Adaptive anti-fouling and anti-corrosion protective cover for marine steel pile zone

Abstract

The invention belongs to the technical field of anti-fouling and anti-corrosion of ocean platforms, and particularly relates to an adaptive anti-fouling and anti-corrosion protective cover for an ocean steel pile zone. Three sections of anti-fouling and anti-corrosion protection covers are arranged according to different ocean zones where the ocean steel piles are located, and the three sections of anti-fouling and anti-corrosion protection covers are the atmosphere protection cover, the light-transmitting layer protection cover and the light-free layer protection cover correspondingly. The ocean steel pile part located above the sea surface is provided with an atmospheric layer protection cover, the ocean steel pile part located on the surface layer of seawater is provided with a light-transmitting layer protection cover, and the ocean steel pile part located on the lower layer of seawater is provided with an ocean matt layer protection cover. The adaptive anti-fouling and anti-corrosion protective cover for the marine steel pile zone is used for prolonging the service life of a marine steel pile. The three-section protective cover is designed according to the depth of the ocean where the steel pile is located, the antifouling and anti-corrosion capacity of the ocean steel pile can be greatly improved through the combined action of the three-section protective cover, and therefore the service life of the ocean steel pile is prolonged, and the structural safety of the ocean steel pile is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of anti-fouling and anti-corrosion of marine platforms, and in particular relates to an anti-fouling and anti-corrosion protective cover adapted to a marine steel pile zone. Background Art

[0002] With the further development and utilization of marine resources, more and more marine engineering facilities are being put into practical application. The status of marine steel piles in the construction of marine platforms, bridge foundations and other projects is becoming increasingly prominent. However, different zones in the ocean have different physical, chemical and biological characteristics. For example, the tidal range zone frequently alternates between dry and wet; the surface of the seawater has sufficient light and a large biomass; the deep sea area faces darkness, high pressure, and low temperature. Traditional single anti-fouling and anti-corrosion measures are difficult to meet the anti-fouling and anti-corrosion needs of marine steel piles in different zones, often leading to partial or overall premature corrosion and biofouling of steel piles, reducing the service life and structural safety of steel piles, and increasing maintenance costs and risks of marine engineering operations. Therefore, it is of great significance to design an anti-fouling and anti-corrosion strategy that is adaptive to the different marine zones where marine steel piles are located.

[0003] FRP is a composite material with glass fiber and its products as reinforcing materials and synthetic resin as matrix material. It has the advantages of light weight, corrosion resistance, and easy construction. It has been used in the development and utilization of marine antifouling and anticorrosion protective covers. However, the antifouling and anticorrosion performance of conventional FRP protective covers in complex marine environments still needs to be improved, and it is difficult to meet the increasingly stringent protection needs of marine engineering. Therefore, according to the characteristics of different nanomaterials, introducing them into steel pile protective covers in different marine environments can give full play to the best performance of nanomaterials and achieve a broader spectrum and more efficient antifouling and anticorrosion effect. Summary of the invention

[0004] In view of the above problems, the present invention provides a marine steel pile zone-adaptive anti-fouling and anti-corrosion protective cover to solve the problem that the existing marine steel pile protective covers have poor anti-fouling and anti-corrosion performance.

[0005] In order to achieve the above object, the specific technical solution provided by the present invention is as follows:

[0006] The invention discloses an anti-fouling and anti-corrosion protective cover adapted to the zones of marine steel piles. Three sections of anti-fouling and anti-corrosion protective covers are arranged according to the different marine zones where the marine steel piles are located, namely, an atmospheric protective cover, a light-transmitting layer protective cover and a lightless layer protective cover.

[0007] Specifically: the marine steel pile part located above the sea surface is provided with an atmospheric protection cover, the marine steel pile part located on the sea surface is provided with a light-transmitting layer protection cover, and the marine steel pile part located under the sea water is provided with a marine lightless layer protection cover, and each protection cover is connected with structural adhesive.

[0008] The light transmittance of the surface layer of seawater is ≥30%; the light transmittance of the lower layer of seawater is ≤30%.

[0009] Among them, the atmospheric protection cover is a silicone resin with added capsaicin, the light-transmitting layer protection cover is a fiberglass with added photocatalytic material, and the lightless layer protection cover is a fiberglass with added nanoenzymes.

[0010] Furthermore, the atmosphere protection cover is a silicone resin with 1%-3% capsaicin added.

[0011] The light-transmitting layer protective cover is made of glass fiber reinforced plastic with 3%-6% CeO2 / ZnO photocatalytic nanomaterial added.

[0012] The matte layer protective cover is made of 4%-8% surface modified Fe з FRP of O4@GO@Pt nanozyme.

[0013] The thickness of the atmosphere protection cover is 2-3 mm, the thickness of the light-transmitting layer protection cover is 3-6 mm, and the thickness of the light-free layer protection cover is 3-6 mm.

[0014] Surface modified Fe з O4@GO@Pt nanozyme was surface-modified by silane coupling agent.

[0015] Optionally, the glass fiber content in the FRP is 40%-60% (mass fraction), which provides basic mechanical strength for the protective cover. The glass fiber is a mixture of continuous glass fiber and chopped glass fiber in a volume ratio of 4:6.

[0016] The present invention has the following beneficial technical effects: the present invention provides a zone-adaptive antifouling and anticorrosion protective cover for marine steel piles for improving the service life of marine steel piles. According to the marine zone where the steel piles are located, it is designed as a three-section protective cover. From top to bottom, the first section is an atmospheric protective cover composed of silicone resin. The silicone resin has excellent tolerance to various chemical substances in the marine environment and can effectively resist adverse climatic conditions such as ultraviolet radiation. At the same time, the silicone resin has extremely low surface energy, which makes its surface highly hydrophobic and can effectively prevent the intrusion of seawater, achieving good antifouling and anticorrosion effects. The second section is a light-transmitting layer protective cover composed of glass fiber reinforced plastics with added photocatalytic materials, which can effectively use sufficient sunlight to produce sufficient active oxygen to decompose organic pollutants and inhibit biological attachment. The third section is a marine lightless layer protective cover composed of glass fiber reinforced plastics with added nanoenzymes, which has the ability to effectively resist bacteria and decompose organic pollutants, can effectively prevent the occurrence of biological fouling, and extend the service life of the protective cover. The three sections of the protective cover work together to greatly improve the antifouling and anticorrosion capabilities of marine steel piles, thereby extending the service life and structural safety of marine steel piles. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural diagram of a zone-adaptive anti-fouling and anti-corrosion protective cover for marine steel piles provided in an embodiment of the present invention, wherein: 1. an atmospheric layer protective cover, 2. a light-transmitting layer protective cover, 3. a lightless layer protective cover. DETAILED DESCRIPTION

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the present invention is further described below in conjunction with the accompanying drawings and embodiments. The purpose of the present invention is to provide a marine steel pile zone adaptive anti-fouling and anti-corrosion protective cover to improve the service life of the marine steel pile structure. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0019] Example 1

[0020] Three sections of anti-fouling and anti-corrosion protection covers are set on the steel piles in Qingdao sea area according to the different marine environment positions of the marine steel piles, namely the atmospheric layer protection cover, the light-transmitting layer protection cover and the light-free layer protection cover (see Figure 1 ).

[0021] Specifically: the marine steel pile part located above the sea surface is provided with an atmospheric protection cover, the marine steel pile part located on the surface of the sea water with a transmittance ≥ 30% is provided with a light-transmitting layer protection cover, and the marine steel pile part located in the dark layer under the sea water with a transmittance ≤ 30% is provided with a lightless layer protection cover, and each protection cover is connected with structural adhesive.

[0022] Specifically, the atmosphere protection cover is a silicone resin with 3% capsaicin added and a thickness of 3mm. First, put the silicone resin into the mixing equipment, turn on the stirring device at a speed of 400r / min, slowly add the pre-weighed capsaicin, and continue stirring to ensure that the capsaicin is evenly dispersed in the silicone resin. Then, heat the mixed silicone resin with capsaicin to an injection molding temperature of 180°C, and inject the material into the mold cavity through an injection molding machine so that the material fills the cavity and solidifies. Finally, clean and treat the surface of the steel pile, and evenly apply epoxy resin adhesive on the contact surface of the protective cover, then press the protective cover on the steel pile and wait for the adhesive to solidify.

[0023] Specifically, the light-transmitting layer protective cover is a glass fiber reinforced plastic with added photocatalytic material, and has a thickness of 5 mm. First, the continuous glass fiber is installed on the corresponding position of the weaving equipment, and the chopped glass fiber is evenly spread on the weaving path of the continuous glass fiber. The continuous glass fiber and the chopped glass fiber are mixed and woven in a volume ratio of 4:6. Then, the resin and the curing agent are evenly mixed in a ratio of 100:2, and then 5% of the CeO2 / ZnO composite material is added. Subsequently, the mixed resin is infiltrated into the woven fiber structure, and the resin is cured to form a solid glass fiber reinforced plastic material, in which the glass fiber content is 50% (mass fraction). Finally, the surface of the steel pile is cleaned and treated, and the epoxy resin adhesive is evenly applied on the contact surface of the protective cover, and then the protective cover is pressed against the steel pile and waits for the adhesive to cure.

[0024] Specifically, the matte layer protective cover is a glass fiber reinforced plastic with surface-modified nanozymes added, with a thickness of 5 mm. First, the continuous glass fiber is installed on the corresponding position of the weaving equipment, and the short glass fiber is evenly spread on the weaving path of the continuous glass fiber. The continuous glass fiber and the short glass fiber are mixed and woven in a volume ratio of 4:6. In addition, Fe з O4@GO@Pt nanomaterials and silane coupling agents were dispersed in an ethanol solution, stirred at 60°C for 5 hours using a magnetic stirrer, and then centrifuged and dried to remove unreacted silane coupling agents and impurities to obtain surface-modified nanozymes. Then, the resin and curing agent were evenly mixed in a ratio of 100:2, and 6% of the surface-modified nanozymes were added. Subsequently, the mixed resin was infiltrated into the woven fiber structure, and the resin was cured to form a solid fiberglass material with a glass fiber content of 50% (mass fraction). Finally, the surface of the steel pile was cleaned and treated, and the epoxy resin adhesive was evenly applied to the contact surface of the protective cover, and then the protective cover was pressed against the steel pile and the adhesive was allowed to cure.

[0025] Comparative Example 1

[0026] An ordinary fiberglass protective cover is provided in one section on the marine steel pile from the sea surface to the dark part under the sea water.

[0027] Comparative Example 2

[0028] The difference from Example 1 is that the light-transmitting layer protective cover is made of fiberglass, the light-free layer protective cover is made of fiberglass, and the rest is the same as Example 1.

[0029] Performance Testing

[0030] The steel piles after antifouling and anticorrosion treatment of Example 1 were used as the experimental group, and the steel piles without antifouling and anticorrosion treatment were used as the control group. Comparative Examples 1 and 2 were used as comparative examples to conduct a 1-year marine antifouling performance test. The test results are shown in Table 1.

[0031] Table 1

[0032]

[0033] As can be seen from Table 1, since Comparative Example 1 did not set different protective covers according to different seawater environments, it suffered from serious corrosion and biofouling problems after one year, and the corrosion and fouling coverage area was as high as 80%. Comparative Example 2 did not add CeO2 / ZnO composite materials to the light-transmitting layer protective cover, resulting in a significant weakening of its antibacterial and antifouling ability, and the lightless layer protective cover did not add surface-modified nanozymes, resulting in more serious attachment of fouling organisms, and the corrosion and fouling coverage area was 65%. Therefore, the embodiment of the present invention is designed into three sections according to the ocean zone where the steel piles are located. The main material of the atmospheric protection cover in the offshore part is silicone resin. The silicone resin itself has a low surface energy and a strong repellent effect on water, which can effectively prevent the intrusion of seawater. The main material of the light-transmitting layer protection cover on the surface of the seawater is fiberglass with added photocatalytic material, which can effectively receive sunlight. At the same time, the fiberglass matrix material is a composite layer composed of high-strength glass fiber and epoxy resin, which further improves the mechanical strength and anti-fouling and anti-corrosion properties of the protection cover. The main material of the dark lightless layer protection cover under the seawater is fiberglass with added nanoenzymes, which has the ability to effectively resist bacteria and decompose organic pollutants, can effectively prevent the occurrence of biological fouling, and extend the service life of the protection cover.

[0034] The above embodiments are only preferred and exemplary. Those skilled in the art can make equivalent technical improvements based on the description of this patent, which are all within the protection scope of this patent.

Claims

1. An adaptive anti-fouling and anti-corrosion protective cover for marine steel pile zones, characterized in that: Three sections of anti-fouling and anti-corrosion protection covers are set up according to the different ocean zones where the marine steel piles are located, namely the atmospheric protection cover, the light-transmitting layer protection cover and the aphotic layer protection cover.

2. The marine steel pile zone adaptive anti-fouling and anti-corrosion protective cover according to claim 1 is characterized in that: The portion of the marine steel pile located above the sea surface is provided with an atmospheric protection cover, the portion of the marine steel pile located on the sea surface is provided with a light-transmitting layer protection cover, and the portion of the marine steel pile located below the sea water is provided with a lightless layer protection cover.

3. The marine steel pile zone adaptive anti-fouling and anti-corrosion protective cover according to claim 2 is characterized in that: The light transmittance of the surface layer of seawater is ≥30%; the light transmittance of the lower layer of seawater is ≤30%.

4. The marine steel pile zone adaptive anti-fouling and anti-corrosion protective cover according to claim 2 is characterized in that: The atmospheric protection cover is made of silicone resin with added capsaicin, the light-transmitting layer protection cover is made of fiberglass with added photocatalytic material, and the lightless layer protection cover is made of fiberglass with added nanoenzymes.

5. The marine steel pile zone adaptive anti-fouling and anti-corrosion protective cover according to claim 2 is characterized in that: The thickness of the atmosphere protection cover is 2-3 mm, the thickness of the light-transmitting layer protection cover is 3-6 mm, and the thickness of the light-free layer protection cover is 3-6 mm.

6. The marine steel pile zone adaptive anti-fouling and anti-corrosion protective cover according to claim 2 is characterized in that: The atmosphere protection cover is a silicone resin with 1%-3% capsaicin added.

7. The marine steel pile zone adaptive anti-fouling and anti-corrosion protective cover according to claim 2 is characterized in that: The light-transmitting layer protective cover is made of glass fiber reinforced plastic with 3%-6% CeO2 / ZnO photocatalytic nanomaterial added.

8. The marine steel pile zone adaptive anti-fouling and anti-corrosion protective cover according to claim 2 is characterized in that: The matte layer protective cover is made of 4%-8% surface modified Fe з FRP of O4@GO@Pt nanozyme.

9. The marine steel pile zone adaptive anti-fouling and anti-corrosion protective cover according to claim 8, characterized in that: Surface modified Fe з O4@GO@Pt nanozyme was surface-modified by silane coupling agent.

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