Sacrificial anode protection device of ship structure seawater pipe

Abstract

The invention discloses a sacrificial anode protection device for a ship structure seawater pipe, and relates to the technical field related to material protection, the outer surface of an aluminum gallium alloy anode block is coated with an anti-corrosion coating, the coating of a preset area is scraped, the area where corrosion starts and the range size of the corrosion start can be manually controlled, and the corrosion starting time is shortened. Therefore, in the gradual corrosion and consumption process of the aluminum-gallium alloy anode block, the contact area of the aluminum-gallium alloy anode block and seawater is gradually increased, the protection capability is gradually enhanced, the aluminum-gallium alloy anode block better meets the protection requirement of a seawater structural pipe, and the protection effect is enhanced; and the anti-corrosion coating is easy to self-corrode in the storage process in the marine ship, so that loss is caused, but the anti-corrosion coating can ensure that the anti-corrosion coating cannot be lost in the storage process, so that the maintenance cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field related to material protection, and in particular to a sacrificial anode protection device for a seawater pipe of a ship structure. Background Art

[0002] In the marine environment, metal parts such as seawater pipes of ship structures are corroded by seawater for a long time and are prone to electrochemical corrosion, which can lead to equipment damage, performance degradation, and even safety accidents. Therefore, taking effective anti-corrosion measures is of great significance to ensure the safe operation of ships and extend their service life. The sacrificial anode protection device is based on the principle of electrochemical corrosion. It uses the potential difference between the anode made of more active metal and the protected cathode to form a galvanic cell effect. In the galvanic cell, the anode is corroded first as the negative electrode, thereby protecting the seawater structure pipe as the positive electrode from corrosion.

[0003] Since seawater structural pipes are usually covered with anti-corrosion coatings, the anti-corrosion coatings are intact in the initial stage, and the protection current required for the protection of seawater structural pipes is low. After the seawater structural pipes gradually wear and fail in the later stage, the contact area between the pipeline metal and seawater increases, and the required protection current will also increase accordingly. However, the anodes of traditional sacrificial anode protection devices are all integral and are gradually consumed from the outside to the inside. Therefore, the contact area with seawater decreases as the volume decreases, which will cause the protection current to gradually decrease. This is contrary to the protection circuit change cycle required for seawater structural pipes, which will lead to a reduction in protection effect. Summary of the invention

[0004] The object of the present invention is to provide a sacrificial anode protection device for seawater pipes of ship structures, so as to solve the problem that the protection current of the anode of the traditional sacrificial anode protection device proposed in the above background gradually decreases as the corrosion proceeds.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a sacrificial anode protection device for a ship structure seawater pipe, comprising a structure seawater pipe, anode nodes are intermittently arranged on the structure seawater pipe, an anode positioning cylinder is arranged at the anode node, an aluminum-gallium alloy anode block is embedded in the anode positioning cylinder, a positioning hole is opened in the center of the aluminum-gallium alloy anode block, a positioning bolt is fixedly connected in the anode positioning cylinder, the positioning bolt is welded on the structure seawater pipe, the positioning bolt passes through the positioning hole, a positioning nut is threadedly connected to the upper end of the positioning bolt, and an elastic thickened rubber pad is arranged between the bottom of the aluminum-gallium alloy anode block and the structure seawater pipe; The outer surface of the aluminum-gallium alloy anode block is coated with an anti-corrosion coating, and the elastic thickened rubber pad is embedded with a conductive nail, and the conductive nail pierces the anti-corrosion coating when the positioning nut is tightened; A rotating sleeve is provided on the outer rotating sleeve of the anode positioning cylinder, a scraper groove is provided on the inner side of the rotating sleeve, a coating scraper is embedded in the scraper groove, six coating scrapers are provided around the aluminum-gallium alloy anode block, scraper grooves are provided around the anode positioning cylinder, the blade of the coating scraper penetrates the scraper groove and contacts the side surface of the aluminum-gallium alloy anode block, and the coating scraper scrapes the anti-corrosion coating when the rotating sleeve rotates.

[0006] Furthermore, the composition ratio of the aluminum-gallium alloy anode block includes: Zn, 0.2%; In, 0.005%; Si, 0.1%; Fe, 0.07%; Ga, 0.1%; Al, balance.

[0007] Furthermore, an elastic pressing plate is arranged below the positioning nut, a metal gasket is arranged below the elastic pressing plate, a rubber gasket is arranged between the metal gasket and the aluminum-gallium alloy anode block, and the positioning nut, the elastic pressing plate and the metal gasket are located outside the aluminum-gallium alloy anode block.

[0008] Furthermore, the diameter of the positioning hole is larger than the diameter of the positioning bolt, and the positioning bolt has no contact with the inner wall of the positioning hole.

[0009] Furthermore, the thickness of the elastic thickened rubber pad in an uncompressed state is greater than the length of the conductive nail, the conductive nail penetrates into the elastic thickened rubber pad from below, and the nail head at the lower end of the conductive nail is in close contact with the outer wall of the structural seawater pipe.

[0010] Furthermore, the outer wall of the rotating sleeve is densely provided with seawater through holes, and the seawater through holes cooperate with the scraping grooves to allow external seawater to contact the side of the aluminum-gallium alloy anode block.

[0011] Furthermore, six groups of scraping grooves are evenly arranged around the anode positioning cylinder, and the central angle of each group of scraping grooves is 40°.

[0012] Furthermore, the scraper grooves correspond to the scraper grooves, and six groups of scraper grooves are provided at equal angles. A guide column is fixedly connected in the scraper groove, and a guide groove is provided on the spine of the coating scraper. The guide column passes through the guide groove, and a pressure spring is provided on the outer sleeve of the guide column, and the pressure spring is located between the coating scraper and the rotating sleeve.

[0013] Furthermore, a scale line is etched on the upper end of the anode positioning cylinder, and the scale line indicates an angle range of 0°-60°. A triangular indicator is etched on the upper end of the rotating sleeve, and the triangular indicator is used to indicate the rotation angle of the rotating sleeve.

[0014] Furthermore, the composition ratio of the anti-corrosion coating includes: epoxy resin, 60%; glass flakes, 20%; quartz powder filler, 15%; modifier, 1.5%; and curing agent, 3.5%.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention proposes a sacrificial anode protection device for a seawater pipe of a ship structure. A layer of anti-corrosion coating is coated on the outer surface of an aluminum-gallium alloy anode block. By scraping off the coating in a predetermined area, the area where corrosion starts and its range can be artificially controlled, so that the aluminum-gallium alloy anode block gradually increases its contact area with seawater during the process of gradual corrosion and consumption, and its protection ability is gradually enhanced, which is more in line with the protection requirements of the seawater structure pipe and enhances the protection effect. At the same time, due to the relatively active chemical properties of the aluminum-gallium alloy anode block, it is easy to self-corrode during storage in a marine ship, thus causing loss, while the anti-corrosion coating can ensure that it will not be lost during storage, reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the anode node position of the present invention; Figure 2 For the present invention Figure 1 The enlarged structural diagram at A in the middle; Figure 3 This is a schematic diagram of the cross-sectional structure of the anode positioning tube of the present invention; Figure 4 For the present invention Figure 3 The enlarged structural diagram at B in the middle; Figure 5 It is a schematic diagram of the structure of the coating scraper of the present invention; Figure 6 This is a schematic diagram of the early stage loss of the aluminum-gallium alloy anode block of the present invention; Figure 7 This is a schematic diagram of the mid-term loss of the aluminum-gallium alloy anode block of the present invention; Figure 8 This is a schematic diagram of the late-stage loss of the aluminum-gallium alloy anode block of the present invention.

[0017] Numbers in the figure: 1. Structural seawater pipe; 2. Anode node; 3. Anode positioning cylinder; 301. Scraping groove; 302. Scale line; 4. Aluminum-gallium alloy anode block; 5. Positioning hole; 6. Positioning bolt; 7. Positioning nut; 8. Elastic pressing piece; 9. Metal gasket; 10. Rubber gasket; 11. Elastic thickened rubber pad; 12. Anti-corrosion coating; 13. Conductive nail; 14. Rotating sleeve; 1401. Seawater through hole; 1402. Triangular indicator; 15. Scraper groove; 1501. Guide column; 1502. Pressure spring; 16. Coating scraper; 1601. Guide groove; 17. Initial corrosion groove; 18. Intermediate corrosion groove; 19. Late corrosion groove. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] like Figure 1-5 As shown, a sacrificial anode protection device for a ship structure seawater pipe comprises a structure seawater pipe 1, anode nodes 2 are intermittently arranged on the structure seawater pipe 1, an anode positioning tube 3 is arranged at the anode node 2, an aluminum-gallium alloy anode block 4 is embedded in the anode positioning tube 3, a positioning hole 5 is opened at the center of the aluminum-gallium alloy anode block 4, a positioning bolt 6 is fixedly connected in the anode positioning tube 3, the positioning bolt 6 is welded to the structure seawater pipe 1, the positioning bolt 6 passes through the positioning hole 5, the diameter of the positioning hole 5 is larger than the diameter of the positioning bolt 6, the positioning bolt 6 has no contact with the inner wall of the positioning hole 5, so that the positioning bolt 6 will not damage the anti-corrosion coating 12 on the inner wall of the positioning hole 5, The upper end of the positioning bolt 6 is connected to a positioning nut 7 through a thread, an elastic pressing sheet 8 is arranged below the positioning nut 7, a metal gasket 9 is arranged below the elastic pressing sheet 8, a rubber gasket 10 is arranged between the metal gasket 9 and the aluminum-gallium alloy anode block 4, the positioning nut 7, the elastic pressing sheet 8 and the metal gasket 9 are located on the outside of the aluminum-gallium alloy anode block 4, an elastic thickened rubber pad 11 is arranged between the bottom of the aluminum-gallium alloy anode block 4 and the structural seawater pipe 1, the rubber gasket 10 and the elastic thickened rubber pad 11 isolate and protect the aluminum-gallium alloy anode block 4 from the top and bottom respectively, to prevent the anti-corrosion coating 12 on the surface of the aluminum-gallium alloy anode block 4 from being damaged during the positioning process.

[0020] The outer surface of the aluminum-gallium alloy anode block 4 is coated with an anti-corrosion coating 12, and a conductive nail 13 is embedded in the elastic thickened rubber pad 11. The thickness of the elastic thickened rubber pad 11 in an uncompressed state is greater than the length of the conductive nail 13. The conductive nail 13 penetrates into the elastic thickened rubber pad 11 from below, and the nail head at the lower end of the conductive nail 13 is in close contact with the outer wall of the structural seawater pipe 1, so that under normal circumstances, the tip of the conductive nail 13 is located inside the elastic thickened rubber pad 11. When the positioning nut 7 is tightened, the aluminum-gallium alloy anode block 4 will compress the elastic thickened rubber pad 11, so that the tip of the conductive nail 13 is exposed and pierces the anti-corrosion coating 12, thereby contacting the aluminum-gallium alloy anode block 4, and then the aluminum-gallium alloy anode block 4 is electrically connected to the structural seawater pipe 1, and anode protection begins.

[0021] A rotating sleeve 14 is provided on the outer side of the anode positioning cylinder 3. The outer wall of the rotating sleeve 14 is densely provided with seawater holes 1401. The seawater holes 1401 cooperate with the scraping groove 301 to allow external seawater to contact the side of the aluminum-gallium alloy anode block 4, providing reaction conditions for anode sacrifice.

[0022] A scraper groove 15 is provided on the inner side of the rotating sleeve 14, and a coating scraper 16 is embedded in the scraper groove 15. Six coating scrapers 16 are arranged around the aluminum-gallium alloy anode block 4. Scraping grooves 301 are provided around the anode positioning cylinder 3. The blade of the coating scraper 16 penetrates the scraping groove 301 and contacts the side surface of the aluminum-gallium alloy anode block 4. The coating scraper 16 scrapes the anti-corrosion coating 12 when the rotating sleeve 14 rotates.

[0023] There are six groups of scraping grooves 301 evenly arranged around the anode positioning cylinder 3, and the central angle of each group of scraping grooves 301 is 40°, so that the scraping area is limited to a range within 40°. A scale line 302 is etched on the upper end of the anode positioning cylinder 3, and the scale line 302 indicates an angle range of 0°-60°. A triangular indicator 1402 is etched on the upper end of the rotating sleeve 14, and the triangular indicator 1402 is used to indicate the rotation angle of the rotating sleeve 14, so that the area to be scraped can be accurately controlled as needed.

[0024] The scraper groove 15 corresponds to the scraper groove 301. Six groups of scraper grooves 15 are provided at equal angles. A guide column 1501 is fixedly connected in the scraper groove 15. A guide groove 1601 is provided on the spine of the coating scraper 16. The guide column 1501 runs through the guide groove 1601. A pressure spring 1502 is provided on the outer sleeve of the guide column 1501. The pressure spring 1502 is located between the coating scraper 16 and the rotating sleeve 14, so that the pressure spring 1502 will push the coating scraper 16 to press the blade of the coating scraper 16 against the outer surface of the aluminum-gallium alloy anode block 4. When the aluminum-gallium alloy anode block 4 is placed in the anode positioning cylinder 3, the coating scraper 16 will cut a hole in the anti-corrosion coating 12 on the outer surface of the aluminum-gallium alloy anode block 4. After the installation is completed, the rotating sleeve 14 can be rotated to drive the coating scraper 16 to move and scrape off the anti-corrosion coating 12 in the predetermined area.

[0025] Specifically, the composition ratio of the aluminum-gallium alloy anode block 4 includes: Zn, 0.2%; In, 0.005%; Si, 0.1%; Fe, 0.07%; Ga, 0.1%; Al, remainder.

[0026] Specifically, the composition ratio of the anti-corrosion coating 12 includes: Epoxy resin, 60%; Glass flakes, 20%; Quartz powder filler, 15%; Modifier, 1.5%; Curing agent, 3.5%.

[0027] Working principle: When the aluminum-gallium alloy anode block 4 is placed in the anode positioning cylinder 3, the coating scraper 16 will cut a hole in the anti-corrosion coating 12 on the outer surface of the aluminum-gallium alloy anode block 4. After the installation is completed, the rotating sleeve 14 can be rotated to drive the coating scraper 16 to scrape off the anti-corrosion coating 12 in the predetermined area. The area of ​​the scraped area can be accurately adjusted according to the triangular indicator 1402 and the scale line 302, so that it is convenient to adjust according to needs.

[0028] The corrosion and consumption process of the aluminum-gallium alloy anode block 4 is as follows: Figure 6 , Figure 7 and Figure 8 As shown, in the early life of the aluminum-gallium alloy anode block 4, the corrosion area is small. As the corrosion progresses, the contact area between the aluminum-gallium alloy anode block 4 and seawater gradually increases, so that the protection current also gradually increases, which is consistent with the protection requirements of the seawater structure pipe.

[0029] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sacrificial anode protection device for a ship structure seawater pipe, comprising a structure seawater pipe (1), characterized in that: Anode nodes (2) are intermittently arranged on the structural seawater pipe (1), and an anode positioning tube (3) is arranged at the anode node (2). An aluminum-gallium alloy anode block (4) is embedded in the anode positioning tube (3). A positioning hole (5) is provided at the center of the aluminum-gallium alloy anode block (4). A positioning bolt (6) is fixedly connected to the anode positioning tube (3). The positioning bolt (6) is welded to the structural seawater pipe (1), and the positioning bolt (6) passes through the positioning hole (5). A positioning nut (7) is threadedly connected to the upper end of the positioning bolt (6). An elastic thickened rubber pad (11) is arranged between the bottom of the aluminum-gallium alloy anode block (4) and the structural seawater pipe (1); the outer surface of the aluminum-gallium alloy anode block (4) is coated with a layer of anti-corrosion coating (12). ), a conductive nail (13) is embedded in the elastic thickened rubber pad (11), and the conductive nail (13) punctures the anti-corrosion coating (12) when the positioning nut (7) is tightened; a rotating sleeve (14) is provided on the outer side of the anode positioning cylinder (3), a scraper groove (15) is provided on the inner side of the rotating sleeve (14), and a coating scraper (16) is embedded in the scraper groove (15), six coating scrapers (16) are provided around the aluminum-gallium alloy anode block (4), and scraper grooves (301) are provided around the anode positioning cylinder (3), and the blade of the coating scraper (16) penetrates the scraper groove (301) and contacts the side surface of the aluminum-gallium alloy anode block (4), and the coating scraper (16) scrapes the anti-corrosion coating (12) when the rotating sleeve (14) rotates.

2. A sacrificial anode protection device for seawater pipes of ship structures as claimed in claim 1, characterized in that: The composition ratio of the aluminum-gallium alloy anode block (4) includes: Zn, 0.2%; In, 0.005%; Si, 0.1%; Fe, 0.07%; Ga, 0.1%; Al, balance.

3. The sacrificial anode protection device for seawater pipes of ship structures according to claim 1, characterized in that: An elastic pressing sheet (8) is arranged below the positioning nut (7), a metal gasket (9) is arranged below the elastic pressing sheet (8), a rubber gasket (10) is arranged between the metal gasket (9) and the aluminum-gallium alloy anode block (4), and the positioning nut (7), the elastic pressing sheet (8) and the metal gasket (9) are located outside the aluminum-gallium alloy anode block (4).

4. The sacrificial anode protection device for seawater pipes of ship structures according to claim 1, characterized in that: The diameter of the positioning hole (5) is greater than the diameter of the positioning bolt (6), and the positioning bolt (6) has no contact with the inner wall of the positioning hole (5).

5. The sacrificial anode protection device for seawater pipes of ship structures according to claim 1, characterized in that: The thickness of the elastic thickened rubber pad (11) in an uncompressed state is greater than the length of the conductive nail (13); the conductive nail (13) penetrates into the elastic thickened rubber pad (11) from below; the nail head at the lower end of the conductive nail (13) is in close contact with the outer wall of the structural seawater pipe (1).

6. The sacrificial anode protection device for seawater pipes of ship structures according to claim 1, characterized in that: The outer wall of the rotating sleeve (14) is densely provided with seawater through holes (1401), and the seawater through holes (1401) cooperate with the scraping groove (301) to allow external seawater to contact the side of the aluminum-gallium alloy anode block (4).

7. The sacrificial anode protection device for seawater pipes of ship structures according to claim 1, characterized in that: Six groups of scraping grooves (301) are evenly arranged around the anode positioning cylinder (3), and the central angle of each group of scraping grooves (301) is 40 degrees.

8. The sacrificial anode protection device for seawater pipes of ship structures according to claim 1, characterized in that: The scraper groove (15) corresponds to the scraper groove (301), and six groups of the scraper grooves (15) are provided at equal angles. A guide column (1501) is fixedly connected inside the scraper groove (15), and a guide groove (1601) is provided on the ridge of the coating scraper (16). The guide column (1501) passes through the guide groove (1601), and a pressure spring (1502) is provided on the outer sleeve of the guide column (1501), and the pressure spring (1502) is located between the coating scraper (16) and the rotating sleeve (14).

9. The sacrificial anode protection device for seawater pipes of ship structures according to claim 1, characterized in that: The upper end of the anode positioning cylinder (3) is etched with a scale line (302), the scale line (302) indicating an angle range of 0°-60°, and the upper end of the rotating sleeve (14) is etched with a triangular indicator (1402), the triangular indicator (1402) being used to indicate the rotation angle of the rotating sleeve (14).

10. The sacrificial anode protection device for seawater pipes of ship structures according to claim 1, characterized in that: The composition ratio of the anti-corrosion coating (12) includes: epoxy resin, 60%; glass flakes, 20%; quartz powder filler, 15%; modifier, 1.5%; and curing agent, 3.5%.

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