CN102680543B - 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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- CN102680543B CN102680543B CN201210170195.5A CN201210170195A CN102680543B CN 102680543 B CN102680543 B CN 102680543B CN 201210170195 A CN201210170195 A CN 201210170195A CN 102680543 B CN102680543 B CN 102680543B
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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 for detection of metal material surface defect, specifically, relate to the technical field of the detection method of surface imperfection.
Background technology
The common lossless detection method of metal material surface defect is mainly contained to magnetic and detect (MT), utilize the stray field at workpiece, defect place and the interaction of magnetic, utilized steel product surface and near surface flaw (as crackle, slag inclusion, hairline etc.) difference of magnetic permeability and iron and steel magnetic permeability, after magnetization will there is rugged change in the magnetic field at these material discontinuity places, forming section flux leakage place surface of the work has produced stray field, thereby attract magnetic to form magnetism powder accumulation---the magnetic trace of fault location, under suitable illumination condition, show defective locations and shape, the accumulation of these magnetics is observed and explained, just realized magnetic detection, infiltration detects (PT): utilize the capillarity of liquid, penetrating fluid is infiltrated to solid material surface flaws place.By developer, the penetrating fluid of infiltration is precipitate into again to the existence of surperficial display defect, just realized infiltration and detected.
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 applied physical principle the defect of material is detected, and ultrasound examination and ray detection all can work the mischief to human health in varying degrees, to environment.
Also someone passes through electrochemical test method now, and metal material surface defect is detected.Electrochemical detection method has advantages of that original position is harmless, to sample, can not damage, and handling safety, can not cause environmental pollution, therefore, electrochemical detection method and the equipment of development surface imperfection have very important practical significance.
Summary of the invention
The object of the invention is, fill up the blank that electrochemical test method detects for metal material surface defect, provide a kind of and utilize electrochemical impedance spectroscopy and noise Time Domain Spectrum to carry out Analysis deterrmination whether to have sensor of surface imperfection, new metal material surface defects detection and preparation method thereof.
The present invention is achieved by following technical solution.
A kind of Electrochemical Detection sensor for metal material surface defect, comprise PVC netted plastic plate (2) and gelatin sponge (4), described PVC netted plastic plate (2) is the soft rounded material that 4～8mm is thick, on it, be provided with mounting hole (6), in the center mounting hole of PVC netted plastic plate (2), be provided with contrast electrode (3), in the mounting hole (6) of the periphery symmetric position of contrast electrode (3), be provided with auxiliary electrode (5), described contrast electrode (3), auxiliary electrode (5) fix by gelatin sponge (4) and PVC netted plastic plate; The Ag-AgCl electrode that described contrast electrode (3) is solid, described auxiliary electrode (5) is identical with tested sample material; Contrast electrode (3) is workplace with one end of auxiliary electrode (5), and the other end is welded with wire; Other position except workplace adopts epoxy encapsulation insulation to contrast electrode (3) with auxiliary electrode (5).
The diameter dimension of described PVC netted plastic plate (2) is 50mm.
Described contrast electrode (3) is diameter 2mm, the solid Ag-AgCl electrode of long 40mm.
The diameter of described auxiliary electrode (5) is 2mm, and length is 40mm, and quantity is 24.
Described mounting hole (6) is 24.
The using method that is used for the Electrochemical Detection sensor of metal material surface defect, step is as follows:
(1) the NaCl solution that is 1mol/L by concentration soaks chemical analysis test paper, is put in the middle of sensor and tested sample, and sensor is fixed in tested sample;
(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) by electrochemical impedance spectroscopy and noise Time Domain Spectrum, determine metal material surface defect.
The invention has the beneficial effects as follows, sensor can change arbitrarily use shape, thereby by the Electrochemistry Information of the sample diverse location that detects, determines the position of specimen surface defect, simple to operate, practical, survey overall process safety, pollution-free, can obtain at short notice experimental result; The present invention makes simply, and cost is low, has a extensive future.
Accompanying drawing explanation
Fig. 1 is the Electrochemical Detection sensor schematic diagram of metal material surface defect;
Fig. 2 is that the A-A of Fig. 1 is to cut-open view;
Fig. 3 is the electrochemistry noise Time Domain Spectrum that adopts the 45# carbon steel piston rod that has surface imperfection that the present invention detects;
Fig. 4 is the electrochemical impedance spectroscopy that adopts the 45# carbon steel piston rod that has surface imperfection that the present invention detects.
Description of reference numerals is as follows:
1---wire 2---PVC netted plastic plate
3---contrast electrode 4---gelatin sponge
5---auxiliary electrode 6---mounting hole
Embodiment
Below by specific embodiment, the invention will be further described.
As shown in Figure 1, the Electrochemical Detection sensor for metal material surface defect of the present invention, comprises PVC netted plastic plate 2, it is the soft rounded material that 4～8mm is thick, diameter 50mm, is provided with a plurality of mounting holes 6 on it, the quantity of mounting hole is determined according to the size of detected test specimen area.In the center mounting hole of PVC netted plastic plate 2, be provided with contrast electrode 3, the Ag-AgCl electrode that contrast electrode 3 (RE) is solid, that employing diameter is 2mm, long is the filamentary silver of 40mm, first with acetone, clean, with distilled water, clean surface again, with drying up after absolute ethyl alcohol wiping, again its arbitrary end is immersed in the silver chloride of melting 15 minutes, this one end is as the workplace of contrast electrode, obtain solid Ag-AgCl contrast electrode, other end welding lead, then use epoxy resin for the part packaging insulating except workplace.In the mounting hole 6 of the periphery symmetric position of contrast electrode 3, be provided with auxiliary electrode 5, contrast electrode 3 fixes by gelatin sponge 4 and PVC netted plastic plate with auxiliary electrode 5; Auxiliary electrode 5 material therefors should be as far as possible identical with tested sample material, because be sometimes difficult to accomplish identical material; Auxiliary electrode 5 is also that one end is workplace, other end welding lead, and its workplace 800# liquid honing, and require level, other position except workplace also adopts epoxy encapsulation insulation.
Contrast electrode 3 all can be determined according to actual needs with diameter and the length of auxiliary electrode 5.
Specific embodiment adopts the piston rod of Electrode (WE) for using in commercial production, 45# carbon steel.Piston rod surface has fraction to have crackle, other parts flawless.
Contrast electrode 3 (RE) is as described above.Auxiliary electrode 5 (AF) is to be 2mm with diameter, and length is the 45# carbon steel of 40mm, 24, one end welding lead is drawn, and other end cross section reserves as workplace, workplace 800# liquid honing, requirement level, the part outside workplace adopts epoxy encapsulation insulation.
By Ag-AgCl contrast electrode and 24 auxiliary electrodes with gelatin sponge be coated and fixed in the hole of PVC netted plastic (as 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 is placed in the middle of sensor and tested sample, and sensor is fixed in tested sample.Because PVC netted plastic plate 2 is flexible material, so can adapt to the various shapes on tested sample surface.
The defect of surveying piston rod surface with sensor, 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, has cracks and flawless place to have obvious difference.
Claims (6)
1. the Electrochemical Detection sensor for metal material surface defect, comprise PVC netted plastic plate (2) and gelatin sponge (4), it is characterized in that, described PVC netted plastic plate (2) is the soft rounded material that 4～8mm is thick, on it, be provided with mounting hole (6), in the center mounting hole of PVC netted plastic plate (2), be provided with contrast electrode (3), in the mounting hole (6) of the periphery symmetric position of contrast electrode (3), be provided with auxiliary electrode (5), described contrast electrode (3), auxiliary electrode (5) fixes by gelatin sponge (4) and PVC netted plastic plate, the Ag-AgCl electrode that described contrast electrode (3) is solid, described auxiliary electrode (5) is identical with tested sample material, contrast electrode (3) is workplace with one end of auxiliary electrode (5), and the other end is welded with wire, other position except workplace adopts epoxy encapsulation insulation to contrast electrode (3) with auxiliary electrode (5).
2. according to the Electrochemical Detection sensor for metal material surface defect of claim 1, it is characterized in that, the diameter dimension of described PVC netted plastic plate (2) is 50mm.
3. according to the Electrochemical Detection sensor for metal material surface defect of claim 1, it is characterized in that, described contrast electrode (3) is diameter 2mm, the solid Ag-AgCl electrode of long 40mm.
4. according to the Electrochemical Detection sensor for metal material surface defect of claim 1, it is characterized in that, the diameter of described auxiliary electrode (5) is 2mm, and length is 40mm, and quantity is 24.
5. according to the Electrochemical Detection sensor for metal material surface defect of claim 1, it is characterized in that, described mounting hole (6) is 24.
6. the using method of the Electrochemical Detection sensor for metal material surface defect of claim 1, is characterized in that, step is as follows:
(1) the NaCl solution that is 1mol/L by concentration soaks chemical analysis test paper, is put in the middle of sensor and tested sample, and sensor is fixed in tested sample;
(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) by electrochemical impedance spectroscopy and noise Time Domain Spectrum, determine metal material surface defect.
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| CN104567657A (en) * | 2014-12-23 | 2015-04-29 | 天津大学 | Method for representing metal surface corrosion roughness based on electrochemical impedance spectra |
| CN105319158B (en) * | 2015-02-25 | 2017-11-07 | 天津大学 | The cannot-harm-detection device and method of online prison detection metal welding jointses position galvanic corrosion sensitiveness |
| 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 |
| CN106053559A (en) * | 2016-07-30 | 2016-10-26 | 董超超 | System for detecting surface defects of metallic material |
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| CN2426151Y (en) * | 2000-04-25 | 2001-04-04 | 王佳 | Corrosion speed monitor probe |
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| CN2426151Y (en) * | 2000-04-25 | 2001-04-04 | 王佳 | Corrosion speed monitor probe |
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| 724页. * |
| Copper patina corrosion evaluation by means of fractal geometry using electrochemical noise (EN) and image analysis;E. García-Ochoa等;《Electrochemistry Communications》;20100409;第12卷(第6期);第826–830页 * |
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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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