Anti-corrosion performance of aluminum alloy cable through metal loss test First, the aluminum alloy will quickly form a dense oxide film with a thickness of about 2×10-4mm in the air to prevent further corrosion of the internal metal. Copper can not form an oxide film, so the contaminants will stay on the surface and further inwardly corrode. After a period of corrosion, the rain will wash away, the oxides will be washed away, new pollutants will accumulate, and new metals will be re-corroded. There is no oxide film protection, which leads to rapid oxidation of copper and loss of metal. Secondly, because Cuba's climate is very hot and humid, when it is outdoors, the aluminum alloy is completely exposed to rainwater, and the rainwater will wash away pollutants and corrosives. If there is no rain to carry these pollutants away, these pollutants will be in contact with aluminum for a long time, and the pollutants are always corroded, resulting in more metal loss, so for aluminum, it will corrode more indoors than outdoors. However, even in the case of faster indoor losses, the loss of aluminum alloy is still much less than the loss of copper.