Duralumin is an alloy of aluminum with copper, with small amounts of magnesium and manganese. It contains about 4% copper, 0.5% - 1% magnesium and less than 1% manganese. The presence of copper provides it with strength. The alloy is also very lightweight and malleable. Due to these properties (light weight and high strength), it finds applications in aviation industry for manufacturing components of airplanes, especially by the military. The presence of copper makes it more susceptible to corrosion and it requires corrosion-resistant coating to protect itself. An easy anti-resistance coating is developed when duralumin is exposed to the environment, which results in the formation of a thin layer of aluminum oxide.
Duralumin was discovered a long time ago and has been in use for almost a century now.
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