JPH0431028B2 - - Google Patents
Info
- Publication number
- JPH0431028B2 JPH0431028B2 JP62119567A JP11956787A JPH0431028B2 JP H0431028 B2 JPH0431028 B2 JP H0431028B2 JP 62119567 A JP62119567 A JP 62119567A JP 11956787 A JP11956787 A JP 11956787A JP H0431028 B2 JPH0431028 B2 JP H0431028B2
- Authority
- JP
- Japan
- Prior art keywords
- corrosion
- electrode
- metal
- cylindrical electrode
- platinum group
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 229910052751 metal Inorganic materials 0.000 claims description 45
- 239000002184 metal Substances 0.000 claims description 45
- 238000005260 corrosion Methods 0.000 claims description 26
- 239000011248 coating agent Substances 0.000 claims description 22
- 238000000576 coating method Methods 0.000 claims description 22
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical group [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 18
- 230000007797 corrosion Effects 0.000 claims description 17
- 229910045601 alloy Inorganic materials 0.000 claims description 13
- 239000000956 alloy Substances 0.000 claims description 13
- 239000004020 conductor Substances 0.000 claims description 12
- 230000010287 polarization Effects 0.000 claims description 11
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 5
- HTXDPTMKBJXEOW-UHFFFAOYSA-N dioxoiridium Chemical compound O=[Ir]=O HTXDPTMKBJXEOW-UHFFFAOYSA-N 0.000 claims description 5
- 229910052725 zinc Inorganic materials 0.000 claims description 5
- 239000011701 zinc Substances 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 229910000457 iridium oxide Inorganic materials 0.000 claims description 4
- 229910044991 metal oxide Inorganic materials 0.000 claims description 4
- -1 platinum group metal oxide Chemical class 0.000 claims description 4
- 229910052719 titanium Inorganic materials 0.000 claims description 4
- 239000010936 titanium Substances 0.000 claims description 4
- 229910052758 niobium Inorganic materials 0.000 claims description 3
- 239000010955 niobium Substances 0.000 claims description 3
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 3
- 229910052715 tantalum Inorganic materials 0.000 claims description 3
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims description 3
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 2
- 239000011241 protective layer Substances 0.000 claims description 2
- 229910052726 zirconium Inorganic materials 0.000 claims description 2
- 238000004210 cathodic protection Methods 0.000 description 12
- 239000007772 electrode material Substances 0.000 description 7
- 239000000945 filler Substances 0.000 description 6
- 150000002739 metals Chemical class 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 239000003822 epoxy resin Substances 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 229920000647 polyepoxide Polymers 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 239000011810 insulating material Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 229910052741 iridium Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229910003446 platinum oxide Inorganic materials 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Prevention Of Electric Corrosion (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、各種金属や合金類の防食用電極、特
に淡水中あるいは海水中の金属部材や土中に埋設
された金属並びにコンクリート中の鉄筋や鉄骨等
の陰極防食に使用する堅牢で取扱いの容易な防食
用陽極に関する。Detailed Description of the Invention (Field of Industrial Application) The present invention is applicable to anticorrosion electrodes for various metals and alloys, especially for metal members in freshwater or seawater, metals buried in soil, and reinforcing bars in concrete. This invention relates to a robust and easy-to-handle anticorrosion anode used for cathodic protection of steel frames, etc.
（従来技術とその問題点）
従来から水中、土中及びコンクリート中等にあ
る金属部材や金属配管の腐食を防止するために、
防食塗装により絶縁部材等を環境から隔離する方
法が採用されているが、該塗装のみでは長時間経
過によるピンホールの発生や塗料成分の変化等に
よる金属の露出がしばしば生じ完全な防食を行う
ことができなかつた。(Prior art and its problems) Conventionally, in order to prevent corrosion of metal parts and metal piping that are underwater, underground, concrete, etc.,
Anti-corrosion coating is used to isolate insulating components from the environment, but with this coating alone, metals often become exposed due to the formation of pinholes over a long period of time or changes in paint components, making it difficult to achieve complete corrosion protection. I couldn't do it.
防食を完全にするために近年では電気防食が採
用され、該電気防食は例えば鉄等の防食されるべ
き金属を負に分極させることにより安定化するこ
とに基づく防食方法であり、この状態が続く限り
防食作用が継続するため、非常に重要な防食手段
である。 In recent years, cathodic protection has been adopted to achieve complete corrosion protection. Cathodic protection is a corrosion protection method based on stabilizing the metal to be protected, such as iron, by negatively polarizing it, and this state continues. It is an extremely important anti-corrosion measure because its anti-corrosion effect continues for as long as possible.
現在行われている電気防食法は大別して、流電
防食と陰極電気防食の２種類があるが、前者は犠
牲陽極を使用し該犠牲陽極がみずから溶解して被
防食金属を負極として安定させる方式であるた
め、陽極の定期的な交換を必要とし煩雑な保守作
業が必要となるという欠点がある。一方後者の陰
極電気防食は不溶性陽極を使用して被防食金属と
の間に直流電源を接続し通電を行うことにより前
記被防食金属を負に維持して安定化させるもので
ある。該陰極電気防食は電源を停止しない限り防
食作用が継続するという長所があり設備的に大が
かりになるという欠点を有するにもかかわらず広
く採用されている。 The cathodic protection methods currently in use can be roughly divided into two types: galvanic protection and cathodic protection.The former uses a sacrificial anode, which dissolves itself and stabilizes the metal to be protected as a negative electrode. Therefore, there is a drawback that the anode needs to be replaced periodically and complicated maintenance work is required. On the other hand, the latter cathodic electrolytic protection uses an insoluble anode to connect a DC power supply between the metal to be protected and supply electricity, thereby maintaining the metal to be protected in a negative state and stabilizing it. The cathodic protection has the advantage that the corrosion protection continues as long as the power supply is not stopped, and is widely used despite the disadvantage that it requires large-scale equipment.
該陰極電気防食は使用する陽極の材料等の面で
改良が続けられているが、電極と該電極に通電す
るための導線とが別個に製造され、所定箇所への
設置に際しても該設置を別々に行わなければなら
ず、かつ該設置が通常長距離に亘りあるいは広大
な面積に亘るためその工事量が莫大なものにな
り、しかも設置時の前記電極と導線との接続が不
十分であるとその部分に腐食が生じ易くなるとい
う欠点がある。 Cathodic protection continues to be improved in terms of the material of the anode used, but the electrode and the conductor for energizing the electrode are manufactured separately, and even when installed at a predetermined location, it is difficult to install the electrode separately. The amount of work required is enormous because the installation usually spans a long distance or over a vast area, and the connection between the electrode and the conductor at the time of installation is insufficient. The disadvantage is that corrosion tends to occur in that area.
（発明の目的）
本発明は叙上の問題点を解決するために為され
たもので、電気防食に使用する十分な耐久性と施
工及び保守の容易性を合わせ持つ防食用電極を提
供することを目的とする。(Objective of the Invention) The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a corrosion-protective electrode that has sufficient durability and ease of construction and maintenance for use in cathodic protection. With the goal.
（問題点を解決するための手段）
本発明は第１に、外表面に白金族金属及び／又
は白金族金属酸化物を含む被覆が形成された耐食
性金属より成る筒状電極と、該筒状電極の内部を
貫通する、１又は２以上の箇所で切開された絶縁
性被覆が形成された可撓性の導線とを含んで成
り、前記絶縁性被覆の切開部の芯線と前記筒状電
極の内壁とを外界から絶縁された導電性接続体に
より電気的に接続したことを特徴とする防食用電
極であり、第２に上記防食用電極にその外表面の
白金族金属及び／又は白金族金属酸化物を含む被
覆の少なくとも一部に、分極により溶解する金属
及び／又は合金から成る保護層を設けたことを特
徴とする防食用電極である。(Means for Solving the Problems) The present invention firstly provides a cylindrical electrode made of a corrosion-resistant metal whose outer surface is coated with a platinum group metal and/or a platinum group metal oxide; a flexible conductor wire formed with an insulating coating cut at one or more places, which penetrates the inside of the electrode, and a core wire of the cutout part of the insulating coating and the cylindrical electrode. It is a corrosion-protecting electrode characterized in that the inner wall is electrically connected to the inner wall by a conductive connecting body insulated from the outside world, and secondly, the corrosion-protecting electrode has a platinum group metal and/or a platinum group metal on its outer surface. This is a corrosion-protective electrode characterized in that a protective layer made of a metal and/or alloy that dissolves by polarization is provided on at least a portion of the coating containing an oxide.
以下本発明を詳細に説明する。 The present invention will be explained in detail below.
本発明における筒状電極は、電気防食用の電極
が設置現場において粗雑に取扱われがちであるた
め、電極基体は該取扱いに耐え得る材料で形成さ
れることが必要でありかつ十分な耐食性を必要と
するので、耐食性金属、例えばチタン、ジルコニ
ウム、ニオブ、タンタル等の弁金属又はこれらの
金属を主成分とする合金が好適である。そして該
耐食性金属上へ電極活性物質である白金族金属及
び／又はその酸化物を主成分とする被覆を形成し
て電極とする。該白金族金属及びその酸化物は、
Pt、Ir、Os、Pd、Ru、Rh又はこれらの酸化物で
あればいずれでもよいが、耐久性の面で酸化イリ
ジウム（IrO2）を含む被覆を使用することが最も
好ましく、表面が堅牢で傷が付きにくい電極を製
造することができる。 In the cylindrical electrode of the present invention, since electrodes for cathodic protection tend to be handled roughly at the installation site, the electrode base needs to be made of a material that can withstand such handling and needs to have sufficient corrosion resistance. Therefore, corrosion-resistant metals, such as valve metals such as titanium, zirconium, niobium, and tantalum, or alloys containing these metals as main components are suitable. Then, a coating mainly composed of a platinum group metal and/or its oxide, which is an electrode active material, is formed on the corrosion-resistant metal to form an electrode. The platinum group metal and its oxide are
Any coating containing Pt, Ir, Os, Pd, Ru, Rh or any of these oxides may be used, but from the viewpoint of durability, it is most preferable to use a coating containing iridium oxide (IrO 2 ), which has a robust surface. It is possible to manufacture electrodes that are less likely to be scratched.
例えば電解による白金と酸化イリジウムの消耗
度を加速条件下、希硫酸中、電流密度1.5A／cm2
において比較すると、前者は１〜10mg／KAHで
あるのに対し、後者では0.1〜0.01mg／KAHであ
り、これらはいずれも従来から使用されているフ
エライトその他の電極材料よりも遥かに長寿命で
ある。 For example, under conditions that accelerate the depletion of platinum and iridium oxide by electrolysis, in dilute sulfuric acid, at a current density of 1.5 A/cm 2
When compared, the former is 1 to 10 mg/KAH, while the latter is 0.1 to 0.01 mg/KAH, both of which have a much longer lifespan than conventionally used ferrite and other electrode materials. be.
本発明では、前記筒状電極の内部に絶縁性被覆
が形成された可撓性の導線を貫通させ、かつ電気
的に接続して該筒状電極及び導線を予め一体化し
設置現場における組み立てを不必要とする。該接
続はどのような方法によつてもよいが、前記導線
の絶縁性被覆の一部を切開して芯線を露出させ、
その外径が前記筒状電極の内径とほぼ等しく、内
縁側に前記導線の切開部に当接する凹部が形成さ
れた導線性接続体を前記切開部に嵌合して前記芯
線と接触させ、該接続体の外縁部を前記筒状電極
の内縁部に接触させ、プレス等適宜の方法で各部
材を相互に固定することが最も好ましい。 In the present invention, a flexible conductive wire coated with an insulating coating is passed through the cylindrical electrode and electrically connected to integrate the cylindrical electrode and the conductive wire in advance, thereby eliminating assembly at the installation site. I need. The connection may be made by any method, but the insulating coating of the conductive wire is partially cut to expose the core wire,
A conductive connecting body, the outer diameter of which is approximately equal to the inner diameter of the cylindrical electrode, and which has a recess formed on the inner edge side that contacts the cutout of the conductive wire, is fitted into the cutout and brought into contact with the core wire. Most preferably, the outer edge of the connecting body is brought into contact with the inner edge of the cylindrical electrode, and each member is fixed to each other by an appropriate method such as pressing.
前記導電性接続体を含む接続部は外界と隔離す
る、つまり外気や土等と接触させないようにする
必要があり、そのためには前記導線と前記筒状電
極の間に各種充填剤、例えばエポキシ樹脂や塩化
ビニル樹脂等を充填したり、フツ素樹脂を加熱圧
入する方法がある。土水等の進入を確実に防止す
るために前記導線と前記筒状電極の間の充填剤と
前記導線あるいは前記筒状電極の間にＯリング等
を封入して前記接続部を密封してもよく、これに
より耐久性が一段と向上する。 It is necessary to isolate the connection part including the conductive connection body from the outside world, that is, to prevent it from coming into contact with the outside air, soil, etc. For this purpose, various fillers, such as epoxy resin, are used between the conductor wire and the cylindrical electrode. There are methods such as filling with polyvinyl chloride resin, etc., or heating and press-fitting fluororesin. In order to reliably prevent the intrusion of earth water, etc., the connecting portion may be sealed by sealing an O-ring or the like between the filler between the conducting wire and the cylindrical electrode and the conducting wire or the cylindrical electrode. Often, this increases durability even further.
又上記した筒状電極の白金族金属等の被覆上の
少なくとも一部を亜鉛、銅又はこれらの合金を使
用して被覆することができる。該金属又は合金は
分極特に陽分極により溶解して前記白金族金属等
の被覆上から除去される。従つて本発明に係わる
防食用電極を例えば陽極として陰極防食に使用す
る際には、前記亜鉛等により白金族金属等の被覆
が保護されて施工作業での損傷が防止され、かつ
通電すると陽分極により該亜鉛等が除去されて前
記白金族金属等の全被覆面が露出して有効に電気
防食に利用することができる。 Furthermore, at least a portion of the platinum group metal coating of the cylindrical electrode described above may be coated with zinc, copper, or an alloy thereof. The metal or alloy is dissolved and removed from the platinum group metal coating by polarization, particularly anodic polarization. Therefore, when the anticorrosion electrode according to the present invention is used as an anode for cathodic protection, the zinc or the like protects the platinum group metal coating from damage during construction work, and when energized, it becomes anode polarized. As a result, the zinc and the like are removed and the entire surface coated with the platinum group metal is exposed and can be effectively used for cathodic protection.
以下添付図面に示す一実施例に基づいて本発明
をより詳細に説明するが、該実施例は本発明を限
定するものではない。 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail below based on one embodiment shown in the accompanying drawings, but the present invention is not limited to this embodiment.
（実施例）
第１図は、本発明に関わる防食用電極の一実施
例を示す一部破断正面図、第２図は、第１図の
−線横断面図である。(Example) FIG. 1 is a partially cutaway front view showing an example of a corrosion-protective electrode according to the present invention, and FIG. 2 is a cross-sectional view taken along the line -- in FIG. 1.
縦方向に延びる導線１は、多数の小径の銅線、
アルミニウム線等を束ねた芯線２と該芯線２の周
囲に被覆した合成樹脂等の可撓性の絶縁材料３か
ら成り、該導線１の前記絶縁材料３はその一部が
円周方向に全て除去されて切開部４が形成されて
いる。なお該切開部は円周方向に全て切開せずに
一部を切開するようにしてもよい。 The conductive wire 1 extending in the vertical direction includes a large number of small diameter copper wires,
It consists of a core wire 2 made of a bundle of aluminum wires etc. and a flexible insulating material 3 such as synthetic resin coated around the core wire 2, and a part of the insulating material 3 of the conductor 1 is completely removed in the circumferential direction. and an incision 4 is formed. Note that the incision may not be made entirely in the circumferential direction but may be made in part.
該切開部４には、内縁形状が前記芯線２の外径
と一致する左右１対の半ドーナツ形の導電性接続
体５が当接し、該導電性接続体５の外縁は比較的
薄肉の筒状電極６の内面に当接し該筒状電極６と
前記芯線２とを電気的に接続している。前記接続
体５の上下両側の前記導線１と前記筒状電極６と
の間には、エポキシ樹脂等の充填剤７が充填さ
れ、前記接続体５、及び該接続体５と前記導線１
及び前記筒状電極６との両接続部を外界から隔離
し土水等が侵入しないようにしている。又前記筒
状電極６の上下端近傍の前記充填剤７との接触部
分にはＯリング８が埋設され前記接続体５及びそ
の接続部の保護をより完全なものとしている。 A pair of left and right half-doughnut-shaped conductive connectors 5 whose inner edge shape matches the outer diameter of the core wire 2 are in contact with the cutout 4, and the outer edge of the conductive connectors 5 is a relatively thin cylinder. It contacts the inner surface of the cylindrical electrode 6 and electrically connects the cylindrical electrode 6 and the core wire 2. A filler 7 such as epoxy resin is filled between the conductive wire 1 and the cylindrical electrode 6 on both upper and lower sides of the connecting body 5, and the connecting body 5 and the connecting body 5 and the conductive wire 1 are filled with a filler 7 such as an epoxy resin.
Both the connecting portions with the cylindrical electrode 6 are isolated from the outside world to prevent soil, water, etc. from entering. Further, O-rings 8 are embedded in the contact portions with the filler 7 near the upper and lower ends of the cylindrical electrode 6 to more completely protect the connecting body 5 and its connecting portion.
前記筒状電極６の外面には、例えば酸化イリジ
ウムである白金族金属及び／又はその酸化物を含
む電極活性物質が被覆されて、陰極電気防食用の
陽極とされている。なお、該電極活性物質の表面
の少なくとも一部を亜鉛、銅又はこれらを主成分
とする合金であつて陽分極することにより溶解す
る金属又は合金で被覆するようにすることができ
る。 The outer surface of the cylindrical electrode 6 is coated with an electrode active material containing a platinum group metal and/or its oxide, such as iridium oxide, to serve as an anode for cathodic protection. Note that at least a portion of the surface of the electrode active material may be coated with a metal or alloy that is zinc, copper, or an alloy containing these as main components and that dissolves upon anodic polarization.
上記形状を有し、厚さ1.5mm、外径20mm、長さ
30mmである計２個のチタン製筒状電極中に、仕上
げ外径15mm導線外径９mmであり金属部の断面積が
60mm2である導線を貫通させ、前記各電極と導線を
導電性接続体で電気的に接続するとともにエポキ
シ樹脂を充填して一体化した。該一体化された電
極を平均抵抗2500Ωcmの地中に掘つた直径約100
mm深さ30ｍの井戸の中に挿入し、挿入後井戸をベ
ントナイト泥で充填した。この電極を土中１ｍに
埋設された塩化ビニルで被覆された炭素鋼鋼管
（直径150mm長さ500ｍ）を保護するために使用し
た。 Has the above shape, thickness 1.5mm, outer diameter 20mm, length
Two titanium cylindrical electrodes with a total diameter of 30 mm have a finished outer diameter of 15 mm, a conductor outer diameter of 9 mm, and a cross-sectional area of the metal part.
A 60 mm 2 conductive wire was passed through the structure, and each of the electrodes and the conductive wire were electrically connected with a conductive connector and integrated by filling with epoxy resin. The integrated electrode was dug into the ground with an average resistance of 2500Ωcm and a diameter of about 100mm.
It was inserted into a well with a depth of 30 m, and after insertion, the well was filled with bentonite mud. This electrode was used to protect a vinyl chloride-coated carbon steel pipe (diameter 150 mm, length 500 m) buried 1 m underground.
６カ月の間、該鋼管の電位を−1.0Vに維持す
るよう努めたところ、供給電圧約25Vで電流値は
6.5Aであつた。 When I tried to maintain the potential of the steel pipe at -1.0V for 6 months, the supply voltage was about 25V and the current value was
It was 6.5A.
又この間の陽極電位は1.1Vで変化はなく、又
シール部分からの水及び土壌の流入、内部の導線
の溶出も観察されなかつた。 During this period, the anode potential remained unchanged at 1.1V, and no inflow of water or soil from the seal portion or elution of the internal conductive wire was observed.
（発明の効果）
本発明に係わる防食用電極は、外表面に電極活
性物質の被覆が形成された耐食性金属より成る筒
状電極と、その内部を貫通する可撓性の導線とか
ら成り、該導線の芯線と前記筒状電極とを外界か
ら絶縁された導電性接続体により電気的に接続し
更に必要に応じて前記電極活性物質の少なくとも
一部を分極特に陽分極により溶解する金属及び／
又は合金で被覆してある。(Effects of the Invention) The anti-corrosion electrode according to the present invention consists of a cylindrical electrode made of a corrosion-resistant metal whose outer surface is coated with an electrode active substance, and a flexible conductive wire penetrating the inside of the cylindrical electrode. The core wire of the conducting wire and the cylindrical electrode are electrically connected by a conductive connecting body insulated from the outside world, and if necessary, a metal and/or which dissolves at least a part of the electrode active material by polarization, particularly anodic polarization.
or coated with an alloy.
従つて第１に筒状電極と導線が一体化し規格化
されているため、工場で接続部に問題が生ずるこ
とのないよう大量生産することができ、又施工現
場では通常の導線と同様に取扱うことができるた
め、特に現場での作業効率が大きく向上する。し
かも白金族金属等の電極活性物質の少なくとも一
部を陽分極により溶解する金属等で被覆しておく
と施工時には前記電極活性物質が保護され通電時
には前記溶解する金属が除去されて防食に支障を
来さないため非常に好都合である。 Therefore, firstly, the cylindrical electrode and conductor wire are integrated and standardized, so they can be mass-produced at the factory without any problems with the connections, and they can be handled in the same way as regular conductors at the construction site. This greatly improves work efficiency, especially on-site. Moreover, if at least a part of the electrode active material such as platinum group metal is coated with a metal that dissolves by anodic polarization, the electrode active material will be protected during construction, and when electricity is applied, the soluble metal will be removed and will not interfere with corrosion protection. This is very convenient as they do not come.
第２に白金族金属等が被覆された金属製の筒状
電極を使用しているため取扱いが容易であるとと
もに外力に対する耐性が大きく、本発明の防食用
電極を長期に亘つて使用することを可能にしかつ
保守に要する費用及び労力が低減される。 Second, since a metal cylindrical electrode coated with platinum group metal or the like is used, it is easy to handle and has high resistance to external forces, making it possible to use the anti-corrosion electrode of the present invention for a long period of time. maintenance costs and effort are reduced.
第３に導線が可撓性であるため設置する場所の
状況にかかわらず対極の形状等に応じて最適な配
置とし、これにより陽極と陰極が可能な限り近接
し両極間の抵抗が小さくなり印加する電圧も減少
し省エネルギー化が可能になる。 Thirdly, since the conductor is flexible, it can be placed in the optimal position according to the shape of the counter electrode, etc., regardless of the location where it is installed.This allows the anode and cathode to be as close as possible, reducing the resistance between the two electrodes and applying voltage. This also reduces the voltage applied, making it possible to save energy.
第１図は、本発明に関わる防食用電極の一実施
例を示す一部破断正面図、第２図は、第１図の
−線横断面図である。
１……導線、２……芯線、３……絶縁材料、４
……切開部、５……導電性接続体、６……筒状電
極、７……充填剤、８……Ｏリング。
FIG. 1 is a partially cutaway front view showing one embodiment of the anticorrosive electrode according to the present invention, and FIG. 2 is a cross-sectional view taken along the line -- in FIG. 1. 1... Conductor wire, 2... Core wire, 3... Insulating material, 4
... Incision, 5 ... Conductive connection body, 6 ... Cylindrical electrode, 7 ... Filler, 8 ... O-ring.
Claims (1)
化物を含む被覆が形成された耐食性金属より成る
筒状電極と、該筒状電極の内部を貫通する、１又
は２以上の箇所で切開された絶縁性被覆が形成さ
れた可撓性の導線とを含んで成り、前記絶縁性被
覆の切開部の芯線と前記筒状電極の内壁とを外界
から絶縁された導電性接続体により電気的に接続
したことを特徴とする防食用電極。 ２ 筒状電極に形成された被覆が、酸化イリジウ
ムを主成分とする被覆である特許請求の範囲第１
項に記載の防食用電極。 ３ 耐食性金属が、チタン、ジルコニウム、ニオ
ブ、タンタル及びこれらの主成分とする合金から
成る群から選択されるものである特許請求の範囲
第１項又は第２項に記載の防食用電極。 ４ 外表面に、白金族金属及び／又は白金族金属
酸化物と、該白金族金属及び／又は白金族金属酸
化物の少なくとも一部を被覆する分極により溶解
する金属及び／又は合金の保護層から成る被覆が
形成された耐食性金属より成る筒状電極と、該筒
状電極の内部を貫通する、１又は２以上の箇所で
切開された絶縁性被覆が形成された可撓性の導線
とを含んで成り、前記絶縁性被覆の切開部の芯線
と前記筒状電極の内壁とを外界から絶縁された導
電性接続体により電気的に接続したことを特徴と
する防食用電極。 ５ 分極が陽分極であり、該陽分極により溶解す
る金属及び／又は合金が、亜鉛、銅及びこれらを
主成分とする合金から成る群から選択されるもの
である特許請求の範囲第４項に記載の防食用電
極。 ６ 筒状電極に形成された被覆が、酸化イリジウ
ムを主成分とする被覆である特許請求の範囲第４
項又は第５項に記載の防食用電極。 ７ 耐食性金属が、チタン、ニオブ、タンタル及
びこれらの主成分とする合金から成る群から選択
されるものである特許請求の範囲第４項から第６
項までのいずれかに記載の防食用電極。[Scope of Claims] 1. A cylindrical electrode made of a corrosion-resistant metal whose outer surface is coated with a platinum group metal and/or a platinum group metal oxide, and 1 or 2 that penetrates the inside of the cylindrical electrode. and a flexible conductor wire formed with an insulating coating cut out at the above locations, the core wire of the insulated coating cutout and the inner wall of the cylindrical electrode being insulated from the outside world. An anti-corrosion electrode characterized by being electrically connected by a connecting body. 2. Claim 1, wherein the coating formed on the cylindrical electrode is a coating containing iridium oxide as a main component.
Corrosion-preventing electrodes described in section. 3. The corrosion-resistant electrode according to claim 1 or 2, wherein the corrosion-resistant metal is selected from the group consisting of titanium, zirconium, niobium, tantalum, and alloys containing these as main components. 4. On the outer surface, a platinum group metal and/or a platinum group metal oxide, and a protective layer of a metal and/or alloy that is soluble by polarization and covers at least a portion of the platinum group metal and/or platinum group metal oxide. a cylindrical electrode made of a corrosion-resistant metal with a coating formed thereon; and a flexible conductor wire with an insulating coating cut at one or more places that penetrates the inside of the cylindrical electrode. An anti-corrosion electrode comprising: a core wire of the cut portion of the insulating coating and an inner wall of the cylindrical electrode are electrically connected by a conductive connector insulated from the outside world. 5. According to claim 4, the polarization is anodic polarization, and the metal and/or alloy dissolved by the anodic polarization is selected from the group consisting of zinc, copper, and alloys containing these as main components. The anti-corrosion electrode described. 6 Claim 4, wherein the coating formed on the cylindrical electrode is a coating containing iridium oxide as a main component.
The anticorrosive electrode according to item 1 or item 5. 7. Claims 4 to 6, wherein the corrosion-resistant metal is selected from the group consisting of titanium, niobium, tantalum, and alloys containing these as main components.
The anti-corrosion electrode according to any of the preceding paragraphs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62119567A JPS63286591A (en) | 1987-05-16 | 1987-05-16 | Corrosion preventing electrode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62119567A JPS63286591A (en) | 1987-05-16 | 1987-05-16 | Corrosion preventing electrode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63286591A JPS63286591A (en) | 1988-11-24 |
| JPH0431028B2 true JPH0431028B2 (en) | 1992-05-25 |
Family
ID=14764533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62119567A Granted JPS63286591A (en) | 1987-05-16 | 1987-05-16 | Corrosion preventing electrode |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63286591A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4824737B2 (en) * | 2008-11-26 | 2011-11-30 | 株式会社東京興業貿易商会 | Anode body for cathodic protection, concrete structure provided with the anode body, and method for producing anode body for cathodic protection |
-
1987
- 1987-05-16 JP JP62119567A patent/JPS63286591A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63286591A (en) | 1988-11-24 |
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