Method for preparing metallic antifouling coating of ship sea chest

An anti-fouling coating and submarine door technology, which is applied in the direction of anti-fouling/underwater coatings, coatings, and devices for coating liquid on the surface, can solve fouling, fail to achieve effective anti-fouling, and increase surface frictional resistance and other problems, to achieve the effect of simple preparation process, long antifouling period and good safety

Inactive Publication Date: 2011-10-26
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

After the ship adheres to marine organisms, it will significantly increase surface friction resistance, reduce ship speed, increase fuel consumption and docking maintenance times, and foul the ship's seawater system and valves, resulting in reduced flow rate and even blockage. These hazards shorten the service life of the ship itself. At the same time It also seriously reduces the efficiency of the shipping company and the combat effectiveness of the ship. If the underwater operators want to remove the attached sea organisms, it needs to be removed about three times a year.
However, sometimes ships are forced to set sail due to unexpected factors such as typhoons, so that underwater operations that take a long time cannot be completed in time, and people expect simple and effective methods to control the adhesion of marine organisms
[0003] At present, the commonly used method to prevent marine biofouling is to apply antifouling coatings, but the existing antifouling coatings have many defects, such as the short antifouling period and unsatisfactory paint film strength. Due to

Method used

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  • Method for preparing metallic antifouling coating of ship sea chest

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Embodiment 1

[0012] The coating in this embodiment is a metal composite coating prepared by a spraying process. The composite coating contains an antifouling agent that can inhibit marine organisms. According to the different requirements of the substrate and protection life, the composition of the coating can be changed. content; first, degreasing, sandblasting and dust pretreatment are carried out on the substrate of the ship's submarine door, and then the copper powder or copper alloy with a particle size of 5-50 μm and cuprous oxide powder or zinc oxide powder are mixed evenly into powder and placed in the In the cold spraying equipment, use nitrogen, helium or air to carry the powder on the substrate at a spraying speed of 10cm-20cm / min and a pressure of 0.7-3.5MPa and control the temperature of the main gas at 300-550°C. A metal composite coating with a thickness of 100-300 microns is formed in one pass, the mass percentage of copper in the coating is 70-95%, and the mass percentage o...

Embodiment 2

[0019] Embodiment 2: According to the process steps of Embodiment 1, select the substrate of the sea bottom door of a ship, adjust the mass percentages of copper and zinc oxide in the coating to 70% and 30%, and prepare a coating with a coating thickness of 100 microns.

Embodiment 3

[0020] Embodiment 3: According to the process steps of Embodiment 1, select the base body of the ship's seabed door, adjust the mass percentages of copper or copper-nickel or copper-aluminum alloy and zinc oxide in the coating to 95% and 5%, and prepare the coating. The thickness of the prepared coating is 300 microns, and the mass percentage of copper in the copper-nickel or copper-aluminum alloy powder is 95%-99%.

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Abstract

The invention belongs to the technical field of marine corrosion and fouling prevention and relates to a method for preparing a metallic antifouling coating of a ship sea chest. The method comprises the following steps: firstly, pretreating a ship sea chest or sea grating substrate, wherein the pretreatment comprises oil removing, sand blasting and dust removing; and then preparing mixed powder by uniformly mixing copper powder or copper alloy powder and cuprous oxide powder or zinc oxide powder and placing the mixed powder in a cold spraying device; and lastly, twice spraying the mixed powder carried by nitrogen, helium or air onto the ship sea chest or sea grating substrate twice under the condition of controlling the temperature of a main gas to finally a metallic compound coating which is characterized by high bonding force and long antifouling period. The preparation process is simple. The thickness of the coating and the active antifouling components are controllable. The manual maintenance is unnecessary and no hole is drilled on a ship shell. The sailing safety of the ship is high. The coating has excellent density and high hardness and bonding force.

Description

Technical field: [0001] The invention belongs to the technical field of marine anti-corrosion and anti-fouling, and relates to a method for preparing a metal anti-fouling coating for a ship's seabed door, which is suitable for the anti-fouling and anti-corrosion long-term metal composite coating for the seabed door at the bottom of the ship body and the seabed grille Layer coating occasions. Background technique: [0002] The seabed door of existing ship body is also called seawater door or seawater suction box, and its effect is exactly to supply the suction place of whole ship seawater, and seabed door has the branch of high seabed door, low seabed door, emergency seabed door. When the ship is navigating in the port or in shallow water, the high seabed door is used to avoid inhalation of sand and sand. When the ship is sailing in the ocean or light-loaded, the low seabed door is used to prevent the air from being sucked in when the ship is swaying. The size of the capacit...

Claims

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Application Information

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IPC IPC(8): B05D7/14B05D3/00C09D1/00C09D5/16
Inventor 李相波许立坤黄国胜
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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