![]() ![]() After all, early watches were for the use of the powerful and wealthy only, so they were mostly made of precious gold or platinum. When oxidized, bronze develops a characteristic green "patina" and gradually forms a layer of copper oxide that protects the original material beneath it from corrosion while maintaining its characteristics.ĭespite its excellent metallic properties, bronze would patina when exposed to air for long periods of time, and these patches of lime green oxide were not very attractive, and bronze was relatively inexpensive, so it was rarely used for clocks. Bronze is antimagnetic, wear-resistant, and elastic, and is particularly resistant to corrosion by seawater (salt). In addition to tin bronze, aluminum bronze, lead bronze or phosphor bronze are also available. Bronze containing 10% tin is 4.7 times harder than pure copper. Pure copper is relatively soft, but when tin is added, it possesses many properties suitable for industrial manufacturing. In addition to bronze, alloys of copper include brass, white copper, and purple copper. The bronze made by our ancestors was an alloy of red copper (pure copper) and tin or lead, which was dark red, but became greenish-gray over time due to oxidation, hence the name bronze. Bronze is an alloy with a copper content of at least 60%. In archaeology, the stage of human cultural development marked by the use of bronze is called the "Bronze Age". As early as the fourth century B.C., man learned to cast bronze. Today, it is again one of the most popular materials for cases. However, bronze is still widely used in traditional fields and is also indispensable for some modern production techniques. With the development of steel smelting technology, it gradually became less important. Bronze, The first alloy invented in human history. ![]()
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