Copper is a metal found in the earth's crust and in the oceans. The content of copper in the earth's crust is about 0.01%, and in individual copper deposits it can reach 3% to 5%. Most of the copper in nature exists as compounds, i.e. copper ores.
1. Electrical and thermal conductivity: copper's electrical and thermal conductivity is second only to silver, ranked second. And the price is much lower than gold and silver. Pure copper can be drawn into very fine copper wire, made of very thin copper foil.
2. Corrosion resistance: generally speaking, the corrosion resistance of copper is lower than gold, platinum, silver and titanium, and gold, platinum, silver is a precious metal, the actual application scale is very small; compared to iron, zinc, magnesium and other metals, copper corrosion resistance is very strong. Compared with aluminum, copper is more resistant to non-oxidizing acids, alkalis and seawater corrosion, but in the atmosphere, weak acids and other media, aluminum corrosion resistance is stronger than copper.
3. Easy processing and forming: copper's strength is moderate (200 ~ 360MPa), deformation resistance is greater than aluminum and much smaller than steel and titanium. Copper plasticity is very good, can withstand large deformation of hot and cold pressure processing, such as rolling, extrusion, forging, stretching, stamping, bending, etc., rolling and stretching of the degree of deformation up to 95% or more without having to carry out the intermediate annealing and other heat treatment.
4. Color: pure copper is simple and elegant purple (also known as bronze), copper alloy has a variety of beautiful color, such as golden yellow (H65 brass), silver (white copper, zinc white copper), cyan (aluminum bronze, tin bronze), or gorgeous, or dignified, very popular.
5. Bacteria inhibition: copper can inhibit the growth of bacteria and other microorganisms, 99% of the bacteria in the water in the copper environment 5h will all be killed. This is very important for the transmission of drinking water, food utensils, marine engineering.
6. Weldability: copper is easy to soft brazing, hard brazing, gas shielded arc welding and other methods of welding, containing a small amount of phosphorus phosphorus deoxygenation of copper weldability is better. Due to the good thermal conductivity of copper, so copper welding requires high-power, high-energy beam welding facilities, preferably gas-shielded, generally not recommended spot welding.
7. Platability: copper platability is very good, can be plated with high melting point metals such as nickel, chromium, etc., can also be heat-plated low melting point metals such as tin, zinc and so on.
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