Pitting corrosion is relatively easy to appear on aluminum alloys in environments with chloride ions (Cl(superscript -)). Meanwhie, extrinsic cupric ions that contaminate the surfaces of aluminum alloys would lead to increases in corrosion rate. This study focuses on the effects of cupric ions on pitting corrosion of aluminum alloys. The corrosion rate of the tested alloy was determined by electrochemical noise analysis (ECN) and immersion test. Cross-sectional morphologies of pits and corrosion products were observed using optical microscope and scanning electron microscope. The results showed that the presence of cupric ions led to an increased corrosion current density of the alloy and the deposition of pure copper and the formation of pits on the surface. Possible mechanisms are discussed.