Electrochemical anti-corrosion device for metal

Abstract

The embodiment of the invention relates to an electrochemical anti-corrosion device for metal. The electrochemical anti-corrosion device comprises a state sensor, a DSP (Digital Signal Processor), a driving signal amplifying circuit and an RC (Resistance-Capacitance) integrating circuit, the state sensor is arranged on the surface of metal and used for detecting the state of the metal and feeding back a detection signal to the DSP processor; the DSP processor is used for evaluating the state of the metal according to the signal transmitted by the state sensor and generating a pulse signal with a corresponding pulse width according to the state of the metal; the driving signal amplification circuit is used for amplifying the pulse signal transmitted by the DSP to obtain an amplified pulse signal; and the RC integrating circuit is used for generating a sawtooth wave signal according to the amplified pulse signal. The device has the technical effects of being accurate in control, high in adaptability, energy-saving, environment-friendly, remarkable in anti-corrosion effect and the like.

Description

Technical Field

[0001] The invention relates to the technical field of metal anti-corrosion, and in particular to an electrochemical anti-corrosion device for metal. Background Art

[0002] Anti-corrosion technology is of great significance for protecting materials, extending the service life of equipment, and improving economic benefits. Especially in the industrial field, equipment corrosion is a long-standing problem. For example, in petroleum, chemical industry, electricity, etc., the corrosion problem of equipment and pipelines is particularly prominent. Metals are easily corroded by environmental factors such as oxidation and corrosion during long-term use, which leads to the degradation of material performance or even failure. The effective application of anti-corrosion technology can significantly reduce maintenance costs and improve production safety. There are many traditional anti-corrosion methods, including coating protection, adding corrosion inhibitors, electroplating, etc. Although they can delay corrosion to a certain extent, they have technical problems such as poor durability and high maintenance costs.

[0003] In recent years, electrochemical corrosion protection technology that uses current or potential difference to inhibit or slow down metal corrosion has attracted widespread attention due to its high efficiency and environmental protection. However, most existing electrochemical corrosion protection technologies use current waveforms with fixed parameters, which are difficult to accurately control for different materials and different corrosion environments, have poor adaptability, low efficiency, and limited corrosion protection effects. Summary of the invention

[0004] In view of this, the present invention proposes an electrochemical corrosion protection device for metal to solve the above technical problems.

[0005] An embodiment of the present invention proposes an electrochemical corrosion protection device for metal, comprising a state sensor, a DSP processor, a drive signal amplifying circuit and an RC integrator circuit; the state sensor is arranged on the metal surface, and is used to detect the state of the metal, and feed back the detection signal to the DSP processor; the DSP processor is used to evaluate the state of the metal according to the signal transmitted by the state sensor, and generate a pulse signal with a corresponding pulse width according to the state of the metal; the drive signal amplifying circuit is used to amplify the pulse signal transmitted by the DSP processor to obtain an amplified pulse signal; the RC integrator circuit is used to generate a sawtooth wave pulse at its output end under the drive of the amplified pulse signal.

[0006] Preferably, the anti-corrosion device also includes a transformer for changing the voltage of the AC power; and a rectifier and filter circuit for converting the AC power into the DC power and filtering the DC power.

[0007] Preferably, the state sensor is arranged on the metal surface to be treated with corrosion protection to detect the state of the metal in real time.

[0008] Preferably, the state sensor includes an electrochemical sensor and a pH sensor, the electrochemical sensor is used to detect the potential of the metal, and the pH sensor is used to detect the pH value of the metal.

[0009] Preferably, the anti-corrosion device further comprises a database module for storing status data corresponding to the status of the metal, and the DSP processor can generate a pulse signal with a corresponding pulse width according to the status of the metal detected by the status sensor and the status data.

[0010] Preferably, the DSP processor generates a pulse signal with a corresponding pulse width according to a result of comparing the state of the metal with the corresponding state data stored in the database module.

[0011] Preferably, the state of the metal is the potential of the metal, and the corresponding state data stored in the database module is the potential of the metal in a passivation zone that is not easily corroded.

[0012] Preferably, the drive signal amplifying circuit is an optocoupler isolation drive signal amplifying circuit, the output pin of the DSP processor is connected to the input end of the amplifying circuit, and the output end of the optocoupler isolator is connected to the drive circuit of the IGBT, thereby realizing the function of amplifying the output signal and isolating the drive IGBT.

[0013] Preferably, the RC integration circuit consists of an IGBT, a capacitor and two resistors.

[0014] The beneficial effects of the embodiments of the present invention are:

[0015] The electrochemical anti-corrosion device for metal in the embodiment of the present invention utilizes variable pulse width sawtooth wave generation technology to achieve metal anti-corrosion. Based on the influence of the sawtooth wave signal on the electrochemical reaction on the metal surface, a variable pulse width sawtooth wave signal is generated by a single-chip microcomputer. The signal is used as the output waveform of the power supply to perform electrochemical treatment on the metal surface. During the treatment process, the pulse width of the sawtooth wave is adjusted in real time according to the real-time detected state of the metal using data or algorithms stored in a database to achieve the best anti-corrosion effect. The device has technical effects such as precise control, strong adaptability, energy saving and environmental protection, and can effectively extend the service life of metal components. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the system structure of the electrochemical anti-corrosion device for metal in an embodiment of the present invention.

[0017] Figure 2 It is a rectifier filter circuit and an RC integration circuit for an electrochemical corrosion protection device for metal in an embodiment of the present invention.

[0018] Figure 3It is a flow chart of dynamically outputting the optimal pulse width of the electrochemical corrosion protection device for metal in an embodiment of the present invention.

[0019] Figure 4 It is a block diagram of a DSP system of an electrochemical anti-corrosion device for metals in an embodiment of the present invention.

[0020] Figure 5 It is a schematic diagram of a high-frequency signal amplification circuit for an electrochemical anti-corrosion device for metal in an embodiment of the present invention.

[0021] Figure 6 It is a sawtooth waveform used in the electrochemical corrosion protection device for metal in the embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. However, those skilled in the art will appreciate that the present invention is not limited to the accompanying drawings and the following embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments may be combined with each other without conflict.

[0023] Reference Figure 1-6 This embodiment proposes an electrochemical anti-corrosion device for metal, including a transformer, a rectifier and filter circuit, a state sensor, a DSP processor, a database module, a drive signal amplifying circuit and an RC integration circuit.

[0024] The transformer is connected to the grid to change the voltage of the alternating current.

[0025] The rectifier and filter circuit is used to convert alternating current into direct current and filter the direct current.

[0026] The state sensor is arranged on the metal surface, and is used to detect the state of the metal, and feed back the detection signal to the DSP processor.

[0027] The DSP processor is used to evaluate the state of the metal according to the signal transmitted by the state sensor, and generate a pulse signal with a corresponding pulse width according to the state of the metal.

[0028] The database module is used to store data corresponding to the state of the metal, and the DSP processor can generate a pulse signal with a corresponding pulse width according to the data.

[0029] The driving signal amplifying circuit is used to amplify the pulse signal transmitted by the DSP processor to obtain an amplified pulse signal.

[0030] The RC integrator circuit is used to generate a sawtooth wave pulse at its output end under the drive of the amplified pulse signal.

[0031] The transformer is connected to the grid power, and in one embodiment, the grid voltage is stepped down to 24V.

[0032] like Figure 2 As shown, the rectifier and filter circuit is used to convert 24V AC into DC and filter the DC to provide a stable DC voltage. In one embodiment, the rectifier and filter circuit includes a rectifier bridge and a filter capacitor. The rectifier bridge is composed of 4 diodes to complete the conversion of AC to DC. The filter capacitor is used to filter out high-frequency noise and harmonics in the circuit to provide a stable DC voltage. The rectifier and filter circuit is composed of 4 rectifier diodes D1, D2, D3, and D4 to form a bridge rectifier circuit. The rectifier diodes are such as IGBTs, and there are always two diodes in the circuit that are in a reverse biased state at the same time. Diodes D1 and D4 form a pair of bridge arms, and D2 and D3 form another pair of bridge arms. Using the unidirectional conductive characteristics of the diode, the positive half cycle and the negative half cycle of the AC signal are rectangularized respectively, and then filtered by capacitors to obtain a pure DC output. When the positive half cycle of the input AC signal is on, D1 and D4 are turned on, while D2 and D3 are turned off; when the negative half cycle of the input AC signal is on, D2 and D3 are turned on, while D1 and D4 are turned off. By alternating in this way, the conversion from AC signal to DC signal can be achieved. The pulse signal output by the DSP processor is amplified by the driving signal amplifier circuit and drives the IGBT of the RC integration circuit, and finally outputs a sawtooth wave pulse at the output end, and the output end is connected to the two ends of the metal rod so that the pulse signal acts on the metal.

[0033] The state sensor is arranged on the metal surface to be treated for corrosion protection to detect the state of the metal in real time. The state sensor preferably includes an electrochemical sensor and a pH sensor, which are used to detect the current potential distribution and pH value of the metal respectively. The state sensor transmits the detection analog signal to the DSP processor, and the DSP processor receives the detection analog signal input by the state sensor, converts the detection analog signal into a digital signal (0 or 1), and then performs calculation processing on the digital signal to evaluate the current state of the metal surface.

[0034] Potential is an important parameter to measure the degree of metal corrosion. The lower the standard electrode potential of the metal, the easier it is to be oxidized, that is, the easier it is to be corroded; on the contrary, the metal with a higher standard electrode potential is less likely to be corroded. When the sawtooth pulse current passes through the metal, due to the instantaneous change of the current, an electric field and an electromagnetic field will be generated inside the metal. The changes in these fields will affect the distribution and movement of free electrons in the metal, resulting in changes in the potential of the metal. Specifically, the positive half-cycle and negative half-cycle of the current will cause the potential of the metal to rise and fall, respectively, forming potential fluctuations. Taking metal iron as an example, the corrosion zone and passivation zone of iron can be found in the potential-pH diagram. When the potential and pH value of iron are in the corrosion zone, iron will corrode; when it is in the passivation zone, a dense oxide protective film will form on the iron surface, thereby preventing further corrosion. Furthermore, the adjustment of the sawtooth pulse width can change the charge distribution and electric field strength on the metal surface, thereby affecting the change of potential. A wider pulse width can provide a more stable current and electric field distribution. By monitoring the change of potential, the effect of the sawtooth pulse width on the corrosion tendency of the metal can be evaluated. At the same time, the change of pulse width can also affect the rate of redox reaction. In pulse discharge treatment, shorter pulse width usually leads to higher peak power and stronger ionization effect, thereby accelerating the redox reaction. Therefore, the embodiment of the present invention changes the potential distribution of the metal surface by providing a sawtooth wave pulse with a variable pulse width, so that it is in the passivation zone, thereby delaying its corrosion.

[0035] Figure 3 This is a flow chart of the electrochemical anti-corrosion device of the embodiment of the present invention maintaining the dynamic output of the optimal pulse width. The device is started, the state sensor keeps working, and the state of the metal is detected. The DSP processor obtains and processes the detection signal to obtain the state data of the metal, and compares the state data with the corresponding state data pre-stored in the database module. In one embodiment, the corresponding state data pre-stored in the database module is the potential of the metal in the passivation zone that is not easily corroded. Therefore, the current metal surface potential detected by the sensor is compared with the potential of the metal in the passivation zone that is not easily corroded in the database. The DSP processor generates a pulse signal of a corresponding pulse width corresponding to the state of the metal according to the comparison result, that is, the DSP processor can generate a pulse signal of a corresponding pulse width according to the data stored in the database module, obtain the optimal pulse width suitable for processing the metal surface, and then output the pulse signal of the pulse width to the driving signal amplification circuit. Therefore, the DSP processor can dynamically output a pulse signal of the optimal pulse width matching the state of the metal, and realize the process of changing the pulse width of the sawtooth wave in real time according to the state data of the metal, and realizing the process of changing the pulse width.

[0036] like Figure 4As shown, the DSP processor includes a chip, a clock circuit, a memory and a key module. The DSP processor receives and processes the signal transmitted by the state sensor, obtains the state of the metal, and then adjusts the pulse width of the pulse signal according to the result of comparing the state of the metal with the data stored in the database module, thereby generating a pulse signal with a corresponding pulse width according to the state of the metal, and inputting the pulse signal into the drive signal amplification circuit. The clock circuit provides an accurate clock signal to ensure the stable operation of the DSP processor, and the memory is used to store program code and related data for the DSP processor to perform calculation and control operations.

[0037] The driving signal amplifying circuit amplifies the pulse signal output by the DSP processor. Figure 5 As shown, the pulse signal output by the DSP processor is input into the drive signal amplifying circuit. In one embodiment, the drive signal amplifying circuit is based on an optocoupler isolation chip. The output pin of the DSP processor is connected to the input end of the amplifying circuit, and the output end of the optocoupler isolator is connected to the drive circuit of the IGBT, thereby realizing the functions of amplifying the output signal and isolating and driving the IGBT. The pulse signal with a suitable pulse width is amplified to drive the switch tube in the RC integrator circuit, and then integrated to obtain the required sawtooth waveform. Specifically, the principle of the drive signal amplifying circuit is as follows: Figure 5 As shown, the optocoupler chip TLP250 electrically isolates the control circuit from the IGBT drive circuit. The PWM signal of the control circuit passes through the resistor R a Connect to the 2nd pin of the chip, the 3rd pin is connected to the ground potential of the control circuit, the 5th and 8th pins are connected to the -15V and +18V generated by the three-terminal regulator respectively, and the 6th and 7th pins are directly short-circuited. 1 With Q 2 To form a push-pull circuit, the bases of the two components are connected through resistor R b Connected to pin 6 of TLP250.

[0038] When the circuit is working normally, when the PWM signal input by the control circuit is at a high level, the light emitting diode inside the optocoupler is powered on and emits light, and the corresponding integrated light detector detects the light signal, so that the 6th pin of TLP250 outputs +18V. At this time, Q 1 On, Q 2 Turn off, so that the IGBT drive output is a positive voltage. On the contrary, when the PWM signal input to the control circuit is low, the light emitting diode inside the optocoupler will not emit light, and the corresponding integrated light detector will not detect the light signal, so that the 6th foot of TLP250 outputs -15V. At this time, Q 1 Shutdown, Q 2 The G and E terminals output the amplified signal and drive the IGBT in the RC circuit.

[0039] The RC integrator circuit is as follows Figure 2 As shown: It consists of an IGBT and a capacitor C 2 , two resistors R 1 , R 2 The input signal transmitted by the self-driven signal amplifier circuit is connected to one port of the capacitor through the resistor. The input signal undergoes the charging and discharging process of the capacitor, and the voltage signal is superimposed and accumulated on the capacitor, thereby realizing the integration function. The RC integration circuit has different response characteristics to signals of different frequencies. Low-frequency signals are more easily integrated, while high-frequency signals are attenuated by the charging and discharging of the capacitor. By using the characteristics of the integration circuit that during the high level period, the capacitor is charged and the voltage gradually increases; during the low level period, the capacitor is discharged and the voltage gradually decreases, a gradually increasing or gradually decreasing sawtooth wave pulse signal can be obtained.

[0040] In a specific embodiment, the sawtooth wave anti-corrosion device with a variable pulse width according to the embodiment of the present invention can be used to perform anti-corrosion treatment on the surface of an oil pipeline. By adjusting the waveform, frequency, pulse width and other parameters of the sawtooth wave, the surface of the pipeline is accurately electrochemically treated to change the electrochemical properties of the surface and form a dense protective film. This protective film can further improve the adhesion and corrosion resistance of the coating, thereby extending the service life of the oil pipeline.

[0041] The electrochemical anti-corrosion device for metals according to the embodiment of the present invention performs electrochemical treatment on the metal surface by generating a sawtooth wave current with a variable pulse width. The sawtooth wave signal is a special electrical signal waveform characterized by a fast rise and fall speed, which enables the signal to quickly respond to electrochemical changes on the metal surface. When this signal acts on the metal surface, it can change the potential of the metal surface, thereby affecting the kinetic process of the corrosion reaction. By adjusting the pulse width of the sawtooth wave, the rate and direction of the electrochemical reaction on the metal surface can be controlled. During the corrosion process, the redox reaction on the metal surface will be affected by the change in potential. When the pulse width of the sawtooth wave signal is appropriate, it can form a protective film on the metal surface to prevent the corrosive medium from directly contacting the metal, thereby reducing the corrosion rate.

[0042] The above is an explanation of the embodiments of the present invention. However, the present invention is not limited to the above embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electrochemical anti-corrosion device for metal, characterized in that: It includes a state sensor, a DSP processor, a drive signal amplifying circuit and an RC integrating circuit; The state sensor is arranged on the metal surface, and is used to detect the state of the metal, and feed back the detection signal to the DSP processor; The DSP processor is used to evaluate the state of the metal according to the signal transmitted by the state sensor, and generate a pulse signal with a corresponding pulse width according to the state of the metal; The driving signal amplifying circuit is used to amplify the pulse signal transmitted by the DSP processor to obtain an amplified pulse signal; The RC integrator circuit is used to generate a sawtooth wave pulse at its output end under the drive of the amplified pulse signal.

2. The anti-corrosion device according to claim 1, characterized in that: The anti-corrosion device also includes a transformer for changing the voltage of the alternating current; and a rectifying and filtering circuit for converting the alternating current into direct current and filtering the direct current.

3. The anti-corrosion device according to claim 1, characterized in that: The state sensor is arranged on the metal surface to be treated with anti-corrosion to detect the state of the metal in real time.

4. The state sensor according to claim 3, characterized in that: The state sensor includes an electrochemical sensor and a pH sensor. The electrochemical sensor is used to detect the potential of the metal, and the pH sensor is used to detect the pH value of the metal.

5. The anti-corrosion device according to claim 1, characterized in that: The anti-corrosion device also includes a database module for storing status data corresponding to the status of the metal. The DSP processor can generate a pulse signal with a corresponding pulse width according to the status of the metal detected by the status sensor and the status data.

6. The anti-corrosion device according to claim 5, characterized in that: The DSP processor generates a pulse signal with a corresponding pulse width according to the result of comparing the state of the metal with the corresponding state data stored in the database module.

7. The anti-corrosion device according to claim 6, characterized in that: The state of the metal is the potential of the metal, and the corresponding state data stored in the database module is the potential of the metal in the passivation zone where it is not easily corroded.

8. The anti-corrosion device according to claim 1, characterized in that: The drive signal amplifier circuit is an optocoupler isolation drive signal amplifier circuit, the output pin of the DSP processor is connected to the amplifier circuit input, and the output end of the optocoupler isolator is connected to the IGBT drive circuit, thereby realizing the function of amplifying the output signal and isolating the drive IGBT.

9. The RC integrator circuit according to claim 1, wherein: The RC integration circuit is composed of an IGBT, a capacitor and two resistors.

Images