, a metal component connection elastic needle and an electrode lead-out wire of a shielding plate are respectively connected with a lead of electrochemical detection equipment to form a four-electrode system, the influence of a metal component excitation signal of a non-detection area on a measurement result is limited by limiting the proportion of the loop electrode to the height of the shell and increasing a grounding shielding plate, the area of a working electrode is determined, and the rapid and accurate detection of the corrosion rate of a large-size buried metal component material is realized.
Description
Technical Field
The invention relates to the technical field of corrosion detection, in particular to a soil corrosion in-situ detection sensor for a metal component.
Background
The metal component is buried underground for a long time and is influenced by corrosion factors such as chemical factors, biological factors, stray current and the like, the longer the service time is, the more easily the metal component is rusted, the longer the service time is, the longer the service time of the component is, the longer the service life of the component is, and the longer the service life of the component is influenced; the heavy metal can lead to fracture and cause safety accidents. Because the corrosion condition of the buried material is difficult to determine visually, effective protection measures cannot be taken timely, so that the potential safety hazard is increased, and the economic loss is heavy. Therefore, the corrosion condition of the metal component in the soil is accurately detected, the metal corrosion process and the residual service life are predicted in time, and the method has great significance for guaranteeing the safe and stable operation of the power grid.
At present, the buried metal components are maintained and reconstructed by adopting a regular excavation and inspection method in China. However, the excavation process is blind and limited by conditions such as time environment, and the corrosion condition of the metal component cannot be mastered in time. In recent years, excavation-free corrosion diagnosis methods have been widely studied, and mainly include analytical methods, physical analytical methods, and electrochemical detection methods. The analysis method is to comprehensively analyze various factors of the environment where the object to be detected is located, such as temperature, humidity, pH value and other factors which can influence the corrosion process of the buried metal, and then model, so as to predict the corrosion of the metal material. Compared with the method for detecting the damage, the method has the advantages of low cost and no waste. However, the method has the defects of large sampling workload, long analysis period and incapability of directly reflecting the corrosion rate of the metal. And the factors influencing the metal soil corrosion are too many, so that all corrosion factors are difficult to be considered comprehensively, and the corrosion process of the buried metal soil is difficult to be evaluated accurately.
Electrochemical corrosion is the main corrosion form of corrosion of buried metals, so the progress of soil corrosion of metallic materials can be evaluated by measuring electrochemical parameters. When the corrosion process of the grounding system is actually measured, the component to be measured is not an isolated electrode, and when the component is used as a working electrode, the area of the component is far larger than that of an auxiliary electrode. The current applied to the conductor by the auxiliary electrode is not limited in the metal section to be measured, so that the polarized metal area has uncertainty, and a large error is introduced in the calculation of the corrosion current density. Chinese patent CN104678229A discloses a corrosion monitoring sensor for transformer substation grounding grid, which uses a mode of current limiting with a small hole at the bottom and additional guard ring shielding at the side to limit the working electrode area. However, when the sensor is used, the detection result is related to the distance between the sensor and a grounding grid, the detection accuracy is poorer when the distance is longer, and the medium exchange is difficult when the distance is shorter, so that the corrosion condition of the grounding grid under the sensor is different from that of the surroundings; the essence of the guard ring shielding is to increase the area of the auxiliary electrode, so that the polarization current received by the auxiliary electrode is reduced, the area of the false working electrode is reduced, and the measurement result has larger error.
Disclosure of Invention
In order to overcome the defects of the technology, the invention provides the metal member soil corrosion in-situ detection sensor which can fully exchange media and detect the corrosion rate of a large-size metal member.
The technical scheme adopted by the invention for overcoming the technical problems is as follows:
a metal member soil corrosion in situ detection sensor, comprising:
the shell is cylindrical, the upper end and the lower end of the shell are open, a cavity is formed inside the shell, and a plurality of fixing holes are formed in the lower end of the shell along the circumferential direction;
a cross arm horizontally mounted in the cavity of the housing;
the loop electrode is of a disc-shaped structure and is arranged at the lower end of the cross arm, and a through hole I and a through hole II are formed in the loop electrode;
the metal component is connected with the elastic needle, is of a cylindrical structure, and is fixed on the cross arm after penetrating through the through hole I;
the constant potential electrode pillar is of a cylindrical structure, a cavity is formed inside the constant potential electrode pillar, the constant potential electrode pillar penetrates through the through hole II and then is fixed on the cross arm, and a constant potential electrode is installed at the lower end of the cavity of the constant potential electrode pillar; and
the annular groove is formed in an opening at the upper end of the shell, the shielding plate is embedded and fixed in the annular groove, and a plurality of through holes III are distributed in the shielding plate.
In order to improve the leakproofness, still include the annular groove that sets up in the casing bottom along the circumferencial direction, the sealing washer sets up in the annular groove.
In order to play a supporting role, the device also comprises a cylindrical column body, the upper end and the lower end of the cylindrical column body are opened, a cavity is formed inside the cylindrical column body, the lower end of the cylindrical column body is connected with the cross arm, the upper end of the cylindrical column body is connected with the shielding plate, and the electrode outgoing line connected with the elastic needle, the electrode outgoing line connected with the loop electrode and the electrode outgoing line connected with the constant potential electrode all penetrate through the cavity of the cylindrical column body and then penetrate out of the shielding plate.
Preferably, the upper end surface of the loop electrode is made of a resin material to form the closed layer, and the lower end surface of the loop electrode is made of a stainless steel material.
Preferably, the constant potential electrode is made of metal platinum, and the metal member connecting elastic needle is made of a copper gold-plated material.
Preferably, the constant potential electrode support is made of a resin material.
Preferably, the shielding plate is made of 316 stainless steel material.
Preferably, the housing is made of nylon material.
Preferably, a gap is formed between the loop electrode and the inner wall of the housing, and the gap is 5-10mm between the loop electrode and the inner wall of the housing.
Preferably, the through holes iii on the shielding plate are arranged in a concentric ring shape, and the ratio of the diameter of the through holes iii to the diameter of the circuit electrode is less than 0.025.
The invention has the beneficial effects that: the shell penetrates through the fixing hole through the threaded fastener and then is installed on the metal component to be detected, the metal component is connected with the elastic needle to form electric connection with the metal component to be detected, the loop electrode, the constant potential electrode, the metal component connection elastic needle and an electrode outgoing line of the shielding plate are respectively connected with a lead of electrochemical detection equipment to form a four-electrode system, the influence of a metal component excitation signal of a non-detection area on a measurement result is limited by limiting the proportion of the loop electrode to the height of the shell and increasing the grounding shielding plate, the area of a working electrode is determined, and the rapid and accurate detection of the corrosion rate of a large-size buried metal component material is realized.
Drawings
FIG. 1 is a cross-sectional view of a three-dimensional structure according to the present invention;
FIG. 2 is a schematic bottom view of the present invention;
FIG. 3 is a schematic top view of the present invention;
FIG. 4 is a schematic perspective view of the present invention;
in the figure, 1, a shell 2, a loop electrode 3, a constant potential electrode 4, a sealing ring 5, a shielding plate 6, a metal component, a spring needle 7, a cross arm 8, an annular groove 9, a fixing hole 10, a through hole I11, a through hole II 12, a constant potential electrode pillar 13, a through hole III 14 and a column body are connected.
Detailed Description
The invention will be further described with reference to fig. 1 to 4.
A metal member soil corrosion in situ detection sensor, comprising: the device comprises a shell 1, a plurality of fixing holes 9 and a plurality of fixing rods, wherein the shell 1 is cylindrical, the upper end and the lower end of the shell are open, a cavity is formed inside the shell, and the lower end of the shell 1 is provided with the fixing holes 9 along the circumferential direction; a cross arm 7 horizontally mounted in the cavity of the housing 1; the loop electrode 2 is of a disc-shaped structure and is arranged at the lower end of the cross arm 7, and a through hole I10 and a through hole II 11 are formed in the loop electrode 2; the metal component is connected with the elastic needle 6 which is of a cylindrical structure and fixed on the cross arm 7 after penetrating through the through hole I10; the constant potential electrode pillar 12 is of a cylindrical structure, a cavity is formed inside the constant potential electrode pillar, the constant potential electrode pillar passes through the through hole II 11 and then is fixed on the cross arm 7, and the constant potential electrode 3 is installed at the lower end of the cavity of the constant potential electrode pillar 12; and the annular groove 8 is arranged at the opening at the upper end of the shell 1, the shielding plate 5 is embedded and fixed in the annular groove 8, and a plurality of through holes III 13 are distributed on the shielding plate 5.
When the device is used, the shell 1 penetrates through the fixing hole 9 through a threaded fastener and then is installed on a metal component to be detected, the metal component is connected with the elastic needle 6 to form electric connection with the metal component to be detected, the electrode outgoing lines of the loop electrode 3, the constant potential electrode 4, the metal component connection elastic needle 6 and the shielding plate 5 are respectively connected with a lead of electrochemical detection equipment to form a four-electrode system, the influence of a metal component excitation signal of a non-detection area on a measurement result is limited by limiting the proportion of the loop electrode 2 to the height of the shell 1 and increasing the grounding shielding plate 5, the area of a working electrode is determined, and the rapid and accurate detection of the corrosion rate of a large-size buried metal component material is realized.
Example 1:
the sealing device also comprises an annular groove arranged at the bottom of the shell 1 along the circumferential direction, and the sealing ring 4 is arranged in the annular groove. The sealing ring 4 is embedded at the bottom of the shell 1, so that the bottom of the shell 1 and a zinc plate have good sealing performance in the measuring process.
Example 2:
the electrode lead-out wire connected with the elastic needle 6, the electrode lead-out wire connected with the loop electrode 2 and the electrode lead-out wire connected with the constant potential electrode 3 penetrate through the cavity of the cylinder 14 and then penetrate out of the shielding plate 5. The posts 14 not only serve to hold and support the shield 5, but also provide threading of the individual electrode lead wires.
Example 3:
the upper end surface of the loop electrode 2 is made of resin material to form a closed layer, the lower end surface of the loop electrode is made of stainless steel material, and the lower end surface made of the stainless steel material is used for forming a closed loop with a metal component to be detected and a soil medium. The constant potential electrode 3 is made of metal platinum, and the metal component connecting elastic needle 6 is made of copper gold-plated material. The constant potential electrode support 12 is made of a resin material. The shielding plate 5 is made of 316 stainless steel material and is used for shielding interference electric signals. The housing 1 is made of nylon, and the nylon is an insulating material. The specific ratio of the height of the shell 1 to the distance between the loop electrode 2 and the member is more than 10, so that the attenuation caused by the dielectric loss when the detection signal generated between the detected area member and the loop electrode 2 reaches the loop electrode 2 is far smaller than the attenuation caused by the dielectric loss when the detection signal generated between the non-detected area member and the loop electrode 2 reaches the loop electrode 2 through the medium, and the purpose of controlling the area of the working electrode is achieved.
Example 4:
a gap is formed between the loop electrode 2 and the inner wall of the shell 1, and a gap of 5-10mm is formed between the loop electrode 2 and the inner wall of the shell 1. The diameter of the constant potential electrode 3 is 10-15mm, and the diameter of the shell 1 is 6-7 cm.
Example 5:
each through hole III 13 on the shielding plate 5 is arranged in a concentric ring shape, and the ratio of the diameter of the through hole III 13 to the diameter of the loop electrode 2 is less than 0.025.
The following describes the method of using the soil corrosion in-situ detection sensor for metal members according to the present invention:
(1) the size of the sensor is determined according to the buried depth of the metal component, and the height of the metal component soil corrosion in-situ detection sensor shell 1 is smaller than the buried depth of the metal component.
(2) Polishing the surface of the metal component to be detected, removing surface rust, and adhering the metal component soil corrosion monitoring sensor to the surface of the metal component to be detected, or installing the metal component soil corrosion monitoring sensor to the surface of the metal component to be detected through a fixing hole by using a screw made of the same material as the metal component to be detected, so that the metal component connecting elastic needle 6 is electrically connected with the metal component to be detected.
(3) The sensor is completely buried in the soil medium, the inside of the sensor is filled with the soil medium, and the soil medium is compacted as much as possible, so that the soil medium inside the sensor and covering the area of the component to be measured is consistent with the surrounding soil medium environment as much as possible.
(4) And electrode outgoing lines connected with the loop electrode 2, the constant potential electrode 3, the metal component connecting elastic needle 6 and the shielding plate 5 are respectively connected with leads of electrochemical detection equipment to form a four-electrode system, wherein the metal component to be detected is taken as a working electrode, the loop electrode 2 is taken as an auxiliary electrode, the constant potential electrode 3 is taken as a reference electrode, and the shielding plate 5 is taken as a grounding electrode.
(5) And respectively measuring electrochemical parameters by using electrochemical detection equipment, and calculating the corrosion rate of the metal component.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A metal member soil corrosion in-situ detection sensor, comprising:
the shell (1) is cylindrical, the upper end and the lower end of the shell are open, a cavity is formed inside the shell, and a plurality of fixing holes (9) are formed in the lower end of the shell (1) along the circumferential direction;
a cross arm (7) horizontally mounted in the cavity of the housing (1);
the loop electrode (2) is of a disc-shaped structure and is arranged at the lower end of the cross arm (7), and a through hole I (10) and a through hole II (11) are formed in the loop electrode (2);
the metal component is connected with the elastic needle (6), the elastic needle is of a cylindrical structure, and the elastic needle penetrates through the through hole I (10) and then is fixed on the cross arm (7);
the constant potential electrode pillar (12) is of a cylindrical structure, a cavity is formed inside the constant potential electrode pillar, the constant potential electrode pillar penetrates through the through hole II (11) and then is fixed on the cross arm (7), and the constant potential electrode (3) is installed at the lower end of the cavity of the constant potential electrode pillar (12); and
the annular groove (8) is formed in an opening at the upper end of the shell (1), the shielding plate (5) is embedded and fixed in the annular groove (8), and a plurality of through holes III (13) are distributed in the shielding plate (5).
2. The metal member soil corrosion in-situ detection sensor according to claim 1, wherein: the sealing device is characterized by further comprising an annular groove arranged at the bottom of the shell (1) along the circumferential direction, and the sealing ring (4) is arranged in the annular groove.
3. The metal member soil corrosion in-situ detection sensor according to claim 1, wherein: the device is characterized by further comprising a cylindrical column body (14), wherein the upper end and the lower end of the cylindrical column body (14) are provided with openings, a cavity is formed inside the cylindrical column body, the lower end of the column body (14) is connected with the cross arm (7), the upper end of the column body is connected with the shielding plate (5), and the metal component is connected with an electrode outgoing line connected with the elastic needle (6), an electrode outgoing line connected with the loop electrode (2) and an electrode outgoing line connected with the constant potential electrode (3) all penetrate through the cavity of the column body (14) and then penetrate out of the shielding plate (5).
4. The metal member soil corrosion in-situ detection sensor according to claim 1, wherein: the upper end surface of the loop electrode (2) is made of a resin material to form a closed layer, and the lower end surface of the loop electrode is made of a stainless steel material.
5. The metal member soil corrosion in-situ detection sensor according to claim 1, wherein: the constant potential electrode (3) is made of metal platinum, and the metal component connecting elastic needle (6) is made of a copper gold-plated material.
6. The metal member soil corrosion in-situ detection sensor according to claim 1, wherein: the constant potential electrode support column (12) is made of resin materials.
7. The metal member soil corrosion in-situ detection sensor according to claim 1, wherein: the shielding plate (5) is made of 316 stainless steel materials.
8. The metal member soil corrosion in-situ detection sensor according to claim 1, wherein: the shell (1) is made of a nylon material.
9. The metal member soil corrosion in-situ detection sensor according to claim 1, wherein: a gap is formed between the loop electrode (2) and the inner wall of the shell (1), and a gap of 5-10mm is formed between the loop electrode (2) and the inner wall of the shell (1).
10. The metal member soil corrosion in-situ detection sensor according to claim 1, wherein: the through holes III (13) on the shielding plate (5) are arranged in a concentric ring shape, and the ratio of the diameter of the through holes III (13) to the diameter of the loop electrode (2) is less than 0.025.
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2021
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