KR102556808B1 - Cathodic protection system and the method thereof - Google Patents

Abstract

The present invention relates to a hybrid cathodic protection system and its control method, and more particularly, in order to selectively use an external power supply type cathode protection technology and a sacrificial anode type cathodic protection technology, when a problem occurs with the currently applied anticorrosive method, other It relates to a hybrid cathodic protection system capable of applying an anticorrosion method to an anticorrosive body with almost no time delay and a control method thereof.

Description

Hybrid cathodic protection system using external power and its control method {Cathodic protection system and the method thereof}

The present invention relates to a hybrid cathodic protection system and a control method thereof, and more particularly, when a problem occurs in the currently applied anticorrosive method, an external power source can be applied to the anticorrosive body of the other method almost without a time delay. It relates to a hybrid cathodic protection system and its control method that can be applied by differentially and finely adjusting external power according to the

In general, corrosion is a phenomenon in which a material reacts with the surrounding environment and deteriorates or destroys a material due to an unintended chemical or electrochemical reaction.

Metal corrosion is a reaction that occurs at the interface between a material and a corrosive environment medium. This electrolyte/electrode interface reaction may be an electrochemical reaction (charge transfer reaction) or a mechanochemical reaction such as stress corrosion, fatigue corrosion, or friction and wear.

Corrosion due to the charge transfer reaction is caused by an electrochemical reaction, that is, a reaction involving the movement of electrons, in which electrons freely moving in the metal come into contact with an electrolyte. , occurs when the four elements of the ion path (electrolyte) are satisfied.

Here, the anode is the pole where the oxidation reaction that loses electrons takes place, and the cathode means the pole where the reduction reaction takes place by receiving electrons.

As the metal structure is corroded, it becomes a corrosive battery state, a corrosion potential is generated, and a certain corrosive current flows into the metal.

The current generated at this time is called a galvanic current or a corrosion current, and a combination of the above four elements is called a corrosion battery or a galvanic cell.

Since the oxidation reaction takes place at the anode of this battery, corrosion occurs at the anode.

If two metals of different types immersed in an electrolyte such as seawater are connected with a wire, one becomes the anode and the other becomes the cathode. It is called electrochemical series or electromotive force series (EMF series).

Electrode potential is the relative comparison of the potential of the electrochemical series of each material with the standard electrode potential in which the hydrogen reduction potential is set at 0V.

This potential is an inherent property of the material and changes according to the conditions of the electrolyte. The lower the electrode potential, that is, the easier it is to lose electrons. Among the two materials, the material with the lower electrode potential becomes the anode, causing oxidation and corrosion, and the material with the higher potential becomes the cathode, resulting in reduction and corrosion.

For example, considering iron (Fe) and zinc (Zn) submerged in seawater as an electrolyte, the electrochemical potentials are -0.45 ~ 0.65 V and -1.0 V, respectively, so zinc with a low potential becomes the anode where the oxidation reaction occurs, and iron is the cathode. becomes

In actual situations, soil also serves as an electrolyte with high specific resistance, so metal structures such as gas pipes and water pipes made of reinforced concrete or metal installed in soil or underwater become a corrosion battery state and generate a corrosion current, and the lower potential is the anode. become corroded

In this case, corrosion occurs at the point where current leaks out from the metal surface through the electrolyte. Therefore, corrosion can be detected by measuring the natural potential with respect to the reference electrode of the metal structure, which is a corrosion inspection target.

On the other hand, since corrosion is a natural phenomenon that tends to descend from a higher energy level to a more stable lower energy level, corrosion cannot be prevented forever, but it can be slowed down.

In general, corrosion prevention (防蝕) is achieved by artificially removing or suppressing the four elements that cause the corrosion current, and in general, in the field of corrosion prevention, corrosion inhibitors, insulating plates or other methods are used to suppress anode or cathode reactions, or electronic Alternatively, a method of blocking the flow of ions is being taken.

Metal structures in which corrosion is a problem in real life include concrete-related structures such as coastal piers, piers and bridges, reinforced concrete, and devices or structures directly exposed to corrosive environments such as steel bridges or steel structures.

Corrosion of metal structures is caused by anodic and cathodic reactions in electrolytes such as soil or seawater, so corrosion is prevented by blocking the surface of the metal structure from the electrolyte, separating the anode and cathode parts, or inhibiting the progress of the anodic reaction. It becomes the basic way to do it.

Among the methods of blocking the above four elements, as a method of blocking contact with the electrolyte, reinforced concrete structures such as polyethylene are coated with synthetic resin, and are currently widely used, but various improvements are required. Separation of the anode and the cathode is very difficult in practice, so it is rarely used in practice.

In general, the externally powered cathodic protection method uses a cathodic protection system including a power supply, a rectifier and an anode, and applies the power converted from alternating current to direct current by the rectifier to an insoluble anode installed in a concrete structure to generate an anticorrosion current. and protects the reinforcing bar, which is the cathode in the concrete structure, by the anticorrosion current.

In addition, the sacrificial anode cathodic protection method uses a metal that is more corrosive than the reinforcing bars in the concrete structure as a sacrificial anode to protect the reinforcing bars in the concrete structure from corrosion.

Taking the above-mentioned reinforcing bar and copper sulfate reference electrode as an example, the -0.85 V type reference potential, but if the measured potential is lower than -2.5 V, it becomes a serious overcorrosion state, resulting in not only corrosion but also hydrogen embrittlement, which has a serious adverse effect on the coated body. do.

In addition, when power is lost due to natural factors such as lightning in summer, it is in an uncorroded state and the coated body is easily corroded.

Corrosion by this method is especially serious for steel structures where rebars are exposed to seawater, which is an electrolyte, and suffers serious damage even if the method is not used for a short time.

However, since the potential of the anode is adjusted if necessary through an external power supply device, the anticorrosion efficiency can be increased.

In the sacrificial anode method, the conductor part is not physically disconnected, and the anticorrosion current always flows, but the current control is very difficult, and the anticorrosive effect range is narrow and the anticorrosion current is small in a place with high specific resistance, so it is inefficient.

In the case of the external power supply method, if the design and construction are done, the reliability is higher and the lifespan is longer than the sacrificial anode method.

However, as the problem of interference with other facilities due to stray current generated when external power is applied becomes serious, the application of the external power method is gradually being reduced.

The sacrificial anode method has a low interference effect on other facilities and requires low maintenance during the design life span. However, unlike the design, when maintenance is required or the life span of the consumable sacrificial anode is over, it is inconvenient to have to reconstruct on roads or railroads, and traffic is complicated. Covering roads in the region is increasingly difficult due to the negative impact on human life.

Recently, technologies that combine the advantages of the two methods and use them for corrosion protection have been filed in order to cope with the above-mentioned difference in corrosion by breaking away from the conventional technology of performing electrical method by selecting only one of the sacrificial anode method or the external power method. It was a form of simply applying these two methods in parallel.

In conclusion, the hybrid method mentioned above has the disadvantage that it cannot overcome the difference in corrosion current due to the location of the coated body and partial environment, and the environmental change according to the season or situation, although there are some technological advances. there is.

In addition, sacrificial anodes currently used commercially contain heavy metals such as indium (In), cadmium (Cd), and lead (Pb) to increase efficiency.

However, since these heavy metals are designated as harmful substances and adversely affect the human body and the environment, their use is gradually being regulated, especially in developed countries.

In order to overcome this point, it is required to develop a high-efficiency sacrificial anode having an electrochemically low corrosion potential by adding microelements having little environmental impact.

Korean Patent Publication No. 2017-0104317 Korean Patent Publication No. 2012-0077999 Korean Patent Publication No. 2016-0041365

The present invention was made to solve the above problems, and a system combining a sacrificial anode type cathodic protection method and an external power supply type cathodic protection method is installed in the same area to be protected from corrosion, and the efficiency of the method made by the sacrificial anode is determined. If this is not done enough, the main purpose is to provide a hybrid cathodic protection system that is temporarily replaced by an external power supply.

In addition, a main object of the present invention is to provide a sacrificial anode made of a highly efficient material.

In order to solve the above problems, the present invention provides an anode unit including at least one sacrificial anode or an insoluble anode; A reference electrode providing a reference potential when measuring potential; An external power supply unit connected to a power source supplied from the outside and supplying direct current to the electric protection system; And the current between the sacrificial anode and the coated object in the anode part and the method voltage applied between the coated object and the reference electrode are measured and compared with the reference voltage, and when the method voltage is higher than the reference voltage, the sacrificial anode and the It includes; a controller that blocks the connection between the bodies.

In addition, the present invention is an anode portion comprising at least one or more sacrificial anodes or insoluble anodes; A reference electrode providing a reference potential when measuring potential; A method using a hybrid cathodic protection system comprising an external power supply unit connected to a power supply supplied from the outside and supplying direct current to an electric protection system, wherein the control unit controls the current between the sacrificial anode in the anode unit and the and measuring a method voltage applied between the subject and the reference electrode, comparing the method with the reference voltage, and cutting off the connection between the sacrificial anode and the subject when the method voltage is higher than the reference voltage.

The present invention made as described above can apply external power to the corrosion protection body with almost no time delay when there is a problem with the currently applied corrosion protection method, and in some cases, the external power source can be applied by differentially and finely adjusting it. It can also be improved by observing the exterior from the outside to create learning data.

In addition, the present invention can solve the problem of corrosion prevention methods using the conventional sacrificial anode method, which has a concern that corrosion occurs in the reinforcement of the pier due to missing the replenishment period of the anode.

In addition, according to the present invention, there is an effect that can manufacture a module for a hybrid method system.

In addition, the present invention can overcome the difference in corrosion current due to the location of the coated body, the partial environmental difference, and the environmental change according to the season or situation.

1 is a diagram showing a schematic configuration of a hybrid cathodic protection system using an external power source according to the present invention.
2 is a view showing a specific configuration of a hybrid cathodic protection system using an external power source according to the present invention.
3 is a scanning photograph of Al as a sacrificial anode according to an embodiment of the present invention.
Figure 4 is a comparison of how high the effective capacity (effective capacity) of the Zn-Sn alloy compared to the actual pure Zn.
5 is a view showing a change in the natural potential of a zinc alloy over time.

In order to fully understand the present invention, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be construed as being limited to the examples described in detail below. This embodiment is provided to more completely explain the present invention to those skilled in the art. Therefore, the shapes of elements in the drawings may be exaggerated to emphasize a clearer description. It should be noted that in each drawing, the same members are sometimes indicated by the same reference numerals. In addition, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention are omitted.

Hereinafter, as shown in FIG. 1, the present invention will be described in detail through exemplary drawings.

The hybrid anode method pursued by the present invention combines common elements of the sacrificial anode method shown in FIG. 1 (a) and the external power source method shown in FIG. One of the two corrosion protection methods is selectively applied to suit the situation of each corrosive environment while minimizing it, and if a problem occurs with the currently applied method, the other method is applied to the corrosion protection body with almost no time delay to prevent corrosion. There is a main purpose.

A description of FIGS. 1(a) and 1(b) for clarifying the concept of the present invention is as follows.

Figure 1 (a) illustrates the basic sacrificial anode method, and the sacrificial anode made of materials such as Al, Mg, Zn, etc. in an electrolyte such as seawater (not shown) and the coated body, which is a metal structure such as reinforcing bar, are connected by a conductive wire. are electrically connected.

The sacrificial anode is in an electrolyte such as seawater or soil, and the reinforcing bar exists within a distance enough for current to flow.

When measuring the potential applied to the corroded body to check the corrosion protection, the potential difference between the corroded bodies is measured with an electrometer using the reference electrode as the + pole instead of the sacrificial anode as shown in Fig. 1 (a).

In addition, in order to measure the corrosion current flowing in the coated body, the current flowing in the conductor connecting the sacrificial anode and the coated body is measured with an ammeter.

As shown in Fig. 1 (a), in an actual situation, the potential and current are measured in a test box to facilitate measurement.

1(b) illustrates the external power method, and the anode of the DC power source is electrically connected to the insoluble anode and the cathode of the DC power source is electrically connected to the coated body, thereby constituting a basic external power method.

In FIG. 1(b), as in the description of FIG. 1(a), the reference electrode does not always need to be connected to the DC power supply unit, and can be connected under control to measure voltage and current.

The DC power supply unit has the function of connecting direct current coming from the outside to the + and - poles and, if necessary, the function of electrically connecting the insoluble anode, the coated body, and the reference electrode using relays installed in the DC power unit, as shown in Figure 1 (a ), the voltage and current are measured using a voltmeter and an ammeter, and in an actual situation, the potential and current are measured in a separately installed test box as described above to facilitate measurement.

Comparing FIGS. 1(a) and 1(b), it can be seen that the sacrificial anode acting as an anode and the insoluble anode are different from each other, and the DC power supply unit is only present in FIG. 1(b).

On the other hand, FIG. 1(c) shows a hybrid type anticorrosive system, which is an embodiment of the present invention combining the elements of FIGS. 1(a) and 1(b).

In FIG. 1(c), an external power supply unit 140 replacing the function of the DC power supply unit in FIG. 1(b) and a control unit 150 connected to and controlling the main elements of the system are shown.

1(d) shows the anode part 190 having a function of connecting one end of the sacrificial anode and the insoluble anode to each independent terminal and selecting one of the two terminals by control and connecting it to the controller 150. .

The anode unit 190 includes terminals 101 and 102, a non-conductive substrate 103 and a relay 104, and the sacrificial anode 100 and the insoluble anode ( 110) are connected to each other, and one of the two terminals is selected by the relay 104 and connected to the control unit 150.

Figure 1 (e) shows the modules constituting the control unit 150, the description is as follows.

The control unit 150 is a part in charge of the control function of the embodiment of the hybrid method system of FIG. and consists of

The electrode module 151 is a part that selectively connects the sacrificial anode 100, the insoluble anode 110, the coated portion 130, and the reference electrode 120 in the anode portion 190, and has at least one -terminal. The coated portion 130, the anode part 190 to at least one + terminal of the control module 153, and the reference electrode 120 to a separate + terminal are respectively connected.

The potential current measurement module 152 serves to measure the potential and current generated by the electrical connection of the electrode module 151 and deliver the result to the control module 153.

The power module 154 serves to electrically connect the external power supply unit 140 and the control unit 150 to supply electrical energy necessary for operating the anticorrosive system.

The control module 153 is electrically connected to the aforementioned electrode module 151, potential current measurement module 152, and power module 154, controls the operation of these modules, and also performs a function of comparing signals with reference values and making decisions. do.

The control unit 150 selects one of the sacrificial anode 100 and the insoluble anode 110 of the anode unit 190 through the electrode module 151 to connect the corrosion-resistant unit 130 and the external power supply unit 140. do In addition, when measuring the method voltage through the electrode module 154, it also serves to connect the reference electrode 120 and the coated portion 130.

Alternatively, the control unit 150 can predict the lifespan according to the shape change according to the voltage and current of each anode part through the image information and the voltage and current signals of the potential current measuring module. If the change rate of the shape according to the increase in voltage and current of each anode is less than the reference value, it can be predicted that the life is higher than the reference life.

In particular, the control unit 150 may analyze the state of the system based on the previously learned database, correct the predicted lifespan according to the analyzed state of the system, and output a comprehensive lifespan prediction value.

In addition, the control unit 150 is connected to the external power supply unit 140 and has a function of receiving electrical energy.

The function of the control unit 150 also includes a function of measuring the potential and current between the above-mentioned electrodes and the coated object and connecting the electrodes to an external power source.

Therefore, since the functions of the electrometer and the ammeter are performed by the control unit 150, a separate device is not required.

Here, when the sacrificial anode 100 of the anode part 190 and the coated part 130 are connected by the controller 150, the sacrificial anode method is used. If the coated body 130 is connected to the + pole of (140) to the - pole of the external power supply unit 140, it becomes an external power method.

An example of a control method for converting a sacrificial anode method to an external power supply method according to a preferred embodiment of the present invention is shown in FIG. 2(a).

Referring to FIG. 2 (a), the control method for converting the sacrificial anode method to the external power method according to the present invention will be described. The current between the sacrificial anode 100 of the anode part 190 and the coated object 130 and the voltage between the reference electrode 120 and the coated object 130 are measured by the potential current measuring module 230 of the controller 150 Measured in (S400). In general, since the measurement result is an analog value, it is converted into a digital value.

At this time, when the measured value is single or multiple, the average of all the values or the average of the values excluding the minimum and maximum values is compared with the input reference value. In addition, only measured values within a preset range may be averaged and compared with a reference value.

The above methods are not limited and the average value can be calculated in various other ways.

The frequency of this operation can be set arbitrarily, and it is desirable to consider the situation of the coated object and the situation of electric energy.

The control module 153 included in the controller 150 performs an operation of comparing each input measurement value with a reference value input in advance or a reference value input according to circumstances from the outside (S410).

If it is determined that the degree of corrosion protection by the sacrificial anode method is good according to the comparison, the corrosion control by the existing sacrificial anode method is maintained (S420).

If it is determined that the degree of corrosion protection by the sacrificial anode method is poor according to the above comparison, the connection between the sacrificial anode 100 and the coated body 130 is blocked (S440).

In addition, the measured values and comparison results used in step S410 are sent to the data storage device to be used for later analysis (S430).

At the same time as shutting off, the + terminal of the external power source 140 is connected to the insoluble anode 110 of the anode part 190, and the - terminal of the external power source 140 is connected to the coated body 130, and current is applied (S450 ).

In addition, at the same time as the blocking, the comparison result and the measured value of step S410 are notified to the manager or management institution via wire or wireless to request inspection related to the sacrificial anode 100 (S460).

This control process ends after the decision to maintain the sacrificial anode (S420) or the decision to turn on the external power source (S450) is carried out.

The execution cycle of this control process can be appropriately adjusted according to the degree of supply of electrical energy and the degree of change in environmental factors.

Alternatively, the control process may be executed at any time by a command input from the outside. The latter can be usefully used when checking the anticorrosive system at the site where the anticorrosive system is in operation.

When the controller 150 measures the potential current (S410), the measurement result is generally converted into a digital value because it is an analog value.

At this time, when the measured value is single or multiple, the average of all the values or the average of the values excluding the minimum and maximum values is compared with the input reference value.

In addition, the average value may be calculated in various ways, such as obtaining an average value of only measured values within a preset range and comparing the average value with a reference value.

The frequency of performing these operations can be arbitrarily set, and it is desirable to consider the situation of the coated object and the situation of electric energy.

The reference value compared with the measured value is the corrosion reference potential, and as described above, for the steel bar and copper sulfate reference electrode, for example, it is -0.85 V.

If the measured value is greater than this value, it means that the method is insufficient, so the sacrificial anode is cut off and an external power source is connected.

In addition, since the method reference potential, which is a reference value, may change depending on circumstances, it may be externally adjusted for accurate comparison.

In general, if the current is very weak or does not flow when measuring the current, it is highly likely that the anode and the coated body are disconnected, so it is necessary to check the corrosion protection system.

When the sacrificial anode method is used, it is very likely that the line connecting the sacrificial anode and the coated body is aged or broken by external force, and when the external power method is applied, it is highly likely that the device part is destroyed by lightning.

When the command to cut off the sacrificial anode of the anode unit 190 (S440) is executed, the external power is supplied by the control system 200, and replacement is performed using the external power method.

This replacement information can be transmitted by wire or wireless to the person concerned to take follow-up measures, such as checking and repairing the sacrificial anode system.

While corrosion is inhibited by the external power method, the sacrificial anode is repaired so that a normal sacrificial anode method is achieved, and then the sacrificial anode method is switched again.

Alternatively, if the sacrificial anode method requires a lot of current that is difficult to handle, the external power source method can be maintained to cope with it.

By saving measurement results and action records in internal or external devices and using them for later analysis, it can help predict changes in corrosion rates or repair, reinforcement, and replacement times of corrosion protection systems due to environmental changes.

The longer the transition period from the sacrificial anode method to the external power method increases the corrosion of the coated body.

In particular, exposed steel bars among facilities in direct contact with seawater, such as on the coast or in the sea, do not become anticorrosive, and even if the condition lasts for several hours, a significant level of corrosion proceeds. crazy

2(b) is a preferred embodiment of the present invention including a communication unit 160, a sensor unit 170, or a display unit 180 in the hybrid method system, which is an embodiment of the present invention shown in FIG. 1(c). am.

The embodiment presented in Figure 2 (b) includes a sensor unit 170, which includes a function of detecting corrosive environmental elements and transmitting them to the control system 200, and a communication function between an external server or storage device and the control system. It is a conceptual diagram of a hybrid method system including a communication unit 160 and a display unit 180 that is attached to a device and can be checked in the field.

The display unit 180 includes one or more display devices and includes a function of outputting at least one of a signal input to the control system 200 and a signal produced by the control system 200 and making a sound.

This function can help to notify people on the site where the hybrid method system is installed about the method status and environment.

The control system 200 receiving power from the external power supply unit 140 determines whether the method by the sacrificial anode method is appropriate by measuring the method voltage and method current, and if an inappropriate judgment is made, the control system 200 switches to the external power source method and measures the method. The result and judgment may be transmitted to the outside through the communication unit 160 to proceed with additional work.

In addition, the control system 200 may adjust the amount of current scheme according to a signal input from the outside through the communication unit 160 .

In addition, the sacrificial anode is repaired while corrosion is suppressed by the external power supply method so that a normal sacrificial anode method is performed, and then the sacrificial anode method is switched again.

Alternatively, if a large amount of current is required, which is difficult to handle with the sacrificial anode method, the external power source method may be maintained.

It should be noted here that the communication unit 160, the sensor unit 170, and the display unit 180 added to the embodiment shown in FIG. 2 (b) in one embodiment of the present invention shown in FIG. , and at least one or more of the additional parts are added to constitute the embodiment of FIG. 2 (b), and although not limited thereto and not shown in the embodiment, the function can be performed in various ways by those skilled in the art. It is clear that it can be added.

The purpose of the hybrid anticorrosion system pursued by the present invention is to select and use a locally appropriate corrosion protection method for effective protection of reinforced concrete structures or reinforcing steel structures placed in a corrosive environment different from the installation or a locally diverse corrosive environment from the beginning. there is.

The power required for the method is direct current, but since most of the external power supplied by the power company is alternating current, a rectifier is needed to convert alternating current to direct current.

Therefore, in the external power method, many existing prior art have used a commutator. However, the method of receiving direct current from the beginning has also recently begun to be used.

A representative direct current power source is a solar photovoltaic cell, which is increasingly being used in an external power method. For this reason, in the present invention, the commutator is not indicated and only the external power supply unit 140 is indicated.

The advantages of the photovoltaic cell are many, and a device for storing electrical energy generated by photovoltaic power generation can be added to the external power supply unit 140 for local power supply.

In addition, a large-capacity battery may be used as the external power supply unit 140, and there may be various methods that a person with ordinary electrical knowledge can understand and modify.

Figure 2 (c) is a block diagram showing the detailed configuration of the control system 200 according to the preferred embodiment of the present invention shown in Figure 2 (b).

The method control system 200 according to a preferred embodiment of the present invention posted in FIG. 2 (b) includes an electrode module 310, a storage module 320, a potential current measurement module 330, a power module 340, and a control module. 153, a communication module 360, a sensor module 370, a display module 380 and an input/output module 390.

First, the electrode module 300 is electrically connected to the anode part 190, the reference electrode 120, and the coated body 130, respectively, as illustrated in FIG. 2 (b), and the control module 153 It includes a plurality of relays and switches for connecting the sacrificial anode 100, the insoluble anode 110, the coated body 130, and the reference electrode 120 to each other under control.

The storage module 320 functions to store data sent from the input/output module 390, and the power module 340 is electrically connected to the control module 153 and receives DC power to supply and control DC required for the method. It includes the function of supplying the electric energy required for the operation of the system and the entire system, and has a structure that can respond to electric shocks such as lightning strikes.

The communication module 360 performs a function of transmitting a signal of the input/output module 390 to the outside and a function of transmitting an external signal to the input/output module 390.

As a preferred example of the communication module 360, a low power wide area network (LoRa) communication method suitable for a situation in which electricity consumption is low and data transmission amount is not high may be selected, but is not limited thereto.

The sensor module 370 includes a plurality of sensors and is connected to the control module 153, and transmits physical, mechanical, and chemical signals such as temperature, humidity, PH, wind speed, and vibration, which are environmental variables related to corrosion, to the control module ( 153), and detects environmental variables by sensors with single or multiple functions.

The information collected by the sensor module 370 may be analyzed by the control module 153 or externally and used for efficient corrosion protection operations such as identification of corrosion factors and prediction of corrosion amount, but is not limited thereto.

The potential current measurement module 330 is connected to the electrode module 300 and the control module 153, measures the signal generated by the electrode module 300, compares it with a reference value, and transmits the result to the control module 153. includes

The display module 380 includes a function capable of controlling at least one or more display devices.

The input/output module 390 connects the control module 153 and the communication module 360, transmits signals generated by the control module 153 to the communication module 360, and transfers external signals obtained from the communication module 360 to the control module. 153, or the signal generated by the control module 153 is sent to the storage module 320, and the output signal is delivered to the display module 380.

The control module 153 is directly connected to the above-mentioned electrode module 300, potential current measurement module 330, sensor module 370, power supply module 340 and input/output module 390, and the input/output module The communication module 360, the data storage module 320, and the display module 380 are controlled through 390.

The control module 153 also includes a central processing unit that evaluates signals generated by the modules and issues commands.

Looking at an example of the function of the control module 153, the potential current measurement module 330 operates between the reference electrode 120 in the electrode module 300 and the coated object 130 by a command of the control module 153. The voltage is measured and the result is sent to the control module 153.

The control module 153 compares the result with a reference value, selects one of the sacrificial anode method and the external power supply method, and applies it to the method.

In addition, when the sacrificial anode method is applied to measure the anticorrosive current, the current between the sacrificial anode 100 of the electrode module 300 and the coated body 130 is measured, and when the external power method is applied, the insoluble anode 110 of the electrode module 300 The current between the and the coated body 130 is measured, respectively.

When measuring the amount of polarization, which is one of the methods for knowing the effect of the method, a short circuit between the anodes 100 and 110 of the electrode module 300 and the coated body 130 is performed by a command of the control module 153.

As described above, a flowchart illustrating an example of a control method for converting the sacrificial anode method, which is one of the functions of the control module 153, to the external power method is shown in FIG. 1(a).

The control unit 150 or the control system 200 measures the potential and current between the sacrificial anode and the insoluble anode in the electrode unit, and between the reference electrode and the coated body to collect data necessary for method control and compare them with the reference values to determine the sacrificial anode method and It should be noted that the technical concept of allowing one of the external power methods to be selected is characteristic, and the process of performing method control using the measured value is only an example, and the present invention is not limited thereto.

If you look at the phenomenon that occurs in the actual anti-corrosion field, there are cases where the sacrificial anode is consumed faster than the designed life expectancy.

The above problem can be solved by employing the hybrid method pursued by the present invention. As described above, one of the problems of the external power supply method is that electrical and mechanical coupling due to lightning occurs, resulting in non-corrosion.

The sacrificial anode has the advantage that the above-mentioned non-corrosion caused by lightning rarely occurs. Therefore, in the rainy season when the possibility of lightning strikes is high, the possibility of non-corrosion can be reduced by applying the sacrificial anode method through the control system.

On the other hand, the conventional invention may not respond to environmental conditions or changes in the degree of corrosion of each part, and excessive application of an anticorrosive current may cause side effects such as hydrogen embrittlement or lack of an anticorrosive current, which may be supplemented through materials.

The sacrificial anode or insoluble anode includes zinc (Zn), aluminum (Al), copper (Cu), and magnesium (Mg), and is prepared by charging magnesium to melted aluminum to form an aluminum-magnesium binary alloy. .

Alternatively, the sacrificial anode or the insoluble anode that has undergone the above process can be made of an alloy. For example, as the zinc (Zn), Zn-Bi or a zinc alloy composed of at least one selected from Zn-Bi, Al, and Mg may be used. . At this time, it is preferable that the Bi is 0.05 to 0.3 parts by weight and the Al is 0.05 to 0.2 parts by weight based on the total 100 parts by weight.

In addition, as shown in FIG. 3, aluminum alloys such as Al-3Zn, Al-3Zn-0.6Mg, Al-3Zn-0.6Mg-0.4Ce, and Al-3Zn-0.6Sn alloys can be used as the sacrificial anode according to the present invention. As a result of the anode performance test, the anode performance increased by about 10% or more compared to pure Al by alloying 3wt. further improved

In addition, as shown in FIG. 4, how high the effective capacity of the Zn—Sn alloy as a sacrificial anode was compared with actual pure Zn was compared.

In addition, as shown in FIG. 5, it shows the change in the natural potential of the zinc alloy over time.

In particular, zinc (Zn) as the sacrificial anode is an alloy composed of Sn-Zn-Bi, and 0.05 to 0.3 parts by weight of Bi or 0.6 parts by weight of Sn is alloyed with 100 parts by weight of the entire sacrificial anode. That is, the present invention showed very excellent anode efficiency by adding 0.6 wt.% Sn.

In addition, as a result of the anode performance test of the zinc alloy, the anode efficiency was continuously increased by alloying tin (Sn), and even with the addition of 3 wt.% Sn, it was possible to show better anode efficiency than before.

As another embodiment of the present invention, a camera that photographs the sacrificial anode in close proximity, is installed in a housing protecting the sacrificial anode and is connected to the camera, receives sacrificial anode image information from the cameras, and receives the sacrificial anode image information from the cameras. A communication module for transmitting image information to the control unit may be further included.

And, the control module predicts the lifespan of each anode part through the image information, analyzes the condition state based on the previously learned database, and then corrects the predicted lifespan according to the analyzed condition state to provide a comprehensive lifespan. Predictions can be output.

On the other hand, the control module converts the voltage/current analog signal measured by the potential current measuring module into a digital signal, calculates the digital signal as a voltage/current value, and compares the previously input reference value with the measured value through an input algorithm to form a sacrificial anode. Either the law or the external power law can be selectively applied.

The control module measures the current between the sacrificial anode and the coated object in the anode part and the method voltage applied between the coated object and the reference electrode, compares the measured value with the reference voltage, and when the measured value is higher than the reference voltage by 10% or more The external power method can be selected and applied.

By sequentially turning off the relay connecting the sacrificial anode and the coated body, it is possible to precisely compensate for the minute difference in the corrosion current due to the location of the coated body, partial environmental difference, and environmental change according to the season or situation.

As an embodiment, when 10% to 20% of the power consumed in the method is detected in the plurality of relays, the relays are sequentially turned off one by one to select the external power method and apply it while raising or lowering the power finely.

For example, the controller 150 or the control system 200 turns on the first relay when 11% of the power of the external power supply 140 supplied from the outside is needed, turns on the second relay when 12% is needed, and If 20% is needed, external power can be supplied differentially by turning on the first relay to the last 10th relay.

At this time, the method reference value may be set to 10% or less or 20% or more.

In this method, rather than unconditionally inputting external power, the efficiency of the method performed by the sacrificial anode is precisely judged and the external power can be input in a differential manner accordingly, thereby reducing power consumption and increasing system durability.

100: sacrificial anode
101: terminal
103: substrate
104: relay
110: insoluble anode
120: reference electrode
130: coated body, coated body part
140: external power supply
150: control unit
151: electrode module
152: potential current measuring module
153: control module
154: power module
160: communication department
170: sensor unit
180: display unit
190: anode part
200: control system
310: electrode module
320: storage module
330: potential current measurement module
340: power module
360: communication module
370: sensor module
380: display module
390: I/O module

Claims (8)

an anode portion including at least one sacrificial anode or an insoluble anode;
A reference electrode providing a reference potential when measuring potential;
An external power supply unit connected to a power source supplied from the outside and supplying direct current to the electric protection system; and
The current between the sacrificial anode in the anode part and the coated body and the corrosion-resistant voltage applied between the coated body and the reference electrode are measured and compared with the reference voltage. Including; a controller for blocking the trunk connection;
A camera that photographs the sacrificial anode in close proximity and is installed in a housing protecting the sacrificial anode is connected to the camera, receives sacrificial anode image information from the camera, and transmits the sacrificial anode image information received from the communication module to the control unit. send,
The control unit predicts the life of each anode through image information, analyzes the method state based on the previously learned database, corrects the predicted life according to the analyzed method state, and outputs a comprehensive life prediction value,
Zinc (Zn) as the sacrificial anode is an alloy composed of Sn-Zn-Bi, and 0.05 to 0.3 parts by weight of Bi and 0.6 parts by weight of Sn are alloyed with 100 parts by weight of the sacrificial anode,
The control unit converts the voltage/current analog signal measured by the potential current measuring module into a digital signal, calculates the digital signal as a voltage/current value, and compares the input reference value with the measured value through an input algorithm,
The controller converts the voltage/current analog signal measured by the potential current measuring module into a digital signal, calculates the digital signal as a voltage/current value, and compares the input reference value and measured value through an input algorithm to perform the sacrificial anode method and external power supply. In selectively applying one of the methods, the current between the sacrificial anode in the anode part and the coated body and the coated body voltage applied between the coated body and the reference electrode are measured, and the measured value is compared with the reference voltage. If it is higher than 10%, select and apply the external power method,
A plurality of relays connected between the sacrificial anode and the coated body are sequentially turned off to block them to compensate for the difference in corrosion current due to the location of the coated body, the difference in environment, and the season,
When the plurality of relays detect 10% to 20% of the power consumed in the method, the relays are sequentially turned off one by one to select the external power method and apply it while raising or lowering the power. When 11% of the power of the power supply is needed, the first relay is turned on, when 12% is needed, the second relay is turned on, and when the last 20% is needed, the first relay to the last 10th relay is turned on to supply external power in a differential manner. Hybrid cathodic protection system using an external power source. delete delete According to claim 1,
By sequentially turning off the relay connecting the sacrificial anode and the coated body, an external power source characterized in that it can compensate for the difference in corrosion current due to the location of the coated body, partial environmental differences, and environmental changes according to seasons or situations. Hybrid cathodic protection system using In the method using the hybrid cathodic protection system using an external power source of claim 1,
The control unit measures the current between the sacrificial anode in the anode and the coated object and the method voltage applied between the coated object and the reference electrode, and compares it with the reference voltage. Blocking the body-to-body connection;
converting, by the control unit, a voltage/current analog signal measured by the potential current measuring module into a digital signal, calculating the digital signal as a voltage/current value, and comparing a previously input reference value and a measurement value through an input algorithm;
The control unit predicts the life of each anode part through image information, analyzes the state of the method based on the previously learned database, and then corrects the predicted life according to the analyzed state of the method to output a comprehensive life prediction value step;
The controller converts the voltage/current analog signal measured by the potential current measuring module into a digital signal, calculates the digital signal as a voltage/current value, and compares the input reference value and measured value through an input algorithm to perform the sacrificial anode method and external power supply. In selectively applying one of the methods, the current between the sacrificial anode in the anode part and the coated body and the coated body voltage applied between the coated body and the reference electrode are measured, and the measured value is compared with the reference voltage. selecting and applying an external power method when it is higher than 10%;
When the plurality of relays detect 10% to 20% of the power consumed in the method, the relays are sequentially turned off one by one to select the external power method and apply it while raising or lowering the power. Steps to supply external power differentially by turning on the first relay when 11% of the power of the power supply is needed, turning on the second relay when 12% is needed, and turning on the first relay to the last 10th relay when the last 20% is needed Control method using a hybrid cathodic protection system using an external power source including; delete According to claim 5,
The control unit sequentially turns off relays connecting the sacrificial anode and the coated body to compensate for the difference in corrosion current due to the location of the coated body, partial environmental differences, and environmental changes according to seasons or situations; further comprising A control method using a hybrid cathodic protection system using an external power supply. delete