CN207066949U - Water piping system corrosion electrochemical test system is regenerated under current system - Google Patents
Water piping system corrosion electrochemical test system is regenerated under current system Download PDFInfo
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- CN207066949U CN207066949U CN201720331542.6U CN201720331542U CN207066949U CN 207066949 U CN207066949 U CN 207066949U CN 201720331542 U CN201720331542 U CN 201720331542U CN 207066949 U CN207066949 U CN 207066949U
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- 230000007797 corrosion Effects 0.000 title claims abstract description 65
- 238000005260 corrosion Methods 0.000 title claims abstract description 65
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 238000000840 electrochemical analysis Methods 0.000 title abstract description 9
- 238000012360 testing method Methods 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 24
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 24
- 230000008569 process Effects 0.000 claims abstract description 19
- 229910001141 Ductile iron Inorganic materials 0.000 claims abstract description 18
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 12
- 229910021607 Silver chloride Inorganic materials 0.000 claims abstract description 10
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 claims abstract description 10
- 229910052751 metal Inorganic materials 0.000 claims description 43
- 239000002184 metal Substances 0.000 claims description 43
- 239000004020 conductor Substances 0.000 claims description 25
- -1 polytetrafluoroethylene Polymers 0.000 claims description 24
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 24
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 24
- 239000003792 electrolyte Substances 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 9
- 229920006395 saturated elastomer Polymers 0.000 claims description 5
- 230000007246 mechanism Effects 0.000 abstract description 16
- 238000004458 analytical method Methods 0.000 abstract description 7
- 230000007547 defect Effects 0.000 abstract description 4
- 230000008929 regeneration Effects 0.000 abstract description 4
- 238000011069 regeneration method Methods 0.000 abstract description 4
- 230000003068 static effect Effects 0.000 abstract description 3
- 238000007796 conventional method Methods 0.000 abstract 1
- 230000001172 regenerating effect Effects 0.000 abstract 1
- 239000000645 desinfectant Substances 0.000 description 13
- 238000002474 experimental method Methods 0.000 description 11
- 230000010287 polarization Effects 0.000 description 8
- 238000005259 measurement Methods 0.000 description 7
- 244000005700 microbiome Species 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 5
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 4
- 229910052801 chlorine Inorganic materials 0.000 description 4
- 239000000460 chlorine Substances 0.000 description 4
- OSVXSBDYLRYLIG-UHFFFAOYSA-N chlorine dioxide Inorganic materials O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 description 4
- 230000005518 electrochemistry Effects 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000001808 coupling effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000002848 electrochemical method Methods 0.000 description 3
- 238000001453 impedance spectrum Methods 0.000 description 3
- 230000002572 peristaltic effect Effects 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- QBWCMBCROVPCKQ-UHFFFAOYSA-N chlorous acid Chemical compound OCl=O QBWCMBCROVPCKQ-UHFFFAOYSA-N 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
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- 238000001566 impedance spectroscopy Methods 0.000 description 1
- 238000012625 in-situ measurement Methods 0.000 description 1
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- 230000014759 maintenance of location Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
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- 238000009659 non-destructive testing Methods 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
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- 238000004088 simulation Methods 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Abstract
The electrochemical testing device that water piping system corrosion is regenerated under a kind of current system is the utility model is related to, to overcome conventional method to influence the defects of detailed process corrosion mechanism determines；And the defects of actual pipeline flow regime can not be preferably simulated in static electrochemical testing device, a kind of electrochemical testing device that can be real-time for a long time, lossless is provided, and then discontinuity sample test results are aided in, be advantageous to the analysis of the corrosion mechanism to regenerating water piping system under current system.For this, the technical solution adopted in the utility model is, water piping system corrosion electrochemical test system is regenerated under current system, includes ring-reactor, the motor of 1 spheroidal graphite cast-iron working electrode, the platinized platinum auxiliary electrode of 1 Ag/AgCl reference electrode and 1 purity 99.99% and 1 supporting outer wall perforate.The utility model is mainly used in the electro-chemical test of regeneration water piping system corrosion.
Description
Technical Field
The utility model relates to a flow electrochemical testing device of system's lower regeneration water piping system corruption can be used to the real-time, the nondestructive monitoring of system's lower pipeline corrosion mechanism that flows. In particular to a device for electrochemically testing corrosion of a regenerated water pipeline system under a flowing system.
Background
The electrochemical method is an important method for researching the metal corrosion process, and aims to disclose a corrosion mechanism and explore a corrosion rule by researching the electrochemical change process of a metal/electrolyte interface (double electric layers). Corrosion electrochemical measurement techniques have many advantages over other physical or chemical research methods. Firstly, the method is an in-situ measurement technology, and cannot damage and destroy a working electrode; meanwhile, the test speed is high, and the test sensitivity is high; the instantaneous corrosion change condition of the corrosion metal electrode under the influence of external conditions can be measured; and the change of the corrosion condition of the metal surface can be continuously observed. Therefore, the research on the corrosion characteristics of the metal by using the electrochemical testing device is of great significance.
The annular reactor is an important device for researching pipeline corrosion, which is applied more at present, but is mainly used for measuring uniform corrosion rate, and monitoring SEM and XRD of corrosion products on the surface of a metal hanging piece in a discontinuous and irregular sampling mode, so that the corrosion condition of a system cannot be monitored in real time. Therefore, the research designs the electrochemical testing electrode which can be arranged on the outer wall of the annular reactor on the basis of the annular reactor, and can carry out real-time and nondestructive monitoring on the basis that the annular reactor is always in a flowing state, which has important significance for really understanding and explaining the corrosion mechanism.
Disclosure of Invention
In order to overcome the defects of the prior art, the utility model aims to overcome the defects that the traditional annular reactor device can only sample and analyze irregularly and discontinuously, and the corrosion mechanism determination in the concrete process is influenced; and the static electrochemical testing device can not better simulate the flowing state of the actual pipeline, so that the electrochemical testing device which can realize long-term real-time and nondestructive testing is provided, the intermittent sampling test result is further assisted, and the analysis of the corrosion mechanism of the sewage system of the flowing system is facilitated. Therefore, the technical scheme adopted by the utility model is that the electrochemical testing device for the corrosion of the regenerated water pipeline system under the flowing system comprises 1 nodular cast iron working electrode, 1 Ag/AgCl reference electrode, 1 platinum sheet auxiliary electrode with the purity of 99.99 percent, and 1 matched annular reactor with an outer wall provided with a hole and a motor; wherein,
the working electrode is a nodular cast iron cylindrical electrode, the outer surface of the working electrode is provided with a polytetrafluoroethylene material seal, one side of the working electrode is provided with a hard metal conductor joint which is convenient to be connected with an external electrochemical testing device, and the middle of the working electrode is connected with the hard metal conductor joint and the nodular cast iron electrode on the other side by a metal lead and is encapsulated in the polytetrafluoroethylene material;
the reference electrode adopts a polytetrafluoroethylene cylindrical barrel-shaped shell, and an electrolyte chamber is arranged at the longitudinal middle position of the cylinder; a saturated Ag/AgCl electrolyte is arranged in the electrolyte chamber, and the electrode cavity is hermetically connected with the polytetrafluoroethylene shell through threads; a hard metal conductor joint is arranged on the other side of the electrode; the middle of the reference electrode is connected with the electrolyte chamber of the reference electrode and the hard metal conductor joint by a metal lead;
the auxiliary electrode adopts a platinum sheet with the purity of 99.99 percent, and is also packaged by a polytetrafluoroethylene shell, the other side of the auxiliary electrode is provided with a hard metal conductor joint, and the middle of the auxiliary electrode adopts a metal lead to connect the platinum sheet of the auxiliary electrode and the metal conductor joint and is packaged in the polytetrafluoroethylene material;
wherein, the working surfaces of the working electrode, the reference electrode and the auxiliary electrode are all tightly attached to the inner wall of the pipeline; and is connected with the outer wall of the annular reactor through the thread of the encapsulated polytetrafluoroethylene shell; the 3 electrodes and the annular reactor filled with the reclaimed water form a complete electrolytic cell, only 3 hard metal conductor joints in the whole system are exposed outside and are connected with an electrochemical testing device to test the current condition in the corrosion process,
the annular reactor is internally provided with a rotary drum, the rotary drum is internally provided with hanging pieces, and the rotary drum is externally connected with a motor.
The utility model discloses a characteristics and beneficial effect are:
1. the utility model relates to a regenerated water pipeline system corrosion electrochemical testing device under the flowing system, which can carry out real-time and nondestructive electrochemical monitoring on the corrosion condition of a nodular cast iron electrode in an annular reactor, so as to more accurately probe the corrosion process and mechanism of a regenerated water pipeline;
2. the working electrode of the utility model can perform nondestructive monitoring on the continuously growing corrosion scale layer, thereby assisting in periodically taking out the microscopic morphology of the corrosion scale layer on the metal hanging piece and performing comprehensive analysis on crystal scaling, and greatly improving the accuracy of analysis in the corrosion process;
3. the utility model discloses the device can be used to the measurement of electrochemistry system under the multiple operating mode, if the control experiment of throwing disinfectant, throw disinfectant experiment, disinfectant and microorganism coupling effect measurement such as down experiment, can be accurate obtain multiple electrochemistry data, such as polarization curve, alternating current impedance, linear volt-ampere analysis etc. so that the corrosion mechanism of nodular cast iron pipeline when multiple medium coexists of better analysis;
4. the utility model has the advantages that the working electrode manufacturing method is standard and feasible, the reaction area is convenient to calculate, the whole system is stable and easy to control, and the accuracy and the normalization of the corrosion electrochemical measurement can be greatly improved;
5. the utility model discloses the working electrode sectional area is little, thickness is thin, the main part volume is less, has avoided using the operation that other sectional areas are great or the great working electrode of thickness needs the cutting for follow-up experimental operation that utilizes large-scale instrument to detect coating micro-morphology is more convenient, swift, is convenient for synthesize and uses multiple detection method, analyzes the micro-morphology characteristic and the local corrosion characteristic of regeneration water pipeline better.
Description of the drawings:
FIG. 1 is a diagram of a working electrode, a reference electrode and an auxiliary electrode of the electrochemical testing device for corrosion of a reclaimed water pipeline under a flow system of the utility model; wherein, a is a working electrode, b is a reference electrode, and c is an auxiliary electrode.
FIG. 2 is a schematic diagram of the present invention of a loop reactor equipped with a three-electrode system.
FIG. 3 is a schematic view of a loop reactor equipped with a three-electrode system in connection with an external electrochemical test apparatus;
FIG. 4 is a polarization curve measured according to an embodiment of the present invention;
fig. 5 is an ac impedance spectrogram obtained by the measurement of the present invention.
Detailed Description
A device for electrochemically testing corrosion of a regenerated water pipeline system under a flowing system comprises a self-made reference electrode, a working electrode, an auxiliary electrode and a matched annular reactor. The method is characterized in that:
1. the working electrode in the device is made of the same nodular cast iron material as the hanging pieces in the annular reactor drum and is cut and polished into 0.65cm2Size; and is encapsulated by a polytetrafluoroethylene shell (the height is about 4.0cm), the polytetrafluoroethylene shell of the installed working electrode is also connected with the outer wall of the annular reactor through threads and forms a whole with the tube wall; the other side of the electrode is provided with a hard metal conductor joint, so that the electrochemical test is convenient to carry out; the middle part adopts a metal lead to connect the nodular cast iron electrode and the hard metal conductor joint and is encapsulated inside the polytetrafluoroethylene material so as to be conductive;
2. the reference electrode of the device adopts a saturated Ag/AgCl electrode, and is packaged in the inner cavity of a polytetrafluoroethylene cylindrical barrel-shaped shell in order to prevent the loss of an Ag/AgCl solution, and a part of inner core is left to be in contact with the electrolyte in the reactor; the Ag/AgCl electrode has very good electrode potential repeatability and stability, provides a stable electrode potential in the measurement process, and the reference electrode basically has no current passing through and is used for forming a loop with the working electrode to measure the electrode potential of the working electrode; the inner cavity filled with the saturated Ag/AgCl solution is connected with the polytetrafluoroethylene shell through threads (the height is about 8.0 cm); the other side of the electrode is provided with a hard metal conductor joint, so that the electrochemical test is convenient to carry out; the middle part adopts a metal lead to connect the electrolyte chamber of the reference electrode and the hard metal conductor joint so as to conduct electricity; the polytetrafluoroethylene outer shell provided with the reference electrode inner core is connected with the outer wall of the annular reactor through threads and is integrated with the pipe wall, and the electrode with constant potential is used as a reference in the whole test system;
3. the auxiliary electrode is 1.0cm2The platinum sheet with the purity of 99.99 percent is also packaged by a polytetrafluoroethylene shell (the height is about 5.0cm), and the polytetrafluoroethylene shell of the auxiliary electrode is also connected with the outer wall of the annular reactor through threads to form a whole with the tube wall; the other side of the electrode is provided with a hard metal conductor joint, so that the electrochemical test is convenient to carry out; the middle of the metal lead is connected with a platinum sheet of the auxiliary electrode and a metal conductor joint and is encapsulated in the polytetrafluoroethylene material so as to be conductive; the auxiliary electrode has a larger surface area than the working electrode so that externally applied polarization acts mainly on the working electrode; the auxiliary electrode has the function of forming a loop which can allow current to pass through in the whole test system, and the stable current cannot pass through only one circuit outside the electrode; in addition, considering that the width of the auxiliary electrode platinum sheet is larger, the auxiliary electrode platinum sheet is directly arranged in the annular reactor and is easy to prevent the growth of a thicker corrosion scale layer on the later nodular cast iron hanging sheet, so the auxiliary electrode platinum sheet is flattened and tightly attached to the wall of the inner pipe; the other side of the electrode is also provided with a hard metal conductor joint, so that the electrochemical test is convenient to carry out;
4. considering the narrow distance between the rotary drum and the outer wall in the reactor, the working surfaces of the working electrode, the reference electrode and the auxiliary electrode are all tightly attached to the inner wall of the pipeline; and is connected with the outer wall of the annular reactor through the thread of the encapsulated polytetrafluoroethylene shell; the 3 electrodes and the annular reactor filled with the regenerated water form a complete electrolytic cell, and only 3 hard metal conductor joints connected with the 3 electrodes through leads are exposed outside in the whole system and are connected with an electrochemical testing device.
5. The three electrodes and the annular reactor filled with regenerated water as electrolyte form a complete primary battery system (current passes through during corrosion); the length of the hard metal conductor joint is 2cm, and the tail end of the hard metal conductor joint is exposed and connected with a lead of an external electrochemical measuring device; the device is used for measuring the current and resistance conditions generated in the corrosion process and indirectly reflecting the corrosion process through a polarization curve and alternating current impedance; the overall connection and the test device are shown in figure 3.
Taking the three-electrode system installed on the annular reactor as an example, the corrosion mechanism in the regenerated water pipeline system under the action of the disinfectant and the microbial system is simulated. A 1.5L annular reactor is adopted to simulate a reclaimed water pipeline system, and all components of the annular reactor are sterilized by an ultraviolet lamp for 30min on a super clean bench before use due to the consideration of the action of microorganisms; then all parts are assembled, and the reactor is firstly washed once by using absolute ethyl alcohol, and then regenerated water is fed; wherein, the nodular cast iron hanging pieces are hung on a rotary drum in the reactor and driven by a brushless direct current motor (BL 2203C manufactured by Beijing and Lithou Motor technology Co., Ltd.); the reactor is passed through a peristaltic pump (Baoding Raffet speed regulation type peristaltic pump-BT 300S) Feeding water from the bottom, and controlling the rotating speed of a rotor of a peristaltic pump to be about 1r/min so as to maintain the hydraulic retention time of the reactor to be 8 h; the rotating speed of the brushless DC motor is 0.25N/m2The flow velocity of the simulated pipe is about 0.5 m/s;
the experiment researches the corrosion mechanism of a reclaimed water pipeline system under the coupling action of a disinfectant and microorganisms, and NaClO and ClO with three concentrations of 1mg/L, 2mg/L and 4mg/L are respectively adopted2Disinfectant experiments are carried out for 30 days respectively; in the test process, the characteristics (7.8 g/cm) of the ductile iron metal material are input into an electrochemical test device (electrochemical workstation: CS350, Wuhan Keste instruments, Ltd.)3) And experimental conditions (at 25 ℃); after the open-circuit potential is stable, selecting a measurement method as polarization curve measurement, selecting a reference electrode as a saturated Ag/AgCl reference electrode, and setting a potential interval: 0.5mV, initial potential vs. open circuit potential-0.1V, termination potential vs. open circuit potential 0.1V, scan rate 05mV/s, coordinate type: potential-lg current, the measurement result is shown in fig. 4; in addition, measurement of an alternating current impedance spectrum, a test method, steady state test, impedance and frequency scanning are carried out, parameter setting is carried out, and an alternating current amplitude value: 10mv, initial frequency: 100000Hz, stop frequency: 0.01Hz, 10 points and 10 frequency doubling, and the test result is shown in figure 5;
in the whole experiment process, the working electrode, namely the nodular cast iron electrode to be detected is in contact with the regenerated water electrolyte in the annular reactor to generate corrosion reaction, so that the main component Fe of the nodular cast iron working electrode loses electrons (1-1) at the anode, the cathode obtains electrons (1-2), and the reaction of the cathode and the anode forms a primary battery to form a corrosion product (1-3) and current passes through; connecting a working electrode, a reference electrode and an auxiliary electrode with an electrochemical measuring device through a hard metal conductor joint exposed outside, wherein the working electrode and the reference electrode form a loop to monitor the corrosion condition of the working electrode, the auxiliary electrode forms a loop through current passing in the whole test system, and the electrochemical workstation can be used for testing the working electrode in a polarization curve, an alternating current impedance spectrum and the like so as to better analyze the corrosion process of the nodular cast iron;
adding NaClO and ClO2In the case of disinfectants, ClO produced by hydrolysis thereof-And ClO2The molecules directly participate in the cathode reaction process and lose electrons with the anode to obtain Fe2+Forming a layer of erosion scale (1-4; 1-5) by different reaction processes; the results show that compared with the control experiment without adding disinfectant, adding NaClO and ClO2The cathode of corrosion is promoted in the case of the disinfectant, the corrosion rate becomes higher, but for a single disinfectant species, the corrosion process becomes slower as the corrosion time increases and the corrosion scale layer accumulates on the surface of the metal hanging piece, regardless of whether the anode process of the control experiment or the disinfectant adding experiment is gradually slowed down, which is consistent with the results of the literature.
Fe→Fe2++2e-(1-1)
6Fe2++3ClO-+3H2O→2Fe(OH)3+4Fe3++3Cl-(1-4)
ClO2+5Fe2++13H2O→5Fe(OH)3+HCl+10H+(1-5)
The utility model solves the problem that the common annular reactor device in the existing reclaimed water pipeline system can not perform electrochemical monitoring in real time and without damage, and also solves the monitoring problem of the common static electrochemical system, and the simulation flow state is closer to the actual reclaimed water pipeline running condition; on the other hand, the manufacturing method of the electrode system in the device is standard and feasible, and the connection with the annular reactor is convenient to disassemble and assemble; meanwhile, the working electrode is small in sectional area, thin in thickness and small in main body size, so that the operation that other working electrodes with larger sectional areas or larger thicknesses need to be cut is avoided, the subsequent experiment operation for detecting the microscopic morphology of the coating by using a large instrument is more convenient and quicker, various detection methods are conveniently and comprehensively applied, the microscopic morphology characteristics and the local corrosion characteristics of the regenerated water pipeline are better analyzed, the corrosion condition of the regenerated water pipeline under a flowing system can be more accurately simulated, and the corrosion mechanism is more accurately explored.
The utility model is used for install the three-electrode system on the basis of cyclic annular reactor, and connect the current signal in the corrosion process to the electrochemistry workstation through the hard metal joint with the wire, through measuring polarization curve and alternating impedance spectroscopy characteristic, be used for real-time, harmless analysis corrosion electrochemistry mechanism; and the experimental process can be carried out simultaneously with the sampling of the nodular cast iron hanging pieces on the rotary drum in the reactor, so as to better combine the morphological characteristics and the crystallization state of the corrosion scale layer to analyze the corrosion mechanism. Therefore, the device is simple and convenient, realizes real-time and nondestructive detection of the corrosion state of the pipeline in the flow system, and has certain application value.
The following is an example of the present invention.
Example 1
In the urban sewage recycling-urban miscellaneous water quality, the residual chlorine content after the water in a clean water tank of a pipe network contacts for 30min is determined to be more than or equal to 1.0mg/L, and the residual chlorine content at the tail end of the pipe network is required to be more than or equal to 0.2mg/L, and the chlorine consumption is larger due to the higher concentration of AOC and suspended matters in the recycled water, so that the requirement of the residual chlorine content at the tail end of the pipe network is difficult to ensure particularly in long-distance pipeline transportation, and a large amount of microorganisms are propagated. Therefore, the subject has conducted NaClO and ClO with three concentrations of 1mg/L, 2mg/L and 4mg/L in the inlet water2The disinfectant experiment is carried out for 30 days, the diversity of microorganisms in the corrosion scale layer is determined by adopting a microorganism high-throughput sequencing means, the corrosion mechanism of a regenerated water pipeline in a flowing system under the coupling action of the disinfectant and the microorganisms is researched, and the result shows that the corrosion mechanism and the process in a polarization curve and an alternating-current impedance spectrum can be better analyzed.
Claims (1)
1. A device for electrochemically testing corrosion of a regenerated water pipeline system under a flowing system is characterized by comprising 1 nodular cast iron working electrode, 1 Ag/AgCl reference electrode, 1 platinum sheet auxiliary electrode with the purity of 99.99 percent, 1 matched annular reactor with an outer wall provided with a hole and a motor; wherein:
the working electrode is a nodular cast iron cylindrical electrode, the outer surface of the working electrode is provided with a polytetrafluoroethylene material seal, one side of the working electrode is provided with a hard metal conductor joint which is convenient to be connected with an external electrochemical testing device, and the middle of the working electrode is connected with the hard metal conductor joint and the nodular cast iron electrode on the other side by a metal lead and is encapsulated in the polytetrafluoroethylene material;
the reference electrode adopts a polytetrafluoroethylene cylindrical barrel-shaped shell, and an electrolyte chamber is arranged at the longitudinal middle position of the cylinder; a saturated Ag/AgCl electrolyte is arranged in the electrolyte chamber, and the electrode cavity is hermetically connected with the polytetrafluoroethylene shell through threads; a hard metal conductor joint is arranged on the other side of the electrode; the middle of the reference electrode is connected with the electrolyte chamber of the reference electrode and the hard metal conductor joint by a metal lead;
the auxiliary electrode adopts a platinum sheet with the purity of 99.99 percent, and is also packaged by a polytetrafluoroethylene shell, the other side of the auxiliary electrode is provided with a hard metal conductor joint, and the middle of the auxiliary electrode adopts a metal lead to connect the platinum sheet of the auxiliary electrode and the metal conductor joint and is packaged in the polytetrafluoroethylene material;
wherein, the working surfaces of the working electrode, the reference electrode and the auxiliary electrode are all tightly attached to the inner wall of the pipeline; and is connected with the outer wall of the annular reactor through the thread of the encapsulated polytetrafluoroethylene shell; the 3 electrodes and the annular reactor filled with the reclaimed water form a complete electrolytic cell, only 3 hard metal conductor joints in the whole system are exposed outside and are connected with an electrochemical testing device to test the current condition in the corrosion process,
the annular reactor is internally provided with a rotary drum, the rotary drum is internally provided with hanging pieces, and the rotary drum is externally connected with a motor.
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| CN201720331542.6U CN207066949U (en) | 2017-03-31 | 2017-03-31 | Water piping system corrosion electrochemical test system is regenerated under current system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111707606A (en) * | 2020-05-08 | 2020-09-25 | 中国船舶重工集团公司第七二五研究所 | Copper-nickel alloy pipeline internal welding heat affected zone corrosion electrochemical testing device |
| CN113237827A (en) * | 2021-06-25 | 2021-08-10 | 清华大学 | Electrochemical test system for molten salt corrosion experiment |
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2017
- 2017-03-31 CN CN201720331542.6U patent/CN207066949U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111707606A (en) * | 2020-05-08 | 2020-09-25 | 中国船舶重工集团公司第七二五研究所 | Copper-nickel alloy pipeline internal welding heat affected zone corrosion electrochemical testing device |
| CN111707606B (en) * | 2020-05-08 | 2024-03-29 | 中国船舶重工集团公司第七二五研究所 | Electrochemical testing device for corrosion of welding heat affected zone inside copper-nickel alloy pipeline |
| CN113237827A (en) * | 2021-06-25 | 2021-08-10 | 清华大学 | Electrochemical test system for molten salt corrosion experiment |
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