Corrosion sensor and application method thereof

Abstract

The invention discloses a corrosion sensor and an application method thereof, and belongs to the technical field of corrosion detection. The corrosion sensor comprises a power supply, a corrosion measuring element, a first wire, a giant magnetoresistance sensor, a magnetic ring, an operational amplifier, a second wire and a power amplifier, the power supply and the corrosion measuring element are connected through the first lead to form a first loop; the giant magnetoresistance sensor, the operational amplifier and the power amplifier are sequentially connected through the second wire to form a second loop; wherein the first wire penetrates through the magnetic ring, the second wire is wound on the magnetic ring by n circles, and the giant magnetoresistance sensor is arranged on the magnetic ring and used for detecting the change of a magnetic field in the magnetic ring. The corrosion sensor can be placed in any corrosive environment, is not limited by any condition, is very wide in application range, can measure the corrosion strength in the environment in real time, is very short in measurement period, and improves the measurement efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of corrosion detection, and in particular to a corrosion sensor and an application method thereof. Background Art

[0002] Metal corrosion is a common phenomenon that not only causes serious damage to the metal material itself, but also brings extensive and far-reaching harm to the national economy, environment and human health. Therefore, it is very important to study metal corrosion and corrosion protection.

[0003] In related technologies, the corrosion intensity research of automobiles is mainly based on the corrosion coupon method, which is to put a metal sample of known mass into the corrosion system, take it out, clean it, weigh it after a certain exposure period, and measure the average corrosion rate according to the change in the mass of the sample. It has the characteristics of intuitive data and reliable results.

[0004] However, since the test cycle of the coupon method is limited by production conditions and maintenance plans, it is very passive for corrosion testing, resulting in limitations on its scope of application. Summary of the invention

[0005] In view of the above problems, the present invention is proposed to provide a corrosion sensor and an application method thereof for solving the above problems. A corrosion sensor can be designed using the giant magnetoresistance effect. The corrosion sensor can be placed in any corrosive environment without being restricted by any conditions. The application range is very wide, and the corrosion intensity in the environment can be measured in real time. The measurement cycle is very short, thereby improving the measurement efficiency.

[0006] In a first aspect, the present invention provides a corrosion sensor, including a power supply, a corrosion measuring element, a first wire, a giant magnetoresistance sensor, a magnetic ring, an operational amplifier, a second wire and a power amplifier;

[0007] The power supply and the corrosion measuring element are connected via the first wire to form a first loop;

[0008] The giant magnetoresistance sensor, the operational amplifier and the power amplifier are connected in sequence through the second wire to form a second loop;

[0009] The first conducting wire passes through the magnetic ring, the second conducting wire is wound around the magnetic ring for n turns, and the giant magnetoresistance sensor is arranged on the magnetic ring to detect the change of the magnetic field in the magnetic ring.

[0010] Optionally, the corrosion measuring element includes an insulating substrate and a metal element;

[0011] One surface of the metal element is exposed to the air, and the other surface is wrapped by the insulating substrate.

[0012] Optionally, there are multiple metal elements.

[0013] Optionally, the multiple metal elements are connected in parallel.

[0014] Optionally, the giant magnetoresistance sensor comprises a multilayer film material, each layer of the film material comprises a first material and a second material;

[0015] The first material includes cobalt, iron and boron, and the second material includes copper.

[0016] Optionally, the proportions of the cobalt element, the iron element and the boron element in the first material are 20%, 60% and 20% respectively.

[0017] Optionally, the copper element accounts for 100% of the second material.

[0018] Optionally, the multi-layer material includes 20 layers.

[0019] In a second aspect, the present invention provides an application method of a corrosion sensor, the application method comprising:

[0020] Placing the corrosion sensor in a corrosive environment and obtaining a current output by the corrosion sensor;

[0021] Substituting the current into a pre-established formula to obtain the corroded thickness of the corrosion measuring element;

[0022] Based on the thickness, the corrosion intensity is determined.

[0023] Optionally, determining the corrosion intensity according to the corrosion thickness includes:

[0024] The thickness is taken as the corrosion intensity, or,

[0025] The density of the metal element is obtained, the corrosion mass is calculated according to the thickness and the density, and the corrosion mass is used as the corrosion intensity.

[0026] In a third aspect, the present invention provides an electronic device comprising: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the method described in the first aspect by executing the computer instructions.

[0027] In a fourth aspect, the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the method described in the first aspect.

[0028] The technical solution provided in the embodiments of the present invention has at least the following technical effects or advantages:

[0029] The embodiment of the present invention provides a corrosion sensor and an application method thereof. The corrosion sensor includes a power supply, a corrosion measuring element, a first wire, a giant magnetoresistance sensor, a magnetic ring, an operational amplifier, a second wire and a power amplifier. The power supply and the corrosion measuring element are connected through the first wire to form a first loop, and the corrosion condition of the corrosion measuring element is reflected by the current in the first loop. The giant magnetoresistance sensor, the operational amplifier and the power amplifier are connected in sequence through the second wire to form a second loop, and the change of the corrosion condition is amplified by the current in the second loop. The first wire passes through the center of the magnetic ring, and the second wire is wound around the magnetic ring n times. The giant magnetoresistance sensor is arranged on the magnetic ring to detect the change of the magnetic field in the magnetic ring. When the current in the first loop changes, the magnetic field in the magnetic ring changes. The change of the magnetic field in the magnetic ring causes the voltage output by the giant magnetoresistance sensor to change, thereby causing the current in the second loop to change. A corrosion sensor is designed by using the giant magnetoresistance effect. The corrosion sensor can be placed in any corrosive environment for detection, is not limited by any conditions, has a very wide range of applications, and can measure the corrosion intensity in the environment in real time. The measurement cycle is very short, and the measurement efficiency and accuracy are improved.

[0030] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0032] Figure 1 is a structural schematic diagram of a corrosion sensor provided by an embodiment of the present invention;

[0033] Figure 2 is a side view of a corrosion measuring element provided by an embodiment of the present invention;

[0034] Figure 3 is a top view of a corrosion measuring element provided by an embodiment of the present invention;

[0035] Figure 4 It is a flow chart of an application method of a corrosion sensor provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the present application clearer, the implementation mode of the present application will be further described in detail below in conjunction with the accompanying drawings. It should be understood that the embodiments of the present disclosure and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application, rather than limitations on the technical solutions of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0037] Figure 1 is a schematic diagram of the structure of a corrosion sensor provided by an embodiment of the present invention, such as Figure 1 As shown, the corrosion sensor includes a power supply 1, a corrosion measuring element 2, a first wire 3, a giant magnetoresistance sensor 4, a magnetic ring 5, an operational amplifier 6, a second wire 7 and a power amplifier 8; the power supply 1 and the corrosion measuring element 2 are connected via the first wire 3 to form a first loop; the giant magnetoresistance sensor 4, the operational amplifier 6 and the power amplifier 8 are connected in sequence via the second wire 7 to form a second loop; wherein the first wire 3 passes through the magnetic ring 5, the second wire 7 is wound around the magnetic ring 5 for n turns, and the giant magnetoresistance sensor 4 is arranged on the magnetic ring 5 to detect changes in the magnetic field within the magnetic ring 5.

[0038] The number of turns of the first conductive wire 3 in the magnetic ring 5 is generally one.

[0039] In this embodiment, the corrosion measuring element 2 is made of metal, and its resistance is one of the important physical properties. Under room temperature conditions, the resistance of the corrosion measuring element 2 placed in the atmospheric environment remains basically unchanged. After the corrosion measuring element 2 is corroded, the corrosion product is metal oxide, which is an insulator, so the corrosion affects the resistance of the corrosion measuring element 2. The power supply 1 is connected to both ends of the corrosion measuring element 2, and a current is generated in the corrosion measuring element 2. When the metal is corroded, the resistance of the corrosion measuring element 2 changes, and the current changes accordingly, but the current change is very small and not very obvious. Therefore, according to the Oersted effect, it is known that the magnetic field around the corrosion measuring element 2 will change accordingly with the change of the current. Therefore, the corrosion intensity can be measured by monitoring the magnetic field. However, since the change of the current is very small, the change of the magnetic field is also very small, and the giant magnetoresistance effect (Giant Magneto Resistance, GMR) can be used to detect the change of the tiny magnetic field. The resistivity of the giant magnetoresistance material changes significantly under the action of the magnetic field. With the help of this principle, the accurate measurement of the tiny current change can be achieved.

[0040] Specifically, when testing the corrosion intensity of an environment, the corrosion sensor can be placed in the tested environment, and the output voltage of the power supply 1 in the first circuit is U0, so that the first current I0 is generated in the first circuit. Since the first wire 3 passes through the magnetic ring 5, the first current I0 therein will generate a magnetic field in the magnetic ring 5, and the generated magnetic field is sensed by the giant magnetoresistance sensor 4. When the giant magnetoresistance sensor 4 does not sense the magnetic field, the differential voltage output by the giant magnetoresistance sensor 4 is 0. When the magnetic field in the magnetic ring 5 is sensed, a differential voltage U greater than 0 is output. m , differential voltage U m After being amplified by the operational amplifier 6, it is then amplified by the power amplifier 8, and the power amplifier 8 outputs the feedback current I G Since the second conductor 7 is wound around the magnetic ring 5 for n turns, the feedback current I G A magnetic field is also generated in the magnetic ring 5, and the feedback current I G The direction of the magnetic field induced by the first current I0 in the magnetic ring 5 is opposite to that of the first current I0, and they cancel each other out, so that the magnetic field induced by the first current I0 in the magnetic ring 5 is getting smaller, the total magnetic field sensed by the giant magnetoresistance sensor 4 is reduced, and the differential voltage output by the giant magnetoresistance sensor 4 is also reduced, and then the feedback current I G It also decreases until the magnetic field induced by the first current I0 is completely offset, so that the magnetic field in the magnetic ring 5 is 0, and the differential voltage output by the giant magnetoresistance sensor 4 is zero, thereby the feedback current I G is also 0, and the corrosion sensor enters a state of equilibrium.

[0041] It should be noted that each feedback current I G The process from generation to recovery to zero is completed within one microsecond. Then, the magnetic field is induced in the magnetic ring 5 by the first current I0, breaking the balance and generating a feedback current I G , and then the magnetic field is offset, and the cycle is repeated. As a result, the corrosion sensor is basically in a balanced state, and is not disturbed by the changes in the magnetic field caused by changes in the external environment. It has high stability and strong anti-interference ability. When the corrosion measuring element 2 is corroded, the corroded corrosion measuring element 2 will produce metal oxides. The metal oxides are insulators, which cause the metal thickness of the corrosion measuring element 2 to be thinned, causing its resistance R to change. The voltage U0 of the power supply 1 remains unchanged, and the first current I0 will change with the change of the resistance R, and the size of the induced magnetic field will also change, making the differential voltage U output for the first time in each cycle m will also change, following the first generated feedback current I G will also be different, so according to the first feedback current I in each cycle G The corrosion sensor can reflect the corrosion condition of the corrosion measuring element 2 and the corrosion intensity of the environment. The corrosion sensor can also include a controller, which can GThe corrosion intensity is determined so that the corrosion sensor can directly output the corrosion intensity.

[0042] In this embodiment, the first circuit may further include a first protection resistor for protecting the safety of the first circuit, for example, the first protection resistor is 10 ohms; the second circuit may further include a second protection resistor for protecting the safety of the second circuit. The power source 1 may be a battery or an external power source 1, for example, the power source may be 5V.

[0043] Optionally, the corrosion measuring element 2 includes an insulating substrate and a metal element; one surface of the metal element is exposed to the air, and the other surfaces are wrapped by the insulating substrate.

[0044] Figure 2 is a side view of a corrosion measuring element provided by an embodiment of the present invention, such as Figure 2 As shown, the insulating matrix 21 wraps the other surfaces of the metal element 22, leaving only the top surface exposed to the outside, and then the first wire 3 is connected to the metal element 22 through the insulating matrix 21, and the metal element 22 is corroded slowly from the top surface downward. Among them, the insulating matrix 21 is non-conductive, and its material can be a non-conductive material such as epoxy resin, and can also protect the metal element 22, and the metal element 22 can be composed of a long strip of metal, for example, made of Q235, or aluminum alloy, copper alloy, etc.

[0045] Optionally, there are multiple metal elements 22.

[0046] In this embodiment, when there are multiple metal components 22, the top of each metal component 22 will be exposed to the environment and will be corroded. The final corrosion intensity measurement will be caused by the comprehensive corrosion conditions of all metal components 22, making the test result more accurate.

[0047] Optionally, a plurality of metal elements 22 are connected in parallel.

[0048] For example, Figure 3 is a top view of a corrosion measuring element provided by an embodiment of the present invention, such as Figure 3 As shown, the corrosion measuring element 2 includes four metal elements 22, all of which are connected in parallel. The final resistance R of the corrosion measuring element 2 is R r / 4, R r is the resistance of each metal element 22. Finally, the measured corrosion intensity is determined by the average corrosion conditions of the four metal elements 22, so that the test results can more truly reflect the corrosion intensity of the environment.

[0049] Optionally, the giant magnetoresistive sensor 4 includes a multilayer film material, each layer of the film material includes a first material and a second material; the first material includes cobalt, iron and boron, and the second material includes copper.

[0050] In this embodiment, the resistivity of the multilayer film material changes significantly under the action of an external magnetic field, and is usually composed of a superposition of a magnetic material and a non-magnetic material. The magnetic material is recorded as the first material, including cobalt, iron and boron elements, so that the first material can sense changes in the magnetic field; the non-magnetic material is recorded as the second material, including copper elements, so that the second material has the function of isolation and regulation. A first material and a second material form a layer of film material, and then multiple layers of film materials are superimposed to obtain a multilayer film material.

[0051] Optionally, the proportions of cobalt, iron and boron in the first material are 20%, 60% and 20% respectively.

[0052] In this embodiment, the first material composed of 20% cobalt, 60% iron and 20% boron is more sensitive to changes in the inductive magnetic field.

[0053] Optionally, the proportion of copper element in the second material is 100%.

[0054] In this embodiment, the second material with 100% copper element can play a better role in isolating the two first materials and can also ensure that the interaction between the magnetic layers is controlled, thereby achieving sensitive detection of magnetic field changes.

[0055] The thickness of the first material may be 2 μm (micrometer), and the thickness of the second material may be 0.8 μm (micrometer), so as to be more sensitive to changes in the magnetic field.

[0056] Optionally, the multi-layer material includes 20 layers.

[0057] In this embodiment, the 20-layer multi-film material enables the giant magnetoresistive sensor 4 to have better sensing performance indicators.

[0058] The performance indicators of the giant magnetoresistance sensor 4 are shown in the following table:

[0059] Table 1

[0060]

[0061] Wherein, ΔR / R represents magnetoresistance, Hs represents the interlayer coupling equivalent field intensity, and (ΔR / R) / Hs represents the magnetoresistance change sensitivity.

[0062] Exemplarily, the corrosion sensors with different parameters are manufactured using the above structure as follows:

[0063] Table 1

[0064]

[0065] Based on the same inventive concept, an embodiment of the present invention further provides an application method of a corrosion sensor. Figure 4 is a flow chart of an application method of a corrosion sensor provided by an embodiment of the present invention, such as Figure 4 As shown, the application method includes:

[0066] Step S410: placing the corrosion sensor in a corrosive environment and obtaining the current output by the corrosion sensor.

[0067] In this embodiment, the corrosion sensor is the corrosion sensor mentioned above. The current output by the corrosion sensor is the feedback current I mentioned above. G .

[0068] Step S420: Substitute the current into the pre-built formula to obtain the corroded thickness of the corrosion measuring element.

[0069] In this embodiment, the feedback current I G The magnetic field induced by the first current I0 in the magnetic ring is opposite in direction and cancels each other out, indicating that the total magnetic field strength they ultimately generate is the same. The magnetic field strength is related to the magnetic flux potential and area. Since the magnetic field is generated in the magnetic ring, the magnetic field strength is only related to the magnetic flux potential, and the magnetic flux potential is equal to the product of the current flowing through the coil and the number of turns of the coil. Therefore, based on the ampere-turn balance principle, the following equation exists:

[0070] I0*N R =I G总 *n (1);

[0071] Among them, N R Indicates the number of turns of the first conductor in the magnetic ring, I G总 Indicates the I generated each time in a cycle G By adjusting the operational amplifier, the first generated I G It is relatively large, and tries to offset the magnetic field induced by the first charge I0 in the magnetic ring. If there is still a residual magnetic field, it will continue to generate several very small I G , completely cancel out the residual magnetic field, and in the calculation process, the smaller I G can be ignored, so I G总 ≈I G , so we can deduce:

[0072] I0*N R =I G *n (2);

[0073] Transform formula (2) into:

[0074]

[0075] In this embodiment, the feedback current I measured by the corrosion sensor can be transmitted through the data transmission system. G , and the feedback current I G Entry and storage.

[0076] In this embodiment, the following equation exists in the first loop:

[0077]

[0078] Next, we combine formula (3) and formula (4) to obtain the following formula:

[0079]

[0080] In this embodiment, the length, width and thickness of the metal element before corrosion are recorded as L, a and b respectively, the thickness loss caused by corrosion is Δb, the resistivity is ρ, and the initial resistance of the metal element is R r0 , the resistance after corrosion is R r1 According to the basic properties of metal resistance:

[0081]

[0082] Combining formula (6) and formula (7), we can deduce:

[0083]

[0084] Because the resistance R in equation (5) is the resistance R after corrosion. r1 , so formula (5) and formula (8) are combined to obtain the following formula:

[0085]

[0086] Because, ρ, R r0 、R0、U0、n、N R , L, a and b are all fixed values, so the real-time measured feedback current I G Transmitted to the data processing system, the data processing system will feedback the current I G Substitute it into formula (9) to calculate the corrosion thickness.

[0087] Step S430: Determine the corrosion intensity according to the thickness.

[0088] Optionally, step S430 includes:

[0089] The thickness is used as the corrosion intensity. Alternatively, the density of the metal component is obtained, the corrosion mass is calculated based on the thickness and density, and the corrosion mass is used as the corrosion intensity.

[0090] In one implementation of this embodiment, the corrosion intensity can be directly reflected by the thickness of the corrosion, and the thickness is used as the corrosion intensity. The greater the thickness of the corrosion, the greater the corrosion intensity.

[0091] In another implementation of this embodiment, the corrosion mass of the corrosion measuring element can be used as the corrosion intensity. Specifically, the initial mass of the metal element before corrosion is m0, so the mass m1 after corrosion is:

[0092]

[0093] In this embodiment, the mass m1 after corrosion can also be P*a*L*Δb, where P is the density of the metal element. The value of the corrosion intensity determined at a certain time point can be displayed by the display system, or it can be displayed as a curve of the corrosion intensity changing with time, and the displayed content can also be adjusted according to user needs.

[0094] Therefore, the corrosion intensity can be output in the form of corrosion depth Δb through pre-stored data and measured data, or in the form of corrosion weight loss per unit area.

[0095] For example, the above corrosion sensor was placed on the roof of a parking lot in an industrial park. The test lasted for 1 year. The corrosion intensity data obtained are shown in the following table:

[0096] Table 2

[0097]

[0098]

[0099] In this embodiment, the above-mentioned corrosion sensor can realize online detection of environmental corrosion intensity, provide detection means support for obtaining the corrosion intensity of the target market, and provide theoretical support for the development of anti-corrosion in the global market.

[0100] An embodiment of the present invention further provides an electronic device, which may include a processor and a memory, wherein the processor and the memory may be communicatively connected to each other via a bus or other means.

[0101] The processor may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application, or may also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components and other chips, or a combination of the above-mentioned chips.

[0102] The memory may include a large capacity memory for data or instructions. By way of example and not limitation, the memory may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive or a combination of two or more of these. Where appropriate, the memory may include a removable or non-removable (or fixed) medium. Where appropriate, the memory may be inside or outside the electronic device. In a particular embodiment, the memory may be a non-volatile solid-state memory.

[0103] In one example, the memory may be a read-only memory (ROM). In one example, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM), or a flash memory, or a combination of two or more of these.

[0104] The processor implements any one of the corrosion sensor application methods in the above embodiments by reading and executing computer program instructions stored in the memory.

[0105] In one example, the electronic device may further include a communication interface and a bus. Among them, the processor, memory, and communication interface are connected through a bus and communicate with each other. The communication interface is mainly used to realize the communication between the modules, devices, units and / or devices in the embodiment of the present application. Where appropriate, the bus may include one or more buses.

[0106] In addition, in combination with the application method of the corrosion sensor in the above embodiment, the embodiment of the present invention can provide a computer-readable storage medium for implementation. The computer-readable storage medium stores computer program instructions; when the computer program instructions are executed by a processor, any one of the application methods of the corrosion sensor in the above embodiment is implemented.

[0107] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium, and when the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, the storage medium can be a read-only memory (ROM), a random access memory (RAM), a flash memory, a hard disk drive (HDD) or a solid-state drive (SSD), etc.; the storage medium can also include a combination of the above-mentioned types of memory.

[0108] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0109] The embodiment of the present invention provides a corrosion sensor and an application method thereof. The corrosion sensor includes a power supply, a corrosion measuring element, a first wire, a giant magnetoresistance sensor, a magnetic ring, an operational amplifier, a second wire and a power amplifier. The power supply and the corrosion measuring element are connected through the first wire to form a first loop, and the corrosion condition of the corrosion measuring element is reflected by the current in the first loop. The giant magnetoresistance sensor, the operational amplifier and the power amplifier are connected in sequence through the second wire to form a second loop, and the change of the corrosion condition is amplified by the current in the second loop. The first wire passes through the center of the magnetic ring, and the second wire is wound around the magnetic ring n times. The giant magnetoresistance sensor is arranged on the magnetic ring to detect the change of the magnetic field in the magnetic ring. When the current in the first loop changes, the magnetic field in the magnetic ring changes, and the magnetic field change in the magnetic ring causes the voltage output by the giant magnetoresistance sensor to change, thereby causing the current in the second loop to change. A corrosion sensor is designed by using the giant magnetoresistance effect. The corrosion sensor can be placed in any corrosive environment for detection, is not limited by any conditions, has a very wide range of applications, and can measure the corrosion intensity in the environment in real time. The measurement cycle is very short, and the measurement efficiency is improved.

[0110] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0111] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the present invention, various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting the intention that the claimed invention requires more features than those explicitly recited in each claim. More specifically, as reflected in the claims below, inventive aspects lie in less than all the features of the individual embodiments disclosed above. Therefore, the claims that follow the specific embodiment are hereby expressly incorporated into the specific embodiment, with each claim itself serving as a separate embodiment of the present invention.

[0112] It should be noted that the above embodiments illustrate the present invention rather than limit it, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets shall not be construed as a limitation on the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "one" or "an" preceding a component does not exclude the presence of a plurality of such components. The present invention may be implemented by means of hardware comprising a number of different components and by means of a suitably programmed computer. In a unit claim enumerating a number of devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc., does not indicate any order. These words may be interpreted as names.

Claims

1. A corrosion sensor, characterized in that: The corrosion sensor comprises a power supply, a corrosion measuring element, a first wire, a giant magnetoresistance sensor, a magnetic ring, an operational amplifier, a second wire and a power amplifier; The power supply and the corrosion measuring element are connected via the first wire to form a first loop; The giant magnetoresistance sensor, the operational amplifier and the power amplifier are connected in sequence through the second wire to form a second loop; The first conducting wire passes through the magnetic ring, the second conducting wire is wound around the magnetic ring for n turns, and the giant magnetoresistance sensor is arranged on the magnetic ring to detect the change of the magnetic field in the magnetic ring.

2. The corrosion sensor according to claim 1, characterized in that: The corrosion measuring element comprises an insulating substrate and a metal element; One surface of the metal element is exposed to the air, and the other surface is wrapped by the insulating substrate.

3. The corrosion sensor according to claim 2, characterized in that: There are multiple metal elements.

4. The corrosion sensor according to claim 3, characterized in that: The plurality of metal elements are connected in parallel.

5. The corrosion sensor according to claim 1, characterized in that: The giant magnetoresistance sensor comprises a multilayer film material, each layer of the film material comprises a first material and a second material; The first material includes cobalt, iron and boron, and the second material includes copper.

6. The corrosion sensor according to claim 5, characterized in that: The proportions of the cobalt element, the iron element and the boron element in the first material are 20%, 60% and 20% respectively.

7. The corrosion sensor according to claim 5, characterized in that: The copper element accounts for 100% of the second material.

8. The corrosion sensor according to claim 5, characterized in that: The multi-layer material includes 20 layers.

9. An application method of a corrosion sensor, characterized in that: The corrosion sensor is the corrosion sensor described in any one of claims 1 to 8, and the application method comprises: Placing the corrosion sensor in a corrosive environment and obtaining a current output by the corrosion sensor; Substituting the current into a pre-established formula to obtain the corroded thickness of the corrosion measuring element; Based on the thickness, the corrosion intensity is determined.

10. The application method of the corrosion sensor according to claim 9, characterized in that: Based on the corrosion thickness, determining the corrosion intensity includes: The thickness is taken as the corrosion intensity, or, The density of the metal element is obtained, the corrosion mass is calculated according to the thickness and the density, and the corrosion mass is used as the corrosion intensity.

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