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Why can't the copper and aluminum wires be connected together?

  • Author:chipstores
  • Source:chipstores.com
  • Release on :2018-04-10
Briefly introduce the advantages and disadvantages of copper wire and aluminum wire: The same area of ​​copper wire is more loaded than aluminum wire. Copper wire is more flexible than aluminum wire. Copper wire has lower resistivity than aluminum wire. Copper wire has better stability than aluminum wire. However, the copper wire is about 3.5 times the price of aluminum wire!

Therefore, some people will choose to use aluminum wire to save money, but Xiao Bian still strongly recommends copper wire. This money cannot be saved! If some people first use aluminum wire and later buy the copper wire, can the copper wire and aluminum be connected directly?
Answer: No. Why can't the copper and aluminum wires be connected together?

The chemical and physical properties of copper and aluminum are very different and should not be directly connected. However, the copper-aluminum connection is inevitable. When the connection is required, a copper-aluminum transitional wire clip, a copper-aluminum transitional adapter, a copper wire or a tin wire or an aluminum wire are directly connected.

Because the electrochemical properties of copper and aluminum are different. If they are directly connected, a chemical battery is formed when water, carbon dioxide, and other impurities form an electrolyte.

This is because aluminum tends to lose electrons to become negative electrodes, and it is difficult for copper to lose electrons to become positive electrodes, so that a 1.69 V electromotive force is formed between the positive and negative electrodes, and a very small current is passed through to erode aluminum wires, so-called electrification. corrosion. This will cause poor contact between copper and aluminum, increasing contact resistance.

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

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