Ship Due to good seawater corrosion resistance, many co […]
Due to good seawater corrosion resistance, many copper alloys such as aluminum bronze, manganese bronze, aluminum brass, gunmetal (tin-zinc bronze), white steel and nickel-copper alloy (monel) have become the standard materials for shipbuilding. Generally, copper and copper alloys account for 2 to 3% of the weight of warships and merchant ships.
The propellers of warships and most large merchant ships are made of aluminum bronze or brass. The propeller of the big ship weighs 20 to 25 tons each. The propellers of the Queen Elizabeth and Queen Mary are each weighing 35 tons. The heavy tail shaft of the ship is often used with the same material as the "admiral" "gunmetal, rudder and propeller tapered bolts. Steel and copper alloys are also used extensively in the engine and boiler room. The world's first nuclear-powered merchant ship used 30 tons of white copper condenser tubes. A large heating coil with an aluminum brass tube as the oil tank has 12 such oil storage tanks on a 100,000-ton ship, and the corresponding heating system is quite large. The electrical equipment on board is also very complex, and the engine, electric motor, communication system, etc. rely almost entirely on copper and copper alloys to work. Steel and copper alloys are often used in the cabins of large and small vessels. Even wooden boats, it is best to use a steel alloy (usually silicon bronze) screws and nails to fix the wood structure, which can be produced in large quantities by rolling.
In order to prevent the hull from being affected by the pollution of marine organisms, it is often protected by coated copper; or it can be solved by brushing with copper paint.
In the Second World War, in order to defend against the German magnetic mines attack on ships, a magnetic anti-mineral device was developed. A copper band was attached around the steel hull, and current was applied to neutralize the ship's magnetic field. Do not detonate mines. Since 1944, all of the Allied ships, totaling approximately 18,000, have been protected by the demagnetization device. Some large main ships need a lot of copper for this purpose, for example, one of them uses a copper wire that is 28 miles long and weighs about 30 tons.