Copper Clad Aluminum is aluminum wire as the main body, coated with a certain portion of the outer layer of copper wire, can be used as coaxial cable conductor and electrical equipment wire and cable conductor. Because the main function of this kind of wire is to transmit the signal, it flows the electric current is very small. Especially high-frequency signal transmission is completely run in the outer conductor, so copper clad aluminum wire can replace the same specifications of copper. Compared with the pure copper wire, copper clad aluminum wire has obvious advantages: First, light weight, easy to transport and install the construction, can reduce labor costs; the second is obvious economic benefits, at the same time, as the pure copper clad with aluminum Core separation is almost impossible, but also receive additional anti-theft effect. However, due to the inherent prejudice of copper clad aluminum wire, there are still more disadvantages than copper wire which restrict its development and promotion. How to prevent corrosion of copper clad aluminum has become the key to its popularization and application. Copper and aluminum in copper clad aluminum wire are two kinds of metal with different electrode potentials. When copper and aluminum are exposed to the atmosphere on its end surface, if the humidity in the atmosphere is large, the end surface will accumulate water molecules in the air Small drops of water combine with sulfur dioxide (SO2) in the air to form a corrosive solution of sulfuric acid (H2SO4). In this way, a corrosive cell consisting of anodes, cathodes, electrolyte solutions and electronic circuits is created. Corrosion of the battery is caused by the destruction of metal materials without doing useful work outside the short circuit of the original battery, in this corrosive cell, because the aluminum electrode potential is low and corroded. In order to avoid the electrochemical corrosion of the copper clad aluminum wire end the best way is to block the end with the atmosphere, at present, there are two ways to solve this problem: 1, electroplating method: copper clad aluminum butt joints plated copper, but too time-consuming (40 minutes). However, the use of copper clad aluminum wire production company is not a problem, because many joints can be plated together. The difficulty is that the appearance of aluminum copper is very difficult. 2, painted copper quick-drying paint: dry solid within two minutes, the color and copper appropriate. This is about the use of copper clad aluminum wire user is very convenient. Because the user can cut the wiring in any part, just quickly dry paint in the cross-section, you can avoid corrosion. At present, copper clad aluminum wire has been widely used in the cable television industry, copper clad aluminum wire in the United States has become a standard material for coaxial cable. It is a replacement of copper wire products, with the rational use of natural resources, reduce production costs, ease of construction and so on. In China, with the gradual understanding and correct understanding of copper clad aluminum wire, the development prospects of copper clad aluminum wire will be very broad.