CN108007853B - Corrosion test device and method for grounding material in soil simulation solution - Google Patents
Corrosion test device and method for grounding material in soil simulation solution Download PDFInfo
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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
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
Abstract
A device and a method for testing the corrosion of a grounding material in a soil simulation solution are disclosed, wherein the device comprises a soil simulation solution tank (1), a temperature control system, a gas control system, a three-electrode system and a liquid transmission system. The temperature control system comprises a heating-temperature control integrated machine (9) and a temperature sensing module (8); the gas control system comprises a gas switch (10), a gas conduit (11), an intelligent gas sensor (12), an oxygen content analysis module (6), a gas switch valve (13) and an oxygen cylinder (14); the liquid transmission system comprises an intelligent water pump (7), a soil simulation solution control valve (15), a liquid flow divider (16), an intelligent control valve, a confluence box (26) and a liquid control switch (27); the three-electrode system comprises three-electrode test zones, wherein each three-electrode test zone comprises a three-electrode intelligent rotating module (28), a grounding material working electrode (29), a reference electrode (30), an auxiliary electrode (31) and an intelligent rotating module motor (32).
Description
Technical Field
The invention relates to a device and a method for testing corrosion of a grounding material in a soil simulation solution, and belongs to the technical field of grounding.
Background
Corrosion of metallic materials in soil is one of the serious corrosion problems of metals. The grounding grid is used as one of a plurality of links for guaranteeing safe and stable operation of power grid equipment, and the operation reliability of the grounding grid is directly related to the safe operation of the power grid. The research on metal corrosion is of great significance, and the soil corrosion test method mainly comprises a field embedding test piece method and a laboratory simulation acceleration method.
The on-site embedding test piece method is the most classical soil corrosivity research method, and can reliably obtain corrosion data such as corrosion rate, corrosion type, corrosion mechanism and the like of different materials in different soil environments. The results of relevant tests carried out by M.Romanoff and the like show that the relation between the corrosion rate of the grounding material in the soil and the embedding time is the change trend that the corrosion rate is increased and then decreased along with the lengthening of the embedding time, and the service life of the grounding material is deduced from the change trend.
The laboratory simulation acceleration method is a buried test under laboratory conditions, controls main variable factors, has the characteristics of accurate parameter measurement, simple test operation, short test period and the like, and mainly comprises the following methods:
the galvanic acceleration method is to use two materials with a certain potential difference to carry out short circuit in soil to form a galvanic corrosion battery, thereby increasing the corrosion rate of the test piece in the soil. However, the introduction of galvanic current has a great influence on the corrosion mechanism and the corrosion behavior.
The electrolytic weight loss method is to promote the electrolytic process of the material in the soil by artificial impressed current or voltage or changing the area ratio of the cathode and the anode of the corrosion test piece, and the like, thereby achieving the purpose of accelerating the corrosion. However, the corrosion mechanism and the appearance of the corrosion product are different from the situation in the actual soil, so that the correlation between the simulation test and the corrosion in the actual environment is poor.
The soil accelerated test method is carried out in a constant temperature and humidity box, generally adopts actual soil, does not introduce other ions, and accelerates the corrosion process by controlling the water content and the temperature change of the test soil.
Disclosure of Invention
The invention aims to provide a device and a method for testing the corrosion of a grounding material in a soil simulation solution, aiming at the problems of the existing soil corrosion test method and researching the simulation and acceleration of the soil simulation solution and the influence of various corrosion factors on the corrosion of the grounding material.
The technical scheme for realizing the invention is that the device for testing the corrosion of the grounding material in the soil simulation solution comprises a soil simulation solution tank, a temperature control system, a gas control system, a three-electrode system and a liquid transmission system. The temperature control system is used for monitoring and controlling the temperature of the soil simulation solution in the soil simulation solution tank; the gas control system is used for monitoring and controlling the oxygen content of the soil simulation solution in the soil simulation solution tank; the three-electrode system is used for monitoring the corrosion degree of the grounding material working electrode; the liquid delivery system is used to control and monitor the flow rate of the soil simulating solution in the three-electrode test zone.
The temperature control system comprises a heating-temperature control integrated machine and a temperature sensing module; the gas control system comprises a gas switch, a gas conduit, an intelligent gas sensor, an oxygen content analysis module and an oxygen bottle; the liquid transmission system comprises an intelligent water pump, a soil simulation solution control valve, a liquid flow divider, an intelligent control valve, an intelligent liquid flow meter, a confluence box and a liquid control switch; the three-electrode system comprises three-electrode test areas, wherein each three-electrode test area comprises a three-electrode intelligent rotating module, a grounding material working electrode, a reference electrode, an auxiliary electrode and an intelligent rotating module motor.
The soil simulation solution tank is filled with a soil simulation solution; an intelligent water pump arranged in the soil simulation solution tank injects simulation solution into the liquid diverter through a pipeline; the liquid flow divider is divided into three outlet pipelines, and the three outlet pipelines respectively inject simulation solutions into a first three-electrode test area, a first three-electrode test area and a third three-electrode test area through a first intelligent control valve and a first intelligent liquid flow meter, a second intelligent control valve, a second intelligent liquid flow meter and a third intelligent liquid flow meter which are connected in series; the water outlet of the confluence box flows back to the soil simulation solution tank through a pipeline; the oxygen cylinder is connected with the intelligent gas sensor through a gas switch valve; the intelligent gas sensor is connected with a gas switch at the lower part of the soil simulation solution tank through a gas pipeline; an oxygen content analysis module and a temperature sensing module are arranged in the soil simulation solution box; and the bottom of the soil simulation solution tank is provided with a heating-temperature control integrated machine for regulating the temperature of the soil simulation solution in the soil simulation solution tank.
The three-electrode intelligent rotating module comprises three mounting grooves for mounting and fixing a grounding material working electrode, a reference electrode and an auxiliary electrode respectively; the grounding material working electrode, the reference electrode and the auxiliary electrode form a three-electrode structure, are led out through a lead and are connected with the electrochemical workstation; the three-electrode intelligent rotating module is externally connected with an intelligent rotating motor; the three-electrode intelligent rotating module and the intelligent rotating motor are in signal connection with a computer so as to control and monitor the angle of the three-electrode intelligent rotating module, namely the angle between the working electrode of the grounding material and the water flow direction.
The heating-temperature control integrated machine and the temperature sensing module are in signal connection with a computer and can automatically control and monitor the temperature of the soil simulation solution.
The intelligent gas sensor and the oxygen content analysis module are in signal connection with a computer and can automatically control and monitor the oxygen content of the soil simulation solution.
The liquid flow divider is provided with three branches, the intelligent control valve and the intelligent liquid flow meter are in signal connection with a computer, and the flow speed of the soil simulation solution in the three-electrode test areas can be automatically controlled and monitored.
The soil simulation solution tank is sealed and corrosion-resistant, and the working temperature is 25-80 ℃.
When the device is used for researching the corrosion characteristics of different grounding materials in the soil simulation solution, a plurality of working electrodes of different grounding materials can be prepared to respectively form a three-electrode system, the working electrodes are randomly and respectively placed in a three-electrode test area, other conditions of the test are controlled to be unchanged, and the electrochemical parameters of the working electrodes are measured.
When the device is used for researching the corrosion characteristics of the flowing speed of the soil simulation solution on the grounding material, three groups of working electrodes made of the same grounding material are prepared to respectively form a three-electrode system, the three-electrode system is randomly and respectively placed in a three-electrode test area, an intelligent control valve is adjusted, the flow of the soil simulation solution in the three-electrode test area is changed, other conditions of the test are controlled to be unchanged, and the electrochemical parameters of the three-electrode system are measured.
The device provided by the invention is used for researching the relation corrosion characteristics of the flowing direction of the soil simulation solution and the angle of the grounding material, preparing three groups of same grounding material working electrodes to respectively form a three-electrode system, randomly and respectively placing the three-electrode system in a three-electrode test area, adjusting a three-electrode intelligent rotating module, changing the angle between the grounding material working electrode and the flowing direction of the soil simulation solution, controlling other conditions of the test to be unchanged, and measuring the electrochemical parameters of the grounding material working electrode.
The invention discloses a method for testing corrosion of a grounding material in a soil simulation solution, which comprises the following steps of:
(1) preparing a corresponding soil simulation solution according to the soil physicochemical property of a certain transformer substation;
(2) according to the corrosion test device structure, a corrosion test device platform is built;
(3) preparing a working electrode of a tested grounding material, welding a lead on the back surface, and sealing the non-working surface by epoxy resin;
(4) forming a three-electrode system by the working electrode of the tested grounding material, the reference working electrode and the auxiliary electrode; respectively placing the three-electrode system in a three-electrode test area;
(5) controlling corrosion test conditions, wherein the working surface of the grounding material working electrode is vertical to the flowing direction of the soil simulation solution, the temperature of the soil simulation solution is kept constant at 30 +/-0.1 ℃, the oxygen content of the soil simulation solution is 20mg/L +/-1 mg/L, and the flow rate of the soil simulation solution is 0.2 m/s; and the conditions of the three-electrode test area are kept consistent;
(6) setting test parameters of the flowing direction of the soil simulation solution, the temperature of the soil simulation solution, the oxygen content of the soil simulation solution and the flow rate of the soil simulation solution, and maintaining for 5 min; the whole system reaches the conditions set by the test, and then the electrochemical test is started to measure the electrochemical parameters of different grounding materials;
(7) analyzing the corrosion rule and mechanism of different grounding materials in the soil simulation solution according to the corrosion parameters of the working electrodes of the different grounding materials and by using a corrosion weight loss means;
the method can respectively carry out corrosion tests on the grounding material under the conditions of changing the flowing speed of the soil simulation solution, changing the PH value of the soil simulation solution, changing the temperature of the soil simulation solution and changing the oxygen content of the soil simulation solution; the method is used for researching the corrosion characteristics of the flow speed of the soil simulation solution, the temperature of the soil simulation solution and the oxygen content of the soil simulation solution on the grounding material, and researching the corrosion characteristics of the relation between the flow direction of the soil simulation solution and the angle of the grounding material.
The device has the beneficial effects that the device provides reliable guarantee for researches on corrosion life of the grounding material in the soil simulation solution and the like, can be used for researching corrosion characteristics of different grounding materials in the soil simulation solution, and researching the corrosion characteristics of the grounding material such as the flowing speed of the soil simulation solution, the pH value of the soil simulation solution, the temperature of the soil simulation solution, the oxygen content of the soil simulation solution and the like; and researching the relation corrosion characteristics of the flowing direction of the soil simulation solution and the angle of the grounding material.
Drawings
FIG. 1 is a schematic structural view of a test apparatus according to the present invention;
FIG. 2 is a schematic side view of a three-electrode test zone according to the present invention;
in the figure, 1 is a soil simulation solution tank, 2 is a liquid inlet, 3 is a liquid inlet switch, 4 is a liquid outlet switch, 5 is a liquid outlet, 6 is an oxygen content analysis module, 7 is an intelligent water pump, 8 is a temperature sensing module, 9 is a heating-temperature control integrated machine, 10 is a gas switch, 11 is a gas conduit, 12 is an intelligent gas sensor, 13 is a gas switch valve, 14 is a gas cylinder, 15 is a soil simulation solution control valve, 16 is a liquid flow divider, 17 is a first intelligent control valve, 18 is a second intelligent control valve, 19 is a third intelligent control valve, 20 is a third intelligent liquid flow meter, 21 is a second intelligent liquid flow meter, 22 is a first intelligent liquid flow meter, 23 is a third electrode test area, 24 is a second three electrode test area, 25 is a first three electrode test area, 26 is a confluence tank, and 27 is a liquid control switch; 28 is a three-electrode intelligent rotating module, 29 is a grounding material working electrode, 30 is a reference electrode, 31 is an auxiliary electrode, and 32 is an intelligent rotating module motor.
Detailed Description
A specific embodiment of the present invention is shown in fig. 1.
The device for testing the corrosion of the grounding material in the soil simulation solution comprises a soil simulation solution tank, a temperature control system, a gas control system, a three-electrode system and a liquid transmission system.
The temperature control system in the embodiment comprises a heating-temperature control integrated machine 9 and a temperature sensing module 8; the gas control system comprises a gas switch 10, a gas conduit 11, an intelligent gas sensor 12, an oxygen content analysis module 6, a gas switch valve 13 and an oxygen cylinder 14; the liquid transmission system comprises an intelligent water pump 7, a soil simulation solution control valve 15, a liquid flow divider 16, a first intelligent control valve 17, a second intelligent control valve 18, a third intelligent control valve 19, a first intelligent liquid flow meter 22, a second intelligent liquid flow meter 21, a third intelligent liquid flow meter 20, a liquid control switch 27 and a confluence box; the three-electrode system comprises a first three-electrode test zone 25, a second three-electrode test zone 24 and a third three-electrode test zone 23; each three-electrode test zone includes a three-electrode intelligent rotating module 28, a grounded material working electrode 29, a reference electrode 30, an auxiliary electrode 31, and an intelligent rotating module motor 32.
The soil simulation solution tank 1 top of this embodiment sets up inlet 2, and inlet department 2 sets up inlet switch 3, and the below sets up liquid outlet 5, and the liquid outlet sets up out liquid switch 4.
The temperature control system of the embodiment comprises a heating-temperature control integrated machine 9 and a temperature sensing module 8, wherein the heating-temperature control integrated machine 9 is arranged at the bottom end of the soil simulation solution tank 1, and the temperature sensing module 8 is arranged in the soil simulation solution tank 1; the heating-control integrated machine 9 and the temperature sensing module 8 are connected with a computer, and the temperature of the soil simulation solution is controlled and monitored through the computer.
The gas control system of the embodiment comprises a gas switch 10, a gas conduit 11, an intelligent gas sensor 12, an oxygen content analysis module 6, a gas switch valve 13 and an oxygen cylinder 14; the oxygen content analysis module 6 is placed in the soil simulation solution, a gas conduit 11 is communicated with the bottom end of the soil simulation solution tank, a gas switch 10 is arranged between the gas conduit 11 and the bottom end of the soil simulation solution tank, the gas conduit 11 is communicated with an intelligent gas sensor 12 through an intelligent gas valve 13, and the intelligent gas sensor 12 is communicated with an oxygen cylinder 14; the oxygen content analysis module 6 is connected with a computer through a lead and an intelligent gas sensor 12, and controls and detects the oxygen content of the soil simulation solution through the computer.
The liquid transmission system of the embodiment comprises an intelligent water pump 7, a soil simulation solution control valve 15, a liquid splitter 16, a first intelligent control valve 17, a second intelligent control valve 18, a third intelligent control valve 19, a first intelligent liquid flow meter 22, a second intelligent liquid flow meter 21, a third intelligent liquid flow meter 20, a confluence box 26 and a liquid control switch 27, wherein the intelligent water pump 7 is placed in the soil simulation solution, the intelligent water pump 7 is connected with the liquid splitter 16, and the soil simulation solution control valve 15 is arranged between the intelligent water pump 7 and the liquid splitter; the liquid flow divider 16 is provided with three branches, wherein each branch is respectively provided with a branch formed by connecting a first intelligent control valve 17, a first intelligent liquid flow meter 22 and a first three-electrode test area 25 in series, a second intelligent control valve 18, a second intelligent liquid flow meter 21, a second three-electrode test area 24 in series, and a third intelligent control valve 19, a third intelligent liquid flow meter 20 and a third three-electrode test area 23 in series; a confluence box 26 is arranged at the tail end of the three branches, and a liquid control switch 27 is arranged between the confluence box 26 and the soil simulation solution box 1; the intelligent control valve and the intelligent liquid flowmeter are in signal connection with a computer to control and monitor the flow speed of the soil simulation solution in the three-electrode test area.
The three-electrode system of this embodiment includes a first three-electrode test zone 25, a second three-electrode test zone 24, and a third three-electrode test zone 23.
As shown in fig. 2, each three-electrode test zone includes a three-electrode intelligent rotating module 28, a grounded material working electrode 29, a reference electrode 30, an auxiliary electrode 31, and an intelligent rotating module motor 32. The three-electrode intelligent rotating module 28 comprises three mounting grooves for mounting and fixing a grounding material working electrode 29, a reference electrode 30 and an auxiliary electrode 31 respectively. The grounding material working electrode 29, the reference electrode 30 and the auxiliary electrode 31 form three electrodes, are led out through a lead and are connected with an electrochemical workstation; the three-electrode intelligent rotating module is externally connected with an intelligent rotating motor 32, the three-electrode intelligent rotating module 28 and the intelligent rotating motor 32 are in signal connection with a computer, so that the angle of the three-electrode intelligent rotating module 28, namely the angle between the grounding material working electrode 29 and the water flow direction, can be controlled and monitored.
The method for testing the corrosion of the grounding material in the soil simulation solution comprises the following steps:
(1) preparing a soil simulation solution and a grounding material working electrode;
(2) placing the soil simulation solution into a soil simulation solution tank in a soil simulation solution corrosion test device; installing a grounded material working electrode in a three-electrode intelligent rotating module of the device; installing a three-electrode system;
(3) checking whether the temperature control system, the gas control system and the liquid transmission system are normal;
(4) setting test parameters of a soil simulation solution test temperature, a soil simulation solution oxygen content, a soil simulation solution flow speed and a grounding material working electrode angle through a computer;
(5) when the preset test condition is reached, starting the test;
(6) measuring the corrosion parameters of the working electrodes of the grounding materials through an electrochemical workstation;
(7) according to the corrosion weight loss measurement means, the corrosion rule and mechanism of the grounding material in the soil simulation solution are researched and analyzed.
In order to further illustrate the present invention, the following will describe in detail the device and method for testing the corrosion of a grounding material in a soil simulation solution according to the present invention with reference to specific examples, which should not be construed as limiting the scope of the present invention.
Example 1: and (3) respectively carrying out corrosion tests on the three grounding materials with the components of the soil simulation solution unchanged, and comparing the corrosion degrees.
According to the characteristics of soil physicochemical properties and the like of a certain transformer substation, corresponding soil simulation solutions are prepared, and the components are shown in table 1.
TABLE 1 soil simulation solution composition
| NaCl | CaCl2 | MgSO4·7H2O | NaHCO3 | Na2SO4 | KNO3 | pH |
| 0.0502g/L | 0.0109g/L | 0.0201g/L | 0.0139g/L | 0.0158g/L | 0.0301g/L | 4.04 |
And (3) building a test device platform according to the structural schematic diagram 1 of the test device.
Preparing a Q235 steel working electrode, a galvanized steel working electrode and a copper-clad steel working electrode, wherein the working areas are all 1cm2The back is welded with a lead, and the non-working surface is sealed by epoxy resin. And the three types of working electrodes are respectively arranged in the working electrode mounting grooves of the three-electrode intelligent rotating module, and the reference electrode and the auxiliary electrode are respectively arranged in respective mounting grooves to form a three-group three-electrode system.
And controlling the intelligent rotating module motor and the three-electrode intelligent rotating module to ensure that the working surfaces of the three types of working electrodes are vertical to the flowing direction of the soil simulation solution.
And controlling the heating-temperature control integrated machine and the temperature sensing module to keep the temperature of the soil simulation solution constant at 30 +/-0.1 ℃.
And controlling the oxygen content analysis simulation and the intelligent gas sensor to ensure that the oxygen content of the soil simulation solution is 20mg/L +/-1 mg/L.
And controlling the intelligent control valve and the intelligent liquid flowmeter to enable the flow speed of the soil simulation solution flowing through the working electrode to be 0.2 m/s.
And (5) measuring the electrochemical parameters of the three types of grounding materials when the set test parameters are reached and maintained for 5 min.
After the corrosion test is finished, the corrosion current density obtained by fitting the polarization curve is shown in table 2, and it can be known from table 2 that the corrosion resistance of copper-clad steel is the best, the corrosion resistance of zinc-coated steel is the second best, and the corrosion resistance of Q235 steel is poor. The reason is that the obvious passivation phenomenon of the copper-clad steel appears in the soil simulation solution, the corrosion can be inhibited, the corrosion resistance of the matrix can be improved by the covering of the zinc layer on the surface of the galvanized steel, when the corrosion occurs, the zinc layer is firstly corroded and damaged, the matrix is protected, the anode process of the corrosion reaction of the galvanized steel in the soil simulation solution is activation control, the cathode process is joint control of the activation and diffusion processes, the Q235 steel is basically in an activation state, the covering layer of the corrosion product is easy to fall off, the compactness is reduced, and the corrosion rate is increased.
TABLE 2 polarization curve fitting corrosion current density parameter for three grounding materials
| Grounding material | Corrosion current density (. mu.A. cm)-2) |
| Q235 steel | 12.235 |
| Galvanized steel | 9.789 |
| Copper-clad steel | 3.232 |
Example 2: and changing the pH value of the soil simulation solution, and respectively carrying out corrosion tests on the three grounding materials under different pH value states of the soil simulation solution to compare the corrosion degrees.
The soil-simulating solution composition of example 1 was changed in pH by acetic acid or sodium hydroxide, and the rest was unchanged. The pH values of the soil simulation solution are respectively 5, 6, 7, 8 and 9. The corrosion test was performed under the conditions of example 1, and the corrosion current densities obtained by the polarization curve fitting after the corrosion test were completed are shown in table 3, and it is understood from table 3 that the corrosion current densities decreased and the corrosion rates decreased as the pH values increased. Under the condition, the oxygen absorption corrosion rate of the three grounding materials is less than the hydrogen evolution corrosion rate.
TABLE 3 polarization curve fitting corrosion current density parameter of grounding material in soil simulation solution with different pH values
Example 3: changing the content of the soil simulation solution, respectively carrying out corrosion tests on the three grounding materials under different soil simulation solution oxygen content states, and comparing the corrosion degrees.
The oxygen contents of the soil simulation solution in example 1 were changed to 30mg/L, 40mg/L and 50mg/L (+ -1 mg/L), respectively.
The experiment of example 1 was repeated with the other conditions unchanged.
After the corrosion test is finished, the corrosion current densities obtained by fitting the polarization curve are shown in table 4, and it can be known from table 4 that the corrosion current densities of the three grounding materials are increased and the corrosion rate is increased along with the increase of the oxygen content, which indicates that under the condition, the oxygen content is increased, the electrochemical reaction rate of the three materials is increased, and the corrosion rate is increased.
TABLE 4 polarization curve fitting corrosion current density parameter for three grounding materials with different oxygen contents
As can be seen from the corrosion test results of the above embodiments, the device and method for testing the corrosion of the grounding material in the soil simulation solution provided by the present embodiment can ensure the simulation and acceleration of the soil simulation solution, and can study the influence of each corrosion factor of the soil simulation solution on the corrosion of the grounding material.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A device for testing the corrosion of a grounding material in a soil simulation solution comprises a temperature control system, a gas control system and a three-electrode system, and is characterized by further comprising a soil simulation solution tank and a liquid transmission system; the temperature control system is used for monitoring and controlling the temperature of the soil simulation solution in the soil simulation solution tank, and comprises a heating-temperature control integrated machine and a temperature sensing module; the gas control system is used for monitoring and controlling the oxygen content of the soil simulation solution in the soil simulation solution tank, and comprises a gas switch, a gas guide pipe, an intelligent gas sensor, an oxygen content analysis module and an oxygen bottle; the three-electrode system is used for monitoring the corrosion degree of the grounding material working electrode and comprises three-electrode test areas, wherein each three-electrode test area comprises a three-electrode intelligent rotating module, a grounding material working electrode, a reference electrode, an auxiliary electrode and an intelligent rotating module motor; the liquid transmission system is used for controlling and monitoring the flow rate of the soil simulation solution in the three-electrode test area;
the liquid transmission system comprises an intelligent water pump, a soil simulation solution control valve, a liquid flow divider, an intelligent control valve, an intelligent liquid flow meter, a confluence box and a liquid control switch; the soil simulation solution tank is filled with a soil simulation solution; an intelligent water pump arranged in the soil simulation solution tank injects simulation solution into the liquid diverter through a pipeline; the liquid flow divider is divided into three outlet pipelines, and the three outlet pipelines respectively inject simulation solutions into a first three-electrode test area, a second three-electrode test area and a third three-electrode test area through a first intelligent control valve, a first intelligent liquid flow meter, a second intelligent control valve, a second intelligent liquid flow meter and a third intelligent liquid flow meter, wherein the first intelligent control valve, the second intelligent liquid flow meter and the third intelligent liquid flow meter are connected in series; and the water outlet of the confluence box flows back to the soil simulation solution tank through a pipeline.
2. The device for testing the corrosion of the grounding material in the soil simulation solution as claimed in claim 1, wherein the liquid diverter has three branches, and the intelligent control valve and the intelligent liquid flowmeter are connected with a computer signal and can automatically control and monitor the flow speed of the soil simulation solution in the three-electrode test area.
3. The device for testing the corrosion of the grounding material in the soil simulation solution according to claim 1, wherein the soil simulation solution tank is sealed and corrosion-resistant, and the working temperature is 25-80 ℃.
4. A method for testing corrosion of a grounding material in a soil simulation solution by using the testing device as claimed in any one of claims 1 to 3, wherein the method comprises the following steps of:
(1) preparing a soil simulation solution corresponding to the soil physicochemical property of a certain transformer substation, and placing the soil simulation solution in the corrosion test device according to any one of claims 1 to 3;
(2) and controlling corrosion test conditions, and carrying out corrosion test on the tested grounding material placed in the soil simulation solution.
5. The method of claim 4, wherein a lead is soldered to the back surface of the material to be tested, and the non-working surface is sealed with epoxy resin to form a working electrode of the material to be tested;
the working electrode of the tested grounding material, the reference working electrode and the auxiliary electrode form a three-electrode system, and the three-electrode system is respectively placed in a three-electrode test area in the corrosion test device.
6. The method of claim 4, wherein the step of controlling corrosion test conditions comprises:
the working surface of the working electrode of the tested grounding material is vertical to the flowing direction of the soil simulation solution;
the temperature of the soil simulation solution is kept constant at 30 +/-0.1 ℃;
the oxygen content of the soil simulation solution is 20mg/L +/-1 mg/L;
the flow rate of the soil simulation solution is 0.2 m/s;
and the conditions of the three-electrode test area are kept consistent;
setting test parameters of the flowing direction of the soil simulation solution, the temperature of the soil simulation solution, the oxygen content of the soil simulation solution and the flow rate of the soil simulation solution, and maintaining for 5 min; and (3) enabling the whole system to reach the conditions set by the test, starting the electrochemical test, and measuring the electrochemical parameters of different grounding materials.
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| CN110542644B (en) * | 2019-08-30 | 2021-12-31 | 国网河北省电力有限公司电力科学研究院 | Method for evaluating corrosion degree of trenchless grounding grid of transformer substation |
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| JPS58167948A (en) * | 1982-03-29 | 1983-10-04 | Toshiba Corp | Corrosion speed measuring instrument |
| CN103196819B (en) * | 2013-03-19 | 2015-09-30 | 哈尔滨工程大学 | A kind of deep sea environment simulation device being applicable to test material corrosion behavior |
| CN103543077B (en) * | 2013-10-24 | 2016-02-03 | 北京科技大学 | A kind of injecting type erosion corrosion test device |
| CN203658230U (en) * | 2013-11-04 | 2014-06-18 | 长沙理工大学 | Experimental device for simulating corrosion of stray current in soil on grounding grid |
| CN105223128A (en) * | 2015-09-21 | 2016-01-06 | 东南大学 | The power station flowing accelerated corrosion simulated experiment piping installation of electrochemical measurement mode |
| CN205593901U (en) * | 2016-03-28 | 2016-09-21 | 国网江西省电力科学研究院 | Corrosion test device of soil simulation solution |
| CN205719899U (en) * | 2016-05-03 | 2016-11-23 | 国网江西省电力科学研究院 | Metal corrosion test device in the Simulated Soil Solution of a kind of automatic liquid supply |
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