JP4638635B2 - Sacrificial electrode and cathodic protection method - Google Patents

Sacrificial electrode and cathodic protection method Download PDF

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Publication number
JP4638635B2
JP4638635B2 JP2001290849A JP2001290849A JP4638635B2 JP 4638635 B2 JP4638635 B2 JP 4638635B2 JP 2001290849 A JP2001290849 A JP 2001290849A JP 2001290849 A JP2001290849 A JP 2001290849A JP 4638635 B2 JP4638635 B2 JP 4638635B2
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anticorrosion
electrode
anode
sacrificial electrode
sacrificial
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JP2003096582A (en
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祐亮 一ノ瀬
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Nippon Steel Corp
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F2213/00—Aspects of inhibiting corrosion of metals by anodic or cathodic protection
    • C23F2213/20—Constructional parts or assemblies of the anodic or cathodic protection apparatus
    • C23F2213/21—Constructional parts or assemblies of the anodic or cathodic protection apparatus combining at least two types of anodic or cathodic protection

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  • Prevention Of Electric Corrosion (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、例えば、屋外機械設備、屋外建造物を防食するために用いられる犠牲電極及びそれを用いる電気防食方法に関する。
【０００２】
【従来の技術】
従来の大気中の電気防食システムの概要を図４に示す。防食対象物３は、金属表面を塗装し、塗膜４上に絶縁物７を介して電気防食用電極１を正極、防食対象物３を負極として電源２とを導線５により結線する。金属は鉄等が使用される。金属表面が乾燥し、液膜が形成されない状態では防食電流が流れないが、乾燥状態では錆の発生がないために防食の必要性がない。
降雨等により塗装表面が濡れ、液膜６が形成された場合には錆が進展する状態になるが、液膜６を媒体として電気が流れて塗膜欠陥の錆の進展が防止されて塗膜の寿命が格段に長くなる。
【０００３】
しかし、防食対象物３の近くに商用電源がない場合は、電源から電極設置部まで数百ｍも導線５を配線する必要があり、設置のためのコストが大幅に増加する。導線５が長くなると、導線５が途中で切れることも多くなり、防食効果を維持することが困難になる。また、防食対象物３の面積が広くなると、交流を直流に変換する電源の個数も多くなり、配線及び電源の設置コストが高くなる。
【０００４】
このような課題を解決する方法として、図５に示すように、電源として太陽電池９と犠牲陽極８を組合せた特許が開示されている（特開平７−３１６８５０号公報）。本方法は、太陽が照射されている状態では太陽電池９により発電された電気により防食し、太陽が照射されない夜間や雨天時には切りかえスイッチ１０により電源部を切りかえて犠牲陽極８の溶解により発生した電気により防食する方法である。本方法は、商用電源から遠く離れた防食対象物３においても長い導線５が必要なく防食が可能である。
【０００５】
しかし、太陽電池９及び犠牲陽極８により発生する電圧は１〜２Ｖと低い。犠牲陽極８による電気防食が適用されている水中や土中のように塗膜４の表面に形成する水膜４が厚くて電気抵抗が低い場合は、数ｍの範囲の電気防食が可能である。一方、大気中の設備は、塗膜４表面に形成する液膜６の厚みが１〜１００μｍと薄くて電気抵抗が高くなり、防食可能範囲が数十cmの範囲しかなく、犠牲陽極８を多く設置する必要が生じて設置コストが増加する。
【０００６】
【発明が解決しようとする課題】
前記した従来の技術は、電源から遠い大気中の防食対象物へ電気防食をするには設置コストが距離に比例して増加するという問題点があった。そこで、本発明は、商用電源が無くとも広範囲で防食が可能な大気中の電気防食に用いる犠牲電極及び電気防食方法を提供することを目的とする。
【０００７】
【課題を解決するための手段】
本発明の電気防食方法以下の通りである。
（１）電気防食に用いる犠牲電極において、陽極と絶縁板と陰極をこの順に複数重ね合わせた積層構造とし、絶縁物をはさむ陰極と陽極は導線で接続され、絶縁板間の陰極と陽極は電気的に接触していることを特徴とする犠牲電極、（２）導電性弾性体を介して、犠牲電極を上部から押圧しながら、防食対象物と固定する固定手段を有することを特徴とする（１）記載の犠牲電極、（３）金属製の防食対象物の表面を塗装し、塗装表面上に絶縁物を介して前記（１）又は（２）記載の犠牲電極を正極として設置し、防食対象物を負極として通電することを特徴とする電気防食方法である。
【０００８】
【発明の実施の形態】
以下に、本発明を詳細に説明する。
犠牲電極１の構造を図１から図３に示す。陽極８、１８、２１と陰極１７、２０、２３と遮断用絶縁物１６、１９、２２はドーナッツ状の形状をして、円筒１２の外側に交互に層状に重なり合っており、防食対象物３とは絶縁物７、電極２５を介して台座１５の上に設置している。電極２５は犠牲電極の溶解により発生した電気を防食対象物３に供給するために用いる。円筒部１２の下端は固定用ボルト１１により防食対象物３に固定され、上端はネジの構造になっており、金属製のバネなどの導電性弾性体１４、押さえ用平板１５を介して、ナット１３がネジ部に取り付けられている。ナット１３を締め付けることにより、陽極８、１８、２１と陰極１７，２０、２３と遮断用絶縁物１６、１９、２２は防食対象物３に塗装された塗膜４上に固定される。
【０００９】
最上部の陽極８は押さえ用平板１５と接触しているため、図３に示すように表面に液膜６が形成すると電池を作り電位が発生する。押さえ用平板１５は、導電性弾性体１４、ナット１３、円筒１２、固定用ボルト１１を介して防食対象物３と接しているため、犠牲陽極８は、防食対象物３より高い電位となる。
【００１０】
同様に、陰極１７と陽極１８、陰極２０と陽極２１の間で電池を作り電位が発生するが、その各々は、遮断用絶縁物１６、１９、２２により液膜６が遮断されているため独立した電池となる。そして、導線５により、遮断用絶縁物をはさむ陽極８と陰極１７を、陽極１８と陰極２０を、陽極２１と陰極２３を接続することにより、電池の直列接続となり、陽極８、陽極１８、陽極２１となるに従い、電位がだんだん高くなる。
【００１１】
電極１と防食対象物３の間で発生する電圧は陽極と陰極の枚数に比例して高くなり、通常の大気中環境に設置され表面を塗装した防食対象物３の場合は、１から２０Ｖの範囲となる。防食対象物の表面に形成される液膜の抵抗が低いときに高い電圧を設定すると、電極の枚数が増えて電極が大きくなるだけでなく、電流が流れすぎて電極の周りで過防食となり塗膜の剥離が発生し、塗膜寿命を逆に短くしてしまう。一方、液膜の抵抗が高いときに、低い電圧に設定すると、電流が流れる防食範囲が狭くなり、架台全体を防食するには、多くの電極を設置する必要があり、設置コストが高くなる。陽極８と陽極１８と陽極２１の直接的な接触を防止するために円筒絶縁物２４を設置し、円筒１２と遮断されている。
また、導電性弾性体１４を介して各部位を面接触しているため、陽極８、１８、２１が溶けて小さくなっても、確実に各部位を電気的に接触させることが可能となる。
【００１２】
防食対象物３の材質は電気防食のしやすさと適用が多いため、鉄鋼材料であることが好ましい。
塗膜４の材料は、フェノール樹脂、アクリル樹脂、エポキシ樹脂、ポリウレタン樹脂等を使用できる。
電極１の材料は、アルミニウム、チタン等の導電性がある金属を使用できる。
固定用ボルト１１、円筒１２、ナット１３、導電性弾性体１４、押さえ用平板１５の材質は、導電性があり、犠牲陽極より溶解しにくく、かつ強度がある必要があるため、鉄、ステンレス、チタン等の材料を使用できる。
陽極８、１８、２１の材料は、アルミニウム、マグネシウム、亜鉛を主成分とした合金等を使用できる。
陰極１７、２０、２３の材料は、陽極の材料より貴である金属である鉄、ステンレス、銅等が使用できる。
絶縁物７、遮断用絶縁物１６、１９、２２、円筒絶縁物２４はゴム、樹脂、セラミックス等を使用できる。
電極１と防食対象物３の接続は、図１から図２に示すようにボルト１１である必要はなく、溶接でも防食が可能である。
【００１３】
【実施例】
実施例として、４層構造の犠牲電極を図１から図２に示す。鋼製防食対象物３の表面はエポキシ樹脂で厚さ０．３mmに塗装され、塗膜４上にゴムからなる外径８０mm、内径１０mm、厚さ３mmの絶縁物７を介して外径８０mm、内径３０mm、厚さ１０mmの電極２５を設置した。電極２５の材料は、外径８０mm、内径３０mm、厚さ１０mmの陽極８、１８、２１と同じ材料のマグネシウム電極とし、ネジ部の外径８mm、長さ３０mmの固定用ボルト１１、外径２０mm、内径１５mmの円筒１２、ネジ内径２０mm、厚さ１０mmのナット１３、内径３０mm、厚さ２０mmの導電性弾性物１４、外径８０mm、内径３０mm、厚さ５mmの押さえ用平板１５、外径８０mm、内径３０mm、厚さ５mmの陰極１７、２０、２３の材質はステンレスとした。導電性弾性体１４はバネ構造とし、絶縁物７、外径１２０mm、内径３０mm、厚さ５mmの遮断用絶縁物１６、１９、２２、円筒絶縁物２４の材質はゴムとして、遮断用絶縁物１６の先端は液膜６が遮断されやすいように先端の断面が１０度の鋭角な構造とした。
【００１４】
上記の電極２５と陰極２３、陽極２１と陰極２０、陽極１８と陰極１７、陽極８と押さえ用平板１５の間で電位が発生して、導線５により直列に接続することにより４倍もの電位が、電極２５と防食対象物３の間で発生し、２から３ｍの範囲の電気防食が可能となった。
一方、比較例として、図４に示す１層構造の犠牲電極とし、材質、寸法は実施例と同じものを適用しようとした場合、０．６から１ｍの範囲の防食しかできなくなった。
【００１５】
【発明の効果】
本発明に係る犠牲電極を積層として遮断用絶縁物により液膜を遮断することにより、簡単な構造で高い電位を得ることができ、商用電源からの距離が遠い設備に対しても、安価に安定した防食が可能となる。また、ネジと導電性の弾性体を組み合わせ締め付ける構造とすることにより、犠牲陽極が溶損しても各部を十分な力に接触させることが可能となり安定した電位を得ることができる。
【図面の簡単な説明】
【図１】本発明の犠牲電極の断面図の例である。
【図２】本発明の犠牲電極の平面図の例である。
【図３】本発明の犠牲電極に液膜が形成されたときを示す断面図である。
【図４】従来の大気中電気防食方法の概略を示す図である。
【図５】従来の太陽電池と犠牲電極を組合せた大気中電気防食方法の概略を示す図である。
【符号の説明】
１ ：犠牲電極 ２ ：直流電源
３ ：防食対象物 ４ ：塗膜
５ ：導線 ６：液膜
７ ：絶縁物 ８ ：陽極
９ ：太陽電池 １０：切りかえスイッチ
１１：固定用ボルト １２：円筒
１３：ナット １４：導電性弾性体
１５：押さえ用平板 １６：遮断用絶縁物
１７：陰極 １８：陽極
１９：遮断用絶縁物 ２０：陰極
２１：陽極 ２２：遮断用絶縁物
２３：陰極 ２４：円筒絶縁物
２５：電極[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sacrificial electrode used for anticorrosion of outdoor mechanical equipment, outdoor buildings, and an anticorrosion method using the same.
[0002]
[Prior art]
An outline of a conventional cathodic protection system in the atmosphere is shown in FIG. The anticorrosion object 3 is coated on the metal surface, and the electrode 2 for electrocorrosion protection is a positive electrode and the anticorrosion object 3 is a negative electrode via the insulator 7 on the coating film 4, and the power supply 2 is connected by a conductive wire 5. The metal is iron or the like. Although the anticorrosion current does not flow when the metal surface is dry and no liquid film is formed, there is no need for anticorrosion because no rust is generated in the dry state.
When the paint surface gets wet due to rain or the like and the liquid film 6 is formed, rust develops. However, electricity flows through the liquid film 6 as a medium, and the development of rust due to coating film defects is prevented. The lifespan of this is significantly increased.
[0003]
However, when there is no commercial power supply near the anticorrosion object 3, it is necessary to wire the conductive wire 5 several hundreds m from the power supply to the electrode installation part, and the cost for installation increases significantly. When the conducting wire 5 becomes long, the conducting wire 5 often breaks in the middle, and it becomes difficult to maintain the anticorrosion effect. Moreover, when the area of the anticorrosion object 3 is increased, the number of power supplies that convert alternating current into direct current increases, and the installation cost of wiring and power supplies increases.
[0004]
As a method for solving such a problem, as shown in FIG. 5, a patent that combines a solar cell 9 and a sacrificial anode 8 as a power source is disclosed (Japanese Patent Laid-Open No. 7-316850). In this method, the electricity generated by the solar cell 9 is protected against corrosion when the sun is irradiated, and the electric power generated by melting the sacrificial anode 8 by switching the power source by the switching switch 10 at night or when the sun is not irradiated. This is a method for preventing corrosion. In this method, even in the anticorrosion object 3 far away from the commercial power source, the long conductive wire 5 is not necessary and corrosion protection is possible.
[0005]
However, the voltage generated by the solar cell 9 and the sacrificial anode 8 is as low as 1-2V. When the water film 4 formed on the surface of the coating film 4 is thick and has a low electrical resistance, such as in water or soil to which the sacrificial anode 8 is applied, the anticorrosion in the range of several meters is possible. . On the other hand, the equipment in the atmosphere has a thin liquid film 6 formed on the surface of the coating film 4 having a thin thickness of 1 to 100 μm and a high electrical resistance. Installation costs increase due to the need for installation.
[0006]
[Problems to be solved by the invention]
The above-described conventional technique has a problem that the installation cost increases in proportion to the distance in order to perform the anticorrosion to the anticorrosion target in the atmosphere far from the power source. SUMMARY OF THE INVENTION An object of the present invention is to provide a sacrificial electrode and an anticorrosion method used for atmospheric anticorrosion that can prevent corrosion in a wide range without a commercial power source.
[0007]
[Means for Solving the Problems]
The cathodic protection method of the present invention is as follows.
(1) The sacrificial electrode used for cathodic protection has a laminated structure in which a plurality of anodes, insulating plates and cathodes are stacked in this order, and the cathode and anode sandwiching the insulator are connected by a conductive wire, and the cathode and anode between the insulating plates are electrically connected. (2) It has a fixing means for fixing the sacrificial electrode to the anticorrosive object while pressing the sacrificial electrode from above via the conductive elastic body ( The sacrificial electrode according to 1), (3) the surface of a metal anticorrosion object is coated, and the sacrificial electrode according to (1) or (2) is installed as a positive electrode on the coated surface via an insulator, It is an anticorrosion method characterized by energizing an object as a negative electrode.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The present invention is described in detail below.
The structure of the sacrificial electrode 1 is shown in FIGS. The anodes 8, 18, 21, the cathodes 17, 20, 23 and the blocking insulators 16, 19, 22 have a donut-like shape and are alternately layered on the outside of the cylinder 12, Is installed on the base 15 via the insulator 7 and the electrode 25. The electrode 25 is used to supply electricity generated by the dissolution of the sacrificial electrode to the anticorrosion object 3. The lower end of the cylindrical portion 12 is fixed to the anticorrosion object 3 by a fixing bolt 11, and the upper end has a screw structure, and a nut is formed through a conductive elastic body 14 such as a metal spring and a pressing plate 15. 13 is attached to the threaded portion. By tightening the nut 13, the anodes 8, 18, 21, the cathodes 17, 20, 23 and the shielding insulators 16, 19, 22 are fixed on the coating film 4 coated on the anticorrosion object 3.
[0009]
Since the uppermost anode 8 is in contact with the pressing plate 15, when the liquid film 6 is formed on the surface as shown in FIG. 3, a battery is formed and a potential is generated. Since the holding plate 15 is in contact with the anticorrosion object 3 via the conductive elastic body 14, the nut 13, the cylinder 12, and the fixing bolt 11, the sacrificial anode 8 has a higher potential than the anticorrosion object 3.
[0010]
Similarly, a battery is formed between the cathode 17 and the anode 18 and between the cathode 20 and the anode 21 and a potential is generated. Each of them is independent because the liquid film 6 is blocked by the blocking insulators 16, 19, and 22. Battery. Then, the battery 8 is connected in series by connecting the anode 8 and the cathode 17 sandwiching the blocking insulator, the anode 18 and the cathode 20, and the anode 21 and the cathode 23 with the conductor 5, and the anode 8, anode 18, anode As it becomes 21, the potential gradually increases.
[0011]
The voltage generated between the electrode 1 and the anticorrosion object 3 increases in proportion to the number of anodes and cathodes, and in the case of the anticorrosion object 3 installed in a normal atmospheric environment and coated on the surface, the voltage is 1 to 20V. It becomes a range. If a high voltage is set when the resistance of the liquid film formed on the surface of the anticorrosion object is low, not only will the number of electrodes increase and the electrodes become large, but too much current will flow and overcoating will occur around the electrodes. Peeling of the film occurs, and the life of the coating film is shortened. On the other hand, when the resistance of the liquid film is high, if the voltage is set to a low voltage, the anticorrosion range through which the current flows becomes narrow, and it is necessary to install many electrodes to prevent the entire pedestal, and the installation cost increases. In order to prevent direct contact between the anode 8, the anode 18, and the anode 21, a cylindrical insulator 24 is provided and is isolated from the cylinder 12.
Further, since each part is in surface contact via the conductive elastic body 14, even if the anodes 8, 18, and 21 melt and become small, it is possible to reliably contact each part.
[0012]
The material of the anticorrosion object 3 is preferably an iron and steel material because it is easy to apply anticorrosion and has many applications.
As the material of the coating film 4, a phenol resin, an acrylic resin, an epoxy resin, a polyurethane resin, or the like can be used.
As the material of the electrode 1, a conductive metal such as aluminum or titanium can be used.
The material of the fixing bolt 11, cylinder 12, nut 13, conductive elastic body 14, and pressing plate 15 must be conductive, less soluble than the sacrificial anode, and strong. Materials such as titanium can be used.
As the material of the anodes 8, 18, and 21, alloys such as aluminum, magnesium, and zinc can be used.
As the material of the cathodes 17, 20, and 23, iron, stainless steel, copper, or the like, which is a noble metal than the anode material can be used.
As the insulator 7, the blocking insulators 16, 19, 22 and the cylindrical insulator 24, rubber, resin, ceramics or the like can be used.
The connection between the electrode 1 and the anticorrosion object 3 does not need to be the bolt 11 as shown in FIGS. 1 to 2 and can be prevented by welding.
[0013]
【Example】
As an example, a sacrificial electrode having a four-layer structure is shown in FIGS. The surface of the steel anticorrosive object 3 is coated with an epoxy resin to a thickness of 0.3 mm, and the outer diameter is 80 mm, the inner diameter is 10 mm, and the outer diameter is 3 mm. An electrode 25 having an inner diameter of 30 mm and a thickness of 10 mm was installed. The material of the electrode 25 is a magnesium electrode made of the same material as the anodes 8, 18, and 21 having an outer diameter of 80 mm, an inner diameter of 30 mm, and a thickness of 10 mm, a screw bolt having an outer diameter of 8 mm, a length of 30 mm, and an outer diameter of 20 mm. A cylinder 12 with an inner diameter of 15 mm, a nut 13 with an inner diameter of 20 mm, a nut 13 with a thickness of 10 mm, a conductive elastic material 14 with an inner diameter of 30 mm and a thickness of 20 mm, an outer diameter of 80 mm, an inner diameter of 30 mm, a pressing plate 15 with a thickness of 5 mm, an outer diameter of 80 mm The cathodes 17, 20, and 23 having an inner diameter of 30 mm and a thickness of 5 mm were made of stainless steel. The conductive elastic body 14 has a spring structure. The insulator 7, the outer diameter 120mm, the inner diameter 30mm, and the thickness of the insulating insulators 16, 19, and 22 and the cylindrical insulator 24 are made of rubber, and the insulating insulator 16 is made of rubber. The tip of the tip has a sharp structure with a 10-degree cross section at the tip so that the liquid film 6 is easily blocked.
[0014]
A potential is generated between the electrode 25 and the cathode 23, the anode 21 and the cathode 20, the anode 18 and the cathode 17, the anode 8 and the pressing flat plate 15, and the potential is four times higher by connecting them in series with the conductive wire 5. Occurring between the electrode 25 and the anticorrosion object 3, it was possible to perform anticorrosion in the range of 2 to 3 m.
On the other hand, when a sacrificial electrode having a single-layer structure shown in FIG. 4 was used as a comparative example and the same material and dimensions as those in the example were applied, only corrosion prevention in the range of 0.6 to 1 m could be achieved.
[0015]
【The invention's effect】
By blocking the liquid film with a blocking insulator using the sacrificial electrode according to the present invention as a laminate, a high potential can be obtained with a simple structure, and it is stable at low cost even for equipment far from the commercial power source. Corrosion protection is possible. Further, by adopting a structure in which a screw and a conductive elastic body are combined and tightened, each portion can be brought into contact with a sufficient force even if the sacrificial anode is melted, and a stable potential can be obtained.
[Brief description of the drawings]
FIG. 1 is an example of a sectional view of a sacrificial electrode of the present invention.
FIG. 2 is an example of a plan view of a sacrificial electrode of the present invention.
FIG. 3 is a cross-sectional view showing a liquid film formed on the sacrificial electrode of the present invention.
FIG. 4 is a diagram showing an outline of a conventional atmospheric anticorrosion method.
FIG. 5 is a diagram showing an outline of an atmospheric anticorrosion method combining a conventional solar cell and a sacrificial electrode.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1: Sacrificial electrode 2: DC power supply 3: Corrosion prevention target object 4: Coating film 5: Conductor 6: Liquid film 7: Insulator 8: Anode 9: Solar cell 10: Changeover switch 11: Fixing bolt 12: Cylinder 13: Nut 14: Conductive elastic body 15: Flat plate for pressing 16: Insulating insulator 17: Cathode 18: Anode 19: Insulating insulator 20: Cathode 21: Anode 22: Insulating insulator 23: Cathode 24: Cylindrical insulator 25 :electrode

Claims (3)

電気防食に用いる犠牲電極において、陽極と絶縁板と陰極をこの順に複数重ね合わせた積層構造とし、絶縁物をはさむ陰極と陽極は導線で接続され、絶縁板間の陰極と陽極は電気的に接触していることを特徴とする犠牲電極。The sacrificial electrode used for cathodic protection has a laminated structure in which a plurality of anodes, insulating plates, and cathodes are stacked in this order. The cathode and anode sandwiching the insulator are connected by a conductive wire, and the cathode and anode between the insulating plates are in electrical contact. A sacrificial electrode, characterized in that 導電性弾性体を介して犠牲電極を上部から押圧しながら、防食対象物と固定する固定手段を有することを特徴とする請求項１記載の犠牲電極。2. The sacrificial electrode according to claim 1, further comprising a fixing means for fixing the sacrificial electrode to the anticorrosion object while pressing the sacrificial electrode from above via a conductive elastic body. 金属製の防食対象物の表面を塗装し、塗装表面上に絶縁物を介して請求項１又は２記載の犠牲電極を正極として設置し、防食対象物を負極として通電することを特徴とする電気防食方法。Electricity characterized in that the surface of a metal anticorrosion object is painted, the sacrificial electrode according to claim 1 or 2 is installed as a positive electrode via an insulator on the painted surface, and the anticorrosion object is used as a negative electrode. Anticorrosion method.
JP2001290849A 2001-09-25 2001-09-25 Sacrificial electrode and cathodic protection method Expired - Fee Related JP4638635B2 (en)

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GB0409521D0 (en) * 2004-04-29 2004-06-02 Fosroc International Ltd Sacrificial anode assembly

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59193283A (en) * 1983-04-14 1984-11-01 Nippon Boshoku Kogyo Kk Device for corrosion prevention using galvanic anode
JPH0513103A (en) * 1991-07-05 1993-01-22 Hitachi Ltd High temperature type secondary battery and battery module
JPH07316850A (en) * 1994-05-27 1995-12-05 Okanishi:Kk Corrosion preventive method by solar battery
JPH09242982A (en) * 1996-03-02 1997-09-16 Mitsui Mining & Smelting Co Ltd Anticorrosion method in redestal part of pipe
JPH09268388A (en) * 1996-01-31 1997-10-14 Mitsubishi Heavy Ind Ltd Corrosion preventing device for steel structure and corrosion preventing coating film
JPH108272A (en) * 1996-06-21 1998-01-13 Esuteimu:Kk Mounting device of sacrificial anode member
JPH10251879A (en) * 1997-03-10 1998-09-22 Tac:Kk Simple cathodic protection method of metallic structure and device therefor

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59193283A (en) * 1983-04-14 1984-11-01 Nippon Boshoku Kogyo Kk Device for corrosion prevention using galvanic anode
JPH0513103A (en) * 1991-07-05 1993-01-22 Hitachi Ltd High temperature type secondary battery and battery module
JPH07316850A (en) * 1994-05-27 1995-12-05 Okanishi:Kk Corrosion preventive method by solar battery
JPH09268388A (en) * 1996-01-31 1997-10-14 Mitsubishi Heavy Ind Ltd Corrosion preventing device for steel structure and corrosion preventing coating film
JPH09242982A (en) * 1996-03-02 1997-09-16 Mitsui Mining & Smelting Co Ltd Anticorrosion method in redestal part of pipe
JPH108272A (en) * 1996-06-21 1998-01-13 Esuteimu:Kk Mounting device of sacrificial anode member
JPH10251879A (en) * 1997-03-10 1998-09-22 Tac:Kk Simple cathodic protection method of metallic structure and device therefor

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