CN204758463U - A half solid -state reference electrode for metal soil corrosion electrochemistry system - Google Patents
A half solid -state reference electrode for metal soil corrosion electrochemistry system Download PDFInfo
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- CN204758463U CN204758463U CN201520460941.3U CN201520460941U CN204758463U CN 204758463 U CN204758463 U CN 204758463U CN 201520460941 U CN201520460941 U CN 201520460941U CN 204758463 U CN204758463 U CN 204758463U
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Abstract
The utility model discloses a half solid -state reference electrode for metal soil corrosion electrochemistry system, including salt bridge, electrode chamber and electrode inner core, the salt bridge includes the polytetrafluoroethylene shell of circular tubular structure, and its vertical middle position is provided with saturated electrolyte room, and saturated electrolyte wherein is half solid state's saturated potassium nitrate or saturated potassium chloride, the tip of this saturation electrolyte room is provided with porous psammitolite A, porous psammitolite A's top directly contacts with soil. The electrode chamber is connected with the polytetrafluoroethylene shell through the screw thread, the electrode inner core is connected with the electrode chamber through the screw thread. The utility model discloses an in the soil medium long period run and constantly change guarantee reference electrode and salt bridge under the temperature condition in the good seal of electrolyte to it goes on smoothly to have guaranteed corrosion of metals electricity chemistry experiment's in the soil medium accuracy.
Description
Technical field
The utility model, about Soil Corrosion electrochemical testing device, particularly relates to a kind of contrast electrode for the metal erosion electrochemical test system in soil media.
Background technology
The metallic conduits such as gas pipeline, petroleum pipe line, municipal water supply pipeline are embedded in underground throughout the year, suffer serious soil corrosion, Soil Corrosion makes pipeline effective thickness reduce, when pipeline pressure exceedes pipeline compressive strength, the event such as booster and pipeline network leak may be produced, cause certain economic loss, the soil corrosion characteristic therefore studying metal has great importance.
Electrochemical means measures corrosion of metal characteristic, due to its fast and accurately feature find broad application.Contrast electrode in Soil Corrosion electrochemical measurement system is mainly saturated calomel electrode and Ag/AgCl electrode, and on electrode tip, supporting salt bridge is to reduce measuring error.Because electrolytic solution in contrast electrode and salt bridge is liquid condition, being placed in soil media for a long time can run off, and affects experiment measuring, therefore studies a kind of contrast electrode applying to soil media metal erosion electrochemistry experiment and has great importance.
Summary of the invention
The purpose of this utility model, be overcome existing electrochemical metal corrosive property measure in the electrolytic solution of salt bridge of contrast electrode easily to run off in soil media, affect the defect of experiment measuring effect, there is provided one can carry out for a long time testing and under the kinds of experiments condition such as to heat, the electrolytic solution realizing contrast electrode and salt bridge in electro-chemical systems does not run off, can ensure the contrast electrode of measurement accuracy.
The utility model is achieved by following technical solution:
For a semisolid contrast electrode for Soil Corrosion electro-chemical systems, comprise salt bridge, electrode chamber and electrode inner core; It is characterized in that, described salt bridge comprises teflon shell 1, and this shell is rounded cylindrical structure, and its longitudinal middle position is provided with saturated electrolyte chamber 3, and the saturated electrolyte in this saturated electrolyte chamber 3 is the saturated electrolyte of semi-solid state; The end of saturated electrolyte chamber 3 is provided with porous core A2; Porous core A2 one end of the shell of tubular structure is unlimited one end, directly contacts with soil, makes porous core A2 be placed in soil; The other end place of the saturated electrolyte chamber 3 of teflon shell 1 is provided with internal thread; One end of described electrode chamber is provided with external thread, is connected by the internal thread of external thread with teflon shell 1; Longitudinal middle position of electrode chamber is provided with electrolytic solution lumen 5, and externally threaded one end of electrode chamber of electrolytic solution lumen 5 is provided with porous core B9; The other end of electrode chamber is provided with internal thread; Described electrode inner core comprises poly-trifluoro-ethylene shell 7, and one end of poly-trifluoro-ethylene shell 7 is provided with external thread, is connected with the internal thread of electrode chamber by external thread, and poly-trifluoro-ethylene shell 7 is provided with O-ring seal 6 with the junction of electrode chamber; Longitudinal middle position of poly-trifluoro-ethylene shell 7 is provided with Ag/AgCl silk 4, and the other end of electrode inner core is provided with metallic conductor 8, and metallic conductor 8 is connected with Ag/AgCl silk 4.
Saturated electrolyte in described saturated electrolyte chamber 3 is the saturated potassium nitrate of semi-solid state or saturated potassium chloride.
Electrolytic solution in described electrolytic solution lumen 5 is KCl.
Described O-ring seal 6 is rubber seal.
Described Ag/AgCl silk 4 is the Ag silk that surface coverage AgCl.
The contrast electrode of metal erosion electro-chemical systems of the present utility model, achieve long-term operation in soil media and constantly changing the excellent sealing ensureing electrolytic solution in contrast electrode and salt bridge under temperature conditions, electrolytic solution does not run off, and ensure that in soil media, the accurate of metal erosion electrochemistry experiment carries out smoothly.
Accompanying drawing explanation
Fig. 1 is contrast electrode schematic diagram of the present utility model;
Fig. 2 is contrast electrode salt bridge schematic diagram of the present utility model;
Fig. 3 is the electrode chamber schematic diagram of contrast electrode of the present utility model;
Fig. 4 is the electrode inner core schematic diagram of contrast electrode of the present utility model.
The utility model Reference numeral is as follows:
1---teflon shell 2---porous core A
3---saturated electrolyte chamber 4---Ag/AgCl silk
5---electrolytic solution lumen 6---O-ring seal
7---poly-trifluoro-ethylene shell 8---metallic conductor
9---porous core B
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
As shown in Figure 1, the contrast electrode experimental provision for the metal erosion electro-chemical systems in soil media of the present utility model mainly comprises: salt bridge, electrode chamber and electrode inner core;
Described salt bridge comprises teflon shell 1, and this shell is rounded cylindrical structure, and its longitudinal middle position is provided with saturated electrolyte chamber 3, and the end of saturated electrolyte chamber 3 is provided with porous core A2; Porous core A2 one end of tubular structure shell is unlimited one end, and this end directly contacts with soil; The other end place of the saturated electrolyte chamber 3 of teflon shell 1 is provided with internal thread (see Fig. 2).Select the saturated potassium nitrate of semi-solid state or saturated potassium chloride according to corrosion environment the need of evading chlorion in saturated electrolyte chamber 3, the saturated potassium nitrate of semi-solid state or saturated potassium chloride are made by adding hardening agent potassium nitrate solution or Klorvess Liquid.Porous core A2 is arranged on the top of saturated electrolyte chamber 3, to prevent the loss of saturated potassium nitrate or saturated potassium chloride, porous core A2 due to the permeable electrolyte of its porous structure so can conduct electricity.
One end of described electrode chamber is provided with external thread, and electrode chamber is connected by the internal thread of external thread with teflon shell 1, and both are integrally formed; Longitudinal middle position of electrode chamber is provided with electrolytic solution lumen 5, and externally threaded one end of electrode chamber of electrolytic solution lumen 5 is provided with porous core B9; The other end of electrode chamber is provided with internal thread (see Fig. 3).KCl electrolytic solution is full of in electrolytic solution lumen 5.
Described electrode inner core comprises poly-trifluoro-ethylene shell 7, and one end of poly-trifluoro-ethylene shell 7 is provided with external thread, and electrode inner core is connected with the internal thread of electrode chamber by external thread, and electrode inner core is placed in electrode chamber; Poly-trifluoro-ethylene shell 7 is provided with rubber seal 6 with the junction of electrode chamber, to ensure to be connected imporosity between electrode chamber with electrode inner core, realizes the sealing between electrode chamber and electrode inner core, prevents the loss of electrolytic solution; Longitudinal middle position of poly-trifluoro-ethylene shell 7 is provided with Ag/AgCl silk 4, and namely surface coverage the Ag silk of AgCl.The other end of electrode inner core is provided with metallic conductor 8, and metallic conductor 8 is connected with Ag/AgCl silk 4, and metallic conductor 8 is connected (see Fig. 4) with outside electrochemical test system.
Above-mentioned preparation process, first electrode inner core and electrode chamber are assembled, be placed on again in salt bridge, rotation electrode cavity external thread and salt bridge internal thread, realize electrode chamber to be connected with salt bridge, extrude the saturated electrolyte in saturated electrolyte chamber 3 while rotating, made it fill completely whole saturated electrolyte chamber 3, to ensure not open circuit.
The electrode that the utility model compares as the reference of surveying work electrode potential when being used for metal erosion electro-chemical test in soil media, the metal measured is working electrode, working electrode and the utility model are connected to electrochemical workstation by wire and form a primary element, by measuring primary element electromotive force, using the utility model contrast electrode as benchmark, the current potential of working electrode can be calculated.In experiment, metallic conductor 8 is connected with electrochemical workstation.After primary element loop is formed, Ag/AgCl silk 4 occurs AgCl reduction reaction, and AgCl is reduced to Ag, is the positive pole of primary element; Working electrode generation burning is reacted, and is primary element negative pole, according to primary element electromotive force, can calculates working electrode corrosion potential.When the utility model uses, the top of teflon shell 1 contacts with soil, porous core A2 also contacts with soil, saturated electrolyte chamber 3 semisolid electrolyte osmosis ensures circuit not open circuit to porous core A2, in saturated electrolyte chamber 3, saturated potassium nitrate or saturated potassium chloride are due to its high concentration, the diffusion at contrast electrode and soil two new interfaces is made mainly to come from salt bridge, because in salt bridge, negative ions rate of propagation is similar, liquid junction potential is eliminated substantially, salt bridge prevents from harmful ion in soil from penetrating in electrolytic solution lumen 5 polluting electrolyte in addition.In saturated electrolyte chamber 3, semisolid electrolyte is due to its semi-solid state, does not flow, and prevents electrolyte loss in electrolytic solution lumen 5 to soil, to ensure carrying out smoothly of experiment.
A kind of semisolid contrast electrode for Soil Corrosion electro-chemical systems of the present utility model, its feature is, has used a kind of salt bridge electrolytic solution of semi-solid state, with prevent electrolyte loss in soil, impact experiment operation.Whole system is simple and convenient, can be used for the electrochemical long term monitoring of metal erosion in soil.
Claims (5)
1., for a semisolid contrast electrode for Soil Corrosion electro-chemical systems, comprise salt bridge, electrode chamber and electrode inner core; It is characterized in that, described salt bridge comprises teflon shell (1), this shell is rounded cylindrical structure, its longitudinal middle position is provided with saturated electrolyte chamber (3), and the saturated electrolyte in this saturated electrolyte chamber (3) is the saturated electrolyte of semi-solid state; The end of saturated electrolyte chamber (3) is provided with porous core A (2); Porous core A2 one end of tubular structure shell is unlimited one end, directly contacts with soil, makes porous core A (2) be placed in soil; The other end place of the saturated electrolyte chamber (3) of teflon shell (1) is provided with internal thread; One end of described electrode chamber is provided with external thread, is connected by the internal thread of external thread with teflon shell (1); Longitudinal middle position of electrode chamber is provided with electrolytic solution lumen (5), and externally threaded one end of electrode chamber of electrolytic solution lumen (5) is provided with porous core B (9); The other end of electrode chamber is provided with internal thread; Described electrode inner core comprises poly-trifluoro-ethylene shell (7), one end of poly-trifluoro-ethylene shell (7) is provided with external thread, be connected with the internal thread of electrode chamber by external thread, poly-trifluoro-ethylene shell (7) is provided with O-ring seal (6) with the junction of electrode chamber; Longitudinal middle position of poly-trifluoro-ethylene shell (7) is provided with Ag/AgCl silk (4), the other end of electrode inner core is provided with metallic conductor (8), and metallic conductor (8) is connected with Ag/AgCl silk (4).
2. a kind of semisolid contrast electrode for Soil Corrosion electro-chemical systems according to claim 1, it is characterized in that, the saturated electrolyte in described saturated electrolyte chamber (3) is the saturated potassium nitrate of semi-solid state or saturated potassium chloride.
3. a kind of semisolid contrast electrode for Soil Corrosion electro-chemical systems according to claim 1, is characterized in that, the electrolytic solution in described electrolytic solution lumen (5) is KCl.
4. a kind of semisolid contrast electrode for Soil Corrosion electro-chemical systems according to claim 1, is characterized in that, described O-ring seal (6) is rubber seal.
5. a kind of semisolid contrast electrode for Soil Corrosion electro-chemical systems according to claim 1, is characterized in that, described Ag/AgCl silk (4) the Ag silk of AgCl for surface coverage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520460941.3U CN204758463U (en) | 2015-06-30 | 2015-06-30 | A half solid -state reference electrode for metal soil corrosion electrochemistry system |
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| CN201520460941.3U CN204758463U (en) | 2015-06-30 | 2015-06-30 | A half solid -state reference electrode for metal soil corrosion electrochemistry system |
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| CN204758463U true CN204758463U (en) | 2015-11-11 |
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| CN201520460941.3U Expired - Fee Related CN204758463U (en) | 2015-06-30 | 2015-06-30 | A half solid -state reference electrode for metal soil corrosion electrochemistry system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104931412A (en) * | 2015-06-30 | 2015-09-23 | 天津大学 | Semisolid reference electrode used for metal soil corrosion electrochemical system |
| CN105891097A (en) * | 2016-05-26 | 2016-08-24 | 天津大学 | Sensor for measuring corrosion of outer wall of metal tube |
| CN106841341A (en) * | 2017-03-23 | 2017-06-13 | 天津大学 | A kind of built-in Ag/AgCl reference electrodes for electrochemical measurement |
| CN107436283A (en) * | 2016-05-26 | 2017-12-05 | 天津大学 | A kind of method for detecting metal pipe line outer wall corrosion |
| WO2020087144A1 (en) * | 2018-10-29 | 2020-05-07 | Vidya Corrosão Engenharia Ltda | Structural arrangement for a sensor/probe for measuring corrosion rate by using electrical resistance |
-
2015
- 2015-06-30 CN CN201520460941.3U patent/CN204758463U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104931412A (en) * | 2015-06-30 | 2015-09-23 | 天津大学 | Semisolid reference electrode used for metal soil corrosion electrochemical system |
| CN105891097A (en) * | 2016-05-26 | 2016-08-24 | 天津大学 | Sensor for measuring corrosion of outer wall of metal tube |
| CN107436283A (en) * | 2016-05-26 | 2017-12-05 | 天津大学 | A kind of method for detecting metal pipe line outer wall corrosion |
| CN105891097B (en) * | 2016-05-26 | 2019-04-23 | 天津大学 | It is a kind of for measuring the sensor of metal tube outer wall corrosion |
| CN107436283B (en) * | 2016-05-26 | 2019-05-21 | 天津大学 | A method of detection metal pipe line outer wall corrosion |
| CN106841341A (en) * | 2017-03-23 | 2017-06-13 | 天津大学 | A kind of built-in Ag/AgCl reference electrodes for electrochemical measurement |
| WO2020087144A1 (en) * | 2018-10-29 | 2020-05-07 | Vidya Corrosão Engenharia Ltda | Structural arrangement for a sensor/probe for measuring corrosion rate by using electrical resistance |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151111 Termination date: 20170630 |