Comparison of the advantages of copper wire and aluminum wire and the reasons why they cannot be connected together

Same area

Copper Wire is more loaded than Aluminum Wire.

Copper wire is more flexible than aluminum wire.

Copper wire has a lower resistivity than aluminum wire.

Copper wire is more stable than aluminum wire.

However, the copper wire is about 3.5 times the price of the aluminum wire!

If some friends, first use aluminum wire, then buy copper wire

So can copper wire and aluminum be connected directly?

Answer: No

(copper aluminum wire connector)

The chemical and physical properties of copper and aluminum are very large and should not be directly connected.

When connection is required, copper-aluminum transition clamps, copper-aluminum transition joints, copper wire tin-silica or aluminum wire tin-tin are generally used for direct connection.

Because the copper and aluminum metals have different electrochemical properties.

Once an electrolyte is formed in contact with water, carbon dioxide and other impurities, a chemical battery is formed.

This is because aluminum tends to lose electrons and become a negative electrode. It is difficult for copper to lose electrons to become a positive electrode. Thus, an electromotive force of 1.69V is formed between the positive and negative electrodes, and a small current is passed through to corrode the aluminum wire, so-called electrification. corrosion.

This will cause poor contact between copper and aluminum and increase the contact resistance.

When there is current, it will increase the temperature of the joint, and the temperature will increase and accelerate the corrosion of the joint, increasing the contact resistance, causing a vicious cycle until it burns and even causes a fire.