Abstract:The side surface of copper-clad aluminum purple copper strip is not passivated, and thus is readily oxidated during production or storage, which affects the quality of subsequent cladding and welding. It not only causes that the copper layer and aluminum core of the copper clad aluminum wire produced cannot be firmly combined, and subsequent drawing is very easy to peel or fracture, wasting precious copper and aluminum metal materials, but also easily causes safety accidents in use. This paper discusses the causes of oxidation-induced discoloration on the side surface of copper-clad aluminum copper strip, and propose the preventive measures correspondingly from the perspective of the production process.