brief introduction
Pure copper is purplish red, so it is also called red copper. It has excellent heat conduction and conductivity. Its conductivity is second only to silver, and it ranks second to metal. Copper has excellent chemical stability and corrosion resistance, and is an excellent electrical metal material.
classification
Copper alloys widely used in industry include brass, bronze and white copper.
The alloy of Cu and Zn is called brass, in which Cu accounts for 60%~90% and Zn accounts for 40%~10%. It has excellent thermal conductivity and corrosion resistance and can be used as parts of various instruments. Another example is to add a small amount of Sn into brass, which is called naval brass and has a good ability to resist seawater corrosion. A small amount of Pb with lubricating effect is added into brass, which can be used as sliding bearing material.
Bronze is the metal material with the longest history of human use. It is a Cu, Sn alloy. The addition of tin obviously improves the strength of copper, improves its plasticity, and enhances its corrosion resistance. Therefore, tin bronze is often used to manufacture wear-resistant parts and corrosion resistant accessories such as gears. Sn is more expensive, and a series of bronze alloys have been obtained by replacing Sn with Al, Si and Mn. The corrosion resistance of aluminum bronze is better than that of tin bronze. Beryllium bronze is the copper alloy with the highest strength. It is nonmagnetic and has excellent corrosion resistance. It is a spring material that can compete with steel.
As a Cu Ni alloy, white copper has excellent corrosion resistance and high resistance, so it can be used as a material for parts and resistors working under harsh corrosion conditions.
Brass contains zinc and a small amount of tin, lead, aluminum, etc.
