لماذا لا يمكن توصيل أسلاك النحاس والألمنيوم معًا?

لذلك لا ينبغي توصيل النحاس والألمنيوم مباشرة. إذا كان اتصال النحاس الألومنيوم أمر لا مفر منه, copper-aluminum transition clips or copper-aluminum transition joints are required.

If they are directly connected, بمجرد أن يلتقيوا بالكهرباء التي تشكلتها الماء, ثاني أكسيد الكربون وغيرها من الشوائب, سيتم تشكيل بطارية كيميائية. 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.