Corrosion sensor and method of use thereof

Abstract

The application discloses a kind of corrosion sensor and its application method, belong to corrosion detection technical field.The corrosion sensor includes power supply, corrosion measuring element, first wire, giant magnetoresistance sensor, magnetic ring, operational amplifier, second wire and power amplifier;The power supply and the corrosion measuring element are connected by the first wire, and constitute first loop;The giant magnetoresistance sensor, the operational amplifier and the power amplifier are sequentially connected by the second wire, and constitute second loop;Wherein, the first wire passes through the magnetic ring, the second wire is wound n turns on the magnetic ring, the giant magnetoresistance sensor is arranged on the magnetic ring, for detecting the magnetic field change in the magnetic ring.The corrosion sensor can be placed in any corrosive environment, not limited by any condition, the application range is very extensive, and the corrosion intensity in environment can be measured in real time, the measurement period is very short, and the measurement efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of corrosion detection technology, and in particular to a corrosion sensor and its application method. Background Technology

[0002] Metal corrosion is a ubiquitous phenomenon that not only severely damages the metal materials themselves but also poses widespread and profound threats to the national economy, the environment, and human health. Therefore, research on metal corrosion and corrosion protection is of paramount importance.

[0003] In related technologies, the corrosion intensity study of automobiles mainly uses the corrosion plate method, which involves placing a metal sample of known mass into a corrosion system, exposing it for a certain period of time, then removing, cleaning, and weighing it. The average corrosion rate is then measured based on the change in sample mass. This method is characterized by its intuitive data and reliable results.

[0004] However, the testing cycle of the plate method is limited by production conditions and maintenance plans, which is very passive for corrosion testing and limits its application scope. Summary of the Invention

[0005] In view of the above problems, the present invention is proposed to provide a corrosion sensor and its application method that solve 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 any restrictions, has a very wide range of applications, and can measure the corrosion intensity in the environment in real time with a very short measurement cycle, thus improving measurement efficiency.

[0006] In a first aspect, the present invention provides a corrosion sensor, comprising a power supply, a corrosion measuring element, a first wire, a giant magnetoresistive 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 through the first wire to form a first circuit;

[0008] The giant magnetoresistive sensor, the operational amplifier, and the power amplifier are connected in sequence via the second wire to form a second circuit;

[0009] The first wire passes through the magnetic ring, the second wire is wound n turns around the magnetic ring, and the giant magnetoresistive sensor is arranged on the magnetic ring to detect changes in the magnetic field inside the magnetic ring.

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

[0011] One side of the metal element is exposed to air, while the other sides are encased in the insulating substrate.

[0012] Optionally, there may be multiple metal elements.

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

[0014] Optionally, the giant magnetoresistive sensor includes a multilayer film material, each layer of which includes 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 cobalt, iron, and boron in the first material are 20%, 60%, and 20%, respectively.

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

[0018] Optionally, the multilayer material comprises 20 layers.

[0019] Secondly, the present invention provides a method for applying a corrosion sensor, the method comprising:

[0020] The corrosion sensor is placed in a corrosive environment, and the current output by the corrosion sensor is obtained;

[0021] Substituting the current into a pre-established formula, the thickness of the corrosion measured element is obtained;

[0022] The corrosion intensity is determined based on the thickness.

[0023] Optionally, determining the corrosion intensity based on the corrosion thickness includes:

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

[0025] Obtain the density of the metal component, calculate the corrosion mass based on the thickness and the density, and use the corrosion mass as the corrosion intensity.

[0026] Thirdly, the present invention provides an electronic device comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the computer instructions to perform the method as described in the first aspect.

[0027] Fourthly, the present invention provides a computer-readable storage medium storing computer instructions for causing the computer to perform the method as described in the first aspect.

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

[0029] This invention provides a corrosion sensor and its application method. The corrosion sensor includes a power supply, a corrosion measuring element, a first wire, a giant magnetoresistive (GMR) 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 circuit. The current in the first circuit reflects the corrosion status of the corrosion measuring element. The GMR sensor, operational amplifier, and power amplifier are sequentially connected via the second wire to form a second circuit. The current in the second circuit amplifies changes in the corrosion status. The first wire passes through the center of the magnetic ring, and the second wire is wound n times around the magnetic ring. The GMR sensor is arranged on the magnetic ring to detect changes in the magnetic field within the magnetic ring. When the current in the first circuit changes, it causes a change in the magnetic field in the magnetic ring. This change in the magnetic field causes a change in the voltage output of the GMR sensor, which in turn causes a change in the current in the second circuit. This corrosion sensor, designed using the giant magnetoresistive effect, can be placed in any corrosive environment for detection, without any limitations. Its application range is very wide, and it can measure the corrosion intensity in the environment in real time with a very short measurement cycle, improving measurement efficiency and accuracy.

[0030] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0031] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0032] Figure 1 This is a schematic diagram of the structure of a corrosion sensor provided in an embodiment of the present invention;

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

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

[0035] Figure 4 This is a flowchart of an application method of a corrosion sensor provided in an embodiment of the present invention. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings. It should be understood that the embodiments of this disclosure and the specific features in the embodiments are detailed descriptions of the technical solutions of this application, rather than limitations on the technical solutions of this application. Unless otherwise specified, the embodiments of this application and the technical features in the embodiments can be combined with each other.

[0037] Figure 1 This is a schematic diagram of the structure of a corrosion sensor provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the corrosion sensor includes a power supply 1, a corrosion measuring element 2, a first wire 3, a giant magnetoresistive 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 through the first wire 3 to form a first circuit. The giant magnetoresistive sensor 4, the operational amplifier 6, and the power amplifier 8 are connected sequentially through the second wire 7 to form a second circuit. The first wire 3 passes through the magnetic ring 5, the second wire 7 is wound n turns around the magnetic ring 5, and the giant magnetoresistive 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 conductor 3 within the magnetic ring 5 is generally 1.

[0039] In this embodiment, the corrosion measuring element 2 is made of metal, and its resistance is one of its important physical properties. At room temperature, the resistance of the corrosion measuring element 2 placed in an atmospheric environment remains essentially unchanged. However, after corrosion occurs in the corrosion measuring element 2, the corrosion product is metal oxide. Since metal oxide is an insulator, corrosion affects the resistance of the corrosion measuring element 2. When a power supply 1 is applied across the corrosion measuring element 2, a current is generated within it. When the metal corrodes, the resistance of the corrosion measuring element 2 changes, and the current changes accordingly, but this change is very small and not very noticeable. Therefore, according to the Oersted effect, the magnetic field around the corrosion measuring element 2 will change accordingly with the change in current. Thus, the corrosion intensity can be measured by monitoring the magnetic field. However, because the change in current is very small, the change in magnetic field is also very small. Therefore, the giant magnetoresistance (GMR) effect can be used to detect the small changes in the magnetic field. The resistivity of a giant magnetoresistance material changes significantly under the influence of a magnetic field. This principle can be used to achieve accurate measurement of minute current changes.

[0040] Specifically, during the corrosion intensity test, the corrosion sensor can be placed in the environment being tested. The output voltage of power supply 1 in the first circuit is U0, causing a first current I0 to be generated in the first circuit. Since the first wire 3 passes through the magnetic ring 5, the first current I0 will generate a magnetic field in the magnetic ring 5, which is sensed by the giant magnetoresistive sensor 4. When the giant magnetoresistive sensor 4 does not sense a magnetic field, the differential voltage output is 0. When it senses the magnetic field in the magnetic ring 5, it will output a differential voltage U greater than 0. m Differential voltage U m After being amplified by operational amplifier 6, it is further amplified by power amplifier 8, and the output feedback current I of power amplifier 8 is obtained. G Because the second wire 7 is wound n turns around the magnetic ring 5, the feedback current I... G A magnetic field is also generated inside the magnetic ring 5, and the feedback current I G The magnetic field induced by the first current I0 within the magnetic ring 5 is opposite in direction and cancels out, causing the magnetic field induced by the first current I0 within the magnetic ring 5 to decrease. This reduces the total magnetic field sensed by the giant magnetoresistive sensor 4, and consequently reduces the differential voltage output by the giant magnetoresistive sensor 4. Then, the feedback current I... G It also decreases until it completely cancels out the magnetic field induced by the first current I0, making the magnetic field inside the magnetic ring 5 zero, and the differential voltage output by the giant magnetoresistive sensor 4 zero, thus feedback current I... G The value is also 0, indicating that the corrosion sensor has entered a balanced state.

[0041] It should be noted that the feedback current I each time G The entire process, from generation to recovery to zero, takes only one microsecond. Then, the magnetic ring 5 will be induced with a magnetic field by the first current I0, breaking the balance and generating a feedback current I. G Then, magnetic field cancellation is performed, and this cycle is repeated. Thus, the corrosion sensor remains essentially in equilibrium, unaffected by changes in the magnetic field caused by external environmental variations, exhibiting high stability and strong anti-interference capability. When the corrosion measuring element 2 is corroded, it produces metal oxides. These metal oxides are insulators, causing a reduction in the metal thickness of the corrosion measuring element 2, resulting in a change in its resistance R. Meanwhile, the voltage U0 of power supply 1 remains constant. The first current I0 changes with the change in resistance R, and the magnitude of the induced magnetic field also changes, causing the differential voltage U0 output in the first cycle to change. m It will also change, following the initial feedback current I. G It will also be different, so, based on the initial feedback current I in each cycle... G It can reflect the corrosion status of the corrosion measuring element 2 and the intensity of environmental corrosion. The corrosion sensor may also include a controller, which adjusts the input based on the feedback current I. GDetermine the corrosion intensity so that the corrosion sensor can directly output the corrosion intensity.

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

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

[0044] Figure 2 This is a side view of a corrosion measuring element provided in an embodiment of the present invention, as shown below. Figure 2 As shown, the insulating substrate 21 covers all other surfaces of the metal element 22, leaving only the top surface exposed. The first conductor 3 connects to the metal element 22 through the insulating substrate 21, and the metal element 22 is slowly corroded downwards from the top surface. The insulating substrate 21 is non-conductive and can be made of non-conductive materials such as epoxy resin. It also protects the metal element 22. The metal element 22 can be composed of long strips of metal, such as Q235, or aluminum alloy, copper alloy, etc.

[0045] Optionally, there may be multiple metal components 22.

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

[0047] Optional, multiple metal elements 22 connected in parallel.

[0048] For example, Figure 3 This is a top view of a corrosion measuring element provided in an embodiment of the present invention, as shown below. 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 The resistance of each metal element 22 is measured. Ultimately, the measured corrosion intensity is determined by the average corrosion of the four metal elements 22, allowing the test results to more accurately reflect the corrosion intensity of the environment.

[0049] Optionally, the giant magnetoresistive sensor 4 includes a multilayer film material, each layer of which 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 influence of an external magnetic field, and it is typically composed of a superposition of magnetic and non-magnetic materials. The magnetic material, referred to as the first material, includes elements such as cobalt, iron, and boron, enabling it to sense changes in the magnetic field. The non-magnetic material, referred to as the second material, includes copper, providing isolation and regulation functions. One first material and one second material constitute a single layer of film material, and multiple single-layer film materials are then stacked 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 magnetic field.

[0053] Optionally, the second material may contain 100% copper.

[0054] In this embodiment, the second material, which is 100% copper, can better isolate the two first materials and also ensure that the interaction between the magnetic layers is controlled, thereby enabling sensitive detection of changes in the magnetic field.

[0055] The thickness of the first material can be 2 μm (micrometers), and the thickness of the second material can be 0.8 μm (micrometers), making it more sensitive to changes in the magnetic field.

[0056] Optionally, the multilayer 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.

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

[0059] Table 1

[0060]

[0061] Where ΔR / R represents magnetoresistivity, Hs represents the magnetic field strength of the interlayer coupling equivalent field, and (ΔR / R) / Hs represents the sensitivity to magnetoresistivity changes.

[0062] For example, corrosion sensors with different parameters are fabricated using the above structure as follows:

[0063] Table 1

[0064]

[0065] Based on the same inventive concept, this invention also provides a method for applying a corrosion sensor. Figure 4 This is a flowchart of an application method of a corrosion sensor provided in an embodiment of the present invention, such as... Figure 4 As shown, the application method includes:

[0066] Step S410: Place the corrosion sensor in a corrosive environment and obtain 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 earlier. G .

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

[0069] In this embodiment, the feedback current I G The magnetic field induced by the first current I0 within the magnetic ring is opposite in direction and cancels each other out, indicating that the total magnetic field strength they ultimately produce is the same. Since magnetic field strength is related to magnetomotive force and area, and the magnetic fields are all generated within the magnetic ring, the magnetic field strength is only related to the magnetomotive force, which 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] Where, N R I represents the number of turns of the first conductor inside the magnetic ring. G总 This represents the I generated each time within a cycle. G The sum of . By adjusting the operational amplifier, the first generated I is made G The magnitude is relatively large, and it tries to counteract the magnetic field induced by the initial charge I0 within the magnetic ring. If a residual magnetic field remains, it will continue to generate several very small I values. G This completely cancels out the residual magnetic field, and in the subsequent smaller I values ​​during the calculation process... G It can be ignored, so I G总 ≈I G Therefore, it can be deduced that:

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

[0073] Equation (2) can be transformed into:

[0074]

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

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

[0077]

[0078] Next, combining formulas (3) and (4) yields the following formula:

[0079]

[0080] In this embodiment, the length, width, and thickness of the metal element before corrosion are denoted as L, a, and b, respectively; the thickness loss due to 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 Based on the fundamental properties of metallic resistance, we obtain:

[0081]

[0082] Combining formulas (6) and (7), we can derive:

[0083]

[0084] Because the resistor R in formula (5) is the same as the resistor R after corrosion. r1 Therefore, by combining formulas (5) and (8), we 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 The data is transmitted to the data processing system, which then feeds back the current I. G Substitute into formula (9) to calculate the corrosion thickness.

[0087] Step S430: Determine the corrosion intensity based on the thickness.

[0088] Optionally, step S430 includes:

[0089] The thickness can be used as the corrosion intensity, or the density of the metal component can be obtained, and the corrosion quality can be calculated based on the thickness and density, with the corrosion quality being used as the corrosion intensity.

[0090] In one implementation of this embodiment, the corrosion intensity can be directly reflected by the thickness of the corroded material. The greater the thickness of the corroded material, 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 component. The display system can show the numerical value of the corrosion intensity at a specific point in time, or it can display a curve of the corrosion intensity changing over time. The displayed content can also be adjusted according to user needs.

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

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

[0096] Table 2

[0097]

[0098]

[0099] In this embodiment, the corrosion sensor described above enables online detection of environmental corrosion intensity, providing a means of detection to obtain corrosion intensity in the target market and theoretical support for the development of anti-corrosion technology in the global market.

[0100] This invention also provides an electronic device that may include a processor and a memory, wherein the processor and the memory may be interconnected via a bus or other means.

[0101] The processor can be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application. It can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or other chips, or combinations of the above types of chips.

[0102] Memory may include mass storage for data or instructions. For example, and not limitingly, memory may include hard disk drives (HDDs), floppy disk drives, flash memory, optical disks, magneto-optical disks, magnetic tape, or Universal Serial Bus (USB) drives, or combinations of two or more of these. Where appropriate, memory may include removable or non-removable (or fixed) media. Where appropriate, memory may be internal or external to an electronic device. In a particular embodiment, memory may be non-volatile solid-state memory.

[0103] In one instance, the memory may be read-only memory (ROM). In one instance, 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 flash memory, or a combination of two or more of these.

[0104] The processor reads and executes computer program instructions stored in the memory to implement any of the corrosion sensor application methods in the above embodiments.

[0105] In one example, the electronic device may further include a communication interface and a bus. The processor, memory, and communication interface are connected via the bus to communicate with each other. The communication interface is primarily used to enable communication between the various modules, devices, units, and / or equipment in the embodiments of this application. Where appropriate, the bus may include one or more buses.

[0106] Furthermore, in conjunction with the application methods of the corrosion sensors in the above embodiments, this invention can be implemented using a computer-readable storage medium. This computer-readable storage medium stores computer program instructions; when these computer program instructions are executed by a processor, they implement any of the corrosion sensor application methods in the above embodiments.

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

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

[0109] This invention provides a corrosion sensor and its application method. The corrosion sensor includes a power supply, a corrosion measuring element, a first wire, a giant magnetoresistive (GMR) 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 circuit. The current in the first circuit reflects the corrosion status of the corrosion measuring element. The GMR sensor, operational amplifier, and power amplifier are sequentially connected via the second wire to form a second circuit. The current in the second circuit amplifies changes in the corrosion status. The first wire passes through the center of the magnetic ring, and the second wire is wound n times around the magnetic ring. The GMR sensor is arranged on the magnetic ring to detect changes in the magnetic field within the magnetic ring. When the current in the first circuit changes, it causes a change in the magnetic field in the magnetic ring. This change in the magnetic field causes a change in the voltage output of the GMR sensor, which in turn causes a change in the current in the second circuit. This corrosion sensor, designed using the giant magnetoresistive effect, can be placed in any corrosive environment for detection, without any limitations. Its application range is very wide, and it can measure the corrosion intensity in the environment in real time with a very short measurement cycle, improving measurement efficiency.

[0110] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0111] Similarly, it should be understood that, in order to simplify this disclosure and aid in understanding one or more of the various aspects of the invention, in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof. However, this method of disclosure should not be construed as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as reflected in the following claims, inventive aspects lie in fewer than all features of a single foregoing disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into this detailed description, wherein each claim itself is a separate embodiment of the invention.

[0112] It should be noted that the above embodiments are illustrative of the invention and not restrictive, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in a claim. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The invention can be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.

Claims

1. A corrosion sensor, characterized by The corrosion sensor comprises a power supply, a corrosion measurement 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 measurement element are connected through the first wire to form a first loop; the first loop further comprises a first protection resistor; the corrosion measurement element comprises an insulating base and a metal element; one face of the metal element is exposed to air, and the other face is wrapped by the insulating base; the metal element is multiple, and the multiple metal elements are connected in parallel; 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 wire passes through the magnetic ring, the second wire is wound n times on the magnetic ring, and the giant magnetoresistance sensor is arranged on the magnetic ring to detect the change of the magnetic field in the magnetic ring, and the second loop is used to generate different feedback currents according to the change of the magnetic field; The giant magnetoresistance sensor comprises a plurality of layers of film materials, and each layer of film material comprises a first material and a second material; The first material comprises cobalt, iron and boron elements, and the second material comprises copper element; the proportion of the cobalt, iron and boron elements in the first material is 20%, 60% and 20% respectively; the proportion of the copper element in the second material is 100%; The corrosion sensor further comprises a controller, and the controller is used to: Obtain the current output by the corrosion sensor; Bring the current into a pre-built formula to obtain the thickness of the corrosion measurement element corroded; Determine the corrosion intensity according to the thickness; The formula is: L, a, and b are the length, width, and thickness of the metal element before corrosion, respectively; ρ is the resistivity of the metal element; R r0 The initial resistance of the metal element is R. r0 R0 is the resistance value of the first protective resistor, U0 is the output voltage of the power supply, n is the number of turns of the second wire wound on the magnetic ring, and N R The number of turns in the wire group of the magnetic ring. Indicates the current, This indicates the thickness of the corroded material.

2. The corrosion sensor of claim 1, wherein The plurality of layers of film materials comprises 20 layers.

3. A method of using a corrosion sensor, characterized by, The corrosion sensor is the corrosion sensor of any one of claims 1-2, and the application method comprises: Placing the corrosion sensor in a corrosion environment to obtain the current output by the corrosion sensor; Bringing the current into a pre-built formula to obtain the thickness of the corrosion measurement element corroded; Determine the corrosion intensity according to the thickness; The formula is: L, a, and b are the length, width, and thickness of the metal element before corrosion, respectively; ρ is the resistivity of the metal element; R r0 The initial resistance of the metal element is R. r0 R0 is the resistance value of the first protective resistor, U0 is the output voltage of the power supply, n is the number of turns of the second wire wound on the magnetic ring, and N R The number of turns in the wire group of the magnetic ring. Indicates the current, This indicates the thickness of the corroded material.

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