CN111443124A - Experimental device for stray current corrosion simulation and near-surface micro-area pH measurement - Google Patents
Experimental device for stray current corrosion simulation and near-surface micro-area pH measurement Download PDFInfo
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- CN111443124A CN111443124A CN202010329870.9A CN202010329870A CN111443124A CN 111443124 A CN111443124 A CN 111443124A CN 202010329870 A CN202010329870 A CN 202010329870A CN 111443124 A CN111443124 A CN 111443124A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
- G01N27/4166—Systems measuring a particular property of an electrolyte
- G01N27/4167—Systems measuring a particular property of an electrolyte pH
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- G—PHYSICS
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- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
- G01B17/02—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring thickness
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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
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
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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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Abstract
The invention relates to an experimental device for stray current corrosion simulation and near-surface micro-area pH measurement, which comprises a test water tank and an electrochemical workstation, wherein a working electrode with a working surface facing the inside of the test water tank is hermetically arranged on the side wall of the test water tank, an iridium/iridium oxide pH composite microelectrode with a front tip opposite to the center of the working surface of the working electrode is horizontally arranged in the test water tank, and an XYZ-axis fine tuning instrument for adjusting the distance between the tip of the iridium/iridium oxide pH composite microelectrode and the working surface of the working electrode is arranged on a cover plate of the test water tank. The invention utilizes an electrochemical workstation to output simulated stray currents with different waveforms, accurately adjusts the distance between a working electrode and an iridium/iridium oxide pH composite microelectrode through an XYZ axis fine adjustment instrument, realizes the measurement of the pH of a micro-area on the surface of a near metal, thereby obtaining parameter data of the working electrode in corrosion processes such as thickness, quality, surface electrochemical potential, surface pH, corrosion morphology and the like, and being used for the corrosion mechanism and evaluation research of the stray currents.
Description
Technical Field
The invention relates to the technical field of corrosion and protection of metal materials, in particular to an experimental device for stray current corrosion simulation and near-surface micro-area pH measurement.
Background
Urban and peripheral buried metal pipelines are often damaged by corrosion of one or more stray currents, for example, buried metal pipelines are damaged by corrosion of alternating-current stray currents due to being parallel to a high-voltage alternating-current transmission line and dynamic direct-current stray currents due to being close to track traffic such as urban subways and trams, and therefore normal operation of the buried metal pipelines is affected. The corrosion hazard degree is closely related to the type (such as fluctuation and the like) of stray current, characteristic parameters (such as amplitude, frequency and the like), duration and metal/medium interface environment, and the process of corroding electrodes under the stray current is complex, so that the detection, evaluation and prevention and control work of the corrosion is difficult to perform, and the safety management of oil and gas pipelines is seriously restricted.
Therefore, studies on the stray current mechanism and evaluation of metal materials are increasing. The stray current corrosion research adopting the field experiment method is easy to be interfered by a plurality of factors to influence the experiment effect, and the indoor simulation experiment can be adopted to independently change the experiment parameters, so that the method becomes the preferred method for the stray current corrosion research. Therefore, it is necessary to provide a stray current corrosion simulation experiment apparatus which has a simple structure and is convenient to operate and can effectively carry out the research on the corrosion electrode process.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to overcome the defects in the prior art, the invention provides an experimental device for stray current corrosion simulation and near-surface micro-area pH measurement, which solves the problems of multiple interference factors and high operation difficulty in the existing stray current corrosion field experiment and realizes the process research of stray current corrosion electrodes.
The technical scheme adopted by the invention for solving the technical problems is as follows: an experimental device for stray current corrosion simulation and near-surface micro-area pH measurement comprises a test water tank, an auxiliary water tank, an electrochemical workstation and a computer, wherein the test water tank and the auxiliary water tank are communicated, the computer is electrically connected with the electrochemical workstation, a working electrode with a working surface facing the interior of the test water tank is hermetically installed on the side wall of the test water tank, a simulated corrosion solution submerging the working electrode is contained in the test water tank, a saturated calomel electrode with the end part being parallel to the axis of the working surface of the working electrode is vertically arranged in the test water tank, a vertically-arranged platinum electrode is arranged in the auxiliary water tank, a WE interface of the electrochemical workstation is connected with the working electrode, a RE interface of the electrochemical workstation is connected with the saturated calomel electrode, a CE interface of the electrochemical workstation is connected with the platinum electrode, a sliding block is installed on a cover plate of the test water tank, an iridium/iridium oxide pH composite microelectrode which is horizontally arranged in, an XYZ axis fine tuning instrument for adjusting the distance between the tip of the iridium/iridium oxide pH composite microelectrode and the working surface of the working electrode is arranged beside the slide block.
For the thickness change of convenient real-time test working electrode among the experimentation, test basin lateral wall link firmly the ya keli board, working electrode compresses tightly on test basin lateral wall through the ya keli board is sealed, the ya keli board side is equipped with the ultrasonic thickness gauge, the test aperture that is used for ultrasonic thickness gauge test working electrode thickness change is offered at ya keli board center.
Specifically speaking, a guide rail is fixed on a cover plate of the test water tank, the XYZ axis vernier instrument is installed beside the guide rail, and the sliding block is arranged on the guide rail in a sliding manner and is fixedly connected with an iron support on the XYZ axis vernier instrument.
Furthermore, a plastic rod extending into the test water tank is fixed on the sliding block, the iridium/iridium oxide pH composite microelectrode is fixed at the lower end of the plastic rod, and the rear end of the iridium/iridium oxide pH composite microelectrode is connected with a digital multimeter for reading the potential of the iridium/iridium oxide pH composite microelectrode.
In order to accurately display the distance between the tip of the iridium/iridium oxide pH composite microelectrode and the working surface of the working electrode, a waterproof macro camera is arranged in a test water tank below the iridium/iridium oxide pH composite microelectrode, and a lens of the waterproof macro camera is aligned between the front tip of the iridium/iridium oxide pH composite microelectrode and the working surface of the working electrode.
In order to maintain the consistent height of the simulated solution in the two water tanks, the test water tank and the auxiliary water tank are communicated through a U-shaped salt bridge.
The invention has the beneficial effects that: the invention utilizes an electrochemical workstation to output simulated stray currents with different waveforms, accurately adjusts the distance between a working electrode and an iridium/iridium oxide pH composite microelectrode through an XYZ axis fine adjustment instrument, realizes the measurement of the pH of a micro-area on the surface of a near metal, thereby obtaining parameter data of the working electrode in the process of corroding the electrode, such as thickness, quality, surface electrochemical potential, surface pH, corrosion morphology and the like, and can be used for the corrosion mechanism and evaluation research of the stray current.
Drawings
The invention is further illustrated with reference to the following figures and examples.
Fig. 1 is a schematic structural view of the present invention.
In the figure: 1. the device comprises a test water tank, 2 parts of an acrylic plate, 3 parts of an auxiliary water tank, 4 parts of a waterproof gasket, 5 parts of an ultrasonic thickness gauge, 6 parts of a working electrode, 7 parts of a saturated calomel electrode, 8 parts of a U-shaped salt bridge, 9 parts of a platinum electrode, 10 parts of an electrochemical workstation, 11 parts of a computer, 12 parts of a waterproof microspur camera, 13 parts of an iridium/iridium oxide pH composite microelectrode, 14 parts of a digital multimeter, 15 parts of a guide rail, 16 parts of a sliding block, 17 parts of an XYZ axis vernier instrument and 18 parts of a plastic rod.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
The experimental apparatus for stray current corrosion simulation and near-surface micro-zone pH measurement shown in fig. 1 includes a test water tank 1, an auxiliary water tank 3, an electrochemical workstation 10 and a computer 11.
The test water tank 1 and the auxiliary water tank 3 are respectively provided with an electrode hole with the diameter of 1cm and a salt bridge hole with the diameter of 2cm on the cover plate, simulated corrosive solution is contained in the test water tank 1 and the auxiliary water tank 3, and the test water tank 1 and the auxiliary water tank 3 are communicated through a U-shaped salt bridge 8 which is arranged in the salt bridge hole in a penetrating mode.
The test basin 1 lateral wall on link firmly ya keli board 2, be equipped with working electrode 6 on the test basin 1 lateral wall, working electrode 6 is round platform shape, its working surface diameter 2cm, the cylinder thickness 4mm at working surface place, base cylinder diameter 3cm, thickness 4mm, ya keli board 2 compresses tightly working electrode 6 seal on test basin 1 lateral wall through waterproof gasket 4, the working surface of working electrode 6 contacts with simulation etchant solution in towards test basin 1.
Lie in 2 sides of inferior gram force board and be equipped with ultrasonic thickness gauge 5, the test aperture has been seted up at inferior gram force board 2 center, and the test aperture at inferior gram force board 2 center is aimed at to ultrasonic thickness gauge 5's detecting head to but ultrasonic thickness gauge 5 real-time test working electrode 6 thickness variation in the experimentation, with the better corrosion conditions of research metal.
A saturated calomel electrode 7 with the end part pointing to the working surface of the working electrode 6 is vertically arranged in the testing water tank 1, a vertically arranged platinum electrode 9 is arranged in the auxiliary water tank 1, and the saturated calomel electrode 7 and the platinum electrode 9 both extend into the corresponding water tanks through electrode holes.
The electrochemical workstation 10 is electrically connected with the computer 11, the WE interface of the electrochemical workstation 10 is connected with the working electrode 6, the RE interface of the electrochemical workstation 10 is connected with the saturated calomel electrode 7, the CE interface of the electrochemical workstation 10 is connected with the platinum electrode 9,
a guide rail 15 is fixed on a cover plate of the test water tank 1, an XYZ axis vernier instrument 17 is installed beside the guide rail 15, a sliding block 16 is arranged on the guide rail 15 in a sliding mode, and the sliding block 16 is fixedly connected with an iron support on the XYZ axis vernier instrument 17. An iridium/iridium oxide pH composite microelectrode 13 with the front tip end opposite to the center of the working surface of the working electrode 6 is horizontally arranged in the test water tank 1, a plastic rod 18 extending into the test water tank 1 is fixed on the slide block 16, the iridium/iridium oxide pH composite microelectrode 13 is fixed at the lower end of the plastic rod 18, and the slide block 16 is driven to move by an XYZ axis fine adjustment instrument 17 so as to adjust the distance between the tip end of the iridium/iridium oxide pH composite microelectrode 13 and the working surface of the working electrode 6.
The rear end of the iridium/iridium oxide pH composite microelectrode 13 is connected with a digital multimeter 14 for reading the potential of the iridium/iridium oxide pH composite microelectrode 13; a waterproof microspur camera 12 is arranged in the test water tank 1 below the iridium/iridium oxide pH composite microelectrode 13, and a lens of the waterproof microspur camera 12 is aligned between the front tip of the iridium/iridium oxide pH composite microelectrode 13 and the working surface of the working electrode 6.
The manufacturing method of the iridium/iridium oxide pH composite microelectrode 13 comprises the following steps: a. cleaning the iridium wire by ultrasonic after grinding and polishing; b. placing iridium wire in CaCl2Electrolytic corrosion in dilute hydrochloric acid corrosive liquid; c. carrying out concentrated NaOH activation treatment on the iridium wire subjected to electrolytic corrosion; d. carrying out high-temperature oxidation deionized water quenching treatment at 800 ℃ and hydrothermal hydration treatment on the activated iridium filaments, and repeating the steps for three times; f. and assembling the composite electrode to obtain the iridium/iridium oxide pH composite microelectrode 13.
During the experiment, the working electrode 6 is fixed on the side wall of the test water tank 1 through the acrylic plate 2 and the waterproof gasket 4 in a screw sealing mode, the simulated corrosive solution with the same water level is poured into the test water tank 1 and the auxiliary water tank 3 until the working electrode 6 is submerged, the test water tank 1 is communicated with the auxiliary water tank 3 through the U-shaped salt bridge 8 so as to avoid mutual interference of cathode/anode reactions, and simulated stray current is output through the electrochemical workstation 10; in the experimental process, the thickness change condition of the working electrode 6 is measured and recorded by using the ultrasonic thickness gauge 5, the waterproof microspur camera 12 determines the distance between the tip of the iridium/iridium oxide pH composite microelectrode 13 and the surface of the working electrode 6, the distance between the tip of the iridium/iridium oxide pH composite microelectrode 13 and the surface of the working electrode 6 is adjusted by using the XYZ axis fine adjustment instrument 17, the potential change of the iridium/iridium oxide pH composite microelectrode 13 is read by using the digital multimeter 14, and the surface pH change condition of the working electrode 6 is obtained. After the experiment is finished, the acrylic plate 2 is disassembled, the working electrode 6 is taken out, and the working electrode 6 can be subjected to researches such as corrosion weighing and appearance observation.
The invention can output stray currents with different waveforms, periods and amplitudes by utilizing the electrochemical workstation 10; the working electrode 6 is fixed in a pressing mode, so that the installation and the disassembly are easy, and the weighing and the corrosion appearance observation of the working electrode 6 after the experiment is finished are convenient; a small testing hole smaller than the non-working surface of the working electrode 6 is formed in the center of the acrylic plate 2, and the change condition of the thickness of the working electrode 6 in the corrosion process can be tested in real time through the ultrasonic thickness tester 5; by arranging the double water tank structure of the test water tank 1 and the auxiliary water tank 3, the working electrode 6 and the platinum electrode 9 are separated and connected with the two water tanks through the U-shaped salt bridge 8, so that mutual interference caused by cathode/anode reaction in an experiment is avoided; the iridium/iridium oxide pH composite microelectrode 13 is adopted, and the XYZ axis trimmer 17 and the waterproof microspur camera 12 are combined to realize the near surface positioning function between the working electrode 6 and the iridium/iridium oxide pH composite microelectrode 13, so that the measurement of the pH of the metal near surface micro-region can be completed.
The method can realize the corrosion simulation test of the working electrode 6 made of different metal materials in different simulation solutions under the condition of a laboratory when the working electrode is interfered by different stray currents, obtain the parameter data of the working electrode 6 in the process of corroding the electrode, such as thickness, quality, surface electrochemical potential, surface pH, corrosion morphology and the like, and can be used for the corrosion mechanism and evaluation research of the stray currents.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (6)
1. The utility model provides a stray current corrodes experimental apparatus of simulation and nearly surperficial micro-district pH measurement, is including the test basin and supplementary basin, the electrochemistry workstation that are linked together and the computer of being connected with the electrochemistry workstation electricity, characterized by: the device comprises a test water tank, a working electrode, a platinum electrode, an iridium/iridium oxide pH composite microelectrode, a working electrode, an XYZ axis fine tuning instrument and a control circuit, wherein the working electrode is arranged on the side wall of the test water tank in a sealing mode, the working surface of the working electrode faces the test water tank, simulated corrosive solution for submerging the working electrode is contained in the test water tank, a saturated calomel electrode with the end part being flush with the axis of the working surface of the working electrode is vertically arranged in the test water tank, the platinum electrode is vertically arranged in an auxiliary water tank, a WE interface of an electrochemical workstation is connected with the working electrode, a RE interface of the electrochemical workstation is connected with the saturated calomel electrode, a CE interface of the electrochemical workstation is connected with the platinum electrode, a sliding block is arranged on a cover plate of the test water tank, the sliding block is fixed in the test water tank horizontally, the.
2. The experimental facility for stray current corrosion simulation and near-surface micro-zone pH measurement according to claim 1, wherein: the testing water tank side wall fixedly connected with the acrylic plate, the working electrode is tightly pressed on the testing water tank side wall through the acrylic plate in a sealing mode, the ultrasonic thickness gauge is arranged beside the acrylic plate, and the center of the acrylic plate is provided with a testing small hole used for the ultrasonic thickness gauge to test the thickness change of the working electrode.
3. The experimental facility for stray current corrosion simulation and near-surface micro-zone pH measurement according to claim 1, wherein: a guide rail is fixed on a cover plate of the test water tank, the XYZ axis vernier instrument is installed beside the guide rail, and a sliding block is arranged on the guide rail in a sliding mode and fixedly connected with an iron support on the XYZ axis vernier instrument.
4. The experimental facility for stray current corrosion simulation and near-surface micro-zone pH measurement according to claim 3, wherein: a plastic rod extending into the test water tank is fixed on the sliding block, the iridium/iridium oxide pH composite microelectrode is fixed at the lower end of the plastic rod, and the rear end of the iridium/iridium oxide pH composite microelectrode is connected with a digital multimeter for reading the potential of the iridium/iridium oxide pH composite microelectrode.
5. The experimental facility for stray current corrosion simulation and near-surface micro-zone pH measurement according to claim 1, wherein: a waterproof microspur camera is arranged in the test water tank below the iridium/iridium oxide pH composite microelectrode, and a lens of the waterproof microspur camera is aligned between the front tip of the iridium/iridium oxide pH composite microelectrode and the working surface of the working electrode.
6. The experimental facility for stray current corrosion simulation and near-surface micro-zone pH measurement according to claim 1, wherein: the test water tank and the auxiliary water tank are communicated through a U-shaped salt bridge.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111912878A (en) * | 2020-08-04 | 2020-11-10 | 中国地质大学（北京） | Experimental measuring device for electrical parameters of seabed polymetallic sulfide rock |
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