A sacrificial anode protection device for seawater pipes of ship structures

Abstract

The present invention discloses a sacrificial anode protection device for seawater pipes of ship structures, which relates to the technical field related to material protection. A layer of anti-corrosion coating is applied to 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 the size of the area can be manually controlled. As a result, during the process of gradual corrosion and consumption of the aluminum-gallium alloy anode block, its contact area with seawater gradually increases, and its protective ability gradually increases, 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 prone to self-corrosion during storage in a marine ship, thus causing loss. The anti-corrosion coating can ensure that it will not be lost during storage, reducing maintenance costs.

Description

Technical Field

[0001] The present 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 components 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 ensuring the safe operation of ships and extending 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 a 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 traditional sacrificial anode protection device has a whole piece of anode, which is 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 by the seawater structural pipe, 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 anode corrodes.

[0005] To achieve the above objectives, the present invention provides the following technical solutions: a sacrificial anode protection device for a ship structure seawater pipe, comprising a structural seawater pipe, wherein anode nodes are intermittently provided on the structural seawater pipe, an anode positioning cylinder is provided at the anode node, an aluminum-gallium alloy anode block is embedded in the anode positioning cylinder, a positioning hole is provided at the center of the aluminum-gallium alloy anode block, a positioning bolt is fixedly connected to the anode positioning cylinder, the positioning bolt is welded to the structural 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 provided between the bottom of the aluminum-gallium alloy anode block and the structural seawater pipe;

[0006] The outer surface of the aluminum-gallium alloy anode block is coated with an anti-corrosion coating, and a conductive nail is embedded in the elastic thickened rubber pad, and the conductive nail punctures the anti-corrosion coating when the positioning nut is tightened;

[0007] 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, and scraping grooves are provided around the anode positioning cylinder. The blade of the coating scraper passes through the scraping groove and contacts the side surface of the aluminum-gallium alloy anode block. The coating scraper scrapes the anti-corrosion coating when the rotating sleeve rotates.

[0008] 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, and the remainder.

[0009] Furthermore, an elastic pressing plate is provided under the positioning nut, a metal gasket is provided under the elastic pressing plate, a rubber gasket is provided between the metal gasket and the aluminum-gallium alloy anode block, and the positioning nut, elastic pressing plate and metal gasket are located outside the aluminum-gallium alloy anode block.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] 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 degrees.

[0014] 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 to the scraper groove, and a guide groove is provided on the ridge 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. The pressure spring is located between the coating scraper and the rotating sleeve.

[0015] 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.

[0016] 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%.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention proposes a sacrificial anode protection device for seawater pipes of ship structures. A layer of anti-corrosion coating is applied to 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 manually controlled. As a result, during the process of gradual corrosion and consumption of the aluminum-gallium alloy anode block, its contact area with seawater gradually increases, and its protective ability gradually increases, which is more in line with the protection requirements of seawater structure pipes 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 prone to self-corrosion during storage in offshore ships, thus causing loss. The anti-corrosion coating can ensure that it will not be lost during storage, reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the anode node position of the present invention;

[0020] Figure 2 For the present invention Figure 1 A in the middle is an enlarged structural diagram;

[0021] Figure 3 This is a schematic cross-sectional view of the anode positioning cylinder of the present invention;

[0022] Figure 4 For the present invention Figure 3 The enlarged structural diagram at B in the middle;

[0023] Figure 5 This is a schematic structural diagram of the coating scraper of the present invention;

[0024] Figure 6 This is a schematic diagram of the early stage loss of the aluminum-gallium alloy anode block of the present invention;

[0025] Figure 7 This is a schematic diagram of the mid-term loss of the aluminum-gallium alloy anode block of the present invention;

[0026] Figure 8 This is a schematic diagram of the late-stage loss of the aluminum-gallium alloy anode block of the present invention.

[0027] 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

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0029] like Figure 1-5 As shown, a sacrificial anode protection device for a ship structure seawater pipe includes a structural seawater pipe 1, on which anode nodes 2 are intermittently provided. An anode positioning tube 3 is provided 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. 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 does not contact the inner wall of the positioning hole 5. In this way, 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 the positioning nut 7 through a thread, an elastic pressing plate 8 is provided under the positioning nut 7, a metal gasket 9 is provided under the elastic pressing plate 8, a rubber gasket 10 is provided between the metal gasket 9 and the aluminum-gallium alloy anode block 4, the positioning nut 7, the elastic pressing plate 8 and the metal gasket 9 are located on the outside of the aluminum-gallium alloy anode block 4, and an elastic thickened rubber pad 11 is provided 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.

[0030] 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 the 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 the bottom, and the nail head of the lower end of the conductive nail 13 is in close contact with the outer wall of the structural seawater pipe 1. Therefore, 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, thereby electrically connecting the aluminum-gallium alloy anode block 4 to the structural seawater pipe 1, and starting anode protection.

[0031] 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 through holes 1401. 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, providing reaction conditions for anode sacrificial reaction.

[0032] 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 passes through 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.

[0033] 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°. The upper end of the anode positioning cylinder 3 is etched with a scale line 302, and the scale line 302 indicates the angle range of 0°-60°. The upper end of the rotating sleeve 14 is etched with a triangular indicator 1402, 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.

[0034] 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 to the scraper groove 15. A guide groove 1601 is provided on the spine of the coating scraper 16. The guide column 1501 passes 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 and 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, rotating the rotating sleeve 14 can drive the coating scraper 16 to move and scrape off the anti-corrosion coating 12 in the predetermined area.

[0035] Specifically, the composition ratio of the aluminum-gallium alloy anode block 4 includes:

[0036] Zn, 0.2%;

[0037] In, 0.005%;

[0038] Si, 0.1%;

[0039] Fe, 0.07%;

[0040] Ga, 0.1%;

[0041] Al, remainder.

[0042] Specifically, the composition ratio of the anti-corrosion coating 12 includes:

[0043] Epoxy resin, 60%;

[0044] glass flakes, 20%;

[0045] Quartz powder filler, 15%;

[0046] Modifier, 1.5%;

[0047] Curing agent, 3.5%.

[0048] 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 slit 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 is rotated to drive the coating scraper 16 to scrape off the anti-corrosion coating 12 in the predetermined area in one cut. 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.

[0049] The corrosion consumption process of the aluminum gallium alloy anode block 4 is as follows: Figure 6 、 Figure 7 and Figure 8As 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.

[0050] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "includes," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0051] While 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 these embodiments without departing from the principles and spirit of the invention, and that the scope of the 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 provided on the structural seawater pipe (1), and an anode positioning cylinder (3) is provided at the anode node (2). An aluminum-gallium alloy anode block (4) is embedded in the anode positioning cylinder (3), and a positioning hole (5) is provided at the center of the aluminum-gallium alloy anode block (4). A positioning bolt (6) is fixedly connected in the anode positioning cylinder (3), and the positioning bolt (6) is welded to the structural seawater pipe (1). The positioning bolt (6) passes through the positioning hole (5), and the upper end of the positioning bolt (6) is connected to a positioning nut (7) by a thread, and an elastic thickened rubber pad (11) is provided 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 an anti-corrosion coating (12), and 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; The outer side of the anode positioning cylinder (3) is provided with a rotating sleeve (14), the inner side of the rotating sleeve (14) is provided with a scraper groove (15), 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). The anode positioning cylinder (3) is provided with a scraper groove (301) around the periphery. 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). The coating scraper (16) scrapes the anti-corrosion coating (12) when the rotating sleeve (14) rotates. 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); 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).

2. The sacrificial anode protection device for seawater pipes of a ship structure according to 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%; and Al balance.

3. The sacrificial anode protection device for seawater pipes of a ship structure according to claim 1, characterized in that: An elastic pressing sheet (8) is provided below the positioning nut (7), a metal gasket (9) is provided below the elastic pressing sheet (8), a rubber gasket (10) is provided 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 a ship structure according to claim 1, characterized in that: The diameter of the positioning hole (5) is larger 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 a ship structure 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°.

6. The sacrificial anode protection device for seawater pipes of a ship structure according to claim 1, characterized in that: The scraper groove (15) corresponds to the scraper groove (301), and the scraper groove (15) is provided with six groups at equal angles. A guide column (1501) is fixedly connected in 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).

7. The sacrificial anode protection device for seawater pipes of a ship structure according to claim 1, characterized in that: 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).

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

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