The corrosion resistance of CCA wire is mainly due to its outer copper coating. Copper itself has good corrosion resistance and is not easy to oxidize in the air. It can maintain its conductive properties for a long time even when exposed to humid or harsh environments. The copper coating provides a layer of protection for the internal aluminum core, thereby improving the corrosion resistance of the overall wire. Although aluminum itself is prone to forming an oxide layer in a humid environment, its oxidation rate and corrosion degree are greatly reduced under the protection of copper.
However, it is worth noting that at the connection point or joint, if it is not handled properly, aluminum and copper may corrode due to electrochemical reactions. This is because aluminum and copper have different electrochemical properties. They may form a galvanic cell in a humid or electrolyte environment, resulting in accelerated corrosion of aluminum. Therefore, when installing and maintaining CCA wires, appropriate measures need to be taken, such as using appropriate terminals and sealants, to ensure the stability of the connection point and the long-term reliability of the wire.
