The copper clad Aluminum Enameled Wire is a wire mainly […]
The copper clad Aluminum Enameled Wire is a wire mainly composed of an aluminum core wire and plated with a certain amount of copper layer on the outside, and can be used as a conductor for a coaxial cable and a wire and cable conductor in an electric device. Because the main function of this type of wire is to transmit a signal, the current flowing through it is small. In particular, the high-frequency signal transmission is completely in the outer layer of the wire, so the copper-clad aluminum wire can replace the copper wire of the same specification.
Compared with pure copper wire, copper clad aluminum wire has obvious advantages: first, light weight, easy to transport and install construction, can reduce labor cost; second, it has obvious economic benefits, and at the same time, due to pure copper coating and aluminum Separation of the core wire is almost impossible and an additional anti-theft effect can be received. However, in addition to the inherent prejudice of copper-clad aluminum wire, there are also disadvantages that are more corrosive than copper wire, which restricts its development and promotion. How to prevent the copper clad aluminum wire from being corroded has become the key to its promotion and application.
Copper and aluminum in copper-clad aluminum wire are two kinds of metals with different electrode potentials. When copper and aluminum are exposed to the atmosphere on the end face, if the humidity in the atmosphere is large, the end face will adsorb water molecules in the air and accumulate. The fine water droplets, which combine with the sulfur dioxide in the air, form a corrosive solution of sulfuric acid, so that an etched battery composed of an anode, a cathode, an electrolyte solution and an electronic circuit is produced. A corroded battery is a short-circuit galvanic cell that causes destruction of a metal material without performing a useful work for the outside. In this etched battery, since the electrode potential of aluminum is low, it is corroded.