JP5461093B2 - Sacrificial anode panel and anticorrosion method using sacrificial anode panel - Google Patents

Description

  The present invention relates to a sacrificial anode panel that realizes corrosion protection of a steel material, and a corrosion prevention method using the sacrificial anode panel.

  As a corrosion prevention method for steel materials, a method of coating steel materials and a method of using a sacrificial anode material are generally used.

  First, the anticorrosion method by painting will be described. The anticorrosion method by painting realizes anticorrosion by forming a coating film on the surface of the steel material and suppressing contact of the steel material with oxygen, water or the like that causes rust (corrosion). However, this anticorrosion method by painting has several problems.

  First, due to coating unevenness and bubbles during coating, holes are formed in the coating film, and the steel material comes into contact with corrosion-causing substances such as water and oxygen, and rust is generated and grows inside the coating film. Has the problem.

  Secondly, in order to sufficiently secure the durability of the coating film, it is necessary to remove all the coating film and rust from the steel material and perform re-coating on the steel material on which rust has already occurred. This rust removal work is performed using a grinder or blast.For example, steel members that cannot be moved from the installation location such as bridges need to be processed at this site. It has a very serious problem.

  Thirdly, if re-coating is repeated without sufficiently removing rust and a deteriorated coating film, there is a problem that the anticorrosion effect decreases. For example, a situation has occurred in which rust again occurs several weeks after repainting.

  Next, the anticorrosion method using the sacrificial anode material will be described. In the corrosion prevention method using this sacrificial anode material, a metal having a lower natural potential than the steel material (for example, zinc, aluminum, magnesium, or an alloy thereof) is installed on the surface of the steel material, etc. It is a method of supplying. That is, the sacrificial anode material is actively rusted to prevent rusting of the steel material (see, for example, Patent Document 1). However, the anticorrosion method using this sacrificial anode material has several problems.

  First, since the steel material is covered with the sacrificial anode material, it is necessary to remove the sacrificial anode material at the time of maintenance such as checking the state of the steel material, and this maintenance work takes a long time. ing. Maintenance work is a very important work for confirming the effect of anticorrosion, and no matter how effective the anticorrosion method is, it cannot be left for a long period of time.

  Secondly, it is necessary to drop all the rust from the steel material and install the sacrificial anode material for the steel material already rusted. This is an operation required to ensure sufficient electrical contact between the steel material and the sacrificial anode material. This process of removing rust has the problem that it is extremely difficult as described above.

JP 2002-226986 A

  The present invention has been made in view of the above-described situation, and its purpose is to provide a high corrosion protection effect, good maintainability, and rusting (corroded) steel material. However, it is an object of the present invention to provide a sacrificial anode panel that can be easily applied and a corrosion prevention method using the sacrificial anode panel.

  To achieve the above object, a sacrificial anode panel according to the present invention is a sacrificial anode panel that is installed on a steel material to prevent corrosion, and the sacrificial anode panel includes a sacrificial anode material body and the sacrificial anode panel. The sacrificial anode material body is made of a metal material that is electrically base and porous compared to the steel material, and the magnet is composed of the sacrificial anode. It was installed in the contact surface where a material main body and the said steel material contact.

  With this configuration, the sacrificial anode panel can be easily attached to and detached from the steel material, so that maintainability is improved. Moreover, since the sacrificial anode panel is made of a metal having a void (such as powder sintered metal), it is very light and can be easily removed by an operator.

  In addition, by adopting a porous metal material for the sacrificial anode material body, it is possible to actively enhance the anticorrosion effect by utilizing efficient water absorption such as rain that causes rust. . In other words, when the sacrificial anode material body gets wet due to rain or the like, the sacrificial anode material body retains this rainwater in the internal voids, thereby improving the conductivity of the sacrificial anode material body, and electrons from the steel material to the sacrificial anode material body Therefore, the corrosion protection effect of the steel material can be improved.

  In the sacrificial anode panel, the sacrificial anode panel is configured to be detachable from the steel material by a magnet installed on the sacrificial anode material body and a magnet fixed to the steel material.

  With this configuration, even if the steel material is already rusted, the sacrificial anode panel can be installed by removing rust only at the location where the magnet is fixed. Therefore, anti-corrosion treatment can be realized for the already rusted steel material by simple pretreatment (magnet fixation).

  Said sacrificial anode panel WHEREIN: The said sacrificial anode material main body is a structure which can absorb and hold | maintain a liquid by capillary action. With this configuration, when rain or the like comes into contact with the sacrificial anode material body, the sacrificial anode material body absorbs water therein and holds it for a relatively long time, so that the anticorrosion effect can be improved.

  Said sacrificial anode panel WHEREIN: The said sacrificial anode material main body was shape | molded by sintering of metal powder, and it shape | molded so that the porosity might be 20-40%.

  Said sacrificial anode panel WHEREIN: The said sacrificial anode material main body has a zinc plate in the surface opposite to the said contact surface of the said sacrificial anode material main body. With this configuration, the anticorrosion effect can be enhanced. In addition, since the water absorption property and moisture absorption property of a sacrificial anode material main body will fall when the installation amount of a zinc plate increases, it is desirable to design suitably by balance of both.

Said sacrificial anode panel WHEREIN: The said sacrificial anode material main body has a water absorbing material in the said contact surface, and the said water absorbing material has the deformability which deform | transforms along the unevenness | corrugation of the surface of the said steel material. It is characterized by. With this configuration, it is possible to sufficiently ensure electrical contact between the steel material whose surface is not smooth due to rust and the sacrificial anode material body.

  The anticorrosion method according to the present invention for achieving the above object is an anticorrosion method for a steel material using the sacrificial anode panel, comprising a preparation step for fixing a magnet to the steel material, and fixing to the magnet and the sacrificial anode panel It has the installation step which fixes the said sacrificial anode panel to the said steel material with the magnet which did it.

  The anticorrosion method according to the present invention for achieving the above object is an anticorrosion method for a steel material using the sacrificial anode panel, wherein a part of the steel material on which rust has already been generated is polished to expose a bare metal. And a step of preparing to fix the magnet to the base metal, and a step of fixing the sacrificial anode panel to the steel material by the magnet and the magnet fixed to the sacrificial anode panel. .

  With this configuration, rust may be roughly removed and does not need to be completely removed, so that the sacrificial anode panel can be easily installed. Moreover, since the steel material and the sacrificial anode panel are fixed using a magnet, the panel can be easily attached and detached. For this reason, the maintenance work for confirming the progress of the rust of the steel material can be performed regularly in a short time with an easy work, and the maintenance cost can be suppressed.

  In the above-described anticorrosion method, a water-absorbing material installation step for installing the water-absorbing material is provided between the steel material and the sacrificial anode panel. With this configuration, the contact between the steel material and the sacrificial anode panel can be made electrically close.

  According to the sacrificial anode panel and the corrosion prevention method using the sacrificial anode panel according to the present invention, the anticorrosion effect can be improved, and the sacrificial anode panel can be easily removed from the steel material to be installed, Maintenance work such as confirmation of the state can be easily performed, and furthermore, it can be easily applied to steel materials in which rust has already occurred.

It is the figure which showed the mode at the time of installation of the sacrificial anode panel of embodiment which concerns on this invention. It is the figure which showed the sacrificial anode panel of embodiment which concerns on this invention. It is the figure which showed the outline of the installation operation | work of the sacrificial anode panel of embodiment which concerns on this invention. It is the figure which showed the outline of the installation operation | work of a sacrificial anode panel at the time of employ | adopting a water absorbing material. It is the figure which showed the mode at the time of installation of the sacrificial anode panel of different embodiment which concerns on this invention. It is the figure which showed the mode at the time of installation of the sacrificial anode panel of different embodiment which concerns on this invention. It is the figure which showed the mode at the time of installation of the sacrificial anode panel of different embodiment which concerns on this invention.

  The sacrificial anode panel according to the embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a state in which the sacrificial anode panel 1 is installed at an end portion of the steel material 6 that is particularly susceptible to corrosion. For example, the steel material 6 generally used for the steel structure is susceptible to corrosion due to corrosion factors such as rainwater, high temperature, high humidity, and salt. The sacrificial anode panel 1 can be installed in a place where rust is likely to occur (it is easy to corrode), and effective corrosion prevention can be realized.

  FIG. 2 shows a flat panel panel 1A which is one embodiment of the sacrificial anode panel 1. FIG. 2A shows the front surface and FIG. 2B shows the back surface (contact surface 10 with the steel material 6). The contact surface 10 of the flat panel panel 1 </ b> A has a plurality of magnets 3 a and a zinc plate 5.

  First, the configuration of the sacrificial anode material body 2 will be described. The sacrificial anode material body 2 is made of a metal material that is electrically less basic than the steel material 6 and has a porous property. Specifically, as the metal material that is electrically base with respect to the steel material 6, zinc, aluminum, magnesium, alloys thereof, pseudo alloys, or the like can be used. Any other metal material can be used in the present invention as long as it is a metal material that is electrically base to the steel material 6.

  Moreover, this sacrificial anode material main body 2 has porosity, for example, is comprised so that it may have a 10 to 40% space | gap with respect to the whole volume. And this space | gap is comprised so that it may have the property (water retention) which can hold | maintain liquids, such as rain water, by a capillary phenomenon. Further, this metal having porosity is sometimes called a powder sintered metal, and is very light and easy to handle.

  The above porosity is preferably higher in consideration of water retention and the like, but if it is too high, it causes problems in manufacturing the sacrificial anode material body 2 and decreases the strength. Therefore, from the balance of strength, water absorption, and water retention. It is desirable to determine the porosity.

  Next, an example of a method for manufacturing the sacrificial anode material body 2 will be described. First, a mixed powder of aluminum or aluminum alloy powder having a center particle size of about 10 to 70 μm and zinc powder having a center particle size of about 10 to 100 μm is used as a starting material. Zinc plate 5 is placed in a mold, mixed powder is filled, and so-called sintering is performed by heating to 250 to 400 ° C. while applying a surface pressure of 5 to 100 MPa, and continuous pores having a relative density in the range of 60 to 90% are obtained. A porous metal material is obtained. Alternatively, a porous body having continuous pores with a relative density in the range of 60 to 90% is obtained by sintering with a heater from 250 to 400 ° C. in a state where a press formed body including a cold isostatic press and the zinc plate 5 are arranged. A metal material having quality is obtained. The production conditions such as the selection of the sintering method and the temperature are preferably selected appropriately depending on the particle size of the raw material powder, the water absorption, hygroscopicity, anticorrosive effect of the sacrificial anode material body, and the amount of the zinc plate 5 installed.

  The sacrificial anode material body 2 is denser than pumice, and at first glance is an image that is not much different from a metal material having no voids.

  Moreover, the zinc plate 5 installed on the back surface of the sacrificial anode material body 2 can delay the deterioration (corrosion) of the flat panel panel 1A itself by positively rusting the zinc plate 5. Furthermore, the sacrificial anode action of the sacrificial anode material body 2 can be improved. The zinc plate 5 can be fixed with an adhesive or the like, and may be fixed when the sacrificial anode material body 2 is molded.

  By installing this zinc plate 5, the life of the flat panel panel 1A as an anticorrosion material can be extended, but if it is installed on the entire surface of the sacrificial anode material body 2, the water absorption and hygroscopicity of rainwater and the like are reduced. Therefore, the anticorrosion effect may be reduced. For this reason, the installation amount of the zinc plate 5 needs to be appropriately determined from the balance between the life of the flat panel panel 1A, and the water absorption and hygroscopicity.

  Moreover, the magnet 3 a shown in FIG. 2B is for fixing the flat panel panel 1 A to the steel material 6. The magnet 3a may be fixed to the sacrificial anode material body 2 with an adhesive or the like, or may be embedded and fixed when the body 2 is molded.

  FIG. 3 shows an operation process for installing the sacrificial anode panel 1 on the steel material 6 on which rust has already been generated. FIG. 3A shows a state in which rust is generated in the steel material 6 and the corroded portion 8 is formed. First, as shown in FIG. 3B, a part of the steel material 6 is polished with a grinder or the like to expose the bare metal of the steel material 6 (polishing step). Here, rust on the surface of the corroded portion 8 is removed, but it is not necessary to completely remove the rust.

  Next, the magnet 3b is fixed to the exposed bare metal with an adhesive or the like (preparation step). Next, as shown in FIG. 3C, the magnet 3b fixed to the steel material 6 and the magnet 3a of the sacrificial anode panel 1 are made to correspond to each other. Finally, as shown in FIG. 3D, the sacrificial anode panel 1 is fixed to the steel material 6 with magnets 3a and 3b (installation step), and the installation of the sacrificial anode panel 1 is completed.

  With this configuration, corrosion protection can be performed without removing all rust. Moreover, since the sacrificial anode panel 1 is installed with the magnets 3a and 3b, the removal becomes easy. During maintenance work, an operator may pull the end of the sacrificial anode panel 1 and the like to visually check the corroded portion 8 and return the sacrificial anode panel 1 to its original position. For this reason, maintenance work becomes easy, it can be performed in a short time, and it becomes easy to check the state of the corroded part 8 regularly. In addition, the sacrificial anode panel 1 that has been partially consumed and deteriorated can be easily replaced.

  Here, an administrator who manages the steel material 6 with a bridge, a plant, or the like needs to grasp the state of rust growth, and no matter how excellent the anticorrosive material is, it cannot be left installed. This is because it is necessary to periodically check the corroded portion 8 and, in some cases, arrange for the steel material 6 to be replaced.

  Here, the work process of installing the sacrificial anode panel 1 on the steel material 6 on which rust has already been described has been described, but the sacrificial anode panel 1 is similarly installed on the steel material 6 on which no rust has been generated. be able to. However, since it is desirable to install the sacrificial anode panel 1 so that the rear surface of the sacrificial anode panel 1 and the steel material 6 are in contact with each other, if there is no corroded portion 8, the magnet 3b is not installed on the steel material 6 and the magnet 3a on the panel 1 side is used. The steel material 6 may be fixed directly. Alternatively, the magnet 3a on the panel 1 side may be deeply embedded in the sacrificial anode material 2, and the magnet 3b on the steel material 6 side may be configured to fit within the panel.

  FIG. 4 shows an embodiment in which a water absorbing material 7 is installed between the steel material 6 and the sacrificial anode panel 1. As shown in FIG. 4A, when installing the water absorbing material 7, an opening 9 is provided in the moisture absorbing and water absorbing material 7 with high water retention, and the magnet 3 b can be penetrated. Then, as shown in FIG. 4B, the water absorbing material 7 is deformed so as to correspond to the unevenness of the corroded portion, the unevenness of the welded portion or the joint portion of the member, and the like.

  Next, the water absorbing material 7 will be described. The water-absorbing material 7 may be any material that is excellent in water retention and moisture retention. For example, the water-absorbing material 7 is configured using a material having moisture absorption and water absorption such as a sheet made of polyvinyl alcohol or a polymer water absorbent gel. Furthermore, it is desirable to have a deformability that deforms following the unevenness of the corroded portion 8 and the welded portion.

  When the sacrificial anode panel 1 is wetted by rainwater or the like due to the configuration in which the water absorbing material 7 is installed, water is retained by the gap of the sacrificial anode material body 2 and the water absorbing material 7, and the steel material 6 is transferred to the sacrificial anode panel 1. It is possible to maintain a state where electricity easily flows. The sacrificial anode material body 2 and the zinc plate 5 are actively rusted by the flow of electricity, so that the anticorrosion effect can be improved. In particular, by making the water absorbing material 7 easily deformable, the state of electrical contact with the corroded portion 8 is improved, and the anticorrosion effect can be improved.

Further, a water absorbing material 7 having a large area may be installed on the sacrificial anode panel 1, and the hygroscopic material 7 may cover the corroded portion 8 in a wide range. With this configuration, corrosion protection can be performed in a wider range than the area of the sacrificial anode panel 1. That is, since electricity flows from the corroded portion 8 in contact with the water absorbing material 7 to the sacrificial anode panel 1 via the water absorbing material 7, an anticorrosive effect can be obtained in a wide range.

  In addition, the sacrificial anode material body 2 can be formed to be thin with respect to the bent portion of the pipe and attached in a sheet shape to prevent corrosion.

  FIG. 5 shows a corner panel 1B which is a sacrificial anode panel 1 of a different embodiment. FIG. 5 shows a state in which a corner panel 1B configured by combining a plate-like portion and two side wall portions is installed so as to cover a corner portion of the steel material 6 and a flat panel panel 1A is installed at the bottom portion. Yes.

  As shown in FIG. 5, the structure in which the corners of the steel material 6 are covered with the flat panel panel 1 </ b> A and the corner panel 1 </ b> B can effectively prevent the corrosion of the corners of the steel material 6, which has been difficult in the past. Become. In addition, since it was difficult for this corner | angular part to ensure the film thickness similar to a smooth part, for example by the anticorrosion by coating, it became a problem as an easily rusted place.

  FIG. 6 shows a cylindrical panel 1C which is a sacrificial anode panel 1 of a different embodiment. FIG. 6 shows a state where a column panel 1C is installed on a columnar steel 6C such as a pipe of a plant. This column panel 1C is composed of a columnar sacrificial anode material body 2C. This column panel 1C also has a magnet 3a on the back surface (contact surface with the steel material 6C), and is configured to be removable from the columnar steel material 6C.

  FIG. 7 shows a bolt cap 1D which is a sacrificial anode panel 1 of a different embodiment. FIG. 7 shows a state in which a bolt cap 1D is installed on a bolt 11 used in a structure or the like. The bolt cap 1D can be manufactured, for example, by sintering metal powder into a cap shape. The bolt 11 can be protected against corrosion by the bolt cap 1D.

  As described above, as the embodiment of the sacrificial anode panel 1 of the present invention, the flat panel panel 1A, the corner panel 1B, the column panel 1C, and the bolt cap 1D have been described, but the present invention is limited to these shapes. Instead, the shape can be appropriately changed and applied to a flange portion or the like for connecting pipes.

  In addition, the corrosive environment of each member and part such as a structure that requires anticorrosion often varies greatly depending on the location. Therefore, the proportion of aluminum, zinc, magnesium, and the like constituting the sacrificial anode material body 2 is determined in consideration of the trade-off relationship between the corrosion resistance and durability of the sacrificial anode material body 2. That is, if the proportion of magnesium is increased and the proportion of zinc is decreased in order to improve the anticorrosion properties, the durability is lowered.

  In addition, the present invention is particularly effective for corrosion protection of weathering steel that does not require painting. This weather-resistant steel is designed to form a protective rust on the surface of the steel, and is often used without painting. However, when it is necessary to carry out anticorrosion such as painting for some reason, the protective rust is high in hardness, so that it is very difficult to perform painting with a grinder.

  On the other hand, in the present invention, it is only necessary to drop the rust only at the place where the magnet 3b is installed. Therefore, the places where polishing work by a grinder or the like is required are limited, and corrosion protection can be performed relatively easily. .

DESCRIPTION OF SYMBOLS 1 Sacrificial anode panel 1A Flat panel 1B Corner panel 1C Column panel 2 Sacrificial anode body 2C Column-shaped body 3a, 3b Magnet 5 Zinc plate 6 Steel material 6C Columnar steel material 7 Water absorption material 8 Corrosion part 9 Opening part 10 Contact surface

Claims (9)

  In a sacrificial anode panel that is installed on a steel material for corrosion protection, the sacrificial anode panel has a sacrificial anode material body and a magnet for fixing the sacrificial anode panel to the steel material, and the sacrificial anode material body is Sacrificial characterized in that it is made of a metal material that is electrically base and porous compared to steel, and the magnet is installed on the contact surface where the sacrificial anode body and the steel are in contact. Anode panel.   The sacrificial anode panel according to claim 1, wherein the sacrificial anode panel is configured to be detachable from the steel material by a magnet installed on the sacrificial anode material body and a magnet fixed to the steel material.   The sacrificial anode panel according to claim 1 or 2, wherein the sacrificial anode material body has a structure capable of absorbing and holding liquid by capillary action.   The said sacrificial anode material main body was shape | molded by sintering of metal powder, and it shape | molded so that the porosity might be 20 to 40%, The Claim 1 characterized by the above-mentioned. Sacrificial anode panel.   The sacrificial anode panel according to any one of claims 1 to 4, wherein the sacrificial anode material body has a zinc plate on a surface opposite to the contact surface of the sacrificial anode material body.   The sacrificial anode material main body has a water absorbing material on the contact surface, and the water absorbing material has a deformability that deforms along irregularities on the surface of the steel material. The sacrificial anode panel according to any one of 1 to 5. A sacrificial anode body composed of a metal material that is electrically base and porous compared to steel; and
A sacrificial anode body and anticorrosive method of steel using a sacrificial anode panel and a magnet installed on a contact surface of the the steel is in contact, a preparation step of fixing the magnet to the steel, and the magnet An anticorrosion method comprising: an installation step of fixing the sacrificial anode panel to the steel material by a magnet fixed to the sacrificial anode panel. A sacrificial anode comprising a sacrificial anode body made of a metal material that is electrically base and porous compared to a steel material, and a magnet installed on a contact surface where the sacrificial anode body and the steel material are in contact with each other a corrosion method of a panel utilizing the steel, a polishing step of exposing the bare metal already polished part of the steel material with a rust, a preparation step of fixing the magnet to the base metal, and the magnet An anticorrosion method comprising: an installation step of fixing the sacrificial anode panel to the steel material by a magnet fixed to the sacrificial anode panel. The water absorbing material installation step of installing a water absorbing material having a deformability that deforms along the irregularities on the surface of the steel material between the steel material and the sacrificial anode panel. Anticorrosion method as described in 4.

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