JP2000273666A - Anodic protection method of chain and anodic protection apparatus therefor - Google Patents
Anodic protection method of chain and anodic protection apparatus thereforInfo
- Publication number
- JP2000273666A JP2000273666A JP11077339A JP7733999A JP2000273666A JP 2000273666 A JP2000273666 A JP 2000273666A JP 11077339 A JP11077339 A JP 11077339A JP 7733999 A JP7733999 A JP 7733999A JP 2000273666 A JP2000273666 A JP 2000273666A
- Authority
- JP
- Japan
- Prior art keywords
- chain
- sacrificial anode
- links
- semi
- link
- 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.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims description 10
- 238000005260 corrosion Methods 0.000 claims abstract description 21
- 230000007797 corrosion Effects 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052751 metal Inorganic materials 0.000 claims description 19
- 239000002184 metal Substances 0.000 claims description 19
- 238000005536 corrosion prevention Methods 0.000 claims 1
- 239000013535 sea water Substances 0.000 abstract description 4
- 230000000149 penetrating effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000004873 anchoring Methods 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 241000251468 Actinopterygii Species 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 238000004210 cathodic protection Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 239000010953 base metal Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000003467 diminishing effect Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Landscapes
- Prevention Of Electric Corrosion (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、海浜、港湾、河川
等において、浮標、ブイ、船舶等を固定又は繋留するた
めに使用する金属製チェーン（鎖）の腐食を抑制する犠
牲陽極を備えたチェーンの流電防食方法及び流電防食装
置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention includes a sacrificial anode for suppressing corrosion of a metal chain used for fixing or mooring a buoy, a buoy, a ship, etc. on a beach, a harbor, a river, or the like. The present invention relates to a galvanic protection method and a galvanic protection device for a chain.
【０００２】[0002]
【従来の技術】従来、港湾等において海上の浮標やブイ
をアンカーに固定又は繋留するために、鋼や鉄等の金属
製チェーン（鎖）が使用されているが、浮標やブイは絶
え間ない波や風を受けて常時特定の方向に力を受けるの
で、強度が高く比較的安価に製造できる金属製のチェー
ンは好適な固定又は繋留具である。しかし、固定又は繋
留用金属製チェーンの一番の問題は耐食性に劣ることで
ある。特に海中で使用される金属製チェーンは劣悪な腐
食環境にあり、腐食が進むと金属製チェーンは表面から
錆が剥落し、次第にやせ細っていく。チェーンは周知の
ように多数のリンク（環）からなり、浮標やブイの移動
でリンク間の接触部が擦り合わさるので、特にその部位
の特に摩耗が著しい。2. Description of the Related Art Conventionally, in order to fix or anchor a buoy or buoy on the sea at a port or the like, a metal chain made of steel or iron has been used, but the buoy or buoy has a constant wave. A chain made of metal, which is always strong in a specific direction in response to wind or wind and has high strength and can be manufactured relatively inexpensively, is a suitable fixing or anchoring tool. However, a major problem with metal chains for anchoring or anchoring is poor corrosion resistance. In particular, metal chains used in the sea are in a poorly corrosive environment. As corrosion progresses, the metal chains rust off from the surface and gradually become thinner. As is well known, a chain is composed of a large number of links (rings), and the movement of a buoy or buoy rubs the contact portions between the links.
【０００３】このようなことから、金属製のチェーンの
材質を改良したり、めっき等の表面処理あるいは塗装な
どの工夫がなされた。しかし、これらの処理によって若
干耐食性は増すが、リンク構造のため接触個所が傷つ
き、めっき膜や塗膜が剥離して腐食が進行するので、海
水等による腐食を防止する決め手にならず、またこれら
の処理はチェーン製造のコストを上昇させる結果となっ
た。また、これに替わるものとしてチェーンを太くし、
耐用期間を延ばす工夫がなされた。しかし、浮標やブイ
は水面又は海面に浮遊又は浮上させる必要があるから、
浮標やブイの浮力を減殺する金属製のチェーンの重量に
は、自ずと制限があった。このため、チェーンの腐食を
抑制する有効な手段がなかった。[0003] For these reasons, the materials of the metal chains have been improved, and surface treatments such as plating or coatings have been devised. However, these treatments slightly increase the corrosion resistance, but the contact points are damaged due to the link structure, and the plating film and coating film are peeled off and the corrosion proceeds, so it is not decisive to prevent corrosion by seawater etc. Has resulted in increased costs for chain manufacturing. Also, as an alternative to this, make the chain thicker,
Some measures were taken to extend the service life. However, buoys and buoys need to float or float on the water or sea,
The weight of metal chains that reduce the buoyancy of buoys and buoys was naturally limited. For this reason, there is no effective means for suppressing the corrosion of the chain.
【０００４】元来、金属製チェーンそのものの価格が安
いため、特にチェーンそのものの防食に力を注ぐことは
なかったといえる。しかし、チェーンの寿命が１〜２年
程度、長いものでも数年しかもたないので交換頻度が高
く、実際には交換コストが増大するという問題を有して
いた。しかも、このようなチェーンは単に固定繋留とい
う問題だけではなく、例えば繋留索（チェーン等）の切
断で重要な航路浮標などが破損あるいは浮遊して機能し
なくなった場合に、船舶の事故につながることがあり、
腐食は軽視できない問題であった。[0004] Originally, since the price of the metal chain itself was low, it can be said that no particular efforts were made to prevent corrosion of the chain itself. However, there is a problem that the replacement frequency is high since the life of the chain is as long as about one to two years, and only several years, so that the replacement cost is actually increased. In addition, such chains are not only a matter of fixed mooring, but also can lead to accidents of ships if important marine buoys etc. break or float due to cutting of mooring lines (chains etc.). There is
Corrosion was a problem that could not be ignored.
【０００５】船舶や岸壁の矢板等の簡便な防食方法とし
て、流電防食（陰極防食、電気防食）法が知られてい
る。これは例えば海水のような電解質環境に置かれた金
属に接触させて、アルミニウム合金、亜鉛、マグネシウ
ムのような卑金属からなる可溶性の電極（犠牲陽極）を
配置し、電子を注入することにより金属を防食する方法
であり、金属表面で還元反応を起こさせ、これによって
金属の溶解反応（酸化反応）を停止させるものである。
この方法は微小な電子の移動という自然の酸化還元反応
を利用するものであるから、上記の船舶や岸壁の矢板等
のように大面積であり、かつ犠牲陽極と被防食板が固定
されたもの又はそれらの位置移動が殆どないものには適
用できるが、チェーンのように接触面積が小さく、かつ
ブイ等の動きに伴なって複数のリンクが位置移動を繰り
返す構造のものに流電防食は不可能と考えられていた。[0005] As a simple method for preventing corrosion of ships and quay sheet piles, a galvanic protection method (cathodic protection, cathodic protection) is known. This involves placing a soluble electrode (sacrificial anode) of a base metal, such as aluminum alloy, zinc, or magnesium, in contact with a metal placed in an electrolyte environment, such as seawater, and injecting the metal by injecting electrons. This is a method of preventing corrosion, in which a reduction reaction is caused on the metal surface, thereby stopping the dissolution reaction (oxidation reaction) of the metal.
Since this method utilizes the natural oxidation-reduction reaction of the transfer of minute electrons, it has a large area like the above-mentioned ship or quay sheet pile, and the sacrificial anode and the plate to be protected are fixed. Or it can be applied to those with little position movement, but galvanic protection is not applicable to a structure with a small contact area such as a chain and a structure in which a plurality of links repeatedly move with the movement of a buoy or the like. Was considered possible.
【０００６】しかも、たとえ流電防食が可能であったと
しても、可溶性の陽極すなわち犠牲陽極の設置が難し
く、ブイや浮標の移動に伴うチェーンの可動性を阻害す
るような設置はかえって問題となり、犠牲陽極の設置に
よってチェーン又はリンクの動きを止めると故障の原因
になるとすら一般には考えらる。このようなことから、
チェーンの流電防食は存在しなかったし、またそのよう
な発想というものもなかった。Moreover, even if galvanic protection is possible, it is difficult to install a soluble anode, that is, a sacrificial anode, and installation that hinders the mobility of the chain due to the movement of a buoy or a buoy becomes a problem. It is generally believed that stopping the movement of the chain or link by the installation of the sacrificial anode may even cause a failure. From such a thing,
There was no galvanic protection of the chain, and there was no such idea.
【０００７】[0007]
【発明が解決しようとする課題】上記の問題点に鑑み、
港湾等において海上の浮標やブイをアンカーに固定又は
繋留するための鋼や鉄等の金属製チェーン（鎖）の腐食
を簡単な機構及び操作により抑制し、チェーンの寿命を
向上させることにより交換頻度を減少させ、コスト低減
とチェーン切断等の事故発生を防止することを課題とす
る。In view of the above problems,
In a harbor, etc., corrosion of metal chains (chains) made of steel or iron for fixing or anchoring buoys or buoys on the sea to anchors is suppressed by a simple mechanism and operation, and the replacement frequency is improved by improving the life of the chains. It is an object to reduce costs and prevent occurrence of accidents such as chain breakage.
【０００８】[0008]
【課題を解決するための手段】本発明者は従来考慮され
なかった流電防食をチェーンに適用することにより、防
食効果を高めることができるとの知見を得た。この知見
に基づき、本発明は、（１）少なくとも一部が海中又は
水中に浸漬される金属製チェーンの１リンク又は複数リ
ンクに亘って犠牲陽極を付設したことを特徴とするチェ
ーンの流電防食方法、（２）犠牲陽極を少なくともアン
カー近傍又は浮標若しくはブイ近傍のチェーンに付設し
たことを特徴とする（１）記載のチェーンの流電防食方
法、（３）少なくとも一部が海中又は水中に浸漬される
金属製チェーンの１リンク又は複数リンクの片面又は両
面を包込む犠牲陽極を備えていることを特徴とするチェ
ーンの流電防食装置、（４）犠牲陽極の外形が卵形又は
楕円球若しくは球形であることを特徴とする（３）載の
チェーンの流電防食装置、（５）犠牲陽極がボルトによ
り固定する分割型であることを特徴とする（３）又は
（４）記載のチェーンの流電防食装置、（６）犠牲陽極
の内部にチェーンのリンクが挿入できる孔又は空隙を有
することを特徴とする（３）〜（５）のそれぞれに記載
のチェーンの流電防食装置、を提供するものである。Means for Solving the Problems The present inventor has found that the application of galvanic protection, which has not been considered in the past, to a chain can enhance the corrosion protection effect. Based on this finding, the present invention provides (1) a galvanic protection of a chain, wherein a sacrificial anode is provided over one or more links of a metal chain at least partially immersed in the sea or water. (2) a method of galvanic protection of a chain according to (1), wherein the sacrificial anode is attached to at least a chain near an anchor or a buoy or a buoy; (3) at least a part is immersed in the sea or water. A sacrificial anode enclosing one or both surfaces of one or more links of the metal chain to be formed, (4) the sacrificial anode has an oval or elliptical sphere or (3) The galvanic protection device for a chain described in (3), wherein the sacrificial anode is a split type in which the sacrificial anode is fixed by bolts. (3) or (4). (6) a galvanic corrosion protection device for a chain according to any one of (3) to (5), wherein the sacrificial anode has a hole or a gap into which a link of the chain can be inserted; Is provided.
【０００９】[0009]
【発明の実施の形態】次に、本発明の実施例を図面等を
用いて説明する。なお、本実施例は本発明の理解を容易
にするための好適な１例を示すものであり、これらの例
によって本発明が制限されるものではない。すなわち、
本発明の技術思想の範囲にある他の態様および例は、当
然本発明に含まれる。Next, embodiments of the present invention will be described with reference to the drawings. Note that the present embodiment shows a preferred example for facilitating understanding of the present invention, and the present invention is not limited by these examples. That is,
Other embodiments and examples within the technical concept of the present invention are naturally included in the present invention.
【００１０】図１〜図４に海中又は水中に浸漬される金
属製チェーン１の１リンク（環）又は複数のリンクに亘
って犠牲陽極２を付設した例を示す。ここで使用する海
中又は水中は河川や湖沼さらには淡海水性の湖を含む
が、特に海水における防食に効果的である。犠牲陽極の
材料としてはアルミニウム合金、マグネシウム、亜鉛な
どを使用する。このチェーン１の一部又は全部を海中又
は水中に浸漬して、一端をブイ又は浮標等に繋留し、他
端を海底又は水底のアンカー等に固定する。チェーンが
複数に分岐している場合も同様である。このチェーンは
ブイや浮標に限らずシーバース、人工島、桟橋、ポンツ
ーン、オイルフエンス、シールドフエンス、養殖魚網、
生け簀等の海洋構造物や船舶を繋留する場合に適用でき
る。FIGS. 1 to 4 show examples in which a sacrificial anode 2 is provided over one link (ring) or a plurality of links of a metal chain 1 immersed in the sea or water. The sea or water used herein includes rivers, lakes and marshes, and freshwater lakes, and is particularly effective in preventing corrosion in seawater. As a material for the sacrificial anode, an aluminum alloy, magnesium, zinc, or the like is used. Part or all of the chain 1 is immersed in the sea or water, one end of which is anchored to a buoy or buoy, and the other end is fixed to an anchor on the seabed or underwater. The same applies to a case where the chain is branched into a plurality. This chain is not limited to buoys and buoys, sea berths, artificial islands, piers, pontoons, oil fences, shield fences, farmed fish nets,
It can be applied to mooring offshore structures such as fish cages and ships.
【００１１】多数のリンクが結合したチェーンは接触面
積が小さく、またブイ等の動きに伴なって複数のリンク
が位置移動を繰り返すので、著しく通電性が悪く流電防
食は不可能と考えられたが、チェーンそのものの重量を
個々のリンクで受け、また風や波でブイ等の移動により
チェーンが張力を受けるので、リンク間で安定した接触
が保たれることが、実地試験（通電測定）で確認でき
た。図１〜図４に犠牲陽極２の１例を示す。ブイ又は浮
標等に固定するチェーンの取扱い上及び防食効果を高め
るために、チェーンの形状に馴染む卵形又は楕円球（ラ
グビーボール状）若しくは球形が望ましい。防食性とい
う観点のみから見ると、矩形又は角形のものでも良い
が、作業員の切り傷などの発生防止又は後述するチェー
ンに付着した貝殻等の海生物除去のためには、上記のよ
うに丸みを有しているのが好ましいと言える。また、上
記形状は外形がほぼ卵形又は楕円球若しくは球形を有す
るものを指すのであって、リンク等に結合するために形
成する幾つかの凹凸による変形は当然本発明の形状に含
まれる。[0011] Since a chain in which a large number of links are connected has a small contact area and a plurality of links repeatedly move in position with the movement of a buoy or the like, it is considered that current conduction is remarkably poor and galvanic protection is impossible. However, the chain itself receives the weight of the chain itself at each link, and the chain receives tension due to the movement of the buoy etc. due to wind and waves, so that stable contact between the links can be maintained by a field test (power measurement). It could be confirmed. 1 to 4 show an example of the sacrificial anode 2. FIG. In order to improve the handling of the chain fixed to a buoy or a buoy or the like, and to enhance the anticorrosion effect, an oval shape, an elliptical sphere (rugby ball shape) or a spherical shape that conforms to the shape of the chain is desirable. From the viewpoint of anticorrosion properties only, a rectangular or square shape may be used.However, in order to prevent the occurrence of cuts or the like and to remove sea creatures such as shells attached to a chain described later, the roundness is used as described above. It can be said that it is preferable to have. Further, the above-mentioned shape refers to a shape having an almost oval, elliptical sphere, or spherical shape, and deformation due to some unevenness formed for coupling to a link or the like is naturally included in the shape of the present invention.
【００１２】犠牲陽極２のチェーンへの取付け位置には
特に制限ないが、防食効果を上げるために適当な間隔を
開けて複数取付けるのがよい。垂設チェーンの場合、水
中観察の結果、特に動きの激しい個所はアンカー近傍又
は浮標若しくはブイ近傍のチェーン、すなわち上部取付
け位置と下部取付け位置であることが分かった。したが
って、このような位置に該チェーンの動きに支障となら
ない形状の犠牲陽極を設置することが有効である。There are no particular restrictions on the position at which the sacrificial anodes 2 are attached to the chain, but it is preferable that a plurality of sacrificial anodes 2 be attached at appropriate intervals in order to enhance the anticorrosion effect. In the case of the hanging chain, as a result of underwater observation, it was found that the location where the movement was particularly severe was the chain near the anchor or the buoy or buoy, that is, the upper mounting position and the lower mounting position. Therefore, it is effective to provide a sacrificial anode having such a shape that does not hinder the movement of the chain at such a position.
【００１３】図３及び図４に、チェーン１に犠牲陽極２
を付設した詳細図を示す。この犠牲陽極２は２個の半楕
円球３、４からなり、これらの半楕円球３、４によりほ
ぼ中央位置にリンク５を幅方向に挟み、半楕円球３、４
の両サイドを貫通するボルト・ナット６、７により固定
されている。このボルト・ナット６、７により、犠牲陽
極２の部分交換が可能である。リンク５の両サイドには
リンク８、９があるが、本例では半楕円球３、４の犠牲
陽極はリンク８、９の約半分〜３／４程度を覆う形に構
成されている。半楕円球３、４の平坦面側には中央のリ
ンク５及び両サイドのリンク８、９が嵌まる形状の孔又
は空隙部１０を有する。また、半楕円球３、４の外側に
は固定するためのボルト・ナット用のボルト穴１１と座
繰り又は切り欠き部１１'を有する。図２に示すよう
に、チェーンの種類によってはスタットと称している補
強材１２を取付けたチェーンもあるが、上記のようにリ
ンクの外側をボルト・ナット６、７で固定する構造なの
で、このような構造のリンクであっても犠牲陽極を問題
なく取付けることができる。FIGS. 3 and 4 show a sacrificial anode 2
FIG. The sacrificial anode 2 is composed of two semi-elliptical spheres 3 and 4. The semi-elliptical spheres 3 and 4 sandwich the link 5 at a substantially central position in the width direction.
Are fixed by bolts and nuts 6 and 7 penetrating both sides of. The bolts and nuts 6 and 7 allow the sacrificial anode 2 to be partially replaced. Links 8 and 9 are provided on both sides of the link 5. In this example, the sacrificial anodes of the semi-elliptic spheres 3 and 4 are configured to cover about half to ３ of the links 8 and 9. The flat surfaces of the semi-elliptic spheres 3 and 4 have holes or voids 10 into which the center link 5 and the links 8 and 9 on both sides fit. Further, outside the semi-elliptic spheres 3 and 4, there are provided a bolt hole 11 for bolt and nut for fixing and a counterbore or notch 11 '. As shown in FIG. 2, depending on the type of the chain, there is a chain to which a reinforcing member 12 called a stat is attached. However, since the outside of the link is fixed by the bolts and nuts 6 and 7 as described above, such a structure is used. The sacrificial anode can be attached without any problem even if the link has a simple structure.
【００１４】この例においては陽極犠牲２により、中央
のリンク５及び両サイドのリンク８、９を拘束すること
になるが、水中観察の結果、チェーン１全体の動きに殆
ど影響を与えることはなく、チェーン１としての機能を
阻害することはない。犠牲陽極２の形状において、楕円
球の短径を大きくして膨らみを持たせ耐食性を持続させ
ることもできるが、水流抵抗が増大しチェーン１の重量
も増大するので、用途に応じて適宜調節する。In this example, the center link 5 and the links 8 and 9 on both sides are restrained by the anode sacrificial 2, but as a result of underwater observation, the movement of the entire chain 1 is hardly affected. However, the function as the chain 1 is not hindered. In the shape of the sacrificial anode 2, the minor axis of the elliptical sphere can be enlarged to give a bulge to maintain the corrosion resistance, but since the water flow resistance increases and the weight of the chain 1 increases, it is appropriately adjusted according to the application. .
【００１５】また、平行に配置した多段式のローラにチ
ェーン１を通過させ、チェーン１に付着した貝類等の海
生物を除去する装置（本発明者が先に開発した装置：特
願平１１−９２５５）を用いる場合、チェーン１の通過
が可能であるチェーン１の外形に沿った形状の楕円球
（長円球）であることが望ましい。これらのことから、
図に示すような楕円球は好適な犠牲陽極と言える。この
半楕円球３、４の長円側を長くすることにより、さらに
上記に隣接する複数のリンクを覆うようにすることもで
きる。しかし、それによってリンクすなわち全体として
のチェーン１の自由な移動を妨げることになり易いの
で、チェーン１の用途に合わせて半楕円球３、４の長さ
を調節する。より防食効果を高めるためには、チェーン
１の自由な移動を妨げないように、半楕円球３、４の長
円側をなるべく短くして、多数個の犠牲陽極を設置する
のがよい。An apparatus for removing the sea creatures such as shells attached to the chain 1 by passing the chain 1 through multi-stage rollers arranged in parallel (an apparatus previously developed by the present inventor: Japanese Patent Application No. Hei 11-118). 9255), an elliptical sphere (elliptical sphere) shaped along the outer shape of the chain 1 through which the chain 1 can pass is desirable. from these things,
An elliptical sphere as shown in the figure is a suitable sacrificial anode. By making the elliptical sides of the semi-elliptic spheres 3 and 4 longer, it is possible to further cover the plurality of adjacent links. However, the length of the semi-elliptical spheres 3 and 4 is adjusted according to the use of the chain 1 because it tends to hinder the free movement of the link, that is, the chain 1 as a whole. In order to further enhance the anticorrosion effect, it is preferable to install a large number of sacrificial anodes by shortening the long sides of the semi-elliptic spheres 3 and 4 as much as possible so as not to hinder the free movement of the chain 1.
【００１６】犠牲陽極２の使用に際しては、チェーン１
とリンク５との結合の安定性を持続させるために、半楕
円球３、４の外側から腐食溶解していくことが望ましい
ので、内面の腐食溶解を遅延させるために、半楕円球
３、４の内側（裏）すなわち平坦面を塗装することもで
きる。これによって、犠牲陽極２の固定部の形状を保ち
ながら、外側から全体的に平均化されて腐食摩耗してい
く。但し、過剰な塗装は初期の流電を妨げるので、塗装
の厚さは適宜調節することが必要である。上記について
はリンクの両面について説明したが、用途によっては片
側（片面）のみに犠牲陽極２を設置することもできる。When using the sacrificial anode 2, the chain 1
In order to maintain the stability of the connection between the semi-elliptic spheres 3 and 4, it is desirable to perform corrosion dissolution from the outside of the semi-elliptic spheres 3 and 4. Can be painted on the inside (back), that is, the flat surface. As a result, the shape of the fixed portion of the sacrificial anode 2 is maintained, and the wear is uniformly averaged from the outside and corroded. However, since excessive coating hinders the initial current flow, it is necessary to appropriately adjust the thickness of the coating. Although the above description has been made on both sides of the link, the sacrificial anode 2 may be provided only on one side (one side) depending on the application.
【００１７】[0017]
【発明の効果】本発明は、従来不能と考えられていた流
電防食方法をチェーンに適用することにより、効果的に
耐食性を向上させることができる著しい効果を有する。
犠牲陽極はそれによる重量増及び水流の抵抗を極力低減
させ、チェーンへの取付けを容易にするとともに、チェ
ーンの動きすなわち機能を減殺することなく流電防食を
効果的に持続させることができる。また、チェーンの形
状に馴染む犠牲陽極の形状を有しているので、チェーン
に付着した貝等の海生物の除去を機械的に行う場合に
も、この犠牲陽極が障害となることがないという作業性
にも優れ、さらに丸みを帯びた犠牲陽極は作業の安全を
効上させる特徴を有する。さらに、アンカー取付けピー
ス等の複雑形状の部位にも、通電による防食効果が及
び、チェーンの交換頻度が減少し、チェーンの切断によ
るブイ、浮標等の浮遊等の事故が減少し、全体として安
全性の効上とコスト低減という優れた効果を有する。The present invention has a remarkable effect that the corrosion resistance can be effectively improved by applying a galvanic protection method which has been considered impossible in the past to a chain.
The sacrificial anode minimizes the weight increase and the resistance to water flow, thereby facilitating the attachment to the chain and effectively maintaining galvanic protection without diminishing the movement or function of the chain. In addition, since the shape of the sacrificial anode conforms to the shape of the chain, the sacrificial anode does not become an obstacle even when mechanically removing sea life such as shells attached to the chain. The rounded sacrificial anode is also excellent in performance and has a feature that makes the work safety effective. In addition, the anti-corrosion effect of energization also affects parts with complex shapes such as anchor attachment pieces, reducing the frequency of chain replacement, and reducing accidents such as buoys and buoys floating due to chain cutting, resulting in overall safety. And has an excellent effect of cost reduction.
【図１】犠牲陽極を付設したチェーンの概観説明図であ
る。FIG. 1 is a schematic explanatory view of a chain provided with a sacrificial anode.
【図２】犠牲陽極の概略断面説明図である。FIG. 2 is a schematic sectional explanatory view of a sacrificial anode.
【図３】犠牲陽極と中心リンク及び隣接リンクの正面図
である。FIG. 3 is a front view of a sacrificial anode, a center link, and an adjacent link.
【図４】図３の平面図である。FIG. 4 is a plan view of FIG. 3;
１ チェーン ２ 陽極犠牲 ３、４ 半楕円球 ５ 中央のリンク ６ ボルト ７ ナット ８、９ 両サイドのリンク １０ 孔又は空隙部 １１ ボルト穴 １１' 座繰り又は切り欠き部 １２ 補強材 Reference Signs List 1 chain 2 anode sacrifice 3, 4 semi-elliptical sphere 5 center link 6 bolt 7 nut 8, 9 link on both sides 10 hole or void 11 bolt hole 11 'counterbore or notch 12 reinforcing material
Claims (6)
れる金属製チェーンの１リンク又は複数リンクに亘って
犠牲陽極を付設したことを特徴とするチェーンの流電防
食方法。1. A galvanic corrosion prevention method for a chain, wherein a sacrificial anode is provided over one or more links of a metal chain at least partially immersed in the sea or water.
浮標若しくはブイ近傍のチェーンに付設したことを特徴
とする請求項１記載のチェーンの流電防食方法。2. The method according to claim 1, wherein the sacrificial anode is attached to at least a chain near an anchor or a buoy or a buoy.
れる金属製チェーンの１リンク又は複数リンクの片面又
は両面を包込む犠牲陽極を備えていることを特徴とする
チェーンの流電防食装置。3. A galvanostatic protection device for a chain, comprising a sacrificial anode enclosing one or both surfaces of one or more links of a metal chain at least partially immersed in the sea or water.
は球形であることを特徴とする請求項３記載のチェーン
の流電防食装置。4. The galvanic corrosion protection device for a chain according to claim 3, wherein the outer shape of the sacrificial anode is oval, elliptical sphere, or spherical.
であることを特徴とする請求項３又は４記載のチェーン
の流電防食装置。5. The galvanic protection device for a chain according to claim 3, wherein the sacrificial anode is of a split type fixed by bolts.
入できる孔又は空隙を有することを特徴とする請求項３
〜５のそれぞれに記載のチェーンの流電防食装置。6. A sacrificial anode having holes or voids into which links of a chain can be inserted.
6. The galvanic protection device for a chain according to any one of to 5 above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11077339A JP2000273666A (en) | 1999-03-23 | 1999-03-23 | Anodic protection method of chain and anodic protection apparatus therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11077339A JP2000273666A (en) | 1999-03-23 | 1999-03-23 | Anodic protection method of chain and anodic protection apparatus therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000273666A true JP2000273666A (en) | 2000-10-03 |
Family
ID=13631173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11077339A Withdrawn JP2000273666A (en) | 1999-03-23 | 1999-03-23 | Anodic protection method of chain and anodic protection apparatus therefor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000273666A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008103595A1 (en) * | 2007-02-21 | 2008-08-28 | Lenard Spears | Retrievable surface installed cathodic protection for marine structures |
| RU2692292C1 (en) * | 2015-12-10 | 2019-06-24 | Катерпиллар Глобал Майнинг Юроп Гмбх | Connection of scraper - clamping device - chain link for chain conveyor |
| WO2022265512A1 (en) * | 2021-06-17 | 2022-12-22 | Imenco Corrosion Technology As | Device, system and method for protecting a subsea mooring chain from corrosion |
-
1999
- 1999-03-23 JP JP11077339A patent/JP2000273666A/en not_active Withdrawn
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008103595A1 (en) * | 2007-02-21 | 2008-08-28 | Lenard Spears | Retrievable surface installed cathodic protection for marine structures |
| US7635237B2 (en) | 2007-02-21 | 2009-12-22 | Lenard Spears | Retrievable surface installed cathodic protection for marine structures |
| RU2692292C1 (en) * | 2015-12-10 | 2019-06-24 | Катерпиллар Глобал Майнинг Юроп Гмбх | Connection of scraper - clamping device - chain link for chain conveyor |
| US11040833B2 (en) | 2015-12-10 | 2021-06-22 | Caterpillar Global Mining Europe Gmbh | Flight bar-clamp-chain link connection for a chain conveyor |
| WO2022265512A1 (en) * | 2021-06-17 | 2022-12-22 | Imenco Corrosion Technology As | Device, system and method for protecting a subsea mooring chain from corrosion |
| CN117561199A (en) * | 2021-06-17 | 2024-02-13 | 伊曼口腐蚀技术有限公司 | Devices, systems and methods for protecting underwater mooring chains from corrosion |
| JP2024524178A (en) * | 2021-06-17 | 2024-07-05 | イメンコ コロージョン テクノロジー エーエス | Apparatus, system and method for protecting submarine mooring chains from corrosion - Patents.com |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4415293A (en) | Offshore platform free of marine growth and method of reducing platform loading and overturn | |
| US4089767A (en) | Anode system for the cathodic protection of off shore structures | |
| US4941775A (en) | Cathodic protection of critical offshore marine structure critical components by making the critical component noble (passive) to the balance of the platform | |
| JP5745905B2 (en) | Floating body mooring device | |
| JP7462895B2 (en) | Submarine cable with buoyancy and floating offshore wind power generation system | |
| CN107245980A (en) | A kind of backing formula multilayer energy dissipating floating breakwater | |
| US20150259807A1 (en) | Detachable Retrievable Outboard System and Apparatus for Sacrificial Anodes. | |
| GB2194962A (en) | Cathodic protection of metal surfaces | |
| Fang et al. | Corrosion control technologies for aluminum alloy vessel | |
| CN207193877U (en) | A kind of backing formula multilayer energy dissipating floating breakwater | |
| EP1273360A2 (en) | Apparatus for removing marine organisms and the like | |
| JP2000273666A (en) | Anodic protection method of chain and anodic protection apparatus therefor | |
| US4612869A (en) | Anchor system | |
| CN114906280A (en) | Offshore floating photovoltaic mooring structure | |
| US4409081A (en) | Sacrificial anode | |
| Powell | Copper-nickel sheathing and its use for ship hulls and offshore structures | |
| MacLeod | In-situ corrosion studies on iron and composite wrecks in South Australian waters: implications for site managers and cultural tourism | |
| US20240240326A1 (en) | Device, system and method for protecting a subsea mooring chain from corrosion | |
| CN109989383A (en) | Dedicated unit for floating breakwater connection | |
| US20150159281A1 (en) | Cathodic Protection Device with Joining Mechanisms and Articulated Bars | |
| Schmitt et al. | Corrosion performance of constructional steels in marine applications | |
| WO2018192128A1 (en) | Engineering ship and underwater material transportation and assembly method | |
| CN210216295U (en) | Special device for floating breakwater connection | |
| JPS5942130B2 (en) | Installation method for bottom-mounted offshore structures | |
| CN222008062U (en) | An anti-corrosion cathodic protection device for offshore wind power steel structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20060606 |