CN111272641A - Device and method for monitoring corrosion inside bolt hole - Google Patents
Device and method for monitoring corrosion inside bolt hole Download PDFInfo
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- CN111272641A CN111272641A CN202010162361.1A CN202010162361A CN111272641A CN 111272641 A CN111272641 A CN 111272641A CN 202010162361 A CN202010162361 A CN 202010162361A CN 111272641 A CN111272641 A CN 111272641A
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- 238000005260 corrosion Methods 0.000 title claims abstract description 99
- 230000007797 corrosion Effects 0.000 title claims abstract description 99
- 238000012544 monitoring process Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 8
- 239000002184 metal Substances 0.000 claims abstract description 124
- 229910052751 metal Inorganic materials 0.000 claims abstract description 124
- 239000011888 foil Substances 0.000 claims abstract description 115
- 238000003466 welding Methods 0.000 claims abstract description 10
- 238000012806 monitoring device Methods 0.000 claims abstract description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 239000011889 copper foil Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Pathology (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The invention provides a monitoring device and a monitoring method for monitoring corrosion inside a bolt hole. The monitoring device comprises a corrosion sensor and a micro-current meter, wherein the corrosion sensor is used for monitoring corrosion inside a bolt hole, the corrosion sensor comprises an anode area, a cathode area and a printed circuit board, the anode area comprises an anode conducting part and a plurality of anode metal foils, and the anode metal foils and the anode conducting part are integrally formed by welding; the cathode region comprises a cathode conductive part and a plurality of cathode metal foils, and the plurality of cathode metal foils and the cathode conductive part are integrally formed by welding; the anode metal foil and the cathode metal foil are fixed on the printed circuit board; the micro-current meter is respectively connected with the anode conductive part and the cathode conductive part of the corrosion sensor. The invention can monitor and evaluate the corrosion condition inside the bolt hole.
Description
Technical Field
The invention belongs to the technical field of metal corrosion monitoring, and relates to a device for monitoring corrosion inside a bolt hole.
Background
The metal material has different corrosion characteristics in different corrosive environments, so that the obtained environmental corrosivity can provide data support for the corrosion-resistant material selection design of major engineering, and the corrosion sensor is a sensor capable of monitoring the environmental corrosivity. Most of the existing corrosion sensors are based on the principle of galvanic corrosion, and mainly comprise anode metal and cathode metal which are composed of two metals with different activities, wherein both the anode metal and the cathode metal are welded with wires for electrically connecting with a current meter (such as a micro-current meter), and the magnitude of a current value displayed in the current meter can be used for reflecting the corrosivity of the environment.
In the prior art, the corrosion condition inside a bolt hole cannot be monitored due to the design, manufacturing process and application range of a sensor, and the service life of the bolt directly influences the safety service of equipment.
Disclosure of Invention
The invention aims to provide a device for monitoring corrosion inside a bolt hole.
Therefore, the invention adopts the following technical scheme: a device for monitoring corrosion inside a bolt hole comprises a corrosion sensor and a micro-current meter, wherein the corrosion sensor is used for monitoring corrosion inside the bolt hole and comprises an anode area, a cathode area and a printed circuit board, the anode area comprises an anode conductive part and a plurality of anode metal foils, and the anode metal foils and the anode conductive part are integrally formed through welding; the cathode region comprises a cathode conductive part and a plurality of cathode metal foils, and the plurality of cathode metal foils and the cathode conductive part are integrally formed by welding; the anode metal foil and the cathode metal foil are fixed on the printed circuit board; the micro-current meter is respectively connected with the anode conductive part and the cathode conductive part of the corrosion sensor.
The invention connects a plurality of anode metal foils and a plurality of cathode metal foils in parallel respectively. The micro-current meter is used for displaying the current value and the corresponding corrosion grade.
Furthermore, the number of the anode metal foils and the number of the cathode metal foils are not less than three, the anode metal foils are arranged at equal intervals, and the cathode metal foils are arranged at equal intervals.
Further, the distance between the adjacent anode metal foils is less than 3mm, and the distance between the adjacent cathode metal foils is less than 3 mm.
Further, after the anode metal foil is sprayed into the gap between two adjacent cathode metal foils, the distance between the adjacent anode metal foil and the adjacent cathode metal foil is less than 1 mm.
Further, the corrosion sensor is used for controlling the distance between the adjacent anode metal foil and cathode metal foil through a spraying process.
Further, the anode metal foil is tin, and the cathode metal foil is copper.
The invention also provides a monitoring method of the device for monitoring the corrosion in the bolt hole, which is characterized in that a corrosion sensor is placed in the bolt hole to be monitored; when the micro-current meter displays that the current range is 0-1 nA, the corresponding corrosion grade is C1, and the corrosion rate is 0-0.7 g/m2A; when the micro-current meter displays that the current range is 1-10 nA, the corresponding corrosion grade is C2, and the corrosion rate is 0.7-5 g/m2·a；When the micro-current meter displays that the current range is 10-30 nA, the corresponding corrosion grade is C3, and the corrosion rate is 5-15 g/m2A; when the micro-current meter displays that the current range is 30-60 nA, the corresponding corrosion grade is C4, and the corrosion rate is 15-30 g/m2A; when the micro-current meter displays that the current range is 60-112 nA, the corresponding corrosion grade is C5, and the corrosion rate is 30-60 g/m2A; when the micro-current meter displays that the current range is 112-353 nA, the corresponding corrosion grade is CX, and the corrosion rate is 60-180 g/m2·a。
The invention has the following beneficial effects:
according to the invention, the anode metal foil and the cathode metal foil both comprise a large amount of effective working areas, so that the thickness of the sensor is compressed, and therefore, the use space of the sensor is increased, and the monitoring requirement of corrosion inside the bolt hole is met under the condition of not changing the monitoring principle.
Drawings
FIG. 1 is a schematic diagram of a corrosion sensor according to the present invention;
FIG. 2 is a schematic view of the monitoring device of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides a device for monitoring corrosion in a bolt hole, which comprises a corrosion sensor and a micro-current meter, wherein the corrosion sensor is suitable for monitoring the corrosion in the bolt hole.
As shown in fig. 1, the corrosion sensor includes an anode region, a cathode region and a printed circuit board 3, the anode region includes an anode conductive portion 4 and a plurality of anode metal foils 1, the plurality of anode metal foils 1 and the anode conductive portion 4 are integrally formed by welding; the cathode region comprises a cathode conductive part 5 and a plurality of cathode metal foils 2, and the plurality of cathode metal foils 2 and the cathode conductive part 5 are integrally formed by welding; the anode metal foil 1 and the cathode metal foil 2 are fixed to a printed circuit board 3. The micro-current meter is respectively connected with the anode conductive part and the cathode conductive part of the corrosion sensor. Specifically, the anode conductive portion and the cathode conductive portion are both wires.
The number of the anode metal foils 1 and the number of the cathode metal foils 2 are not less than three, the anode metal foils 1 are arranged at equal intervals, and the cathode metal foils 2 are arranged at equal intervals.
The distance between the adjacent anode metal foils 1 is less than 3mm, and the distance between the adjacent cathode metal foils 2 is less than 3 mm.
After the anode metal foil 1 is sprayed into the gap between two adjacent cathode metal foils 2, the distance between the adjacent anode metal foil 1 and the adjacent cathode metal foil 2 is less than 1 mm.
The corrosion sensor is used to control the distance between adjacent anode metal foils 1 and cathode metal foils 2 by a spray coating process.
The anode metal foil 1 and the cathode metal foil 2 are matched, for example, the shape and the size of the two are the same, the number of the anode metal foils 1 is the same as that of the cathode metal foils 2, but the materials of the anode metal foils 1 and the cathode metal foils 2 are different, and the metal activity of the anode metal foils 1 is higher than that of the cathode metal foils 2. Specifically, in order to prolong the service life of the corrosion sensor and improve the accuracy of monitoring the corrosion grade of the corrosion sensor, the anode metal foil 1 and the cathode metal foil 2 are selected to satisfy both the stability and the metal activity, and accordingly, the anode metal foil 1 may use tin and the cathode metal foil 2 may use copper.
The anode metal foil 1 may be a sheet rectangle having a certain thickness, and the surface of the sheet anode metal foil 1 may be a working surface, that is, a surface showing a corrosion reaction in the environment. As shown in fig. 1, the anode conductive part 4 is located at a first end of the plurality of anode metal foils 1, and a distance between two adjacent anode metal foils 1 in the plurality of anode metal foils 1 is a first predetermined value. In this way, the anode conductive part 4 is integrally formed with the plurality of anode metal foils 1 by welding, and the welded part serves as a conductive anode, so that the plurality of anode metal foils 1 are connected in series, and the current value monitored by the corrosion sensor can accurately reflect the corrosiveness of the environment.
The cathode metal foil 2 may be a sheet-like rectangle having a certain thickness, and the surface of the sheet-like cathode metal foil 2 may serve as a working surface. As shown in fig. 1, the cathode conductive part 5 is located at the first end of the cathode metal foils 2, and a distance between two adjacent cathode metal foils 2 in the plurality of cathode metal foils 2 is a first predetermined value. In this way, the cathode conductive part 5 and the plurality of cathode metal foils 2 are integrally formed by welding, and the welded part serves as a conductive cathode, so that the plurality of cathode metal foils 2 are connected in series, and the current value monitored by the corrosion sensor can accurately reflect the corrosiveness of the environment.
The anode metal foils 1 and the cathode metal foils 2 are matched to form the corrosion sensor, specifically, the second end of each anode metal foil 1 is inserted between two adjacent cathode metal foils 2, the anode metal foil 1 is adjacent to but not in contact with the cathode conductive part 5, the second end of each cathode metal foil 2 is inserted between two adjacent anode metal foils 1, the second end of each cathode metal foil 2 is adjacent to but not in contact with the anode conductive part 4, and the distance between the adjacent anode metal foils 1 and the cathode metal foils 2 is a second preset value and is less than 1 mm.
Wherein the first predetermined value is equal to the sum of the width of the anode metal foil 1 and twice a second predetermined value, which reflects the corrosion.
As shown in fig. 2, in one possible application, the anode conductive part 4 and the cathode conductive part 5 of the corrosion sensor 12 may be connected to a micro-current meter 10 capable of displaying a current value through leads 9, respectively, the micro-current meter 10 is connected to the power supply 8 through the leads 9 to ensure a normal operation, and the corrosion sensor 12 is inserted into the bolt hole 11 through a hole 13 at the side of the bolt hole 11. Because the atmospheric environment, especially the humid atmospheric environment, has a high content of water vapor, and the atmospheric environment also has gases which promote the metal corrosion, the corrosion sensor is in the atmospheric environment for a long time, an atmospheric thin liquid film is formed between the adjacent anode metal foil 1 and the cathode metal foil 2, so that galvanic corrosion occurs between the adjacent anode metal foil 1 and the cathode metal foil 2, and a closed loop is formed between the corrosion sensor and the micro-current meter, so as to generate current, and the micro-current meter 10 can display the current value. Further, the micro-current meter 10 may further store a corresponding relationship between a current range and a corrosion level, such as the corresponding relationship shown in table 1, and the micro-current meter 10 may determine the corrosion level and the corrosion rate of the atmospheric environment based on the current range in which the current value is located. Of course, the technician can also look up the corrosion grade and the corrosion rate corresponding to the current value from table 1 according to the current value displayed by the micro-current meter.
TABLE 1 correspondence table of current and corrosion grade
| Grade of corrosion | Corrosion rate (g/m)2·a) | Current Range (nA) |
| C1 | 0-0.7 | 0-1 |
| C2 | 0.7-5 | 1-10 |
| C3 | 5-15 | 10-30 |
| C4 | 15-30 | 30-60 |
| C5 | 30-60 | 60-112 |
| CX | 60-180 | 112-353 |
In application, in order to improve the accuracy of the corrosion sensor in monitoring the corrosion level, the anode region may include a plurality of anode metal foils 1, and the cathode region 2 may include a plurality of cathode metal foils 2, for example, the corrosion sensor may include more anode metal foils 1 and more cathode metal foils 2, and the adjacent anode metal foils 1 and cathode metal foils 2 may form a set of monitoring electrodes, so that on one hand, the working area of the corrosion sensor may be increased, and the situation that a set of monitoring electrodes fails to cause inaccurate monitoring results may also be avoided.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. A device for monitoring corrosion inside a bolt hole comprises a corrosion sensor and a micro-current meter, wherein the corrosion sensor is used for monitoring the corrosion inside the bolt hole, and is characterized in that the corrosion sensor comprises an anode area, a cathode area and a printed circuit board (3), the anode area comprises an anode conductive part (4) and a plurality of anode metal foils (1), and the anode metal foils (1) and the anode conductive part (4) are integrally formed by welding; the cathode region comprises a cathode conductive part (5) and a plurality of cathode metal foils (2), and the plurality of cathode metal foils (2) and the cathode conductive part (5) are integrally formed by welding; the anode metal foil (1) and the cathode metal foil (2) are fixed on the printed circuit board (3); the micro-current meter is respectively connected with an anode conductive part (4) and a cathode conductive part (5) of the corrosion sensor.
2. The apparatus for monitoring corrosion inside a bolt hole according to claim 1, wherein: the number of the anode metal foils (1) and the number of the cathode metal foils (2) are not less than three, the anode metal foils (1) are arranged at equal intervals, and the cathode metal foils (2) are arranged at equal intervals.
3. The apparatus for monitoring corrosion inside a bolt hole according to claim 2, wherein: the distance between the adjacent anode metal foils (1) is less than 3mm, and the distance between the adjacent cathode metal foils (2) is less than 3 mm.
4. The apparatus for monitoring corrosion inside a bolt hole according to claim 1, wherein: after the anode metal foils (1) are sprayed into the gap between two adjacent cathode metal foils (2), the distance between the adjacent anode metal foils (1) and the adjacent cathode metal foils (2) is less than 1 mm.
5. The apparatus for monitoring corrosion inside a bolt hole according to claim 1, wherein: the corrosion sensor is used for controlling the distance between the adjacent anode metal foil (1) and cathode metal foil (2) through a spraying process.
6. The monitoring device for monitoring corrosion inside a bolt hole according to claim 1, wherein: the anode metal foil (1) is a tin foil, and the cathode metal foil (2) is a copper foil.
7. A method of monitoring using a monitoring device as claimed in any one of claims 1 to 6, characterised by placing a corrosion sensor in the interior of the bolt hole to be monitored; when the micro-current meter displays that the current range is 0-1 nA, the corresponding corrosion grade is C1, and the corrosion rate is 0-0.7 g/m2A; when the micro-current meter displays that the current range is 1-10 nA, the corresponding corrosion grade is C2, and the corrosion rate is 0.7-5 g/m2A; when the micro-current meter displays that the current range is 10-30 nA, the corresponding corrosion grade is C3, and the corrosion rate is 5-15 g/m2A; when the micro-current meter displays that the current range is 30-60 nA, the corresponding corrosion grade is C4, and the corrosion rate is 15-30 g/m2A; when the micro-current meter displays that the current range is 60-112 nA, the corresponding corrosion grade is C5, and the corrosion rate is 30-60 g/m2A; micro-currentWhen the meter shows that the current range is 112-353 nA, the corresponding corrosion grade is CX, and the corrosion rate is 60-180 g/m2·a。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010162361.1A CN111272641A (en) | 2020-03-10 | 2020-03-10 | Device and method for monitoring corrosion inside bolt hole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010162361.1A CN111272641A (en) | 2020-03-10 | 2020-03-10 | Device and method for monitoring corrosion inside bolt hole |
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| Publication Number | Publication Date |
|---|---|
| CN111272641A true CN111272641A (en) | 2020-06-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010162361.1A Pending CN111272641A (en) | 2020-03-10 | 2020-03-10 | Device and method for monitoring corrosion inside bolt hole |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050274628A1 (en) * | 2004-04-09 | 2005-12-15 | Lietai Yang | Method for measuring localized corrosion rate with a multi-electrode array sensor |
| WO2010078548A1 (en) * | 2009-01-02 | 2010-07-08 | E. I. Du Pont De Nemours And Company | Corrosion resistance evaluator |
| JP2015072250A (en) * | 2013-09-06 | 2015-04-16 | 国立大学法人九州大学 | Corrosion sensor and method of manufacturing the same |
| CN105973794A (en) * | 2016-05-30 | 2016-09-28 | 中国科学院金属研究所 | Atmospheric corrosivity monitoring equipment |
| CN109001104A (en) * | 2018-06-21 | 2018-12-14 | 浙江钱浪智能信息科技有限公司 | A kind of local environment erosion analysis method based on high-throughput device electricity |
| CN110411937A (en) * | 2019-07-03 | 2019-11-05 | 北京科技大学 | A kind of corrosion monitoring system monitoring corrosiveness of the environment and material corrosion rate |
-
2020
- 2020-03-10 CN CN202010162361.1A patent/CN111272641A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050274628A1 (en) * | 2004-04-09 | 2005-12-15 | Lietai Yang | Method for measuring localized corrosion rate with a multi-electrode array sensor |
| WO2010078548A1 (en) * | 2009-01-02 | 2010-07-08 | E. I. Du Pont De Nemours And Company | Corrosion resistance evaluator |
| JP2015072250A (en) * | 2013-09-06 | 2015-04-16 | 国立大学法人九州大学 | Corrosion sensor and method of manufacturing the same |
| CN105973794A (en) * | 2016-05-30 | 2016-09-28 | 中国科学院金属研究所 | Atmospheric corrosivity monitoring equipment |
| CN109001104A (en) * | 2018-06-21 | 2018-12-14 | 浙江钱浪智能信息科技有限公司 | A kind of local environment erosion analysis method based on high-throughput device electricity |
| CN110411937A (en) * | 2019-07-03 | 2019-11-05 | 北京科技大学 | A kind of corrosion monitoring system monitoring corrosiveness of the environment and material corrosion rate |
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Application publication date: 20200612 |
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