KR20170047666A - Dissolved oxygen removing device in water for the prevention of metallic corrosion and corrosion preventing system using the same - Google Patents

Dissolved oxygen removing device in water for the prevention of metallic corrosion and corrosion preventing system using the same Download PDF

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Publication number
KR20170047666A
KR20170047666A KR1020150148041A KR20150148041A KR20170047666A KR 20170047666 A KR20170047666 A KR 20170047666A KR 1020150148041 A KR1020150148041 A KR 1020150148041A KR 20150148041 A KR20150148041 A KR 20150148041A KR 20170047666 A KR20170047666 A KR 20170047666A
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KR
South Korea
Prior art keywords
oxygen
liquid
corrosion
dissolved oxygen
dissolved
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Application number
KR1020150148041A
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Korean (ko)
Inventor
박종욱
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프리시젼센서시스템 주식회사
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Priority to KR1020150148041A priority Critical patent/KR20170047666A/en
Publication of KR20170047666A publication Critical patent/KR20170047666A/en

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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
    • C23F11/02—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in air or gases by adding vapour phase inhibitors
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F15/00—Other methods of preventing corrosion or incrustation

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Removal Of Specific Substances (AREA)

Abstract

The present invention relates to a dissolved oxygen removing apparatus for suppressing corrosion of a metal structure placed in a corrosive environment in contact with a liquid, and a corrosion inhibiting system using the apparatus, which includes a dissolved oxygen removing apparatus for removing dissolved oxygen in the liquid, And a porous body covering at least a part of the dissolved oxygen removing device in the liquid. According to the present invention, the dissolved oxygen in the liquid is removed to inhibit the reduction reaction, thereby suppressing the oxidation reaction, which is a corrosion reaction, so that corrosion of the metal structure is suppressed.

Description

TECHNICAL FIELD [0001] The present invention relates to an apparatus for removing dissolved oxygen in a liquid used in metal corrosion suppression, and a corrosion inhibition system using the same. [0002]

The present invention relates to a dissolved oxygen removing apparatus for suppressing corrosion of a metal in contact with a liquid by removing dissolved oxygen in the liquid from a liquid, and to a corrosion inhibiting system using the same.

Structures such as bridges, water supply and drainage pipes, and water tanks are often made of metal, and are often placed in an environment that is in contact with liquids, especially water. Such a metal structure is corroded when it is used for a long time and its strength and durability are deteriorated. If it is left unattended, it may cause great damage such as a safety accident, so proper maintenance work is essential.

However, since such maintenance work is expensive, it is desirable to extend the service life by suppressing corrosion of the metal structure. Therefore, studies on corrosion prevention of metal structures have been actively conducted.

Surface treatment methods such as painting and plating are mainly used as corrosion prevention methods for metal structures. However, the surface treatment method not only raises the cost of raw materials, but also has a problem that corrosion is caused again after a certain period of time because of a limited life of the surface treatment.

Also, a method of electrically connecting a sacrificial anode having a greater ionization tendency to a metal structure than a metal constituting the structure, so that the sacrificial anode is corroded instead, thereby suppressing the corrosion of the metal structure is also used. Magnesium (Mg) or zinc (Zn) is usually used as a sacrificial anode. These sacrificial anodes are not only expensive, but also have a certain performance, so that sacrificial anodes must be replaced at regular intervals.

Therefore, a new technique for suppressing the corrosion of metal structures placed in an environment in contact with a liquid is required.

SUMMARY OF THE INVENTION The present invention has been devised to solve the problems of the prior art as described above, and it is an object of the present invention to provide a new technique for suppressing corrosion of a metal structure in an environment in contact with a liquid.

According to an aspect of the present invention, there is provided a corrosion inhibiting system for inhibiting corrosion of a metal structure in contact with a liquid, the system comprising: And a porous body covering at least a part of the dissolved oxygen removing device in the liquid.

The liquid may be water and the metal may be iron (Fe), and the dissolved oxygen removing device may be an oxygen pump or an oxygen absorber.

The oxygen pump includes an oxygen ion conductor, a first electrode and a second electrode formed on both surfaces of the oxygen ion conductor, an external power source for applying a voltage or current to the first electrode and the second electrode, And a heater for heating the conductor.

Further, the oxygen absorber may be configured to include an oxygen absorbing member and a heater for heating the oxygen absorbing member, and the oxygen absorbing member may include carbon.

The metal structure may be a pipe through which the liquid flows, and a flow channel may be formed in the porous body so as not to interfere with the flow of the liquid.

According to another aspect of the present invention, there is provided a dissolved oxygen removing apparatus for suppressing corrosion of a metal structure, which is inserted into a liquid to remove dissolved oxygen dissolved in the liquid, And a porous body made of an absorber and covering at least a part of the oxygen pump or the oxygen absorber.

According to the apparatus for removing dissolved oxygen in a liquid for inhibiting corrosion of metals according to the present invention and the corrosion inhibition system using the same, it is possible to reduce the maintenance cost of a metal structure by suppressing corrosion of a metal structure in an environment in contact with a liquid.

1 is a schematic diagram of a corrosion control system for metal structures according to the present invention.
2 is an embodiment of a metal structure corrosion inhibition system according to the present invention in which an oxygen pump is used as a dissolved oxygen removing apparatus.
3 is an embodiment of a metal structure corrosion inhibition system according to the present invention in which an oxygen absorber is used as a dissolved oxygen removing apparatus.
4 is an example in which the dissolved oxygen removing apparatus according to the present invention is installed in a metal pipe through which water flows

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited to or limited by the embodiments. In describing the various embodiments of the present invention, corresponding elements are denoted by the same names and the same reference numerals.

The present invention focuses on the principle that the total amount of the oxidation reaction and the total amount of the reduction reaction are always the same in the electrochemical corrosion reaction, thereby suppressing the reduction reaction in the liquid, thereby suppressing the oxidation reaction.

The oxidation and reduction reactions related to the corrosion of iron in water are as follows.

Fe -> Fe 2+ + 2e ------------ (1)

Fe + H 2 O - & gt ; FeO + 2H + + 2e - (2)

3Fe + 4H 2 O - > Fe 3 O 4 + 8H + + 8e - (3)

4H + + O 2 + 4e - > 2H 2 O - (4)

Equations (1) to (3) are oxidation reactions and (4) are reduction reactions. The electrons generated by the oxidation reaction are supplied to the reduction reaction. If the reduction reaction does not occur well, the generated electrons eventually accumulate and the oxidation reaction no longer occurs. Therefore, the corrosion of iron can be suppressed by suppressing the reduction reaction.

The reducing reaction scheme reaction rate of the formula (4) (r 4) can be expressed by the following equation (5).

r 4 = k 4 [H + ] [O 2 ] - (5)

According to equation (5), the rate at which water is generated by r 4 , that is, the reduction reaction, is proportional to the amount of hydrogen ion [H + ] and the amount of oxygen [O 2 ]. Therefore, reducing the amount of hydrogen ions (H + ) or oxygen (O 2 ) can suppress the reduction reaction. Since the hydrogen ion is not easily controlled in relation to the pH of the water, it is possible to suppress the reduction reaction and further the corrosion reaction by using the method of removing dissolved oxygen in the water.

This principle can be seen from the corrosion reaction formula. When the corrosion proceeds by the oxidation reaction (1) and the reduction reaction (4), the corrosion reaction equation is expressed by the following equation (6).

2Fe + 4H + + O 2 -> 2Fe 2+ + 2H 2 O (6)

When the corrosion proceeds by the oxidation reaction (2) and the reduction reaction (4), the corrosion reaction equation is expressed by the following equation (7).

2Fe + O 2 -> 2FeO ------------ (7)

When the corrosion proceeds by the oxidation reaction (3) and the reduction reaction (4), the corrosion reaction equation is expressed by the following equation (8).

3Fe + 2O 2 - > Fe 3 O 4 - (8)

The corrosion reaction equation when the corrosion progresses by the oxidation reactions (1) to (3) and the reduction reaction (4) is as shown in the following equation (9).

7Fe + 4H + + 4O 2 -> 2Fe 2+ + 2H 2 O + 2FeO + Fe 3 O 4 (9)

Referring to the corrosion equation of (6) to (9) above, it can be seen that even if any oxidation reaction occurs mainly, the corrosion reaction does not occur well if the amount of oxygen is small. The present invention is characterized by using this principle to suppress corrosion of metals by removing oxygen in the liquid, and this principle can be equally applied to other metals as well as iron (Fe).

1 is a schematic diagram of a corrosion control system for metal structures according to the present invention. Referring to FIG. 1, a metal structure corrosion inhibition system 10 according to the present invention includes a metal structure 300 in contact with a liquid 310, a metal structure 300 inserted in the liquid 310, And a porous body 200 covering at least a part of the dissolved oxygen scavenger 100 in the liquid 310. [

The liquid 310 may be water, and the metal structure 300 may be a Fe structure. The metal structure 300 may be a tube containing the liquid 310 or a tube through which the liquid 310 flows, for example, a water tank, a water supply and drainage pipe, a cold / hot water pipe, and the like. In the present invention, if the metal structure 300 is a metal structure placed in a corrosive environment in contact with a liquid, its type, shape and the like are not particularly limited.

 The dissolved oxygen removing apparatus 100 is an apparatus for removing dissolved oxygen in the liquid 310 inserted into the liquid 310, at least a part of which is covered by the porous body 200. Dissolved oxygen in the liquid 310 moves into the porous body 200 and is removed by the dissolved oxygen removing apparatus 100. The porous body 200 may be formed of graphite, carbon, a gas-permeable plastic, an oxide, a ceramic, a nitride ceramic, or the like.

The dissolved oxygen removing apparatus 100 according to an embodiment of the present invention may be an oxygen pump for pumping and removing oxygen. FIG. 2 shows an example in which the oxygen pump 400 is used as the dissolved oxygen removing apparatus 100 It is. 2, the oxygen pump 400 includes an oxygen ion conductor 410, a first electrode 420 formed on both surfaces of the oxygen ion conductor 410, and a second electrode 420 formed on both surfaces of the oxygen ion conductor 410. [ The first electrode 420 and the second electrode 420 are electrically connected to each other through a lead 440 and a lead 440 for electrically connecting the first and second electrodes 420 and 430, And an external power source 450.

The oxygen ion conductor 410 may be a stabilized zirconia made by adding various materials to zirconia (ZrO 2 ), for example, a solid electrolyte such as Yttria stabilized zirconia (YSZ), calcium stabilized zirconia (CSZ), magnesium stabilized zirconia (MSZ) Gd 2 O 3, etc. are configured in the shape of a hollow tube, such as a CeO 2 can be used a compound such as Figure 2, addition of the hollow portion 460 may allow communication with the outside air. In the present invention, the oxygen ion conductor 410 is not limited to a tube shape and may be, for example, in the form of a pellet. When the oxygen ion conductor 410 is in the form of a pellet, the hollow tube of another material such as metal or ceramic may be joined to form a hollow tube as a whole.

The first electrode 420 and the second electrode 430 are formed on different surfaces of the oxygen ion conductor 410 and may be made of platinum (Pt). 2, the first electrode 420 may be formed in the hollow portion 460 to communicate with the outside air, and the second electrode 430 may be formed on the liquid 310 in a state covered with the porous member 200 . The first and second electrodes 420 and 430 are electrically connected to the external power source 450 by a lead wire 440 to apply a voltage or a current.

A heater 441 is disposed in the hollow portion 460 to heat the oxygen pump 400 to an operating temperature. The heater 441 may be connected in series with the lead wire 440, but the present invention is not limited thereto. The heater 441 may be a separate heater that surrounds the outside of the oxygen ion conductor 410.

When the voltage or current is applied using the external power source 450 so that the first electrode 420 is positive and the second electrode 430 is negative, dissolved oxygen O in the liquid 310 is absorbed by the porous body (200) and oxygen ion conductor (410) to the hollow portion (460). This pumping operation is performed through the following equations (10) to (14).

The dissolved oxygen O dissolved in the liquid 310 evaporates into the porous body 200 according to the following equation (10) to become oxygen molecules.

2 O = O 2 - (10)

The oxygen molecules O 2 in the porous body 200 are decomposed again into oxygen atoms O in the second electrode 430 as shown in Equation 11 and then supplied to the second electrode 430 in the same manner as in Equation And becomes an oxygen ion.

O 2 = 2O (11)

2O + 4e = 2O 2 - (12)

Oxygen ions are moved toward the first electrode 420 by the electromotive force applied between the first and second electrodes 420 and 430 to emit electrons and become oxygen atoms again as in Equation (13) Molecules are combined and exited to the hollow portion 460.

2O 2- = 2O + 4e - (13)

2O = O 2 - (14)

2, when the dissolved oxygen removing apparatus 100 is configured as the oxygen pump 400 and electromotive force is applied between the first and second electrodes 420 and 430 of the oxygen pump 400, The dissolved oxygen dissolved in the liquid is reduced and the corrosive reaction of the metal structure 300 is suppressed.

As the dissolved oxygen removing apparatus 100, an oxygen absorber for absorbing and removing oxygen may be used. Fig. 3 shows an example in which the oxygen absorber 500 is used as the dissolved oxygen scavenger 100. Fig. Referring to FIG. 3, the oxygen absorber 500 may include an oxygen absorbing member 510 and a heater 520 for heating the oxygen absorbing member 510. The oxygen absorbing member 510 may be a carbon-containing material, for example, activated carbon. The heater 520 is installed inside or outside of the oxygen absorbing member 510 to be heated to a predetermined temperature and is connected to an external power source (not shown) through a lead wire 530, May be protected by a tube 540.

In the case where a substance containing carbon is used as the oxygen absorbing member 510, for example, dissolved oxygen dissolved in the liquid 310 is evaporated into the porous body 200, and the evaporated oxygen molecules are expressed by the following equations (15) and / RTI > and / or may be removed from the liquid 310 by reaction with the oxygen absorbing member 510 by equation (16).

C + O 2 = CO 2 - (15)

C + 1 / 2O 2 = CO - (16)

As a result, the amount of dissolved oxygen in the liquid 310 is reduced to suppress the reduction reaction, which may lead to suppression of the corrosion reaction. After the oxygen absorber 500 is used for a certain period of time, it can be taken out of the liquid 310 and then subjected to reduction treatment to remove the absorbed oxygen and reuse it.

4 is an example in which the dissolved oxygen removing apparatus 100 according to the present invention is installed in a metal pipe through which water such as a water supply pipe passes. 4, the porous body 200 is installed in the metal pipe 300 through which the water 310 passes, and the dissolved oxygen removing apparatus 100 according to the present invention is inserted into the porous body 200. The porous body (200) may be formed with a flow channel (210) so as not to interfere with the flow of water. The dissolved oxygen removing apparatus 100 may be constituted by the oxygen pump 400 of FIG. 2 or the oxygen absorber 500 of FIG. 4, the dissolved oxygen dissolved in the water 310 passing through the metal pipe 300 is reduced so that the reduction reaction is suppressed. As a result, the oxidation reaction that corrodes the metal pipe 300 Can be suppressed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. For example, in the embodiment, the dissolved oxygen removing device and the porous body have been described as separate structures, but the porous body may be included in the dissolved oxygen removing apparatus. Accordingly, the scope of protection of the present invention should be determined by the description of the claims and their equivalents.

10: corrosion inhibition system
100: Dissolved Oxygen Removal Device
200: Porous body 210: Flow channel
300: metal structure 310: liquid
400: oxygen pump 410: oxygen ion conductor
420: first electrode 430: second electrode
440, 530: lead wire 450: external power source
441, 520: Heater
500: oxygen absorber 510: oxygen absorbing member
540: Insulated tube

Claims (8)

A corrosion inhibiting system for inhibiting corrosion of a metallic structure in contact with a liquid,
A dissolved oxygen removing device inserted in the liquid and for removing dissolved oxygen in the liquid; And
A porous body covering at least a part of the dissolved oxygen removing device in the liquid;
The corrosion inhibiting system comprising: The method according to claim 1,
Wherein the dissolved oxygen removing device is an oxygen pump or an oxygen absorber. 3. The method of claim 2,
Wherein when the dissolved oxygen removing apparatus is an oxygen pump,
Oxygen ion conductors;
A first electrode and a second electrode formed on both surfaces of the oxygen ion conductor;
An external power source for applying a voltage or a current to the first electrode and the second electrode; And
A heater for heating the oxygen ion conductor;
The corrosion inhibiting system comprising: 3. The method of claim 2,
When the dissolved oxygen removing apparatus is an oxygen absorber,
An oxygen absorbing member; And
A heater for heating the oxygen absorbing member;
The corrosion inhibiting system comprising: 5. The method of claim 4,
Wherein the oxygen absorbing member comprises carbon. The method according to claim 1,
Wherein the liquid is water and the metal is iron (Fe). The method according to claim 1,
Wherein the metal structure is a tube through which the liquid flows,
Wherein the porous body is formed with a flow channel so as not to interfere with the flow of the liquid. 1. A dissolved oxygen removing apparatus for removing dissolved oxygen dissolved in a liquid to inhibit corrosion of a metal structure in contact with the liquid,
Wherein the dissolved oxygen removing device comprises an oxygen pump or an oxygen absorber,
And a porous body covering at least a part of the oxygen pump or the oxygen absorber.
KR1020150148041A 2015-10-23 2015-10-23 Dissolved oxygen removing device in water for the prevention of metallic corrosion and corrosion preventing system using the same KR20170047666A (en)

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KR1020150148041A KR20170047666A (en) 2015-10-23 2015-10-23 Dissolved oxygen removing device in water for the prevention of metallic corrosion and corrosion preventing system using the same

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