CN214503304U

CN214503304U - Corrosivity detection sensor

Info

Publication number: CN214503304U
Application number: CN202022206320.6U
Authority: CN
Inventors: 范益; 代芹芹; 蔡佳兴; 程学群; 马宏驰
Original assignee: Nanjing Iron and Steel Co Ltd
Current assignee: Nanjing Iron and Steel Co Ltd
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2021-10-26
Anticipated expiration: 2030-09-30

Abstract

The utility model discloses a corrosivity detection sensor, which comprises an electrode group and two leads, wherein the electrode group comprises a first electrode plate, an insulating layer and a second electrode plate which are sequentially stacked; one lead is connected with the first electrode plate, and the other lead is connected with the second electrode plate; the first electrode plate is provided with through working holes, the insulating layer is provided with through working holes, and the positions, the diameters and the number of the through working holes are the same. The utility model continuously monitors the corrosion data on line in real time; meanwhile, the testing device is simple to manufacture, small in size, capable of being applied to closed environments such as concrete and heat-insulating layers, which cannot be applied by traditional testing methods, low in requirement on the using environment and wide in application range.

Description

Corrosivity detection sensor

Technical Field

The utility model relates to a detection device especially relates to a corrosivity detects sensor.

Background

Environmental corrosivity is one of important factors influencing the service safety of materials, and the environmental corrosivity is influenced by factors such as temperature, humidity, chloride ions, sulfur dioxide and the like, so that the corrosivity difference of different areas is large. Monitoring of environmental corrosion is therefore very important.

The field coupon corrosion test is a traditional method for evaluating environmental corrosivity based on corrosion rate, but the method has long test period and cannot obtain real-time corrosion monitoring data. Although the traditional electrochemical method, such as alternating current impedance and the like, can realize the rapid acquisition of real-time corrosion monitoring data, the traditional electrochemical method cannot be used in micro environments such as a coating bottom layer, an insulating layer and concrete due to the characteristics of complex electrode system, large volume, large monitoring data fluctuation and the like.

Disclosure of Invention

The purpose of the invention is as follows: the utility model discloses it is not enough to aim at solving the above-mentioned of prior art, provides a corrosivity detection sensor, solves quick real-time detection environment corrosivity problem to and be filming microenvironment corrosivity detection problem such as bottom, heat preservation inside, concrete.

The technical scheme is as follows: the utility model discloses a corrosivity detection sensor, including electrode group and two wires, the electrode group includes first electrode piece, insulating layer and second electrode piece, and the three are stacked in proper order; the first wire is connected with the first electrode plate, and the second wire is connected with the second electrode plate; the first electrode plate is provided with a first penetrating working hole, the insulating layer is provided with a second penetrating working hole, and the positions, the diameters and the number of the first and second working holes are the same. The second electrode plate is a non-porous flat plate.

The difference between the potentials of the first electrode plate and the second electrode plate is more than 50mV, preferably more than 150 mV.

The first electrode plate is Zn, Al, Mg, Sn or carbon steel; the second electrode plate is made of Cu, Ni, Ti or stainless steel.

The thickness of the first electrode plate is 1-10mm, and the thickness of the second electrode plate is larger than 1 mm. The thickness of the first electrode plate is smaller than 1mm, so that the processing difficulty is increased, and the error of a test result is increased due to large error of the processing precision; a thickness exceeding 10mm increases the weight of the electrode and has little effect on the test results.

The electrode assembly is fixed by a fastener or an adhesive, so that the positions of the first electrode plate and the working hole of the insulating layer are fixed.

The conducting wires are copper conducting wires or silver conducting wires with low resistivity, the two conducting wires are connected with a high-precision current tester, and the measured potential difference is processed, converted and displayed.

The thickness of the insulating layer is 0.1mm-2mm, if the thickness is less than 0.1mm, the processing difficulty is increased, and the risk of short circuit of the first electrode plate and the second electrode plate is increased.

Has the advantages that: compared with the prior art, the utility model has the advantages that can online real-time continuous monitoring corrosion data. Simultaneously the utility model discloses make simple, small in size, can be applied to in the airtight environment that traditional test methods such as concrete, heat preservation can't be used, it is low to the environmental requirement of use, the range of application is wide.

Drawings

FIG. 1 is a block diagram of the present invention;

fig. 2 is that the utility model discloses record corrosion monitoring curve in the Qingdao atmospheric environment.

Detailed Description

The technical solution of the present invention will be further explained with reference to the accompanying drawings.

Example one

As can be seen from fig. 1, a corrosion detection sensor includes an electrode group composed of a first electrode sheet 1, a second electrode sheet 3, and an insulating layer 2, the first electrode sheet 1 being Zn, Al, Mg, Sn, or carbon steel; the second electrode plate 3 is made of Cu, Ni, Ti or stainless steel. And the second electrode plate 3 is a non-porous flat plate. The thickness of the first electrode plate 1 is 1-10mm, the processing difficulty is increased when the thickness is less than 1mm, and the error of a test result is increased due to large error of processing precision; a thickness exceeding 10mm increases the weight of the electrode and has little effect on the test results. The thickness of the second electrode plate 3 is not particularly required, and considering the installation strength, the thickness is more than 1 mm. The first electrode sheet 1 and the second electrode sheet 3 have a potential difference of 50mV or more, preferably 150mV or more. The low-resistivity first lead wire 4 is connected with the first electrode slice 1; and a second wire 7 with low resistivity connected with the second electrode plate 3. The wire is a copper wire or a silver wire.

The insulating layer 2 is an insulating sheet with the thickness of 0.1mm-2 mm. The insulating sheet material is PVC or other insulating polymer. If the thickness is less than 0.1mm, the processing difficulty is increased, and the risk of short circuit of the first electrode sheet 1 and the second electrode sheet 3 is increased.

The shape and area of the electrode plate have no special requirements. The first electrode sheet 1 and the second electrode sheet 3 may have the same area, or may be different in view of mounting convenience. The first electrode sheet 1 and the second electrode sheet 3 may also be standard electrodes, thereby reducing the cost of the electrodes. The first electrode plate 1, the second electrode plate 3 and the insulating layer 2 can be fixed through the willow nut or the screw; or may be fixed by adhesion.

A first working hole 5 penetrating through the first electrode plate 1 is drilled, a second working hole 6 penetrating through the insulating layer 2 is drilled, the positions, the diameters and the number of the working holes are completely consistent, and the diameter of each working hole is not smaller than 1 mm. The side surfaces of the first working hole 5 of the first electrode and the surfaces of the second electrode sheet exposed by the second working hole 6 of the insulating layer constitute working areas, and these surfaces are exposed to the air or liquid environment, so that the corrosivity of the air or liquid environment can be measured or evaluated. The position, the diameter and the number of the working holes can be designed according to the diameter of the electrode plate, so that the electrode testing precision is improved.

The electrode group except the working hole is completely sealed by curable resin or glue, which is beneficial to improving the stability and the test precision of the electrode sensor.

Example two

In the embodiment, a Zn wafer with the thickness of 2mm and the diameter of 40mm is selected as a first electrode plate 1, and an acrylic insulating layer 2 with the same size and the thickness of 0.1mm is placed on one surface of the Zn wafer; respectively drilling 5 penetrating working holes with the diameter of 5mm on the Zn wafer and the acrylic; taking a Cu wafer with the thickness of 1.5mm and the diameter of 40mm as a second electrode plate 3, stacking and compacting the Cu first electrode plate 3, a Zn electrode plate 1 drilled with a through working hole and an acrylic insulating layer 2; drilling 3 threaded holes of 3mm in the non-working hole region of the Cu and Zn electrode plates, and fixing the two electrode plates by using an M3 insulated nylon screw; and respectively connecting the Cu electrode plate and the Zn electrode plate with low-resistivity wires, then coating the part outside the working hole with waterproof paint, and obtaining the corrosivity detection sensor of the disc electrode after the waterproof paint is completely cured.

5 identical disk electrodes were made. Two leads of one of the disc electrodes are connected with a high-precision current tester and then exposed in the Qingdao atmospheric environment to obtain a corrosion monitoring curve as shown in figure 2, and the change of the environmental corrosivity is reflected through the curve trend, so that the change of the atmospheric corrosivity is continuously monitored in real time.

The other 4 disc electrodes were subjected to a periimmersion acceleration experiment (acceleration ratio 1: 50) in a sodium chloride solution simulating atmospheric corrosion in the marine environment, and the current of the disc electrodes was measured with a high-precision current tester. And (3) calculating the change rate of the current of the disc electrode changing with time compared with the initial current, and checking the stability and the service life of the disc electrode (the disc electrode is judged to be invalid when the current changes by 15% compared with the initial current). The results of the experiment are shown in table 1. The results show that the disc electrode has a lifetime of more than 6 years.

TABLE 1 disc electrode Current vs. time

Test time (d)	7	14	21	28	35	42	49
								Change in Current (%)	5.1	4.9	7.1	9.2	8.5	8.3	12.8

Connecting a lead of the disc electrode with a high-precision current tester, continuously monitoring the current value of the disc electrode through the high-precision current tester, and reflecting the change of environmental corrosivity through the change of the current value so as to realize the continuous monitoring of the environmental corrosivity; the manufacturing materials of the disc electrode are easy to obtain, the processing difficulty and complexity are low, the error in the processing process is small, and the consistency of the disc electrode is ensured; the disc electrode testing precision can be controlled by adjusting the thickness of the insulating sheet, the diameter of the working holes and the number of the working holes, so that different requirements for environment monitoring are met, the applicability of the disc electrode is improved, the stability of the disc electrode is improved, and the service life of the disc electrode is prolonged.

Claims

1. A corrosivity detection sensor comprises an electrode group and two leads, wherein the electrode group comprises a first electrode plate (1), an insulating layer (2) and a second electrode plate (3), and the first electrode plate, the insulating layer and the second electrode plate are sequentially stacked; the first wire (4) is connected with the first electrode plate (1), and the second wire (7) is connected with the second electrode plate (3); the method is characterized in that: the first electrode plate is provided with a first through working hole (5), the insulating layer is provided with a second through working hole (6), and the positions, the diameters and the number of the working holes are the same; the second electrode plate (3) is a non-porous flat plate.

2. A corrosion detection sensor according to claim 1, wherein: the potential difference between the first electrode plate (1) and the second electrode plate (3) is more than 50 mV.

3. A corrosion detection sensor according to claim 1, wherein: the first electrode plate (1) is Zn, Al, Mg, Sn or carbon steel.

4. A corrosion detection sensor according to claim 1, wherein: the second electrode plate (3) is made of Cu, Ni, Ti or stainless steel.

5. A corrosion detection sensor according to claim 1, wherein: the thickness of the first electrode plate (1) is 1-10mm, and the thickness of the second electrode plate is larger than 1 mm.

6. A corrosion detection sensor according to claim 1, wherein: the first electrode plate (1), the insulating layer (2) and the second electrode plate (3) are circular, square or triangular.

7. A corrosion detection sensor according to claim 1, wherein: the electrode assembly is secured using fasteners or adhesives.

8. A corrosion detection sensor according to claim 1, wherein: the wire is a copper wire or a silver wire.

9. A corrosion detection sensor according to claim 1, wherein: the thickness of the insulating layer (2) is 0.1mm-2 mm.