CN102680543A - Sensor for electrochemical detection on surface defects of metal material and use method of sensor - Google Patents
Sensor for electrochemical detection on surface defects of metal material and use method of sensor Download PDFInfo
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- CN102680543A CN102680543A CN2012101701955A CN201210170195A CN102680543A CN 102680543 A CN102680543 A CN 102680543A CN 2012101701955 A CN2012101701955 A CN 2012101701955A CN 201210170195 A CN201210170195 A CN 201210170195A CN 102680543 A CN102680543 A CN 102680543A
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Abstract
The invention discloses a sensor for electrochemical detection on surface defects of a metal material and a use method of the sensor. The sensor comprises a PVC (Poly Vinyl Chloride) net-shaped plastic plate and a sandwich rubber, wherein the PVC net-shaped plastic plate is made from a soft round material with thickness of 4-8mm and provided with an installation hole and a reference electrode; auxiliary electrodes are symmetrically arranged at the periphery of the reference electrode; the reference electrode and the auxiliary electrodes are round and fixedly arranged on the PVC net-shaped plastic plate through the sandwich rubber; the reference electrode is a fixed Ag-AgCl electrode; and the auxiliary electrodes are the same as a detected sample in material as much as possible. The sensor can be changed at will in using shape; by detected electrochemical impedance spectrums and detected noise time domain spectrums of different parts of the sample, the parts where the surface defects are located of the sample can be determined; and the sensor and the use method of the sensor are simple in operation and strong in practicability.
Description
Technical field
The present invention relates to a kind of electrochemical method that is used to detect the metal material surface defective, specifically, relate to the technical field of the detection method of surface imperfection.
Background technology
The common lossless detection method of metal material surface defective is mainly contained magnetic detect (MT), utilize the stray field at workpiece, defect place and the interaction of magnetic, promptly utilized steel product surface and near surface flaw (like crackle; Slag inclusion, hairline etc.) difference of magnetic permeability and iron and steel magnetic permeability, rugged change will take place in the magnetic field at these discontinuous places of material, magnetization back; Form part flux leakage place surface of the work and produced stray field; Thereby the magnetic that attracts magnetic to form fault location is piled up---the magnetic trace under suitable illumination condition, shows defective locations and shape; The accumulation of these magnetics is observed and explained, just realized the magnetic detection; Infiltration detects (PT): utilize the capillarity of liquid, penetrating fluid is infiltrated solid material surface flaws place.Through developer the penetrating fluid that infiltrates is precipitate into the existence of surperficial display defect again, just realized that infiltration detects.
Except above-mentioned two kinds of detection methods; Also have EDDY CURRENT, ultrasound examination (UT) and ray detection (RT) etc.; Above-mentioned several method is all used physical principle the defective of material is detected; And ultrasound examination and ray detection all can work the mischief to human health in varying degrees, and environment is polluted.
Also the someone passes through electrochemical test method now, and the metal material surface defective is detected.Electrochemical detection method has the harmless advantage of original position, can not damage sample, and handling safety, can not cause environmental pollution, therefore, the electrochemical detection method and the equipment of development surface imperfection have very important practical significance.
Summary of the invention
The objective of the invention is; Fill up electrochemical test method for the blank that the metal material surface defective detects, a kind of sensor of having surface imperfection, new metal material surface defects detection and preparation method thereof that utilizes electrochemical impedance spectroscopy and noise time domain spectrum to analyze to determine whether is provided.
The present invention is achieved through following technical scheme.
A kind of Electrochemical Detection sensor that is used for the metal material surface defective; Comprise PVC netted plastic plate (2) and gelatin sponge (4); Described PVC netted plastic plate (2) is the rounded material of the thick softness of 4～8mm; It is provided with mounting hole (6); Be provided with contrast electrode (3) in the center mounting hole of PVC netted plastic plate (2), be provided with auxiliary electrode (5) in the mounting hole (6) of the peripheral symmetric position of contrast electrode (3), described contrast electrode (3), auxiliary electrode (5) fix through gelatin sponge (4) and PVC netted plastic plate; Said contrast electrode (3) is the Ag-AgCl electrode of solid, and said auxiliary electrode (5) is identical with the tested sample material; Contrast electrode (3) is a workplace with an end of auxiliary electrode (5), and the other end is welded with lead; Contrast electrode (3) adopts the epoxy encapsulation insulation with auxiliary electrode (5) other position except workplace.
The diameter dimension of said PVC netted plastic plate (2) is 50mm.
Said contrast electrode (3) is diameter 2mm, the solid Ag-AgCl electrode of long 40mm.
The diameter of said auxiliary electrode (5) is 2mm, and length is 40mm, and quantity is 24.
Said mounting hole (6) is 24.
Be used for the method for application of the Electrochemical Detection sensor of metal material surface defective, step is following:
(1) uses concentration to soak the chemical analysis test paper, be put in the middle of sensor and the tested sample, sensor is fixed on the tested sample as the NaCl solution of 1mol/L;
(2) gather impedance data: contrast electrode: Ag-AgCl electrode; Working electrode: tested sample; Auxiliary electrode material is identical with tested sample;
Acquisition noise data: contrast electrode: Ag-AgCl electrode; Working electrode 1: tested sample; Working electrode 2: identical with auxiliary electrode;
(3) compose to confirm the metal material surface defective through electrochemical impedance spectroscopy and noise time domain.
The invention has the beneficial effects as follows that sensor can change the use shape arbitrarily, thereby confirm the position of specimen surface defective through the galvanochemistry information of the sample diverse location that detects; Simple to operate, practical, survey overall process safety; Pollution-free, can obtain experimental result at short notice; The present invention makes simply, and cost is low, has a extensive future.
Description of drawings
Fig. 1 is the Electrochemical Detection sensor synoptic diagram of metal material surface defective;
Fig. 2 is that the A-A of Fig. 1 is to cut-open view;
Fig. 3 adopts the detected electrochemistry noise time domain spectrum that has the 45# carbon steel piston rod of surface imperfection of the present invention;
Fig. 4 adopts the detected electrochemical impedance spectroscopy that has the 45# carbon steel piston rod of surface imperfection of the present invention.
Description of reference numerals is following:
1---lead 2---PVC netted plastic plate
3---contrast electrode 4---gelatin sponge
5---auxiliary electrode 6---mounting hole
Embodiment
Through concrete embodiment the present invention is further described below.
As shown in Figure 1, the Electrochemical Detection sensor that is used for the metal material surface defective of the present invention comprises PVC netted plastic plate 2; It is the rounded material of the thick softness of 4～8mm; Diameter 50mm, it is provided with a plurality of mounting holes 6, and the quantity of mounting hole is confirmed according to the size of test specimen area to be detected.Be provided with contrast electrode 3 in the center mounting hole of PVC netted plastic plate 2, contrast electrode 3 (RE) is the Ag-AgCl electrode of solid, is that the employing diameter is 2mm; Long is the filamentary silver of 40mm, uses earlier acetone, cleans surperficial again with distilled water; With drying up after the absolute ethyl alcohol wiping; Its arbitrary end was immersed in the silver chloride of fusion 15 minutes, this end obtains solid Ag-AgCl contrast electrode as the workplace of contrast electrode again; Other end welding lead uses epoxy resin for the part packaging insulating except workplace again.Be provided with auxiliary electrode 5 in the mounting hole 6 of the peripheral symmetric position of contrast electrode 3, contrast electrode 3 fixes through gelatin sponge 4 and PVC netted plastic plate with auxiliary electrode 5; Auxiliary electrode 5 material therefors should be identical as far as possible with the tested sample material, because be difficult to accomplish identical material sometimes; Auxiliary electrode 5 also is that an end is a workplace, other end welding lead, and its workplace is used the 800# liquid honing, and requires level, and the epoxy encapsulation insulation is also adopted at other position except workplace.
Contrast electrode 3 all can be confirmed with the diameter and the length of auxiliary electrode 5 according to actual needs.
Specific embodiment adopts the piston rod of research electrode (WE) for using in the commercial production, 45# carbon steel.Piston rod surface has fraction that crackle is arranged, other part flawless.
Contrast electrode 3 (RE) is described like the front.Auxiliary electrode 5 (AF) is to use diameter to be 2mm, and length is the 45# carbon steel of 40mm, 24; One end welding lead is drawn, and other end cross section is reserved as workplace, and workplace is used the 800# liquid honing; Requirement level, the part outside the workplace adopt the epoxy encapsulation insulation.
With Ag-AgCl contrast electrode and 24 auxiliary electrodes with gelatin sponge be coated and fixed in the hole of PVC netted plastic (like Fig. 2).In order to guarantee that sensor is communicated with piston rod, the chemical analysis test paper that 1mol/L NaCl solution is soaked places in the middle of sensor and the tested sample, and sensor is fixed on the tested sample.Because PVC netted plastic plate 2 is a flexible material, so can adapt to the different shape on tested sample surface.
With the defective of sensor detection piston rod surface, Fig. 3 is the electrochemistry noise time domain spectrum that has the 45# carbon steel piston rod of surface imperfection, and Fig. 3 (a) is for there being the situation of crackle, and Fig. 3 (b) is flawless situation; Fig. 4 is the electrochemical impedance spectroscopy that has the 45# carbon steel piston rod of surface imperfection, also can find out, there have cracks and flawless place to have to be tangible different.
Claims (6)
1. Electrochemical Detection sensor that is used for the metal material surface defective; Comprise PVC netted plastic plate (2) and gelatin sponge (4); Described PVC netted plastic plate (2) is the rounded material of the thick softness of 4～8mm; It is provided with mounting hole (6); Be provided with contrast electrode (3) in the center mounting hole of PVC netted plastic plate (2), be provided with auxiliary electrode (5) in the mounting hole (6) of the peripheral symmetric position of contrast electrode (3), described contrast electrode (3), auxiliary electrode (5) fix through gelatin sponge (4) and PVC netted plastic plate; Said contrast electrode (3) is the Ag-AgCl electrode of solid, and said auxiliary electrode (5) is identical with the tested sample material; Contrast electrode (3) is a workplace with an end of auxiliary electrode (5), and the other end is welded with lead; Contrast electrode (3) adopts the epoxy encapsulation insulation with auxiliary electrode (5) other position except workplace.
2. according to the Electrochemical Detection sensor that is used for the metal material surface defective of claim 1, it is characterized in that the diameter dimension of said PVC netted plastic plate (2) is 50mm.
3. according to the Electrochemical Detection sensor that is used for the metal material surface defective of claim 1, it is characterized in that said contrast electrode (3) is diameter 2mm, the solid Ag-AgCl electrode of long 40mm.
4. according to the Electrochemical Detection sensor that is used for the metal material surface defective of claim 1, it is characterized in that the diameter of said auxiliary electrode (5) is 2mm, length is 40mm, and quantity is 24.
5. according to the Electrochemical Detection sensor that is used for the metal material surface defective of claim 1, it is characterized in that said mounting hole (6) is 24.
6. the method for application of the Electrochemical Detection sensor that is used for the metal material surface defective of claim 1, step is following:
(1) uses concentration to soak the chemical analysis test paper, be put in the middle of sensor and the tested sample, sensor is fixed on the tested sample as the NaCl solution of 1mol/L;
(2) gather impedance data: contrast electrode: Ag-AgCl electrode; Working electrode: tested sample; Auxiliary electrode material is identical with tested sample;
Acquisition noise data: contrast electrode: Ag-AgCl electrode; Working electrode 1: tested sample; Working electrode 2: identical with auxiliary electrode;
(3) compose to confirm the metal material surface defective through electrochemical impedance spectroscopy and noise time domain.
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| CN201210170195.5A CN102680543B (en) | 2012-05-28 | 2012-05-28 | Sensor for electrochemical detection on surface defects of metal material and use method of sensor |
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| CN102680543B CN102680543B (en) | 2014-02-26 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104567657A (en) * | 2014-12-23 | 2015-04-29 | 天津大学 | Method for representing metal surface corrosion roughness based on electrochemical impedance spectra |
| CN106053559A (en) * | 2016-07-30 | 2016-10-26 | 董超超 | System for detecting surface defects of metallic material |
| CN107389753A (en) * | 2015-02-25 | 2017-11-24 | 天津大学 | Cracks of metal surface detection method based on electrochemistry the cannot-harm-detection device |
| CN107576709A (en) * | 2015-02-25 | 2018-01-12 | 天津大学 | Metal welding jointses position galvanic corrosion sensitive detection method based on the cannot-harm-detection device |
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| CN2426151Y (en) * | 2000-04-25 | 2001-04-04 | 王佳 | Corrosion speed monitor probe |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2426151Y (en) * | 2000-04-25 | 2001-04-04 | 王佳 | Corrosion speed monitor probe |
Non-Patent Citations (3)
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| E. GARCÍA-OCHOA等: "Copper patina corrosion evaluation by means of fractal geometry using electrochemical noise (EN) and image analysis", 《ELECTROCHEMISTRY COMMUNICATIONS》 * |
| G. DU等: "Detection and characterization of stress-corrosion cracking on 304 stainless steel by electrochemical noise and acoustic emission techniques", 《CORROSION SCIENCE》 * |
| XIA DA-HAI等: "Corrosion behavior of tinplate in NaCl solution", 《TRANS. NONFERROUS MET. SOC. CHINA》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104567657A (en) * | 2014-12-23 | 2015-04-29 | 天津大学 | Method for representing metal surface corrosion roughness based on electrochemical impedance spectra |
| CN107389753A (en) * | 2015-02-25 | 2017-11-24 | 天津大学 | Cracks of metal surface detection method based on electrochemistry the cannot-harm-detection device |
| CN107576709A (en) * | 2015-02-25 | 2018-01-12 | 天津大学 | Metal welding jointses position galvanic corrosion sensitive detection method based on the cannot-harm-detection device |
| CN106053559A (en) * | 2016-07-30 | 2016-10-26 | 董超超 | System for detecting surface defects of metallic material |
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| CN102680543B (en) | 2014-02-26 |
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Effective date of registration: 20151027 Address after: 300192, 32 Nankai District Aerospace Road, Tianjin Patentee after: Tianjin Inst of Special Appliances Supervision and Check Tech Address before: 300072 Tianjin City, Nankai District Wei Jin Road No. 92 Patentee before: Tianjin University |
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Address after: No. 32 Space Road, Nankai District, Tianjin City, 300192 Patentee after: Tianjin Institute of Special Equipment Supervision and Inspection Technology (Tianjin Special Equipment Accident Emergency Investigation and Treatment Center) Address before: No. 32 Space Road, Nankai District, Tianjin City, 300192 Patentee before: Tianjin Inst of Special Appliances Supervision and Check Tech |
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