Alumnum

8 Pages 2044 Words

alloys even lighter, the lightest metal, lithium, is added to aluminum. Products packed in aluminum cost less to ship because the containers weigh less than those made with other metals. The same is true with ground vehicles. The engine block, the drive shafts, the radiator, the wheels and the body panels can all be made of aluminum alloys. The car thus weighs less, and, again, the fuel consumption improves. Unfortunately, the price also increases, which is why cars and trucks today are still made of mostly steel. (Advantages to Aluminum) Although pure aluminum is weak, certain aluminum alloys are as strong as steel. Such alloys are used in airplanes and trucks, in guard rails along highways, and in other products that require strength. Aluminum alloys loose some strength at high temperatures. Unlike many other metals, however, they get stronger at extremely low temperatures. Aluminum alloys are widely used in equipment for processing, transporting and storing liquified natural gas, which can have a temperature of -260? F. (Walker, 36) Some metals wear away if exposed to oxygen, water, or various chemicals. When exposed to them a chemical reaction causes most metals to rust or become discolored. When aluminum reacts with oxygen, however, the metal forms an invisible layer of a chemical compound called aluminum oxide. This layer protects aluminum from corrosion by oxygen, water and many chemicals. It makes aluminum especially valuable for use outdoors where the metal is exposed to, and must resist, the effects of wind, rain and pollution. (Knapp, 9) Aluminum is a good conductor of electricity. Aluminum and copper are the only common metals suitable for use as...