A metal member rust detection device and a detection method

Abstract

The application discloses a kind of metal member rust detection device and detection method, the device includes: vibration pulse generating mechanism, for providing different frequency vibration pulse signal source;Two piezoelectric ceramic sheets, the two piezoelectric ceramic sheets are closely pasted to the metal member to be measured and are connected with wire, wherein one piezoelectric ceramic sheet is arranged between vibration pulse signal source and rust, for recording initial pulse signal, another piezoelectric ceramic sheet is arranged on the side away from rust and vibration pulse signal source, for recording the pulse signal after passing through rust area.The device records the initial vibration pulse signal of the metal member to be measured and the vibration pulse signal through the rust part by two piezoelectric ceramic sheets, and by changing the frequency of vibration pulse signal, the rust damage of metal member can be measured quickly and accurately, and the structure is simple and convenient to operate.

Description

Technical Field

[0001] This invention relates to the field of metal component corrosion detection technology, specifically to a metal component corrosion detection device and detection method. Background Technology

[0002] Currently, in laboratories, Faraday's formula is used to control the current intensity to alter the corrosion rate of metal components such as studs. However, the actual corrosion rate is affected by both the current intensity and the experimental conditions, leading to a significant discrepancy between the theoretically derived corrosion rate and the actual rate. To ensure the accuracy of stud corrosion rate measurement, it is necessary to perform acid pickling and rust removal followed by weighing or three-dimensional laser scanning to obtain the actual corrosion rate. However, these techniques suffer from drawbacks such as a lack of theoretical model support, cumbersome operation procedures, low accuracy of results, and relatively expensive instruments. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a device and method for detecting corrosion of metal components.

[0004] The technical solution provided by this invention is as follows:

[0005] A metal component corrosion detection device, comprising:

[0006] Vibration pulse generator, used to provide vibration pulse signal sources of different frequencies;

[0007] Two piezoelectric ceramic plates are tightly bonded to the metal component under test and connected by wires. One piezoelectric ceramic plate is placed between the vibration pulse signal source and the rust to record the initial pulse signal, and the other piezoelectric ceramic plate is placed on the side away from the rust and the vibration pulse signal source to record the pulse signal after passing through the rust area.

[0008] It also includes clamps, which are located on both sides of the metal component to be tested and are used to clamp the metal component to be tested.

[0009] The vibration pulse generating mechanism includes a base, on which an elastic rod is provided, and on the top of the elastic rod is a solid metal ball.

[0010] The lower end of the elastic rod is provided with a locking tenon for adjusting the length of the elastic rod.

[0011] The elastic rod is marked with graduations.

[0012] The elastic rod has a rectangular cross-section, and its length perpendicular to the plane of motion is greater than its length parallel to the plane of motion.

[0013] The elastic rod is made of rubber.

[0014] A method for detecting corrosion of metal components includes the following steps:

[0015] Step 1: Firmly attach two piezoelectric ceramic sheets to the metal component to be tested and connect them with wires, with the two piezoelectric ceramic sheets placed on opposite sides of the corroded part;

[0016] Step 2: Apply a vibration pulse of a fixed frequency to one side of the metal component to be tested, and record the signal intensity of the two piezoelectric ceramic plates;

[0017] Step 3: Gradually increase the frequency of the vibration pulse. When the signal intensity attenuation rate of the two piezoelectric ceramic plates is lower than the attenuation rate when the metal component under test is free of rust, record the vibration pulse period at this time. Calculate the transmission speed of the vibration inside the metal component by using the phase difference between the signals collected by the two piezoelectric ceramic plates, and calculate the length of the rusted area.

[0018] The beneficial effects of this invention are as follows: This invention records the initial vibration pulse signal passing through the metal component under test and the vibration pulse signal passing through the rusted part using two piezoelectric ceramic plates. By changing the frequency of the vibration pulse signal, it can achieve rapid and accurate measurement of the rust damage of the metal component. The structure is simple and the operation is convenient. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention.

[0020] Figure 2 This is a cross-sectional view of the elastic rod according to an embodiment of the present invention. Detailed Implementation

[0021] As shown in the figure, a metal component corrosion detection device includes: a vibration pulse generating mechanism for providing vibration pulse signal sources of different frequencies; and two piezoelectric ceramic plates, which are tightly bonded to the metal component 6 to be tested and connected by wires. One piezoelectric ceramic plate 8-1 is located between the vibration pulse signal source and the rust, for recording the initial pulse signal, and the other piezoelectric ceramic plate 8-2 is located on the side away from the rust and the vibration pulse signal source, for recording the pulse signal after passing through the rusted area. The piezoelectric ceramic plates can be used as vibration sensors to acquire vibration signals inside the structure and obtain monitoring signals related to the structural performance. This signal serves as a benchmark, and changes in the signal are observed to identify whether the structure has rusted. In reality, the main component of rust is loose and porous iron oxide. When the vibration signal is transmitted to the rust location, it will change, especially the high-frequency signal. The energy dissipation in the rusted area is significantly higher than that of the low-frequency signal. Due to its high-frequency characteristics, it is sensitive to early rust damage of the structure. As a vibration signal sensor, it can help measure the corrosion rate of metal components.

[0022] This embodiment also includes a clamp 7, which is disposed on both sides of the metal component 6 to be tested, and is used to clamp the metal component 6 to be tested, so as to prevent the metal component 6 from sliding under the action of vibration pulse and affecting the experimental results.

[0023] In this embodiment, the vibration pulse generating mechanism includes a base 5, on which an elastic rod 3 is provided. The elastic rod 3 is made of rubber, and a solid metal ball 1 is provided at the top of the elastic rod 3. The solid metal ball 1 is released at the initial position 2 of simple harmonic motion, and the ball revolves around the equilibrium position, striking one side of the metal component 6 to be tested at a certain frequency, generating a pulse signal with a fixed frequency. The lower end of the elastic rod 3 is provided with a latch 4 for adjusting the length of the elastic rod 3. The elastic rod 3 is marked with graduations. To obtain pulse signal sources of different frequencies, the length of the elastic rod 3 is changed. The length is adjusted according to the graduations on the elastic rod 3, and the bottom end of the elastic rod 3 is fixed by the latch 4. As the length of the elastic rod 3 decreases, the period of the vibration pulse decreases, and the corresponding frequency increases.

[0024] In this embodiment, the cross-section of the elastic rod 3 is rectangular, and its length h perpendicular to the plane of motion is greater than its length b parallel to the plane of motion. This prevents the solid metal ball from exhibiting a velocity component perpendicular to the plane of the paper during simple harmonic motion, thus ensuring the accuracy of the pulse signal.

[0025] In this embodiment, a solid metal sphere is used to strike a stud in simple harmonic motion to provide a pulse source, which realizes the continuous adjustment of the pulse source period. On the one hand, this is beneficial for variable control in the experiment, and on the other hand, it reduces the difficulty of signal processing. Other sources with controllable periods can also be used.

[0026] When using the device described in the above embodiments to detect corrosion of metal components, taking the detection of studs as an example, the following steps are included:

[0027] Step 1: Fix the stud 6 onto the clamp 7 and clamp it securely. The clamp 7 should be firmly connected to the fixed support or the ground. After connecting the piezoelectric ceramic plates 8-1 and 8-2 with the wires, glue them to both sides of the rusted part with epoxy resin. The piezoelectric ceramic plate 8-1 records the original pulse signal, and the piezoelectric ceramic plate 8-2 records the pulse signal after passing through the rusted area.

[0028] Step Two: The solid metal ball 1 at the top of the elastic rod 3 periodically impacts one side of the stud in simple harmonic motion, providing vibration pulses. The period of the vibration pulses is obtained by controlling the length l of the elastic rod 3. The lower end of the elastic rod 3 is connected to the latch 4, and there are graduations on the elastic rod 3. The pulse period is calculated according to the following formula:

[0029]

[0030] Where m represents the mass of the solid metal sphere 1, and EI represents the stiffness of the elastic rod 3;

[0031] The signal intensities P1 and P2 recorded by piezoelectric ceramic sheet 8-1 and piezoelectric ceramic sheet 8-2, respectively, were also recorded.

[0032] Step 3: Gradually decrease the length of elastic rod 3. The period of the pulse source decreases, the corresponding frequency increases, and the attenuation rate r of the signal intensity is recorded each time. L =P2 / P1, in the absence of corrosion, the attenuation rate is r0. As the frequency of the seismic source signal increases, when r first appears... L When the value is significantly lower than r0, record the source period T at this time. L Based on the phase difference between the signals collected by piezoelectric ceramic plates 8-1 and 8-2, the transmission velocity v of the vibration inside the stud is obtained, and then calculated according to the formula L = T. L v calculates the length of the corroded area, thus determining the degree of corrosion of the stud.

[0033] In this embodiment, the vibration signal and corrosion rate data obtained from repeated experiments can be imported into an artificial neural network to construct a functional relationship between the pulse signal attenuation and the corrosion rate, thereby achieving high measurement accuracy and convenient application, and providing a new method for rapid and accurate measurement of corrosion damage to metal components such as studs.

[0034] The embodiments should not be construed as limiting the present invention, and any non-creative improvements made based on the spirit of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A device for detecting corrosion of metal components, characterized in that, include: Vibration pulse generator, used to provide vibration pulse signal sources of different frequencies; Two piezoelectric ceramic plates are tightly bonded to the metal component (6) to be tested and connected by wires. One piezoelectric ceramic plate (8-1) is placed between the vibration pulse signal source and the rust to record the initial pulse signal. The other piezoelectric ceramic plate (8-2) is placed on the side away from the rust and the vibration pulse signal source to record the pulse signal after passing through the rust area. The vibration pulse generating mechanism includes a base (5), on which an elastic rod (3) is provided. A solid metal ball (1) is provided on the top of the elastic rod (3), and a latch (4) is provided at the lower end of the elastic rod (3) for adjusting the length of the elastic rod (3). The method of the metal component rust detection device for detecting metal component rust is as follows: Step 1: Firmly attach two piezoelectric ceramic sheets to the metal component to be tested and connect them with wires, with the two piezoelectric ceramic sheets placed on opposite sides of the corroded part; Step 2: Apply a vibration pulse of a fixed frequency to one side of the metal component to be tested, and record the signal intensity of the two piezoelectric ceramic plates; Step 3: Gradually increase the frequency of the vibration pulse. When the signal intensity attenuation rate of the two piezoelectric ceramic plates is lower than the attenuation rate when the metal component under test is free of rust, record the vibration pulse period at this time. Calculate the transmission speed of the vibration inside the metal component by using the phase difference between the signals collected by the two piezoelectric ceramic plates, and calculate the length of the rusted area.

2. The metal component corrosion detection device according to claim 1, characterized in that: It also includes clamps (7), which are located on both sides of the metal component to be tested and are used to clamp the metal component to be tested (6).

3. The metal component corrosion detection device according to claim 1, characterized in that: The elastic rod (3) is marked with a scale.

4. The metal component corrosion detection device according to claim 1, characterized in that: The elastic rod (3) has a rectangular cross-section, and its length perpendicular to the plane of motion is greater than its length parallel to the plane of motion.

5. The metal component corrosion detection device according to claim 1, characterized in that: The elastic rod (3) is made of rubber.

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