Mengapa wayar tembaga dan aluminium tidak boleh disambungkan bersama?

Jadi tembaga dan aluminium tidak boleh disambungkan secara langsung. Jika sambungan kuprum-aluminium tidak dapat dielakkan, copper-aluminum transition clips or copper-aluminum transition joints are required.

The electrochemical properties of copper and aluminum are different

If they are directly connected, apabila mereka bertemu dengan elektrolit yang dibentuk oleh air, karbon dioksida dan kekotoran lain, bateri kimia akan terbentuk. This is because aluminum is easy to lose electrons to become a negative electrode, and copper is difficult to lose electrons to become a positive electrode. An electromotive force of 1.69V is formed between, and a small current passes through, which corrodes the aluminum wire, which is the so-called galvanic corrosion. This will cause poor contact between copper and aluminum and increase the contact resistance. When a current passes through, the temperature of the joint will increase, which will further accelerate the corrosion of the joint, increase the contact resistance, and cause a vicious circle until it burns out.

Mengapa wayar tembaga dan aluminium tidak boleh disambungkan bersama?

Mengapa wayar tembaga dan aluminium tidak boleh disambungkan bersama?

The electrochemical properties of copper and aluminum are different

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