Copper and copper alloys are one of the major commercial metal groups. They have a wide range of properties, including excellent electrical and thermal conductivity, outstanding corrosion resistance, good strength and fatigue resistance, and appearance. They are easy to work with, braze and solder.
Key selection criteria include:
Electrical conductivity: Copper has the highest electrical conductivity of any engineering metal. Silver or other elements can be added to increase strength, resistance to softening or other properties without serious loss of conductivity.
Thermal conductivity: This property is similar to electrical conductivity. Copper alloys can be used to achieve this property, where good corrosion resistance is compensated for by increased alloying.
Colour and Appearance: Many copper alloys have a distinctive colour which may change as the object is weathered. For most alloys it is easy to prepare and maintain a high standard of finish even under unfavourable corrosive conditions. Many alloys are used for decorative applications in their original form or after metal plating. These alloys have specific colours ranging from the salmon pink of copper through yellow, gold and green to dark bronze under weathering conditions. Exposure to the atmosphere produces a green or bronze coloured finish and pre-plated copper alloys are available in some product forms.
Ease of Manufacturing: Most alloys can be easily cast, hot or cold formed, machined, and joined. These alloys are often the standard against which other metals are compared.
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