bronze
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Greek bronze helmet, mid 4th–mid 3rd century
BC
Image source: Wikipedia
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An alloy of copper
and no more than 30% tin, known since the 4th
millennium BC, and used then for tools and weapons,
now for machine parts and marine hardware. Statues are often cast in bronze.
It is a hard, strong alloy with good corrosion-resistance
(the patina formed in air is protective).
Various other components are added to bronze to improve hardness or machinability,
such as aluminum, iron,
lead, zinc, and
phosphorus. Aluminum bronzes, and some
others, contain no tin. Related category
• INORGANIC
CHEMISTRY
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