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CN-122011901-A - Ocean facility anti-corrosion protection layer regulation and control method suitable for strong salt fog environment

CN122011901ACN 122011901 ACN122011901 ACN 122011901ACN-122011901-A

Abstract

The embodiment of the invention relates to the technical field of heavy anti-corrosion coatings and discloses a marine facility anti-corrosion protection layer regulating and controlling method suitable for a strong salt spray environment, which comprises the steps of preparing self-activated intermediate paint and applying the self-activated intermediate paint between a primer and a finish paint to form a composite protection layer; the core is that the main agent of the self-activated intermediate paint contains a dual-triggering mineralizing precursor, the precursor consists of hydrophobic modified zeolite loaded by BF 4 ‑ and water glass particles coated by zinc phosphate, when a coating is damaged, a corrosion microenvironment of a damaged area can cooperatively trigger the zeolite to release BF 4 ‑ to buffer pH, simultaneously trigger the coated water glass particles to dissolve and release silicate ions, and the released silicate ions react with cations in the environment in situ to generate mineralized products to seal the damaged area. The invention can actively inhibit corrosion expansion and cathode stripping after the coating is damaged, and remarkably improves the long-term reliability and service life of the protective layer.

Inventors

  • LI WEI
  • SUN QI
  • 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 marine facility anti-corrosion protection layer regulation and control method suitable for the strong salt spray environment is characterized by comprising the following steps of: (1) Preparing self-activated intermediate paint, wherein the self-activated intermediate paint consists of a main agent and a curing agent; The main agent comprises the following components in percentage by mass: 30% -40% of bisphenol A epoxy resin; 5% -12% of dual-triggering mineralized precursor; 30% -35% of pigment and filler; 10% -15% of an organic solvent; 1% -3% of an auxiliary agent; Wherein the dual trigger mineralization precursor is a composite additive consisting of BF 4 - loaded hydrophobic modified zeolite and zinc phosphate coated water glass particles; (2) And (3) applying an anti-corrosion protective layer, namely sequentially applying a primer, a self-activated intermediate paint obtained by mixing the main agent obtained in the step (1) with a curing agent and a finish paint on the surface-treated substrate, and curing.
  2. 2. The method for regulating and controlling the corrosion protection layer of the marine facility in the strong salt spray environment according to claim 1, wherein the mass ratio of the hydrophobic modified zeolite loaded by BF 4 - to the water glass particles coated by zinc phosphate in the dual-trigger mineralization precursor is (1.5-2) 1.
  3. 3. The method for regulating and controlling the corrosion protection layer of the marine facility in a strong salt spray environment according to claim 1, wherein the zeolite in the hydrophobically modified zeolite loaded by BF 4 - is Y-type molecular sieve zeolite or ZSM-5-type molecular sieve zeolite.
  4. 4. A method for regulating and controlling an anti-corrosion protective layer of a marine facility adapted to a strong salt spray environment according to any one of claims 1 to 3, wherein the hydrophobically modified zeolite loaded by BF 4 - is hydrophobically modified by gamma- (2, 3-glycidoxy) propyl trimethoxysilane.
  5. 5. The method for regulating and controlling the corrosion-resistant protective layer of the marine facility suitable for the strong salt spray environment according to any one of claims 1 to 3, wherein the water glass particles in the water glass particles coated with the zinc phosphate are prepared by spray drying sodium silicate aqueous solution with the modulus of 3.1-3.4.
  6. 6. The method for regulating and controlling the corrosion protection layer of the marine facility suitable for the strong salt spray environment according to any one of claims 1 to 3, wherein in the preparation step of the zinc phosphate coated sodium silicate particles, the pH value of a zinc phosphate coating reaction system is controlled to be 5.8-6.2.
  7. 7. A method for regulating and controlling an anti-corrosion protective layer of a marine facility adapted to a strong salt spray environment according to any one of claims 1 to 3, wherein the curing agent is a cardanol modified amine curing agent.
  8. 8. The method for regulating and controlling the anti-corrosion protection layer of the marine facility, which is suitable for the strong salt spray environment, according to claim 7, wherein the mass ratio of the main agent to the cardanol modified amine curing agent is (4-5): 1.
  9. 9. A method for regulating and controlling an anti-corrosion protective layer of a marine facility adapted to a strong salt spray environment according to any one of claims 1 to 3, wherein the primer is an epoxy zinc-rich primer and the finish is a polyurethane finish.
  10. 10. The method for regulating and controlling the anti-corrosion protective layer of the marine facility, which is suitable for the strong salt spray environment, according to any one of claims 1 to 3, wherein the thickness of a dry film formed by curing the self-activated intermediate paint is 140-220 μm.

Description

Ocean facility anti-corrosion protection layer regulation and control method suitable for strong salt fog environment Technical Field The embodiment of the invention relates to the technical field of heavy anti-corrosion coatings, in particular to a marine facility anti-corrosion protection layer regulating and controlling method suitable for a strong salt spray environment. Background Offshore wind power is used as an important clean energy source, and key supporting structures such as jackets are used in severe marine environments with high salt, high humidity, strong ultraviolet rays and sea wave scouring for a long time, and steel structural substrates face extremely serious corrosion threats. At present, a long-acting heavy-duty coating system is a main technical means for guaranteeing the safety and durability of the key infrastructure. The existing anti-corrosion coating technology mainly depends on the physical shielding effect of the coating, and a compact and low-permeability isolating film is formed to isolate the metal substrate from external corrosive media (such as water, oxygen, chloride ions and the like). However, during the manufacturing, transportation, installation and long-term service of the equipment, the coating inevitably generates mechanical damages such as scratches, cracks and the like due to factors such as collision, scraping and the like. Such passive physical protective barriers fail once the coating develops penetration defects. The exposed metal substrate can rapidly form a corrosion microcell in a salt spray environment, so that rapid electrochemical corrosion can occur at the defect, and more serious, the corrosion can spread all around along the interface between the coating and the substrate. Meanwhile, in the cathode region at the edge of the defect, a large amount of hydroxyl ions can be generated and enriched by oxygen reduction reaction to form a local high-alkalinity micro-environment, and the high-pH environment can destroy chemical bonding or physical adhesive force between coating resin and a substrate, so that serious cathode stripping phenomenon is caused, a large-area coating is dropped, and finally the whole protection system is disabled. Therefore, when facing mechanical damage, the traditional anti-corrosion coating lacks active response and self-repairing capability, cannot effectively inhibit corrosion initiation and expansion of damage points, and has serious limitation on the reliability of long-term protection. Disclosure of Invention The embodiment of the invention aims at least solving one of the technical problems in the prior art and provides a marine facility anti-corrosion protection layer regulating and controlling method suitable for a strong salt spray environment. The embodiment of the invention provides a marine facility anti-corrosion protection layer regulation and control method suitable for a strong salt spray environment, which comprises the following steps: (1) Preparing self-activated intermediate paint, wherein the self-activated intermediate paint consists of a main agent and a curing agent; The main agent comprises the following components in percentage by mass: 30% -40% of bisphenol A epoxy resin; 5% -12% of dual-triggering mineralized precursor; 30% -35% of pigment and filler; 10% -15% of an organic solvent; 1% -3% of an auxiliary agent; Wherein the dual trigger mineralization precursor is a composite additive consisting of BF 4- loaded hydrophobic modified zeolite and zinc phosphate coated water glass particles; (2) And (3) applying an anti-corrosion protective layer, namely sequentially applying a primer, a self-activated intermediate paint obtained by mixing the main agent obtained in the step (1) with a curing agent and a finish paint on the surface-treated substrate, and curing. By adopting the technical scheme, the invention constructs a synergistic self-repairing system which can be activated by the characteristic environment (high pH and high Cl -) of the corrosion micro-area after the coating is damaged. Due to the adoption of the dual trigger mineralization precursor composed of the hydrophobic modified zeolite loaded by BF 4- and the water glass particles coated by zinc phosphate, when the coating is scratched, the system can realize active protection and repair of the damaged area. The specific action mechanism is as follows: When the coating breaks down, the metal substrate is exposed to an oxygen-containing electrolyte (seawater or salt spray) and a corrosive microcell is rapidly formed. In the anode region (substrate exposed), a metal dissolution reaction (Fe→Fe 2++2e-) occurs, and in the cathode region (coating/substrate interface at the scratch edge), an oxygen reduction reaction (O 2+2H2O+4e-→4OH-) occurs. This results in the simultaneous appearance of two key environmental features, OH - enrichment due to cathodic reaction, forming a local high pH environment, and high concentration of Cl - due to seawater. Th