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CN-122013820-A - Construction method of anti-corrosion coating of offshore wind power pile foundation steel pile

CN122013820ACN 122013820 ACN122013820 ACN 122013820ACN-122013820-A

Abstract

The invention provides a construction method of an anti-corrosion coating layer of a foundation steel pile of an offshore wind power pile, which simplifies the traditional complex multi-site coating process into a standardized installation process by adopting a flexible composite sheet formed by an adhesive layer, a fiber reinforcing layer and a fluorocarbon resin protective layer through a gradient hot-pressing composite process. Not only remarkably improves the construction efficiency and quality controllability, shortens the offshore operation period, but also realizes the ultra-strong marine environment corrosion resistance, impact resistance and lasting bonding performance by virtue of the innovative composite structure of the coating material, thereby providing an efficient, reliable and ultra-long-service-life anticorrosion protection solution for offshore wind power steel piles, particularly splash areas and water change areas, effectively guaranteeing the structural safety and reducing the maintenance cost of the whole life cycle.

Inventors

  • SUN QI
  • LI WEI
  • CHEN SHENGGUANG
  • LOU ZHENGJI
  • XU BOWEI
  • ZHANG XINGYU

Assignees

  • 西安热工研究院有限公司

Dates

Publication Date
20260512
Application Date
20260414

Claims (10)

  1. 1. The construction method of the anti-corrosion coating of the offshore wind power pile foundation steel pile is characterized by comprising the following steps of: S1, prefabricating a flexible composite sheet, wherein the structure of the prefabricated flexible composite sheet sequentially comprises an adhesive layer formed by an adhesive, a base material layer formed by a fiber composite material and a protective layer formed by a composite material containing fluorocarbon resin, and the three layers are formed by a hot-pressing composite process; S2, cleaning the surface to be protected of the offshore wind power foundation steel pile, conveying the flexible composite sheet provided in the step S1, cutting, exposing the adhesive layer, and directly adhering the adhesive layer to the surface to be protected; and S3, rolling the outer surface of the adhered flexible composite sheet to enable the flexible composite sheet to be fully attached to the surface of the steel pile.
  2. 2. The method according to claim 1, wherein in step S1, the adhesive is a two-component adhesive, the a component of which contains a side-chain fluorine-containing polyurethane prepolymer, and the B component of which contains a cycloaliphatic amine curing agent.
  3. 3. The method according to claim 1, wherein in step S1, the substrate layer is a core-sheath structure, the core layer is a carbon fiber bundle treated with plasma, and the sheath layer comprises a thermoplastic polyurethane elastomer.
  4. 4. The construction method according to claim 1, wherein step S1 comprises uniformly coating an adhesive on one side of a base material layer to form an adhesive layer, uniformly coating a composite material on the other side to form a protective layer after pre-curing, compositing the three-layer structure by a gradient hot roller, and quenching to form the flexible composite sheet.
  5. 5. The construction method according to claim 4, wherein the pre-curing is performed in a hot air circulation environment with a wind speed of 1-3 m/s and a temperature of 60-80 ℃ for 4-8 min, so that the solvent residue rate of the coating is lower than 5%, and the gel rate is 20% -50%.
  6. 6. The construction method according to claim 5, wherein the gradient hot roll compounding process sequentially comprises: A first section, namely pre-pressing for 4-8 min at 80-100 ℃ and under 0.5-2 MPa; A second stage of compacting treatment for 8-12 min at 130-150 ℃ and 5-8 MPa; and a third step of final compounding for 10-15 min at 160-190 ℃ and 10-15 MPa.
  7. 7. The method of claim 6, wherein the quenching is performed using a three-stage gradient cooling: the first stage, cooling from 160-190 ℃ to 90-100 ℃ with the cooling rate of 30-50 ℃ per second; the second stage, namely cooling from 90-100 ℃ to 60-70 ℃ with the cooling rate of 15-30 ℃ per second; and in the third stage, cooling from 60-70 ℃ to below 40 ℃ at a cooling rate of less than 5 ℃ per second.
  8. 8. The construction method according to claim 1, wherein in the step S2, when the curved surface and the weld joint are adhered, the flexible composite sheet is heated in an auxiliary manner by using a heat gun, the temperature of the auxiliary heating is controlled to be 100-120 ℃, the distance between the gun head of the heat gun and the flexible composite sheet is 10-20 cm, and the heat gun head and the flexible composite sheet are uniformly heated in a circular movement manner at a speed of 60-80 mm/S.
  9. 9. The construction method according to claim 8, wherein the cut size of the flexible composite sheet is 3 to 10mm wider than the single side of the area to be protected of the steel pile.
  10. 10. The construction method according to claim 1, wherein the step S3 of applying pressure by using a mechanical gradient rolling pressure maintaining method comprises the following steps: applying a pressure of 0.2-0.5 MPa by adopting a flexible press roller with the Shore A hardness of 50-60, and performing spiral line type rolling for 1-2 times from the center to the edge of the flexible composite sheet; applying a pressure of 0.8-1.5 MPa by adopting a rigid metal roller with the Shore A hardness of 80-90, and carrying out repeated overlapping rolling for 2-3 times at a speed of 0.3-0.8 m/s along a single direction; a constant-temperature heating steel roller with the Shore A hardness of 120-150 and the temperature of 60-80 ℃ is adopted, the pressure of 1.0-2.0 MPa is applied, and the final slow rolling is carried out for 2-3 times; And maintaining the pressure for 15-30 min under the pressure of 0.1-0.3 MPa, and stopping the pressure maintaining when the edge of the bonding layer forms uniform and continuous micro adhesive tapes and is naturally solidified to form edge sealing, so as to finish the mechanical gradient rolling pressure maintaining process.

Description

Construction method of anti-corrosion coating of offshore wind power pile foundation steel pile Technical Field The invention relates to the technical field of corrosion prevention of wind power equipment, in particular to a construction method of a corrosion prevention coating of a foundation steel pile of an offshore wind power pile. Background Offshore wind power is developing towards large-scale and deep open sea as an important component of clean energy. The offshore wind power foundation steel pile supporting the whole fan structure is in an extremely severe marine corrosion environment for a long time, and the corrosion resistance of the offshore wind power foundation steel pile is directly related to structural safety, operation cost and service life. The most severe corrosion challenges are faced with offshore wind foundation steel piles, particularly in splash zones and water level fluctuation zones. The area is not only in high humidity and high salt fog environment for a long time, but also has extremely high chloride ion concentration and easy enrichment due to the factors of sea wave impact, dry-wet alternation, sunlight exposure and the like, and forms strong infiltration corrosion on a steel structure. At present, the corrosion of the offshore wind power foundation steel pile is mainly achieved by a mode that a surface coating is formed by mechanically coating anti-corrosion paint, the coating is in a sea environment for a long time, corrosive media such as chloride ions are easy to permeate into a matrix through microscopic defects of the coating, corrosion of the coating is caused, the coating is caused to bubble and peel, finally, protection is invalid, and the existing mechanical coating is short in protection life and poor in corrosion prevention effect. In summary, the existing corrosion prevention technology for offshore wind power steel piles faces the double challenges of extremely severe external environment and inherent defects of internal technology. Environmental factors require that the protective system must have ultra-strong corrosion resistance, permeation resistance and long service life, and the defects of the prior art lead to unstable protective layer quality, poor reliability and high safety cost. Disclosure of Invention According to a first aspect of the present disclosure, there is provided a method for constructing an anti-corrosion coating of a foundation steel pile of an offshore wind power pile, comprising the steps of: S1, prefabricating a flexible composite sheet, wherein the structure of the prefabricated flexible composite sheet sequentially comprises an adhesive layer formed by an adhesive, a base material layer formed by a fiber composite material and a protective layer formed by a composite material containing fluorocarbon resin, and the three layers are formed by a hot-pressing composite process; S2, cleaning the surface to be protected of the offshore wind power foundation steel pile, conveying the flexible composite sheet provided in the step S1, cutting, exposing the adhesive layer, and directly adhering the adhesive layer to the surface to be protected; and S3, rolling the outer surface of the adhered flexible composite sheet to enable the flexible composite sheet to be fully attached to the surface of the steel pile. With reference to the first aspect, in step S1, the adhesive is a two-component adhesive, the a component of which comprises a side-chain fluorine-containing polyurethane prepolymer, and the B component of which comprises a cycloaliphatic amine curing agent. With reference to the first aspect, in step S1, the substrate layer is a core-sheath structure, the core layer is a carbon fiber bundle treated by plasma, and the sheath layer includes a thermoplastic polyurethane elastomer. In combination with the first aspect, the step S1 specifically comprises the steps of uniformly coating an adhesive on one side of a substrate layer to form an adhesive layer, uniformly coating a composite material on the other side of the substrate layer to form a protective layer after pre-curing, compositing the three-layer structure through a gradient hot roller, and quenching to form the flexible composite sheet. In combination with the first aspect, the pre-curing is performed in a hot air circulation environment with the air speed of 1-3 m/s and the temperature of 60-80 ℃ for 4-8 min, so that the solvent residue rate of the coating is lower than 5%, and the gel rate is 20% -50%. With reference to the first aspect, the gradient hot roll compounding process sequentially includes: A first section, namely pre-pressing for 4-8 min at 80-100 ℃ and under 0.5-2 MPa; A second stage of compacting treatment for 8-12 min at 130-150 ℃ and 5-8 MPa; and a third step of final compounding for 10-15 min at 160-190 ℃ and 10-15 MPa. In combination with the first aspect, the quenching employs three-stage gradient cooling: the first stage, cooling from 160-190 ℃ to 90-100 ℃ with