Corrosion protection device

Abstract

To provide a corrosion prevention device capable of easily replacing a sacrificial anode.SOLUTION: A corrosion prevention device 1A includes a ship body 2, sacrificial anodes 4 attached to the ship body 2 via insulators 3 in a state of being electrically connected to conductive bolts 6 by the bolts 6 and nuts 7 screwed to the bolts 6, and wires 9 for electrically connecting the bolts 6 and the ship body 2. According to this configuration, the sacrificial anode 4 can be easily replaced by removing the nut 7 from the bolt 6.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a corrosion prevention device for preventing corrosion of a ship hull. [Background technology]

[0002] Conventionally, ships have used corrosion prevention devices to prevent corrosion of the hull. In the corrosion prevention device, a corrosion prevention current flows from a sacrificial anode electrically connected to the hull through seawater to the hull. In other words, the sacrificial anode dissolves in seawater, preventing corrosion of the hull.

[0003] For example, Patent Document 1 describes a method in which a sacrificial anode is attached to the hull via an insulator, and the sacrificial anode is electrically connected to the hull by a rod that passes through the insulator and wiring that extends from the rod. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2022-115693 Summary of the Invention [Problem to be solved by the invention]

[0005] When the sacrificial anode is attached to the hull via an insulator, it is desirable to make the sacrificial anode easily replaceable.

[0006] Therefore, an object of the present disclosure is to provide a corrosion protection device that allows for easy replacement of sacrificial anodes. [Means for solving the problem]

[0007] From a first aspect, the present disclosure provides a corrosion protection device comprising: a hull; a sacrificial anode attached to the hull via an insulator while being electrically connected to the bolt by a conductive bolt and a nut threaded onto the bolt; and wiring electrically connecting the bolt and the hull.

[0008] From a second aspect, the present disclosure provides a corrosion protection device comprising a hull, a sacrificial anode attached to the hull via an insulator by a bolt and a nut threaded onto the bolt, and wiring electrically connecting the sacrificial anode to the hull. [Effects of the Invention]

[0009] According to the present disclosure, a corrosion protection device is provided that allows for easy replacement of sacrificial anodes. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1A is a plan view of a corrosion prevention device according to a first embodiment, and FIG. 1B is a cross-sectional view taken along line IB-IB in FIG. 1A. [Figure 2] FIG. 2A is a plan view of a corrosion prevention device according to a modified example of the first embodiment, and FIG. 2B is a cross-sectional view taken along line IIB-IIB in FIG. 2A. [Figure 3] FIG. 3A is a plan view of a corrosion prevention device according to a second embodiment, and FIG. 3B is a cross-sectional view taken along line IIIB-IIIB in FIG. 3A. [Figure 4] FIG. 4A is a plan view of a corrosion prevention device according to a modification of the second embodiment, and FIG. 4B is a cross-sectional view taken along line IVB-IVB in FIG. 4A. [Figure 5] FIG. 5A is a plan view of a corrosion prevention device according to another modified example of the second embodiment, and FIG. 5B is a cross-sectional view taken along line VB-VB in FIG. 5A. DETAILED DESCRIPTION OF THE INVENTION

[0011] First Embodiment 1A shows a corrosion prevention device 1A according to a first embodiment. The corrosion prevention device 1A includes a hull 2 ​​and a sacrificial anode 4 attached to the hull 2 ​​via an insulator 3.

[0012] The sacrificial anode 4 is made of a material that has a lower corrosion potential in seawater than the hull 2. For example, the hull 2 ​​is made of carbon steel, and the sacrificial anode 4 is made of pure zinc, aluminum alloy, magnesium alloy, or the like.

[0013] In this embodiment, the insulator 3 and the sacrificial anode 4 are plate-shaped, and the insulator 3 is layered on the outer surface of the hull 2, and the sacrificial anode 4 is further layered on the insulator 3. In this embodiment, an insulator 31 is also layered on the inner surface of the hull 2.

[0014] In this embodiment, two conductive bolts 6 are used to secure the sacrificial anode 4. However, the number of bolts 6 may be one or three or more. Each bolt 6 penetrates the hull 2 ​​and the insulators 3, 31.

[0015] In this embodiment, the sacrificial anode 4 has a rectangular shape in a plan view, and the two bolts 6 are located on a center line extending in the longitudinal direction of the sacrificial anode 4. However, the positions of the bolts 6 can be changed as appropriate, and four or more bolts 6 may be arranged along the contour of the sacrificial anode 4.

[0016] In this embodiment, the head of each bolt 6 is located outside the hull 2, and a conductive nut 7 is screwed onto the tip of the shank of each bolt 6 located inside the hull 2. However, conversely to this embodiment, the head of each bolt 6 may be located inside the hull 2, and the nut 7 may be screwed onto the tip of the shank of each bolt 6 located outside the hull 2.

[0017] The sacrificial anode 4 is attached to the hull 2 ​​by the bolt 6 and nut 7, while being electrically connected to the bolt 6. In this embodiment, the shank of each bolt 6 is inserted into an insulating sleeve 8 that penetrates the hull 2 ​​and the insulators 3, 31, and the sleeve 8 insulates the shank of the bolt 6 from the hull 2.

[0018] In this embodiment, the sacrificial anode 4 is molded integrally with the conductive sheet 5. The integral molding is performed by insert casting, in which the conductive sheet 5 is set in a mold for the sacrificial anode 4 and a molten material of the sacrificial anode 4 is poured into the mold.

[0019] The conductive sheet 5 is made of a material having a higher corrosion potential in seawater than the sacrificial anode 4. For example, the conductive sheet 5 is made of a material such as carbon steel, a copper alloy, or a nickel alloy.

[0020] The sacrificial anode 4 has two holes 41 that expose the conductive sheet 5 at positions corresponding to the bolts 6. The conductive sheet 5 has through holes through which the shanks of the bolts 6 are inserted. The heads of the bolts 6 come into contact with the conductive sheet 5 in each hole 41, thereby electrically connecting the bolts 6 and the sacrificial anode 4 via the conductive sheet 5.

[0021] The holes 41 may be filled with putty so as to make the surface of the sacrificial anode 4 smooth. This makes it possible to reduce seawater resistance when the ship including the hull 2 ​​propels forward.

[0022] The two bolts 6 are electrically connected to the hull 2 ​​by wiring 9. For example, a crimp terminal may be attached to the tip of the branched portion of the wiring 9 for each bolt 6, and the crimp terminal may be inserted into the bolt 6 and pressed against the insulator 31 by a nut 7. In this case, the wiring 9 is electrically connected to the bolt 6 via the nut 7. Alternatively, the tip of the branched portion of the wiring 9 for each bolt 6 may be joined to the tip surface of the bolt 6, and the joint may be waterproofed. In this case, the wiring 9 may be cut when the sacrificial anode 4 is replaced, and after the sacrificial anode 4 is replaced, the cut portion of the wiring 9 may be rejoined and the joint may be waterproofed.

[0023] In this embodiment, a variable resistor 91 is provided on the wiring 9. A switch for switching on and off electrical conduction may be provided on the wiring 9, or the variable resistor 91 may have the function of switching on and off electrical conduction. However, the variable resistor 91 may be omitted.

[0024] In the corrosion prevention device 1A having the above-described configuration, the sacrificial anode 4 can be easily replaced by removing the nut 7 from the bolt 6.

[0025] Furthermore, in this embodiment, the head of the bolt 6 comes into contact with the conductive sheet 5 integrally formed with the sacrificial anode 4, so that even if the sacrificial anode 4 wears out, electrical connection between the bolt 6 and the sacrificial anode 4 via the conductive sheet 5 can be ensured.

[0026] Furthermore, in this embodiment, the variable resistor 91 is provided in the wiring 9, so that the magnitude of the anticorrosion current can be changed.

[0027] <Modification> 2A and 2B, the bolts 6 may be stud bolts provided on the outer surface of the hull 2. In this case, nuts 7 are threaded onto the shanks of the bolts 6 in the holes 41 of the sacrificial anode 4. A washer-shaped insulator 32 is disposed at the bottom of each hole 41 to insulate the nuts 7 from the conductive sheet 5.

[0028] In the corrosion protection device 1B, wiring 9 electrically connects the sacrificial anode 4 and the hull 2 ​​outside the hull 2. For example, an electric wire may be embedded in the sacrificial anode 4 so that a portion of the electric wire protrudes from the sacrificial anode 4, and after the wiring 9 is joined to the protruding portion of the electric wire, the joint may be waterproofed. Alternatively, the conductive sheet 5 may be extended so as to protrude from the end face of the sacrificial anode 4, and a crimp terminal attached to the tip of the wiring 9 may be connected to the protruding portion of the conductive sheet 5 using a bolt and nut. In this case, the wiring 9 is electrically connected to the sacrificial anode 4 via the conductive sheet 5.

[0029] In the corrosion protection device 1B as well, the sacrificial anode 4 can be easily replaced by removing the nut 7 from the bolt 6. Note that in the corrosion protection device 1B, the bolt 6 does not have to be conductive. Furthermore, if openings are provided in the insulator 3 and the hull 2 ​​that expose the sacrificial anode 4 to the inside of the hull 2, the wiring 9 may electrically connect the sacrificial anode 4 and the hull 2 ​​inside the hull 2.

[0030] Second Embodiment 3A and 3B show a corrosion prevention device 1C according to a second embodiment. In this embodiment, the same components as those in the first embodiment are given the same reference numerals, and redundant explanations will be omitted.

[0031] In this embodiment, an opening 21 is provided in the hull 2, and the opening 21 is covered from the outside of the hull 2 ​​by an insulator 3. In this embodiment, as in the first embodiment, a sacrificial anode 4 is attached to the hull 2 ​​via the insulator 3 by a bolt 6 and a nut 7.

[0032] The bolt 6 and nut 7 are located within the opening 21. Therefore, the insulator 31 and sleeve 8 shown in FIG. 1B are not required.

[0033] A plurality of stud bolts 61 are provided around the opening 21 on the outer surface of the hull 2, while through holes for inserting the stud bolts 61 are provided around the periphery of the insulator 3. The insulator 3 is fixed to the hull 2 ​​by the stud bolts 61 and nuts 71 that screw onto the stud bolts 61.

[0034] In this embodiment, the same effects as in the first embodiment can be obtained.

[0035] <Modification> 4A and 4B, the opening 21 may be covered by an insulator 3 from the inside of the hull 2, and a sacrificial anode 4 may be placed inside the opening 21. If the surface of the sacrificial anode 4 is flush with the outer surface of the hull 2, it is possible to reduce seawater resistance when the ship including the hull 2 ​​is propelled.

[0036] Alternatively, as in another modified corrosion protection device 1E shown in Figures 5A and 5B, a frame 22 may be welded to the inner surface of the hull 2 ​​along the opening 21, and stud bolts 61 may be provided to fix the insulator 3 to this frame 22.

[0037] <Other embodiments> The present disclosure is not limited to the above-described embodiments, and various modifications are possible without departing from the gist of the present disclosure.

[0038] For example, in corrosion protection devices 1A, 1C, 1D, and 1E other than corrosion protection device 1B, the conductive sheet 5 may be omitted, and the head of the bolt 6 may be set within the formwork of the sacrificial anode 4, and the sacrificial anode 4 may be molded integrally with the bolt 6 by cast-in.

[0039] <Summary> In a first aspect, the present disclosure provides a corrosion protection device comprising, from a first aspect, a hull, a sacrificial anode attached to the hull via an insulator while being electrically connected to the bolt by a conductive bolt and a nut threaded onto the bolt, and wiring electrically connecting the bolt and the hull.

[0040] According to the above configuration, the sacrificial anode can be easily replaced by removing the nut from the bolt.

[0041] In a second aspect, in the first aspect, the sacrificial anode may be integrally formed with a conductive sheet made of a material having a higher corrosion potential in seawater than the sacrificial anode, and the bolt head may contact the conductive sheet, thereby electrically connecting the bolt and the sacrificial anode via the conductive sheet. With this configuration, even if the sacrificial anode is consumed, the electrical connection between the bolt and the sacrificial anode via the conductive sheet can be ensured.

[0042] In a third aspect, from a second aspect, the present disclosure provides a corrosion protection device comprising a hull, a sacrificial anode attached to the hull via an insulator by a bolt and a nut threaded onto the bolt, and wiring electrically connecting the sacrificial anode to the hull.

[0043] According to the above configuration, the sacrificial anode can be easily replaced by removing the nut from the bolt.

[0044] As a fourth aspect, in any one of the first to third aspects, a variable resistor may be provided in the wiring, which makes it possible to change the magnitude of the anticorrosion current. [Explanation of symbols]

[0045] 1A, 1B, 1C, 1D, 1E Corrosion prevention device 2. Hull 3. Insulators 4 Sacrificial anode 5 Conductive sheet 6 volts 7 Nuts 9 Wiring 91 Variable resistor

Claims

1. The hull and a sacrificial anode attached to the hull via an insulator in a state electrically connected to the bolt by a conductive bolt and a nut threaded onto the bolt; Wiring electrically connecting the bolt and the hull; A corrosion prevention device comprising:

2. the sacrificial anode is integrally formed with a conductive sheet made of a material having a higher corrosion potential in seawater than the sacrificial anode; The corrosion prevention device according to claim 1 , wherein the bolt and the sacrificial anode are electrically connected via the conductive sheet by the head of the bolt coming into contact with the conductive sheet.

3. The hull and a sacrificial anode attached to the hull via an insulator by a bolt and a nut threaded onto the bolt; Wiring electrically connecting the sacrificial anode and the hull; A corrosion prevention device comprising:

4. The corrosion prevention device according to claim 1 , wherein the wiring is provided with a variable resistor.

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