JPS6312945B2 - - Google Patents
Info
- Publication number
- JPS6312945B2 JPS6312945B2 JP53106801A JP10680178A JPS6312945B2 JP S6312945 B2 JPS6312945 B2 JP S6312945B2 JP 53106801 A JP53106801 A JP 53106801A JP 10680178 A JP10680178 A JP 10680178A JP S6312945 B2 JPS6312945 B2 JP S6312945B2
- Authority
- JP
- Japan
- Prior art keywords
- propeller
- corrosion
- hull
- galvanic
- zinc
- 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
Links
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 12
- 239000011701 zinc Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 229910052725 zinc Inorganic materials 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 7
- 238000005536 corrosion prevention Methods 0.000 claims description 3
- 239000010953 base metal Substances 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 description 15
- 230000007797 corrosion Effects 0.000 description 9
- 239000000463 material Substances 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000004210 cathodic protection Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000003902 seawater pollution Methods 0.000 description 1
Description
【発明の詳細な説明】
本発明は、例えば舶用プロペラなどのプロペラ
防食方法の改良に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in corrosion protection methods for propellers, such as marine propellers.
従来の舶用プロペラは耐食性材質でできている
ので、特別に防食対策を施してないが、近年の海
水汚染等により材料の耐食性が問題となつてい
る。特に高力黄銅鋳物製プロペラの腐食が顕著で
あり、この防止対策として外部電源式陰極防食
法、亜鉛、マグネシウム合金等の卑金属を利用し
た流電陽極防食法が行われているが、前者はコス
ト面、後者は後述のように取扱い面及び防食亜鉛
板の汎用性に問題があつた。 Conventional marine propellers are made of corrosion-resistant materials, so no special anti-corrosion measures have been taken, but the corrosion resistance of the materials has become a problem due to seawater pollution in recent years. Corrosion of propellers made of high-strength brass castings is particularly noticeable. To prevent this, cathodic protection using an external power source and galvanic anodic protection using base metals such as zinc and magnesium alloys are used; however, the former is costly. However, the latter had problems in handling and the versatility of the anti-corrosion zinc plate, as described below.
流電陽極防食法では、プロペラを含む軸系は、
回転中は軸表面の油膜等の影響によつて船体と絶
縁状態となり、船体に取りつけられた亜鉛板の防
食効果がプロペラには作用しない。 In the galvanic anodic corrosion protection method, the shaft system including the propeller is
During rotation, the propeller is insulated from the hull due to the oil film on the shaft surface, and the anti-corrosion effect of the zinc plate attached to the hull does not work on the propeller.
そこで、プロペラ自体を防食するため、プロペ
ラキヤツプに防食用亜鉛を鋳込んだりしている
が、これではプロペラごとに特殊型となり、亜鉛
が消耗した場合特別に製作する必要が生じるなど
汎用性に欠けるという欠点がある。 Therefore, in order to prevent corrosion of the propeller itself, anti-corrosion zinc is cast into the propeller cap, but this method lacks versatility, as each propeller has to be of a special type, and if the zinc is consumed, a special one must be manufactured. There is a drawback.
本発明は、このような事情に鑑み、前記流電陽
極法によるプロペラ防食法の問題点を解消する目
的で提案されたもので、亜鉛等の卑金属を利用し
た流電陽極法によりプロペラを防食するに際し、
プロペラキヤツプ外表面及びプロペラボス外表面
に防食用流電陽極を取りつけて回転中のプロペラ
軸系の電位を低くすることにより防食効果を増大
させることを特長とするプロペラ防食方法を提供
する。 In view of these circumstances, the present invention has been proposed for the purpose of solving the problems of the propeller corrosion prevention method using the galvanic anode method. On this occasion,
A method for preventing corrosion of a propeller is provided, which is characterized in that galvanic anodes for corrosion protection are attached to the outer surface of a propeller cap and the outer surface of a propeller boss to lower the electric potential of a rotating propeller shaft system, thereby increasing the anticorrosion effect.
本発明方法によれば、流電陽極が外部に取りつ
けられるため、流電陽極の取りつけ及び交換に際
して何らの付帯工事も不要であり、渠中、海水中
のいずれでも取付け、取外しが容易であるととも
に、市販の規格陽極をそのまま使用できる。 According to the method of the present invention, since the galvanic anode is attached externally, there is no need for any incidental work when attaching or replacing the galvanic anode, and it is easy to attach and remove both in a culvert and in seawater. , commercially available standard anodes can be used as is.
またプロペラキヤツプ側及びプロペラボス側に
取りつけられた流電陽極の併用によつて回転中の
プロペラ軸系の電位を低くして防食効果を高める
ことができる。 Further, by using galvanic anodes attached to the propeller cap side and the propeller boss side, the electric potential of the rotating propeller shaft system can be lowered and the anticorrosion effect can be enhanced.
次に本発明方法の一実施例を図面に基づいて説
明する。図において、１はプロペラ軸、２はプロ
ペラ軸１に装着された舶用プロペラのボス本体、
３はプロペラ翼、４はプロペラ装着用ナツトであ
る。５はボス本体２の端面に取りつけられたプロ
ペラキヤツプで、その端面５ａは平面状に形成さ
れ、そこに設けられたネジ穴に防食用亜鉛板６が
ボルト結合されている。またボス本体表面の船首
側翼間部に設けられたネジ穴に防食用亜鉛板７が
ボルト結合されている。 Next, an embodiment of the method of the present invention will be described based on the drawings. In the figure, 1 is a propeller shaft, 2 is a boss body of a marine propeller attached to the propeller shaft 1,
3 is a propeller blade, and 4 is a propeller mounting nut. Reference numeral 5 denotes a propeller cap attached to the end face of the boss body 2, the end face 5a of which is formed into a flat shape, and a corrosion-proofing zinc plate 6 is bolted to a screw hole provided therein. Further, a corrosion-preventing zinc plate 7 is bolted to a screw hole provided on the surface of the boss body between the wings on the bow side.
海中における舶用プロペラ軸系と船体との電位
は、飽和甘汞基準電極に照合して、夫々−200±
50ｍｖと−750ｍｖ以下となつている。この時の
船体は亜鉛板などの流電陽極によつて十分防食さ
れており、プロペラ軸系も停止中は軸受部分の金
属接触によつて、船体と同一の約−750ｍｖとな
つていて、船体に取りつけられた流電陽極によ
り、船体ともども防食効果が大きい。 The potential of the marine propeller shaft system and the ship's hull in the sea is -200±, respectively, compared to the saturated Amane reference electrode.
50 mv and -750 mv or less. At this time, the hull of the ship was sufficiently protected against corrosion by galvanic anodes such as zinc plates, and when the propeller shaft system was stopped, the metal contact of the bearing part kept it at about -750 mV, the same as the hull. The galvanic anode installed on the hull has a great anti-corrosion effect on both the hull and the hull.
しかし、プロペラ軸系が回転中は軸受部分の油
膜によつて船体とは絶縁状態となり、上記の如
き、電位となつて船体とプロペラ軸系との間に約
500ｍｖの電位差が生じ、防食効果がなくなる。 However, while the propeller shaft system is rotating, it is insulated from the ship's hull due to the oil film on the bearing part, and as described above, an electric potential is generated between the ship's hull and the propeller shaft system.
A potential difference of 500mv will occur, and the anticorrosion effect will be lost.
しかし本実施例では、プロペラキヤツプ端面５
ａ及びボス本体２表面の船首側翼間部に亜鉛板６
及び７を取りつけているため、回転中のプロペラ
軸系と船体との電位差を300ｍｖ以下とすること
ができ、従つて十分な防食効果を保持できる。 However, in this embodiment, the propeller cap end face 5
Zinc plate 6 between the wings on the bow side of the surface of a and the boss body 2
and 7 are installed, the potential difference between the rotating propeller shaft system and the hull can be kept to 300mv or less, and a sufficient anticorrosion effect can therefore be maintained.
また亜鉛板の取りつけ及び交換に際して何らの
付帯工事も不要であつて、渠中、海水中のいずれ
でも取付け、取外しが容易であるとともに、市販
の規格陽極をそのまま使用できる。 Furthermore, no additional work is required when attaching or replacing the zinc plate, and it is easy to attach and remove both in a ditch and in seawater, and a commercially available standard anode can be used as is.
第１図は本発明方法を施した舶用プロペラを示
し、ａは縦断立面図、ｂは右半分を取り去つて示
す左側面図である。
１……プロペラ軸、２……プロペラボス本体、
３……プロペラ翼、４……プロペラ装着用ナツ
ト、５……プロペラキヤツプ、５ａ……プロペラ
キヤツプ端面、６，７……防食用亜鉛板。
FIG. 1 shows a marine propeller to which the method of the present invention has been applied, in which a is a longitudinal sectional elevational view and b is a left side view with the right half removed. 1...Propeller shaft, 2...Propeller boss body,
3... Propeller blade, 4... Propeller mounting nut, 5... Propeller cap, 5a... Propeller cap end face, 6, 7... Anti-corrosion zinc plate.
Claims (1)
プロペラを防食するに際し、プロペラキヤツプ外
表面及びプロペラボス外表面にそれぞれ防食用流
電陽極を取りつけ回転中のプロペラ軸系の電位を
低くすることにより防食効果を増大させることを
特長とするプロペラ防食方法。1. When corrosion-proofing a propeller using a galvanic anode method using base metals such as zinc, corrosion-preventing galvanic anodes are attached to the outer surface of the propeller cap and the outer surface of the propeller boss, respectively, to lower the potential of the rotating propeller shaft system. A propeller corrosion prevention method characterized by increasing the corrosion prevention effect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10680178A JPS5534649A (en) | 1978-08-31 | 1978-08-31 | Preventing method for corrosion of propeller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10680178A JPS5534649A (en) | 1978-08-31 | 1978-08-31 | Preventing method for corrosion of propeller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5534649A JPS5534649A (en) | 1980-03-11 |
| JPS6312945B2 true JPS6312945B2 (en) | 1988-03-23 |
Family
ID=14442967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10680178A Granted JPS5534649A (en) | 1978-08-31 | 1978-08-31 | Preventing method for corrosion of propeller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5534649A (en) |
-
1978
- 1978-08-31 JP JP10680178A patent/JPS5534649A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5534649A (en) | 1980-03-11 |
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