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JP5947136B2 - Anticorrosive - Google Patents
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JP5947136B2 - Anticorrosive - Google Patents

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JP5947136B2
JP5947136B2 JP2012163961A JP2012163961A JP5947136B2 JP 5947136 B2 JP5947136 B2 JP 5947136B2 JP 2012163961 A JP2012163961 A JP 2012163961A JP 2012163961 A JP2012163961 A JP 2012163961A JP 5947136 B2 JP5947136 B2 JP 5947136B2
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moisture
sacrificial anode
steel
supply sheet
steel material
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JP2014025087A (en
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重信 貝沼
重信 貝沼
修二 石原
修二 石原
大介 内田
大介 内田
彬 兼子
彬 兼子
龍明 住谷
龍明 住谷
孝郎 山内
孝郎 山内
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Kyushu University NUC
Mitsui Engineering and Shipbuilding Co Ltd
Nippon Light Metal Co Ltd
Toyobo Co Ltd
Mitsui E&S Co Ltd
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Kyushu University NUC
Mitsui Engineering and Shipbuilding Co Ltd
Nippon Light Metal Co Ltd
Toyobo Co Ltd
Mitsui E&S Holdings Co Ltd
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Description

この発明は、鋼材の表面に接触して配置される防食材に関する。   This invention relates to the anticorrosion material arrange | positioned in contact with the surface of steel materials.

化学プラントの配管および橋梁等の構造物に使用される鋼材は、大気に含まれる酸素や水分などの腐食成分に曝された状態で長期間にわたって使用され続ける。このため、鋼材の腐食を長期間継続して抑制する技術が求められている。
鋼材の腐食を抑制する技術として、鋼材に塗装を施して鋼材と腐食成分との直接的な接触を妨げる方法が知られている。しかしながら、時間の経過に伴い、例えば気泡の混入した塗装箇所などから劣化が生じて鋼材が大気中の腐食成分に曝されるおそれがあるため、所定の期間毎に塗装状況を点検し、塗装の劣化に応じて塗装を再施工する必要がある。また、塗装を再施工する際には、塗装の劣化が短期間のうちに生じないようにケレンを十分に行わなければならないため、更に手間もコストもかかることとなる。
Steel materials used for structures such as piping and bridges in chemical plants continue to be used for a long period of time while being exposed to corrosive components such as oxygen and moisture contained in the atmosphere. For this reason, the technique which suppresses corrosion of steel materials continuously for a long period of time is calculated | required.
As a technique for suppressing the corrosion of steel materials, a method is known in which the steel materials are coated to prevent direct contact between the steel materials and corrosive components. However, over time, for example, there is a possibility that the steel material may be exposed to corrosive components in the atmosphere due to deterioration from the painted part where air bubbles are mixed. It is necessary to reconstruct the paint according to the deterioration. Further, when repainting the coating, since it is necessary to sufficiently clean the coating so that the coating does not deteriorate in a short period of time, the labor and cost are further increased.

そこで、亜鉛メッキまたは亜鉛ペーストで鋼材を覆うことにより、鋼材と腐食成分との接触を妨げると共に亜鉛が鋼材に対する犠牲陽極となって鋼材の腐食を抑制し、再施工の回数を減少させることが試みられている。例えば、特許文献1では、鋼材の腐食による欠損箇所に亜鉛ペーストを塗布し、その上から亜鉛箔を貼り付けて遮蔽することで、鋼材を局所的に防食する方法が開示されている。   Therefore, by covering the steel with galvanized or zinc paste, the contact between the steel and the corrosive component is prevented, and zinc acts as a sacrificial anode for the steel to suppress the corrosion of the steel and reduce the number of reworks. It has been. For example, Patent Document 1 discloses a method for locally preventing corrosion of steel by applying zinc paste to a defective portion due to corrosion of the steel, and attaching and shielding a zinc foil thereon.

特開2005−60803号公報Japanese Patent Laying-Open No. 2005-60803

特許文献1に記載されている方法により鋼材を防食することができるが、鋼材に亜鉛ペーストを塗布する場合にも、施行面にケレンを十分に行う必要がある。   Although the steel material can be anticorrosive by the method described in Patent Document 1, it is necessary to sufficiently perform keren on the enforcement surface even when a zinc paste is applied to the steel material.

そこで、この発明は、このような従来の問題点を解消し、鋼材に十分なケレンを施さなくても長期間にわたって鋼材の表面における防食を維持することができる防食材を提供することを目的とする。   Accordingly, the object of the present invention is to provide an anticorrosion material that can eliminate such conventional problems and maintain the anticorrosion on the surface of the steel material over a long period of time without applying sufficient keren to the steel material. To do.

この発明に係る防食材は、鋼材の表面に接触して配置される防食材であって、親水性官能基を有する繊維を含み、繊維間及び繊維中において保持された水分により、前記鋼材の表面を湿潤環境にする水分供給シートと、前記水分供給シートの前記鋼材と対向する表面及び前記水分供給シート内に配置され、前記水分供給シートにより湿潤環境にされた前記鋼材の表面と接触して前記鋼材に対する犠牲陽極となる犠牲陽極材とを備えたものである。 The anticorrosion material according to the present invention is an anticorrosion material arranged in contact with the surface of the steel material, including a fiber having a hydrophilic functional group, and the surface of the steel material due to moisture retained in and between the fibers. a water supplying sheets to a wet environment, is disposed in front Symbol water supplying sheets the steel facing the surface and the water supply in the sheet of contact with the moist environment has been the steel surface by the water supplying sheet A sacrificial anode material serving as a sacrificial anode for the steel material is provided.

ここで、前記親水性官能基を有する繊維は、架橋構造と1〜12mmol/gのカルボキシル基量を有することができる。 Here, the fibers having a pre-Symbol hydrophilic functional groups may have a carboxyl group content of the crosslinked structure and 1~12mmol / g.

また、前記犠牲陽極材は前記水分供給シートの表面、及び内部に配置された複数の金属片、(または、水分供給シートの表面に配置され、鋼板と導線により接続された穴の空いた金属板)からなり、それぞれの金属片の間隙(または、金属板の穴)を介して前記水分供給シートにより前記鋼材の表面を湿潤環境にすることが好ましい。また、前記複数の金属片は、前記水分供給シートの表面に樹脂製の固着剤により固定されてもよい。
また、前記犠牲陽極材はニードルパンチにより前記水分供給シートの表面に固定された金属箔からなり、ニードルパンチにより前記犠牲陽極材に形成された貫通孔を介して前記水分供給シートから前記鋼材の表面に水分が供給されることが好ましい。
Further, the sacrificial anode material is a surface of the moisture supply sheet and a plurality of metal pieces arranged inside (or a metal plate with holes provided on the surface of the moisture supply sheet and connected to the steel plate by a conductive wire. It is preferable that the surface of the steel material is brought into a moist environment by the moisture supply sheet through a gap (or a hole in the metal plate) between the metal pieces. The plurality of metal pieces may be fixed to the surface of the moisture supply sheet with a resinous adhesive.
The sacrificial anode material is made of a metal foil fixed to the surface of the moisture supply sheet by needle punching, and the surface of the steel material from the moisture supply sheet through a through hole formed in the sacrificial anode material by needle punching. It is preferable that moisture is supplied to the water.

また、前記犠牲陽極材は、アルミニウム、亜鉛、マグネシウム、またはこれらを含む合金からなることができる。
また、前記水分供給シートは、前記鋼材の表面の形状に応じて撓むような可撓性を有してもよい。
The sacrificial anode material may be made of aluminum, zinc, magnesium, or an alloy containing these.
Moreover, the said water supply sheet | seat may have flexibility which bends according to the shape of the surface of the said steel material.

この発明によれば、鋼材の表面を湿潤環境にする水分供給シートの表面及び内部に鋼材に対する犠牲陽極となる犠牲陽極材を配置するため、鋼材に十分なケレンを施さなくても長期間にわたって鋼材の表面における防食を維持することができる。   According to the present invention, since the sacrificial anode material serving as a sacrificial anode for the steel material is disposed on the surface and inside of the moisture supply sheet that makes the surface of the steel material a moist environment, the steel material can be used over a long period of time without sufficient kelen being applied to the steel material. The anticorrosion on the surface of the can be maintained.

この発明の実施形態1に係る防食材の構成を示す断面図である。It is sectional drawing which shows the structure of the anticorrosion material which concerns on Embodiment 1 of this invention. 鋼材の表面に配置された防食材を示す図である。It is a figure which shows the anti-corrosion material arrange | positioned on the surface of steel materials. 腐食のメカニズムを説明するための図である。It is a figure for demonstrating the mechanism of corrosion. この発明の実施形態1に係る防食材による犠牲陽極を用いた防食作用を説明するための図である。It is a figure for demonstrating the anti-corrosion effect | action using the sacrificial anode by the anti-corrosion material which concerns on Embodiment 1 of this invention. 実施形態1の変形例に係る防食材の構成を示す断面図である。It is sectional drawing which shows the structure of the anticorrosion material which concerns on the modification of Embodiment 1. 実施形態1の他の変形例に係る防食材の構成を示す断面図である。It is sectional drawing which shows the structure of the anticorrosion material which concerns on the other modification of Embodiment 1. この発明の実施形態2に係る防食材を鋼材の表面に配置した図である。It is the figure which has arrange | positioned the anticorrosion material which concerns on Embodiment 2 of this invention on the surface of steel materials. この発明の他の実施形態に係る防食材を鋼材の表面に配置した図である。It is the figure which has arrange | positioned the anticorrosion material which concerns on other embodiment of this invention on the surface of steel materials.

以下に、添付の図面に示す好適な実施形態に基づいて、この発明を詳細に説明する。   Hereinafter, the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.

実施形態1
図1に、この発明の実施形態1に係る防食材の構成を示す。この防食材は、鋼材の表面に接触して配置されるものである。
また、この防食材は、水分を保持する繊維素材からなると共に保持された水分を鋼材の表面に供給することで鋼材表面を湿潤環境におく水分供給シート1と、水分供給シート1の鋼材と対向する表面2に配置される犠牲陽極材3とを備えるように形成されている。
防食材は、図2に示すように、犠牲陽極材3が鋼材Sの表面に接触するように配置される。この配置により、犠牲陽極材3は、水分供給シート1により湿潤環境におかれた鋼材Sの表面と接触し、鋼材Sに対する犠牲陽極として機能する。
Embodiment 1
In FIG. 1, the structure of the anticorrosion material which concerns on Embodiment 1 of this invention is shown. This anticorrosion material is disposed in contact with the surface of the steel material.
Further, the anticorrosive material is made of a fiber material that retains moisture, and supplies the retained moisture to the surface of the steel material so that the surface of the steel material is placed in a wet environment, and the steel material of the moisture supply sheet 1 is opposed to the steel material. And a sacrificial anode material 3 disposed on the surface 2 to be formed.
The anticorrosive material is disposed so that the sacrificial anode material 3 contacts the surface of the steel material S as shown in FIG. With this arrangement, the sacrificial anode material 3 comes into contact with the surface of the steel material S placed in a wet environment by the moisture supply sheet 1 and functions as a sacrificial anode for the steel material S.

水分供給シート1は、繊維素材が平面状に構成されたものであり、例えば、布、紙、編織物、および不織布などが用いられる。また、水分供給シートを作製する方法としては、例えば不織布の場合、ニードルパンチ、サーマルボンド、ケミカルボンド等の方法が採用されるが、本発明の防食材が、犠牲防食を作用しうる限りにおいては、水分供給シートの形態、その作製方法については、制限されるものではない。更に、水分供給シート1は、親水性官能基を有する繊維を含む。これにより、水分供給シート1は、繊維間および繊維内に水分を保持することができる。
親水性官能基を有する繊維は、繊維中、また繊維表面に、−SO3H、−COOH、−NH、−CONH、−CHO、−SH、−OH、などの親水性官能基を有しており、繊維中、あるいは繊維間に水分を保持する。親水性官能基を有する繊維としては、レーヨン、綿、ビニロン、ナイロン、羊毛、アクリレートなどが挙げられるが、親水性官能基が付加されていればよく、本発明の防食材が防食性能を有する範囲においては、特に限定されない。
The moisture supply sheet 1 is made of a flat fiber material. For example, cloth, paper, knitted fabric, and non-woven fabric are used. In addition, as a method for producing the moisture supply sheet, for example, in the case of a nonwoven fabric, a method such as needle punching, thermal bonding, chemical bonding, etc. is adopted, as long as the anticorrosive material of the present invention can act on sacrificial anticorrosion. The form of the moisture supply sheet and the production method thereof are not limited. Furthermore, the moisture supply sheet 1 includes a fiber having a hydrophilic functional group. Thereby, the moisture supply sheet 1 can hold moisture between the fibers and in the fibers.
Fibers having a hydrophilic functional group, in the fiber, also on the fiber surface, have -SO3H, -COOH, -NH 3, -CONH 2, -CHO, -SH, -OH, a hydrophilic functional group such as And retains moisture in or between the fibers. Examples of the fiber having a hydrophilic functional group include rayon, cotton, vinylon, nylon, wool, and acrylate. However, the hydrophilic functional group may be added, and the anticorrosive material of the present invention has an anticorrosive performance. There is no particular limitation in the case.

犠牲陽極材3は、複数の金属片からなり、少なくとも水分供給シート1の表面2に散在して固着剤により固着されている。犠牲陽極材3を構成する各金属片は、鋼材Sよりもイオン化傾向の強い金属からなり、例えば、アルミニウム、亜鉛、マグネシウム、またはこれらを含む合金から構成される。また、鋼材Sが、一般的な炭素鋼またはステンレス鋼からなる場合、犠牲陽極材3を構成する各金属片は、アルミニウム合金であることが好ましい。さらに、アルミニウム合金は、電流効率を向上させるために、亜鉛、インジウム、錫、マグネシウム、カルシウム、マンガン、チタン、ベリリウム、ストロンチウム、カドミウム、ケイ素、ジルコニウム及びガリウムのいずれかを含むことが好ましい。また、金属片としては、切り子、粉末、または小片などが利用できる。
また、犠牲陽極材3を水分供給シート1に固着させる固着剤としては、例えばポリビニルアルコール(PVA)などの樹脂製のものが利用できるが、さらに導電性を有するものを用いるのが好ましい。
The sacrificial anode material 3 is composed of a plurality of metal pieces and is scattered at least on the surface 2 of the moisture supply sheet 1 and fixed by a fixing agent. Each metal piece constituting the sacrificial anode material 3 is made of a metal having a stronger ionization tendency than the steel material S, and is made of, for example, aluminum, zinc, magnesium, or an alloy containing these. Moreover, when the steel material S consists of general carbon steel or stainless steel, it is preferable that each metal piece which comprises the sacrificial anode material 3 is an aluminum alloy. Further, the aluminum alloy preferably contains any of zinc, indium, tin, magnesium, calcium, manganese, titanium, beryllium, strontium, cadmium, silicon, zirconium and gallium in order to improve current efficiency. Moreover, as a metal piece, a face, a powder, or a small piece can be utilized.
Moreover, as a fixing agent for fixing the sacrificial anode material 3 to the moisture supply sheet 1, for example, a resin-made material such as polyvinyl alcohol (PVA) can be used, but it is preferable to use a conductive material.

次に、このような防食材により鋼材Sの腐食を抑制する方法について説明する。
一般的に、金属材料の腐食は、金属材料中の原子が水分(電解質水溶液)中に陽イオンとして溶け出すアノード反応(酸化反応)と、酸化剤が電子を受け取るカソード反応(還元反応)が対をなして同時におこる現象である。
Next, a method for suppressing the corrosion of the steel material S with such an anticorrosive material will be described.
In general, corrosion of a metal material is a combination of an anode reaction (oxidation reaction) in which atoms in the metal material dissolve as cations in water (aqueous electrolyte solution) and a cathode reaction (reduction reaction) in which an oxidant receives electrons. It is a phenomenon that occurs simultaneously.

例えば、図3に示されるような鉄板上の水滴(中性)により腐食が発生する場合は、下記のように2つの反応がおこる。
まず、相対的に水滴が厚く酸素濃度が低い水滴中央部の鉄板上では、次式(1)のようなアノード反応(酸化反応)がおこり、鉄原子Feは、鉄板に電子eを残し、第一鉄イオンFe2+の形で溶解し、水滴中に拡散する。
Fe→Fe2++2e (1)
一方、水滴中の酸素濃度の高い所では、次式(2)のようなカソード反応(還元反応)がおこり、水HO、酸素O及び鉄溶解部から供給される電子eが反応し水酸化物イオンOHを生じる。
O+O/2+2e→2OH (2)
For example, when corrosion occurs due to water droplets (neutral) on an iron plate as shown in FIG. 3, two reactions occur as follows.
First, on the iron plate in the center of the water droplet having a relatively thick water droplet and a low oxygen concentration, an anode reaction (oxidation reaction) such as the following formula (1) occurs, and the iron atom Fe leaves an electron e on the iron plate, Dissolves in the form of ferrous ions Fe 2+ and diffuses into the water droplets.
Fe → Fe 2+ + 2e (1)
On the other hand, in a place where the oxygen concentration in the water droplet is high, a cathode reaction (reduction reaction) as in the following formula (2) occurs, and water H 2 O, oxygen O 2, and electrons e supplied from the iron dissolving part react. This produces the hydroxide ion OH .
H 2 O + O 2/2 + 2e - → 2OH - (2)

そこで、図4に示されるように、実施形態1においては、親水性官能基を有する繊維を含む水分供給シート1の表面2に、鋼材Sに対する犠牲陽極となる複数の金属片、すなわち、防食の対象となる鋼材Sよりも電位の低い卑な金属片からなる犠牲陽極材3を固着した防食材が、鋼材Sの表面に接触して貼り付けられる。   Therefore, as shown in FIG. 4, in the first embodiment, a plurality of pieces of metal serving as a sacrificial anode for the steel material S on the surface 2 of the moisture supply sheet 1 including fibers having a hydrophilic functional group, that is, anticorrosion. An anticorrosion material to which the sacrificial anode material 3 made of a base metal piece having a lower potential than the target steel material S is fixed is brought into contact with the surface of the steel material S.

鋼材Sに貼り付けられた防食材の外部から雨などによる水分が水分供給シート1に浸透され、所定量の水分が繊維間および繊維中で保持される。この時、水分供給シート1の繊維間のみで水分を保持した場合には、その保持された水分は短期間のうちに消失してしまうが、高い水分保持能を有する親水性官能基を有する繊維が水分保持を担うことで、水分供給シート1は長期間にわたって所定の水分量を保持することができる。また、吸湿性の高い親水性官能基を導入した繊維を用いた場合には、外部から直接的に雨水等が供給されない環境においても水分供給シート1は所定の水分量を保つことができる。
水分供給シート1の繊維中及び繊維間で保持された水分は、犠牲陽極材3と鋼材Sの表面の間を湿潤環境にする。このようにして、水分供給シート1により、鋼材Sの表面と犠牲陽極材3の間に水分が保持され、鋼材Sの表面が湿潤環境に維持される。これにより、犠牲陽極材3と鋼材Sの表面との間には長期間にわたって水分が存在するため、それら材料間には継続して電位差が生じ、犠牲陽極材3側では、アノード反応が起こり、鋼材Sの表面では、カソード反応が起こる。すなわち、鋼材Sの表面が湿潤環境に維持されることにより、腐食反応を継続して犠牲陽極材3にもたせ、その間は鋼材Sに電子eが供給されるので、その結果、鋼材Sの表面には、長期間にわたって腐食が発生しない。
Moisture due to rain or the like is infiltrated into the moisture supply sheet 1 from the outside of the anticorrosive material affixed to the steel material S, and a predetermined amount of moisture is retained between and in the fibers. At this time, when moisture is retained only between the fibers of the moisture supply sheet 1, the retained moisture disappears within a short period of time, but the fibers having a hydrophilic functional group having a high moisture retention ability. As a result, the moisture supply sheet 1 can hold a predetermined amount of moisture over a long period of time. Moreover, when the fiber which introduce | transduced the hydrophilic functional group with high hygroscopicity is used, the water | moisture-content supply sheet 1 can maintain predetermined | prescribed moisture content also in the environment where rainwater etc. are not supplied directly from the outside.
The moisture retained in and between the fibers of the moisture supply sheet 1 creates a moist environment between the sacrificial anode material 3 and the surface of the steel material S. In this way, moisture is retained between the surface of the steel material S and the sacrificial anode material 3 by the moisture supply sheet 1, and the surface of the steel material S is maintained in a moist environment. Thereby, since moisture exists between the sacrificial anode material 3 and the surface of the steel material S over a long period of time, a potential difference is continuously generated between the materials, and on the sacrificial anode material 3 side, an anode reaction occurs, On the surface of the steel material S, a cathode reaction occurs. That is, by maintaining the surface of the steel material S in a moist environment, the corrosion reaction is continued and applied to the sacrificial anode material 3, and during that time, the electron e is supplied to the steel material S. As a result, the surface of the steel material S No corrosion occurs over a long period of time.

このように、水分保持能が高められた水分供給シート1により鋼材Sの表面と犠牲陽極材3の間における湿潤環境が維持されるため、長期間継続して鋼材Sの腐食を抑制することができる。また、塗装のように鋼材と腐食成分との接触を遮断することで防食する方法とは異なり、犠牲陽極材3の一部が鋼材Sと接触していればよく、鋼材Sに十分なケレンを施すことなく鋼材Sの腐食を抑制することができる。
なお、水分供給シート1は、乾燥がしにくい程好ましい。これにより、長期間水分が供給されない場合、鋼材Sの表面に供給する水分が枯渇して鋼材Sと犠牲陽極材3が絶縁することを防止し、鋼材Sの腐食を長期間にわたって抑制することができる。
Thus, since the moisture environment between the surface of the steel material S and the sacrificial anode material 3 is maintained by the water supply sheet 1 with improved water retention capacity, corrosion of the steel material S can be suppressed continuously for a long period of time. it can. Moreover, unlike the method of preventing corrosion by blocking the contact between the steel material and the corrosive component as in the case of coating, it is sufficient that a part of the sacrificial anode material 3 is in contact with the steel material S. The corrosion of the steel material S can be suppressed without applying.
In addition, the moisture supply sheet 1 is so preferable that it is hard to dry. Thereby, when moisture is not supplied for a long time, the moisture supplied to the surface of the steel material S is prevented from being depleted and the steel material S and the sacrificial anode material 3 are prevented from being insulated, and corrosion of the steel material S can be suppressed for a long time. it can.

加えて、水分供給シートに含ませる親水性官能基を有する繊維の水分保持率は、0.4〜3.0で、この親水性官能基を有する繊維を10%以上水分供給シート1に含ませることが好ましい。例えば、水分保持率1.6の繊維を30%使用した水分供給シート1では、その水分保持率が0.6となり、水分供給シート1に水分を長期間にわたって安定的に保持させることができる。
すなわち、親水性官能基を有する繊維の水分保持率が、0.4未満であると、水分供給シート1に10%以上の親水性官能基を有する繊維を含有させた場合でも、水分供給シート1の水分保持率が低下し、かつ、親水性官能基を有する繊維から由来する長期間の水分保持性が発揮されず、結果的に水分供給シート1に長期間の水分が保持できない。
反対に、3.0以上の水分保持率を備えた親水性官能基を有する繊維を水分供給シート1に10%以上含ませた場合には、水分供給シート1が水分を飽和状態まで含んだ時と、乾燥した時の体積変化が大きくなり、鋼材Sと犠牲陽極材3が絶縁するおそれがある。また、水分保持率が高いと、供給される水分が少ない場合には、水分供給シート1の一部のみで水分が保持され、水分供給シート1全体に水分が供給されず、水分が十分でないところでは、防食できない。さらに、水分保持率が高いと、繊維物性が長期使用時に悪化し、繊維の水分保持率の低下、ひいては、水分供給シート1自体の水分保持能の低下を引き起こすと共に、水分供給シート1の形態保持性の悪化等の問題により長期の使用に耐えうるものではなくなる。
ここで、水分保持率は、熱風乾燥機を用いて水分供給シート1、もしくは、繊維を温度105℃で3時間乾燥した後の重量をX(g)とし、イオン交換水に30分間浸漬して取り出した後、190G、5分間遠心脱水した後の重量をYgとすると、(Y/X)−1で表される。
In addition, the moisture retention rate of the fiber having a hydrophilic functional group to be included in the moisture supply sheet is 0.4 to 3.0, and the fiber having the hydrophilic functional group is included in the moisture supply sheet 1 by 10% or more. It is preferable. For example, in the moisture supply sheet 1 using 30% of fibers having a moisture retention rate of 1.6, the moisture retention rate is 0.6, and the moisture supply sheet 1 can stably retain moisture over a long period of time.
That is, when the moisture retention rate of the fiber having a hydrophilic functional group is less than 0.4, even when the fiber having 10% or more of the hydrophilic functional group is contained in the moisture supply sheet 1, the moisture supply sheet 1 The moisture retention rate of the water supply sheet 1 is reduced, and the long-term moisture retention derived from the fiber having a hydrophilic functional group is not exhibited, and as a result, the moisture supply sheet 1 cannot retain moisture for a long period of time.
On the contrary, when 10% or more of fibers having a hydrophilic functional group having a water retention rate of 3.0 or more are included in the water supply sheet 1, the water supply sheet 1 contains water to a saturated state. And the volume change when it dries becomes large, and there exists a possibility that the steel material S and the sacrificial anode material 3 may insulate. In addition, when the moisture retention rate is high, when the supplied moisture is small, the moisture is retained by only a part of the moisture supply sheet 1, the moisture is not supplied to the entire moisture supply sheet 1, and the moisture is not sufficient. Is not anticorrosive. Furthermore, when the moisture retention rate is high, the fiber physical properties deteriorate during long-term use, causing a decrease in the moisture retention rate of the fibers, and hence the moisture retention capability of the moisture supply sheet 1 itself, and maintaining the form of the moisture supply sheet 1. Due to problems such as deterioration of sex, it will not be able to withstand long-term use.
Here, the moisture retention rate is set to X (g) after drying the moisture supply sheet 1 or the fiber at a temperature of 105 ° C. for 3 hours using a hot air dryer, and immersed in ion-exchanged water for 30 minutes. When the weight after centrifugal dehydration at 190G for 5 minutes after taking out is Yg, it is represented by (Y / X) -1.

次に、親水性官能基が導入された繊維の一例としてアクリレート繊維の内容を示す。
アクリレート繊維は、例えば特開2003−089971に記載されるように、アクリル系繊維を薬剤処理することにより得られる。
処理前の出発アクリル系繊維としてはアクリロニトリル(AN)系重合体により形成された繊維であり、本発明に使用する繊維構造体が作製することができる範囲で、短繊維、トウ、糸、編織物、不織布等の形態のものを用いることができる。
Next, the content of the acrylate fiber is shown as an example of the fiber into which the hydrophilic functional group is introduced.
The acrylate fiber is obtained by chemical treatment of acrylic fiber as described in, for example, JP-A-2003-089971.
The starting acrylic fiber before the treatment is a fiber formed from an acrylonitrile (AN) polymer, and within the range in which the fiber structure used in the present invention can be produced, short fiber, tow, yarn, knitted fabric A non-woven fabric or the like can be used.

ここで、AN系重合体は、AN単独重合体、ANと他の単量体との共重合体のいずれでも良い。ANと共重合する単量体としては、(メタ)アクリル酸メチル、(メタ)アクリル酸エチル、(メタ)アクリル酸ブチル、(メタ)アクリル酸ジメチルアミノエチル、(メタ)アクリル酸ジエチルアミノエチル等の(メタ)アクリル酸エステル単量体、メタリルスルホン酸、p−スチレンスルホン酸等のスルホン酸基含有単量体、及びその塩、酢酸ビニル、プロピオン酸ビニル、酪酸ビニル等のビニル単量体、(メタ)アクリル酸、スチレン、等が挙げられる。尚、(メタ)を付した表記は、アクリル酸,メタアクリル酸の双方を表わしている。   Here, the AN polymer may be either an AN homopolymer or a copolymer of AN and another monomer. Examples of monomers copolymerized with AN include methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, dimethylaminoethyl (meth) acrylate, and diethylaminoethyl (meth) acrylate. (Meth) acrylic acid ester monomers, sulfonic acid group-containing monomers such as methallylsulfonic acid and p-styrenesulfonic acid, and salts thereof, vinyl monomers such as vinyl acetate, vinyl propionate and vinyl butyrate, (Meth) acrylic acid, styrene, etc. are mentioned. In addition, the description which attached | subjected (meth) represents both acrylic acid and methacrylic acid.

このようなアクリル系繊維は、まず、ヒドラジン系化合物により架橋導入処理が施され、アクリル系繊維の溶剤では最早溶解されないものとなるという意味で架橋が形成され、同時に結果として窒素含有量の増加が起きるが、その手段は特に限定されるものではない。この処理による窒素含有量の増加は、1.0〜10重量%の範囲内とするのが好ましいが、窒素含有量の増加が0.1〜1.0重量%であっても、本繊維が本発明に使用する繊維構造体を構成するものであれば採用し得る。なお、窒素含有量の増加を1.0〜10重量%に調整し得る手段としては、ヒドラジン系化合物の濃度5〜60重量%の水溶液中に、アクリル系繊維を温度50〜120℃で5時間以内で処理する手段が工業的に好ましい。ここで、窒素含有量の増加とは、出発アクリル系繊維の窒素含有率(重量%)と、ヒドラジン系化合物による架橋が導入されたアクリル系繊維の窒素含有率(重量%)との差をいう。架橋導入処理による窒素含有量の増加が1.0重量%未満では、後の加水分解処理後に得られた繊維の水に対する膨潤が大きくなり、本繊維を有する構造体としては水分保持率の点から有利になるが、繊維物性が低くなり易い。   Such an acrylic fiber is first subjected to a cross-linking introduction treatment with a hydrazine compound, and a cross-linking is formed in the sense that it is no longer dissolved in the solvent of the acrylic fiber, and at the same time, an increase in the nitrogen content results. Although it occurs, the means is not particularly limited. The increase in nitrogen content by this treatment is preferably in the range of 1.0 to 10% by weight, but even if the increase in nitrogen content is 0.1 to 1.0% by weight, Any fiber structure may be employed as long as it constitutes the fiber structure used in the present invention. In addition, as means for adjusting the increase in nitrogen content to 1.0 to 10% by weight, acrylic fiber is placed in an aqueous solution of hydrazine compound at a concentration of 5 to 60% by weight at a temperature of 50 to 120 ° C. for 5 hours. The means of processing within is industrially preferred. Here, the increase in nitrogen content refers to the difference between the nitrogen content (% by weight) of the starting acrylic fiber and the nitrogen content (% by weight) of the acrylic fiber into which crosslinking with the hydrazine compound has been introduced. . If the increase in the nitrogen content by the cross-linking introduction treatment is less than 1.0% by weight, the swelling of the fiber obtained after the subsequent hydrolysis treatment with respect to water increases, and the structure having this fiber is from the point of moisture retention This is advantageous, but the fiber properties tend to be low.

ここに使用するヒドラジン系化合物としては、特に限定はなく、水加ヒドラジン、硫酸ヒドラジン、塩酸ヒドラジン、臭素酸ヒドラジン、ヒドラジンカーボネート等、この他エチレンジアミン、硫酸グアニジン、塩酸グアニジン、リン酸グアニジン、メラミン等のアミノ基を複数含有する化合物が例示される。   The hydrazine-based compound used here is not particularly limited, and includes hydrazine hydrate, hydrazine sulfate, hydrazine hydrochloride, hydrazine bromate, hydrazine carbonate, and the like, as well as ethylenediamine, guanidine sulfate, guanidine hydrochloride, guanidine phosphate, melamine, and the like. Examples include compounds containing a plurality of amino groups.

かかるヒドラジン系化合物による架橋導入処理工程を経た繊維は、次いでなされる加水分解に先立ち酸化処理Aを施しても良い。酸化処理を行うことで、吸湿速度が向上し、大気中での犠牲防食に有利に働く。ここに使用する酸化剤としては、過硫酸アンモニウム、過硫酸カリウム、過酸化水素水等が挙げられるが特に限定されない。該酸化処理の条件としては、特に限定されないが、大概濃度1〜20重量%、好ましくは2〜10重量%の水溶液に、温度50〜110℃で0.5〜5時間被処理繊維を浸漬するといった例が挙げられる。   The fiber that has undergone the crosslinking and introducing treatment step with such a hydrazine-based compound may be subjected to an oxidation treatment A prior to the subsequent hydrolysis. By performing the oxidation treatment, the moisture absorption rate is improved, which is advantageous for sacrificial corrosion prevention in the atmosphere. Examples of the oxidizing agent used here include ammonium persulfate, potassium persulfate, and hydrogen peroxide, but are not particularly limited. The conditions for the oxidation treatment are not particularly limited, but the fibers to be treated are immersed in an aqueous solution having a concentration of generally 1 to 20% by weight, preferably 2 to 10% by weight, at a temperature of 50 to 110 ° C. for 0.5 to 5 hours. Examples are given.

ヒドラジン系化合物による架橋導入処理工程を経た繊維、或いは酸化処理Aを経た繊維は、続いて酸の水溶液又はアルカリ性金属塩水溶液により加水分解される。この処理により、出発アクリル系繊維に対するヒドラジン系化合物処理による架橋導入処理に関与せずに残留しているCN基、及び架橋処理工程後酸処理Aを施した場合には残留しているCN基と一部酸処理で加水分解されたCONH基の加水分解が進められる。これらの基は加水分解によりカルボキシル基 −COOを形成するが、使用している薬剤がアルカリ性金属塩である場合は、金属塩型カルボキシル基(−COOM、Mは金属を表わす)を、酸を用いた場合はH型カルボキシル基(−COOH)を生成している。ここで使用する酸としては、硝酸、硫酸、塩酸等の鉱酸の水溶液、有機酸等が挙げられ、アルカリ性金属塩としては、アルカリ金属水酸化物、アルカリ土類金属水酸化物、アルカリ金属炭酸塩等が挙げられる。加水分解を行う程度は、生成するカルボキシル基(−COO)の量で表現して1〜12mmol/gの範囲であり、これを達成する手段として、使用する酸又はアルカリ性金属塩の濃度は特に限定されないが、1〜10重量%さらに好ましくは0.5〜5重量%の水溶液中、温度50〜120℃で0.5〜5時間で処理する手段が工業的、繊維物性的にも好ましい。 The fiber that has undergone the cross-linking introduction treatment step with the hydrazine-based compound or the fiber that has undergone the oxidation treatment A is subsequently hydrolyzed with an aqueous acid solution or an aqueous alkaline metal salt solution. By this treatment, the CN group remaining without being involved in the cross-linking introduction treatment by the hydrazine-based compound treatment on the starting acrylic fiber, and the residual CN group when the acid treatment A is applied after the cross-linking treatment step, The hydrolysis of the CONH 2 group partially hydrolyzed by acid treatment proceeds. These groups carboxyl group -COO by hydrolysis - to form a but, if drugs are used is an alkali metal salt, a metal salt type carboxyl groups (-COOM, M represents a metal), the acid When used, an H-type carboxyl group (—COOH) is generated. Examples of the acid used here include aqueous solutions of mineral acids such as nitric acid, sulfuric acid, and hydrochloric acid, and organic acids. Examples of alkaline metal salts include alkali metal hydroxides, alkaline earth metal hydroxides, and alkali metal carbonates. Examples include salts. The degree of hydrolysis is in the range of 1 to 12 mmol / g expressed in terms of the amount of carboxyl group (—COO ) to be produced. As a means for achieving this, the concentration of the acid or alkaline metal salt used is particularly Although not limited, means for treating in an aqueous solution of 1 to 10% by weight, more preferably 0.5 to 5% by weight, at a temperature of 50 to 120 ° C. for 0.5 to 5 hours is preferred from the industrial and fiber properties viewpoints.

かくして加水分解を経た繊維のカルボキシル基の型は、用いた薬剤に依存してH型カルボキシル基又は金属塩型カルボキシル基になっており、一般に水分保持率については金属塩型である方が高い。本発明においてカルボキシル基が1mmol/g以上必要であるというのは、これ未満の量ではその全量を金属塩型としても、繊維自体の水分保持率が0.4に至らず、大気中での犠牲防錆を実現するのに十分とはいえない。   Thus, the type of the carboxyl group of the fiber that has undergone hydrolysis is an H-type carboxyl group or a metal salt-type carboxyl group depending on the chemical used, and the water retention rate is generally higher in the metal salt type. In the present invention, the carboxyl group is required to be 1 mmol / g or more. If the amount is less than this, even if the entire amount is made into a metal salt type, the moisture retention rate of the fiber itself does not reach 0.4, and it is sacrificed in the atmosphere. It is not enough to achieve rust prevention.

このようにして、水分保持率が0.4〜3.0のアクリレート繊維を作成することができ、このアクリレート繊維を10%以上含むように構成して水分供給シート1を作成することができる。   In this way, acrylate fibers having a moisture retention of 0.4 to 3.0 can be produced, and the moisture supply sheet 1 can be produced by constituting the acrylate fibers so as to contain 10% or more.

なお、上記の実施形態では、犠牲陽極材3が水分供給シート1の表面2に配置されたが、犠牲陽極材3は、鋼材Sと接触して鋼材Sに対する犠牲陽極として機能するように、少なくとも水分供給シート1の表面2に配置されていればよく、これに限るものではない。例えば、図5に示すように、犠牲陽極3を水分供給シート1の表面2および内部に配置することができる。また、図6に示すように、犠牲陽極3を水分供給シート1の表面2から裏面2aにわたって配置することもできる。   In the above embodiment, the sacrificial anode material 3 is disposed on the surface 2 of the moisture supply sheet 1, but the sacrificial anode material 3 is in contact with the steel material S and functions as a sacrificial anode for the steel material S at least. It should just be arrange | positioned at the surface 2 of the water | moisture-content supply sheet 1, and is not restricted to this. For example, as shown in FIG. 5, the sacrificial anode 3 can be disposed on the surface 2 and inside the moisture supply sheet 1. Moreover, as shown in FIG. 6, the sacrificial anode 3 can also be arrange | positioned from the surface 2 of the moisture supply sheet 1 to the back surface 2a.

また、犠牲陽極材3を構成する複数の金属片は、水分供給シート1の表面2に一様に散在されているのが好ましい。これにより、複数の金属片が鋼材Sに一様に接触されるため、鋼材Sの腐食を安定して抑制することができる。
また、犠牲陽極材3を構成する各金属片は、水分供給シート1の内部及び表面2に固着剤で固着することなく、その一部を水分供給シート1の繊維と絡めることで水分供給シート1の内部及び表面2に支持させることができる。これにより、水分供給シート1と鋼材S表面を円滑に湿潤状態にすることができる。
Moreover, it is preferable that the plurality of metal pieces constituting the sacrificial anode material 3 are uniformly scattered on the surface 2 of the moisture supply sheet 1. Thereby, since a some metal piece contacts the steel material S uniformly, the corrosion of the steel material S can be suppressed stably.
In addition, each metal piece constituting the sacrificial anode material 3 is not fixed to the inside and the surface 2 of the moisture supply sheet 1 with a fixing agent, but a part thereof is entangled with the fibers of the moisture supply sheet 1 to thereby hydrate the moisture supply sheet 1. Can be supported on the inside and on the surface 2. Thereby, the moisture supply sheet 1 and the steel material S surface can be made into a moist state smoothly.

実施形態2
上記実施形態1に係る防食材は、犠牲陽極材として複数の金属片を用いているが、この発明は、水分供給シートにより、鋼材の表面を湿潤環境にし、犠牲陽極材が鋼材に対する犠牲陽極として機能すればよく、例えば図7に示すような金属箔からなる犠牲陽極材4を有する防食材であってもよい。
犠牲陽極材4は、ニードルパンチにより水分供給シート1の表面2に固定されている。水分供給シート1からの水分は、ニードルパンチにより犠牲陽極材4に形成された貫通孔5を介して鋼材Sの表面に順次供給され、その水分が犠牲陽極材4と鋼材Sとの間に生じた隙間6を通って鋼材Sの表面上を広がっていく。これにより、犠牲陽極材4と鋼材Sの表面との間には長期間にわたって水分が存在するため、それら材料間には継続して電位差が生じ、犠牲陽極材4側では腐食反応が継続して起こり、その間は犠牲陽極材4から鋼材Sの表面に両者の接触箇所を通じて電子eが供給されるので、その結果、鋼材Sの表面には、長期間にわたって腐食が発生しない。
Embodiment 2
Although the anticorrosion material according to Embodiment 1 uses a plurality of metal pieces as the sacrificial anode material, the present invention makes the surface of the steel material a moist environment by the moisture supply sheet, and the sacrificial anode material serves as a sacrificial anode for the steel material. The anticorrosion material which has the sacrificial anode material 4 which consists of metal foil as shown in FIG. 7, for example may be sufficient.
The sacrificial anode material 4 is fixed to the surface 2 of the moisture supply sheet 1 by needle punching. Moisture from the moisture supply sheet 1 is sequentially supplied to the surface of the steel material S through the through holes 5 formed in the sacrificial anode material 4 by needle punching, and the moisture is generated between the sacrificial anode material 4 and the steel material S. The surface of the steel material S spreads through the gap 6. Thereby, since moisture exists between the sacrificial anode material 4 and the surface of the steel material S over a long period of time, a potential difference is continuously generated between the materials, and the corrosion reaction is continued on the sacrificial anode material 4 side. In the meantime, since the electron e is supplied from the sacrificial anode material 4 to the surface of the steel material S through the contact point between the two, the surface of the steel material S is not corroded over a long period of time.

このように、水分保持能が高められた水分供給シート1により長期間継続して鋼材Sの腐食を抑制することができる。また、犠牲陽極材4を水分供給シート1の表面2にニードルパンチにより固定するため、防食材を作成する際の労力を低減することができる。   Thus, the corrosion of the steel material S can be suppressed for a long period of time by the moisture supply sheet 1 with enhanced moisture retention capability. In addition, since the sacrificial anode material 4 is fixed to the surface 2 of the moisture supply sheet 1 by needle punching, it is possible to reduce the labor when creating the anticorrosion material.

なお、実施形態1および2における水分供給シートは、鋼材Sの表面の形状に応じて撓むような可撓性を有するものが好ましい。例えば、図8に示すような鋼材Sの凹部Rに対して、可撓性を有する水分供給シート7をその形状に応じて撓ませて配置することで、鋼材Sに犠牲陽極材3を均一に接触させることができる。これにより、複雑な形状によりケレンを十分に施すことが困難な鋼材Sに対しても長期間継続して腐食を抑制することができる。
また、実施形態1および2における水分供給シートは、ハサミなどの切断器具により容易に切断することができ、鋼材の形状に応じた柔軟な施工を行うことができる。
In addition, the water supply sheet in Embodiments 1 and 2 is preferably flexible so as to bend according to the shape of the surface of the steel material S. For example, the sacrificial anode material 3 can be uniformly formed on the steel material S by bending the moisture supply sheet 7 having flexibility with respect to the concave portion R of the steel material S as shown in FIG. Can be contacted. Thereby, corrosion can be continuously suppressed for a long period of time even for the steel material S for which it is difficult to sufficiently apply kelen due to its complicated shape.
Moreover, the moisture supply sheet in Embodiment 1 and 2 can be easily cut | disconnected with cutting tools, such as scissors, and can perform flexible construction according to the shape of steel materials.

1,7 水分供給シート、2 表面、3,4 犠牲陽極材、5 貫通孔、6 隙間、S 鋼材、R 凹部。   1, 7 Moisture supply sheet, 2 surface, 3, 4 sacrificial anode material, 5 through hole, 6 gap, S steel material, R recess.

Claims (7)

鋼材の表面に接触して配置される防食材であって、
親水性官能基を有する繊維を含み、繊維間及び繊維中において保持された水分により、前記鋼材の表面を湿潤環境にする水分供給シートと、
記水分供給シートの前記鋼材と対向する表面及び前記水分供給シート内に配置され、前記水分供給シートにより湿潤環境にされた前記鋼材の表面と接触して前記鋼材に対する犠牲陽極となる犠牲陽極材とを備えたことを特徴とする防食材。
An anti-corrosion material placed in contact with the surface of the steel material,
A moisture supply sheet containing fibers having a hydrophilic functional group, and making the surface of the steel material a moist environment by moisture retained between and in the fibers;
It placed before Symbol moisture the steel facing surfaces of the donor sheet and the water supply in the sheet, the sacrificial anode with respect to the steel in contact with the water by the donor sheet Rishime Jun environment has been the steel surface An anticorrosive material comprising a sacrificial anode material.
前記親水性官能基を有する繊維は、架橋構造と1〜12mmol/gのカルボキシル基量を有する請求項に記載の防食材。 The anticorrosive material according to claim 1 , wherein the fiber having a hydrophilic functional group has a crosslinked structure and a carboxyl group amount of 1 to 12 mmol / g. 前記犠牲陽極材は少なくとも前記水分供給シートの表面に配置された複数の金属片からなり、それぞれの金属片の間隙を介して前記水分供給シートから前記鋼材の表面に水分が供給される請求項1または2に記載の防食材。 The sacrificial anode material is composed of at least a plurality of metal pieces arranged on the surface of the moisture supply sheet, and moisture is supplied from the moisture supply sheet to the surface of the steel material through a gap between the metal pieces. Or the anticorrosion material of 2 . 前記複数の金属片は、前記水分供給シートの表面に樹脂製の固着剤により固定される請求項に記載の防食材。 The anticorrosive material according to claim 3 , wherein the plurality of metal pieces are fixed to a surface of the moisture supply sheet with a resin adhesive. 前記犠牲陽極材はニードルパンチにより前記水分供給シートの表面に固定された金属箔からなり、ニードルパンチにより前記犠牲陽極材に形成された貫通孔を介して前記水分供給シートから前記鋼材の表面に水分が供給される請求項1または2に記載の防食材。 The sacrificial anode material is made of a metal foil fixed to the surface of the moisture supply sheet by needle punching, and moisture is supplied from the moisture supply sheet to the surface of the steel material through a through hole formed in the sacrificial anode material by needle punching. The anticorrosive material according to claim 1 or 2 , wherein is supplied. 前記犠牲陽極材は、アルミニウム、亜鉛、マグネシウム、またはこれらを含む合金からなる請求項1〜のいずれか一項に記載の防食材。 The said sacrificial anode material is an anticorrosive material as described in any one of Claims 1-5 which consists of aluminum, zinc, magnesium, or an alloy containing these. 前記水分供給シートは、前記鋼材の表面の形状に応じて撓むような可撓性を有する請求項1〜のいずれか一項に記載の防食材。 The said moisture supply sheet is an anticorrosive material as described in any one of Claims 1-6 which has flexibility which bends according to the shape of the surface of the said steel material.
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