Method for preparing metallic antifouling coating of ship sea chest

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...

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 the high flow rate of seawater, the organic antifouling coating is easy to peel off, and the currently commonly used antifouling coatings cannot achieve the antifouling effect

Chinese patent marine anti-fouling and anti-corrosion device electrode installation structure (200420119041.4) introduces a structural design and installation method for electrolytic anti-fouling electrodes for marine submarine valve boxes to increase the convenience of electrode replacement, but this electrolytic anti-fouling The method is mainly used for anti-corrosion and anti-fouling of seawater pipelines in ships. For submarine doors and grilles, because they are located at the water inlet end, anti-sea biological ions cannot reach, so they basically cannot achieve the purpose of effective anti-fouling

Therefore, many ships have given up applying anti-fouling coatings to the submarine doors and grilles. Most of the ships’ submarine doors and grilles are currently in an unprotected state, and the problem of fouling is particularly serious. It will block the grille and affect the operation of the ship

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