CN116430291A - Kelvin probe measurement potential and metal corrosion potential calibration device and method - Google Patents
Kelvin probe measurement potential and metal corrosion potential calibration device and method Download PDFInfo
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- CN116430291A CN116430291A CN202310399154.1A CN202310399154A CN116430291A CN 116430291 A CN116430291 A CN 116430291A CN 202310399154 A CN202310399154 A CN 202310399154A CN 116430291 A CN116430291 A CN 116430291A
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- 239000002184 metal Substances 0.000 title claims abstract description 84
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 84
- 230000007797 corrosion Effects 0.000 title claims abstract description 60
- 238000005260 corrosion Methods 0.000 title claims abstract description 60
- 239000000523 sample Substances 0.000 title claims abstract description 57
- 238000005259 measurement Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000012360 testing method Methods 0.000 claims abstract description 61
- 239000000463 material Substances 0.000 claims abstract description 5
- 239000010949 copper Substances 0.000 claims description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 15
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical class [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims description 15
- 239000011701 zinc Substances 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 8
- 150000003467 sulfuric acid derivatives Chemical class 0.000 claims description 8
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 238000005498 polishing Methods 0.000 claims description 5
- 230000035945 sensitivity Effects 0.000 claims description 5
- 229910052725 zinc Inorganic materials 0.000 claims description 5
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical class [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 claims description 5
- 244000137852 Petrea volubilis Species 0.000 claims description 2
- 238000011088 calibration curve Methods 0.000 claims description 2
- JZCCFEFSEZPSOG-UHFFFAOYSA-L copper(II) sulfate pentahydrate Chemical compound O.O.O.O.O.[Cu+2].[O-]S([O-])(=O)=O JZCCFEFSEZPSOG-UHFFFAOYSA-L 0.000 claims description 2
- 238000003754 machining Methods 0.000 claims description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 2
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 125000006850 spacer group Chemical group 0.000 claims 2
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical class [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 abstract description 5
- 239000007769 metal material Substances 0.000 abstract description 5
- 239000010959 steel Substances 0.000 abstract description 5
- 238000012864 cross contamination Methods 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000012216 screening Methods 0.000 abstract description 3
- 238000011161 development Methods 0.000 abstract description 2
- 238000011156 evaluation Methods 0.000 abstract description 2
- 238000000840 electrochemical analysis Methods 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 21
- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical class O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000012266 salt solution Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 238000004441 surface measurement Methods 0.000 description 1
- RZLVQBNCHSJZPX-UHFFFAOYSA-L zinc sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Zn+2].[O-]S([O-])(=O)=O RZLVQBNCHSJZPX-UHFFFAOYSA-L 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
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Abstract
The invention belongs to the technical field of electrochemical test, and particularly relates to a device and a method for calibrating Kelvin probe measurement potential and metal corrosion potential, wherein the main structure of the device comprises an insulating clamping seat, a metal test box arranged on the insulating clamping seat and a reference electrode arranged on the metal test box; the device has simple structure, simple and convenient operation, no cross contamination phenomenon in the measurement process, solves the problem of influence of human factors and environmental factors on SKP potential measurement values in the measurement process, improves the accuracy of test results and the accuracy of metal material corrosion resistance screening results, and provides important references for the development of novel steel varieties, the selection of engineering structural design materials and the evaluation of steel service life.
Description
Technical field:
the invention belongs to the technical field of electrochemical testing, and particularly relates to a device and a method for calibrating a Kelvin probe measurement potential and a metal corrosion potential, which calibrate a SKP probe and accurately evaluate the corrosion resistance of metal.
The background technology is as follows:
the Scanning Kelvin Probe (SKP) can be used for potential measurement of a metal surface, is a rapid and sensitive nondestructive monitoring technology, can not contact the surface of a sample to be detected, and is widely applied to corrosion detection, corrosion monitoring and the like by detecting the electronic work function of the metal surface under the air or vacuum condition through a vibrating capacitance probe. The micro-area electrochemical system SKP module is adopted to detect the voltaic potential of the metal or semiconductor surface in the simulated common atmosphere environment and the simulated marine atmosphere environment based on the conditions of no damage and no contact, and the pitting probability or corrosion resistance of the metal material is evaluated, so that the human error can be effectively reduced; the SKP module can be used for measuring the potential of different samples, and the quick screening of the corrosion resistance of the samples of different materials is realized through high-flux in-situ nondestructive detection; the SKP module can be used for evaluating the cathode stripping degradation of the coating and the repair performance of the self-repair coating; the SKP module can be used for measuring the hydrogen diffusion coefficient of the high-strength steel. Major factors affecting the accuracy of SKP probe potential measurements include probe size, probe distance from the sample surface, and ambient factors (temperature and humidity). Therefore, the calibration of the electric potential is an essential step before the Kelvin probe is used, the SKP electric potential is generally in linear relation with the metal corrosion electric potential, and the calibration of the SKP electric potential and the corrosion electric potential is a basic premise for guaranteeing the accuracy of measured data.
Stratmann et al describe metal corrosionThere is a linear relationship between the etching potential (or open circuit potential) and the scanning kelvin probe measurement potential:
in the method, in the process of the invention,
E corr representing the corrosion potential of the sample,
representing the voltaic potential difference between the probe and the sample obtained by scanning Kelvin probe measurements, the A value can be obtained by simultaneously measuring E corr And->
For a particular model of probe, by setting the probe-to-sample distance and the particular sensitivity range of the instrument. The calibrated Kelvin probe can be used to assess the corrosion tendency of metallic materials.
The calibration method commonly used in the prior art is to connect the rear parts of three metal plates (pure copper plate, pure iron plate and pure zinc plate) with the same size through solder, connect a wire for connecting a SKP sample and a working electrode for open-circuit potential measurement to the rear part of a ternary metal sample, package and polish. And respectively dripping saturated copper sulfate, saturated ferrous sulfate and saturated zinc sulfate solutions onto the surfaces of the pure copper plate, the pure iron plate and the pure zinc plate during the test, respectively measuring the SKP potential and the open circuit potential after the dripping is finished, and calibrating the obtained SKP potential and open circuit potential of different metals. However, it has the obvious disadvantages of: firstly, directional polishing treatment is needed before three-clock metal sample surface measurement, and because the metal samples are closely arranged, cross contamination is easy to occur in the polishing process, and the potential distribution of the metal surface is influenced; secondly, when saturated metal salt solution is dripped, improper operation easily causes mixing between different solutions or crossing the boundary to different metal substrates; thirdly, the height of liquid drops formed by the saturated salt solution dropwise added on the surface of the metal sample is too low, and when the reference electrode is placed in the solution, the liquid is easy to expand and overflow to pollute the adjacent metal substrate.
Therefore, the device and the method for calibrating the measuring potential and the metal corrosion potential of the Kelvin probe are developed and designed, and the phenomenon of cross contamination in the measuring process is avoided.
The invention comprises the following steps:
the invention aims to overcome the defects of the prior art, and develops and designs a device and a method for calibrating the measured potential of a Kelvin probe and the corrosion potential of metal, so as to eliminate the difference of the SKP potential measured value caused by the influence of human factors and environmental factors in the measuring process.
In order to achieve the above purpose, the main structure of the Kelvin probe measurement potential and metal corrosion potential calibration device according to the present invention includes an insulating clamping seat, a metal test box disposed on the insulating clamping seat, and a reference electrode disposed on the metal test box; the insulating cassette comprises a plurality of U-shaped structure's draw-in groove, is provided with the fixed plate in the draw-in groove, and the back and the fixed plate of metal test box pass through bolt and gasket connection, and the top surface is provided with the round hole, and the front is provided with the reference electrode, and the reference electrode passes through PVC bolted connection with the metal test box to pass through the metal test box.
The size of the metal test box is 25mm multiplied by 15mm, and the materials comprise pure copper (99.9%), pure iron (99.5%) and pure zinc (99.9%); the bolts and the gaskets are made of metal materials, and the gaskets have the functions of fixing the bolts and connecting the test wires; the reference electrode comprises a solid reference electrode.
The specific technical process of the Kelvin probe measurement potential and metal corrosion potential calibration method comprises the following steps:
Firstly, polishing a round hole;
then, mounting the metal test box on the insulating clamping seat, and leveling;
finally, a reference electrode is arranged on the metal test box;
Firstly, preparing a saturated sulfate solution;
then, dripping the saturated sulfate solution into the round hole;
finally, connecting the metal test box with the SKP potential measuring device, and connecting the reference electrode with the corrosion potential measuring device;
Firstly, starting a SKP potential measuring device, and moving a probe to a position 100 mu m above the liquid level center of the saturated sulfate solution;
then, setting the amplitude, frequency and sensitivity of the SKP potential measuring device;
finally, measuring Cu/CuSO by using SKP potential measuring device 4 、Fe/FeSO 4 Or Zn/ZnSO 4 SKP potential of the electrode;
Measurement of Cu/CuSO by corrosion potential measurement device 4 、Fe/FeSO 4 Or Zn/ZnSO 4 Corrosion potential of the electrode;
And (5) performing calibration curves on the SKP potential and the corrosion potential which are obtained through measurement.
The saturated sulfate solution comprises a saturated copper sulfate solution, a saturated ferrous sulfate solution and a saturated zinc sulfate solution.
Compared with the prior art, the main structure of the Kelvin probe measuring potential and metal corrosion potential calibrating device comprises an insulating clamping seat, a metal test box arranged on the insulating clamping seat, and a reference electrode arranged on the metal test box, wherein the Kelvin probe measuring potential and metal corrosion potential calibrating method comprises five steps of installation, preparation, SKP potential testing, corrosion potential testing and calibration; the device has simple structure, simple and convenient operation, no cross contamination phenomenon in the measurement process, solves the problem of influence of human factors and environmental factors on SKP potential measurement values in the measurement process, improves the accuracy of test results and the accuracy of metal material corrosion resistance screening results, and provides important references for the development of novel steel varieties, the selection of engineering structural design materials and the evaluation of steel service life.
Description of the drawings:
fig. 1 is a schematic diagram of the principle of the main structure of the device for calibrating the measuring potential and the metal corrosion potential of the kelvin probe according to the present invention.
Fig. 2 is a schematic diagram of a partial structure of a device for calibrating a kelvin probe measurement potential and a metal corrosion potential according to the present invention.
FIG. 3 is a schematic diagram showing the use state of the Kelvin probe measurement potential and metal corrosion potential calibration device according to the present invention.
FIG. 4 is a graph of calibration of SKP potential versus corrosion potential measured with a 250 μm probe in accordance with the present invention.
FIG. 5 is a graph of calibration of SKP potential versus corrosion potential measured with a 500 μm probe according to the present invention.
The specific implementation method comprises the following steps:
the invention will be further described with reference to the accompanying drawings and specific embodiments.
Example 1:
the main structure of the Kelvin probe measuring potential and metal corrosion potential calibrating device related to the embodiment comprises an insulating clamping seat 1, a clamping groove 2, a metal test box 3, a fixing plate 4, a bolt 5, a gasket 6, a round hole 7, a reference electrode 8 and a PVC bolt 9; the insulating cassette 1 comprises draw-in groove 2 of three U-shaped structure, be provided with metal test case 3 and fixed plate 4 in the draw-in groove 2, the back of metal test case 3 passes through bolt 5 with fixed plate 4 and is connected, and still be provided with gasket 6 between metal test case 3 and the bolt 5, round hole 7 has been seted up at the top surface center of metal test case 3, the front is provided with reference electrode 8, one end of reference electrode 8 is in the inside of metal test case 3, the other end is in the outside of metal test case 3, metal test case 3 passes through PVC bolt 9 with reference electrode 8 and is connected.
The back of the metal test box 3 related to the embodiment is provided with a threaded hole with the diameter of 2.5mm and the depth of 2.5mm so as to be connected with the fixed plate 4 through the bolt 5 and the gasket 6, and the front is provided with a through threaded slot with the notch diameter of 5mm so as to be connected with the reference electrode 8 through the PVC bolt 9; the round hole 7 has a diameter of 10mm and a depth of 10mm and is formed by machining.
The specific technical process of the Kelvin probe measurement potential and metal corrosion potential calibration method related to the embodiment comprises the following steps:
Firstly, polishing the round hole 7 to 1200 meshes through silicon carbide sand paper;
then, the metal test box 3 made of pure copper is connected with the fixed plate 4 through the bolt 5 and the gasket 6, and is arranged on the insulating clamping seat 1 and leveled through a level meter;
finally, a reference electrode 8 is arranged on the metal test box 3 through a PVC bolt 9;
Firstly, preparing a blue saturated copper sulfate solution by using copper sulfate pentahydrate;
then, dripping the saturated copper sulfate solution into the round hole 7 by a pipette, so that the round hole 7 is just full of the saturated copper sulfate solution, and no saturated copper sulfate solution overflows;
finally, the gasket 6 is connected with the SKP potential measuring device through a test wire, and the reference electrode 8 is connected with the corrosion potential measuring device through a test wire;
Firstly, starting a SKP potential measuring device, moving a 500 mu m probe to the central position of a saturated copper sulfate solution, gradually approaching the liquid level, and stopping moving when the bottom end of the probe is 100 mu m away from the liquid level;
then, the amplitude of the SKP potential measuring device was set to 30 μm, the frequency was set to 80Hz, and the sensitivity was set to 1mV;
finally, measuring Cu/CuSO by using SKP potential measuring device 4 SKP potential of the electrode;
Measurement of Cu/CuSO by corrosion potential measurement device 4 Corrosion potential of the electrode;
For the Cu/CuSO obtained by measurement 4 The SKP potential and corrosion potential of the electrodes are calibrated.
Example 2:
the main structure of the kelvin probe measurement potential and metal corrosion potential calibration device according to this embodiment is the same as that of embodiment 1.
The specific process of the kelvin probe measurement potential and metal corrosion potential calibration method according to this embodiment is different from that of embodiment 1 in that:
the metal test box 3 made of pure copper related to step 1 is replaced by the metal test box 3 made of pure iron;
the 500 μm probe involved in step 3 was replaced with a 250 μm probe.
Example 3:
the main structure of the kelvin probe measurement potential and metal corrosion potential calibration device according to this embodiment is the same as that of embodiment 1.
The specific process of the kelvin probe measurement potential and metal corrosion potential calibration method according to this embodiment is different from that of embodiment 1 in that:
the metal test box 3 made of pure copper related to step 1 is replaced by a metal test box 3 made of pure zinc;
Claims (8)
1. The utility model provides a Kelvin probe measuring potential and metal corrosion potential calibrating device, the major structure includes insulating cassette, and the metal test case that sets up on it, and the reference electrode that sets up on the metal test case, its characterized in that, insulating cassette comprises the draw-in groove of a plurality of U-shaped structure, be provided with the fixed plate in the draw-in groove, the back and the fixed plate of metal test case pass through the bolt and the gasket is connected, the top surface is provided with the round hole, the front is provided with the reference electrode, reference electrode and metal test case pass through PVC bolted connection, and pass through the metal test case.
2. The device for calibrating the measuring potential and the metal corrosion potential of the Kelvin probe according to claim 1, wherein a threaded hole with the diameter of 2.5mm and the depth of 2.5mm is arranged on the back surface of the metal test box, so as to be connected with the fixed plate through a bolt and a gasket, a through threaded slot with the notch diameter of 5mm is arranged on the front surface, so as to be connected with the reference electrode through a PVC bolt, and the dimensions of the metal test box are 25mm multiplied by 15mm, and the material comprises pure copper, pure iron and pure zinc.
3. The device for calibrating a measured potential and a metal corrosion potential of a Kelvin probe according to claim 1, wherein the bolt and the spacer are made of metal, and the spacer has the functions of fixing the bolt and connecting the test wire.
4. The device for calibrating the measured potential and the metal corrosion potential of the Kelvin probe according to claim 1, wherein the diameter of the round hole is 10mm, and the depth is 10mm, and the round hole is formed by machining.
5. The device of claim 1, wherein the reference electrode comprises a solid reference electrode.
6. The method for calibrating the measured potential and the metal corrosion potential of the Kelvin probe is characterized by comprising the following steps of:
step 1, mounting
Firstly, polishing a round hole;
then, mounting the metal test box on the insulating clamping seat, and leveling;
finally, a reference electrode is arranged on the metal test box;
step 2, preparing
Firstly, preparing a saturated sulfate solution;
then, dripping the saturated sulfate solution into the round hole;
finally, connecting the metal test box with the SKP potential measuring device, and connecting the reference electrode 8 with the corrosion potential measuring device;
step 3, testing SKP potential
Firstly, starting a SKP potential measuring device, and moving a probe to a position 100 mu m above the liquid level center of the saturated sulfate solution;
then, setting the amplitude, frequency and sensitivity of the SKP potential measuring device;
finally, measuring Cu/CuSO by using SKP potential measuring device 4 、Fe/FeSO 4 Or Zn/ZnSO 4 SKP potential of the electrode;
step 4, testing corrosion potential
Measurement of Cu/CuSO by corrosion potential measurement device 4 、Fe/FeSO 4 Or Zn/ZnSO 4 Corrosion potential of the electrode;
step 5, calibrating
And (5) performing calibration curves on the SKP potential and the corrosion potential which are obtained through measurement.
7. The method for calibrating a measured potential and a metal corrosion potential of a kelvin probe according to claim 6, wherein the specific process comprises the steps of:
step 1, mounting
Firstly, polishing round holes to 1200 meshes through silicon carbide sand paper;
then, connecting a metal test box made of pure copper with a fixed plate through bolts and gaskets, mounting the metal test box on an insulating clamping seat, and leveling through a level meter;
finally, a reference electrode is arranged on the metal test box through a PVC bolt;
step 2, preparing
Firstly, preparing a blue saturated copper sulfate solution by using copper sulfate pentahydrate;
then, dripping the saturated copper sulfate solution into the round hole through a pipette, so that the round hole is just full of the saturated copper sulfate solution, and no saturated copper sulfate solution overflows;
finally, the gasket is connected with the SKP potential measuring device through a test wire, and the reference electrode is connected with the corrosion potential measuring device through the test wire;
step 3, testing SKP potential
Firstly, starting a SKP potential measuring device, moving a 500-mu m or 250-mu m probe to the central position of a saturated copper sulfate solution, gradually approaching the liquid level, and stopping moving when the bottom end of the probe is 100 mu m away from the liquid level;
then, the amplitude of the SKP potential measuring device was set to 30 μm, the frequency was set to 80Hz, and the sensitivity was set to 1mV;
finally, measuring Cu/CuSO by using SKP potential measuring device 4 SKP potential of the electrode;
step 4, testing corrosion potential
Measurement of Cu/CuSO by corrosion potential measurement device 4 Corrosion potential of the electrode;
step 5, calibrating
For the Cu/CuSO obtained by measurement 4 The SKP potential and corrosion potential of the electrodes are calibrated.
8. The method for calibrating a kelvin probe measurement potential and a metal corrosion potential according to claim 6 or 7, wherein the saturated sulfate solution comprises a saturated copper sulfate solution, a saturated ferrous sulfate solution, and a saturated zinc sulfate solution.
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| CN202310399154.1A CN116430291A (en) | 2023-04-14 | 2023-04-14 | Kelvin probe measurement potential and metal corrosion potential calibration device and method |
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