Copper clad aluminum wire has obvious advantages, and corrosion prevention is the key

Author：hlyb Add Time：2016-05-26 08:27:30

Copper clad aluminum wire is a wire with aluminum core wire as the main body and coated with a certain share of copper layer. It can be used as conductor for coaxial cable and wire and cable conductor in electrical equipment. Because the main function of this kind of wire is to transmit signals, the current flowing through it is very small. In particular, high-frequency signal transmission runs completely on the outer layer of the conductor, so copper-clad aluminum wire can replace copper wire of the same specification.

Compared with pure copper conductor, copper-clad aluminum conductor has obvious advantages: first, it is light in weight, convenient for transportation, installation and construction, and can reduce labor cost; Second, it has obvious economic benefits. At the same time, because the separation of pure copper coating and aluminum core wire is almost impossible, it can also receive additional anti-theft effect.

However, in addition to people's inherent prejudice against copper-clad aluminum wire, copper-clad aluminum wire is more prone to corrosion than copper wire, which restricts its development and popularization. How to prevent copper clad aluminum wire from being corroded has become the key to its popularization and application.

Copper and aluminum in copper clad aluminum wire are two metals with different electrode potentials. When copper and aluminum are exposed in the atmosphere on its end face, if the humidity in the atmosphere is large, the end face will absorb water molecules in the air and accumulate into small water droplets. The water droplets will combine with sulfur dioxide (SO2) in the air to form corrosive solution sulfuric acid (H2SO4). In this way, the anode, cathode A corrosive battery consisting of an electrolyte solution and an electronic circuit is produced. Corrosive battery is a short-circuit primary battery that causes damage to metal materials without doing useful work to the outside world. In this corrosive battery, aluminum is corroded because of its low electrode potential.

In order to avoid electrochemical corrosion at the end of copper-clad aluminum wire * * * the best way is to block the end from the atmosphere. At present, there are two main ways to solve this problem:

1. Electroplating method: plating a layer of copper at the butt joint of copper-clad aluminum wire, but it takes too much time (40 minutes). However, it has little problem in the company producing copper-clad aluminum wire, because many joints can be electroplated together. The difficulty is that copper plating on the surface of aluminum is very difficult.

2. Apply copper quick drying paint: dry and firm within two minutes, and the color is appropriate to copper. This is very convenient for users using copper clad aluminum wire. Because the user can cut the wiring at any part, as long as the quick drying paint is applied on the section immediately, the corrosion can be avoided.

At present, copper clad aluminum wire has been widely used in cable TV industry. In the United States, copper clad aluminum wire has become the standard material of coaxial cable. It is an updated product of copper conductor, which has the advantages of rational utilization of natural resources, reducing production cost and facilitating engineering construction. In China, with the gradual understanding and correct understanding of copper clad aluminum wire, the development prospect of copper clad aluminum wire will be very broad.

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Copper clad aluminum wire has obvious advantages, and corrosion prevention is the key