CN108562535B - Corrosion electrochemical nondestructive detection device and detection method for detecting metal surface defects - Google Patents
Corrosion electrochemical nondestructive detection device and detection method for detecting metal surface defects Download PDFInfo
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- 239000002184 metal Substances 0.000 title claims abstract description 35
- 230000007547 defect Effects 0.000 title claims abstract description 29
- 230000007797 corrosion Effects 0.000 title claims abstract description 16
- 238000005260 corrosion Methods 0.000 title claims abstract description 16
- 238000001514 detection method Methods 0.000 title description 23
- 239000000523 sample Substances 0.000 claims abstract description 104
- 230000007246 mechanism Effects 0.000 claims abstract description 22
- 238000009659 non-destructive testing Methods 0.000 claims abstract description 12
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 20
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 13
- 239000010962 carbon steel Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 13
- 239000012528 membrane Substances 0.000 claims description 11
- 239000011780 sodium chloride Substances 0.000 claims description 10
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 9
- 229920001568 phenolic resin Polymers 0.000 claims description 9
- 239000005011 phenolic resin Substances 0.000 claims description 9
- 238000002848 electrochemical method Methods 0.000 claims description 7
- ZOMNIUBKTOKEHS-UHFFFAOYSA-L dimercury dichloride Chemical class Cl[Hg][Hg]Cl ZOMNIUBKTOKEHS-UHFFFAOYSA-L 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 claims description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 2
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 2
- 241001330002 Bambuseae Species 0.000 claims description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 2
- 239000011425 bamboo Substances 0.000 claims description 2
- 238000004891 communication Methods 0.000 claims description 2
- 239000002023 wood Substances 0.000 claims description 2
- 238000003780 insertion Methods 0.000 claims 1
- 230000037431 insertion Effects 0.000 claims 1
- 238000012360 testing method Methods 0.000 abstract description 8
- 238000005259 measurement Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013399 early diagnosis Methods 0.000 description 1
- 238000000835 electrochemical detection Methods 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- 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 application discloses a corrosion electrochemical nondestructive testing device and a testing method for detecting metal surface defects, comprising a sample box, wherein driving clamping mechanisms for clamping samples to be tested are arranged at the left side and the right side in the sample box, a fixing frame is arranged at the outer side of the sample box, a first fixing rod and a second fixing rod which are rotationally connected with the fixing frame are arranged on the fixing frame, a first positioning clamp for clamping a multichannel electrode probe is fixedly arranged at the tail end of the first fixing rod, and a second positioning clamp for clamping a reference electrode is fixedly arranged at the tail end of the second fixing rod.
Description
Technical Field
The application relates to the technical field of nondestructive testing, in particular to a corrosion electrochemical nondestructive testing device and a testing method for testing metal surface defects.
Background
Nondestructive testing is now a well-established technique that consists essentially of (1) Permeation Testing (PT); (2) eddy current testing (ET); (3) ultrasonic detection (UT); (4) radiation detection (RT); (5) magnetic memory detection. Each detection means has its own advantages and disadvantages. For example, ultrasonic phased array detection: the scanning speed is high, the accuracy is high, the omnibearing scanning can be carried out, the method is suitable for measuring internal defects and surface defects with certain depth, not only the positions of the defects can be measured, but also the shapes and the sizes of the defects can be measured. However, the method is easily influenced by subjective and objective factors, and the working surface is required to be smooth; magnetic memory detection: both surface and internal defects are detectable. The metal surface of the detection part does not need to be cleaned and pretreated, has higher detection sensitivity and better repeatability than an ultrasonic method, and can detect a tiny defect stress concentration area, so that the metal surface detection device has higher sensitivity and reliability for early diagnosis of metal damage and removal and prevention of faults. But only magnetic material can be detected. Moreover, the detection means are all purely physical means.
The corrosion electrochemical testing method obtains potential distribution to detect the metal surface defects, does not need to treat the surface to be tested, is simple to operate, and is an effective method for carrying out corrosion electrochemical detection by utilizing the multichannel electrode probe, wherein the multichannel electrode probe is required to be closely attached to the surface of a sample, and the multichannel electrode probe and the sample to be tested cannot move relatively in the testing process so as to ensure the reliability of the detection result.
Disclosure of Invention
The application aims at solving the technical defects existing in the prior art, and provides a corrosion electrochemical nondestructive testing device and a detection method for detecting metal surface defects, which can adapt to samples with various sizes and can effectively position the samples.
The technical scheme adopted for realizing the purpose of the application is as follows:
the corrosion electrochemical nondestructive testing device for detecting the metal surface defects comprises a sample box, wherein a strip-shaped opening for a wire to penetrate is formed in the bottom end of the sample box, driving clamping mechanisms for clamping a sample to be tested are arranged on the left side and the right side in the sample box, each driving clamping mechanism comprises a positioning rod fixedly arranged on the inner wall of the sample box, an outer sleeve in sliding connection with the positioning rod and a positioning plate fixedly arranged at the end part of the outer sleeve, a cavity for the positioning rod to be inserted is formed in the outer sleeve, and a spring is arranged in the cavity;
the outside of sample box be equipped with the mount, be equipped with first dead lever and the second dead lever rather than rotating to be connected on the mount, the terminal fixed first locating clip that is used for holding multichannel electrode probe that is equipped with of first dead lever, the terminal fixed second locating clip that is used for holding the reference electrode that is equipped with of second dead lever, multichannel electrode probe, the bottom of reference electrode with the ion conductive membrane in the sample top that awaits measuring in close contact with, multichannel electrode probe, reference electrode and the sample that awaits measuring link to each other with electrochemical measuring device's work end, demarcation reference electrode end and earthing terminal through the wire respectively, electrochemical measuring device is connected with the computer communication.
In the technical scheme, the bottom end of the fixing frame is provided with the lifting mechanism, and the heights of the electrode probe and the bottom surface of the reference electrode can be adjusted.
In the technical scheme, the lifting mechanism adopts a hydraulic cylinder
In the above technical scheme, the reference electrode is a saturated calomel electrode.
In the technical scheme, the metal electrode rod in the multichannel electrode probe is made of Q235 type carbon steel, wherein the multichannel electrode probe is fixed in phenolic resin by 9-64Q 235 type carbon steel rods at equal intervals to form 3-8 rows and 3-8 columns.
In the technical scheme, the diameter of the metal electrode rod is 0.1mm-0.2mm.
In the technical scheme, the interval between the metal electrode bars is 4-6mm.
In the above technical solution, the ion-conductive membrane is a sponge, wood, filter paper or bamboo soaked in 3.5% NaCl solution.
In another aspect of the application, a method for detecting defects in a metal surface by corrosion electrochemical non-destructive testing comprises the steps of:
step 1: placing a sample to be tested between two positioning plates, and driving a clamping mechanism to fix the sample to be tested;
step 2: placing filter paper immersed with 3.5% NaCl solution as an ion conductive membrane at the top end of a sample to be detected;
step 3: rotating the first positioning clamp and the second positioning clamp to enable the multichannel electrode probe and the reference electrode to be in close contact with the ion conductive film, and inserting a grounding end wire of the electrochemical measurement device into the bottom end of the sample to be measured through the strip-shaped opening and making close contact with the bottom end of the sample to be measured;
step 4: analyzing and processing the collected potential signals and outputting a potential distribution map. The tested part of the electrode can be determined through the coordinates of the potential distribution map, and then the defect area of the surface of the sample is determined.
Compared with the prior art, the application has the beneficial effects that:
1. when a sample to be tested is tested, the reference electrode, the multichannel electrode probe and the sample to be tested are positioned by the corresponding fixing mechanisms, the positions of the reference electrode, the multichannel electrode probe and the sample to be tested are not deviated, the multichannel electrode probe and the sample to be tested are not moved relatively, the measuring points are determined, and the reliability of the measuring result can be effectively improved.
2. The setting of drive clamping mechanism in the sample box for this device is applicable to the sample of different width, and the elevating system's of mount bottom setting makes this device applicable to the sample of different thickness, has expanded the application scope of this device greatly.
3. Compared with the traditional method for nondestructively detecting the metal surface defects, the method is an electrochemical method, can be more visual and clear, is simple to operate, has high measurement precision and accuracy, and is not limited by the surface shape.
Drawings
Fig. 1 is a schematic structural view of embodiment 1 of the present application.
Fig. 2 is a schematic diagram showing the structure of the measurement state of embodiment 1 of the present application.
Fig. 3 is a front view of embodiment 1 of the present application.
Fig. 4 is a schematic structural diagram of embodiment 2.
Detailed Description
The application is described in further detail below with reference to the drawings and the specific examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
Example 1
As shown in fig. 1-3, a corrosion electrochemical nondestructive testing device for detecting metal surface defects comprises a sample box 1, wherein a strip-shaped opening 18 for a lead to penetrate is formed in the bottom end of the sample box 1, driving clamping mechanisms for clamping a sample 6 to be tested are arranged on the left side and the right side in the sample box 1, each driving clamping mechanism comprises a positioning rod 2 fixedly arranged on the inner wall of the sample box 1, an outer sleeve 3 in sliding connection with the positioning rod 2, and a positioning plate 5 fixedly arranged at the end part of the outer sleeve 3, a cavity for inserting the positioning rod 2 is formed in the outer sleeve 3, and a spring 4 is arranged in the cavity;
the outside of sample box 1 be equipped with mount 10, be equipped with on the mount 10 rather than rotating first dead lever 9 and the second dead lever 13 of being connected, the end of first dead lever 9 is fixed to be equipped with and is used for holding multichannel electrode probe 7's first locating clip 8, the end of second dead lever 13 is fixed to be equipped with and is used for holding reference electrode 11's second locating clip 12, multichannel electrode probe 7, reference electrode 11 and sample 6 to be measured link to each other with the working end, demarcating reference electrode end and the earthing terminal of electrochemical measuring device 14 through the wire respectively, electrochemical measuring device 14 communicates with computer 15 and is connected.
The setting of drive clamping mechanism can be applicable to the sample 6 that awaits measuring of different width, and the setting of first locating clip 8, second locating clip 12 avoids handheld multichannel electrode probe 7, reference electrode 11 in the measurement process for whole testing process labour saving and time saving more, convenient and fast.
The sample 6 to be measured is fixed in the sample box 1, and can not easily shift in the measuring process, so that the accuracy of measuring points is effectively improved, and the measuring reliability is high.
In this example, a saturated calomel electrode was used as the reference electrode, and a filter paper impregnated with 3.5% NaCl solution was used as the ion-conducting membrane 16. The metal electrode rod of the multichannel electrode probe is made of Q235 type carbon steel, wherein the multichannel electrode is formed by fixing 16Q 235 type carbon steel rods in phenolic resin at equal intervals, 4 rows and 4 columns are arranged in the phenolic resin at equal intervals, 6mm is arranged in the phenolic resin, and the diameter of the Q235 type carbon steel rods is 0.2mm. The signal acquisition end of the electrochemical measuring device comprises 16 signal acquisition joints, and the specific connection mode of the top end of the multichannel electrode probe 7 and the signal acquisition end of the electrochemical measuring device is as follows: the 16 metal electrode rods of the multichannel electrode probe are respectively connected with 16 signal acquisition joints at the working end of the electrochemical measuring device through 16 wires. In this embodiment, the electrochemical measurement device is controlled by a single chip microcomputer embedded therein, and potential signals of 16 signal acquisition points are sequentially acquired in sequence according to the positions of 16 metal electrode rods.
A detection method for detecting corrosion electrochemical nondestructive detection of metal surface defects comprises the following steps:
step 1: placing the sample 6 to be tested between the two positioning plates 5, and driving the clamping mechanism to fix the sample 6 to be tested;
step 2: placing filter paper immersed with 3.5% NaCl solution as an ion conductive membrane at the top end of a sample 6 to be detected;
step 3: rotating the first positioning clamp 8 and the second positioning clamp 12 to enable the multichannel electrode probe 7 and the reference electrode 11 to be in close contact with the ion conductive membrane 16, and inserting a grounding end lead of the electrochemical measurement device 14 into the bottom end of the sample 6 to be measured through the strip-shaped opening 18 to be in close contact with the bottom end;
step 4: analyzing and processing the collected potential signals and outputting a potential distribution map. The tested part of the electrode can be determined through the coordinates of the potential distribution map, and then the defect area of the surface of the sample is determined.
Example 2
As shown in fig. 4, this embodiment is improved on the basis of embodiment 1, the bottom end of the fixing frame 10 is provided with a lifting mechanism 17, and the heights of the electrode probe 7 and the bottom surface of the reference electrode 11 can be adjusted to adapt to the samples 6 to be measured with different heights, so that the mechanism can measure multiple samples with different widths and different heights, and the application range is wider.
Preferably, the lifting mechanism 17 adopts a hydraulic cylinder, so that the height of the fixing frame 10 can be adjusted more conveniently and rapidly.
In this example, a saturated calomel electrode was used as the reference electrode, and a filter paper impregnated with 3.5% NaCl solution was used as the ion-conducting membrane 16. The metal electrode rod of the multichannel electrode probe is made of Q235 type carbon steel, wherein 36Q 235 type carbon steel rods are fixed in phenolic resin at equal intervals to form 6 rows and 6 columns, the multichannel electrode is arranged in the phenolic resin at equal intervals by 5mm, and the diameter of the Q235 type carbon steel rods is 0.15mm. The signal acquisition end of the electrochemical measuring device comprises 36 signal acquisition joints, and the specific connection mode of the top end of the multichannel electrode probe 7 and the signal acquisition end of the electrochemical measuring device is as follows: the 36 metal electrode rods of the multichannel electrode probe are respectively connected with 36 signal acquisition joints at the working end of the electrochemical measuring device through 36 wires. In this embodiment, the electrochemical measurement device is controlled by a single chip microcomputer embedded therein, and potential signals of 36 signal acquisition points are sequentially acquired in sequence according to positions of 36 metal electrode rods.
A detection method for detecting corrosion electrochemical nondestructive detection of metal surface defects comprises the following steps:
step 1: placing the sample 6 to be tested between the two positioning plates 5, and driving the clamping mechanism to fix the sample 6 to be tested;
step 2: placing filter paper immersed with 3.5% NaCl solution as an ion conductive membrane at the top end of a sample 6 to be detected;
step 3: the height of the fixing frame 10 is adjusted, the first locating clamp 8 and the second locating clamp 12 are rotated to enable the multichannel electrode probe 7 and the reference electrode 11 to be in close contact with the ion conductive film 16, and a grounding end lead of the electrochemical measuring device 14 is inserted into the bottom end of the sample 6 to be measured through the strip-shaped opening 18 and is in close contact with the bottom end of the sample;
step 4: analyzing and processing the collected potential signals and outputting a potential distribution map. The tested part of the electrode can be determined through the coordinates of the potential distribution map, and then the defect area of the surface of the sample is determined.
Example 3
The detection device used in this example was the same as that used in example 1, in this example, a saturated calomel electrode was used as the reference electrode, and a filter paper immersed in 3.5% NaCl solution was used as the ion conductive membrane 16. The metal electrode rod of the multichannel electrode probe is made of Q235 type carbon steel, wherein the multichannel electrode is formed by fixing 64Q 235 type carbon steel rods in phenolic resin at equal intervals, 8 rows and 8 columns are formed, the multichannel electrode is arranged in the phenolic resin at equal intervals by 5mm, and the diameter of the Q235 type carbon steel rods is 0.2mm. The signal acquisition end of the electrochemical measuring device comprises 64 signal acquisition joints, and the specific connection mode of the top end of the multichannel electrode probe 7 and the signal acquisition end of the electrochemical measuring device is as follows: the 64 metal electrode bars of the multichannel electrode probe are respectively connected with 64 signal acquisition joints at the working end of the electrochemical measuring device through 64 wires. In this embodiment, the electrochemical measurement device is controlled by a single chip microcomputer embedded therein, and potential signals of 64 signal acquisition points are sequentially acquired in sequence according to the positions of 64 metal electrode rods.
A detection method for detecting corrosion electrochemical nondestructive detection of metal surface defects comprises the following steps:
step 1: placing the sample 6 to be tested between the two positioning plates 5, and driving the clamping mechanism to fix the sample 6 to be tested;
step 2: placing filter paper immersed with 3.5% NaCl solution as an ion conductive membrane at the top end of a sample 6 to be detected;
step 3: the height of the fixing frame 10 is adjusted, the first locating clamp 8 and the second locating clamp 12 are rotated to enable the multichannel electrode probe 7 and the reference electrode 11 to be in close contact with the ion conductive film 16, and a grounding end lead of the electrochemical measuring device 14 is inserted into the bottom end of the sample 6 to be measured through the strip-shaped opening 18 and is in close contact with the bottom end of the sample;
step 4: analyzing and processing the collected potential signals and outputting a potential distribution map. The tested part of the electrode can be determined through the coordinates of the potential distribution map, and then the defect area of the surface of the sample is determined.
The foregoing is merely a preferred embodiment of the present application and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present application, which are intended to be comprehended within the scope of the present application.
Claims (4)
1. The corrosion electrochemical nondestructive testing device for detecting the defects of the metal surface is characterized by comprising a sample box, wherein a strip-shaped opening for a lead to penetrate is formed in the bottom end of the sample box, driving clamping mechanisms for clamping a sample to be tested are arranged on the left side and the right side in the sample box, each driving clamping mechanism comprises a positioning rod fixedly arranged on the inner wall of the sample box, an outer sleeve in sliding connection with the positioning rod and a positioning plate fixedly arranged at the end part of the outer sleeve, a cavity for the insertion of the positioning rod is formed in the outer sleeve, and a spring is arranged in the cavity;
the outside of the sample box is provided with a fixing frame, a first fixing rod and a second fixing rod which are rotationally connected with the fixing frame are arranged on the fixing frame, a first positioning clamp used for clamping a multichannel electrode probe is fixedly arranged at the tail end of the first fixing rod, a second positioning clamp used for clamping a reference electrode is fixedly arranged at the tail end of the second fixing rod, the bottom ends of the multichannel electrode probe and the reference electrode are in close contact with an ion conductive film at the top end of a sample to be tested, the multichannel electrode probe, the reference electrode and the sample to be tested are respectively connected with the working end, the calibration reference electrode end and the grounding end of an electrochemical measuring device through wires, and the electrochemical measuring device is in communication connection with a computer;
the bottom end of the fixing frame is provided with a lifting mechanism, and the heights of the electrode probe and the bottom surface of the reference electrode can be adjusted;
the metal electrode rod in the multichannel electrode probe is made of Q235 type carbon steel;
the multichannel electrode probe is fixed in phenolic resin at equal intervals by 9-64Q 235 type carbon steel bars to form 3-8 rows and 3-8 columns;
the diameter of the metal electrode rod is 0.1mm-0.2mm; the interval between the metal electrode bars is 4-6mm;
the ion conductive film is a sponge, wood, filter paper or bamboo soaked in 3.5% NaCl solution.
2. A corrosion electrochemical nondestructive testing apparatus for detecting metal surface defects according to claim 1, wherein said lifting mechanism employs a hydraulic cylinder.
3. A corrosion electrochemical nondestructive testing device for detecting metal surface defects according to claim 1, wherein the reference electrode is a saturated calomel electrode.
4. A method of detecting a metal surface defect in a corrosive electrochemical nondestructive testing apparatus according to claim 1, comprising the steps of:
step 1: placing a sample to be tested between two positioning plates, and driving a clamping mechanism to fix the sample to be tested;
step 2: placing filter paper immersed with 3.5% NaCl solution as an ion conductive membrane at the top end of a sample to be detected;
step 3: rotating the first positioning clamp and the second positioning clamp to enable the multichannel electrode probe and the reference electrode to be in close contact with the ion conductive film, and inserting a grounding end wire of the electrochemical measurement device into the bottom end of the sample to be measured through the strip-shaped opening and making close contact with the bottom end of the sample to be measured;
step 4: analyzing and processing the collected potential signals, outputting a potential distribution diagram, and determining the tested part of the electrode through the coordinates of the potential distribution diagram so as to determine the defect area of the surface of the sample.
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| CN109557107A (en) * | 2018-12-29 | 2019-04-02 | 南工大溧阳新材料研发中心有限公司 | A kind of method for detection fault detection of stainless steel/carbon composite material |
| CN109900630A (en) * | 2019-01-31 | 2019-06-18 | 中国科学院金属研究所 | It is a kind of to evaluate complicated metal pair to the test device and method of galvanic corrosion |
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