KR20130066148A - Reliability test device and method of corrosion controlling system - Google Patents

Reliability test device and method of corrosion controlling system Download PDF

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KR20130066148A
KR20130066148A KR1020110132861A KR20110132861A KR20130066148A KR 20130066148 A KR20130066148 A KR 20130066148A KR 1020110132861 A KR1020110132861 A KR 1020110132861A KR 20110132861 A KR20110132861 A KR 20110132861A KR 20130066148 A KR20130066148 A KR 20130066148A
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reference electrode
test piece
iron plate
control system
electrolyte
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KR1020110132861A
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Korean (ko)
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정현주
정인출
조근호
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에스티엑스조선해양 주식회사
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Priority to KR1020110132861A priority Critical patent/KR20130066148A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
    • G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
    • G01N17/02—Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/403—Cells and electrode assemblies

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Abstract

The present invention precedes the test in which the plurality of individual devices are interlocked in the reliability test of the corrosion control system of the external power supply system composed of the corrosion sensor such as the reference electrode and the anode, and the plurality of individual devices such as the monitoring system and the controller. The present invention provides an apparatus and method for testing reliability of a corrosion control system to confirm in advance whether the entire corrosion control system is operating normally. According to the present invention, through the interlock test of the entire system of the corrosion control system composed of a plurality of individual devices, it is possible to reliably pre-performance evaluation prior to the practical application of the previously developed system. This will provide a systematic performance evaluation standard for corrosion control systems, and it is expected to enable qualitative evaluation of the system along with real-time monitoring of corrosion and corrosion conditions.

Description

Reliability test device and method of corrosion controlling system

The present invention precedes the test in which the plurality of individual devices are interlocked in the reliability test of the corrosion control system of the external power supply system composed of the corrosion sensor such as the reference electrode and the anode, and the plurality of individual devices such as the monitoring system and the controller. The present invention provides an apparatus and method for testing reliability of a corrosion control system to confirm in advance whether the entire corrosion control system is operating normally.

In order to prevent corrosion of metal structures located in the electrolyte, such as underground or underwater, conventionally, a cathodic protection technology, which is an electrical method of supplying an anticorrosive current, is applied. In the electrochemical method, when a DC current (corrosive current) is artificially introduced into a metal surface, a cathode reaction occurs on the metal surface, thereby preventing corrosion.

Currently, various anti-corrosive facilities are used to prevent corrosion of anti-corrosive objects (metal structures such as ships). These facilities are expressed in various ways such as electric method, corrosion detection, corrosion control system, but using electric method. The basic principle of controlling corrosion is the same. And various inventions related to this have been filed.

However, there is no description of the reliability test for the entire system other than the performance test of individual devices for the developed corrosion control system.

The present invention has been proposed to solve the above problems, in the reliability test of the corrosion control system of the external power supply system consisting of a plurality of individual devices such as a corrosion sensor and a monitoring system and a controller, such as reference electrode and anode. It is an object of the present invention to provide an apparatus and method for testing reliability of a corrosion control system in order to predetermine whether the entire corrosion control system is operating normally by performing a test in which a plurality of individual devices are interlocked.

According to an aspect of the present invention,

A third iron plate that partially applied an artificial scratch on the coated surface, a third reference electrode installed on the third iron plate to sense a potential difference generated between the third iron plate and the electrolyte and send the value to the controller, and an insoluble material A third test piece installed at a position corresponding to the third reference electrode on the third iron plate and including a positive electrode for discharging the anticorrosive current output by the controller through the electrolyte;

A monitoring system connected to the third test piece and displaying a potential difference value detected by the third reference electrode;

A controller connected to the third test piece and outputting an anticorrosive current to the anode;

Providing a reliability test device of the corrosion control system comprising a. (First device)

Here, the third reference electrode should be able to be used in the electrolyte conditions of seawater, in this case, the third reference electrode may be made of any one material of zinc, saturated caramel, silver chloride. The anode must be electrically insulated from the third iron plate.

On the other hand, the present invention,

A third iron plate which partially applied an artificial scratch on the coated surface, a third reference electrode installed on the third iron plate to sense a potential difference generated between the third iron plate and the electrolyte and send the value to the controller, and an insoluble material A third test piece installed at a position corresponding to the third reference electrode on the third iron plate and including a positive electrode for discharging the anticorrosive current output by the controller through the electrolyte;

A monitoring system connected to the third test piece and displaying a potential difference value detected by the third reference electrode;

A controller connected to the third test piece and outputting an anticorrosive current to the anode;

As a test method using the reliability test device of the corrosion control system comprising:

Continuously placing the third test piece in a state of being immersed in natural seawater at 35 ° C. for a predetermined time;

Continuously outputting an anticorrosive current to the anode by the controller;

Continuously displaying, by the monitoring system, a potential difference value sensed by the third reference electrode;

Continuously placing the third test piece in an unimmersed state for a predetermined time;

It also provides a method for testing the reliability of the corrosion control system comprising a. (First method)

Here, the third test piece is continuously placed in the immersed state for several days in a week and continuously placed in the unimmersed state for the remaining days of the week in a weekly unit.

On the other hand, the present invention,

A first test piece including a first iron plate having a coated surface, and a first reference electrode installed on the first iron plate and sensing a potential difference generated between the first iron plate and the electrolyte and sending a value to the controller;

A second iron plate which partially applied an artificial scratch to the coated surface, and a second reference electrode which is installed on the second iron plate and senses a potential difference generated between the second iron plate and the electrolyte and sends the value to the controller. 2 test pieces;

A third iron plate that partially applied an artificial scratch on the coated surface, a third reference electrode installed on the third iron plate to sense a potential difference generated between the third iron plate and the electrolyte and send the value to the controller, and an insoluble material A third test piece installed at a position corresponding to the third reference electrode on the third iron plate and including a positive electrode for discharging the anticorrosive current output by the controller through the electrolyte;

A fourth iron plate which partially applied an artificial scratch on the coated surface, a fourth reference electrode installed on the fourth iron plate and detecting a potential difference generated between the fourth iron plate and the electrolyte and sending the value to the controller; A fourth test piece including a sacrificial anode, which is a metal having a high tendency to ionize and is disposed at a position corresponding to the fourth reference electrode in the fourth iron plate and reacts strongly with iron in the electrolyte, instead of being sacrificed instead of the fourth iron plate. ;

A potential difference connected to the first test piece, the second test piece, the third test piece, and the fourth test piece, respectively, and detected by the first reference electrode, the second reference electrode, the third reference electrode, and the fourth reference electrode; A monitoring system each displaying a value;

A controller connected to the third test piece and outputting an anticorrosive current to the anode;

Also provided is a reliability test apparatus for a corrosion control system comprising a. (Second device)

Here, the first reference electrode should be able to be used in the electrolyte conditions of seawater, in which case the first reference electrode may be made of any one material of zinc, saturated caramel, silver chloride.

The second reference electrode should be usable under electrolyte conditions of seawater. In this case, the second reference electrode may be made of one of zinc, saturated caramel, and silver chloride.

The third reference electrode should be usable under electrolyte conditions of seawater. In this case, the third reference electrode may be made of one of zinc, saturated caramel, and silver chloride. The anode must be electrically insulated from the third iron plate.

In addition, the fourth reference electrode should be usable under electrolyte conditions of seawater. In this case, the fourth reference electrode may be made of any one material of zinc, saturated caramel, and silver chloride.

On the other hand, the present invention,

A first test piece including a first iron plate having a coated surface, and a first reference electrode installed on the first iron plate and sensing a potential difference generated between the first iron plate and the electrolyte and sending a value to the controller;

A second iron plate which partially applied an artificial scratch to the coated surface, and a second reference electrode which is installed on the second iron plate and senses a potential difference generated between the second iron plate and the electrolyte and sends the value to the controller. 2 test pieces;

A third iron plate that partially applied an artificial scratch on the coated surface, a third reference electrode installed on the third iron plate to sense a potential difference generated between the third iron plate and the electrolyte and send the value to the controller, and an insoluble material A third test piece installed at a position corresponding to the third reference electrode on the third iron plate and including a positive electrode for discharging the anticorrosive current output by the controller through the electrolyte;

A fourth iron plate which partially applied an artificial scratch on the coated surface, a fourth reference electrode installed on the fourth iron plate and detecting a potential difference generated between the fourth iron plate and the electrolyte and sending the value to the controller; A fourth test piece including a sacrificial anode, which is a metal having a high tendency to ionize and is disposed at a position corresponding to the fourth reference electrode in the fourth iron plate and reacts strongly with iron in the electrolyte, instead of being sacrificed instead of the fourth iron plate. ;

A potential difference connected to the first test piece, the second test piece, the third test piece, and the fourth test piece, respectively, and detected by the first reference electrode, the second reference electrode, the third reference electrode, and the fourth reference electrode; A monitoring system each displaying a value;

A controller connected to the third test piece and outputting an anticorrosive current to the anode;

As a test method using the reliability test device of the corrosion control system comprising:

Continuously placing the first test piece, the second test piece, the third test piece and the fourth test piece in a state immersed in natural seawater at 35 ° C. for a predetermined time;

Continuously outputting an anticorrosive current to the anode by the controller;

Continuously displaying, by the monitoring system, potential difference values sensed by the first reference electrode, the second reference electrode, the third reference electrode and the fourth reference electrode, respectively;

Continuously placing the first test piece, the second test piece, the third test piece and the fourth test piece in an unimmersed state for a predetermined time;

It also provides a method for testing the reliability of the corrosion control system comprising a. (Second method)

Here, the first test piece, the second test piece, the third test piece, and the fourth test piece are continuously immersed for several days during the week, and continuously unimmersed for the remaining days of the week. Repeat with the weekly unit.

According to the present invention, through the interlock test of the entire system of the corrosion control system composed of a plurality of individual devices, it is possible to reliably pre-performance evaluation prior to the practical application of the previously developed system. This will provide a systematic performance evaluation standard for corrosion control systems, and it is expected to enable qualitative evaluation of the system along with real-time monitoring of corrosion and corrosion conditions.

1 is a configuration of the reliability test apparatus of the corrosion control system according to the first embodiment of the present invention.
2 is a configuration of the reliability test apparatus of the corrosion control system according to the second embodiment of the present invention.
3 is a detailed configuration of a first test piece according to an embodiment of the present invention.
4 is a detailed configuration of a second test piece according to an embodiment of the present invention.
5 is a detailed configuration of a third test piece according to an embodiment of the present invention.
6 is a detailed configuration of a fourth test piece according to an embodiment of the present invention.
7 is a table summarizing the reliability test criteria according to the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

First Embodiment

1 shows a configuration of a reliability test apparatus of a corrosion control system according to a first embodiment of the present invention.

The present invention precedes a test in which a plurality of individual devices are interlocked in a reliability test of a corrosion control system including a corrosion sensor such as a reference electrode and an anode, and a plurality of individual devices such as a monitoring system and a controller. It is an object of the present invention to provide a reliability test apparatus of a corrosion control system that can confirm in advance whether or not normal operation, the present invention for achieving this object is the third test piece 30, the monitoring system 50 and the controller 60 is made.

For reference, the term 'test in which a plurality of individual devices are interlocked' refers to the individual devices constituting the entire corrosion control system and does not test the performance of each individual device. It means to test the performance of the entire corrosion control system (test model) that implements the interworking situation.

Although it works well in terms of individual devices, it can be another matter whether they still work properly when they form a system as a whole. Through this, reliable performance evaluation may be possible prior to the actual application of the previously developed system, and this is the technical purpose and effect to be achieved by the present invention.

Hereinafter, the reliability test apparatus of the corrosion control system according to the first embodiment of the present invention will be described in detail.

For reference, the first embodiment of the present invention and the second embodiment to be described later are all premised on the reliability test of the corrosion control system of the external power supply system applied to the metal structure of the hull, such as the ballast tank of the ship or the outer shell. do.

The third test piece 30 is a kind of sensor for evaluating whether or not corrosion occurs in the hull or the like when the external power supply corrosion control system is applied, that is, whether the corrosion control system is operating properly. 31), the third reference electrode 32 and the anode 33.

5 shows a detailed configuration of this third test piece.

The third iron plate 31 is a model of a metal structure of a hull such as a ballast tank or an outer plate of a ship, which is an anticorrosive object, and uses a ship thick plate of 500 × 800 mm. After the third iron plate 31 is pretreated with ISO 8501-1 Sa 2 1/2 Grade, the commercial Epoxy primer for ballast tanks is air-cured twice with 160 µm double-sided coating and completely cured. And an artificial scratch (1) is partially applied to this painted surface. To this end, in the embodiment of the present invention by using a sharp knife to draw a line of 300mm in 3mm thickness 3 lines 100mm spacing. The scratch 1 is a model of a state in which the ballast tank or outer plate of the ship is damaged and the surface is peeled off, and in the embodiment of the present invention, it is possible to check whether or not corrosion occurs in the scratch 1 part. Of course, in the present invention, the third iron plate 31 is preferably the same as the material of the hull or other metal actually applied to the ship.

As shown in FIG. 5, the third reference electrode 32 is installed on top of the third iron plate 31 by using a stud bolt and a nut. In this case, the stud bolt is constructed in advance before the painting work of the third iron plate 31 so as not to damage the coating film. The third reference electrode 32 detects a potential difference generated between the third iron plate 31 and the electrolyte in a test process and transmits the value to the controller 60. In this case, the third reference electrode 32 should be able to be used under electrolyte conditions of seawater. This is because the present invention is directed to a corrosion control system applied to a ship operating in seawater. In order to satisfy such a condition, the third reference electrode 32 may be made of any one material of zinc, saturated caramel, and silver chloride. In the case of the actual corrosion control system, the ship uses a zinc (Zn) electrode as a common reference electrode, and a saturated calomel (SCE) electrode or silver chloride (Ag / AgCl) electrode is used in piping and other fields. Of course, in the present invention, the third reference electrode 32 is preferably the same as the material of the reference electrode actually applied to the ship.

An anode 33 is provided at a position corresponding to the third reference electrode 32 on the third iron plate 31. That is, in the embodiment of the present invention, the anode 33 is installed in the lower portion of the third iron plate 31 using the stud bolt and nut as shown in FIG. In this case, the anode 33 should be electrically insulated from the third iron plate 31. The anode 33 serves to discharge the anticorrosive current output from the controller 60 through the electrolyte during the test process. In this process, since the anode 33 is an insoluble material, it does not corrode or melt.

The monitoring system 50 is connected with the third test piece 30. The monitoring system 50 displays the potential difference value detected by the third reference electrode 32 so that the experimenter can confirm it.

The controller 60 is connected to the third test piece 30. The controller 60 receives the potential difference signal of the third reference electrode 32 and outputs a protection current required for the anode 33.

Hereinafter, the reliability test method of the corrosion control system using the reliability test apparatus of the corrosion control system described above will be described in detail.

First, the third test piece 30 is continuously placed in a state of being immersed in the seawater tank 80 in which the natural seawater 70 at 35 ° C. is placed for a predetermined time. In this state, the controller 60 continuously outputs the anticorrosive current to the anode 33, and the monitoring system 50 continuously displays the potential difference value detected by the third reference electrode 32. . The experimenter measures the potential difference value displayed by the monitoring system 50. In general, the potential difference between the third iron plate 31 and the third reference electrode 32 in the electrolyte can be obtained when the optimum anticorrosive effect is obtained when -220 mV based on zinc and -850 mV based on silver chloride. The anticorrosive performance of the corrosion control system of the corresponding external power supply can be evaluated by comparing the potential difference value measured as a reference. After this measurement operation, the third test piece 30 is now continuously placed in the unimmersed state for a predetermined time. This can be realized through the process of discharging the natural sea water 70 put in the sea water tank (80).

In the above test procedure, the third test piece 30 is immersed in the natural sea water 70 when the ballast tank of the ship is filled with the ballast water or the shell of the ship is submerged in the sea water (for example, On the contrary, the third test piece 30 is not immersed in the natural sea water 70 when the ballast tank of the ship is empty or the shell of the ship is not locked in the sea water ( For example, in order to implement a state of loading and unloading cargo, the ship generally repeats these two states continuously.

In order to realize this actual situation, in the present invention, the third test piece 30 is continuously placed in the immersed state for several days during the week and continuously placed in the unimmersed state for the remaining days of the week. Repeat every week.

Second Embodiment

Figure 2 shows the configuration of the reliability test apparatus of the corrosion control system according to a second embodiment of the present invention.

Reliability test apparatus of the corrosion control system according to a second embodiment of the present invention is the first test piece 10, the second test piece 20, the third test piece 30, the fourth test piece 40, the monitoring system 50 And a controller 60, the second embodiment of the present invention further adds the first test piece 10, the second test piece 20, and the fourth test piece 40 in the case of the first embodiment described above. It is characterized by one.

The first test piece 10, the second test piece 20, and the fourth test piece 40 serve as a comparative test group corresponding to the third test piece 30 described above. (10) serves as a test piece showing a standard for a situation in which the coating is not damaged and corrosion does not occur, and the second test piece 20 is a standard for a situation where the coating is damaged and corrosion occurs in natural seawater. When the third test piece 30 is applied to the corrosion control system of the external power supply method (object of reliability evaluation according to the present invention) in the same state that the second test piece 20 is placed, When the sacrificial anode 43 is applied in the same state that the second test piece 20 is placed, the fourth test piece 40 serves as a test piece showing whether the anti-corrosion performance is properly implemented. It serves as a test piece to show whether anticorrosive performance is being implemented properly.

Therefore, the experimenter evaluates whether the corrosion control system of the external power supply system operates properly through the reliability test apparatus of the corrosion control system according to the second embodiment of the present invention (the third test piece 30) and at the same time, It can be compared with the performance of the sacrificial anode 43 acting (the fourth test piece 40), and at the same time, the standard potential difference value (the first test piece 10) and the corrosion in the situation where the corrosion does not occur in the natural seawater state The quality of evaluation can be further improved by simultaneously referring to the standard potential difference value (second test piece 20) in the situation.

Hereinafter, the reliability test apparatus of the corrosion control system according to the second embodiment of the present invention will be described in detail.

3 is a detailed configuration of a first test piece according to an embodiment of the present invention, Figure 4 is a detailed configuration of a second test piece according to an embodiment of the present invention, Figure 6 is a fourth configuration of a fourth test piece according to an embodiment of the present invention Show detailed configuration.

The third test piece 30 has already been described above, and since the content thereof is the same in the second embodiment of the present invention, redundant description will be omitted below.

The first test piece 10 is a kind of sensor capable of confirming a standard potential difference value in a state where corrosion does not occur in a natural seawater state, and includes a first iron plate 11 and a first reference electrode 12.

The first iron plate 11 is basically the same as the above-described third iron plate 31, but differs from the third iron plate 31 in that the first iron plate 11 is not scratched. Such scratching is modeled in a state in which the paint of the ballast tank or the outer shell of the ship is not peeled off, and corrosion does not occur in the first iron plate 11 during the experiment.

As shown in FIG. 3, the first reference electrode 12 is installed on the first iron plate 11 by using a stud bolt and a nut. The first reference electrode 12 is basically the same as the third reference electrode 32 described above, but detects the potential difference generated between the first iron plate 11 and the electrolyte and sends the value to the controller 60. It is distinguished in that.

The second test piece 20 is a kind of sensor capable of confirming a standard potential difference value in a situation where corrosion occurs in a natural seawater state, and includes a second iron plate 21 and a second reference electrode 22.

The 2nd iron plate 21 is the same as the 3rd iron plate 31 mentioned above.

As shown in FIG. 4, the second reference electrode 22 is installed on the second iron plate 21 by using a stud bolt and a nut. The second reference electrode 22 is basically the same as the third reference electrode 32 described above, but detects the potential difference generated between the second iron plate 21 and the electrolyte and sends the value to the controller 60. It is distinguished in that.

The present invention is to evaluate the performance of the corrosion control system of the external power supply system of the electrical method, and generally adopted the sacrificial anode 43 method used in the ballast tank of the ship as a comparison group, the fourth test piece ( 40 is a kind of sensor for evaluating whether corrosion is generated in the hull or the like when the sacrificial anode 43 is applied, that is, whether the sacrificial anode 43 is operating properly. 4 includes a reference electrode 42 and a sacrificial anode 43.

The 4th iron plate 41 is the same as the 3rd iron plate 31 mentioned above.

As shown in FIG. 6, the fourth reference electrode 42 is installed on the top of the fourth iron plate 41 by using a stud bolt and a nut. The fourth reference electrode 42 is basically the same as the third reference electrode 32 described above, but detects the potential difference generated between the fourth iron plate 41 and the electrolyte and sends the value to the controller 60. It is distinguished in that.

The sacrificial anode 43 is provided at a position corresponding to the fourth reference electrode 42 on the fourth iron plate 41. That is, in the embodiment of the present invention, the sacrificial anode 43 is installed in the lower portion of the fourth iron plate 41 by using a stud bolt and a nut as shown in FIG. 6. The sacrificial anode 43 is made of metals such as aluminum, magnesium, and zinc, which have a higher ionization tendency (higher corrosion resistance) than iron, and react more strongly than iron in the electrolyte during the test to replace the fourth iron plate 41. Consumed sacrificially. Therefore, in the ideal case, the fourth iron plate 41 (ie, the ship) does not corrode or melt due to the reflection effect of the sacrificial anode 43 being consumed. The required amount of the sacrificial anode 43 is designed to reflect the area of the fourth iron plate 41, and when the amount thereof is insufficient, corrosion occurs.

The monitoring system 50 is connected to the first test piece 10, the second test piece 20, the third test piece 30, and the fourth test piece 40, respectively, and includes a first reference electrode 12 and a second reference electrode ( 22) the potential difference values sensed by the third reference electrode 32 and the fourth reference electrode 42 are respectively displayed. In addition, the controller 60 is connected to only the third test piece 30 and outputs an anticorrosive current to the anode 33.

Hereinafter, the reliability test method of the corrosion control system using the reliability test apparatus of the corrosion control system according to the second embodiment of the present invention will be described in detail.

First, the first test piece 10, the second test piece 20, the third test piece 30 and the fourth test piece 40 are each immersed in the seawater tank 80 in which the natural sea water 70 of 35 ℃ The state is left continuously for a predetermined time. In this case, the 1st test piece 10, the 2nd test piece 20, the 3rd test piece 30, and the 4th test piece 40 are arrange | positioned sequentially so that the space | interval may be 300 mm or more. In this state, the controller 60 continuously outputs an anticorrosive current to the anode 33. Thereafter, the monitoring system 50 continuously measures the potential difference values detected by the first reference electrode 12, the second reference electrode 22, the third reference electrode 32, and the fourth reference electrode 42, respectively. Indicated by. The experimenter measures the potential difference value displayed by the monitoring system 50. In general, the potential difference between the third iron plate 31 and the third reference electrode 32 in the electrolyte can be obtained when the optimum anticorrosive effect is detected when 220 mV based on zinc and 850 mV based on silver chloride are used. By comparing the measured potential difference values, the corrosion protection performance of the corresponding external power supply system can be evaluated. After this measurement operation, the first test piece 10, the second test piece 20, the third test piece 30 and the fourth test piece 40 are continuously placed in the unimmersed state for a predetermined time. This can be realized through the process of discharging the natural sea water 70 put in the sea water tank (80).

In the test procedure described above, the first test piece 10, the second test piece 20, the third test piece 30 and the fourth test piece 40 to be immersed in the natural sea water 70, the ballast tank of the ship Is to be filled with ballast water or the shell of the ship is submerged in seawater (e.g., with full load), on the contrary, the first test piece 10, the second test piece 20, and the third test piece Leaving the 30 and the fourth test piece 40 unimmersed in the natural sea water 70 may occur when the ballast tank of the ship is empty or the outer shell of the ship is not locked in the sea water (for example, In general, the ship repeatedly repeats these two states.

In order to realize such a real situation, in the present invention, the first test piece 10, the second test piece 20, the third test piece 30 and the fourth test piece 40 are immersed for several days during the week. Leave continuously and remain immersed for the rest of the week, repeating weekly. In the second embodiment of the present invention, the natural seawater 70 is exchanged on a weekly basis to minimize the effect of chloride and pH change caused by the dissolution of the sacrificial anode 43.

Performance Evaluation and Criteria

* Corrosion performance evaluation: When the specimen is immersed in seawater, the corrosion of the metal is activated and the change of the potential difference value is measured from the reference electrode installed on each specimen. In the first test piece 10, the metal surface is not corrosive due to the coating film, and in the case of the third test piece 30 to which the anode 33 with artificial defects is attached, when the anticorrosive current is supplied and it operates normally, it is based on zinc. 220mV, silver chloride has a potential value of -850mV. The second test piece 20 has a potential range in which iron is ionized. Based on the results of the performance evaluation according to the present invention artificially promotes the corrosion to determine the characteristics of the corrosion according to the fastening of the anode 33, and to the reliability test of the corrosion control system including a corrosion sensor, monitoring system and controller Therefore, the performance of the corrosion control system can be evaluated and anticorrosive characteristics can be grasped prior to the interlock test of the entire system.

* Corrosion resistance evaluation: It is also possible to evaluate the corrosion resistance by evaluating the painted surface of the test piece. To this end, after a certain period of time after the anti-corrosion performance test, the specimens are taken out, washed with fresh water, and left to stand at room temperature for 1 hour.

In this case, the method and criteria for determining the corrosion resistance of the test specimen shall comply with ASTM, the international standard. That is, in case of corrosion, the rust generation amount of the test piece is evaluated by dividing it from 0 to 10 in proportion to the area of the test piece based on the rust generation standard diagram of ASTM D 610. In the case of swelling, the size and density of swelling are determined based on ASTM D 714. In this case, the size of the swelling is represented by 5 steps from 10 to 2, for example, 10 is a case in which no swelling is generated, and 8 is a degree of swelling of the smallest size that can be visually determined. On the other hand, the density of occurrence of swelling is shown in four stages. In the case of peeling, the corrosion of the paint coating and the peeled defect accompanying the paint coating were evaluated in the scratch of the test specimen based on ASTM D 1654. After removing the coating with weak adhesion along the scratch line, the average rust creepage was measured. Record from 0 to 10 according to the size.

It will be apparent to those skilled in the art that various modifications, substitutions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. will be. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are intended to illustrate and not to limit the technical spirit of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments and accompanying drawings. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

1: scratch
Reference Signs List 10 first test piece 11 first iron plate 12 first reference electrode
20: second test piece 21: second iron plate 22: second reference electrode
30: third test piece 31: third iron plate 32: third reference electrode
33: anode
40: fourth test piece 41: fourth iron plate 42: fourth reference electrode
43: sacrificial anode
50: monitoring system
60: controller
70: natural sea water
80: seawater tank

Claims (18)

A third iron plate that partially applied an artificial scratch on the coated surface, a third reference electrode installed on the third iron plate to sense a potential difference generated between the third iron plate and the electrolyte and send the value to the controller, and an insoluble material A third test piece installed at a position corresponding to the third reference electrode on the third iron plate and including a positive electrode for discharging the anticorrosive current output by the controller through the electrolyte;
A monitoring system connected to the third test piece and displaying a potential difference value detected by the third reference electrode;
A controller connected to the third test piece and outputting an anticorrosive current to the anode;
Reliability test apparatus of the corrosion control system comprising a. The method of claim 1,
The third reference electrode is a reliability test device of the corrosion control system, characterized in that it can be used in the electrolyte conditions of sea water. 3. The method of claim 2,
The third reference electrode is a reliability test device of the corrosion control system, characterized in that the material of any one of zinc, saturated caramel, silver chloride. The method of claim 1,
And the anode is electrically insulated from the third iron plate. A first test piece including a first iron plate having a coated surface, and a first reference electrode installed on the first iron plate and sensing a potential difference generated between the first iron plate and the electrolyte and sending a value to the controller;
A second iron plate which partially applied an artificial scratch to the coated surface, and a second reference electrode which is installed on the second iron plate and senses a potential difference generated between the second iron plate and the electrolyte and sends the value to the controller. 2 test pieces;
A third iron plate that partially applied an artificial scratch on the coated surface, a third reference electrode installed on the third iron plate to sense a potential difference generated between the third iron plate and the electrolyte and send the value to the controller, and an insoluble material A third test piece installed at a position corresponding to the third reference electrode on the third iron plate and including a positive electrode for discharging the anticorrosive current output by the controller through the electrolyte;
A fourth iron plate which partially applied an artificial scratch on the coated surface, a fourth reference electrode installed on the fourth iron plate and detecting a potential difference generated between the fourth iron plate and the electrolyte and sending the value to the controller; A fourth test piece including a sacrificial anode, which is a metal having a high tendency to ionize and is disposed at a position corresponding to the fourth reference electrode in the fourth iron plate and reacts strongly with iron in the electrolyte, instead of being sacrificed instead of the fourth iron plate. ;
A potential difference connected to the first test piece, the second test piece, the third test piece, and the fourth test piece, respectively, and detected by the first reference electrode, the second reference electrode, the third reference electrode, and the fourth reference electrode; A monitoring system each displaying a value;
A controller connected to the third test piece and outputting an anticorrosive current to the anode;
Reliability test apparatus of the corrosion control system comprising a. The method of claim 5, wherein
The first reference electrode is a reliability test device of the corrosion control system, characterized in that it can be used in the electrolyte conditions of sea water. The method according to claim 6,
The first reference electrode is a reliability test device of the corrosion control system, characterized in that the material of any one of zinc, saturated caramel, silver chloride. The method of claim 5, wherein
The second reference electrode is a reliability test device of the corrosion control system, characterized in that it can be used in the electrolyte conditions of seawater. The method of claim 8,
The second reference electrode is a reliability test device of the corrosion control system, characterized in that the material of any one of zinc, saturated caramel, silver chloride. The method of claim 5, wherein
The third reference electrode is a reliability test device of the corrosion control system, characterized in that it can be used in the electrolyte conditions of sea water. 11. The method of claim 10,
The third reference electrode is a reliability test device of the corrosion control system, characterized in that the material of any one of zinc, saturated caramel, silver chloride. The method of claim 5, wherein
And the anode is electrically insulated from the third iron plate. The method of claim 5, wherein
The fourth reference electrode is a reliability test apparatus of the corrosion control system, characterized in that it can be used in the electrolyte conditions of sea water. The method of claim 13,
The fourth reference electrode is a reliability test device of the corrosion control system, characterized in that the material of any one of zinc, saturated caramel, silver chloride. A third iron plate that partially applied an artificial scratch on the coated surface, a third reference electrode installed on the third iron plate to sense a potential difference generated between the third iron plate and the electrolyte and send the value to the controller, and an insoluble material A third test piece installed at a position corresponding to the third reference electrode on the third iron plate and including a positive electrode for discharging the anticorrosive current output by the controller through the electrolyte;
A monitoring system connected to the third test piece and displaying a potential difference value detected by the third reference electrode;
A controller connected to the third test piece and outputting an anticorrosive current to the anode;
As a test method using the reliability test device of the corrosion control system comprising:
Continuously placing the third test piece in a state of being immersed in natural seawater at 35 ° C. for a predetermined time;
Continuously outputting an anticorrosive current to the anode by the controller;
Continuously displaying, by the monitoring system, a potential difference value sensed by the third reference electrode;
Continuously placing the third test piece in an unimmersed state for a predetermined time;
Reliability test method of the corrosion control system comprising a. The method of claim 15,
The third test piece is continuously immersed for several days in a week and continuously immersed in an unimmersed state for the remaining days of the week, the corrosion control system of claim 1 Reliability Test Method. A first test piece including a first iron plate having a coated surface, and a first reference electrode installed on the first iron plate and sensing a potential difference generated between the first iron plate and the electrolyte and sending a value to the controller;
A second iron plate which partially applied an artificial scratch to the coated surface, and a second reference electrode which is installed on the second iron plate and senses a potential difference generated between the second iron plate and the electrolyte and sends the value to the controller. 2 test pieces;
A third iron plate that partially applied an artificial scratch on the coated surface, a third reference electrode installed on the third iron plate to sense a potential difference generated between the third iron plate and the electrolyte and send the value to the controller, and an insoluble material A third test piece installed at a position corresponding to the third reference electrode on the third iron plate and including a positive electrode for discharging the anticorrosive current output by the controller through the electrolyte;
A fourth iron plate which partially applied an artificial scratch on the coated surface, a fourth reference electrode installed on the fourth iron plate and detecting a potential difference generated between the fourth iron plate and the electrolyte and sending the value to the controller; A fourth test piece including a sacrificial anode, which is a metal having a high tendency to ionize and is disposed at a position corresponding to the fourth reference electrode in the fourth iron plate and reacts strongly with iron in the electrolyte, instead of being sacrificed instead of the fourth iron plate. ;
A potential difference connected to the first test piece, the second test piece, the third test piece, and the fourth test piece, respectively, and detected by the first reference electrode, the second reference electrode, the third reference electrode, and the fourth reference electrode; A monitoring system each displaying a value;
A controller connected to the third test piece and outputting an anticorrosive current to the anode;
As a test method using the reliability test device of the corrosion control system comprising:
Continuously placing the first test piece, the second test piece, the third test piece and the fourth test piece in a state immersed in natural seawater at 35 ° C. for a predetermined time;
Continuously outputting an anticorrosive current to the anode by the controller;
Continuously displaying, by the monitoring system, potential difference values sensed by the first reference electrode, the second reference electrode, the third reference electrode and the fourth reference electrode, respectively;
Continuously placing the first test piece, the second test piece, the third test piece and the fourth test piece in an unimmersed state for a predetermined time;
Reliability test method of the corrosion control system comprising a. The method of claim 17,
The first test piece, the second test piece, the third test piece and the fourth test piece are continuously placed in the immersed state for several days during the week and continuously left unimmersed for the remaining days of the week. Reliability test method of the corrosion control system, characterized in that for repeating the weekly.
KR1020110132861A 2011-12-12 2011-12-12 Reliability test device and method of corrosion controlling system KR20130066148A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103983500A (en) * 2014-05-16 2014-08-13 深圳大学 Test method and test system for manufacturing uniformly corroded metal test piece in batch
KR20150074897A (en) * 2013-12-24 2015-07-02 동명대학교산학협력단 Circulating seawater bath for electric protection against corrosion properties test
KR20160050363A (en) * 2014-10-29 2016-05-11 삼성중공업 주식회사 Test Apparatus of Cathodic Protection for Marine Structure
KR20160068424A (en) * 2014-12-05 2016-06-15 삼성중공업 주식회사 Coating film performance evaluating apparatus
CN110346273A (en) * 2019-06-27 2019-10-18 北京科技大学 A kind of weathering steel research and development method based on Quick Acquisition corrosion data

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150074897A (en) * 2013-12-24 2015-07-02 동명대학교산학협력단 Circulating seawater bath for electric protection against corrosion properties test
CN103983500A (en) * 2014-05-16 2014-08-13 深圳大学 Test method and test system for manufacturing uniformly corroded metal test piece in batch
KR20160050363A (en) * 2014-10-29 2016-05-11 삼성중공업 주식회사 Test Apparatus of Cathodic Protection for Marine Structure
KR20160068424A (en) * 2014-12-05 2016-06-15 삼성중공업 주식회사 Coating film performance evaluating apparatus
CN110346273A (en) * 2019-06-27 2019-10-18 北京科技大学 A kind of weathering steel research and development method based on Quick Acquisition corrosion data

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