Jiangmen fishing boat building factory: what harm do marine attachments do to the ship
We know that the sea water has strong corrosivity to the ship, and the marine life has strong adhesion to the ship. After the ship is launched for a period of time, a lot of barnacles, algae and other marine organisms will be attached to the hull, and rust spots will appear. On the other hand, the presence of these warships increases the speed of the ship's flight and, on the other hand, increases the resistance of the ship's flight.
Marine attached organisms refer to the animals, plants and microorganisms that grow on the bottom of the ship and on the surface of the equipment in the sea. Microadhesions mainly include bacteria, diatoms, protozoa (unicellular animals), rotifers and nematodes.
The macrozoobenthos include Enteromorpha of Chlorophyta, also known as moss, lichen, etc.; Ulva lactuca also known as sea cabbage, seaweed, sea lettuce, green vegetable, lichen, etc.; porous animal sponge, coelenterate, Hydra, collective animal bryozoan, bivalve mollusk, crayfod, crustacean barnacle and invertebrate ascidian, etc.
Marine attached organisms do great harm to ships. They increase the weight of ships, the resistance of ships in flight, corrode ships and reduce the strength of ships. It can reduce the diameter of the cooling pipe of sea water and condensing pipe of heat exchanger, and even completely block up. It can promote the corrosion of ship plate and welding joint, and make the surface and machinery failure. Because of the absorption of sound energy by attached organisms, the acoustic instruments are ineffective or ineffective. Increase the area of buildings in the sea, and then increase the impact of waves and currents. Change the depth of floating body in water, such as mine, and plug the mesh.
The attachment of marine organisms is related to the current velocity. When the current velocity exceeds 1 knots, it is difficult for organisms to attach. Biological attachment is also related to ship data. Brass, copper and copper alloy containing more than 65% copper will not adhere to organisms.
In order to prevent biological adhesion, chemical coating on the surface of ship plate is generally used. Or special alloy data. For example, for Liaoning aircraft carrier, the alloy data ship plate itself can prevent biological adhesion. Moreover, the underwater robot should be used for cleaning in time.
Source: Jiangmen fishing boat construction factory http://www.unitedsteel.com.cn/