CN113008776A - A galvanic couple corrosion test probe and corrosion detection system for annular gap - Google Patents
A galvanic couple corrosion test probe and corrosion detection system for annular gap Download PDFInfo
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- CN113008776A CN113008776A CN201911317825.5A CN201911317825A CN113008776A CN 113008776 A CN113008776 A CN 113008776A CN 201911317825 A CN201911317825 A CN 201911317825A CN 113008776 A CN113008776 A CN 113008776A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses a galvanic corrosion detection probe for an annular gap and a corrosion detection system. The galvanic corrosion detection probe includes a plurality of metal test pieces exposed on a surface of the galvanic corrosion detection probe at different potentials and isolated from each other. According to the galvanic corrosion detection probe of the present invention, corrosion detection of a microenvironment such as a bolt hole annular gap can be easily achieved.
Description
Technical Field
The invention relates to a gap corrosion detection technology, in particular to a galvanic corrosion detection probe for an annular gap and a corrosion detection system with the same.
Background
The environment corrosion detector and the atmosphere corrosion detector which are widely applied at present are mainly used for evaluating the corrosivity of the atmosphere environment, no equipment specially used for detecting the corrosivity of a microenvironment exists, and the corrosion problem in the microenvironment (particularly the microenvironment of an annular gap) is not noticed in the prior art. In addition, the size of the probe of the existing environmental corrosion detector and the size of the probe of the existing atmospheric corrosion detector are both centimeter-level, and the probes are large in size and cannot be directly applied to microenvironment corrosion detection.
Disclosure of Invention
It is an object of an embodiment of the present invention to provide a galvanic corrosion detection probe that can easily perform corrosion detection of a microenvironment such as a bolt hole annular gap.
In a first aspect, there is provided a galvanic corrosion detection probe for an annular gap, the galvanic corrosion detection probe being in an annular or arc-shaped cylindrical shape, the galvanic corrosion detection probe comprising a plurality of metal test pieces exposed to a surface of the galvanic corrosion detection probe at different potentials and isolated from each other.
Optionally, the metal test pieces include a first metal test piece and a second metal test piece which are different in electric potential and alternately arranged.
Optionally, the galvanic corrosion detection probe may further include: a first connection line connecting the plurality of first metal test pieces in series; and the second connecting line is used for connecting the second metal test pieces in series.
Optionally, the galvanic corrosion detection probe may further include: one end of the first cable is electrically connected to at least one first metal test piece, and the other end of the first cable is led out to the outside; and one end of the second cable is electrically connected to at least one second metal test piece, and the other end of the second cable is led out to the outside.
Alternatively, the material combination of the first metal test piece and the second metal test piece can be iron-copper, copper-zinc or iron-zinc.
Alternatively, a plurality of the metal test pieces may be ring-shaped, and are sequentially arranged on the upper surface and/or the lower surface of the galvanic corrosion detection probe from inside to outside or sequentially arranged on the side surface of the galvanic corrosion detection probe from top to bottom, or the plurality of the metal test pieces may be arc-shaped, and are sequentially arranged on the upper surface, the lower surface and/or the side surface of the galvanic corrosion detection probe end to end along the circumferential direction.
Alternatively, on the surface of the galvanic corrosion detection probe, the spacing between the metal test pieces which are different in electric potential and adjacent to each other may be in the range of 200 μm to 400 μm.
Optionally, the galvanic corrosion detection probe may further include a load-bearing wire connected to an upper portion of the galvanic corrosion detection probe for bearing a weight of the galvanic corrosion detection probe.
Optionally, the galvanic corrosion detection probe may further include a housing and an insulating material filled in the housing, wherein the insulating material supports and fills the plurality of metal test pieces.
Optionally, the housing may have an opening for exposing the plurality of metal coupons.
Optionally, the radial thickness of the galvanic corrosion detection probe may be greater than 1mm and less than 5mm, and is used for detecting corrosion of the annular gap of the bolt hole.
Optionally, the height of the galvanic corrosion detection probe may be 1cm to 3 cm.
In a second aspect, there is provided a corrosion detection system comprising a galvanic corrosion detection probe and a signal collector as described above.
The galvanic corrosion detection probe provided by the embodiment of the invention can be used for detecting the corrosion of a microenvironment, such as a bolt hole annular gap, and the recognition of the corrosion of the microenvironment is improved. In addition, the contact area between the metal test piece and the microenvironment air is increased, so that the accuracy of the obtained corrosion information can be obviously improved. The galvanic corrosion detection probe can be applied to a gap microenvironment with a deep depth, so that microenvironment corrosion information can be detected and analyzed from the spatial dimension. Because continuous real-time detection can be realized, the method can also be used for detecting and analyzing microenvironment corrosion information from a time dimension.
Drawings
FIG. 1 is a schematic diagram of an environment in which a galvanic corrosion detection probe according to an embodiment of the invention is used.
Fig. 2 is a sectional view a-a of fig. 1.
FIG. 3 is a schematic diagram of the arrangement and electrical connection of the metal test strips of the galvanic corrosion detection probe according to the embodiment of the present invention.
Description of reference numerals:
1: galvanic corrosion detection probe, 10: metal test piece, 11: first metal test piece, 12: second metal test piece, 13: housing, 14: insulating material, 15: first connection line, 16: second connecting line, 17: first cable, 18: second cable, 19: load line, 2: nut, 3: gasket, 4: bolt hole, 41: bolt hole inner wall, 5: bolt, 51: the bolt outer wall.
Detailed Description
In order that those skilled in the art will better understand the present invention, specific embodiments thereof will be described in detail below with reference to the accompanying drawings.
The term "microenvironment" as used herein refers to a space that is closed or semi-closed to the outside atmosphere and has poor air flow properties. In a microenvironment, once external water enters, the water stays for a long time, and can spontaneously condense under the condition of high relative humidity along with the change of day-night temperature difference. The 'microenvironment' has a difference with the temperature and humidity of the external atmospheric environment, and the corrosion information of the microenvironment cannot be directly represented by the corrosion information of the external atmospheric environment.
For example, in a microenvironment of a bolt hole annular gap, there may be a completely closed blind end due to the relatively closed bolt hole gap, plus the deep gap, poor air flow, and water accumulation. Also, when the temperature changes, condensation may occur in the gap below the dew point temperature, resulting in a more corrosive microenvironment than the open exterior environment.
Generally speaking, compared with the external atmospheric environment, the microenvironment such as the annular gap of the bolt hole is very easy to cause the corrosion problem of the metal workpiece because the internal air is difficult to form convection, and water is easy to accumulate or form condensed water.
In the prior art, there has been no study on micro-environmental corrosion detection such as bolt hole annular clearance, and the existing corrosion detection apparatus is also difficult to apply to micro-environmental corrosion detection due to configuration and size limitations.
According to the embodiment of the invention, the galvanic corrosion detection probe which can be applied to a microenvironment such as a bolt hole annular gap is provided, and the blank of the related technical field is filled.
Hereinafter, a galvanic corrosion detection probe 1 according to an embodiment of the present invention will be described in detail with reference to fig. 1 to 3.
The galvanic corrosion detecting probe 1 may have a ring-shaped cylindrical shape or an arc-shaped cylindrical shape, and the galvanic corrosion detecting probe 1 may include a first metal test piece 11 and a second metal test piece 12 exposed to the surface thereof in a spaced manner and having different potentials.
The height of the galvanic corrosion detection probe 1 can be 1 cm-3 cm. However, the present embodiment is not limited thereto, and may be adjusted according to the space to be detected, the actual detection depth requirement, and the like.
The radial thickness of the galvanic corrosion detection probe 1 can be in millimeter level to adapt to the size limit of the millimeter level annular gap.
For example, referring to fig. 1 and 2, an example of a galvanic corrosion detection probe 1 applied to a bolt hole annular gap is shown, wherein fig. 2 is a cross-sectional view taken along line a-a in fig. 1.
After the bolt 5 is fixed to the bolt hole 4 by the nut 2 and the washer 3, an annular gap is formed between the bolt 5 and the bolt hole inner wall 41, and the gap dimension S may be about 1mm to 5 mm.
In this case, the radial thickness of the galvanic corrosion detection probe 1 may be in the range of more than 1mm and less than 5mm, depending on the size of the annular gap in which corrosion detection is required.
The metal test pieces exposed on the surface of the probe 1 for detecting galvanic corrosion may include two or more metal test pieces with different potentials, and constitute one or more sets of pairs 10 for detecting galvanic corrosion.
The combination of materials of the two metal coupons comprising a set of galvanic corrosion test pairs 10 can be, for example, iron-copper, copper-zinc, iron-zinc, and the like.
When there are multiple sets of galvanic corrosion detection pairs 10, the same material combination may be applied to each galvanic corrosion detection pair 10, but embodiments of the present invention are not limited thereto. The individual galvanic corrosion test pairs 10 may also employ different combinations of materials, for example, one galvanic corrosion test pair 10 employs an iron-copper material combination and the other galvanic corrosion test pair 10 employs a copper-zinc material combination.
As an example, a plurality of galvanic corrosion detection pairs 10 may be located on different surfaces or in different areas of the galvanic corrosion detection probe 1, respectively, for detecting corrosive environments of different spatial extents.
The metal strips (e.g., the first metal strip 11 and the second metal strip 12) with different electric potentials can be alternately arranged and insulated from each other. That is, the metal test pieces with different electric potentials are not directly electrically connected, but after the galvanic corrosion detection probe 1 is placed in the microenvironment of the annular gap, the metal test pieces can be conducted when the surface of the metal test piece forms a liquid film due to moisture or deposits a certain amount of pollutants, so as to generate galvanic corrosion current.
The corrosion current can be analyzed in the range of 1nA to 10mA, and can be displayed on a precision digital display ammeter and directly reflect the corrosiveness in the microenvironment of the ring gap, for example, the magnitude of corrosiveness of the gas in the microenvironment.
The magnitude of the corrosion current is related to the dimension specification and arrangement of the metal test pieces, in addition to the thickness of the surface liquid film and the environmental characteristics.
The following will be described in detail with reference to the expression of the corrosion current I.
I＝(Φ1-Φ2)/R
Wherein Φ 1 is the potential of the first metal test piece, Φ 2 is the potential of the second metal test piece, and R is the resistance communicated between the two metal test pieces.
The resistance R in the expression is related to the space between the metal test pieces and the area of the metal test pieces.
The larger the spacing between the metal coupons, the smaller the current that can be detected under the same conditions. If the distance between the metal test pieces is too large, the impedance is increased, so that the output corrosion current is weakened, and even the corrosion current is difficult to measure, so that the calibration and measurement difficulty is increased, and the accuracy is reduced. If the distance between the metal test pieces is too small, a large corrosion current can be obtained, but there is a problem that short-circuiting is likely to occur.
Therefore, in the embodiment of the present invention, the distance between two metal test pieces with different electric potentials on the surface of the galvanic corrosion detecting probe 1 can be set to be in the range of 200 μm to 400 μm, so as to avoid short circuit and ensure the corrosion current intensity. For example, the spacing between the metal coupons can be 350 μm.
In addition, if the total area of the metal test pieces is larger, the corrosion signal (corrosion current) outputted under the same environmental conditions is also larger. Therefore, the number and the arrangement mode of the metal test pieces can be adjusted according to the current precision requirement required by the signal collector.
In the embodiment of the present invention, the number of the metal strips may be two or more, and the metal strips with different potentials are alternately arranged.
Referring to fig. 3, a schematic diagram of the arrangement and electrical connection of the metal test pieces is shown.
The galvanic corrosion detection probe 1 may include a plurality of first metal test pieces 11 and a plurality of second metal test pieces 12 to increase a contact area between the metal test pieces and air in the microenvironment, so as to ensure accuracy of collected microenvironment information.
The galvanic corrosion detection probe 1 may further include: a first connecting line 15 connecting the plurality of first metal test pieces 11 in series; and a second connection line 16 connecting the plurality of second metal test pieces 12 in series. The metal test pieces with the same electric potential are connected in series through the connecting wires, so that the detection area can be increased.
The arrangement of the connecting wire is not limited, and the connecting wire may be arranged on the surface of the galvanic corrosion detection probe 1, or may be embedded in the galvanic corrosion detection probe 1.
The galvanic corrosion detection probe 1 may further include: a first cable 17 electrically connecting the first metal test piece 11 to the outside; and a second cable 18 electrically connecting the second metal test piece 12 to the outside. Therefore, the metal test pieces with different electric potentials can be respectively and electrically connected to an external signal collector through the cables, so that the corrosion current is transmitted to the external signal collector when the corrosion current is generated between the metal test pieces. The signal collector may be, for example, a current collector at the nA level, and may directly display the detected corrosion current.
As an example, openings may be further formed at the side or top or bottom of the galvanic corrosion detection probe 1 for the first connection line 15, the second connection line 16, the first cable 17 and the second cable 18 to pass through.
Fig. 3 shows an example of arranging 4 metal test pieces alternately. However, the embodiment of the present invention is not limited thereto, and 3, 5 or more metal test pieces may be arranged.
Although not shown, the metal test strip may have a ring-shaped sheet shape or an arc-shaped sheet shape and be appropriately arranged according to the size of the sensing probe and the space of the application scenario. As an example, the plurality of metal test pieces may be annular, have different diameters, and are arranged on the surface of the probe 1 from inside to outside in a concentric manner, so as to enlarge the detection area and increase the corresponding area between the adjacent metal test pieces of the couple, thereby improving the detection sensitivity. As another example, the plurality of metal test pieces may be arc-shaped and have the same diameter, and the plurality of metal test pieces are sequentially arranged end to end along the circumferential direction on the surface of the galvanic corrosion detection probe 1, such an arrangement may improve the utilization rate of the surface space, thereby increasing the total area of the metal test pieces.
The metal test piece can be exposed on the side surface, the upper surface or the lower surface of the galvanic corrosion detection probe 1, and can be provided with one, two or more detection surfaces according to requirements.
Referring to fig. 1, the galvanic corrosion detecting probe 1 may further include a load-bearing wire 19, and the load-bearing wire 19 may be connected to an upper portion of the galvanic corrosion detecting probe 1, bear its weight, and be capable of lifting up or releasing the galvanic corrosion detecting probe down, so that the galvanic corrosion detecting probe 1 may be placed at a predetermined depth of the bolt hole gap according to the detection requirement. Thus, corrosion information of the microenvironment can be analyzed from the spatial dimension.
For example, for an annular gap of a pitch bearing bolt hole of a wind turbine, the galvanic corrosion detection probe 1 can be placed at a position of the pitch bearing bolt hole, which is about 2cm from the bottom or about 2cm from the top.
However, the embodiment is not limited to this, and for a narrow gap microenvironment, such as a blade root bolt annular gap microenvironment of a wind turbine blade, a plurality of galvanic corrosion detection probes 1 can be respectively placed at different depths, so as to realize full detection of the environment to be detected.
Referring to fig. 3, the galvanic corrosion detection probe 1 may further include a housing and an insulating material 14 filled in the housing.
The housing 13 may be an insulating housing that defines the exterior shape of the galvanic corrosion detection probe 1 and houses and supports the internal materials located therein. As an example, the housing 13 may be, for example, an integrally molded annular cylindrical housing, or a combination of two separable cylindrical housings.
The insulating material 14 may be, for example, epoxy resin or the like. The insulating material 14 may be filled in the housing 13 by, for example, casting, and then cured, thereby forming an inner matrix material of the galvanic corrosion detection probe 1.
During the process of pouring the filling insulating material 14, a metal coupon may be disposed on the insulating material 14 such that the metal coupon is embedded in the insulating material 14. After the insulating material 14 is cured, a prefabricated columnar forming body is formed, and the first metal test piece 11 and the second metal test piece 12 are exposed by grinding the corresponding surfaces.
In the finally formed galvanic corrosion detection probe 1, the outer shell 13 may surround and support the insulating material 14 as a housing. The insulating material 14 can be used as a base material to support the metal test pieces and fill the metal test pieces to insulate the metal test pieces from each other.
As an example, in the case where both the upper surface and the lower surface of the galvanic corrosion detecting probe 1 are ground to expose the metal test piece, the housing 13 has a cylindrical shape surrounding the side surface of the galvanic corrosion detecting probe 1. That is, both the upper side and the lower side of the housing 13 may have an opening, and the metal test strip may be disposed in the opening of the housing 13.
Before the galvanic corrosion detection probe 1 according to the present invention is used for detection, the probe needs to be calibrated.
The calibration method of the galvanic corrosion detection probe comprises the following steps: placing the galvanic corrosion detection probe and other mature corrosion detection instruments (such as a corrosion coupon, a corrosion probe and the like) in the same stable environment, and realizing the benchmarking of the galvanic corrosion detection probe and the corrosion variation of a standard corrosion coupon according to the principle that the corrosion characteristics of the stable environment do not change; and establishing the relationship between the galvanic corrosion detection probe and the environmental corrosion grade according to the relationship between the corrosion variation of the standard corrosion coupon in GB/T19292.2 and the environmental corrosion grade. Finally, the calibrated galvanic corrosion detection probe can realize the rapid evaluation and analysis of the environmental corrosion grade.
Although the galvanic corrosion detection probe 1 of the present invention is described in the specification and the drawings with the bolt hole annular gap as an example of the microenvironment, the present invention is not limited thereto. The closed or semi-closed, poorly mobile atmosphere formed in the mechanical structure falls within the category of microenvironment described herein.
In addition, the galvanic corrosion detection probe 1 according to the present invention is not limited to be used in an annular gap microenvironment, and may be used in any other shape microenvironment, atmospheric environment, or corrosion detection of a specific material.
For example, the galvanic corrosion detection probe 1 can be placed in a microenvironment and an atmospheric environment, respectively, so as to accurately analyze the difference in corrosivity between the microenvironment and the atmospheric environment.
According to the galvanic corrosion detection probe provided by the embodiment of the invention, compared with the corrosion detection equipment for detecting specific materials in the prior art, the specific information such as the application state of the specific materials does not need to be considered, so that the corrosion detection process can be simplified.
The galvanic corrosion detection probe according to the embodiment of the invention can realize continuous detection, so that the corrosion information of a microenvironment can be analyzed from a time dimension.
In summary, the galvanic corrosion detection probe according to the embodiment of the invention can easily realize micro-environment corrosion detection, especially ring gap micro-environment corrosion detection, so that the protection effect of corrosion protection measures (such as gas phase slow release agent and drying agent) of the micro-environment can be accurately known, or a data basis is provided for the micro-environment corrosion protection process.
According to the galvanic corrosion detection probe provided by the embodiment of the invention, as the galvanic corrosion detection probe has the annular or arc shape, the microenvironment space can be fully utilized, the contact area between the metal test piece and the microenvironment air is increased, and the corrosion information of the microenvironment of the annular gap can be accurately collected. In addition, the metal test piece can be positioned on a plurality of surfaces of the galvanic corrosion detection probe, so that the contact area of the metal test piece and microenvironment air can be increased, and the detection freedom degree is improved.
Although a few embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents, and that such changes and modifications are intended to be within the scope of the invention.
Claims (13)
1. A galvanic corrosion detection probe (1) for an annular gap is characterized in that the galvanic corrosion detection probe (1) is in an annular column shape or an arc column shape,
the galvanic corrosion detection probe (1) comprises a plurality of metal test pieces which are different in electric potential and exposed on the surface of the galvanic corrosion detection probe (1) in a mutually isolated manner.
2. The galvanic corrosion detection probe (1) according to claim 1, wherein the plurality of metal coupons comprises a first metal coupon and a second metal coupon (12) with different potentials and arranged alternately.
3. The galvanic corrosion detection probe (1) according to claim 2, characterized in that said galvanic corrosion detection probe (1) further comprises:
a first connecting line (15) for connecting the first metal test pieces (11) in series;
and a second connection line (16) for connecting the plurality of second metal test pieces (12) in series.
4. The galvanic corrosion detection probe (1) according to claim 3, characterized in that said galvanic corrosion detection probe (1) further comprises:
a first cable (15) having one end electrically connected to at least one of the first metal test pieces (11) and the other end led out to the outside;
and one end of the second cable (16) is electrically connected to at least one second metal test piece (12), and the other end of the second cable is led out to the outside.
5. The galvanic corrosion detection probe (1) according to claim 2, wherein the material combination of the first metal coupon (11) and the second metal coupon (12) is iron-copper, copper-zinc or iron-zinc.
6. The galvanic corrosion detection probe (1) according to claim 1,
the plurality of metal test pieces are annular and are sequentially arranged on the upper surface and/or the lower surface of the galvanic corrosion detection probe (1) from inside to outside or are sequentially arranged on the side surface of the galvanic corrosion detection probe (1) from top to bottom,
or the plurality of metal test pieces are arc-shaped and are sequentially arranged on the upper surface, the lower surface and/or the side surface of the galvanic corrosion detection probe (1) end to end along the circumferential direction.
7. Galvanic corrosion detection probe (1) according to any of claims 1 to 6, characterized in that on the surface of the galvanic corrosion detection probe (1) the spacing between the metal coupons of different potentials and adjacent to each other is in the range of 200 μm to 400 μm.
8. Galvanic corrosion detection probe (1) according to any of claims 1-6, characterized in that said galvanic corrosion detection probe (1) further comprises a load line (19), said load line (19) being connected to an upper portion of said galvanic corrosion detection probe (1) for carrying the weight of said galvanic corrosion detection probe (1).
9. Galvanic corrosion detection probe (1) according to any of claims 1-6, characterized in that said galvanic corrosion detection probe (1) further comprises a housing (13) and an insulating material (14) filled in said housing (13), said insulating material (14) supporting and filling a plurality of said metal coupons.
10. The galvanic corrosion detection probe (1) according to claim 9, wherein said housing (13) has an opening for exposing a plurality of said metal coupons.
11. Galvanic corrosion detection probe (1) according to any of claims 1-6, characterized in that the radial thickness of the galvanic corrosion detection probe (1) is larger than 1mm and smaller than 5mm for bolt hole annular gap corrosion detection.
12. The galvanic corrosion detection probe (1) according to claim 11, wherein the height of the galvanic corrosion detection probe (1) is 1cm to 3 cm.
13. A corrosion detection system comprising a galvanic corrosion detection probe (1) according to any one of claims 1-12 and a signal collector.
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